refactor: excel parse

server/venv/lib/python3.9/site-packages/grpc/_auth.py

@@ -0,0 +1,80 @@
+# Copyright 2016 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""GRPCAuthMetadataPlugins for standard authentication."""
+
+import inspect
+from typing import Any, Optional
+
+import grpc
+
+
+def _sign_request(
+    callback: grpc.AuthMetadataPluginCallback,
+    token: Optional[str],
+    error: Optional[Exception],
+):
+    metadata = (("authorization", "Bearer {}".format(token)),)
+    callback(metadata, error)
+
+
+class GoogleCallCredentials(grpc.AuthMetadataPlugin):
+    """Metadata wrapper for GoogleCredentials from the oauth2client library."""
+
+    _is_jwt: bool
+    _credentials: Any
+
+    # TODO(xuanwn): Give credentials an actual type.
+    def __init__(self, credentials: Any):
+        self._credentials = credentials
+        # Hack to determine if these are JWT creds and we need to pass # noqa: FIX004
+        # additional_claims when getting a token
+        self._is_jwt = (
+            "additional_claims"
+            in inspect.getfullargspec(credentials.get_access_token).args
+        )
+
+    def __call__(
+        self,
+        context: grpc.AuthMetadataContext,
+        callback: grpc.AuthMetadataPluginCallback,
+    ):
+        try:
+            if self._is_jwt:
+                access_token = self._credentials.get_access_token(
+                    additional_claims={
+                        "aud": context.service_url  # pytype: disable=attribute-error
+                    }
+                ).access_token
+            else:
+                access_token = self._credentials.get_access_token().access_token
+        except Exception as exception:  # pylint: disable=broad-except
+            _sign_request(callback, None, exception)
+        else:
+            _sign_request(callback, access_token, None)
+
+
+class AccessTokenAuthMetadataPlugin(grpc.AuthMetadataPlugin):
+    """Metadata wrapper for raw access token credentials."""
+
+    _access_token: str
+
+    def __init__(self, access_token: str):
+        self._access_token = access_token
+
+    def __call__(
+        self,
+        context: grpc.AuthMetadataContext,
+        callback: grpc.AuthMetadataPluginCallback,
+    ):
+        _sign_request(callback, self._access_token, None)

server/venv/lib/python3.9/site-packages/grpc/_common.py

@@ -0,0 +1,180 @@
+# Copyright 2016 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Shared implementation."""
+
+import logging
+import time
+from typing import Any, AnyStr, Callable, Optional, Union
+
+import grpc
+from grpc._cython import cygrpc
+from grpc._typing import DeserializingFunction
+from grpc._typing import SerializingFunction
+
+_LOGGER = logging.getLogger(__name__)
+
+CYGRPC_CONNECTIVITY_STATE_TO_CHANNEL_CONNECTIVITY = {
+    cygrpc.ConnectivityState.idle: grpc.ChannelConnectivity.IDLE,
+    cygrpc.ConnectivityState.connecting: grpc.ChannelConnectivity.CONNECTING,
+    cygrpc.ConnectivityState.ready: grpc.ChannelConnectivity.READY,
+    cygrpc.ConnectivityState.transient_failure: grpc.ChannelConnectivity.TRANSIENT_FAILURE,
+    cygrpc.ConnectivityState.shutdown: grpc.ChannelConnectivity.SHUTDOWN,
+}
+
+CYGRPC_STATUS_CODE_TO_STATUS_CODE = {
+    cygrpc.StatusCode.ok: grpc.StatusCode.OK,
+    cygrpc.StatusCode.cancelled: grpc.StatusCode.CANCELLED,
+    cygrpc.StatusCode.unknown: grpc.StatusCode.UNKNOWN,
+    cygrpc.StatusCode.invalid_argument: grpc.StatusCode.INVALID_ARGUMENT,
+    cygrpc.StatusCode.deadline_exceeded: grpc.StatusCode.DEADLINE_EXCEEDED,
+    cygrpc.StatusCode.not_found: grpc.StatusCode.NOT_FOUND,
+    cygrpc.StatusCode.already_exists: grpc.StatusCode.ALREADY_EXISTS,
+    cygrpc.StatusCode.permission_denied: grpc.StatusCode.PERMISSION_DENIED,
+    cygrpc.StatusCode.unauthenticated: grpc.StatusCode.UNAUTHENTICATED,
+    cygrpc.StatusCode.resource_exhausted: grpc.StatusCode.RESOURCE_EXHAUSTED,
+    cygrpc.StatusCode.failed_precondition: grpc.StatusCode.FAILED_PRECONDITION,
+    cygrpc.StatusCode.aborted: grpc.StatusCode.ABORTED,
+    cygrpc.StatusCode.out_of_range: grpc.StatusCode.OUT_OF_RANGE,
+    cygrpc.StatusCode.unimplemented: grpc.StatusCode.UNIMPLEMENTED,
+    cygrpc.StatusCode.internal: grpc.StatusCode.INTERNAL,
+    cygrpc.StatusCode.unavailable: grpc.StatusCode.UNAVAILABLE,
+    cygrpc.StatusCode.data_loss: grpc.StatusCode.DATA_LOSS,
+}
+STATUS_CODE_TO_CYGRPC_STATUS_CODE = {
+    grpc_code: cygrpc_code
+    for cygrpc_code, grpc_code in CYGRPC_STATUS_CODE_TO_STATUS_CODE.items()
+}
+
+MAXIMUM_WAIT_TIMEOUT = 0.1
+
+_ERROR_MESSAGE_PORT_BINDING_FAILED = (
+    "Failed to bind to address %s; set "
+    "GRPC_VERBOSITY=debug environment variable to see detailed error message."
+)
+
+
+def encode(s: AnyStr) -> bytes:
+    if isinstance(s, bytes):
+        return s
+    return s.encode("utf8")
+
+
+def decode(b: AnyStr) -> str:
+    if isinstance(b, bytes):
+        return b.decode("utf-8", "replace")
+    return b
+
+
+def _transform(
+    message: Any,
+    transformer: Union[SerializingFunction, DeserializingFunction, None],
+    exception_message: str,
+) -> Any:
+    if transformer is None:
+        return message
+    try:
+        return transformer(message)
+    except Exception:  # pylint: disable=broad-except
+        _LOGGER.exception(exception_message)
+        return None
+
+
+def serialize(message: Any, serializer: Optional[SerializingFunction]) -> bytes:
+    return _transform(message, serializer, "Exception serializing message!")
+
+
+def deserialize(
+    serialized_message: bytes, deserializer: Optional[DeserializingFunction]
+) -> Any:
+    return _transform(
+        serialized_message, deserializer, "Exception deserializing message!"
+    )
+
+
+def fully_qualified_method(group: str, method: str) -> str:
+    return "/{}/{}".format(group, method)
+
+
+def _wait_once(
+    wait_fn: Callable[..., bool],
+    timeout: float,
+    spin_cb: Optional[Callable[[], None]],
+):
+    wait_fn(timeout=timeout)
+    if spin_cb is not None:
+        spin_cb()
+
+
+def wait(
+    wait_fn: Callable[..., bool],
+    wait_complete_fn: Callable[[], bool],
+    timeout: Optional[float] = None,
+    spin_cb: Optional[Callable[[], None]] = None,
+) -> bool:
+    """Blocks waiting for an event without blocking the thread indefinitely.
+
+    See https://github.com/grpc/grpc/issues/19464 for full context. CPython's
+    `threading.Event.wait` and `threading.Condition.wait` methods, if invoked
+    without a timeout kwarg, may block the calling thread indefinitely. If the
+    call is made from the main thread, this means that signal handlers may not
+    run for an arbitrarily long period of time.
+
+    This wrapper calls the supplied wait function with an arbitrary short
+    timeout to ensure that no signal handler has to wait longer than
+    MAXIMUM_WAIT_TIMEOUT before executing.
+
+    Args:
+      wait_fn: A callable acceptable a single float-valued kwarg named
+        `timeout`. This function is expected to be one of `threading.Event.wait`
+        or `threading.Condition.wait`.
+      wait_complete_fn: A callable taking no arguments and returning a bool.
+        When this function returns true, it indicates that waiting should cease.
+      timeout: An optional float-valued number of seconds after which the wait
+        should cease.
+      spin_cb: An optional Callable taking no arguments and returning nothing.
+        This callback will be called on each iteration of the spin. This may be
+        used for, e.g. work related to forking.
+
+    Returns:
+      True if a timeout was supplied and it was reached. False otherwise.
+    """
+    if timeout is None:
+        while not wait_complete_fn():
+            _wait_once(wait_fn, MAXIMUM_WAIT_TIMEOUT, spin_cb)
+    else:
+        end = time.time() + timeout
+        while not wait_complete_fn():
+            remaining = min(end - time.time(), MAXIMUM_WAIT_TIMEOUT)
+            if remaining < 0:
+                return True
+            _wait_once(wait_fn, remaining, spin_cb)
+    return False
+
+
+def validate_port_binding_result(address: str, port: int) -> int:
+    """Validates if the port binding succeed.
+
+    If the port returned by Core is 0, the binding is failed. However, in that
+    case, the Core API doesn't return a detailed failing reason. The best we
+    can do is raising an exception to prevent further confusion.
+
+    Args:
+        address: The address string to be bound.
+        port: An int returned by core
+    """
+    if port == 0:
+        # The Core API doesn't return a failure message. The best we can do
+        # is raising an exception to prevent further confusion.
+        raise RuntimeError(_ERROR_MESSAGE_PORT_BINDING_FAILED % address)
+    return port

server/venv/lib/python3.9/site-packages/grpc/_compression.py

@@ -0,0 +1,71 @@
+# Copyright 2019 The gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import annotations
+
+from typing import Optional
+
+import grpc
+from grpc._cython import cygrpc
+from grpc._typing import MetadataType
+
+NoCompression = cygrpc.CompressionAlgorithm.none
+Deflate = cygrpc.CompressionAlgorithm.deflate
+Gzip = cygrpc.CompressionAlgorithm.gzip
+
+_METADATA_STRING_MAPPING = {
+    NoCompression: "identity",
+    Deflate: "deflate",
+    Gzip: "gzip",
+}
+
+
+def _compression_algorithm_to_metadata_value(
+    compression: grpc.Compression,
+) -> str:
+    return _METADATA_STRING_MAPPING[compression]
+
+
+def compression_algorithm_to_metadata(compression: grpc.Compression):
+    return (
+        cygrpc.GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY,
+        _compression_algorithm_to_metadata_value(compression),
+    )
+
+
+def create_channel_option(compression: Optional[grpc.Compression]):
+    return (
+        ((cygrpc.GRPC_COMPRESSION_CHANNEL_DEFAULT_ALGORITHM, int(compression)),)
+        if compression
+        else ()
+    )
+
+
+def augment_metadata(
+    metadata: Optional[MetadataType], compression: Optional[grpc.Compression]
+):
+    if not metadata and not compression:
+        return None
+    base_metadata = tuple(metadata) if metadata else ()
+    compression_metadata = (
+        (compression_algorithm_to_metadata(compression),) if compression else ()
+    )
+    return base_metadata + compression_metadata
+
+
+__all__ = (
+    "Deflate",
+    "Gzip",
+    "NoCompression",
+)

server/venv/lib/python3.9/site-packages/grpc/_cython/__init__.py

@@ -0,0 +1,13 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

server/venv/lib/python3.9/site-packages/grpc/_cython/_cygrpc/__init__.py

@@ -0,0 +1,13 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

server/venv/lib/python3.9/site-packages/grpc/_cython/_cygrpc/private_key_signing/private_key_signer_py_wrapper.cc

@@ -0,0 +1,100 @@
+//
+//
+// Copyright 2026 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+//
+
+#include "src/python/grpcio/grpc/_cython/_cygrpc/private_key_signing/private_key_signer_py_wrapper.h"
+
+#include <grpc/support/log.h>
+
+#include <memory>
+
+#include "Python.h"
+#include "grpc/private_key_signer.h"
+#include "absl/status/status.h"
+
+namespace grpc_python {
+
+std::shared_ptr<grpc_core::PrivateKeySigner> PrivateKeySignerPyWrapper::Create(
+    PrivateKeySignerPyWrapper::SignWrapperForPy sign_py_wrapper,
+    PyObject* py_user_sign_fn, PyObject* destroy_event) {
+  PyGILState_STATE state = PyGILState_Ensure();
+  Py_INCREF(py_user_sign_fn);
+  Py_INCREF(destroy_event);
+  PyGILState_Release(state);
+  return std::make_shared<PrivateKeySignerPyWrapper>(
+      sign_py_wrapper, py_user_sign_fn, destroy_event);
+}
+
+PrivateKeySignerPyWrapper::~PrivateKeySignerPyWrapper() {
+  PyGILState_STATE state = PyGILState_Ensure();
+  Py_DECREF(static_cast<PyObject*>(py_user_sign_fn_));
+  // Python will stay alive until this event is set
+  PyObject* result = PyObject_CallMethod(destroy_event_, "set", "()");
+  // crash if result is nullptr? - discussing
+  Py_XDECREF(result);
+  PyGILState_Release(state);
+}
+
+std::variant<absl::StatusOr<std::string>,
+             std::shared_ptr<grpc_core::PrivateKeySigner::AsyncSigningHandle>>
+PrivateKeySignerPyWrapper::Sign(absl::string_view data_to_sign,
+                                SignatureAlgorithm signature_algorithm,
+                                OnSignComplete on_sign_complete) {
+  auto completion_context =
+      std::make_shared<CompletionContext>(std::move(on_sign_complete));
+
+  PrivateKeySignerPyWrapperResult result = sign_py_wrapper_(
+      data_to_sign, signature_algorithm, py_user_sign_fn_, completion_context);
+  if (result.is_sync) {
+    return result.sync_result;
+  } else {
+    auto handle = std::make_shared<AsyncSigningHandlePyWrapper>(
+        result.async_result.cancel_wrapper,
+        result.async_result.py_user_cancel_fn, std::move(completion_context));
+    return handle;
+  }
+}
+
+void PrivateKeySignerPyWrapper::Cancel(
+    std::shared_ptr<AsyncSigningHandle> handle) {
+  if (handle == nullptr) return;
+  auto handle_impl =
+      std::static_pointer_cast<AsyncSigningHandlePyWrapper>(handle);
+  handle_impl->Cancel();
+}
+
+PrivateKeySignerPyWrapper::AsyncSigningHandlePyWrapper::
+    ~AsyncSigningHandlePyWrapper() {
+  PyGILState_STATE state = PyGILState_Ensure();
+  Py_DECREF(py_user_cancel_fn_);
+  PyGILState_Release(state);
+}
+
+void PrivateKeySignerPyWrapper::AsyncSigningHandlePyWrapper::Cancel() {
+  if (cancel_py_wrapper_ != nullptr && py_user_cancel_fn_ != nullptr) {
+    cancel_py_wrapper_(py_user_cancel_fn_);
+  }
+  completion_context_.reset();
+}
+
+std::string MakeStringForCython(const char* inp, size_t size) {
+  return std::string(inp, size);
+}
+
+std::string MakeStringForCython(const char* inp) { return std::string(inp); }
+
+}  // namespace grpc_python

server/venv/lib/python3.9/site-packages/grpc/_cython/_cygrpc/private_key_signing/private_key_signer_py_wrapper.h

@@ -0,0 +1,143 @@
+//
+//
+// Copyright 2026 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+//
+
+#ifndef GRPC_PRIVATE_KEY_SIGNER_PY_WRAPPER_H
+#define GRPC_PRIVATE_KEY_SIGNER_PY_WRAPPER_H
+
+#include <memory>
+#include <string>
+#include <variant>
+
+#include "Python.h"
+#include "grpc/private_key_signer.h"
+#include "absl/status/statusor.h"
+
+namespace grpc_python {
+
+// An implementation of PrivateKeySigner for interop with Python.
+// It is thread-safe to call Sign on this class.
+class PrivateKeySignerPyWrapper final
+    : public grpc_core::PrivateKeySigner,
+      public std::enable_shared_from_this<PrivateKeySignerPyWrapper> {
+ public:
+  // A C-style callback for the PrivateKeySigner Cancel function.
+  typedef void (*CancelWrapperForPy)(PyObject* cancel_data);
+
+  // A wrapper for holding the user's Python cancellation function as well as
+  // the C callback that can call that function.
+  struct AsyncResult {
+    CancelWrapperForPy cancel_wrapper;
+    PyObject* py_user_cancel_fn;
+  };
+
+  // The result of the sign call for interop between Cython and C. Is converted
+  // to the C++ std::variant Sign result.
+  struct PrivateKeySignerPyWrapperResult {
+    absl::StatusOr<std::string> sync_result;
+    AsyncResult async_result;
+    bool is_sync;
+  };
+
+  // The context needed for calling the Completion callback at the Cython layer.
+  // Wrapped in regular Python and passed to the user for them to be able to
+  // call the proper on_complete callback passed out by gRPC Core.
+  class CompletionContext final {
+   public:
+    explicit CompletionContext(
+        grpc_core::PrivateKeySigner::OnSignComplete on_complete)
+        : on_complete_(std::move(on_complete)) {}
+    void OnComplete(absl::StatusOr<std::string> result) {
+      on_complete_(std::move(result));
+    };
+
+   private:
+    // Holds the completion function passed out by gRPC Core.
+    grpc_core::PrivateKeySigner::OnSignComplete on_complete_;
+  };
+
+  // A C-Style function for the Cython layer to call when the gRPC C++ layer
+  // calls `Sign` on the `PrivateKeySignerPyWrapper`.
+  typedef PrivateKeySignerPyWrapperResult (*SignWrapperForPy)(
+      absl::string_view data_to_sign,
+      grpc_core::PrivateKeySigner::SignatureAlgorithm signature_algorithm,
+      PyObject* py_user_sign_fn,
+      std::weak_ptr<CompletionContext> completion_context);
+
+  class AsyncSigningHandlePyWrapper
+      : public grpc_core::PrivateKeySigner::AsyncSigningHandle {
+   public:
+    AsyncSigningHandlePyWrapper(
+        PrivateKeySignerPyWrapper::CancelWrapperForPy cancel_py_wrapper,
+        PyObject* py_user_cancel_fn,
+        std::shared_ptr<PrivateKeySignerPyWrapper::CompletionContext>
+            completion_context)
+        : cancel_py_wrapper_(cancel_py_wrapper),
+          py_user_cancel_fn_(py_user_cancel_fn),
+          completion_context_(std::move(completion_context)) {}
+    // This will decrememnt the py_user_cancel_fn on object destruction
+    ~AsyncSigningHandlePyWrapper() override;
+    void Cancel();
+
+   private:
+    // This is a function provided by the Cython implementation of Private Key
+    // Offloading.
+    PrivateKeySignerPyWrapper::CancelWrapperForPy cancel_py_wrapper_;
+    // This will hold the Python callable object
+    PyObject* py_user_cancel_fn_;
+    std::shared_ptr<PrivateKeySignerPyWrapper::CompletionContext>
+        completion_context_;
+  };
+
+  // The entry point for Cython to build a PrivateKeySigner.
+  static std::shared_ptr<grpc_core::PrivateKeySigner> Create(
+      SignWrapperForPy sign, PyObject* py_user_sign_fn,
+      PyObject* destroy_event);
+
+  PrivateKeySignerPyWrapper(SignWrapperForPy sign_py_wrapper,
+                            PyObject* py_user_sign_fn, PyObject* destroy_event)
+      : sign_py_wrapper_(sign_py_wrapper),
+        py_user_sign_fn_(py_user_sign_fn),
+        destroy_event_(destroy_event) {}
+  ~PrivateKeySignerPyWrapper() override;
+
+  std::variant<absl::StatusOr<std::string>, std::shared_ptr<AsyncSigningHandle>>
+  Sign(absl::string_view data_to_sign, SignatureAlgorithm signature_algorithm,
+       OnSignComplete on_sign_complete) override;
+
+  void Cancel(std::shared_ptr<AsyncSigningHandle> handle) override;
+
+ private:
+  // This is a function provided by the Cython implementation of Private Key
+  // Offloading.
+  SignWrapperForPy sign_py_wrapper_;
+  // This will hold the Python callable object
+  PyObject* py_user_sign_fn_;
+  // An event to make sure the python interpreter stays alive until this
+  // destruction is complete
+  PyObject* destroy_event_;
+};
+
+// Python cannot call the string constructor directly in Cython. The string
+// constructor can throw exceptions, so the generated C code from Cython
+// contains try/catch statements. This fails our strict builds. Instead, we can
+// just construct them here and pass them down.
+std::string MakeStringForCython(const char* inp);
+std::string MakeStringForCython(const char* inp, size_t size);
+}  // namespace grpc_python
+
+#endif  // GRPC_PRIVATE_KEY_SIGNER_PY_WRAPPER_H

server/venv/lib/python3.9/site-packages/grpc/_grpcio_metadata.py

@@ -0,0 +1 @@
+__version__ = """1.80.0"""

server/venv/lib/python3.9/site-packages/grpc/_interceptor.py

@@ -0,0 +1,809 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Implementation of gRPC Python interceptors."""
+
+import collections
+import sys
+import types
+from typing import Any, Callable, Optional, Sequence, Tuple, Union
+
+import grpc
+
+from ._typing import DeserializingFunction
+from ._typing import DoneCallbackType
+from ._typing import MetadataType
+from ._typing import RequestIterableType
+from ._typing import SerializingFunction
+
+
+class _ServicePipeline(object):
+    interceptors: Tuple[grpc.ServerInterceptor]
+
+    def __init__(self, interceptors: Sequence[grpc.ServerInterceptor]):
+        self.interceptors = tuple(interceptors)
+
+    def _continuation(self, thunk: Callable, index: int) -> Callable:
+        return lambda context: self._intercept_at(thunk, index, context)
+
+    def _intercept_at(
+        self, thunk: Callable, index: int, context: grpc.HandlerCallDetails
+    ) -> grpc.RpcMethodHandler:
+        if index < len(self.interceptors):
+            interceptor = self.interceptors[index]
+            thunk = self._continuation(thunk, index + 1)
+            return interceptor.intercept_service(thunk, context)
+        return thunk(context)
+
+    def execute(
+        self, thunk: Callable, context: grpc.HandlerCallDetails
+    ) -> grpc.RpcMethodHandler:
+        return self._intercept_at(thunk, 0, context)
+
+
+def service_pipeline(
+    interceptors: Optional[Sequence[grpc.ServerInterceptor]],
+) -> Optional[_ServicePipeline]:
+    return _ServicePipeline(interceptors) if interceptors else None
+
+
+class _ClientCallDetails(
+    collections.namedtuple(
+        "_ClientCallDetails",
+        (
+            "method",
+            "timeout",
+            "metadata",
+            "credentials",
+            "wait_for_ready",
+            "compression",
+        ),
+    ),
+    grpc.ClientCallDetails,
+):
+    pass
+
+
+def _unwrap_client_call_details(
+    call_details: grpc.ClientCallDetails,
+    default_details: grpc.ClientCallDetails,
+) -> Tuple[
+    str, float, MetadataType, grpc.CallCredentials, bool, grpc.Compression
+]:
+    try:
+        method = call_details.method  # pytype: disable=attribute-error
+    except AttributeError:
+        method = default_details.method  # pytype: disable=attribute-error
+
+    try:
+        timeout = call_details.timeout  # pytype: disable=attribute-error
+    except AttributeError:
+        timeout = default_details.timeout  # pytype: disable=attribute-error
+
+    try:
+        metadata = call_details.metadata  # pytype: disable=attribute-error
+    except AttributeError:
+        metadata = default_details.metadata  # pytype: disable=attribute-error
+
+    try:
+        credentials = (
+            call_details.credentials
+        )  # pytype: disable=attribute-error
+    except AttributeError:
+        credentials = (
+            default_details.credentials
+        )  # pytype: disable=attribute-error
+
+    try:
+        wait_for_ready = (
+            call_details.wait_for_ready
+        )  # pytype: disable=attribute-error
+    except AttributeError:
+        wait_for_ready = (
+            default_details.wait_for_ready
+        )  # pytype: disable=attribute-error
+
+    try:
+        compression = (
+            call_details.compression
+        )  # pytype: disable=attribute-error
+    except AttributeError:
+        compression = (
+            default_details.compression
+        )  # pytype: disable=attribute-error
+
+    return method, timeout, metadata, credentials, wait_for_ready, compression
+
+
+class _FailureOutcome(
+    grpc.RpcError, grpc.Future, grpc.Call
+):  # pylint: disable=too-many-ancestors
+    _exception: Exception
+    _traceback: types.TracebackType
+
+    def __init__(self, exception: Exception, traceback: types.TracebackType):
+        super(_FailureOutcome, self).__init__()
+        self._exception = exception
+        self._traceback = traceback
+
+    def initial_metadata(self) -> Optional[MetadataType]:
+        return None
+
+    def trailing_metadata(self) -> Optional[MetadataType]:
+        return None
+
+    def code(self) -> Optional[grpc.StatusCode]:
+        return grpc.StatusCode.INTERNAL
+
+    def details(self) -> Optional[str]:
+        return "Exception raised while intercepting the RPC"
+
+    def cancel(self) -> bool:
+        return False
+
+    def cancelled(self) -> bool:
+        return False
+
+    def is_active(self) -> bool:
+        return False
+
+    def time_remaining(self) -> Optional[float]:
+        return None
+
+    def running(self) -> bool:
+        return False
+
+    def done(self) -> bool:
+        return True
+
+    def result(self, ignored_timeout: Optional[float] = None):
+        raise self._exception
+
+    def exception(
+        self, ignored_timeout: Optional[float] = None
+    ) -> Optional[Exception]:
+        return self._exception
+
+    def traceback(
+        self, ignored_timeout: Optional[float] = None
+    ) -> Optional[types.TracebackType]:
+        return self._traceback
+
+    def add_callback(self, unused_callback) -> bool:
+        return False
+
+    def add_done_callback(self, fn: DoneCallbackType) -> None:
+        fn(self)
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        raise self._exception
+
+    def next(self):
+        return self.__next__()
+
+
+class _UnaryOutcome(grpc.Call, grpc.Future):
+    _response: Any
+    _call: grpc.Call
+
+    def __init__(self, response: Any, call: grpc.Call):
+        self._response = response
+        self._call = call
+
+    def initial_metadata(self) -> Optional[MetadataType]:
+        return self._call.initial_metadata()
+
+    def trailing_metadata(self) -> Optional[MetadataType]:
+        return self._call.trailing_metadata()
+
+    def code(self) -> Optional[grpc.StatusCode]:
+        return self._call.code()
+
+    def details(self) -> Optional[str]:
+        return self._call.details()
+
+    def is_active(self) -> bool:
+        return self._call.is_active()
+
+    def time_remaining(self) -> Optional[float]:
+        return self._call.time_remaining()
+
+    def cancel(self) -> bool:
+        return self._call.cancel()
+
+    def add_callback(self, callback) -> bool:
+        return self._call.add_callback(callback)
+
+    def cancelled(self) -> bool:
+        return False
+
+    def running(self) -> bool:
+        return False
+
+    def done(self) -> bool:
+        return True
+
+    def result(self, ignored_timeout: Optional[float] = None):
+        return self._response
+
+    def exception(self, ignored_timeout: Optional[float] = None):
+        return None
+
+    def traceback(self, ignored_timeout: Optional[float] = None):
+        return None
+
+    def add_done_callback(self, fn: DoneCallbackType) -> None:
+        fn(self)
+
+
+class _UnaryUnaryMultiCallable(grpc.UnaryUnaryMultiCallable):
+    _thunk: Callable
+    _method: str
+    _interceptor: grpc.UnaryUnaryClientInterceptor
+
+    def __init__(
+        self,
+        thunk: Callable,
+        method: str,
+        interceptor: grpc.UnaryUnaryClientInterceptor,
+    ):
+        self._thunk = thunk
+        self._method = method
+        self._interceptor = interceptor
+
+    def __call__(
+        self,
+        request: Any,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> Any:
+        response, ignored_call = self._with_call(
+            request,
+            timeout=timeout,
+            metadata=metadata,
+            credentials=credentials,
+            wait_for_ready=wait_for_ready,
+            compression=compression,
+        )
+        return response
+
+    def _with_call(
+        self,
+        request: Any,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> Tuple[Any, grpc.Call]:
+        client_call_details = _ClientCallDetails(
+            self._method,
+            timeout,
+            metadata,
+            credentials,
+            wait_for_ready,
+            compression,
+        )
+
+        def continuation(new_details, request):
+            (
+                new_method,
+                new_timeout,
+                new_metadata,
+                new_credentials,
+                new_wait_for_ready,
+                new_compression,
+            ) = _unwrap_client_call_details(new_details, client_call_details)
+            try:
+                response, call = self._thunk(new_method).with_call(
+                    request,
+                    timeout=new_timeout,
+                    metadata=new_metadata,
+                    credentials=new_credentials,
+                    wait_for_ready=new_wait_for_ready,
+                    compression=new_compression,
+                )
+                return _UnaryOutcome(response, call)
+            except grpc.RpcError as rpc_error:
+                return rpc_error
+            except Exception as exception:  # pylint:disable=broad-except
+                return _FailureOutcome(exception, sys.exc_info()[2])
+
+        call = self._interceptor.intercept_unary_unary(
+            continuation, client_call_details, request
+        )
+        return call.result(), call
+
+    def with_call(
+        self,
+        request: Any,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> Tuple[Any, grpc.Call]:
+        return self._with_call(
+            request,
+            timeout=timeout,
+            metadata=metadata,
+            credentials=credentials,
+            wait_for_ready=wait_for_ready,
+            compression=compression,
+        )
+
+    def future(
+        self,
+        request: Any,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> Any:
+        client_call_details = _ClientCallDetails(
+            self._method,
+            timeout,
+            metadata,
+            credentials,
+            wait_for_ready,
+            compression,
+        )
+
+        def continuation(new_details, request):
+            (
+                new_method,
+                new_timeout,
+                new_metadata,
+                new_credentials,
+                new_wait_for_ready,
+                new_compression,
+            ) = _unwrap_client_call_details(new_details, client_call_details)
+            return self._thunk(new_method).future(
+                request,
+                timeout=new_timeout,
+                metadata=new_metadata,
+                credentials=new_credentials,
+                wait_for_ready=new_wait_for_ready,
+                compression=new_compression,
+            )
+
+        try:
+            return self._interceptor.intercept_unary_unary(
+                continuation, client_call_details, request
+            )
+        except Exception as exception:  # pylint:disable=broad-except
+            return _FailureOutcome(exception, sys.exc_info()[2])
+
+
+class _UnaryStreamMultiCallable(grpc.UnaryStreamMultiCallable):
+    _thunk: Callable
+    _method: str
+    _interceptor: grpc.UnaryStreamClientInterceptor
+
+    def __init__(
+        self,
+        thunk: Callable,
+        method: str,
+        interceptor: grpc.UnaryStreamClientInterceptor,
+    ):
+        self._thunk = thunk
+        self._method = method
+        self._interceptor = interceptor
+
+    def __call__(
+        self,
+        request: Any,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ):
+        client_call_details = _ClientCallDetails(
+            self._method,
+            timeout,
+            metadata,
+            credentials,
+            wait_for_ready,
+            compression,
+        )
+
+        def continuation(new_details, request):
+            (
+                new_method,
+                new_timeout,
+                new_metadata,
+                new_credentials,
+                new_wait_for_ready,
+                new_compression,
+            ) = _unwrap_client_call_details(new_details, client_call_details)
+            return self._thunk(new_method)(
+                request,
+                timeout=new_timeout,
+                metadata=new_metadata,
+                credentials=new_credentials,
+                wait_for_ready=new_wait_for_ready,
+                compression=new_compression,
+            )
+
+        try:
+            return self._interceptor.intercept_unary_stream(
+                continuation, client_call_details, request
+            )
+        except Exception as exception:  # pylint:disable=broad-except
+            return _FailureOutcome(exception, sys.exc_info()[2])
+
+
+class _StreamUnaryMultiCallable(grpc.StreamUnaryMultiCallable):
+    _thunk: Callable
+    _method: str
+    _interceptor: grpc.StreamUnaryClientInterceptor
+
+    def __init__(
+        self,
+        thunk: Callable,
+        method: str,
+        interceptor: grpc.StreamUnaryClientInterceptor,
+    ):
+        self._thunk = thunk
+        self._method = method
+        self._interceptor = interceptor
+
+    def __call__(
+        self,
+        request_iterator: RequestIterableType,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> Any:
+        response, ignored_call = self._with_call(
+            request_iterator,
+            timeout=timeout,
+            metadata=metadata,
+            credentials=credentials,
+            wait_for_ready=wait_for_ready,
+            compression=compression,
+        )
+        return response
+
+    def _with_call(
+        self,
+        request_iterator: RequestIterableType,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> Tuple[Any, grpc.Call]:
+        client_call_details = _ClientCallDetails(
+            self._method,
+            timeout,
+            metadata,
+            credentials,
+            wait_for_ready,
+            compression,
+        )
+
+        def continuation(new_details, request_iterator):
+            (
+                new_method,
+                new_timeout,
+                new_metadata,
+                new_credentials,
+                new_wait_for_ready,
+                new_compression,
+            ) = _unwrap_client_call_details(new_details, client_call_details)
+            try:
+                response, call = self._thunk(new_method).with_call(
+                    request_iterator,
+                    timeout=new_timeout,
+                    metadata=new_metadata,
+                    credentials=new_credentials,
+                    wait_for_ready=new_wait_for_ready,
+                    compression=new_compression,
+                )
+                return _UnaryOutcome(response, call)
+            except grpc.RpcError as rpc_error:
+                return rpc_error
+            except Exception as exception:  # pylint:disable=broad-except
+                return _FailureOutcome(exception, sys.exc_info()[2])
+
+        call = self._interceptor.intercept_stream_unary(
+            continuation, client_call_details, request_iterator
+        )
+        return call.result(), call
+
+    def with_call(
+        self,
+        request_iterator: RequestIterableType,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> Tuple[Any, grpc.Call]:
+        return self._with_call(
+            request_iterator,
+            timeout=timeout,
+            metadata=metadata,
+            credentials=credentials,
+            wait_for_ready=wait_for_ready,
+            compression=compression,
+        )
+
+    def future(
+        self,
+        request_iterator: RequestIterableType,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> Any:
+        client_call_details = _ClientCallDetails(
+            self._method,
+            timeout,
+            metadata,
+            credentials,
+            wait_for_ready,
+            compression,
+        )
+
+        def continuation(new_details, request_iterator):
+            (
+                new_method,
+                new_timeout,
+                new_metadata,
+                new_credentials,
+                new_wait_for_ready,
+                new_compression,
+            ) = _unwrap_client_call_details(new_details, client_call_details)
+            return self._thunk(new_method).future(
+                request_iterator,
+                timeout=new_timeout,
+                metadata=new_metadata,
+                credentials=new_credentials,
+                wait_for_ready=new_wait_for_ready,
+                compression=new_compression,
+            )
+
+        try:
+            return self._interceptor.intercept_stream_unary(
+                continuation, client_call_details, request_iterator
+            )
+        except Exception as exception:  # pylint:disable=broad-except
+            return _FailureOutcome(exception, sys.exc_info()[2])
+
+
+class _StreamStreamMultiCallable(grpc.StreamStreamMultiCallable):
+    _thunk: Callable
+    _method: str
+    _interceptor: grpc.StreamStreamClientInterceptor
+
+    def __init__(
+        self,
+        thunk: Callable,
+        method: str,
+        interceptor: grpc.StreamStreamClientInterceptor,
+    ):
+        self._thunk = thunk
+        self._method = method
+        self._interceptor = interceptor
+
+    def __call__(
+        self,
+        request_iterator: RequestIterableType,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ):
+        client_call_details = _ClientCallDetails(
+            self._method,
+            timeout,
+            metadata,
+            credentials,
+            wait_for_ready,
+            compression,
+        )
+
+        def continuation(new_details, request_iterator):
+            (
+                new_method,
+                new_timeout,
+                new_metadata,
+                new_credentials,
+                new_wait_for_ready,
+                new_compression,
+            ) = _unwrap_client_call_details(new_details, client_call_details)
+            return self._thunk(new_method)(
+                request_iterator,
+                timeout=new_timeout,
+                metadata=new_metadata,
+                credentials=new_credentials,
+                wait_for_ready=new_wait_for_ready,
+                compression=new_compression,
+            )
+
+        try:
+            return self._interceptor.intercept_stream_stream(
+                continuation, client_call_details, request_iterator
+            )
+        except Exception as exception:  # pylint:disable=broad-except
+            return _FailureOutcome(exception, sys.exc_info()[2])
+
+
+class _Channel(grpc.Channel):
+    _channel: grpc.Channel
+    _interceptor: Union[
+        grpc.UnaryUnaryClientInterceptor,
+        grpc.UnaryStreamClientInterceptor,
+        grpc.StreamStreamClientInterceptor,
+        grpc.StreamUnaryClientInterceptor,
+    ]
+
+    def __init__(
+        self,
+        channel: grpc.Channel,
+        interceptor: Union[
+            grpc.UnaryUnaryClientInterceptor,
+            grpc.UnaryStreamClientInterceptor,
+            grpc.StreamStreamClientInterceptor,
+            grpc.StreamUnaryClientInterceptor,
+        ],
+    ):
+        self._channel = channel
+        self._interceptor = interceptor
+
+    def subscribe(
+        self, callback: Callable, try_to_connect: Optional[bool] = False
+    ):
+        self._channel.subscribe(callback, try_to_connect=try_to_connect)
+
+    def unsubscribe(self, callback: Callable):
+        self._channel.unsubscribe(callback)
+
+    # pylint: disable=arguments-differ
+    def unary_unary(
+        self,
+        method: str,
+        request_serializer: Optional[SerializingFunction] = None,
+        response_deserializer: Optional[DeserializingFunction] = None,
+        _registered_method: Optional[bool] = False,
+    ) -> grpc.UnaryUnaryMultiCallable:
+        # pytype: disable=wrong-arg-count
+        thunk = lambda m: self._channel.unary_unary(
+            m,
+            request_serializer,
+            response_deserializer,
+            _registered_method,
+        )
+        # pytype: enable=wrong-arg-count
+        if isinstance(self._interceptor, grpc.UnaryUnaryClientInterceptor):
+            return _UnaryUnaryMultiCallable(thunk, method, self._interceptor)
+        return thunk(method)
+
+    # pylint: disable=arguments-differ
+    def unary_stream(
+        self,
+        method: str,
+        request_serializer: Optional[SerializingFunction] = None,
+        response_deserializer: Optional[DeserializingFunction] = None,
+        _registered_method: Optional[bool] = False,
+    ) -> grpc.UnaryStreamMultiCallable:
+        # pytype: disable=wrong-arg-count
+        thunk = lambda m: self._channel.unary_stream(
+            m,
+            request_serializer,
+            response_deserializer,
+            _registered_method,
+        )
+        # pytype: enable=wrong-arg-count
+        if isinstance(self._interceptor, grpc.UnaryStreamClientInterceptor):
+            return _UnaryStreamMultiCallable(thunk, method, self._interceptor)
+        return thunk(method)
+
+    # pylint: disable=arguments-differ
+    def stream_unary(
+        self,
+        method: str,
+        request_serializer: Optional[SerializingFunction] = None,
+        response_deserializer: Optional[DeserializingFunction] = None,
+        _registered_method: Optional[bool] = False,
+    ) -> grpc.StreamUnaryMultiCallable:
+        # pytype: disable=wrong-arg-count
+        thunk = lambda m: self._channel.stream_unary(
+            m,
+            request_serializer,
+            response_deserializer,
+            _registered_method,
+        )
+        # pytype: enable=wrong-arg-count
+        if isinstance(self._interceptor, grpc.StreamUnaryClientInterceptor):
+            return _StreamUnaryMultiCallable(thunk, method, self._interceptor)
+        return thunk(method)
+
+    # pylint: disable=arguments-differ
+    def stream_stream(
+        self,
+        method: str,
+        request_serializer: Optional[SerializingFunction] = None,
+        response_deserializer: Optional[DeserializingFunction] = None,
+        _registered_method: Optional[bool] = False,
+    ) -> grpc.StreamStreamMultiCallable:
+        # pytype: disable=wrong-arg-count
+        thunk = lambda m: self._channel.stream_stream(
+            m,
+            request_serializer,
+            response_deserializer,
+            _registered_method,
+        )
+        # pytype: enable=wrong-arg-count
+        if isinstance(self._interceptor, grpc.StreamStreamClientInterceptor):
+            return _StreamStreamMultiCallable(thunk, method, self._interceptor)
+        return thunk(method)
+
+    def _close(self):
+        self._channel.close()
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self._close()
+        return False
+
+    def close(self):
+        self._channel.close()
+
+
+def intercept_channel(
+    channel: grpc.Channel,
+    *interceptors: Optional[
+        Sequence[
+            Union[
+                grpc.UnaryUnaryClientInterceptor,
+                grpc.UnaryStreamClientInterceptor,
+                grpc.StreamStreamClientInterceptor,
+                grpc.StreamUnaryClientInterceptor,
+            ]
+        ]
+    ],
+) -> grpc.Channel:
+    for interceptor in reversed(list(interceptors)):
+        if (
+            not isinstance(interceptor, grpc.UnaryUnaryClientInterceptor)
+            and not isinstance(interceptor, grpc.UnaryStreamClientInterceptor)
+            and not isinstance(interceptor, grpc.StreamUnaryClientInterceptor)
+            and not isinstance(interceptor, grpc.StreamStreamClientInterceptor)
+        ):
+            error_msg = (
+                "interceptor must be "
+                "grpc.UnaryUnaryClientInterceptor or "
+                "grpc.UnaryStreamClientInterceptor or "
+                "grpc.StreamUnaryClientInterceptor or "
+                "grpc.StreamStreamClientInterceptor"
+            )
+            raise TypeError(error_msg)
+        channel = _Channel(channel, interceptor)
+    return channel

server/venv/lib/python3.9/site-packages/grpc/_observability.py

@@ -0,0 +1,312 @@
+# Copyright 2023 The gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import annotations
+
+import abc
+import contextlib
+import logging
+import threading
+from typing import (
+    Any,
+    Generator,
+    Generic,
+    List,
+    Optional,
+    Tuple,
+    TypeVar,
+    Union,
+)
+
+from grpc._cython import cygrpc as _cygrpc
+from grpc._typing import ChannelArgumentType
+
+_LOGGER = logging.getLogger(__name__)
+
+_channel = Any  # _channel.py imports this module.
+ClientCallTracerCapsule = TypeVar("ClientCallTracerCapsule")
+ServerCallTracerFactoryCapsule = TypeVar("ServerCallTracerFactoryCapsule")
+
+_plugin_lock: threading.RLock = threading.RLock()
+_OBSERVABILITY_PLUGIN: Optional["ObservabilityPlugin"] = None
+_SERVICES_TO_EXCLUDE: List[bytes] = [
+    b"google.monitoring.v3.MetricService",
+    b"google.devtools.cloudtrace.v2.TraceService",
+]
+
+
+class ServerCallTracerFactory:
+    """An encapsulation of a ServerCallTracerFactory.
+
+    Instances of this class can be passed to a Channel as values for the
+    grpc.experimental.server_call_tracer_factory option
+    """
+
+    def __init__(self, address):
+        self._address = address
+
+    def __int__(self):
+        return self._address
+
+
+class ObservabilityPlugin(
+    Generic[ClientCallTracerCapsule, ServerCallTracerFactoryCapsule],
+    metaclass=abc.ABCMeta,
+):
+    """Abstract base class for observability plugin.
+
+    *This is a semi-private class that was intended for the exclusive use of
+     the gRPC team.*
+
+    The ClientCallTracerCapsule and ClientCallTracerCapsule created by this
+    plugin should be injected to gRPC core using observability_init at the
+    start of a program, before any channels/servers are built.
+
+    Any future methods added to this interface cannot have the
+    @abc.abstractmethod annotation.
+
+    Attributes:
+      _stats_enabled: A bool indicates whether tracing is enabled.
+      _tracing_enabled: A bool indicates whether stats(metrics) is enabled.
+      _registered_methods: A set which stores the registered method names in
+        bytes.
+    """
+
+    _tracing_enabled: bool = False
+    _stats_enabled: bool = False
+
+    @abc.abstractmethod
+    def create_client_call_tracer(
+        self, method_name: bytes, target: bytes
+    ) -> ClientCallTracerCapsule:
+        """Creates a ClientCallTracerCapsule.
+
+        After register the plugin, if tracing or stats is enabled, this method
+        will be called after a call was created, the ClientCallTracer created
+        by this method will be saved to call context.
+
+        The ClientCallTracer is an object which implements `grpc_core::ClientCallTracer`
+        interface and wrapped in a PyCapsule using `client_call_tracer` as name.
+
+        Args:
+          method_name: The method name of the call in byte format.
+          target: The channel target of the call in byte format.
+          registered_method: Whether this method is pre-registered.
+
+        Returns:
+          A PyCapsule which stores a ClientCallTracer object.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def save_trace_context(
+        self, trace_id: str, span_id: str, is_sampled: bool
+    ) -> None:
+        """Saves the trace_id and span_id related to the current span.
+
+        After register the plugin, if tracing is enabled, this method will be
+        called after the server finished sending response.
+
+        This method can be used to propagate census context.
+
+        Args:
+          trace_id: The identifier for the trace associated with the span as a
+            32-character hexadecimal encoded string,
+            e.g. 26ed0036f2eff2b7317bccce3e28d01f
+          span_id: The identifier for the span as a 16-character hexadecimal encoded
+            string. e.g. 113ec879e62583bc
+          is_sampled: A bool indicates whether the span is sampled.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def create_server_call_tracer_factory(
+        self,
+        *,
+        xds: bool = False,
+    ) -> Optional[ServerCallTracerFactoryCapsule]:
+        """Creates a ServerCallTracerFactoryCapsule.
+
+        This method will be called at server initialization time to create a
+        ServerCallTracerFactory, which will be registered to gRPC core.
+
+        The ServerCallTracerFactory is an object which implements
+        `grpc_core::ServerCallTracerFactory` interface and wrapped in a PyCapsule
+        using `server_call_tracer_factory` as name.
+
+        Args:
+          xds: Whether the server is xds server.
+
+        Returns:
+          A PyCapsule which stores a ServerCallTracerFactory object. Or None if
+        plugin decides not to create ServerCallTracerFactory.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def record_rpc_latency(
+        self, method: str, target: str, rpc_latency: float, status_code: Any
+    ) -> None:
+        """Record the latency of the RPC.
+
+        After register the plugin, if stats is enabled, this method will be
+        called at the end of each RPC.
+
+        Args:
+          method: The fully-qualified name of the RPC method being invoked.
+          target: The target name of the RPC method being invoked.
+          rpc_latency: The latency for the RPC in seconds, equals to the time between
+            when the client invokes the RPC and when the client receives the status.
+          status_code: An element of grpc.StatusCode in string format representing the
+            final status for the RPC.
+        """
+        raise NotImplementedError()
+
+    def set_tracing(self, enable: bool) -> None:
+        """Enable or disable tracing.
+
+        Args:
+          enable: A bool indicates whether tracing should be enabled.
+        """
+        self._tracing_enabled = enable
+
+    def set_stats(self, enable: bool) -> None:
+        """Enable or disable stats(metrics).
+
+        Args:
+          enable: A bool indicates whether stats should be enabled.
+        """
+        self._stats_enabled = enable
+
+    def save_registered_method(self, method_name: bytes) -> None:
+        """Saves the method name to registered_method list.
+
+        When exporting metrics, method name for unregistered methods will be replaced
+        with 'other' by default.
+
+        Args:
+          method_name: The method name in bytes.
+        """
+        raise NotImplementedError()
+
+    @property
+    def tracing_enabled(self) -> bool:
+        return self._tracing_enabled
+
+    @property
+    def stats_enabled(self) -> bool:
+        return self._stats_enabled
+
+    @property
+    def observability_enabled(self) -> bool:
+        return self.tracing_enabled or self.stats_enabled
+
+
+@contextlib.contextmanager
+def get_plugin() -> Generator[Optional[ObservabilityPlugin], None, None]:
+    """Get the ObservabilityPlugin in _observability module.
+
+    Returns:
+      The ObservabilityPlugin currently registered with the _observability
+    module. Or None if no plugin exists at the time of calling this method.
+    """
+    with _plugin_lock:
+        yield _OBSERVABILITY_PLUGIN
+
+
+def set_plugin(observability_plugin: Optional[ObservabilityPlugin]) -> None:
+    """Save ObservabilityPlugin to _observability module.
+
+    Args:
+      observability_plugin: The ObservabilityPlugin to save.
+
+    Raises:
+      ValueError: If an ObservabilityPlugin was already registered at the
+    time of calling this method.
+    """
+    global _OBSERVABILITY_PLUGIN  # pylint: disable=global-statement # noqa: PLW0603
+    with _plugin_lock:
+        if observability_plugin and _OBSERVABILITY_PLUGIN:
+            error_msg = "observability_plugin was already set!"
+            raise ValueError(error_msg)
+        _OBSERVABILITY_PLUGIN = observability_plugin
+
+
+def observability_init(observability_plugin: ObservabilityPlugin) -> None:
+    """Initialize observability with provided ObservabilityPlugin.
+
+    This method have to be called at the start of a program, before any
+    channels/servers are built.
+
+    Args:
+      observability_plugin: The ObservabilityPlugin to use.
+
+    Raises:
+      ValueError: If an ObservabilityPlugin was already registered at the
+    time of calling this method.
+    """
+    set_plugin(observability_plugin)
+
+
+def observability_deinit() -> None:
+    """Clear the observability context, including ObservabilityPlugin and
+    ServerCallTracerFactory
+
+    This method have to be called after exit observability context so that
+    it's possible to re-initialize again.
+    """
+    set_plugin(None)
+    _cygrpc.clear_server_call_tracer_factory()
+
+
+def maybe_record_rpc_latency(state: "_channel._RPCState") -> None:
+    """Record the latency of the RPC, if the plugin is registered and stats is enabled.
+
+    This method will be called at the end of each RPC.
+
+    Args:
+      state: a grpc._channel._RPCState object which contains the stats related to the
+    RPC.
+    """
+    # TODO(xuanwn): use channel args to exclude those metrics.
+    for exclude_prefix in _SERVICES_TO_EXCLUDE:
+        if exclude_prefix in state.method.encode("utf8"):
+            return
+    with get_plugin() as plugin:
+        if plugin and plugin.stats_enabled:
+            rpc_latency_s = state.rpc_end_time - state.rpc_start_time
+            rpc_latency_ms = rpc_latency_s * 1000
+            plugin.record_rpc_latency(
+                state.method, state.target, rpc_latency_ms, state.code
+            )
+
+
+def create_server_call_tracer_factory_option(
+    xds: bool,
+) -> Union[Tuple[ChannelArgumentType], Tuple[()]]:
+    with get_plugin() as plugin:
+        if plugin and plugin.stats_enabled:
+            server_call_tracer_factory_address = (
+                _cygrpc.get_server_call_tracer_factory_address(plugin, xds)
+            )
+            if server_call_tracer_factory_address:
+                return (
+                    (
+                        "grpc.experimental.server_call_tracer_factory",
+                        ServerCallTracerFactory(
+                            server_call_tracer_factory_address
+                        ),
+                    ),
+                )
+        return ()

server/venv/lib/python3.9/site-packages/grpc/_plugin_wrapping.py

@@ -0,0 +1,136 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import collections
+import logging
+import threading
+from typing import Callable, Optional, Type
+
+import grpc
+from grpc import _common
+from grpc._cython import cygrpc
+from grpc._typing import MetadataType
+
+_LOGGER = logging.getLogger(__name__)
+
+
+class _AuthMetadataContext(
+    collections.namedtuple(
+        "AuthMetadataContext",
+        (
+            "service_url",
+            "method_name",
+        ),
+    ),
+    grpc.AuthMetadataContext,
+):
+    pass
+
+
+class _CallbackState(object):
+    def __init__(self):
+        self.lock = threading.Lock()
+        self.called = False
+        self.exception = None
+
+
+class _AuthMetadataPluginCallback(grpc.AuthMetadataPluginCallback):
+    _state: _CallbackState
+    _callback: Callable
+
+    def __init__(self, state: _CallbackState, callback: Callable):
+        self._state = state
+        self._callback = callback
+
+    def __call__(
+        self, metadata: MetadataType, error: Optional[Type[BaseException]]
+    ):
+        with self._state.lock:
+            if self._state.exception is None:
+                if self._state.called:
+                    error_msg = (
+                        "AuthMetadataPluginCallback invoked more than once!"
+                    )
+                    raise RuntimeError(error_msg)
+                self._state.called = True
+            else:
+                error_msg = (
+                    "AuthMetadataPluginCallback"
+                    'raised exception "{self._state.exception}"!'
+                )
+                raise RuntimeError(error_msg)
+        if error is None:
+            self._callback(metadata, cygrpc.StatusCode.ok, None)
+        else:
+            self._callback(
+                None, cygrpc.StatusCode.internal, _common.encode(str(error))
+            )
+
+
+class _Plugin(object):
+    _metadata_plugin: grpc.AuthMetadataPlugin
+
+    def __init__(self, metadata_plugin: grpc.AuthMetadataPlugin):
+        self._metadata_plugin = metadata_plugin
+        self._stored_ctx = None
+
+        try:
+            import contextvars  # pylint: disable=wrong-import-position
+
+            # The plugin may be invoked on a thread created by Core, which will not
+            # have the context propagated. This context is stored and installed in
+            # the thread invoking the plugin.
+            self._stored_ctx = contextvars.copy_context()
+        except ImportError:
+            # Support versions predating contextvars.
+            pass
+
+    def __call__(self, service_url: str, method_name: str, callback: Callable):
+        context = _AuthMetadataContext(
+            _common.decode(service_url), _common.decode(method_name)
+        )
+        callback_state = _CallbackState()
+        try:
+            self._metadata_plugin(
+                context, _AuthMetadataPluginCallback(callback_state, callback)
+            )
+        except Exception as exception:  # pylint: disable=broad-except
+            _LOGGER.exception(
+                'AuthMetadataPluginCallback "%s" raised exception!',
+                self._metadata_plugin,
+            )
+            with callback_state.lock:
+                callback_state.exception = exception
+                if callback_state.called:
+                    return
+            callback(
+                None, cygrpc.StatusCode.internal, _common.encode(str(exception))
+            )
+
+
+def metadata_plugin_call_credentials(
+    metadata_plugin: grpc.AuthMetadataPlugin, name: Optional[str]
+) -> grpc.CallCredentials:
+    if name is None:
+        try:
+            effective_name = metadata_plugin.__name__
+        except AttributeError:
+            effective_name = metadata_plugin.__class__.__name__
+    else:
+        effective_name = name
+    return grpc.CallCredentials(
+        cygrpc.MetadataPluginCallCredentials(
+            _Plugin(metadata_plugin), _common.encode(effective_name)
+        )
+    )

server/venv/lib/python3.9/site-packages/grpc/_runtime_protos.py

@@ -0,0 +1,163 @@
+# Copyright 2020 The gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import sys
+import types
+from typing import Tuple, Union
+
+_REQUIRED_SYMBOLS = ("_protos", "_services", "_protos_and_services")
+_MINIMUM_VERSION = (3, 5, 0)
+
+_UNINSTALLED_TEMPLATE = (
+    "Install the grpcio-tools package (1.32.0+) to use the {} function."
+)
+_VERSION_ERROR_TEMPLATE = (
+    "The {} function is only on available on Python 3.X interpreters."
+)
+
+
+def _has_runtime_proto_symbols(mod: types.ModuleType) -> bool:
+    return all(hasattr(mod, sym) for sym in _REQUIRED_SYMBOLS)
+
+
+def _is_grpc_tools_importable() -> bool:
+    try:
+        import grpc_tools  # pylint: disable=unused-import # pytype: disable=import-error
+
+        return True
+    except ImportError as e:
+        # NOTE: It's possible that we're encountering a transitive ImportError, so
+        # we check for that and re-raise if so.
+        if "grpc_tools" not in e.args[0]:
+            raise
+        return False
+
+
+def _call_with_lazy_import(
+    fn_name: str, protobuf_path: str
+) -> Union[types.ModuleType, Tuple[types.ModuleType, types.ModuleType]]:
+    """Calls one of the three functions, lazily importing grpc_tools.
+
+    Args:
+      fn_name: The name of the function to import from grpc_tools.protoc.
+      protobuf_path: The path to import.
+
+    Returns:
+      The appropriate module object.
+    """
+    if sys.version_info < _MINIMUM_VERSION:
+        raise NotImplementedError(_VERSION_ERROR_TEMPLATE.format(fn_name))
+    if not _is_grpc_tools_importable():
+        raise NotImplementedError(_UNINSTALLED_TEMPLATE.format(fn_name))
+    import grpc_tools.protoc  # pytype: disable=import-error
+
+    if _has_runtime_proto_symbols(grpc_tools.protoc):
+        fn = getattr(grpc_tools.protoc, "_" + fn_name)
+        return fn(protobuf_path)
+    raise NotImplementedError(_UNINSTALLED_TEMPLATE.format(fn_name))
+
+
+def protos(protobuf_path):  # pylint: disable=unused-argument
+    """Returns a module generated by the indicated .proto file.
+
+    THIS IS AN EXPERIMENTAL API.
+
+    Use this function to retrieve classes corresponding to message
+    definitions in the .proto file.
+
+    To inspect the contents of the returned module, use the dir function.
+    For example:
+
+    ```
+    protos = grpc.protos("foo.proto")
+    print(dir(protos))
+    ```
+
+    The returned module object corresponds to the _pb2.py file generated
+    by protoc. The path is expected to be relative to an entry on sys.path
+    and all transitive dependencies of the file should also be resolvable
+    from an entry on sys.path.
+
+    To completely disable the machinery behind this function, set the
+    GRPC_PYTHON_DISABLE_DYNAMIC_STUBS environment variable to "true".
+
+    Args:
+      protobuf_path: The path to the .proto file on the filesystem. This path
+        must be resolvable from an entry on sys.path and so must all of its
+        transitive dependencies.
+
+    Returns:
+      A module object corresponding to the message code for the indicated
+      .proto file. Equivalent to a generated _pb2.py file.
+    """
+    return _call_with_lazy_import("protos", protobuf_path)
+
+
+def services(protobuf_path):  # pylint: disable=unused-argument
+    """Returns a module generated by the indicated .proto file.
+
+    THIS IS AN EXPERIMENTAL API.
+
+    Use this function to retrieve classes and functions corresponding to
+    service definitions in the .proto file, including both stub and servicer
+    definitions.
+
+    To inspect the contents of the returned module, use the dir function.
+    For example:
+
+    ```
+    services = grpc.services("foo.proto")
+    print(dir(services))
+    ```
+
+    The returned module object corresponds to the _pb2_grpc.py file generated
+    by protoc. The path is expected to be relative to an entry on sys.path
+    and all transitive dependencies of the file should also be resolvable
+    from an entry on sys.path.
+
+    To completely disable the machinery behind this function, set the
+    GRPC_PYTHON_DISABLE_DYNAMIC_STUBS environment variable to "true".
+
+    Args:
+      protobuf_path: The path to the .proto file on the filesystem. This path
+        must be resolvable from an entry on sys.path and so must all of its
+        transitive dependencies.
+
+    Returns:
+      A module object corresponding to the stub/service code for the indicated
+      .proto file. Equivalent to a generated _pb2_grpc.py file.
+    """
+    return _call_with_lazy_import("services", protobuf_path)
+
+
+def protos_and_services(protobuf_path):  # pylint: disable=unused-argument
+    """Returns a 2-tuple of modules corresponding to protos and services.
+
+    THIS IS AN EXPERIMENTAL API.
+
+    The return value of this function is equivalent to a call to protos and a
+    call to services.
+
+    To completely disable the machinery behind this function, set the
+    GRPC_PYTHON_DISABLE_DYNAMIC_STUBS environment variable to "true".
+
+    Args:
+      protobuf_path: The path to the .proto file on the filesystem. This path
+        must be resolvable from an entry on sys.path and so must all of its
+        transitive dependencies.
+
+    Returns:
+      A 2-tuple of module objects corresponding to (protos(path), services(path)).
+    """
+    return _call_with_lazy_import("protos_and_services", protobuf_path)

server/venv/lib/python3.9/site-packages/grpc/_simple_stubs.py

@@ -0,0 +1,587 @@
+# Copyright 2020 The gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Functions that obviate explicit stubs and explicit channels."""
+
+import collections
+import datetime
+import logging
+import os
+import threading
+from typing import (
+    Any,
+    AnyStr,
+    Callable,
+    Dict,
+    Iterator,
+    Optional,
+    Sequence,
+    Tuple,
+    TypeVar,
+    Union,
+)
+
+import grpc
+from grpc.experimental import experimental_api
+
+RequestType = TypeVar("RequestType")
+ResponseType = TypeVar("ResponseType")
+
+OptionsType = Sequence[Tuple[str, str]]
+CacheKey = Tuple[
+    str,
+    OptionsType,
+    Optional[grpc.ChannelCredentials],
+    Optional[grpc.Compression],
+]
+
+_LOGGER = logging.getLogger(__name__)
+
+_EVICTION_PERIOD_KEY = "GRPC_PYTHON_MANAGED_CHANNEL_EVICTION_SECONDS"
+if _EVICTION_PERIOD_KEY in os.environ:
+    _EVICTION_PERIOD = datetime.timedelta(
+        seconds=float(os.environ[_EVICTION_PERIOD_KEY])
+    )
+    _LOGGER.debug(
+        "Setting managed channel eviction period to %s", _EVICTION_PERIOD
+    )
+else:
+    _EVICTION_PERIOD = datetime.timedelta(minutes=10)
+
+_MAXIMUM_CHANNELS_KEY = "GRPC_PYTHON_MANAGED_CHANNEL_MAXIMUM"
+if _MAXIMUM_CHANNELS_KEY in os.environ:
+    _MAXIMUM_CHANNELS = int(os.environ[_MAXIMUM_CHANNELS_KEY])
+    _LOGGER.debug("Setting maximum managed channels to %d", _MAXIMUM_CHANNELS)
+else:
+    _MAXIMUM_CHANNELS = 2**8
+
+_DEFAULT_TIMEOUT_KEY = "GRPC_PYTHON_DEFAULT_TIMEOUT_SECONDS"
+if _DEFAULT_TIMEOUT_KEY in os.environ:
+    _DEFAULT_TIMEOUT = float(os.environ[_DEFAULT_TIMEOUT_KEY])
+    _LOGGER.debug("Setting default timeout seconds to %f", _DEFAULT_TIMEOUT)
+else:
+    _DEFAULT_TIMEOUT = 60.0
+
+
+def _create_channel(
+    target: str,
+    options: Sequence[Tuple[str, str]],
+    channel_credentials: Optional[grpc.ChannelCredentials],
+    compression: Optional[grpc.Compression],
+) -> grpc.Channel:
+    debug_msg = (
+        f"Creating secure channel with credentials '{channel_credentials}', "
+        f"options '{options}' and compression '{compression}'"
+    )
+    _LOGGER.debug(debug_msg)
+    return grpc.secure_channel(
+        target,
+        credentials=channel_credentials,
+        options=options,
+        compression=compression,
+    )
+
+
+class ChannelCache:
+    # NOTE(rbellevi): Untyped due to reference cycle.
+    _singleton = None
+    _lock: threading.RLock = threading.RLock()
+    _condition: threading.Condition = threading.Condition(lock=_lock)
+    _eviction_ready: threading.Event = threading.Event()
+
+    _mapping: Dict[CacheKey, Tuple[grpc.Channel, datetime.datetime]]
+    _eviction_thread: threading.Thread
+
+    def __init__(self):
+        self._mapping = collections.OrderedDict()
+        self._eviction_thread = threading.Thread(
+            target=ChannelCache._perform_evictions, daemon=True
+        )
+        self._eviction_thread.start()
+
+    @staticmethod
+    def get():
+        with ChannelCache._lock:
+            if ChannelCache._singleton is None:
+                ChannelCache._singleton = ChannelCache()
+        ChannelCache._eviction_ready.wait()
+        return ChannelCache._singleton
+
+    def _evict_locked(self, key: CacheKey):
+        channel, _ = self._mapping.pop(key)
+        _LOGGER.debug(
+            "Evicting channel %s with configuration %s.", channel, key
+        )
+        channel.close()
+        del channel
+
+    @staticmethod
+    def _perform_evictions():
+        while True:
+            with ChannelCache._lock:
+                ChannelCache._eviction_ready.set()
+                if not ChannelCache._singleton._mapping:
+                    ChannelCache._condition.wait()
+                elif len(ChannelCache._singleton._mapping) > _MAXIMUM_CHANNELS:
+                    key = next(iter(ChannelCache._singleton._mapping.keys()))
+                    ChannelCache._singleton._evict_locked(key)
+                    # And immediately reevaluate.
+                else:
+                    key, (_, eviction_time) = next(
+                        iter(ChannelCache._singleton._mapping.items())
+                    )
+                    now = datetime.datetime.now()
+                    if eviction_time <= now:
+                        ChannelCache._singleton._evict_locked(key)
+                        continue
+                    time_to_eviction = (eviction_time - now).total_seconds()
+                    # NOTE: We aim to *eventually* coalesce to a state in
+                    # which no overdue channels are in the cache and the
+                    # length of the cache is longer than _MAXIMUM_CHANNELS.
+                    # We tolerate momentary states in which these two
+                    # criteria are not met.
+                    ChannelCache._condition.wait(timeout=time_to_eviction)
+
+    def get_channel(
+        self,
+        target: str,
+        options: Sequence[Tuple[str, str]],
+        channel_credentials: Optional[grpc.ChannelCredentials],
+        insecure: bool,
+        compression: Optional[grpc.Compression],
+        method: str,
+        _registered_method: bool,
+    ) -> Tuple[grpc.Channel, Optional[int]]:
+        """Get a channel from cache or creates a new channel.
+
+        This method also takes care of register method for channel,
+          which means we'll register a new call handle if we're calling a
+          non-registered method for an existing channel.
+
+        Returns:
+            A tuple with two items. The first item is the channel, second item is
+              the call handle if the method is registered, None if it's not registered.
+        """
+        if insecure and channel_credentials:
+            raise ValueError(
+                "The insecure option is mutually exclusive with "
+                + "the channel_credentials option. Please use one "
+                + "or the other."
+            )
+        if insecure:
+            channel_credentials = (
+                grpc.experimental.insecure_channel_credentials()
+            )
+        elif channel_credentials is None:
+            _LOGGER.debug("Defaulting to SSL channel credentials.")
+            channel_credentials = grpc.ssl_channel_credentials()
+        key = (target, options, channel_credentials, compression)
+        with self._lock:
+            channel_data = self._mapping.get(key, None)
+            call_handle = None
+            if channel_data is not None:
+                channel = channel_data[0]
+                # Register a new call handle if we're calling a registered method for an
+                # existing channel and this method is not registered.
+                if _registered_method:
+                    call_handle = channel._get_registered_call_handle(method)
+                self._mapping.pop(key)
+                self._mapping[key] = (
+                    channel,
+                    datetime.datetime.now() + _EVICTION_PERIOD,
+                )
+                return channel, call_handle
+            channel = _create_channel(
+                target, options, channel_credentials, compression
+            )
+            if _registered_method:
+                call_handle = channel._get_registered_call_handle(method)
+            self._mapping[key] = (
+                channel,
+                datetime.datetime.now() + _EVICTION_PERIOD,
+            )
+            if (
+                len(self._mapping) == 1
+                or len(self._mapping) >= _MAXIMUM_CHANNELS
+            ):
+                self._condition.notify()
+            return channel, call_handle
+
+    def _test_only_channel_count(self) -> int:
+        with self._lock:
+            return len(self._mapping)
+
+
+@experimental_api
+# pylint: disable=too-many-locals
+def unary_unary(
+    request: RequestType,
+    target: str,
+    method: str,
+    request_serializer: Optional[Callable[[Any], bytes]] = None,
+    response_deserializer: Optional[Callable[[bytes], Any]] = None,
+    options: Sequence[Tuple[AnyStr, AnyStr]] = (),
+    channel_credentials: Optional[grpc.ChannelCredentials] = None,
+    insecure: bool = False,
+    call_credentials: Optional[grpc.CallCredentials] = None,
+    compression: Optional[grpc.Compression] = None,
+    wait_for_ready: Optional[bool] = None,
+    timeout: Optional[float] = _DEFAULT_TIMEOUT,
+    metadata: Optional[Sequence[Tuple[str, Union[str, bytes]]]] = None,
+    _registered_method: Optional[bool] = False,
+) -> ResponseType:
+    """Invokes a unary-unary RPC without an explicitly specified channel.
+
+    THIS IS AN EXPERIMENTAL API.
+
+    This is backed by a per-process cache of channels. Channels are evicted
+    from the cache after a fixed period by a background. Channels will also be
+    evicted if more than a configured maximum accumulate.
+
+    The default eviction period is 10 minutes. One may set the environment
+    variable "GRPC_PYTHON_MANAGED_CHANNEL_EVICTION_SECONDS" to configure this.
+
+    The default maximum number of channels is 256. One may set the
+    environment variable "GRPC_PYTHON_MANAGED_CHANNEL_MAXIMUM" to configure
+    this.
+
+    Args:
+      request: An iterator that yields request values for the RPC.
+      target: The server address.
+      method: The name of the RPC method.
+      request_serializer: Optional :term:`serializer` for serializing the request
+        message. Request goes unserialized in case None is passed.
+      response_deserializer: Optional :term:`deserializer` for deserializing the response
+        message. Response goes undeserialized in case None is passed.
+      options: An optional list of key-value pairs (:term:`channel_arguments` in gRPC Core
+        runtime) to configure the channel.
+      channel_credentials: A credential applied to the whole channel, e.g. the
+        return value of grpc.ssl_channel_credentials() or
+        grpc.insecure_channel_credentials().
+      insecure: If True, specifies channel_credentials as
+        :term:`grpc.insecure_channel_credentials()`. This option is mutually
+        exclusive with the `channel_credentials` option.
+      call_credentials: A call credential applied to each call individually,
+        e.g. the output of grpc.metadata_call_credentials() or
+        grpc.access_token_call_credentials().
+      compression: An optional value indicating the compression method to be
+        used over the lifetime of the channel, e.g. grpc.Compression.Gzip.
+      wait_for_ready: An optional flag indicating whether the RPC should fail
+        immediately if the connection is not ready at the time the RPC is
+        invoked, or if it should wait until the connection to the server
+        becomes ready. When using this option, the user will likely also want
+        to set a timeout. Defaults to True.
+      timeout: An optional duration of time in seconds to allow for the RPC,
+        after which an exception will be raised. If timeout is unspecified,
+        defaults to a timeout controlled by the
+        GRPC_PYTHON_DEFAULT_TIMEOUT_SECONDS environment variable. If that is
+        unset, defaults to 60 seconds. Supply a value of None to indicate that
+        no timeout should be enforced.
+      metadata: Optional metadata to send to the server.
+
+    Returns:
+      The response to the RPC.
+    """
+    channel, method_handle = ChannelCache.get().get_channel(
+        target,
+        options,
+        channel_credentials,
+        insecure,
+        compression,
+        method,
+        _registered_method,
+    )
+    multicallable = channel.unary_unary(
+        method, request_serializer, response_deserializer, method_handle
+    )
+    wait_for_ready = wait_for_ready if wait_for_ready is not None else True
+    return multicallable(
+        request,
+        metadata=metadata,
+        wait_for_ready=wait_for_ready,
+        credentials=call_credentials,
+        timeout=timeout,
+    )
+
+
+@experimental_api
+# pylint: disable=too-many-locals
+def unary_stream(
+    request: RequestType,
+    target: str,
+    method: str,
+    request_serializer: Optional[Callable[[Any], bytes]] = None,
+    response_deserializer: Optional[Callable[[bytes], Any]] = None,
+    options: Sequence[Tuple[AnyStr, AnyStr]] = (),
+    channel_credentials: Optional[grpc.ChannelCredentials] = None,
+    insecure: bool = False,
+    call_credentials: Optional[grpc.CallCredentials] = None,
+    compression: Optional[grpc.Compression] = None,
+    wait_for_ready: Optional[bool] = None,
+    timeout: Optional[float] = _DEFAULT_TIMEOUT,
+    metadata: Optional[Sequence[Tuple[str, Union[str, bytes]]]] = None,
+    _registered_method: Optional[bool] = False,
+) -> Iterator[ResponseType]:
+    """Invokes a unary-stream RPC without an explicitly specified channel.
+
+    THIS IS AN EXPERIMENTAL API.
+
+    This is backed by a per-process cache of channels. Channels are evicted
+    from the cache after a fixed period by a background. Channels will also be
+    evicted if more than a configured maximum accumulate.
+
+    The default eviction period is 10 minutes. One may set the environment
+    variable "GRPC_PYTHON_MANAGED_CHANNEL_EVICTION_SECONDS" to configure this.
+
+    The default maximum number of channels is 256. One may set the
+    environment variable "GRPC_PYTHON_MANAGED_CHANNEL_MAXIMUM" to configure
+    this.
+
+    Args:
+      request: An iterator that yields request values for the RPC.
+      target: The server address.
+      method: The name of the RPC method.
+      request_serializer: Optional :term:`serializer` for serializing the request
+        message. Request goes unserialized in case None is passed.
+      response_deserializer: Optional :term:`deserializer` for deserializing the response
+        message. Response goes undeserialized in case None is passed.
+      options: An optional list of key-value pairs (:term:`channel_arguments` in gRPC Core
+        runtime) to configure the channel.
+      channel_credentials: A credential applied to the whole channel, e.g. the
+        return value of grpc.ssl_channel_credentials().
+      insecure: If True, specifies channel_credentials as
+        :term:`grpc.insecure_channel_credentials()`. This option is mutually
+        exclusive with the `channel_credentials` option.
+      call_credentials: A call credential applied to each call individually,
+        e.g. the output of grpc.metadata_call_credentials() or
+        grpc.access_token_call_credentials().
+      compression: An optional value indicating the compression method to be
+        used over the lifetime of the channel, e.g. grpc.Compression.Gzip.
+      wait_for_ready: An optional flag indicating whether the RPC should fail
+        immediately if the connection is not ready at the time the RPC is
+        invoked, or if it should wait until the connection to the server
+        becomes ready. When using this option, the user will likely also want
+        to set a timeout. Defaults to True.
+      timeout: An optional duration of time in seconds to allow for the RPC,
+        after which an exception will be raised. If timeout is unspecified,
+        defaults to a timeout controlled by the
+        GRPC_PYTHON_DEFAULT_TIMEOUT_SECONDS environment variable. If that is
+        unset, defaults to 60 seconds. Supply a value of None to indicate that
+        no timeout should be enforced.
+      metadata: Optional metadata to send to the server.
+
+    Returns:
+      An iterator of responses.
+    """
+    channel, method_handle = ChannelCache.get().get_channel(
+        target,
+        options,
+        channel_credentials,
+        insecure,
+        compression,
+        method,
+        _registered_method,
+    )
+    multicallable = channel.unary_stream(
+        method, request_serializer, response_deserializer, method_handle
+    )
+    wait_for_ready = wait_for_ready if wait_for_ready is not None else True
+    return multicallable(
+        request,
+        metadata=metadata,
+        wait_for_ready=wait_for_ready,
+        credentials=call_credentials,
+        timeout=timeout,
+    )
+
+
+@experimental_api
+# pylint: disable=too-many-locals
+def stream_unary(
+    request_iterator: Iterator[RequestType],
+    target: str,
+    method: str,
+    request_serializer: Optional[Callable[[Any], bytes]] = None,
+    response_deserializer: Optional[Callable[[bytes], Any]] = None,
+    options: Sequence[Tuple[AnyStr, AnyStr]] = (),
+    channel_credentials: Optional[grpc.ChannelCredentials] = None,
+    insecure: bool = False,
+    call_credentials: Optional[grpc.CallCredentials] = None,
+    compression: Optional[grpc.Compression] = None,
+    wait_for_ready: Optional[bool] = None,
+    timeout: Optional[float] = _DEFAULT_TIMEOUT,
+    metadata: Optional[Sequence[Tuple[str, Union[str, bytes]]]] = None,
+    _registered_method: Optional[bool] = False,
+) -> ResponseType:
+    """Invokes a stream-unary RPC without an explicitly specified channel.
+
+    THIS IS AN EXPERIMENTAL API.
+
+    This is backed by a per-process cache of channels. Channels are evicted
+    from the cache after a fixed period by a background. Channels will also be
+    evicted if more than a configured maximum accumulate.
+
+    The default eviction period is 10 minutes. One may set the environment
+    variable "GRPC_PYTHON_MANAGED_CHANNEL_EVICTION_SECONDS" to configure this.
+
+    The default maximum number of channels is 256. One may set the
+    environment variable "GRPC_PYTHON_MANAGED_CHANNEL_MAXIMUM" to configure
+    this.
+
+    Args:
+      request_iterator: An iterator that yields request values for the RPC.
+      target: The server address.
+      method: The name of the RPC method.
+      request_serializer: Optional :term:`serializer` for serializing the request
+        message. Request goes unserialized in case None is passed.
+      response_deserializer: Optional :term:`deserializer` for deserializing the response
+        message. Response goes undeserialized in case None is passed.
+      options: An optional list of key-value pairs (:term:`channel_arguments` in gRPC Core
+        runtime) to configure the channel.
+      channel_credentials: A credential applied to the whole channel, e.g. the
+        return value of grpc.ssl_channel_credentials().
+      call_credentials: A call credential applied to each call individually,
+        e.g. the output of grpc.metadata_call_credentials() or
+        grpc.access_token_call_credentials().
+      insecure: If True, specifies channel_credentials as
+        :term:`grpc.insecure_channel_credentials()`. This option is mutually
+        exclusive with the `channel_credentials` option.
+      compression: An optional value indicating the compression method to be
+        used over the lifetime of the channel, e.g. grpc.Compression.Gzip.
+      wait_for_ready: An optional flag indicating whether the RPC should fail
+        immediately if the connection is not ready at the time the RPC is
+        invoked, or if it should wait until the connection to the server
+        becomes ready. When using this option, the user will likely also want
+        to set a timeout. Defaults to True.
+      timeout: An optional duration of time in seconds to allow for the RPC,
+        after which an exception will be raised. If timeout is unspecified,
+        defaults to a timeout controlled by the
+        GRPC_PYTHON_DEFAULT_TIMEOUT_SECONDS environment variable. If that is
+        unset, defaults to 60 seconds. Supply a value of None to indicate that
+        no timeout should be enforced.
+      metadata: Optional metadata to send to the server.
+
+    Returns:
+      The response to the RPC.
+    """
+    channel, method_handle = ChannelCache.get().get_channel(
+        target,
+        options,
+        channel_credentials,
+        insecure,
+        compression,
+        method,
+        _registered_method,
+    )
+    multicallable = channel.stream_unary(
+        method, request_serializer, response_deserializer, method_handle
+    )
+    wait_for_ready = wait_for_ready if wait_for_ready is not None else True
+    return multicallable(
+        request_iterator,
+        metadata=metadata,
+        wait_for_ready=wait_for_ready,
+        credentials=call_credentials,
+        timeout=timeout,
+    )
+
+
+@experimental_api
+# pylint: disable=too-many-locals
+def stream_stream(
+    request_iterator: Iterator[RequestType],
+    target: str,
+    method: str,
+    request_serializer: Optional[Callable[[Any], bytes]] = None,
+    response_deserializer: Optional[Callable[[bytes], Any]] = None,
+    options: Sequence[Tuple[AnyStr, AnyStr]] = (),
+    channel_credentials: Optional[grpc.ChannelCredentials] = None,
+    insecure: bool = False,
+    call_credentials: Optional[grpc.CallCredentials] = None,
+    compression: Optional[grpc.Compression] = None,
+    wait_for_ready: Optional[bool] = None,
+    timeout: Optional[float] = _DEFAULT_TIMEOUT,
+    metadata: Optional[Sequence[Tuple[str, Union[str, bytes]]]] = None,
+    _registered_method: Optional[bool] = False,
+) -> Iterator[ResponseType]:
+    """Invokes a stream-stream RPC without an explicitly specified channel.
+
+    THIS IS AN EXPERIMENTAL API.
+
+    This is backed by a per-process cache of channels. Channels are evicted
+    from the cache after a fixed period by a background. Channels will also be
+    evicted if more than a configured maximum accumulate.
+
+    The default eviction period is 10 minutes. One may set the environment
+    variable "GRPC_PYTHON_MANAGED_CHANNEL_EVICTION_SECONDS" to configure this.
+
+    The default maximum number of channels is 256. One may set the
+    environment variable "GRPC_PYTHON_MANAGED_CHANNEL_MAXIMUM" to configure
+    this.
+
+    Args:
+      request_iterator: An iterator that yields request values for the RPC.
+      target: The server address.
+      method: The name of the RPC method.
+      request_serializer: Optional :term:`serializer` for serializing the request
+        message. Request goes unserialized in case None is passed.
+      response_deserializer: Optional :term:`deserializer` for deserializing the response
+        message. Response goes undeserialized in case None is passed.
+      options: An optional list of key-value pairs (:term:`channel_arguments` in gRPC Core
+        runtime) to configure the channel.
+      channel_credentials: A credential applied to the whole channel, e.g. the
+        return value of grpc.ssl_channel_credentials().
+      call_credentials: A call credential applied to each call individually,
+        e.g. the output of grpc.metadata_call_credentials() or
+        grpc.access_token_call_credentials().
+      insecure: If True, specifies channel_credentials as
+        :term:`grpc.insecure_channel_credentials()`. This option is mutually
+        exclusive with the `channel_credentials` option.
+      compression: An optional value indicating the compression method to be
+        used over the lifetime of the channel, e.g. grpc.Compression.Gzip.
+      wait_for_ready: An optional flag indicating whether the RPC should fail
+        immediately if the connection is not ready at the time the RPC is
+        invoked, or if it should wait until the connection to the server
+        becomes ready. When using this option, the user will likely also want
+        to set a timeout. Defaults to True.
+      timeout: An optional duration of time in seconds to allow for the RPC,
+        after which an exception will be raised. If timeout is unspecified,
+        defaults to a timeout controlled by the
+        GRPC_PYTHON_DEFAULT_TIMEOUT_SECONDS environment variable. If that is
+        unset, defaults to 60 seconds. Supply a value of None to indicate that
+        no timeout should be enforced.
+      metadata: Optional metadata to send to the server.
+
+    Returns:
+      An iterator of responses.
+    """
+    channel, method_handle = ChannelCache.get().get_channel(
+        target,
+        options,
+        channel_credentials,
+        insecure,
+        compression,
+        method,
+        _registered_method,
+    )
+    multicallable = channel.stream_stream(
+        method, request_serializer, response_deserializer, method_handle
+    )
+    wait_for_ready = wait_for_ready if wait_for_ready is not None else True
+    return multicallable(
+        request_iterator,
+        metadata=metadata,
+        wait_for_ready=wait_for_ready,
+        credentials=call_credentials,
+        timeout=timeout,
+    )

server/venv/lib/python3.9/site-packages/grpc/_typing.py

@@ -0,0 +1,96 @@
+# Copyright 2022 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Common types for gRPC Sync API"""
+
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Callable,
+    Iterable,
+    Iterator,
+    Optional,
+    Sequence,
+    Tuple,
+    TypeVar,
+    Union,
+)
+
+from grpc._cython import cygrpc
+
+if TYPE_CHECKING:
+    from grpc import ServicerContext
+    from grpc._server import _RPCState
+
+RequestType = TypeVar("RequestType")
+ResponseType = TypeVar("ResponseType")
+SerializingFunction = Callable[[Any], bytes]
+DeserializingFunction = Callable[[bytes], Any]
+MetadataType = Sequence[Tuple[str, Union[str, bytes]]]
+ChannelArgumentType = Tuple[str, Any]
+DoneCallbackType = Callable[[Any], None]
+NullaryCallbackType = Callable[[], None]
+RequestIterableType = Iterable[Any]
+ResponseIterableType = Iterable[Any]
+UserTag = Callable[[cygrpc.BaseEvent], bool]
+IntegratedCallFactory = Callable[
+    [
+        int,
+        bytes,
+        Optional[str],
+        Optional[float],
+        Optional[MetadataType],
+        Optional[cygrpc.CallCredentials],
+        Sequence[Sequence[cygrpc.Operation]],
+        UserTag,
+        Any,
+        Optional[int],
+    ],
+    cygrpc.IntegratedCall,
+]
+ServerTagCallbackType = Tuple[
+    Optional["_RPCState"], Sequence[NullaryCallbackType]
+]
+ServerCallbackTag = Callable[[cygrpc.BaseEvent], ServerTagCallbackType]
+ArityAgnosticMethodHandler = Union[
+    Callable[
+        [RequestType, "ServicerContext", Callable[[ResponseType], None]],
+        ResponseType,
+    ],
+    Callable[
+        [RequestType, "ServicerContext", Callable[[ResponseType], None]],
+        Iterator[ResponseType],
+    ],
+    Callable[
+        [
+            Iterator[RequestType],
+            "ServicerContext",
+            Callable[[ResponseType], None],
+        ],
+        ResponseType,
+    ],
+    Callable[
+        [
+            Iterator[RequestType],
+            "ServicerContext",
+            Callable[[ResponseType], None],
+        ],
+        Iterator[ResponseType],
+    ],
+    Callable[[RequestType, "ServicerContext"], ResponseType],
+    Callable[[RequestType, "ServicerContext"], Iterator[ResponseType]],
+    Callable[[Iterator[RequestType], "ServicerContext"], ResponseType],
+    Callable[
+        [Iterator[RequestType], "ServicerContext"], Iterator[ResponseType]
+    ],
+]

server/venv/lib/python3.9/site-packages/grpc/_utilities.py

@@ -0,0 +1,220 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Internal utilities for gRPC Python."""
+
+import collections
+import logging
+import threading
+import time
+from typing import Callable, Dict, Optional, Sequence
+
+import grpc
+from grpc import _common
+from grpc._typing import DoneCallbackType
+
+_LOGGER = logging.getLogger(__name__)
+
+_DONE_CALLBACK_EXCEPTION_LOG_MESSAGE = (
+    'Exception calling connectivity future "done" callback!'
+)
+
+
+class RpcMethodHandler(
+    collections.namedtuple(
+        "_RpcMethodHandler",
+        (
+            "request_streaming",
+            "response_streaming",
+            "request_deserializer",
+            "response_serializer",
+            "unary_unary",
+            "unary_stream",
+            "stream_unary",
+            "stream_stream",
+        ),
+    ),
+    grpc.RpcMethodHandler,
+):
+    pass
+
+
+class DictionaryGenericHandler(grpc.ServiceRpcHandler):
+    _name: str
+    _method_handlers: Dict[str, grpc.RpcMethodHandler]
+
+    def __init__(
+        self, service: str, method_handlers: Dict[str, grpc.RpcMethodHandler]
+    ):
+        self._name = service
+        self._method_handlers = {
+            _common.fully_qualified_method(service, method): method_handler
+            for method, method_handler in method_handlers.items()
+        }
+
+    def service_name(self) -> str:
+        return self._name
+
+    def service(
+        self, handler_call_details: grpc.HandlerCallDetails
+    ) -> Optional[grpc.RpcMethodHandler]:
+        details_method = handler_call_details.method
+        return self._method_handlers.get(
+            details_method
+        )  # pytype: disable=attribute-error
+
+
+class _ChannelReadyFuture(grpc.Future):
+    _condition: threading.Condition
+    _channel: grpc.Channel
+    _matured: bool
+    _cancelled: bool
+    _done_callbacks: Sequence[Callable]
+
+    def __init__(self, channel: grpc.Channel):
+        self._condition = threading.Condition()
+        self._channel = channel
+
+        self._matured = False
+        self._cancelled = False
+        self._done_callbacks = []
+
+    def _block(self, timeout: Optional[float]) -> None:
+        until = None if timeout is None else time.time() + timeout
+        with self._condition:
+            while True:
+                if self._cancelled:
+                    raise grpc.FutureCancelledError()
+                if self._matured:
+                    return
+                if until is None:
+                    self._condition.wait()
+                else:
+                    remaining = until - time.time()
+                    if remaining < 0:
+                        raise grpc.FutureTimeoutError()
+                    self._condition.wait(timeout=remaining)
+
+    def _update(self, connectivity: Optional[grpc.ChannelConnectivity]) -> None:
+        with self._condition:
+            if (
+                not self._cancelled
+                and connectivity is grpc.ChannelConnectivity.READY
+            ):
+                self._matured = True
+                self._channel.unsubscribe(self._update)
+                self._condition.notify_all()
+                done_callbacks = tuple(self._done_callbacks)
+                self._done_callbacks = None
+            else:
+                return
+
+        for done_callback in done_callbacks:
+            try:
+                done_callback(self)
+            except Exception:  # pylint: disable=broad-except
+                _LOGGER.exception(_DONE_CALLBACK_EXCEPTION_LOG_MESSAGE)
+
+    def cancel(self) -> bool:
+        with self._condition:
+            if not self._matured:
+                self._cancelled = True
+                self._channel.unsubscribe(self._update)
+                self._condition.notify_all()
+                done_callbacks = tuple(self._done_callbacks)
+                self._done_callbacks = None
+            else:
+                return False
+
+        for done_callback in done_callbacks:
+            try:
+                done_callback(self)
+            except Exception:  # pylint: disable=broad-except
+                _LOGGER.exception(_DONE_CALLBACK_EXCEPTION_LOG_MESSAGE)
+
+        return True
+
+    def cancelled(self) -> bool:
+        with self._condition:
+            return self._cancelled
+
+    def running(self) -> bool:
+        with self._condition:
+            return not self._cancelled and not self._matured
+
+    def done(self) -> bool:
+        with self._condition:
+            return self._cancelled or self._matured
+
+    def result(self, timeout: Optional[float] = None) -> None:
+        self._block(timeout)
+
+    def exception(self, timeout: Optional[float] = None) -> None:
+        self._block(timeout)
+
+    def traceback(self, timeout: Optional[float] = None) -> None:
+        self._block(timeout)
+
+    def add_done_callback(self, fn: DoneCallbackType):
+        with self._condition:
+            if not self._cancelled and not self._matured:
+                self._done_callbacks.append(fn)
+                return
+
+        fn(self)
+
+    def start(self):
+        with self._condition:
+            self._channel.subscribe(self._update, try_to_connect=True)
+
+    def __del__(self):
+        with self._condition:
+            if not self._cancelled and not self._matured:
+                self._channel.unsubscribe(self._update)
+
+
+def channel_ready_future(channel: grpc.Channel) -> _ChannelReadyFuture:
+    ready_future = _ChannelReadyFuture(channel)
+    ready_future.start()
+    return ready_future
+
+
+def first_version_is_lower(version1: str, version2: str) -> bool:
+    """
+    Compares two versions in the format '1.60.1' or '1.60.1.dev0'.
+
+    This method will be used in all stubs generated by grpcio-tools to check whether
+    the stub version is compatible with the runtime grpcio.
+
+    Args:
+        version1: The first version string.
+        version2: The second version string.
+
+    Returns:
+        True if version1 is lower, False otherwise.
+    """
+    version1_list = version1.split(".")
+    version2_list = version2.split(".")
+
+    try:
+        for i in range(3):
+            if int(version1_list[i]) < int(version2_list[i]):
+                return True
+            if int(version1_list[i]) > int(version2_list[i]):
+                return False
+    except ValueError:
+        # Return false in case we can't convert version to int.
+        return False
+
+    # The version without dev0 will be considered lower.
+    return len(version1_list) < len(version2_list)

server/venv/lib/python3.9/site-packages/grpc/aio/__init__.py

@@ -0,0 +1,95 @@
+# Copyright 2019 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""gRPC's Asynchronous Python API.
+
+gRPC Async API objects may only be used on the thread on which they were
+created. AsyncIO doesn't provide thread safety for most of its APIs.
+"""
+
+from typing import Any, Optional, Sequence, Tuple
+
+import grpc
+from grpc._cython.cygrpc import AbortError
+from grpc._cython.cygrpc import BaseError
+from grpc._cython.cygrpc import EOF
+from grpc._cython.cygrpc import InternalError
+from grpc._cython.cygrpc import UsageError
+from grpc._cython.cygrpc import init_grpc_aio
+from grpc._cython.cygrpc import shutdown_grpc_aio
+
+from ._base_call import Call
+from ._base_call import RpcContext
+from ._base_call import StreamStreamCall
+from ._base_call import StreamUnaryCall
+from ._base_call import UnaryStreamCall
+from ._base_call import UnaryUnaryCall
+from ._base_channel import Channel
+from ._base_channel import StreamStreamMultiCallable
+from ._base_channel import StreamUnaryMultiCallable
+from ._base_channel import UnaryStreamMultiCallable
+from ._base_channel import UnaryUnaryMultiCallable
+from ._base_server import Server
+from ._base_server import ServicerContext
+from ._call import AioRpcError
+from ._channel import insecure_channel
+from ._channel import secure_channel
+from ._interceptor import ClientCallDetails
+from ._interceptor import ClientInterceptor
+from ._interceptor import InterceptedUnaryUnaryCall
+from ._interceptor import ServerInterceptor
+from ._interceptor import StreamStreamClientInterceptor
+from ._interceptor import StreamUnaryClientInterceptor
+from ._interceptor import UnaryStreamClientInterceptor
+from ._interceptor import UnaryUnaryClientInterceptor
+from ._metadata import Metadata
+from ._server import server
+from ._typing import ChannelArgumentType
+
+###################################  __all__  #################################
+
+__all__ = (
+    "EOF",
+    "AbortError",
+    "AioRpcError",
+    "BaseError",
+    "Call",
+    "Channel",
+    "ClientCallDetails",
+    "ClientInterceptor",
+    "InterceptedUnaryUnaryCall",
+    "InternalError",
+    "Metadata",
+    "RpcContext",
+    "Server",
+    "ServerInterceptor",
+    "ServicerContext",
+    "StreamStreamCall",
+    "StreamStreamClientInterceptor",
+    "StreamStreamMultiCallable",
+    "StreamUnaryCall",
+    "StreamUnaryClientInterceptor",
+    "StreamUnaryMultiCallable",
+    "UnaryStreamCall",
+    "UnaryStreamClientInterceptor",
+    "UnaryStreamMultiCallable",
+    "UnaryUnaryCall",
+    "UnaryUnaryClientInterceptor",
+    "UnaryUnaryMultiCallable",
+    "UsageError",
+    "init_grpc_aio",
+    "insecure_channel",
+    "secure_channel",
+    "server",
+    "shutdown_grpc_aio",
+)

server/venv/lib/python3.9/site-packages/grpc/aio/_base_call.py

@@ -0,0 +1,257 @@
+# Copyright 2019 The gRPC Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Abstract base classes for client-side Call objects.
+
+Call objects represents the RPC itself, and offer methods to access / modify
+its information. They also offer methods to manipulate the life-cycle of the
+RPC, e.g. cancellation.
+"""
+
+from abc import ABCMeta
+from abc import abstractmethod
+from typing import Any, AsyncIterator, Generator, Generic, Optional, Union
+
+import grpc
+
+from ._metadata import Metadata
+from ._typing import DoneCallbackType
+from ._typing import EOFType
+from ._typing import RequestType
+from ._typing import ResponseType
+
+__all__ = "Call", "RpcContext", "UnaryStreamCall", "UnaryUnaryCall"
+
+
+class RpcContext(metaclass=ABCMeta):
+    """Provides RPC-related information and action."""
+
+    @abstractmethod
+    def cancelled(self) -> bool:
+        """Return True if the RPC is cancelled.
+
+        The RPC is cancelled when the cancellation was requested with cancel().
+
+        Returns:
+          A bool indicates whether the RPC is cancelled or not.
+        """
+
+    @abstractmethod
+    def done(self) -> bool:
+        """Return True if the RPC is done.
+
+        An RPC is done if the RPC is completed, cancelled or aborted.
+
+        Returns:
+          A bool indicates if the RPC is done.
+        """
+
+    @abstractmethod
+    def time_remaining(self) -> Optional[float]:
+        """Describes the length of allowed time remaining for the RPC.
+
+        Returns:
+          A nonnegative float indicating the length of allowed time in seconds
+          remaining for the RPC to complete before it is considered to have
+          timed out, or None if no deadline was specified for the RPC.
+        """
+
+    @abstractmethod
+    def cancel(self) -> bool:
+        """Cancels the RPC.
+
+        Idempotent and has no effect if the RPC has already terminated.
+
+        Returns:
+          A bool indicates if the cancellation is performed or not.
+        """
+
+    @abstractmethod
+    def add_done_callback(self, callback: DoneCallbackType) -> None:
+        """Registers a callback to be called on RPC termination.
+
+        Args:
+          callback: A callable object will be called with the call object as
+          its only argument.
+        """
+
+
+class Call(RpcContext, metaclass=ABCMeta):
+    """The abstract base class of an RPC on the client-side."""
+
+    @abstractmethod
+    async def initial_metadata(self) -> Metadata:
+        """Accesses the initial metadata sent by the server.
+
+        Returns:
+          The initial :term:`metadata`.
+        """
+
+    @abstractmethod
+    async def trailing_metadata(self) -> Metadata:
+        """Accesses the trailing metadata sent by the server.
+
+        Returns:
+          The trailing :term:`metadata`.
+        """
+
+    @abstractmethod
+    async def code(self) -> grpc.StatusCode:
+        """Accesses the status code sent by the server.
+
+        Returns:
+          The StatusCode value for the RPC.
+        """
+
+    @abstractmethod
+    async def details(self) -> str:
+        """Accesses the details sent by the server.
+
+        Returns:
+          The details string of the RPC.
+        """
+
+    @abstractmethod
+    async def wait_for_connection(self) -> None:
+        """Waits until connected to peer and raises aio.AioRpcError if failed.
+
+        This is an EXPERIMENTAL method.
+
+        This method ensures the RPC has been successfully connected. Otherwise,
+        an AioRpcError will be raised to explain the reason of the connection
+        failure.
+
+        This method is recommended for building retry mechanisms.
+        """
+
+
+class UnaryUnaryCall(
+    Generic[RequestType, ResponseType], Call, metaclass=ABCMeta
+):
+    """The abstract base class of a unary-unary RPC on the client-side."""
+
+    @abstractmethod
+    def __await__(self) -> Generator[Any, None, ResponseType]:
+        """Await the response message to be ready.
+
+        Returns:
+          The response message of the RPC.
+        """
+
+
+class UnaryStreamCall(
+    Generic[RequestType, ResponseType], Call, metaclass=ABCMeta
+):
+    @abstractmethod
+    def __aiter__(self) -> AsyncIterator[ResponseType]:
+        """Returns the async iterator representation that yields messages.
+
+        Under the hood, it is calling the "read" method.
+
+        Returns:
+          An async iterator object that yields messages.
+        """
+
+    @abstractmethod
+    async def read(self) -> Union[EOFType, ResponseType]:
+        """Reads one message from the stream.
+
+        Read operations must be serialized when called from multiple
+        coroutines.
+
+        Note that the iterator and read/write APIs may not be mixed on
+        a single RPC.
+
+        Returns:
+          A response message, or an `grpc.aio.EOF` to indicate the end of the
+          stream.
+        """
+
+
+class StreamUnaryCall(
+    Generic[RequestType, ResponseType], Call, metaclass=ABCMeta
+):
+    @abstractmethod
+    async def write(self, request: RequestType) -> None:
+        """Writes one message to the stream.
+
+        Note that the iterator and read/write APIs may not be mixed on
+        a single RPC.
+
+        Raises:
+          An RpcError exception if the write failed.
+        """
+
+    @abstractmethod
+    async def done_writing(self) -> None:
+        """Notifies server that the client is done sending messages.
+
+        After done_writing is called, any additional invocation to the write
+        function will fail. This function is idempotent.
+        """
+
+    @abstractmethod
+    def __await__(self) -> Generator[Any, None, ResponseType]:
+        """Await the response message to be ready.
+
+        Returns:
+          The response message of the stream.
+        """
+
+
+class StreamStreamCall(
+    Generic[RequestType, ResponseType], Call, metaclass=ABCMeta
+):
+    @abstractmethod
+    def __aiter__(self) -> AsyncIterator[ResponseType]:
+        """Returns the async iterator representation that yields messages.
+
+        Under the hood, it is calling the "read" method.
+
+        Returns:
+          An async iterator object that yields messages.
+        """
+
+    @abstractmethod
+    async def read(self) -> Union[EOFType, ResponseType]:
+        """Reads one message from the stream.
+
+        Read operations must be serialized when called from multiple
+        coroutines.
+
+        Note that the iterator and read/write APIs may not be mixed on
+        a single RPC.
+
+        Returns:
+          A response message, or an `grpc.aio.EOF` to indicate the end of the
+          stream.
+        """
+
+    @abstractmethod
+    async def write(self, request: RequestType) -> None:
+        """Writes one message to the stream.
+
+        Note that the iterator and read/write APIs may not be mixed on
+        a single RPC.
+
+        Raises:
+          An RpcError exception if the write failed.
+        """
+
+    @abstractmethod
+    async def done_writing(self) -> None:
+        """Notifies server that the client is done sending messages.
+
+        After done_writing is called, any additional invocation to the write
+        function will fail. This function is idempotent.
+        """

server/venv/lib/python3.9/site-packages/grpc/aio/_base_channel.py

@@ -0,0 +1,364 @@
+# Copyright 2020 The gRPC Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Abstract base classes for Channel objects and Multicallable objects."""
+
+import abc
+from typing import Generic, Optional
+
+import grpc
+
+from . import _base_call
+from ._typing import DeserializingFunction
+from ._typing import MetadataType
+from ._typing import RequestIterableType
+from ._typing import RequestType
+from ._typing import ResponseType
+from ._typing import SerializingFunction
+
+
+class UnaryUnaryMultiCallable(Generic[RequestType, ResponseType], abc.ABC):
+    """Enables asynchronous invocation of a unary-call RPC."""
+
+    @abc.abstractmethod
+    def __call__(
+        self,
+        request: RequestType,
+        *,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> _base_call.UnaryUnaryCall[RequestType, ResponseType]:
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          request: The request value for the RPC.
+          timeout: An optional duration of time in seconds to allow
+            for the RPC.
+          metadata: Optional :term:`metadata` to be transmitted to the
+            service-side of the RPC.
+          credentials: An optional CallCredentials for the RPC. Only valid for
+            secure Channel.
+          wait_for_ready: An optional flag to enable :term:`wait_for_ready` mechanism.
+          compression: An element of grpc.Compression, e.g.
+            grpc.Compression.Gzip.
+
+        Returns:
+          A UnaryUnaryCall object.
+
+        Raises:
+          RpcError: Indicates that the RPC terminated with non-OK status. The
+            raised RpcError will also be a Call for the RPC affording the RPC's
+            metadata, status code, and details.
+        """
+
+
+class UnaryStreamMultiCallable(Generic[RequestType, ResponseType], abc.ABC):
+    """Enables asynchronous invocation of a server-streaming RPC."""
+
+    @abc.abstractmethod
+    def __call__(
+        self,
+        request: RequestType,
+        *,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> _base_call.UnaryStreamCall[RequestType, ResponseType]:
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          request: The request value for the RPC.
+          timeout: An optional duration of time in seconds to allow
+            for the RPC.
+          metadata: Optional :term:`metadata` to be transmitted to the
+            service-side of the RPC.
+          credentials: An optional CallCredentials for the RPC. Only valid for
+            secure Channel.
+          wait_for_ready: An optional flag to enable :term:`wait_for_ready` mechanism.
+          compression: An element of grpc.Compression, e.g.
+            grpc.Compression.Gzip.
+
+        Returns:
+          A UnaryStreamCall object.
+
+        Raises:
+          RpcError: Indicates that the RPC terminated with non-OK status. The
+            raised RpcError will also be a Call for the RPC affording the RPC's
+            metadata, status code, and details.
+        """
+
+
+class StreamUnaryMultiCallable(abc.ABC):
+    """Enables asynchronous invocation of a client-streaming RPC."""
+
+    @abc.abstractmethod
+    def __call__(
+        self,
+        request_iterator: Optional[RequestIterableType] = None,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> _base_call.StreamUnaryCall:
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          request_iterator: An optional async iterable or iterable of request
+            messages for the RPC.
+          timeout: An optional duration of time in seconds to allow
+            for the RPC.
+          metadata: Optional :term:`metadata` to be transmitted to the
+            service-side of the RPC.
+          credentials: An optional CallCredentials for the RPC. Only valid for
+            secure Channel.
+          wait_for_ready: An optional flag to enable :term:`wait_for_ready` mechanism.
+          compression: An element of grpc.Compression, e.g.
+            grpc.Compression.Gzip.
+
+        Returns:
+          A StreamUnaryCall object.
+
+        Raises:
+          RpcError: Indicates that the RPC terminated with non-OK status. The
+            raised RpcError will also be a Call for the RPC affording the RPC's
+            metadata, status code, and details.
+        """
+
+
+class StreamStreamMultiCallable(abc.ABC):
+    """Enables asynchronous invocation of a bidirectional-streaming RPC."""
+
+    @abc.abstractmethod
+    def __call__(
+        self,
+        request_iterator: Optional[RequestIterableType] = None,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> _base_call.StreamStreamCall:
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          request_iterator: An optional async iterable or iterable of request
+            messages for the RPC.
+          timeout: An optional duration of time in seconds to allow
+            for the RPC.
+          metadata: Optional :term:`metadata` to be transmitted to the
+            service-side of the RPC.
+          credentials: An optional CallCredentials for the RPC. Only valid for
+            secure Channel.
+          wait_for_ready: An optional flag to enable :term:`wait_for_ready` mechanism.
+          compression: An element of grpc.Compression, e.g.
+            grpc.Compression.Gzip.
+
+        Returns:
+          A StreamStreamCall object.
+
+        Raises:
+          RpcError: Indicates that the RPC terminated with non-OK status. The
+            raised RpcError will also be a Call for the RPC affording the RPC's
+            metadata, status code, and details.
+        """
+
+
+class Channel(abc.ABC):
+    """Enables asynchronous RPC invocation as a client.
+
+    Channel objects implement the Asynchronous Context Manager (aka. async
+    with) type, although they are not supported to be entered and exited
+    multiple times.
+    """
+
+    @abc.abstractmethod
+    async def __aenter__(self):
+        """Starts an asynchronous context manager.
+
+        Returns:
+          Channel the channel that was instantiated.
+        """
+
+    @abc.abstractmethod
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        """Finishes the asynchronous context manager by closing the channel.
+
+        Still active RPCs will be cancelled.
+        """
+
+    @abc.abstractmethod
+    async def close(self, grace: Optional[float] = None):
+        """Closes this Channel and releases all resources held by it.
+
+        This method immediately stops the channel from executing new RPCs in
+        all cases.
+
+        If a grace period is specified, this method waits until all active
+        RPCs are finished or until the grace period is reached. RPCs that haven't
+        been terminated within the grace period are aborted.
+        If a grace period is not specified (by passing None for grace),
+        all existing RPCs are cancelled immediately.
+
+        This method is idempotent.
+        """
+
+    @abc.abstractmethod
+    def get_state(
+        self, try_to_connect: bool = False
+    ) -> grpc.ChannelConnectivity:
+        """Checks the connectivity state of a channel.
+
+        This is an EXPERIMENTAL API.
+
+        If the channel reaches a stable connectivity state, it is guaranteed
+        that the return value of this function will eventually converge to that
+        state.
+
+        Args:
+          try_to_connect: a bool indicate whether the Channel should try to
+            connect to peer or not.
+
+        Returns: A ChannelConnectivity object.
+        """
+
+    @abc.abstractmethod
+    async def wait_for_state_change(
+        self,
+        last_observed_state: grpc.ChannelConnectivity,
+    ) -> None:
+        """Waits for a change in connectivity state.
+
+        This is an EXPERIMENTAL API.
+
+        The function blocks until there is a change in the channel connectivity
+        state from the "last_observed_state". If the state is already
+        different, this function will return immediately.
+
+        There is an inherent race between the invocation of
+        "Channel.wait_for_state_change" and "Channel.get_state". The state can
+        change arbitrary many times during the race, so there is no way to
+        observe every state transition.
+
+        If there is a need to put a timeout for this function, please refer to
+        "asyncio.wait_for".
+
+        Args:
+          last_observed_state: A grpc.ChannelConnectivity object representing
+            the last known state.
+        """
+
+    @abc.abstractmethod
+    async def channel_ready(self) -> None:
+        """Creates a coroutine that blocks until the Channel is READY."""
+
+    @abc.abstractmethod
+    def unary_unary(
+        self,
+        method: str,
+        request_serializer: Optional[SerializingFunction] = None,
+        response_deserializer: Optional[DeserializingFunction] = None,
+        _registered_method: Optional[bool] = False,
+    ) -> UnaryUnaryMultiCallable:
+        """Creates a UnaryUnaryMultiCallable for a unary-unary method.
+
+        Args:
+          method: The name of the RPC method.
+          request_serializer: Optional :term:`serializer` for serializing the request
+            message. Request goes unserialized in case None is passed.
+          response_deserializer: Optional :term:`deserializer` for deserializing the
+            response message. Response goes undeserialized in case None
+            is passed.
+          _registered_method: Implementation Private. Optional: A bool representing
+            whether the method is registered.
+
+        Returns:
+          A UnaryUnaryMultiCallable value for the named unary-unary method.
+        """
+
+    @abc.abstractmethod
+    def unary_stream(
+        self,
+        method: str,
+        request_serializer: Optional[SerializingFunction] = None,
+        response_deserializer: Optional[DeserializingFunction] = None,
+        _registered_method: Optional[bool] = False,
+    ) -> UnaryStreamMultiCallable:
+        """Creates a UnaryStreamMultiCallable for a unary-stream method.
+
+        Args:
+          method: The name of the RPC method.
+          request_serializer: Optional :term:`serializer` for serializing the request
+            message. Request goes unserialized in case None is passed.
+          response_deserializer: Optional :term:`deserializer` for deserializing the
+            response message. Response goes undeserialized in case None
+            is passed.
+          _registered_method: Implementation Private. Optional: A bool representing
+            whether the method is registered.
+
+        Returns:
+          A UnaryStreamMultiCallable value for the named unary-stream method.
+        """
+
+    @abc.abstractmethod
+    def stream_unary(
+        self,
+        method: str,
+        request_serializer: Optional[SerializingFunction] = None,
+        response_deserializer: Optional[DeserializingFunction] = None,
+        _registered_method: Optional[bool] = False,
+    ) -> StreamUnaryMultiCallable:
+        """Creates a StreamUnaryMultiCallable for a stream-unary method.
+
+        Args:
+          method: The name of the RPC method.
+          request_serializer: Optional :term:`serializer` for serializing the request
+            message. Request goes unserialized in case None is passed.
+          response_deserializer: Optional :term:`deserializer` for deserializing the
+            response message. Response goes undeserialized in case None
+            is passed.
+          _registered_method: Implementation Private. Optional: A bool representing
+            whether the method is registered.
+
+        Returns:
+          A StreamUnaryMultiCallable value for the named stream-unary method.
+        """
+
+    @abc.abstractmethod
+    def stream_stream(
+        self,
+        method: str,
+        request_serializer: Optional[SerializingFunction] = None,
+        response_deserializer: Optional[DeserializingFunction] = None,
+        _registered_method: Optional[bool] = False,
+    ) -> StreamStreamMultiCallable:
+        """Creates a StreamStreamMultiCallable for a stream-stream method.
+
+        Args:
+          method: The name of the RPC method.
+          request_serializer: Optional :term:`serializer` for serializing the request
+            message. Request goes unserialized in case None is passed.
+          response_deserializer: Optional :term:`deserializer` for deserializing the
+            response message. Response goes undeserialized in case None
+            is passed.
+          _registered_method: Implementation Private. Optional: A bool representing
+            whether the method is registered.
+
+        Returns:
+          A StreamStreamMultiCallable value for the named stream-stream method.
+        """

server/venv/lib/python3.9/site-packages/grpc/aio/_base_server.py

@@ -0,0 +1,387 @@
+# Copyright 2020 The gRPC Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Abstract base classes for server-side classes."""
+
+import abc
+from typing import Generic, Iterable, Mapping, NoReturn, Optional, Sequence
+
+import grpc
+
+from ._metadata import Metadata  # pylint: disable=unused-import
+from ._typing import DoneCallbackType
+from ._typing import MetadataType
+from ._typing import RequestType
+from ._typing import ResponseType
+
+
+class Server(abc.ABC):
+    """Serves RPCs."""
+
+    @abc.abstractmethod
+    def add_generic_rpc_handlers(
+        self, generic_rpc_handlers: Sequence[grpc.GenericRpcHandler]
+    ) -> None:
+        """Registers GenericRpcHandlers with this Server.
+
+        This method is only safe to call before the server is started.
+
+        Args:
+          generic_rpc_handlers: A sequence of GenericRpcHandlers that will be
+          used to service RPCs.
+        """
+
+    @abc.abstractmethod
+    def add_insecure_port(self, address: str) -> int:
+        """Opens an insecure port for accepting RPCs.
+
+        A port is a communication endpoint that used by networking protocols,
+        like TCP and UDP. To date, we only support TCP.
+
+        This method may only be called before starting the server.
+
+        Args:
+          address: The address for which to open a port. If the port is 0,
+            or not specified in the address, then the gRPC runtime will choose a port.
+
+        Returns:
+          An integer port on which the server will accept RPC requests.
+        """
+
+    @abc.abstractmethod
+    def add_secure_port(
+        self, address: str, server_credentials: grpc.ServerCredentials
+    ) -> int:
+        """Opens a secure port for accepting RPCs.
+
+        A port is a communication endpoint that used by networking protocols,
+        like TCP and UDP. To date, we only support TCP.
+
+        This method may only be called before starting the server.
+
+        Args:
+          address: The address for which to open a port.
+            if the port is 0, or not specified in the address, then the gRPC
+            runtime will choose a port.
+          server_credentials: A ServerCredentials object.
+
+        Returns:
+          An integer port on which the server will accept RPC requests.
+        """
+
+    @abc.abstractmethod
+    async def start(self) -> None:
+        """Starts this Server.
+
+        This method may only be called once. (i.e. it is not idempotent).
+        """
+
+    @abc.abstractmethod
+    async def stop(self, grace: Optional[float]) -> None:
+        """Stops this Server.
+
+        This method immediately stops the server from servicing new RPCs in
+        all cases.
+
+        If a grace period is specified, this method waits until all active
+        RPCs are finished or until the grace period is reached. RPCs that haven't
+        been terminated within the grace period are aborted.
+        If a grace period is not specified (by passing None for grace), all
+        existing RPCs are aborted immediately and this method blocks until
+        the last RPC handler terminates.
+
+        This method is idempotent and may be called at any time. Passing a
+        smaller grace value in a subsequent call will have the effect of
+        stopping the Server sooner (passing None will have the effect of
+        stopping the server immediately). Passing a larger grace value in a
+        subsequent call will not have the effect of stopping the server later
+        (i.e. the most restrictive grace value is used).
+
+        Args:
+          grace: A duration of time in seconds or None.
+        """
+
+    @abc.abstractmethod
+    async def wait_for_termination(
+        self, timeout: Optional[float] = None
+    ) -> bool:
+        """Continues current coroutine once the server stops.
+
+        This is an EXPERIMENTAL API.
+
+        The wait will not consume computational resources during blocking, and
+        it will block until one of the two following conditions are met:
+
+        1) The server is stopped or terminated;
+        2) A timeout occurs if timeout is not `None`.
+
+        The timeout argument works in the same way as `threading.Event.wait()`.
+        https://docs.python.org/3/library/threading.html#threading.Event.wait
+
+        Args:
+          timeout: A floating point number specifying a timeout for the
+            operation in seconds.
+
+        Returns:
+          A bool indicates if the operation times out.
+        """
+
+    def add_registered_method_handlers(  # noqa: B027
+        self, service_name, method_handlers
+    ):
+        """Registers GenericRpcHandlers with this Server.
+
+        This method is only safe to call before the server is started.
+
+        Args:
+          service_name: The service name.
+          method_handlers: A dictionary that maps method names to corresponding
+            RpcMethodHandler.
+        """
+
+
+# pylint: disable=too-many-public-methods
+class ServicerContext(Generic[RequestType, ResponseType], abc.ABC):
+    """A context object passed to method implementations."""
+
+    @abc.abstractmethod
+    async def read(self) -> RequestType:
+        """Reads one message from the RPC.
+
+        Only one read operation is allowed simultaneously.
+
+        Returns:
+          A response message of the RPC.
+
+        Raises:
+          An RpcError exception if the read failed.
+        """
+
+    @abc.abstractmethod
+    async def write(self, message: ResponseType) -> None:
+        """Writes one message to the RPC.
+
+        Only one write operation is allowed simultaneously.
+
+        Raises:
+          An RpcError exception if the write failed.
+        """
+
+    @abc.abstractmethod
+    async def send_initial_metadata(
+        self, initial_metadata: MetadataType
+    ) -> None:
+        """Sends the initial metadata value to the client.
+
+        This method need not be called by implementations if they have no
+        metadata to add to what the gRPC runtime will transmit.
+
+        Args:
+          initial_metadata: The initial :term:`metadata`.
+        """
+
+    @abc.abstractmethod
+    async def abort(
+        self,
+        code: grpc.StatusCode,
+        details: str = "",
+        trailing_metadata: MetadataType = (),
+    ) -> NoReturn:
+        """Raises an exception to terminate the RPC with a non-OK status.
+
+        The code and details passed as arguments will supersede any existing
+        ones.
+
+        Args:
+          code: A StatusCode object to be sent to the client.
+            It must not be StatusCode.OK.
+          details: A UTF-8-encodable string to be sent to the client upon
+            termination of the RPC.
+          trailing_metadata: A sequence of tuple represents the trailing
+            :term:`metadata`.
+
+        Raises:
+          Exception: An exception is always raised to signal the abortion the
+            RPC to the gRPC runtime.
+        """
+
+    @abc.abstractmethod
+    def set_trailing_metadata(self, trailing_metadata: MetadataType) -> None:
+        """Sends the trailing metadata for the RPC.
+
+        This method need not be called by implementations if they have no
+        metadata to add to what the gRPC runtime will transmit.
+
+        Args:
+          trailing_metadata: The trailing :term:`metadata`.
+        """
+
+    @abc.abstractmethod
+    def invocation_metadata(self) -> Optional[MetadataType]:
+        """Accesses the metadata sent by the client.
+
+        Returns:
+          The invocation :term:`metadata`.
+        """
+
+    @abc.abstractmethod
+    def set_code(self, code: grpc.StatusCode) -> None:
+        """Sets the value to be used as status code upon RPC completion.
+
+        This method need not be called by method implementations if they wish
+        the gRPC runtime to determine the status code of the RPC.
+
+        Args:
+          code: A StatusCode object to be sent to the client.
+        """
+
+    @abc.abstractmethod
+    def set_details(self, details: str) -> None:
+        """Sets the value to be used the as detail string upon RPC completion.
+
+        This method need not be called by method implementations if they have
+        no details to transmit.
+
+        Args:
+          details: A UTF-8-encodable string to be sent to the client upon
+            termination of the RPC.
+        """
+
+    @abc.abstractmethod
+    def set_compression(self, compression: grpc.Compression) -> None:
+        """Set the compression algorithm to be used for the entire call.
+
+        Args:
+          compression: An element of grpc.compression, e.g.
+            grpc.compression.Gzip.
+        """
+
+    @abc.abstractmethod
+    def disable_next_message_compression(self) -> None:
+        """Disables compression for the next response message.
+
+        This method will override any compression configuration set during
+        server creation or set on the call.
+        """
+
+    @abc.abstractmethod
+    def peer(self) -> str:
+        """Identifies the peer that invoked the RPC being serviced.
+
+        Returns:
+          A string identifying the peer that invoked the RPC being serviced.
+          The string format is determined by gRPC runtime.
+        """
+
+    @abc.abstractmethod
+    def peer_identities(self) -> Optional[Iterable[bytes]]:
+        """Gets one or more peer identity(s).
+
+        Equivalent to
+        servicer_context.auth_context().get(servicer_context.peer_identity_key())
+
+        Returns:
+          An iterable of the identities, or None if the call is not
+          authenticated. Each identity is returned as a raw bytes type.
+        """
+
+    @abc.abstractmethod
+    def peer_identity_key(self) -> Optional[str]:
+        """The auth property used to identify the peer.
+
+        For example, "x509_common_name" or "x509_subject_alternative_name" are
+        used to identify an SSL peer.
+
+        Returns:
+          The auth property (string) that indicates the
+          peer identity, or None if the call is not authenticated.
+        """
+
+    @abc.abstractmethod
+    def auth_context(self) -> Mapping[str, Iterable[bytes]]:
+        """Gets the auth context for the call.
+
+        Returns:
+          A map of strings to an iterable of bytes for each auth property.
+        """
+
+    def time_remaining(self) -> float:
+        """Describes the length of allowed time remaining for the RPC.
+
+        Returns:
+          A nonnegative float indicating the length of allowed time in seconds
+          remaining for the RPC to complete before it is considered to have
+          timed out, or None if no deadline was specified for the RPC.
+        """
+
+    def trailing_metadata(self):
+        """Access value to be used as trailing metadata upon RPC completion.
+
+        This is an EXPERIMENTAL API.
+
+        Returns:
+          The trailing :term:`metadata` for the RPC.
+        """
+        raise NotImplementedError()
+
+    def code(self):
+        """Accesses the value to be used as status code upon RPC completion.
+
+        This is an EXPERIMENTAL API.
+
+        Returns:
+          The StatusCode value for the RPC.
+        """
+        raise NotImplementedError()
+
+    def details(self):
+        """Accesses the value to be used as detail string upon RPC completion.
+
+        This is an EXPERIMENTAL API.
+
+        Returns:
+          The details string of the RPC.
+        """
+        raise NotImplementedError()
+
+    def add_done_callback(self, callback: DoneCallbackType) -> None:
+        """Registers a callback to be called on RPC termination.
+
+        This is an EXPERIMENTAL API.
+
+        Args:
+          callback: A callable object will be called with the servicer context
+            object as its only argument.
+        """
+
+    def cancelled(self) -> bool:
+        """Return True if the RPC is cancelled.
+
+        The RPC is cancelled when the cancellation was requested with cancel().
+
+        This is an EXPERIMENTAL API.
+
+        Returns:
+          A bool indicates whether the RPC is cancelled or not.
+        """
+
+    def done(self) -> bool:
+        """Return True if the RPC is done.
+
+        An RPC is done if the RPC is completed, cancelled or aborted.
+
+        This is an EXPERIMENTAL API.
+
+        Returns:
+          A bool indicates if the RPC is done.
+        """

server/venv/lib/python3.9/site-packages/grpc/aio/_call.py

@@ -0,0 +1,759 @@
+# Copyright 2019 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Invocation-side implementation of gRPC Asyncio Python."""
+
+import asyncio
+import enum
+from functools import partial
+import inspect
+import logging
+import traceback
+from typing import (
+    Any,
+    AsyncIterator,
+    Generator,
+    Generic,
+    Optional,
+    Tuple,
+    Union,
+)
+
+import grpc
+from grpc import _common
+from grpc._cython import cygrpc
+
+from . import _base_call
+from ._metadata import Metadata
+from ._typing import DeserializingFunction
+from ._typing import DoneCallbackType
+from ._typing import EOFType
+from ._typing import MetadataType
+from ._typing import MetadatumType
+from ._typing import RequestIterableType
+from ._typing import RequestType
+from ._typing import ResponseType
+from ._typing import SerializingFunction
+
+__all__ = "AioRpcError", "Call", "UnaryStreamCall", "UnaryUnaryCall"
+
+_LOCAL_CANCELLATION_DETAILS = "Locally cancelled by application!"
+_GC_CANCELLATION_DETAILS = "Cancelled upon garbage collection!"
+_RPC_ALREADY_FINISHED_DETAILS = "RPC already finished."
+_RPC_HALF_CLOSED_DETAILS = 'RPC is half closed after calling "done_writing".'
+_API_STYLE_ERROR = (
+    "The iterator and read/write APIs may not be mixed on a single RPC."
+)
+
+_OK_CALL_REPRESENTATION = (
+    '<{} of RPC that terminated with:\n\tstatus = {}\n\tdetails = "{}"\n>'
+)
+
+_NON_OK_CALL_REPRESENTATION = (
+    "<{} of RPC that terminated with:\n"
+    "\tstatus = {}\n"
+    '\tdetails = "{}"\n'
+    '\tdebug_error_string = "{}"\n'
+    ">"
+)
+
+_LOGGER = logging.getLogger(__name__)
+
+
+class AioRpcError(grpc.RpcError):
+    """An implementation of RpcError to be used by the asynchronous API.
+
+    Raised RpcError is a snapshot of the final status of the RPC, values are
+    determined. Hence, its methods no longer needs to be coroutines.
+    """
+
+    _code: grpc.StatusCode
+    _details: Optional[str]
+    _initial_metadata: Optional[Metadata]
+    _trailing_metadata: Optional[Metadata]
+    _debug_error_string: Optional[str]
+
+    def __init__(
+        self,
+        code: grpc.StatusCode,
+        initial_metadata: Metadata,
+        trailing_metadata: Metadata,
+        details: Optional[str] = None,
+        debug_error_string: Optional[str] = None,
+    ) -> None:
+        """Constructor.
+
+        Args:
+          code: The status code with which the RPC has been finalized.
+          initial_metadata: Optional initial metadata that could be sent by the
+            Server.
+          trailing_metadata: Optional metadata that could be sent by the Server.
+          details: Optional details explaining the reason of the error.
+          debug_error_string: Optional string
+        """
+        super().__init__()
+        self._code = code
+        self._details = details
+        self._initial_metadata = initial_metadata
+        self._trailing_metadata = trailing_metadata
+        self._debug_error_string = debug_error_string
+
+    def code(self) -> grpc.StatusCode:
+        """Accesses the status code sent by the server.
+
+        Returns:
+          The `grpc.StatusCode` status code.
+        """
+        return self._code
+
+    def details(self) -> Optional[str]:
+        """Accesses the details sent by the server.
+
+        Returns:
+          The description of the error.
+        """
+        return self._details
+
+    def initial_metadata(self) -> Metadata:
+        """Accesses the initial metadata sent by the server.
+
+        Returns:
+          The initial metadata received.
+        """
+        return self._initial_metadata
+
+    def trailing_metadata(self) -> Metadata:
+        """Accesses the trailing metadata sent by the server.
+
+        Returns:
+          The trailing metadata received.
+        """
+        return self._trailing_metadata
+
+    def debug_error_string(self) -> str:
+        """Accesses the debug error string sent by the server.
+
+        Returns:
+          The debug error string received.
+        """
+        return self._debug_error_string
+
+    def _repr(self) -> str:
+        """Assembles the error string for the RPC error."""
+        return _NON_OK_CALL_REPRESENTATION.format(
+            self.__class__.__name__,
+            self._code,
+            self._details,
+            self._debug_error_string,
+        )
+
+    def __repr__(self) -> str:
+        return self._repr()
+
+    def __str__(self) -> str:
+        return self._repr()
+
+    def __reduce__(self):
+        return (
+            type(self),
+            (
+                self._code,
+                self._initial_metadata,
+                self._trailing_metadata,
+                self._details,
+                self._debug_error_string,
+            ),
+        )
+
+
+def _create_rpc_error(
+    initial_metadata: MetadataType,
+    status: cygrpc.AioRpcStatus,
+) -> AioRpcError:
+    return AioRpcError(
+        _common.CYGRPC_STATUS_CODE_TO_STATUS_CODE[status.code()],
+        Metadata._create(initial_metadata),
+        Metadata.from_tuple(status.trailing_metadata()),
+        details=status.details(),
+        debug_error_string=status.debug_error_string(),
+    )
+
+
+class Call:
+    """Base implementation of client RPC Call object.
+
+    Implements logic around final status, metadata and cancellation.
+    """
+
+    _loop: asyncio.AbstractEventLoop
+    _code: grpc.StatusCode
+    _cython_call: cygrpc._AioCall
+    _metadata: Tuple[MetadatumType, ...]
+    _request_serializer: Optional[SerializingFunction]
+    _response_deserializer: Optional[DeserializingFunction]
+
+    def __init__(
+        self,
+        cython_call: cygrpc._AioCall,
+        metadata: Metadata,
+        request_serializer: Optional[SerializingFunction],
+        response_deserializer: Optional[DeserializingFunction],
+        loop: asyncio.AbstractEventLoop,
+    ) -> None:
+        self._loop = loop
+        self._cython_call = cython_call
+        self._metadata = tuple(metadata)
+        self._request_serializer = request_serializer
+        self._response_deserializer = response_deserializer
+
+    def __del__(self) -> None:
+        # The '_cython_call' object might be destructed before Call object
+        if hasattr(self, "_cython_call") and not self._cython_call.done():
+            self._cancel(_GC_CANCELLATION_DETAILS)
+
+    def cancelled(self) -> bool:
+        return self._cython_call.cancelled()
+
+    def _cancel(self, details: str) -> bool:
+        """Forwards the application cancellation reasoning."""
+        if not self._cython_call.done():
+            self._cython_call.cancel(details)
+            return True
+        return False
+
+    def cancel(self) -> bool:
+        return self._cancel(_LOCAL_CANCELLATION_DETAILS)
+
+    def done(self) -> bool:
+        return self._cython_call.done()
+
+    def add_done_callback(self, callback: DoneCallbackType) -> None:
+        cb = partial(callback, self)
+        self._cython_call.add_done_callback(cb)
+
+    def time_remaining(self) -> Optional[float]:
+        return self._cython_call.time_remaining()
+
+    async def initial_metadata(self) -> Metadata:
+        raw_metadata_tuple = await self._cython_call.initial_metadata()
+        return Metadata.from_tuple(raw_metadata_tuple)
+
+    async def trailing_metadata(self) -> Metadata:
+        raw_metadata_tuple = (
+            await self._cython_call.status()
+        ).trailing_metadata()
+        if not raw_metadata_tuple:
+            return Metadata()
+        return Metadata.from_tuple(raw_metadata_tuple)
+
+    async def code(self) -> grpc.StatusCode:
+        cygrpc_code = (await self._cython_call.status()).code()
+        return _common.CYGRPC_STATUS_CODE_TO_STATUS_CODE[cygrpc_code]
+
+    async def details(self) -> str:
+        return (await self._cython_call.status()).details()
+
+    async def debug_error_string(self) -> str:
+        return (await self._cython_call.status()).debug_error_string()
+
+    async def _raise_for_status(self) -> None:
+        if self._cython_call.is_locally_cancelled():
+            raise asyncio.CancelledError()
+        code = await self.code()
+        if code != grpc.StatusCode.OK:
+            raise _create_rpc_error(
+                await self.initial_metadata(),
+                await self._cython_call.status(),
+            )
+
+    def _repr(self) -> str:
+        return repr(self._cython_call)
+
+    def __repr__(self) -> str:
+        return self._repr()
+
+    def __str__(self) -> str:
+        return self._repr()
+
+
+class _APIStyle(enum.IntEnum):
+    UNKNOWN = 0
+    ASYNC_GENERATOR = 1
+    READER_WRITER = 2
+
+
+class _UnaryResponseMixin(Call, Generic[ResponseType]):
+    _call_response: asyncio.Task
+
+    def _init_unary_response_mixin(self, response_task: asyncio.Task):
+        self._call_response = response_task
+
+    def cancel(self) -> bool:
+        if super().cancel():
+            self._call_response.cancel()
+            return True
+        return False
+
+    def __await__(self) -> Generator[Any, None, ResponseType]:
+        """Wait till the ongoing RPC request finishes."""
+        try:
+            response = yield from self._call_response
+        except asyncio.CancelledError:
+            # Even if we caught all other CancelledError, there is still
+            # this corner case. If the application cancels immediately after
+            # the Call object is created, we will observe this
+            # `CancelledError`.
+            if not self.cancelled():
+                self.cancel()
+            raise
+
+        # NOTE(lidiz) If we raise RpcError in the task, and users doesn't
+        # 'await' on it. AsyncIO will log 'Task exception was never retrieved'.
+        # Instead, if we move the exception raising here, the spam stops.
+        # Unfortunately, there can only be one 'yield from' in '__await__'. So,
+        # we need to access the private instance variable.
+        if response is cygrpc.EOF:
+            if self._cython_call.is_locally_cancelled():
+                raise asyncio.CancelledError()
+            else:
+                raise _create_rpc_error(
+                    self._cython_call._initial_metadata,
+                    self._cython_call._status,
+                )
+        else:
+            return response
+
+
+class _StreamResponseMixin(Call):
+    _message_aiter: AsyncIterator[ResponseType]
+    _preparation: asyncio.Task
+    _response_style: _APIStyle
+
+    def _init_stream_response_mixin(self, preparation: asyncio.Task):
+        self._message_aiter = None
+        self._preparation = preparation
+        self._response_style = _APIStyle.UNKNOWN
+
+    def _update_response_style(self, style: _APIStyle):
+        if self._response_style is _APIStyle.UNKNOWN:
+            self._response_style = style
+        elif self._response_style is not style:
+            raise cygrpc.UsageError(_API_STYLE_ERROR)
+
+    def cancel(self) -> bool:
+        if super().cancel():
+            self._preparation.cancel()
+            return True
+        return False
+
+    async def _fetch_stream_responses(self) -> ResponseType:
+        message = await self._read()
+        while message is not cygrpc.EOF:
+            yield message
+            message = await self._read()
+
+        # If the read operation failed, Core should explain why.
+        await self._raise_for_status()
+
+    def __aiter__(self) -> AsyncIterator[ResponseType]:
+        self._update_response_style(_APIStyle.ASYNC_GENERATOR)
+        if self._message_aiter is None:
+            self._message_aiter = self._fetch_stream_responses()
+        return self._message_aiter
+
+    async def _read(self) -> ResponseType:
+        # Wait for the request being sent
+        await self._preparation
+
+        # Reads response message from Core
+        try:
+            raw_response = await self._cython_call.receive_serialized_message()
+        except asyncio.CancelledError:
+            if not self.cancelled():
+                self.cancel()
+            raise
+
+        if raw_response is cygrpc.EOF:
+            return cygrpc.EOF
+        return _common.deserialize(raw_response, self._response_deserializer)
+
+    async def read(self) -> Union[EOFType, ResponseType]:
+        if self.done():
+            await self._raise_for_status()
+            return cygrpc.EOF
+        self._update_response_style(_APIStyle.READER_WRITER)
+
+        response_message = await self._read()
+
+        if response_message is cygrpc.EOF:
+            # If the read operation failed, Core should explain why.
+            await self._raise_for_status()
+        return response_message
+
+
+class _StreamRequestMixin(Call):
+    _metadata_sent: asyncio.Event
+    _done_writing_flag: bool
+    _async_request_poller: Optional[asyncio.Task]
+    _request_style: _APIStyle
+
+    def _init_stream_request_mixin(
+        self, request_iterator: Optional[RequestIterableType]
+    ):
+        self._metadata_sent = asyncio.Event()
+        self._done_writing_flag = False
+
+        # If user passes in an async iterator, create a consumer Task.
+        if request_iterator is not None:
+            self._async_request_poller = self._loop.create_task(
+                self._consume_request_iterator(request_iterator)
+            )
+            self._request_style = _APIStyle.ASYNC_GENERATOR
+        else:
+            self._async_request_poller = None
+            self._request_style = _APIStyle.READER_WRITER
+
+    def _raise_for_different_style(self, style: _APIStyle):
+        if self._request_style is not style:
+            raise cygrpc.UsageError(_API_STYLE_ERROR)
+
+    def cancel(self) -> bool:
+        if super().cancel():
+            if self._async_request_poller is not None:
+                self._async_request_poller.cancel()
+            return True
+        return False
+
+    def _metadata_sent_observer(self):
+        self._metadata_sent.set()
+
+    async def _consume_request_iterator(
+        self, request_iterator: RequestIterableType
+    ) -> None:
+        try:
+            if inspect.isasyncgen(request_iterator) or hasattr(
+                request_iterator, "__aiter__"
+            ):
+                async for request in request_iterator:
+                    try:
+                        await self._write(request)
+                    except AioRpcError as rpc_error:
+                        _LOGGER.debug(
+                            (
+                                "Exception while consuming the"
+                                " request_iterator: %s"
+                            ),
+                            rpc_error,
+                        )
+                        return
+            else:
+                for request in request_iterator:
+                    try:
+                        await self._write(request)
+                    except AioRpcError as rpc_error:
+                        _LOGGER.debug(
+                            (
+                                "Exception while consuming the"
+                                " request_iterator: %s"
+                            ),
+                            rpc_error,
+                        )
+                        return
+
+            await self._done_writing()
+        except:  # pylint: disable=bare-except # noqa: E722
+            # Client iterators can raise exceptions, which we should handle by
+            # cancelling the RPC and logging the client's error. No exceptions
+            # should escape this function.
+            _LOGGER.debug(
+                "Client request_iterator raised exception:\n%s",
+                traceback.format_exc(),
+            )
+            self.cancel()
+
+    async def _write(self, request: RequestType) -> None:
+        if self.done():
+            raise asyncio.InvalidStateError(_RPC_ALREADY_FINISHED_DETAILS)
+        if self._done_writing_flag:
+            raise asyncio.InvalidStateError(_RPC_HALF_CLOSED_DETAILS)
+        if not self._metadata_sent.is_set():
+            await self._metadata_sent.wait()
+            if self.done():
+                await self._raise_for_status()
+
+        serialized_request = _common.serialize(
+            request, self._request_serializer
+        )
+        try:
+            await self._cython_call.send_serialized_message(serialized_request)
+        except cygrpc.InternalError as err:
+            self._cython_call.set_internal_error(str(err))
+            await self._raise_for_status()
+        except asyncio.CancelledError:
+            if not self.cancelled():
+                self.cancel()
+            raise
+
+    async def _done_writing(self) -> None:
+        if self.done():
+            # If the RPC is finished, do nothing.
+            return
+        if not self._done_writing_flag:
+            # If the done writing is not sent before, try to send it.
+            self._done_writing_flag = True
+            try:
+                await self._cython_call.send_receive_close()
+            except asyncio.CancelledError:
+                if not self.cancelled():
+                    self.cancel()
+                raise
+
+    async def write(self, request: RequestType) -> None:
+        self._raise_for_different_style(_APIStyle.READER_WRITER)
+        await self._write(request)
+
+    async def done_writing(self) -> None:
+        """Signal peer that client is done writing.
+
+        This method is idempotent.
+        """
+        self._raise_for_different_style(_APIStyle.READER_WRITER)
+        await self._done_writing()
+
+    async def wait_for_connection(self) -> None:
+        await self._metadata_sent.wait()
+        if self.done():
+            await self._raise_for_status()
+
+
+class UnaryUnaryCall(_UnaryResponseMixin, Call, _base_call.UnaryUnaryCall):
+    """Object for managing unary-unary RPC calls.
+
+    Returned when an instance of `UnaryUnaryMultiCallable` object is called.
+    """
+
+    _request: RequestType
+    _invocation_task: asyncio.Task
+
+    # pylint: disable=too-many-arguments
+    def __init__(
+        self,
+        request: RequestType,
+        deadline: Optional[float],
+        metadata: Metadata,
+        credentials: Optional[grpc.CallCredentials],
+        wait_for_ready: Optional[bool],
+        channel: cygrpc.AioChannel,
+        method: bytes,
+        request_serializer: Optional[SerializingFunction],
+        response_deserializer: Optional[DeserializingFunction],
+        loop: asyncio.AbstractEventLoop,
+    ) -> None:
+        super().__init__(
+            channel.call(method, deadline, credentials, wait_for_ready),
+            metadata,
+            request_serializer,
+            response_deserializer,
+            loop,
+        )
+        self._request = request
+        self._context = cygrpc.build_census_context()
+        self._invocation_task = loop.create_task(self._invoke())
+        self._init_unary_response_mixin(self._invocation_task)
+
+    async def _invoke(self) -> ResponseType:
+        serialized_request = _common.serialize(
+            self._request, self._request_serializer
+        )
+
+        # NOTE(lidiz) asyncio.CancelledError is not a good transport for status,
+        # because the asyncio.Task class do not cache the exception object.
+        # https://github.com/python/cpython/blob/edad4d89e357c92f70c0324b937845d652b20afd/Lib/asyncio/tasks.py#L785
+        try:
+            serialized_response = await self._cython_call.unary_unary(
+                serialized_request, self._metadata, self._context
+            )
+        except asyncio.CancelledError:
+            if not self.cancelled():
+                self.cancel()
+
+        if self._cython_call.is_ok():
+            return _common.deserialize(
+                serialized_response, self._response_deserializer
+            )
+        return cygrpc.EOF
+
+    async def wait_for_connection(self) -> None:
+        await self._invocation_task
+        if self.done():
+            await self._raise_for_status()
+
+
+class UnaryStreamCall(_StreamResponseMixin, Call, _base_call.UnaryStreamCall):
+    """Object for managing unary-stream RPC calls.
+
+    Returned when an instance of `UnaryStreamMultiCallable` object is called.
+    """
+
+    _request: RequestType
+    _send_unary_request_task: asyncio.Task
+
+    # pylint: disable=too-many-arguments
+    def __init__(
+        self,
+        request: RequestType,
+        deadline: Optional[float],
+        metadata: Metadata,
+        credentials: Optional[grpc.CallCredentials],
+        wait_for_ready: Optional[bool],
+        channel: cygrpc.AioChannel,
+        method: bytes,
+        request_serializer: Optional[SerializingFunction],
+        response_deserializer: Optional[DeserializingFunction],
+        loop: asyncio.AbstractEventLoop,
+    ) -> None:
+        super().__init__(
+            channel.call(method, deadline, credentials, wait_for_ready),
+            metadata,
+            request_serializer,
+            response_deserializer,
+            loop,
+        )
+        self._request = request
+        self._context = cygrpc.build_census_context()
+        self._send_unary_request_task = loop.create_task(
+            self._send_unary_request()
+        )
+        self._init_stream_response_mixin(self._send_unary_request_task)
+
+    async def _send_unary_request(self) -> ResponseType:
+        serialized_request = _common.serialize(
+            self._request, self._request_serializer
+        )
+        try:
+            await self._cython_call.initiate_unary_stream(
+                serialized_request, self._metadata, self._context
+            )
+        except asyncio.CancelledError:
+            if not self.cancelled():
+                self.cancel()
+            raise
+
+    async def wait_for_connection(self) -> None:
+        await self._send_unary_request_task
+        if self.done():
+            await self._raise_for_status()
+
+
+# pylint: disable=too-many-ancestors
+class StreamUnaryCall(
+    _StreamRequestMixin, _UnaryResponseMixin, Call, _base_call.StreamUnaryCall
+):
+    """Object for managing stream-unary RPC calls.
+
+    Returned when an instance of `StreamUnaryMultiCallable` object is called.
+    """
+
+    # pylint: disable=too-many-arguments
+    def __init__(
+        self,
+        request_iterator: Optional[RequestIterableType],
+        deadline: Optional[float],
+        metadata: Metadata,
+        credentials: Optional[grpc.CallCredentials],
+        wait_for_ready: Optional[bool],
+        channel: cygrpc.AioChannel,
+        method: bytes,
+        request_serializer: Optional[SerializingFunction],
+        response_deserializer: Optional[DeserializingFunction],
+        loop: asyncio.AbstractEventLoop,
+    ) -> None:
+        super().__init__(
+            channel.call(method, deadline, credentials, wait_for_ready),
+            metadata,
+            request_serializer,
+            response_deserializer,
+            loop,
+        )
+
+        self._context = cygrpc.build_census_context()
+        self._init_stream_request_mixin(request_iterator)
+        self._init_unary_response_mixin(loop.create_task(self._conduct_rpc()))
+
+    async def _conduct_rpc(self) -> ResponseType:
+        try:
+            serialized_response = await self._cython_call.stream_unary(
+                self._metadata, self._metadata_sent_observer, self._context
+            )
+        except asyncio.CancelledError:
+            if not self.cancelled():
+                self.cancel()
+            raise
+
+        if self._cython_call.is_ok():
+            return _common.deserialize(
+                serialized_response, self._response_deserializer
+            )
+        return cygrpc.EOF
+
+
+class StreamStreamCall(
+    _StreamRequestMixin, _StreamResponseMixin, Call, _base_call.StreamStreamCall
+):
+    """Object for managing stream-stream RPC calls.
+
+    Returned when an instance of `StreamStreamMultiCallable` object is called.
+    """
+
+    _initializer: asyncio.Task
+
+    # pylint: disable=too-many-arguments
+    def __init__(
+        self,
+        request_iterator: Optional[RequestIterableType],
+        deadline: Optional[float],
+        metadata: Metadata,
+        credentials: Optional[grpc.CallCredentials],
+        wait_for_ready: Optional[bool],
+        channel: cygrpc.AioChannel,
+        method: bytes,
+        request_serializer: Optional[SerializingFunction],
+        response_deserializer: Optional[DeserializingFunction],
+        loop: asyncio.AbstractEventLoop,
+    ) -> None:
+        super().__init__(
+            channel.call(method, deadline, credentials, wait_for_ready),
+            metadata,
+            request_serializer,
+            response_deserializer,
+            loop,
+        )
+        self._context = cygrpc.build_census_context()
+        self._initializer = self._loop.create_task(self._prepare_rpc())
+        self._init_stream_request_mixin(request_iterator)
+        self._init_stream_response_mixin(self._initializer)
+
+    async def _prepare_rpc(self):
+        """Prepares the RPC for receiving/sending messages.
+
+        All other operations around the stream should only happen after the
+        completion of this method.
+        """
+        try:
+            await self._cython_call.initiate_stream_stream(
+                self._metadata, self._metadata_sent_observer, self._context
+            )
+        except asyncio.CancelledError:
+            if not self.cancelled():
+                self.cancel()
+            # No need to raise RpcError here, because no one will `await` this task.

server/venv/lib/python3.9/site-packages/grpc/aio/_channel.py

@@ -0,0 +1,625 @@
+# Copyright 2019 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Invocation-side implementation of gRPC Asyncio Python."""
+
+import asyncio
+import sys
+from typing import Any, Iterable, List, Optional, Sequence
+
+import grpc
+from grpc import _common
+from grpc import _compression
+from grpc import _grpcio_metadata
+from grpc._cython import cygrpc
+
+from . import _base_call
+from . import _base_channel
+from ._call import StreamStreamCall
+from ._call import StreamUnaryCall
+from ._call import UnaryStreamCall
+from ._call import UnaryUnaryCall
+from ._interceptor import ClientInterceptor
+from ._interceptor import InterceptedStreamStreamCall
+from ._interceptor import InterceptedStreamUnaryCall
+from ._interceptor import InterceptedUnaryStreamCall
+from ._interceptor import InterceptedUnaryUnaryCall
+from ._interceptor import StreamStreamClientInterceptor
+from ._interceptor import StreamUnaryClientInterceptor
+from ._interceptor import UnaryStreamClientInterceptor
+from ._interceptor import UnaryUnaryClientInterceptor
+from ._metadata import Metadata
+from ._typing import ChannelArgumentType
+from ._typing import DeserializingFunction
+from ._typing import MetadataType
+from ._typing import RequestIterableType
+from ._typing import RequestType
+from ._typing import ResponseType
+from ._typing import SerializingFunction
+from ._utils import _timeout_to_deadline
+
+_USER_AGENT = "grpc-python-asyncio/{}".format(_grpcio_metadata.__version__)
+
+if sys.version_info[1] < 7:
+
+    def _all_tasks() -> Iterable[asyncio.Task]:
+        return asyncio.Task.all_tasks()  # pylint: disable=no-member
+
+else:
+
+    def _all_tasks() -> Iterable[asyncio.Task]:
+        return asyncio.all_tasks()
+
+
+def _augment_channel_arguments(
+    base_options: ChannelArgumentType, compression: Optional[grpc.Compression]
+):
+    compression_channel_argument = _compression.create_channel_option(
+        compression
+    )
+    user_agent_channel_argument = (
+        (
+            cygrpc.ChannelArgKey.primary_user_agent_string,
+            _USER_AGENT,
+        ),
+    )
+    return (
+        tuple(base_options)
+        + compression_channel_argument
+        + user_agent_channel_argument
+    )
+
+
+class _BaseMultiCallable:
+    """Base class of all multi callable objects.
+
+    Handles the initialization logic and stores common attributes.
+    """
+
+    _loop: asyncio.AbstractEventLoop
+    _channel: cygrpc.AioChannel
+    _method: bytes
+    _request_serializer: Optional[SerializingFunction]
+    _response_deserializer: Optional[DeserializingFunction]
+    _interceptors: Optional[Sequence[ClientInterceptor]]
+    _references: List[Any]
+    _loop: asyncio.AbstractEventLoop
+
+    # pylint: disable=too-many-arguments
+    def __init__(
+        self,
+        channel: cygrpc.AioChannel,
+        method: bytes,
+        request_serializer: Optional[SerializingFunction],
+        response_deserializer: Optional[DeserializingFunction],
+        interceptors: Optional[Sequence[ClientInterceptor]],
+        references: List[Any],
+        loop: asyncio.AbstractEventLoop,
+    ) -> None:
+        self._loop = loop
+        self._channel = channel
+        self._method = method
+        self._request_serializer = request_serializer
+        self._response_deserializer = response_deserializer
+        self._interceptors = interceptors
+        self._references = references
+
+    @staticmethod
+    def _init_metadata(
+        metadata: Optional[MetadataType] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> Metadata:
+        """Based on the provided values for <metadata> or <compression> initialise the final
+        metadata, as it should be used for the current call.
+        """
+        metadata = metadata or Metadata()
+        if not isinstance(metadata, Metadata) and isinstance(
+            metadata, Sequence
+        ):
+            metadata = Metadata.from_tuple(tuple(metadata))
+        if compression:
+            metadata = Metadata(
+                *_compression.augment_metadata(metadata, compression)
+            )
+        return metadata
+
+
+class UnaryUnaryMultiCallable(
+    _BaseMultiCallable, _base_channel.UnaryUnaryMultiCallable
+):
+    def __call__(
+        self,
+        request: RequestType,
+        *,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> _base_call.UnaryUnaryCall[RequestType, ResponseType]:
+        metadata = self._init_metadata(metadata, compression)
+        if not self._interceptors:
+            call = UnaryUnaryCall(
+                request,
+                _timeout_to_deadline(timeout),
+                metadata,
+                credentials,
+                wait_for_ready,
+                self._channel,
+                self._method,
+                self._request_serializer,
+                self._response_deserializer,
+                self._loop,
+            )
+        else:
+            call = InterceptedUnaryUnaryCall(
+                self._interceptors,
+                request,
+                timeout,
+                metadata,
+                credentials,
+                wait_for_ready,
+                self._channel,
+                self._method,
+                self._request_serializer,
+                self._response_deserializer,
+                self._loop,
+            )
+
+        return call
+
+
+class UnaryStreamMultiCallable(
+    _BaseMultiCallable, _base_channel.UnaryStreamMultiCallable
+):
+    def __call__(
+        self,
+        request: RequestType,
+        *,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> _base_call.UnaryStreamCall[RequestType, ResponseType]:
+        metadata = self._init_metadata(metadata, compression)
+
+        if not self._interceptors:
+            call = UnaryStreamCall(
+                request,
+                _timeout_to_deadline(timeout),
+                metadata,
+                credentials,
+                wait_for_ready,
+                self._channel,
+                self._method,
+                self._request_serializer,
+                self._response_deserializer,
+                self._loop,
+            )
+        else:
+            call = InterceptedUnaryStreamCall(
+                self._interceptors,
+                request,
+                timeout,
+                metadata,
+                credentials,
+                wait_for_ready,
+                self._channel,
+                self._method,
+                self._request_serializer,
+                self._response_deserializer,
+                self._loop,
+            )
+
+        return call
+
+
+class StreamUnaryMultiCallable(
+    _BaseMultiCallable, _base_channel.StreamUnaryMultiCallable
+):
+    def __call__(
+        self,
+        request_iterator: Optional[RequestIterableType] = None,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> _base_call.StreamUnaryCall:
+        metadata = self._init_metadata(metadata, compression)
+
+        if not self._interceptors:
+            call = StreamUnaryCall(
+                request_iterator,
+                _timeout_to_deadline(timeout),
+                metadata,
+                credentials,
+                wait_for_ready,
+                self._channel,
+                self._method,
+                self._request_serializer,
+                self._response_deserializer,
+                self._loop,
+            )
+        else:
+            call = InterceptedStreamUnaryCall(
+                self._interceptors,
+                request_iterator,
+                timeout,
+                metadata,
+                credentials,
+                wait_for_ready,
+                self._channel,
+                self._method,
+                self._request_serializer,
+                self._response_deserializer,
+                self._loop,
+            )
+
+        return call
+
+
+class StreamStreamMultiCallable(
+    _BaseMultiCallable, _base_channel.StreamStreamMultiCallable
+):
+    def __call__(
+        self,
+        request_iterator: Optional[RequestIterableType] = None,
+        timeout: Optional[float] = None,
+        metadata: Optional[MetadataType] = None,
+        credentials: Optional[grpc.CallCredentials] = None,
+        wait_for_ready: Optional[bool] = None,
+        compression: Optional[grpc.Compression] = None,
+    ) -> _base_call.StreamStreamCall:
+        metadata = self._init_metadata(metadata, compression)
+
+        if not self._interceptors:
+            call = StreamStreamCall(
+                request_iterator,
+                _timeout_to_deadline(timeout),
+                metadata,
+                credentials,
+                wait_for_ready,
+                self._channel,
+                self._method,
+                self._request_serializer,
+                self._response_deserializer,
+                self._loop,
+            )
+        else:
+            call = InterceptedStreamStreamCall(
+                self._interceptors,
+                request_iterator,
+                timeout,
+                metadata,
+                credentials,
+                wait_for_ready,
+                self._channel,
+                self._method,
+                self._request_serializer,
+                self._response_deserializer,
+                self._loop,
+            )
+
+        return call
+
+
+class Channel(_base_channel.Channel):
+    _loop: asyncio.AbstractEventLoop
+    _channel: cygrpc.AioChannel
+    _unary_unary_interceptors: List[UnaryUnaryClientInterceptor]
+    _unary_stream_interceptors: List[UnaryStreamClientInterceptor]
+    _stream_unary_interceptors: List[StreamUnaryClientInterceptor]
+    _stream_stream_interceptors: List[StreamStreamClientInterceptor]
+
+    def __init__(
+        self,
+        target: str,
+        options: ChannelArgumentType,
+        credentials: Optional[cygrpc.ChannelCredentials],
+        compression: Optional[grpc.Compression],
+        interceptors: Optional[Sequence[ClientInterceptor]],
+    ):
+        """Constructor.
+
+        Args:
+          target: The target to which to connect.
+          options: Configuration options for the channel.
+          credentials: A cygrpc.ChannelCredentials or None.
+          compression: An optional value indicating the compression method to be
+            used over the lifetime of the channel.
+          interceptors: An optional list of interceptors that would be used for
+            intercepting any RPC executed with that channel.
+        """
+        self._unary_unary_interceptors = []
+        self._unary_stream_interceptors = []
+        self._stream_unary_interceptors = []
+        self._stream_stream_interceptors = []
+
+        if interceptors is not None:
+            for interceptor in interceptors:
+                if isinstance(interceptor, UnaryUnaryClientInterceptor):
+                    self._unary_unary_interceptors.append(interceptor)
+                elif isinstance(interceptor, UnaryStreamClientInterceptor):
+                    self._unary_stream_interceptors.append(interceptor)
+                elif isinstance(interceptor, StreamUnaryClientInterceptor):
+                    self._stream_unary_interceptors.append(interceptor)
+                elif isinstance(interceptor, StreamStreamClientInterceptor):
+                    self._stream_stream_interceptors.append(interceptor)
+                else:
+                    raise ValueError(  # noqa: TRY004
+                        "Interceptor {} must be ".format(interceptor)
+                        + "{} or ".format(UnaryUnaryClientInterceptor.__name__)
+                        + "{} or ".format(UnaryStreamClientInterceptor.__name__)
+                        + "{} or ".format(StreamUnaryClientInterceptor.__name__)
+                        + "{}. ".format(StreamStreamClientInterceptor.__name__)
+                    )
+
+        self._loop = cygrpc.get_working_loop()
+        self._channel = cygrpc.AioChannel(
+            _common.encode(target),
+            _augment_channel_arguments(options, compression),
+            credentials,
+            self._loop,
+        )
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        await self._close(None)
+
+    async def _close(self, grace):  # pylint: disable=too-many-branches
+        if self._channel.closed():
+            return
+
+        # No new calls will be accepted by the Cython channel.
+        self._channel.closing()
+
+        # Iterate through running tasks
+        tasks = _all_tasks()
+        calls = []
+        call_tasks = []
+        for task in tasks:
+            try:
+                stack = task.get_stack(limit=1)
+            except AttributeError as attribute_error:
+                # NOTE(lidiz) tl;dr: If the Task is created with a CPython
+                # object, it will trigger AttributeError.
+                #
+                # In the global finalizer, the event loop schedules
+                # a CPython PyAsyncGenAThrow object.
+                # https://github.com/python/cpython/blob/00e45877e33d32bb61aa13a2033e3bba370bda4d/Lib/asyncio/base_events.py#L484
+                #
+                # However, the PyAsyncGenAThrow object is written in C and
+                # failed to include the normal Python frame objects. Hence,
+                # this exception is a false negative, and it is safe to ignore
+                # the failure. It is fixed by https://github.com/python/cpython/pull/18669,
+                # but not available until 3.9 or 3.8.3. So, we have to keep it
+                # for a while.
+                # TODO(lidiz): drop this hack after 3.8 deprecation
+                if "frame" in str(attribute_error):
+                    continue
+                raise
+
+            # If the Task is created by a C-extension, the stack will be empty.
+            if not stack:
+                continue
+
+            # Locate ones created by `aio.Call`.
+            frame = stack[0]
+            candidate = frame.f_locals.get("self")
+            # Explicitly check for a non-null candidate instead of the more pythonic 'if candidate:'
+            # because doing 'if candidate:' assumes that the coroutine implements '__bool__' which
+            # might not always be the case.
+            if candidate is not None and isinstance(candidate, _base_call.Call):
+                if hasattr(candidate, "_channel"):
+                    # For intercepted Call object
+                    if candidate._channel is not self._channel:
+                        continue
+                elif hasattr(candidate, "_cython_call"):
+                    # For normal Call object
+                    if candidate._cython_call._channel is not self._channel:
+                        continue
+                else:
+                    # Unidentified Call object
+                    error_msg = f"Unrecognized call object: {candidate}"
+                    raise cygrpc.InternalError(error_msg)
+
+                calls.append(candidate)
+                call_tasks.append(task)
+
+        # If needed, try to wait for them to finish.
+        # Call objects are not always awaitables.
+        if grace and call_tasks:
+            await asyncio.wait(call_tasks, timeout=grace)
+
+        # Time to cancel existing calls.
+        for call in calls:
+            call.cancel()
+
+        # Destroy the channel
+        self._channel.close()
+
+    async def close(self, grace: Optional[float] = None):
+        await self._close(grace)
+
+    def __del__(self):
+        if hasattr(self, "_channel") and not self._channel.closed():
+            self._channel.close()
+
+    def get_state(
+        self, try_to_connect: bool = False
+    ) -> grpc.ChannelConnectivity:
+        result = self._channel.check_connectivity_state(try_to_connect)
+        return _common.CYGRPC_CONNECTIVITY_STATE_TO_CHANNEL_CONNECTIVITY[result]
+
+    async def wait_for_state_change(
+        self,
+        last_observed_state: grpc.ChannelConnectivity,
+    ) -> None:
+        assert await self._channel.watch_connectivity_state(
+            last_observed_state.value[0], None
+        )
+
+    async def channel_ready(self) -> None:
+        state = self.get_state(try_to_connect=True)
+        while state != grpc.ChannelConnectivity.READY:
+            await self.wait_for_state_change(state)
+            state = self.get_state(try_to_connect=True)
+
+    # TODO(xuanwn): Implement this method after we have
+    # observability for Asyncio.
+    def _get_registered_call_handle(self, method: str) -> int:
+        pass
+
+    # TODO(xuanwn): Implement _registered_method after we have
+    # observability for Asyncio.
+    # pylint: disable=arguments-differ,unused-argument
+    def unary_unary(
+        self,
+        method: str,
+        request_serializer: Optional[SerializingFunction] = None,
+        response_deserializer: Optional[DeserializingFunction] = None,
+        _registered_method: Optional[bool] = False,
+    ) -> UnaryUnaryMultiCallable:
+        return UnaryUnaryMultiCallable(
+            self._channel,
+            _common.encode(method),
+            request_serializer,
+            response_deserializer,
+            self._unary_unary_interceptors,
+            [self],
+            self._loop,
+        )
+
+    # TODO(xuanwn): Implement _registered_method after we have
+    # observability for Asyncio.
+    # pylint: disable=arguments-differ,unused-argument
+    def unary_stream(
+        self,
+        method: str,
+        request_serializer: Optional[SerializingFunction] = None,
+        response_deserializer: Optional[DeserializingFunction] = None,
+        _registered_method: Optional[bool] = False,
+    ) -> UnaryStreamMultiCallable:
+        return UnaryStreamMultiCallable(
+            self._channel,
+            _common.encode(method),
+            request_serializer,
+            response_deserializer,
+            self._unary_stream_interceptors,
+            [self],
+            self._loop,
+        )
+
+    # TODO(xuanwn): Implement _registered_method after we have
+    # observability for Asyncio.
+    # pylint: disable=arguments-differ,unused-argument
+    def stream_unary(
+        self,
+        method: str,
+        request_serializer: Optional[SerializingFunction] = None,
+        response_deserializer: Optional[DeserializingFunction] = None,
+        _registered_method: Optional[bool] = False,
+    ) -> StreamUnaryMultiCallable:
+        return StreamUnaryMultiCallable(
+            self._channel,
+            _common.encode(method),
+            request_serializer,
+            response_deserializer,
+            self._stream_unary_interceptors,
+            [self],
+            self._loop,
+        )
+
+    # TODO(xuanwn): Implement _registered_method after we have
+    # observability for Asyncio.
+    # pylint: disable=arguments-differ,unused-argument
+    def stream_stream(
+        self,
+        method: str,
+        request_serializer: Optional[SerializingFunction] = None,
+        response_deserializer: Optional[DeserializingFunction] = None,
+        _registered_method: Optional[bool] = False,
+    ) -> StreamStreamMultiCallable:
+        return StreamStreamMultiCallable(
+            self._channel,
+            _common.encode(method),
+            request_serializer,
+            response_deserializer,
+            self._stream_stream_interceptors,
+            [self],
+            self._loop,
+        )
+
+
+def insecure_channel(
+    target: str,
+    options: Optional[ChannelArgumentType] = None,
+    compression: Optional[grpc.Compression] = None,
+    interceptors: Optional[Sequence[ClientInterceptor]] = None,
+):
+    """Creates an insecure asynchronous Channel to a server.
+
+    Args:
+      target: The server address
+      options: An optional list of key-value pairs (:term:`channel_arguments`
+        in gRPC Core runtime) to configure the channel.
+      compression: An optional value indicating the compression method to be
+        used over the lifetime of the channel.
+      interceptors: An optional sequence of interceptors that will be executed for
+        any call executed with this channel.
+
+    Returns:
+      A Channel.
+    """
+    return Channel(
+        target,
+        () if options is None else options,
+        None,
+        compression,
+        interceptors,
+    )
+
+
+def secure_channel(
+    target: str,
+    credentials: grpc.ChannelCredentials,
+    options: Optional[ChannelArgumentType] = None,
+    compression: Optional[grpc.Compression] = None,
+    interceptors: Optional[Sequence[ClientInterceptor]] = None,
+):
+    """Creates a secure asynchronous Channel to a server.
+
+    Args:
+      target: The server address.
+      credentials: A ChannelCredentials instance.
+      options: An optional list of key-value pairs (:term:`channel_arguments`
+        in gRPC Core runtime) to configure the channel.
+      compression: An optional value indicating the compression method to be
+        used over the lifetime of the channel.
+      interceptors: An optional sequence of interceptors that will be executed for
+        any call executed with this channel.
+
+    Returns:
+      An aio.Channel.
+    """
+    return Channel(
+        target,
+        () if options is None else options,
+        credentials._credentials,
+        compression,
+        interceptors,
+    )

server/venv/lib/python3.9/site-packages/grpc/aio/_metadata.py

@@ -0,0 +1,167 @@
+# Copyright 2020 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Implementation of the metadata abstraction for gRPC Asyncio Python."""
+from __future__ import annotations
+
+from collections import OrderedDict
+from collections.abc import Collection
+from collections.abc import ItemsView
+from collections.abc import Iterable
+from collections.abc import Iterator
+from collections.abc import KeysView
+from collections.abc import Sequence
+from collections.abc import ValuesView
+from typing import Any, List, Optional, Tuple, Union
+
+from typing_extensions import Self
+
+MetadataKey = str
+MetadataValue = Union[str, bytes]
+MetadatumType = Tuple[MetadataKey, MetadataValue]
+MetadataType = Union["Metadata", Sequence[MetadatumType]]
+
+
+class Metadata(Collection):  # noqa: PLW1641
+    """Metadata abstraction for the asynchronous calls and interceptors.
+
+    The metadata is a mapping from str -> List[str]
+
+    Traits
+        * Multiple entries are allowed for the same key
+        * The order of the values by key is preserved
+        * Getting by an element by key, retrieves the first mapped value
+        * Supports an immutable view of the data
+        * Allows partial mutation on the data without recreating the new object from scratch.
+    """
+
+    def __init__(self, *args: MetadatumType) -> None:
+        self._metadata = OrderedDict()
+        for md_key, md_value in args:
+            self.add(md_key, md_value)
+
+    @classmethod
+    def from_tuple(cls, raw_metadata: tuple):
+        # Note: We unintentionally support non-tuple arguments here. We plan
+        # to emit a DeprecationWarning when a non-tuple type is used.
+        if raw_metadata:
+            return cls(*raw_metadata)
+        return cls()
+
+    @classmethod
+    def _create(
+        cls,
+        raw_metadata: Union[None, Self, Iterable[MetadatumType]],
+    ) -> Self:
+        # TODO(asheshvidyut): Make this method public and encourage people to use it instead
+        # of `from_tuple` to create metadata from non-tuple types.
+        if raw_metadata is None:
+            return Metadata()
+        if isinstance(raw_metadata, cls):
+            return raw_metadata
+        if raw_metadata:
+            return cls(*raw_metadata)
+        return cls()
+
+    def add(self, key: MetadataKey, value: MetadataValue) -> None:
+        self._metadata.setdefault(key, [])
+        self._metadata[key].append(value)
+
+    def __len__(self) -> int:
+        """Return the total number of elements that there are in the metadata,
+        including multiple values for the same key.
+        """
+        return sum(map(len, self._metadata.values()))
+
+    def __getitem__(self, key: MetadataKey) -> MetadataValue:
+        """When calling <metadata>[<key>], the first element of all those
+        mapped for <key> is returned.
+        """
+        try:
+            return self._metadata[key][0]
+        except (ValueError, IndexError) as e:
+            error_msg = f"{key!r}"
+            raise KeyError(error_msg) from e
+
+    def __setitem__(self, key: MetadataKey, value: MetadataValue) -> None:
+        """Calling metadata[<key>] = <value>
+        Maps <value> to the first instance of <key>.
+        """
+        if key not in self:
+            self._metadata[key] = [value]
+        else:
+            current_values = self.get_all(key)
+            self._metadata[key] = [value, *current_values[1:]]
+
+    def __delitem__(self, key: MetadataKey) -> None:
+        """``del metadata[<key>]`` deletes the first mapping for <key>."""
+        current_values = self.get_all(key)
+        if not current_values:
+            raise KeyError(repr(key))
+        self._metadata[key] = current_values[1:]
+
+    def delete_all(self, key: MetadataKey) -> None:
+        """Delete all mappings for <key>."""
+        del self._metadata[key]
+
+    def __iter__(self) -> Iterator[Tuple[MetadataKey, MetadataValue]]:
+        for key, values in self._metadata.items():
+            for value in values:
+                yield (key, value)
+
+    def keys(self) -> KeysView:
+        return KeysView(self._metadata)
+
+    def values(self) -> ValuesView:
+        return ValuesView(self._metadata)
+
+    def items(self) -> ItemsView:
+        return ItemsView(self._metadata)
+
+    def get(
+        self, key: MetadataKey, default: Optional[MetadataValue] = None
+    ) -> Optional[MetadataValue]:
+        try:
+            return self[key]
+        except KeyError:
+            return default
+
+    def get_all(self, key: MetadataKey) -> List[MetadataValue]:
+        """For compatibility with other Metadata abstraction objects (like in Java),
+        this would return all items under the desired <key>.
+        """
+        return self._metadata.get(key, [])
+
+    def set_all(self, key: MetadataKey, values: List[MetadataValue]) -> None:
+        self._metadata[key] = values
+
+    def __contains__(self, key: MetadataKey) -> bool:
+        return key in self._metadata
+
+    def __eq__(self, other: object) -> bool:
+        if isinstance(other, self.__class__):
+            return self._metadata == other._metadata
+        if isinstance(other, tuple):
+            return tuple(self) == other
+        return NotImplemented  # pytype: disable=bad-return-type
+
+    def __add__(self, other: Any) -> "Metadata":
+        if isinstance(other, self.__class__):
+            return Metadata(*(tuple(self) + tuple(other)))
+        if isinstance(other, tuple):
+            return Metadata(*(tuple(self) + other))
+        return NotImplemented  # pytype: disable=bad-return-type
+
+    def __repr__(self) -> str:
+        view = tuple(self)
+        return "{0}({1!r})".format(self.__class__.__name__, view)

server/venv/lib/python3.9/site-packages/grpc/aio/_server.py

@@ -0,0 +1,241 @@
+# Copyright 2019 The gRPC Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Server-side implementation of gRPC Asyncio Python."""
+
+from concurrent.futures import Executor
+from typing import Any, Dict, Optional, Sequence
+
+import grpc
+from grpc import _common
+from grpc import _compression
+from grpc._cython import cygrpc
+
+from . import _base_server
+from ._interceptor import ServerInterceptor
+from ._typing import ChannelArgumentType
+
+
+def _augment_channel_arguments(
+    base_options: ChannelArgumentType, compression: Optional[grpc.Compression]
+):
+    compression_option = _compression.create_channel_option(compression)
+    return tuple(base_options) + compression_option
+
+
+class Server(_base_server.Server):
+    """Serves RPCs."""
+
+    def __init__(
+        self,
+        thread_pool: Optional[Executor],
+        generic_handlers: Optional[Sequence[grpc.GenericRpcHandler]],
+        interceptors: Optional[Sequence[Any]],
+        options: ChannelArgumentType,
+        maximum_concurrent_rpcs: Optional[int],
+        compression: Optional[grpc.Compression],
+    ):
+        self._loop = cygrpc.get_working_loop()
+        if interceptors:
+            invalid_interceptors = [
+                interceptor
+                for interceptor in interceptors
+                if not isinstance(interceptor, ServerInterceptor)
+            ]
+            if invalid_interceptors:
+                error_msg = (
+                    "Interceptor must be ServerInterceptor,"
+                    "the following are invalid: {invalid_interceptors}"
+                )
+                # TODO(asheshvidyut): fix the value error below
+                # not caught by ruff.
+                raise ValueError(error_msg)
+        self._server = cygrpc.AioServer(
+            self._loop,
+            thread_pool,
+            generic_handlers,
+            interceptors,
+            _augment_channel_arguments(options, compression),
+            maximum_concurrent_rpcs,
+        )
+
+    def add_generic_rpc_handlers(
+        self, generic_rpc_handlers: Sequence[grpc.GenericRpcHandler]
+    ) -> None:
+        """Registers GenericRpcHandlers with this Server.
+
+        This method is only safe to call before the server is started.
+
+        Args:
+          generic_rpc_handlers: A sequence of GenericRpcHandlers that will be
+          used to service RPCs.
+        """
+        self._server.add_generic_rpc_handlers(generic_rpc_handlers)
+
+    def add_registered_method_handlers(
+        self,
+        service_name: str,
+        method_handlers: Dict[str, grpc.RpcMethodHandler],
+    ) -> None:
+        # TODO(xuanwn): Implement this for AsyncIO.
+        pass
+
+    def add_insecure_port(self, address: str) -> int:
+        """Opens an insecure port for accepting RPCs.
+
+        This method may only be called before starting the server.
+
+        Args:
+          address: The address for which to open a port. If the port is 0,
+            or not specified in the address, then the gRPC runtime will choose a port.
+
+        Returns:
+          An integer port on which the server will accept RPC requests.
+        """
+        return _common.validate_port_binding_result(
+            address, self._server.add_insecure_port(_common.encode(address))
+        )
+
+    def add_secure_port(
+        self, address: str, server_credentials: grpc.ServerCredentials
+    ) -> int:
+        """Opens a secure port for accepting RPCs.
+
+        This method may only be called before starting the server.
+
+        Args:
+          address: The address for which to open a port.
+            if the port is 0, or not specified in the address, then the gRPC
+            runtime will choose a port.
+          server_credentials: A ServerCredentials object.
+
+        Returns:
+          An integer port on which the server will accept RPC requests.
+        """
+        return _common.validate_port_binding_result(
+            address,
+            self._server.add_secure_port(
+                _common.encode(address), server_credentials
+            ),
+        )
+
+    async def start(self) -> None:
+        """Starts this Server.
+
+        This method may only be called once. (i.e. it is not idempotent).
+        """
+        await self._server.start()
+
+    async def stop(self, grace: Optional[float]) -> None:
+        """Stops this Server.
+
+        This method immediately stops the server from servicing new RPCs in
+        all cases.
+
+        If a grace period is specified, this method waits until all active
+        RPCs are finished or until the grace period is reached. RPCs that haven't
+        been terminated within the grace period are aborted.
+        If a grace period is not specified (by passing None for grace), all
+        existing RPCs are aborted immediately and this method blocks until
+        the last RPC handler terminates.
+
+        This method is idempotent and may be called at any time. Passing a
+        smaller grace value in a subsequent call will have the effect of
+        stopping the Server sooner (passing None will have the effect of
+        stopping the server immediately). Passing a larger grace value in a
+        subsequent call will not have the effect of stopping the server later
+        (i.e. the most restrictive grace value is used).
+
+        Args:
+          grace: A duration of time in seconds or None.
+        """
+        await self._server.shutdown(grace)
+
+    async def wait_for_termination(
+        self, timeout: Optional[float] = None
+    ) -> bool:
+        """Block current coroutine until the server stops.
+
+        This is an EXPERIMENTAL API.
+
+        The wait will not consume computational resources during blocking, and
+        it will block until one of the two following conditions are met:
+
+        1) The server is stopped or terminated;
+        2) A timeout occurs if timeout is not `None`.
+
+        The timeout argument works in the same way as `threading.Event.wait()`.
+        https://docs.python.org/3/library/threading.html#threading.Event.wait
+
+        Args:
+          timeout: A floating point number specifying a timeout for the
+            operation in seconds.
+
+        Returns:
+          A bool indicates if the operation times out.
+        """
+        return await self._server.wait_for_termination(timeout)
+
+    def __del__(self):
+        """Schedules a graceful shutdown in current event loop.
+
+        The Cython AioServer doesn't hold a ref-count to this class. It should
+        be safe to slightly extend the underlying Cython object's life span.
+        """
+        if hasattr(self, "_server") and self._server.is_running():
+            cygrpc.schedule_coro_threadsafe(
+                self._server.shutdown(None),
+                self._loop,
+            )
+
+
+def server(
+    migration_thread_pool: Optional[Executor] = None,
+    handlers: Optional[Sequence[grpc.GenericRpcHandler]] = None,
+    interceptors: Optional[Sequence[Any]] = None,
+    options: Optional[ChannelArgumentType] = None,
+    maximum_concurrent_rpcs: Optional[int] = None,
+    compression: Optional[grpc.Compression] = None,
+):
+    """Creates a Server with which RPCs can be serviced.
+
+    Args:
+      migration_thread_pool: A futures.ThreadPoolExecutor to be used by the
+        Server to execute non-AsyncIO RPC handlers for migration purpose.
+      handlers: An optional list of GenericRpcHandlers used for executing RPCs.
+        More handlers may be added by calling add_generic_rpc_handlers any time
+        before the server is started.
+      interceptors: An optional list of ServerInterceptor objects that observe
+        and optionally manipulate the incoming RPCs before handing them over to
+        handlers. The interceptors are given control in the order they are
+        specified. This is an EXPERIMENTAL API.
+      options: An optional list of key-value pairs (:term:`channel_arguments` in gRPC runtime)
+        to configure the channel.
+      maximum_concurrent_rpcs: The maximum number of concurrent RPCs this server
+        will service before returning RESOURCE_EXHAUSTED status, or None to
+        indicate no limit.
+      compression: An element of grpc.Compression, e.g.
+        grpc.Compression.Gzip. This compression algorithm will be used for the
+        lifetime of the server unless overridden by set_compression.
+
+    Returns:
+      A Server object.
+    """
+    return Server(
+        migration_thread_pool,
+        () if handlers is None else handlers,
+        () if interceptors is None else interceptors,
+        () if options is None else options,
+        maximum_concurrent_rpcs,
+        compression,
+    )

server/venv/lib/python3.9/site-packages/grpc/aio/_typing.py

@@ -0,0 +1,46 @@
+# Copyright 2019 The gRPC Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Common types for gRPC Async API"""
+
+from typing import (
+    Any,
+    AsyncIterable,
+    Callable,
+    Iterable,
+    Sequence,
+    Tuple,
+    TypeVar,
+    Union,
+)
+
+from grpc._cython.cygrpc import EOF
+
+# pylint: disable=unused-import
+from ._metadata import Metadata
+from ._metadata import MetadataKey
+from ._metadata import MetadataType
+from ._metadata import MetadataValue
+from ._metadata import MetadatumType
+
+# pylint: enable=unused-import
+
+RequestType = TypeVar("RequestType")
+ResponseType = TypeVar("ResponseType")
+SerializingFunction = Callable[[Any], bytes]
+DeserializingFunction = Callable[[bytes], Any]
+ChannelArgumentType = Sequence[Tuple[str, Any]]
+EOFType = type(EOF)
+DoneCallbackType = Callable[[Any], None]
+RequestIterableType = Union[Iterable[Any], AsyncIterable[Any]]
+ResponseIterableType = AsyncIterable[Any]

server/venv/lib/python3.9/site-packages/grpc/aio/_utils.py

@@ -0,0 +1,22 @@
+# Copyright 2019 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Internal utilities used by the gRPC Aio module."""
+import time
+from typing import Optional
+
+
+def _timeout_to_deadline(timeout: Optional[float]) -> Optional[float]:
+    if timeout is None:
+        return None
+    return time.time() + timeout

server/venv/lib/python3.9/site-packages/grpc/beta/__init__.py

@@ -0,0 +1,13 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

server/venv/lib/python3.9/site-packages/grpc/beta/_metadata.py

@@ -0,0 +1,54 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""API metadata conversion utilities."""
+
+import collections
+
+_Metadatum = collections.namedtuple(
+    "_Metadatum",
+    (
+        "key",
+        "value",
+    ),
+)
+
+
+def _beta_metadatum(key, value):
+    beta_key = key if isinstance(key, (bytes,)) else key.encode("ascii")
+    beta_value = value if isinstance(value, (bytes,)) else value.encode("ascii")
+    return _Metadatum(beta_key, beta_value)
+
+
+def _metadatum(beta_key, beta_value):
+    key = beta_key if isinstance(beta_key, (str,)) else beta_key.decode("utf8")
+    if isinstance(beta_value, (str,)) or key[-4:] == "-bin":
+        value = beta_value
+    else:
+        value = beta_value.decode("utf8")
+    return _Metadatum(key, value)
+
+
+def beta(metadata):
+    if metadata is None:
+        return ()
+    return tuple(_beta_metadatum(key, value) for key, value in metadata)
+
+
+def unbeta(beta_metadata):
+    if beta_metadata is None:
+        return ()
+    return tuple(
+        _metadatum(beta_key, beta_value)
+        for beta_key, beta_value in beta_metadata
+    )

server/venv/lib/python3.9/site-packages/grpc/beta/_server_adaptations.py

@@ -0,0 +1,457 @@
+# Copyright 2016 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Translates gRPC's server-side API into gRPC's server-side Beta API."""
+
+import collections
+import threading
+
+import grpc
+from grpc import _common
+from grpc.beta import _metadata
+from grpc.beta import interfaces
+from grpc.framework.common import cardinality
+from grpc.framework.common import style
+from grpc.framework.foundation import abandonment
+from grpc.framework.foundation import logging_pool
+from grpc.framework.foundation import stream
+from grpc.framework.interfaces.face import face
+
+# pylint: disable=too-many-return-statements
+
+_DEFAULT_POOL_SIZE = 8
+
+
+class _ServerProtocolContext(interfaces.GRPCServicerContext):
+    def __init__(self, servicer_context):
+        self._servicer_context = servicer_context
+
+    def peer(self):
+        return self._servicer_context.peer()
+
+    def disable_next_response_compression(self):
+        pass  # TODO(https://github.com/grpc/grpc/issues/4078): design, implement.
+
+
+class _FaceServicerContext(face.ServicerContext):
+    def __init__(self, servicer_context):
+        self._servicer_context = servicer_context
+
+    def is_active(self):
+        return self._servicer_context.is_active()
+
+    def time_remaining(self):
+        return self._servicer_context.time_remaining()
+
+    def add_abortion_callback(self, abortion_callback):
+        error_msg = "add_abortion_callback no longer supported server-side!"
+        raise NotImplementedError(error_msg)
+
+    def cancel(self):
+        self._servicer_context.cancel()
+
+    def protocol_context(self):
+        return _ServerProtocolContext(self._servicer_context)
+
+    def invocation_metadata(self):
+        return _metadata.beta(self._servicer_context.invocation_metadata())
+
+    def initial_metadata(self, initial_metadata):
+        self._servicer_context.send_initial_metadata(
+            _metadata.unbeta(initial_metadata)
+        )
+
+    def terminal_metadata(self, terminal_metadata):
+        self._servicer_context.set_terminal_metadata(
+            _metadata.unbeta(terminal_metadata)
+        )
+
+    def code(self, code):
+        self._servicer_context.set_code(code)
+
+    def details(self, details):
+        self._servicer_context.set_details(details)
+
+
+def _adapt_unary_request_inline(unary_request_inline):
+    def adaptation(request, servicer_context):
+        return unary_request_inline(
+            request, _FaceServicerContext(servicer_context)
+        )
+
+    return adaptation
+
+
+def _adapt_stream_request_inline(stream_request_inline):
+    def adaptation(request_iterator, servicer_context):
+        return stream_request_inline(
+            request_iterator, _FaceServicerContext(servicer_context)
+        )
+
+    return adaptation
+
+
+class _Callback(stream.Consumer):
+    def __init__(self):
+        self._condition = threading.Condition()
+        self._values = []
+        self._terminated = False
+        self._cancelled = False
+
+    def consume(self, value):
+        with self._condition:
+            self._values.append(value)
+            self._condition.notify_all()
+
+    def terminate(self):
+        with self._condition:
+            self._terminated = True
+            self._condition.notify_all()
+
+    def consume_and_terminate(self, value):
+        with self._condition:
+            self._values.append(value)
+            self._terminated = True
+            self._condition.notify_all()
+
+    def cancel(self):
+        with self._condition:
+            self._cancelled = True
+            self._condition.notify_all()
+
+    def draw_one_value(self):
+        with self._condition:
+            while True:
+                if self._cancelled:
+                    raise abandonment.Abandoned()
+                if self._values:
+                    return self._values.pop(0)
+                if self._terminated:
+                    return None
+                self._condition.wait()
+
+    def draw_all_values(self):
+        with self._condition:
+            while True:
+                if self._cancelled:
+                    raise abandonment.Abandoned()
+                if self._terminated:
+                    all_values = tuple(self._values)
+                    self._values = None
+                    return all_values
+                self._condition.wait()
+
+
+def _run_request_pipe_thread(
+    request_iterator, request_consumer, servicer_context
+):
+    thread_joined = threading.Event()
+
+    def pipe_requests():
+        for request in request_iterator:
+            if not servicer_context.is_active() or thread_joined.is_set():
+                return
+            request_consumer.consume(request)
+            if not servicer_context.is_active() or thread_joined.is_set():
+                return
+        request_consumer.terminate()
+
+    request_pipe_thread = threading.Thread(target=pipe_requests)
+    request_pipe_thread.daemon = True
+    request_pipe_thread.start()
+
+
+def _adapt_unary_unary_event(unary_unary_event):
+    def adaptation(request, servicer_context):
+        callback = _Callback()
+        if not servicer_context.add_callback(callback.cancel):
+            raise abandonment.Abandoned()
+        unary_unary_event(
+            request,
+            callback.consume_and_terminate,
+            _FaceServicerContext(servicer_context),
+        )
+        return callback.draw_all_values()[0]
+
+    return adaptation
+
+
+def _adapt_unary_stream_event(unary_stream_event):
+    def adaptation(request, servicer_context):
+        callback = _Callback()
+        if not servicer_context.add_callback(callback.cancel):
+            raise abandonment.Abandoned()
+        unary_stream_event(
+            request, callback, _FaceServicerContext(servicer_context)
+        )
+        while True:
+            response = callback.draw_one_value()
+            if response is None:
+                return
+            else:
+                yield response
+
+    return adaptation
+
+
+def _adapt_stream_unary_event(stream_unary_event):
+    def adaptation(request_iterator, servicer_context):
+        callback = _Callback()
+        if not servicer_context.add_callback(callback.cancel):
+            raise abandonment.Abandoned()
+        request_consumer = stream_unary_event(
+            callback.consume_and_terminate,
+            _FaceServicerContext(servicer_context),
+        )
+        _run_request_pipe_thread(
+            request_iterator, request_consumer, servicer_context
+        )
+        return callback.draw_all_values()[0]
+
+    return adaptation
+
+
+def _adapt_stream_stream_event(stream_stream_event):
+    def adaptation(request_iterator, servicer_context):
+        callback = _Callback()
+        if not servicer_context.add_callback(callback.cancel):
+            raise abandonment.Abandoned()
+        request_consumer = stream_stream_event(
+            callback, _FaceServicerContext(servicer_context)
+        )
+        _run_request_pipe_thread(
+            request_iterator, request_consumer, servicer_context
+        )
+        while True:
+            response = callback.draw_one_value()
+            if response is None:
+                return
+            else:
+                yield response
+
+    return adaptation
+
+
+class _SimpleMethodHandler(
+    collections.namedtuple(
+        "_MethodHandler",
+        (
+            "request_streaming",
+            "response_streaming",
+            "request_deserializer",
+            "response_serializer",
+            "unary_unary",
+            "unary_stream",
+            "stream_unary",
+            "stream_stream",
+        ),
+    ),
+    grpc.RpcMethodHandler,
+):
+    pass
+
+
+def _simple_method_handler(  # noqa: PLR0911
+    implementation, request_deserializer, response_serializer
+):
+    if implementation.style is style.Service.INLINE:
+        if implementation.cardinality is cardinality.Cardinality.UNARY_UNARY:
+            return _SimpleMethodHandler(
+                False,
+                False,
+                request_deserializer,
+                response_serializer,
+                _adapt_unary_request_inline(implementation.unary_unary_inline),
+                None,
+                None,
+                None,
+            )
+        if implementation.cardinality is cardinality.Cardinality.UNARY_STREAM:
+            return _SimpleMethodHandler(
+                False,
+                True,
+                request_deserializer,
+                response_serializer,
+                None,
+                _adapt_unary_request_inline(implementation.unary_stream_inline),
+                None,
+                None,
+            )
+        if implementation.cardinality is cardinality.Cardinality.STREAM_UNARY:
+            return _SimpleMethodHandler(
+                True,
+                False,
+                request_deserializer,
+                response_serializer,
+                None,
+                None,
+                _adapt_stream_request_inline(
+                    implementation.stream_unary_inline
+                ),
+                None,
+            )
+        if implementation.cardinality is cardinality.Cardinality.STREAM_STREAM:
+            return _SimpleMethodHandler(
+                True,
+                True,
+                request_deserializer,
+                response_serializer,
+                None,
+                None,
+                None,
+                _adapt_stream_request_inline(
+                    implementation.stream_stream_inline
+                ),
+            )
+    elif implementation.style is style.Service.EVENT:
+        if implementation.cardinality is cardinality.Cardinality.UNARY_UNARY:
+            return _SimpleMethodHandler(
+                False,
+                False,
+                request_deserializer,
+                response_serializer,
+                _adapt_unary_unary_event(implementation.unary_unary_event),
+                None,
+                None,
+                None,
+            )
+        if implementation.cardinality is cardinality.Cardinality.UNARY_STREAM:
+            return _SimpleMethodHandler(
+                False,
+                True,
+                request_deserializer,
+                response_serializer,
+                None,
+                _adapt_unary_stream_event(implementation.unary_stream_event),
+                None,
+                None,
+            )
+        if implementation.cardinality is cardinality.Cardinality.STREAM_UNARY:
+            return _SimpleMethodHandler(
+                True,
+                False,
+                request_deserializer,
+                response_serializer,
+                None,
+                None,
+                _adapt_stream_unary_event(implementation.stream_unary_event),
+                None,
+            )
+        if implementation.cardinality is cardinality.Cardinality.STREAM_STREAM:
+            return _SimpleMethodHandler(
+                True,
+                True,
+                request_deserializer,
+                response_serializer,
+                None,
+                None,
+                None,
+                _adapt_stream_stream_event(implementation.stream_stream_event),
+            )
+    raise ValueError()
+
+
+def _flatten_method_pair_map(method_pair_map):
+    method_pair_map = method_pair_map or {}
+    flat_map = {}
+    for method_pair in method_pair_map:
+        method = _common.fully_qualified_method(method_pair[0], method_pair[1])
+        flat_map[method] = method_pair_map[method_pair]
+    return flat_map
+
+
+class _GenericRpcHandler(grpc.GenericRpcHandler):
+    def __init__(
+        self,
+        method_implementations,
+        multi_method_implementation,
+        request_deserializers,
+        response_serializers,
+    ):
+        self._method_implementations = _flatten_method_pair_map(
+            method_implementations
+        )
+        self._request_deserializers = _flatten_method_pair_map(
+            request_deserializers
+        )
+        self._response_serializers = _flatten_method_pair_map(
+            response_serializers
+        )
+        self._multi_method_implementation = multi_method_implementation
+
+    def service(self, handler_call_details):
+        method_implementation = self._method_implementations.get(
+            handler_call_details.method
+        )
+        if method_implementation is not None:
+            return _simple_method_handler(
+                method_implementation,
+                self._request_deserializers.get(handler_call_details.method),
+                self._response_serializers.get(handler_call_details.method),
+            )
+        if self._multi_method_implementation is None:
+            return None
+        try:
+            return None  # TODO(nathaniel): call the multimethod.
+        except face.NoSuchMethodError:
+            return None
+
+
+class _Server(interfaces.Server):
+    def __init__(self, grpc_server):
+        self._grpc_server = grpc_server
+
+    def add_insecure_port(self, address):
+        return self._grpc_server.add_insecure_port(address)
+
+    def add_secure_port(self, address, server_credentials):
+        return self._grpc_server.add_secure_port(address, server_credentials)
+
+    def start(self):
+        self._grpc_server.start()
+
+    def stop(self, grace):
+        return self._grpc_server.stop(grace)
+
+    def __enter__(self):
+        self._grpc_server.start()
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self._grpc_server.stop(None)
+        return False
+
+
+def server(
+    service_implementations,
+    multi_method_implementation,
+    request_deserializers,
+    response_serializers,
+    thread_pool,
+    thread_pool_size,
+):
+    generic_rpc_handler = _GenericRpcHandler(
+        service_implementations,
+        multi_method_implementation,
+        request_deserializers,
+        response_serializers,
+    )
+    if thread_pool is None:
+        effective_thread_pool = logging_pool.pool(
+            _DEFAULT_POOL_SIZE if thread_pool_size is None else thread_pool_size
+        )
+    else:
+        effective_thread_pool = thread_pool
+    return _Server(
+        grpc.server(effective_thread_pool, handlers=(generic_rpc_handler,))
+    )

server/venv/lib/python3.9/site-packages/grpc/beta/implementations.py

@@ -0,0 +1,345 @@
+# Copyright 2015-2016 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Entry points into the Beta API of gRPC Python."""
+
+# threading is referenced from specification in this module.
+import threading  # pylint: disable=unused-import
+
+# interfaces, cardinality, and face are referenced from specification in this
+# module.
+import grpc
+from grpc import _auth
+from grpc.beta import _client_adaptations
+from grpc.beta import _metadata
+from grpc.beta import _server_adaptations
+from grpc.beta import interfaces  # pylint: disable=unused-import
+from grpc.framework.common import cardinality  # pylint: disable=unused-import
+from grpc.framework.interfaces.face import face  # pylint: disable=unused-import
+
+# pylint: disable=too-many-arguments
+
+ChannelCredentials = grpc.ChannelCredentials
+ssl_channel_credentials = grpc.ssl_channel_credentials
+CallCredentials = grpc.CallCredentials
+
+
+def metadata_call_credentials(metadata_plugin, name=None):
+    def plugin(context, callback):
+        def wrapped_callback(beta_metadata, error):
+            callback(_metadata.unbeta(beta_metadata), error)
+
+        metadata_plugin(context, wrapped_callback)
+
+    return grpc.metadata_call_credentials(plugin, name=name)
+
+
+def google_call_credentials(credentials):
+    """Construct CallCredentials from GoogleCredentials.
+
+    Args:
+      credentials: A GoogleCredentials object from the oauth2client library.
+
+    Returns:
+      A CallCredentials object for use in a GRPCCallOptions object.
+    """
+    return metadata_call_credentials(_auth.GoogleCallCredentials(credentials))
+
+
+access_token_call_credentials = grpc.access_token_call_credentials
+composite_call_credentials = grpc.composite_call_credentials
+composite_channel_credentials = grpc.composite_channel_credentials
+
+
+class Channel(object):
+    """A channel to a remote host through which RPCs may be conducted.
+
+    Only the "subscribe" and "unsubscribe" methods are supported for application
+    use. This class' instance constructor and all other attributes are
+    unsupported.
+    """
+
+    def __init__(self, channel):
+        self._channel = channel
+
+    def subscribe(self, callback, try_to_connect=None):
+        """Subscribes to this Channel's connectivity.
+
+        Args:
+          callback: A callable to be invoked and passed an
+            interfaces.ChannelConnectivity identifying this Channel's connectivity.
+            The callable will be invoked immediately upon subscription and again for
+            every change to this Channel's connectivity thereafter until it is
+            unsubscribed.
+          try_to_connect: A boolean indicating whether or not this Channel should
+            attempt to connect if it is not already connected and ready to conduct
+            RPCs.
+        """
+        self._channel.subscribe(callback, try_to_connect=try_to_connect)
+
+    def unsubscribe(self, callback):
+        """Unsubscribes a callback from this Channel's connectivity.
+
+        Args:
+          callback: A callable previously registered with this Channel from having
+            been passed to its "subscribe" method.
+        """
+        self._channel.unsubscribe(callback)
+
+
+def insecure_channel(host, port):
+    """Creates an insecure Channel to a remote host.
+
+    Args:
+      host: The name of the remote host to which to connect.
+      port: The port of the remote host to which to connect.
+        If None only the 'host' part will be used.
+
+    Returns:
+      A Channel to the remote host through which RPCs may be conducted.
+    """
+    channel = grpc.insecure_channel(
+        host if port is None else "%s:%d" % (host, port)
+    )
+    return Channel(channel)
+
+
+def secure_channel(host, port, channel_credentials):
+    """Creates a secure Channel to a remote host.
+
+    Args:
+      host: The name of the remote host to which to connect.
+      port: The port of the remote host to which to connect.
+        If None only the 'host' part will be used.
+      channel_credentials: A ChannelCredentials.
+
+    Returns:
+      A secure Channel to the remote host through which RPCs may be conducted.
+    """
+    channel = grpc.secure_channel(
+        host if port is None else "%s:%d" % (host, port), channel_credentials
+    )
+    return Channel(channel)
+
+
+class StubOptions(object):
+    """A value encapsulating the various options for creation of a Stub.
+
+    This class and its instances have no supported interface - it exists to define
+    the type of its instances and its instances exist to be passed to other
+    functions.
+    """
+
+    def __init__(
+        self,
+        host,
+        request_serializers,
+        response_deserializers,
+        metadata_transformer,
+        thread_pool,
+        thread_pool_size,
+    ):
+        self.host = host
+        self.request_serializers = request_serializers
+        self.response_deserializers = response_deserializers
+        self.metadata_transformer = metadata_transformer
+        self.thread_pool = thread_pool
+        self.thread_pool_size = thread_pool_size
+
+
+_EMPTY_STUB_OPTIONS = StubOptions(None, None, None, None, None, None)
+
+
+def stub_options(
+    host=None,
+    request_serializers=None,
+    response_deserializers=None,
+    metadata_transformer=None,
+    thread_pool=None,
+    thread_pool_size=None,
+):
+    """Creates a StubOptions value to be passed at stub creation.
+
+    All parameters are optional and should always be passed by keyword.
+
+    Args:
+      host: A host string to set on RPC calls.
+      request_serializers: A dictionary from service name-method name pair to
+        request serialization behavior.
+      response_deserializers: A dictionary from service name-method name pair to
+        response deserialization behavior.
+      metadata_transformer: A callable that given a metadata object produces
+        another metadata object to be used in the underlying communication on the
+        wire.
+      thread_pool: A thread pool to use in stubs.
+      thread_pool_size: The size of thread pool to create for use in stubs;
+        ignored if thread_pool has been passed.
+
+    Returns:
+      A StubOptions value created from the passed parameters.
+    """
+    return StubOptions(
+        host,
+        request_serializers,
+        response_deserializers,
+        metadata_transformer,
+        thread_pool,
+        thread_pool_size,
+    )
+
+
+def generic_stub(channel, options=None):
+    """Creates a face.GenericStub on which RPCs can be made.
+
+    Args:
+      channel: A Channel for use by the created stub.
+      options: A StubOptions customizing the created stub.
+
+    Returns:
+      A face.GenericStub on which RPCs can be made.
+    """
+    effective_options = _EMPTY_STUB_OPTIONS if options is None else options
+    return _client_adaptations.generic_stub(
+        channel._channel,  # pylint: disable=protected-access
+        effective_options.host,
+        effective_options.metadata_transformer,
+        effective_options.request_serializers,
+        effective_options.response_deserializers,
+    )
+
+
+def dynamic_stub(channel, service, cardinalities, options=None):
+    """Creates a face.DynamicStub with which RPCs can be invoked.
+
+    Args:
+      channel: A Channel for the returned face.DynamicStub to use.
+      service: The package-qualified full name of the service.
+      cardinalities: A dictionary from RPC method name to cardinality.Cardinality
+        value identifying the cardinality of the RPC method.
+      options: An optional StubOptions value further customizing the functionality
+        of the returned face.DynamicStub.
+
+    Returns:
+      A face.DynamicStub with which RPCs can be invoked.
+    """
+    effective_options = _EMPTY_STUB_OPTIONS if options is None else options
+    return _client_adaptations.dynamic_stub(
+        channel._channel,  # pylint: disable=protected-access
+        service,
+        cardinalities,
+        effective_options.host,
+        effective_options.metadata_transformer,
+        effective_options.request_serializers,
+        effective_options.response_deserializers,
+    )
+
+
+ServerCredentials = grpc.ServerCredentials
+ssl_server_credentials = grpc.ssl_server_credentials
+
+
+class ServerOptions(object):
+    """A value encapsulating the various options for creation of a Server.
+
+    This class and its instances have no supported interface - it exists to define
+    the type of its instances and its instances exist to be passed to other
+    functions.
+    """
+
+    def __init__(
+        self,
+        multi_method_implementation,
+        request_deserializers,
+        response_serializers,
+        thread_pool,
+        thread_pool_size,
+        default_timeout,
+        maximum_timeout,
+    ):
+        self.multi_method_implementation = multi_method_implementation
+        self.request_deserializers = request_deserializers
+        self.response_serializers = response_serializers
+        self.thread_pool = thread_pool
+        self.thread_pool_size = thread_pool_size
+        self.default_timeout = default_timeout
+        self.maximum_timeout = maximum_timeout
+
+
+_EMPTY_SERVER_OPTIONS = ServerOptions(None, None, None, None, None, None, None)
+
+
+def server_options(
+    multi_method_implementation=None,
+    request_deserializers=None,
+    response_serializers=None,
+    thread_pool=None,
+    thread_pool_size=None,
+    default_timeout=None,
+    maximum_timeout=None,
+):
+    """Creates a ServerOptions value to be passed at server creation.
+
+    All parameters are optional and should always be passed by keyword.
+
+    Args:
+      multi_method_implementation: A face.MultiMethodImplementation to be called
+        to service an RPC if the server has no specific method implementation for
+        the name of the RPC for which service was requested.
+      request_deserializers: A dictionary from service name-method name pair to
+        request deserialization behavior.
+      response_serializers: A dictionary from service name-method name pair to
+        response serialization behavior.
+      thread_pool: A thread pool to use in stubs.
+      thread_pool_size: The size of thread pool to create for use in stubs;
+        ignored if thread_pool has been passed.
+      default_timeout: A duration in seconds to allow for RPC service when
+        servicing RPCs that did not include a timeout value when invoked.
+      maximum_timeout: A duration in seconds to allow for RPC service when
+        servicing RPCs no matter what timeout value was passed when the RPC was
+        invoked.
+
+    Returns:
+      A StubOptions value created from the passed parameters.
+    """
+    return ServerOptions(
+        multi_method_implementation,
+        request_deserializers,
+        response_serializers,
+        thread_pool,
+        thread_pool_size,
+        default_timeout,
+        maximum_timeout,
+    )
+
+
+def server(service_implementations, options=None):
+    """Creates an interfaces.Server with which RPCs can be serviced.
+
+    Args:
+      service_implementations: A dictionary from service name-method name pair to
+        face.MethodImplementation.
+      options: An optional ServerOptions value further customizing the
+        functionality of the returned Server.
+
+    Returns:
+      An interfaces.Server with which RPCs can be serviced.
+    """
+    effective_options = _EMPTY_SERVER_OPTIONS if options is None else options
+    return _server_adaptations.server(
+        service_implementations,
+        effective_options.multi_method_implementation,
+        effective_options.request_deserializers,
+        effective_options.response_serializers,
+        effective_options.thread_pool,
+        effective_options.thread_pool_size,
+    )

server/venv/lib/python3.9/site-packages/grpc/beta/interfaces.py

@@ -0,0 +1,163 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Constants and interfaces of the Beta API of gRPC Python."""
+
+import abc
+
+import grpc
+
+ChannelConnectivity = grpc.ChannelConnectivity
+# FATAL_FAILURE was a Beta-API name for SHUTDOWN
+ChannelConnectivity.FATAL_FAILURE = ChannelConnectivity.SHUTDOWN
+
+StatusCode = grpc.StatusCode
+
+
+class GRPCCallOptions(object):
+    """A value encapsulating gRPC-specific options passed on RPC invocation.
+
+    This class and its instances have no supported interface - it exists to
+    define the type of its instances and its instances exist to be passed to
+    other functions.
+    """
+
+    def __init__(self, disable_compression, subcall_of, credentials):
+        self.disable_compression = disable_compression
+        self.subcall_of = subcall_of
+        self.credentials = credentials
+
+
+def grpc_call_options(disable_compression=False, credentials=None):
+    """Creates a GRPCCallOptions value to be passed at RPC invocation.
+
+    All parameters are optional and should always be passed by keyword.
+
+    Args:
+      disable_compression: A boolean indicating whether or not compression should
+        be disabled for the request object of the RPC. Only valid for
+        request-unary RPCs.
+      credentials: A CallCredentials object to use for the invoked RPC.
+    """
+    return GRPCCallOptions(disable_compression, None, credentials)
+
+
+GRPCAuthMetadataContext = grpc.AuthMetadataContext
+GRPCAuthMetadataPluginCallback = grpc.AuthMetadataPluginCallback
+GRPCAuthMetadataPlugin = grpc.AuthMetadataPlugin
+
+
+class GRPCServicerContext(abc.ABC):
+    """Exposes gRPC-specific options and behaviors to code servicing RPCs."""
+
+    @abc.abstractmethod
+    def peer(self):
+        """Identifies the peer that invoked the RPC being serviced.
+
+        Returns:
+          A string identifying the peer that invoked the RPC being serviced.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def disable_next_response_compression(self):
+        """Disables compression of the next response passed by the application."""
+        raise NotImplementedError()
+
+
+class GRPCInvocationContext(abc.ABC):
+    """Exposes gRPC-specific options and behaviors to code invoking RPCs."""
+
+    @abc.abstractmethod
+    def disable_next_request_compression(self):
+        """Disables compression of the next request passed by the application."""
+        raise NotImplementedError()
+
+
+class Server(abc.ABC):
+    """Services RPCs."""
+
+    @abc.abstractmethod
+    def add_insecure_port(self, address):
+        """Reserves a port for insecure RPC service once this Server becomes active.
+
+        This method may only be called before calling this Server's start method is
+        called.
+
+        Args:
+          address: The address for which to open a port.
+
+        Returns:
+          An integer port on which RPCs will be serviced after this link has been
+            started. This is typically the same number as the port number contained
+            in the passed address, but will likely be different if the port number
+            contained in the passed address was zero.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def add_secure_port(self, address, server_credentials):
+        """Reserves a port for secure RPC service after this Server becomes active.
+
+        This method may only be called before calling this Server's start method is
+        called.
+
+        Args:
+          address: The address for which to open a port.
+          server_credentials: A ServerCredentials.
+
+        Returns:
+          An integer port on which RPCs will be serviced after this link has been
+            started. This is typically the same number as the port number contained
+            in the passed address, but will likely be different if the port number
+            contained in the passed address was zero.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def start(self):
+        """Starts this Server's service of RPCs.
+
+        This method may only be called while the server is not serving RPCs (i.e. it
+        is not idempotent).
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def stop(self, grace):
+        """Stops this Server's service of RPCs.
+
+        All calls to this method immediately stop service of new RPCs. When existing
+        RPCs are aborted is controlled by the grace period parameter passed to this
+        method.
+
+        This method may be called at any time and is idempotent. Passing a smaller
+        grace value than has been passed in a previous call will have the effect of
+        stopping the Server sooner. Passing a larger grace value than has been
+        passed in a previous call will not have the effect of stopping the server
+        later.
+
+        Args:
+          grace: A duration of time in seconds to allow existing RPCs to complete
+            before being aborted by this Server's stopping. May be zero for
+            immediate abortion of all in-progress RPCs.
+
+        Returns:
+          A threading.Event that will be set when this Server has completely
+          stopped. The returned event may not be set until after the full grace
+          period (if some ongoing RPC continues for the full length of the period)
+          of it may be set much sooner (such as if this Server had no RPCs underway
+          at the time it was stopped or if all RPCs that it had underway completed
+          very early in the grace period).
+        """
+        raise NotImplementedError()

server/venv/lib/python3.9/site-packages/grpc/beta/utilities.py

@@ -0,0 +1,148 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Utilities for the gRPC Python Beta API."""
+
+import threading
+import time
+
+# implementations is referenced from specification in this module.
+from grpc.beta import implementations  # pylint: disable=unused-import
+from grpc.beta import interfaces
+from grpc.framework.foundation import callable_util
+from grpc.framework.foundation import future
+
+_DONE_CALLBACK_EXCEPTION_LOG_MESSAGE = (
+    'Exception calling connectivity future "done" callback!'
+)
+
+
+class _ChannelReadyFuture(future.Future):
+    def __init__(self, channel):
+        self._condition = threading.Condition()
+        self._channel = channel
+
+        self._matured = False
+        self._cancelled = False
+        self._done_callbacks = []
+
+    def _block(self, timeout):
+        until = None if timeout is None else time.time() + timeout
+        with self._condition:
+            while True:
+                if self._cancelled:
+                    raise future.CancelledError()
+                if self._matured:
+                    return
+                if until is None:
+                    self._condition.wait()
+                else:
+                    remaining = until - time.time()
+                    if remaining < 0:
+                        raise future.TimeoutError()
+                    self._condition.wait(timeout=remaining)
+
+    def _update(self, connectivity):
+        with self._condition:
+            if (
+                not self._cancelled
+                and connectivity is interfaces.ChannelConnectivity.READY
+            ):
+                self._matured = True
+                self._channel.unsubscribe(self._update)
+                self._condition.notify_all()
+                done_callbacks = tuple(self._done_callbacks)
+                self._done_callbacks = None
+            else:
+                return
+
+        for done_callback in done_callbacks:
+            callable_util.call_logging_exceptions(
+                done_callback, _DONE_CALLBACK_EXCEPTION_LOG_MESSAGE, self
+            )
+
+    def cancel(self):
+        with self._condition:
+            if not self._matured:
+                self._cancelled = True
+                self._channel.unsubscribe(self._update)
+                self._condition.notify_all()
+                done_callbacks = tuple(self._done_callbacks)
+                self._done_callbacks = None
+            else:
+                return False
+
+        for done_callback in done_callbacks:
+            callable_util.call_logging_exceptions(
+                done_callback, _DONE_CALLBACK_EXCEPTION_LOG_MESSAGE, self
+            )
+
+        return True
+
+    def cancelled(self):
+        with self._condition:
+            return self._cancelled
+
+    def running(self):
+        with self._condition:
+            return not self._cancelled and not self._matured
+
+    def done(self):
+        with self._condition:
+            return self._cancelled or self._matured
+
+    def result(self, timeout=None):
+        self._block(timeout)
+
+    def exception(self, timeout=None):
+        self._block(timeout)
+
+    def traceback(self, timeout=None):
+        self._block(timeout)
+
+    def add_done_callback(self, fn):
+        with self._condition:
+            if not self._cancelled and not self._matured:
+                self._done_callbacks.append(fn)
+                return
+
+        fn(self)
+
+    def start(self):
+        with self._condition:
+            self._channel.subscribe(self._update, try_to_connect=True)
+
+    def __del__(self):
+        with self._condition:
+            if not self._cancelled and not self._matured:
+                self._channel.unsubscribe(self._update)
+
+
+def channel_ready_future(channel):
+    """Creates a future.Future tracking when an implementations.Channel is ready.
+
+    Cancelling the returned future.Future does not tell the given
+    implementations.Channel to abandon attempts it may have been making to
+    connect; cancelling merely deactivates the return future.Future's
+    subscription to the given implementations.Channel's connectivity.
+
+    Args:
+      channel: An implementations.Channel.
+
+    Returns:
+      A future.Future that matures when the given Channel has connectivity
+        interfaces.ChannelConnectivity.READY.
+    """
+    ready_future = _ChannelReadyFuture(channel)
+    ready_future.start()
+    return ready_future

server/venv/lib/python3.9/site-packages/grpc/experimental/__init__.py

@@ -0,0 +1,192 @@
+# Copyright 2018 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""gRPC's experimental APIs.
+
+These APIs are subject to be removed during any minor version release.
+"""
+from __future__ import annotations
+
+import copy
+import functools
+import sys
+from typing import Callable, Optional, Union
+import warnings
+
+import grpc
+from grpc._cython import cygrpc as _cygrpc
+
+_EXPERIMENTAL_APIS_USED = set()
+
+
+class ChannelOptions(object):
+    """Indicates a channel option unique to gRPC Python.
+
+    This enumeration is part of an EXPERIMENTAL API.
+
+    Attributes:
+      SingleThreadedUnaryStream: Perform unary-stream RPCs on a single thread.
+    """
+
+    SingleThreadedUnaryStream = "SingleThreadedUnaryStream"
+
+
+class UsageError(Exception):
+    """Raised by the gRPC library to indicate usage not allowed by the API."""
+
+
+# It's important that there be a single insecure credentials object so that its
+# hash is deterministic and can be used for indexing in the simple stubs cache.
+_insecure_channel_credentials = grpc.ChannelCredentials(
+    _cygrpc.channel_credentials_insecure()
+)
+
+
+def insecure_channel_credentials():
+    """Creates a ChannelCredentials for use with an insecure channel.
+
+    THIS IS AN EXPERIMENTAL API.
+    """
+    return _insecure_channel_credentials
+
+
+class ExperimentalApiWarning(Warning):
+    """A warning that an API is experimental."""
+
+
+def _warn_experimental(api_name, stack_offset):
+    if api_name not in _EXPERIMENTAL_APIS_USED:
+        _EXPERIMENTAL_APIS_USED.add(api_name)
+        msg = (
+            "'{}' is an experimental API. It is subject to change or ".format(
+                api_name
+            )
+            + "removal between minor releases. Proceed with caution."
+        )
+        warnings.warn(msg, ExperimentalApiWarning, stacklevel=2 + stack_offset)
+
+
+def experimental_api(f):
+    @functools.wraps(f)
+    def _wrapper(*args, **kwargs):
+        _warn_experimental(f.__name__, 1)
+        return f(*args, **kwargs)
+
+    return _wrapper
+
+
+def wrap_server_method_handler(wrapper, handler):
+    """Wraps the server method handler function.
+
+    The server implementation requires all server handlers being wrapped as
+    RpcMethodHandler objects. This helper function ease the pain of writing
+    server handler wrappers.
+
+    Args:
+        wrapper: A wrapper function that takes in a method handler behavior
+          (the actual function) and returns a wrapped function.
+        handler: A RpcMethodHandler object to be wrapped.
+
+    Returns:
+        A newly created RpcMethodHandler.
+    """
+    if not handler:
+        return None
+
+    if not handler.request_streaming:
+        if not handler.response_streaming:
+            # NOTE(lidiz) _replace is a public API:
+            #   https://docs.python.org/dev/library/collections.html
+            return handler._replace(unary_unary=wrapper(handler.unary_unary))
+        return handler._replace(unary_stream=wrapper(handler.unary_stream))
+    if not handler.response_streaming:
+        return handler._replace(stream_unary=wrapper(handler.stream_unary))
+    return handler._replace(stream_stream=wrapper(handler.stream_stream))
+
+
+# A Callable to return in the async case
+# See the `ssl_channel_credentials_with_custom_signer` docstring for more detail on usage.
+PrivateKeySignCancel = Callable[[], None]
+PrivateKeySignatureAlgorithm = _cygrpc.PrivateKeySignatureAlgorithm
+PrivateKeySignOnComplete = Callable[[Union[bytes, Exception]], None]
+
+# See the `ssl_channel_credentials_with_custom_signer` docstring for more detail on usage.
+# The custom signing function for a user to implement and pass to gRPC Python.
+CustomPrivateKeySign = Callable[
+    [
+        bytes,
+        PrivateKeySignatureAlgorithm,
+        "PrivateKeySignOnComplete",
+    ],
+    Union[bytes, "PrivateKeySignCancel"],
+]
+
+
+@experimental_api
+def ssl_channel_credentials_with_custom_signer(
+    *,
+    private_key_sign_fn: "CustomPrivateKeySign",
+    root_certificates: Optional[bytes] = None,
+    certificate_chain: bytes,
+) -> grpc.ChannelCredentials:
+    """Creates a ChannelCredentials for use with an SSL-enabled Channel with a custom signer.
+
+    THIS IS AN EXPERIMENTAL API.
+    This API will be removed in a future version and combined with `grpc.ssl_channel_credentials`.
+
+    Args:
+      private_key_sign_fn: a function with the signature of
+        `CustomPrivateKeySign`. This function can return synchronously or
+        asynchronously.  To return synchronously, return the signed bytes.  To
+        return asynchronously, return a callable matching the
+        `PrivateKeySignCancel` signature.This can be a no-op if no cancellation is
+        needed. In the async case, this function must return this callable
+        quickly, then call the passed in `PrivateKeySignOnComplete` when the async
+        signing operation is complete to trigger gRPC to continue the handshake.
+      root_certificates: The PEM-encoded root certificates as a byte string,
+        or None to retrieve them from a default location chosen by gRPC
+        runtime.
+      certificate_chain: The PEM-encoded certificate chain as a byte string
+        to use
+
+    Returns:
+      A ChannelCredentials for use with an SSL-enabled Channel.
+    """
+    return grpc.ChannelCredentials(
+        _cygrpc.SSLChannelCredentials(
+            root_certificates, None, certificate_chain, private_key_sign_fn
+        )
+    )
+
+
+__all__ = (
+    "ChannelOptions",
+    "ExperimentalApiWarning",
+    "UsageError",
+    "insecure_channel_credentials",
+    "ssl_channel_credentials_with_custom_signer",
+    "wrap_server_method_handler",
+)
+
+if sys.version_info > (3, 6):
+    from grpc._simple_stubs import stream_stream
+    from grpc._simple_stubs import stream_unary
+    from grpc._simple_stubs import unary_stream
+    from grpc._simple_stubs import unary_unary
+
+    __all__ += (
+        "stream_stream",
+        "stream_unary",
+        "unary_stream",
+        "unary_unary",
+    )

server/venv/lib/python3.9/site-packages/grpc/experimental/aio/__init__.py

@@ -0,0 +1,16 @@
+# Copyright 2020 The gRPC Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Alias of grpc.aio to keep backward compatibility."""
+
+from grpc.aio import *

server/venv/lib/python3.9/site-packages/grpc/experimental/gevent.py

@@ -0,0 +1,27 @@
+# Copyright 2018 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""gRPC's Python gEvent APIs."""
+
+from grpc._cython import cygrpc as _cygrpc
+
+
+def init_gevent():
+    """Patches gRPC's libraries to be compatible with gevent.
+
+    This must be called AFTER the python standard lib has been patched,
+    but BEFORE creating and gRPC objects.
+
+    In order for progress to be made, the application must drive the event loop.
+    """
+    _cygrpc.init_grpc_gevent()

server/venv/lib/python3.9/site-packages/grpc/experimental/session_cache.py

@@ -0,0 +1,45 @@
+# Copyright 2018 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""gRPC's APIs for TLS Session Resumption support"""
+
+from grpc._cython import cygrpc as _cygrpc
+
+
+def ssl_session_cache_lru(capacity):
+    """Creates an SSLSessionCache with LRU replacement policy
+
+    Args:
+      capacity: Size of the cache
+
+    Returns:
+      An SSLSessionCache with LRU replacement policy that can be passed as a value for
+      the grpc.ssl_session_cache option to a grpc.Channel. SSL session caches are used
+      to store session tickets, which clients can present to resume previous TLS sessions
+      with a server.
+    """
+    return SSLSessionCache(_cygrpc.SSLSessionCacheLRU(capacity))
+
+
+class SSLSessionCache(object):
+    """An encapsulation of a session cache used for TLS session resumption.
+
+    Instances of this class can be passed to a Channel as values for the
+    grpc.ssl_session_cache option
+    """
+
+    def __init__(self, cache):
+        self._cache = cache
+
+    def __int__(self):
+        return int(self._cache)

server/venv/lib/python3.9/site-packages/grpc/framework/__init__.py

@@ -0,0 +1,13 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

server/venv/lib/python3.9/site-packages/grpc/framework/common/__init__.py

@@ -0,0 +1,13 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

server/venv/lib/python3.9/site-packages/grpc/framework/common/cardinality.py

@@ -0,0 +1,26 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Defines an enum for classifying RPC methods by streaming semantics."""
+
+import enum
+
+
+@enum.unique
+class Cardinality(enum.Enum):
+    """Describes the streaming semantics of an RPC method."""
+
+    UNARY_UNARY = "request-unary/response-unary"
+    UNARY_STREAM = "request-unary/response-streaming"
+    STREAM_UNARY = "request-streaming/response-unary"
+    STREAM_STREAM = "request-streaming/response-streaming"

server/venv/lib/python3.9/site-packages/grpc/framework/common/style.py

@@ -0,0 +1,24 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Defines an enum for classifying RPC methods by control flow semantics."""
+
+import enum
+
+
+@enum.unique
+class Service(enum.Enum):
+    """Describes the control flow style of RPC method implementation."""
+
+    INLINE = "inline"
+    EVENT = "event"

server/venv/lib/python3.9/site-packages/grpc/framework/foundation/__init__.py

@@ -0,0 +1,13 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

server/venv/lib/python3.9/site-packages/grpc/framework/foundation/abandonment.py

@@ -0,0 +1,22 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Utilities for indicating abandonment of computation."""
+
+
+class Abandoned(Exception):
+    """Indicates that some computation is being abandoned.
+
+    Abandoning a computation is different than returning a value or raising
+    an exception indicating some operational or programming defect.
+    """

server/venv/lib/python3.9/site-packages/grpc/framework/foundation/callable_util.py

@@ -0,0 +1,98 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Utilities for working with callables."""
+
+from abc import ABC
+import collections
+import enum
+import functools
+import logging
+
+_LOGGER = logging.getLogger(__name__)
+
+
+class Outcome(ABC):
+    """A sum type describing the outcome of some call.
+
+    Attributes:
+      kind: One of Kind.RETURNED or Kind.RAISED respectively indicating that the
+        call returned a value or raised an exception.
+      return_value: The value returned by the call. Must be present if kind is
+        Kind.RETURNED.
+      exception: The exception raised by the call. Must be present if kind is
+        Kind.RAISED.
+    """
+
+    @enum.unique
+    class Kind(enum.Enum):
+        """Identifies the general kind of the outcome of some call."""
+
+        RETURNED = enum.auto()
+        RAISED = enum.auto()
+
+
+class _EasyOutcome(
+    collections.namedtuple(
+        "_EasyOutcome", ["kind", "return_value", "exception"]
+    ),
+    Outcome,
+):
+    """A trivial implementation of Outcome."""
+
+
+def _call_logging_exceptions(behavior, message, *args, **kwargs):
+    try:
+        return _EasyOutcome(
+            Outcome.Kind.RETURNED, behavior(*args, **kwargs), None
+        )
+    except Exception as e:  # pylint: disable=broad-except
+        _LOGGER.exception(message)
+        return _EasyOutcome(Outcome.Kind.RAISED, None, e)
+
+
+def with_exceptions_logged(behavior, message):
+    """Wraps a callable in a try-except that logs any exceptions it raises.
+
+    Args:
+      behavior: Any callable.
+      message: A string to log if the behavior raises an exception.
+
+    Returns:
+      A callable that when executed invokes the given behavior. The returned
+        callable takes the same arguments as the given behavior but returns a
+        future.Outcome describing whether the given behavior returned a value or
+        raised an exception.
+    """
+
+    @functools.wraps(behavior)
+    def wrapped_behavior(*args, **kwargs):
+        return _call_logging_exceptions(behavior, message, *args, **kwargs)
+
+    return wrapped_behavior
+
+
+def call_logging_exceptions(behavior, message, *args, **kwargs):
+    """Calls a behavior in a try-except that logs any exceptions it raises.
+
+    Args:
+      behavior: Any callable.
+      message: A string to log if the behavior raises an exception.
+      *args: Positional arguments to pass to the given behavior.
+      **kwargs: Keyword arguments to pass to the given behavior.
+
+    Returns:
+      An Outcome describing whether the given behavior returned a value or raised
+        an exception.
+    """
+    return _call_logging_exceptions(behavior, message, *args, **kwargs)

server/venv/lib/python3.9/site-packages/grpc/framework/foundation/future.py

@@ -0,0 +1,219 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""A Future interface.
+
+Python doesn't have a Future interface in its standard library. In the absence
+of such a standard, three separate, incompatible implementations
+(concurrent.futures.Future, ndb.Future, and asyncio.Future) have appeared. This
+interface attempts to be as compatible as possible with
+concurrent.futures.Future. From ndb.Future it adopts a traceback-object accessor
+method.
+
+Unlike the concrete and implemented Future classes listed above, the Future
+class defined in this module is an entirely abstract interface that anyone may
+implement and use.
+
+The one known incompatibility between this interface and the interface of
+concurrent.futures.Future is that this interface defines its own CancelledError
+and TimeoutError exceptions rather than raising the implementation-private
+concurrent.futures._base.CancelledError and the
+built-in-but-only-in-3.3-and-later TimeoutError.
+"""
+
+import abc
+
+
+class TimeoutError(Exception):
+    """Indicates that a particular call timed out."""
+
+
+class CancelledError(Exception):
+    """Indicates that the computation underlying a Future was cancelled."""
+
+
+class Future(abc.ABC):
+    """A representation of a computation in another control flow.
+
+    Computations represented by a Future may be yet to be begun, may be ongoing,
+    or may have already completed.
+    """
+
+    # NOTE(nathaniel): This isn't the return type that I would want to have if it
+    # were up to me. Were this interface being written from scratch, the return
+    # type of this method would probably be a sum type like:
+    #
+    # NOT_COMMENCED
+    # COMMENCED_AND_NOT_COMPLETED
+    # PARTIAL_RESULT<Partial_Result_Type>
+    # COMPLETED<Result_Type>
+    # UNCANCELLABLE
+    # NOT_IMMEDIATELY_DETERMINABLE
+    @abc.abstractmethod
+    def cancel(self):
+        """Attempts to cancel the computation.
+
+        This method does not block.
+
+        Returns:
+          True if the computation has not yet begun, will not be allowed to take
+            place, and determination of both was possible without blocking. False
+            under all other circumstances including but not limited to the
+            computation's already having begun, the computation's already having
+            finished, and the computation's having been scheduled for execution on a
+            remote system for which a determination of whether or not it commenced
+            before being cancelled cannot be made without blocking.
+        """
+        raise NotImplementedError()
+
+    # NOTE(nathaniel): Here too this isn't the return type that I'd want this
+    # method to have if it were up to me. I think I'd go with another sum type
+    # like:
+    #
+    # NOT_CANCELLED (this object's cancel method hasn't been called)
+    # NOT_COMMENCED
+    # COMMENCED_AND_NOT_COMPLETED
+    # PARTIAL_RESULT<Partial_Result_Type>
+    # COMPLETED<Result_Type>
+    # UNCANCELLABLE
+    # NOT_IMMEDIATELY_DETERMINABLE
+    #
+    # Notice how giving the cancel method the right semantics obviates most
+    # reasons for this method to exist.
+    @abc.abstractmethod
+    def cancelled(self):
+        """Describes whether the computation was cancelled.
+
+        This method does not block.
+
+        Returns:
+          True if the computation was cancelled any time before its result became
+            immediately available. False under all other circumstances including but
+            not limited to this object's cancel method not having been called and
+            the computation's result having become immediately available.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def running(self):
+        """Describes whether the computation is taking place.
+
+        This method does not block.
+
+        Returns:
+          True if the computation is scheduled to take place in the future or is
+            taking place now, or False if the computation took place in the past or
+            was cancelled.
+        """
+        raise NotImplementedError()
+
+    # NOTE(nathaniel): These aren't quite the semantics I'd like here either. I
+    # would rather this only returned True in cases in which the underlying
+    # computation completed successfully. A computation's having been cancelled
+    # conflicts with considering that computation "done".
+    @abc.abstractmethod
+    def done(self):
+        """Describes whether the computation has taken place.
+
+        This method does not block.
+
+        Returns:
+          True if the computation is known to have either completed or have been
+            unscheduled or interrupted. False if the computation may possibly be
+            executing or scheduled to execute later.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def result(self, timeout=None):
+        """Accesses the outcome of the computation or raises its exception.
+
+        This method may return immediately or may block.
+
+        Args:
+          timeout: The length of time in seconds to wait for the computation to
+            finish or be cancelled, or None if this method should block until the
+            computation has finished or is cancelled no matter how long that takes.
+
+        Returns:
+          The return value of the computation.
+
+        Raises:
+          TimeoutError: If a timeout value is passed and the computation does not
+            terminate within the allotted time.
+          CancelledError: If the computation was cancelled.
+          Exception: If the computation raised an exception, this call will raise
+            the same exception.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def exception(self, timeout=None):
+        """Return the exception raised by the computation.
+
+        This method may return immediately or may block.
+
+        Args:
+          timeout: The length of time in seconds to wait for the computation to
+            terminate or be cancelled, or None if this method should block until
+            the computation is terminated or is cancelled no matter how long that
+            takes.
+
+        Returns:
+          The exception raised by the computation, or None if the computation did
+            not raise an exception.
+
+        Raises:
+          TimeoutError: If a timeout value is passed and the computation does not
+            terminate within the allotted time.
+          CancelledError: If the computation was cancelled.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def traceback(self, timeout=None):
+        """Access the traceback of the exception raised by the computation.
+
+        This method may return immediately or may block.
+
+        Args:
+          timeout: The length of time in seconds to wait for the computation to
+            terminate or be cancelled, or None if this method should block until
+            the computation is terminated or is cancelled no matter how long that
+            takes.
+
+        Returns:
+          The traceback of the exception raised by the computation, or None if the
+            computation did not raise an exception.
+
+        Raises:
+          TimeoutError: If a timeout value is passed and the computation does not
+            terminate within the allotted time.
+          CancelledError: If the computation was cancelled.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def add_done_callback(self, fn):
+        """Adds a function to be called at completion of the computation.
+
+        The callback will be passed this Future object describing the outcome of
+        the computation.
+
+        If the computation has already completed, the callback will be called
+        immediately.
+
+        Args:
+          fn: A callable taking this Future object as its single parameter.
+        """
+        raise NotImplementedError()

server/venv/lib/python3.9/site-packages/grpc/framework/foundation/logging_pool.py

@@ -0,0 +1,72 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""A thread pool that logs exceptions raised by tasks executed within it."""
+
+from concurrent import futures
+import logging
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def _wrap(behavior):
+    """Wraps an arbitrary callable behavior in exception-logging."""
+
+    def _wrapping(*args, **kwargs):
+        try:
+            return behavior(*args, **kwargs)
+        except Exception:
+            _LOGGER.exception(
+                "Unexpected exception from %s executed in logging pool!",
+                behavior,
+            )
+            raise
+
+    return _wrapping
+
+
+class _LoggingPool(object):
+    """An exception-logging futures.ThreadPoolExecutor-compatible thread pool."""
+
+    def __init__(self, backing_pool):
+        self._backing_pool = backing_pool
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self._backing_pool.shutdown(wait=True)
+
+    def submit(self, fn, *args, **kwargs):
+        return self._backing_pool.submit(_wrap(fn), *args, **kwargs)
+
+    def map(self, func, *iterables, **kwargs):
+        return self._backing_pool.map(
+            _wrap(func), *iterables, timeout=kwargs.get("timeout")
+        )
+
+    def shutdown(self, wait=True):
+        self._backing_pool.shutdown(wait=wait)
+
+
+def pool(max_workers):
+    """Creates a thread pool that logs exceptions raised by the tasks within it.
+
+    Args:
+      max_workers: The maximum number of worker threads to allow the pool.
+
+    Returns:
+      A futures.ThreadPoolExecutor-compatible thread pool that logs exceptions
+        raised by the tasks executed within it.
+    """
+    return _LoggingPool(futures.ThreadPoolExecutor(max_workers))

server/venv/lib/python3.9/site-packages/grpc/framework/foundation/stream.py

@@ -0,0 +1,43 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Interfaces related to streams of values or objects."""
+
+import abc
+
+
+class Consumer(abc.ABC):
+    """Interface for consumers of finite streams of values or objects."""
+
+    @abc.abstractmethod
+    def consume(self, value):
+        """Accepts a value.
+
+        Args:
+          value: Any value accepted by this Consumer.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def terminate(self):
+        """Indicates to this Consumer that no more values will be supplied."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def consume_and_terminate(self, value):
+        """Supplies a value and signals that no more values will be supplied.
+
+        Args:
+          value: Any value accepted by this Consumer.
+        """
+        raise NotImplementedError()

server/venv/lib/python3.9/site-packages/grpc/framework/foundation/stream_util.py

@@ -0,0 +1,147 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Helpful utilities related to the stream module."""
+
+import logging
+import threading
+
+from grpc.framework.foundation import stream
+
+_NO_VALUE = object()
+_LOGGER = logging.getLogger(__name__)
+
+
+class TransformingConsumer(stream.Consumer):
+    """A stream.Consumer that passes a transformation of its input to another."""
+
+    def __init__(self, transformation, downstream):
+        self._transformation = transformation
+        self._downstream = downstream
+
+    def consume(self, value):
+        self._downstream.consume(self._transformation(value))
+
+    def terminate(self):
+        self._downstream.terminate()
+
+    def consume_and_terminate(self, value):
+        self._downstream.consume_and_terminate(self._transformation(value))
+
+
+class IterableConsumer(stream.Consumer):
+    """A Consumer that when iterated over emits the values it has consumed."""
+
+    def __init__(self):
+        self._condition = threading.Condition()
+        self._values = []
+        self._active = True
+
+    def consume(self, value):
+        with self._condition:
+            if self._active:
+                self._values.append(value)
+                self._condition.notify()
+
+    def terminate(self):
+        with self._condition:
+            self._active = False
+            self._condition.notify()
+
+    def consume_and_terminate(self, value):
+        with self._condition:
+            if self._active:
+                self._values.append(value)
+                self._active = False
+                self._condition.notify()
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        return self.next()
+
+    def next(self):
+        with self._condition:
+            while self._active and not self._values:
+                self._condition.wait()
+            if self._values:
+                return self._values.pop(0)
+            raise StopIteration()
+
+
+class ThreadSwitchingConsumer(stream.Consumer):
+    """A Consumer decorator that affords serialization and asynchrony."""
+
+    def __init__(self, sink, pool):
+        self._lock = threading.Lock()
+        self._sink = sink
+        self._pool = pool
+        # True if self._spin has been submitted to the pool to be called once and
+        # that call has not yet returned, False otherwise.
+        self._spinning = False
+        self._values = []
+        self._active = True
+
+    def _spin(self, sink, value, terminate):
+        while True:
+            try:
+                if value is _NO_VALUE:
+                    sink.terminate()
+                elif terminate:
+                    sink.consume_and_terminate(value)
+                else:
+                    sink.consume(value)
+            except Exception as e:  # pylint:disable=broad-except
+                _LOGGER.exception(e)
+
+            with self._lock:
+                if terminate:
+                    self._spinning = False
+                    return
+                if self._values:
+                    value = self._values.pop(0)
+                    terminate = not self._values and not self._active
+                elif not self._active:
+                    value = _NO_VALUE
+                    terminate = True
+                else:
+                    self._spinning = False
+                    return
+
+    def consume(self, value):
+        with self._lock:
+            if self._active:
+                if self._spinning:
+                    self._values.append(value)
+                else:
+                    self._pool.submit(self._spin, self._sink, value, False)
+                    self._spinning = True
+
+    def terminate(self):
+        with self._lock:
+            if self._active:
+                self._active = False
+                if not self._spinning:
+                    self._pool.submit(self._spin, self._sink, _NO_VALUE, True)
+                    self._spinning = True
+
+    def consume_and_terminate(self, value):
+        with self._lock:
+            if self._active:
+                self._active = False
+                if self._spinning:
+                    self._values.append(value)
+                else:
+                    self._pool.submit(self._spin, self._sink, value, True)
+                    self._spinning = True

server/venv/lib/python3.9/site-packages/grpc/framework/interfaces/__init__.py

@@ -0,0 +1,13 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

server/venv/lib/python3.9/site-packages/grpc/framework/interfaces/base/__init__.py

@@ -0,0 +1,13 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

server/venv/lib/python3.9/site-packages/grpc/framework/interfaces/base/base.py

@@ -0,0 +1,328 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""The base interface of RPC Framework.
+
+Implementations of this interface support the conduct of "operations":
+exchanges between two distinct ends of an arbitrary number of data payloads
+and metadata such as a name for the operation, initial and terminal metadata
+in each direction, and flow control. These operations may be used for transfers
+of data, remote procedure calls, status indication, or anything else
+applications choose.
+"""
+
+# threading is referenced from specification in this module.
+import abc
+import enum
+import threading  # pylint: disable=unused-import
+
+# pylint: disable=too-many-arguments
+
+
+class NoSuchMethodError(Exception):
+    """Indicates that an unrecognized operation has been called.
+
+    Attributes:
+      code: A code value to communicate to the other side of the operation
+        along with indication of operation termination. May be None.
+      details: A details value to communicate to the other side of the
+        operation along with indication of operation termination. May be None.
+    """
+
+    def __init__(self, code, details):
+        """Constructor.
+
+        Args:
+          code: A code value to communicate to the other side of the operation
+            along with indication of operation termination. May be None.
+          details: A details value to communicate to the other side of the
+            operation along with indication of operation termination. May be None.
+        """
+        super(NoSuchMethodError, self).__init__()
+        self.code = code
+        self.details = details
+
+
+class Outcome(object):
+    """The outcome of an operation.
+
+    Attributes:
+      kind: A Kind value coarsely identifying how the operation terminated.
+      code: An application-specific code value or None if no such value was
+        provided.
+      details: An application-specific details value or None if no such value was
+        provided.
+    """
+
+    @enum.unique
+    class Kind(enum.Enum):
+        """Ways in which an operation can terminate."""
+
+        COMPLETED = "completed"
+        CANCELLED = "cancelled"
+        EXPIRED = "expired"
+        LOCAL_SHUTDOWN = "local shutdown"
+        REMOTE_SHUTDOWN = "remote shutdown"
+        RECEPTION_FAILURE = "reception failure"
+        TRANSMISSION_FAILURE = "transmission failure"
+        LOCAL_FAILURE = "local failure"
+        REMOTE_FAILURE = "remote failure"
+
+
+class Completion(abc.ABC):
+    """An aggregate of the values exchanged upon operation completion.
+
+    Attributes:
+      terminal_metadata: A terminal metadata value for the operation.
+      code: A code value for the operation.
+      message: A message value for the operation.
+    """
+
+
+class OperationContext(abc.ABC):
+    """Provides operation-related information and action."""
+
+    @abc.abstractmethod
+    def outcome(self):
+        """Indicates the operation's outcome (or that the operation is ongoing).
+
+        Returns:
+          None if the operation is still active or the Outcome value for the
+            operation if it has terminated.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def add_termination_callback(self, callback):
+        """Adds a function to be called upon operation termination.
+
+        Args:
+          callback: A callable to be passed an Outcome value on operation
+            termination.
+
+        Returns:
+          None if the operation has not yet terminated and the passed callback will
+            later be called when it does terminate, or if the operation has already
+            terminated an Outcome value describing the operation termination and the
+            passed callback will not be called as a result of this method call.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def time_remaining(self):
+        """Describes the length of allowed time remaining for the operation.
+
+        Returns:
+          A nonnegative float indicating the length of allowed time in seconds
+          remaining for the operation to complete before it is considered to have
+          timed out. Zero is returned if the operation has terminated.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def cancel(self):
+        """Cancels the operation if the operation has not yet terminated."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def fail(self, exception):
+        """Indicates that the operation has failed.
+
+        Args:
+          exception: An exception germane to the operation failure. May be None.
+        """
+        raise NotImplementedError()
+
+
+class Operator(abc.ABC):
+    """An interface through which to participate in an operation."""
+
+    @abc.abstractmethod
+    def advance(
+        self,
+        initial_metadata=None,
+        payload=None,
+        completion=None,
+        allowance=None,
+    ):
+        """Progresses the operation.
+
+        Args:
+          initial_metadata: An initial metadata value. Only one may ever be
+            communicated in each direction for an operation, and they must be
+            communicated no later than either the first payload or the completion.
+          payload: A payload value.
+          completion: A Completion value. May only ever be non-None once in either
+            direction, and no payloads may be passed after it has been communicated.
+          allowance: A positive integer communicating the number of additional
+            payloads allowed to be passed by the remote side of the operation.
+        """
+        raise NotImplementedError()
+
+
+class ProtocolReceiver(abc.ABC):
+    """A means of receiving protocol values during an operation."""
+
+    @abc.abstractmethod
+    def context(self, protocol_context):
+        """Accepts the protocol context object for the operation.
+
+        Args:
+          protocol_context: The protocol context object for the operation.
+        """
+        raise NotImplementedError()
+
+
+class Subscription(abc.ABC):
+    """Describes customer code's interest in values from the other side.
+
+    Attributes:
+      kind: A Kind value describing the overall kind of this value.
+      termination_callback: A callable to be passed the Outcome associated with
+        the operation after it has terminated. Must be non-None if kind is
+        Kind.TERMINATION_ONLY. Must be None otherwise.
+      allowance: A callable behavior that accepts positive integers representing
+        the number of additional payloads allowed to be passed to the other side
+        of the operation. Must be None if kind is Kind.FULL. Must not be None
+        otherwise.
+      operator: An Operator to be passed values from the other side of the
+        operation. Must be non-None if kind is Kind.FULL. Must be None otherwise.
+      protocol_receiver: A ProtocolReceiver to be passed protocol objects as they
+        become available during the operation. Must be non-None if kind is
+        Kind.FULL.
+    """
+
+    @enum.unique
+    class Kind(enum.Enum):
+        NONE = "none"
+        TERMINATION_ONLY = "termination only"
+        FULL = "full"
+
+
+class Servicer(abc.ABC):
+    """Interface for service implementations."""
+
+    @abc.abstractmethod
+    def service(self, group, method, context, output_operator):
+        """Services an operation.
+
+        Args:
+          group: The group identifier of the operation to be serviced.
+          method: The method identifier of the operation to be serviced.
+          context: An OperationContext object affording contextual information and
+            actions.
+          output_operator: An Operator that will accept output values of the
+            operation.
+
+        Returns:
+          A Subscription via which this object may or may not accept more values of
+            the operation.
+
+        Raises:
+          NoSuchMethodError: If this Servicer does not handle operations with the
+            given group and method.
+          abandonment.Abandoned: If the operation has been aborted and there no
+            longer is any reason to service the operation.
+        """
+        raise NotImplementedError()
+
+
+class End(abc.ABC):
+    """Common type for entry-point objects on both sides of an operation."""
+
+    @abc.abstractmethod
+    def start(self):
+        """Starts this object's service of operations."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def stop(self, grace):
+        """Stops this object's service of operations.
+
+        This object will refuse service of new operations as soon as this method is
+        called but operations under way at the time of the call may be given a
+        grace period during which they are allowed to finish.
+
+        Args:
+          grace: A duration of time in seconds to allow ongoing operations to
+            terminate before being forcefully terminated by the stopping of this
+            End. May be zero to terminate all ongoing operations and immediately
+            stop.
+
+        Returns:
+          A threading.Event that will be set to indicate all operations having
+            terminated and this End having completely stopped. The returned event
+            may not be set until after the full grace period (if some ongoing
+            operation continues for the full length of the period) or it may be set
+            much sooner (if for example this End had no operations in progress at
+            the time its stop method was called).
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def operate(
+        self,
+        group,
+        method,
+        subscription,
+        timeout,
+        initial_metadata=None,
+        payload=None,
+        completion=None,
+        protocol_options=None,
+    ):
+        """Commences an operation.
+
+        Args:
+          group: The group identifier of the invoked operation.
+          method: The method identifier of the invoked operation.
+          subscription: A Subscription to which the results of the operation will be
+            passed.
+          timeout: A length of time in seconds to allow for the operation.
+          initial_metadata: An initial metadata value to be sent to the other side
+            of the operation. May be None if the initial metadata will be later
+            passed via the returned operator or if there will be no initial metadata
+            passed at all.
+          payload: An initial payload for the operation.
+          completion: A Completion value indicating the end of transmission to the
+            other side of the operation.
+          protocol_options: A value specified by the provider of a Base interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          A pair of objects affording information about the operation and action
+            continuing the operation. The first element of the returned pair is an
+            OperationContext for the operation and the second element of the
+            returned pair is an Operator to which operation values not passed in
+            this call should later be passed.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def operation_stats(self):
+        """Reports the number of terminated operations broken down by outcome.
+
+        Returns:
+          A dictionary from Outcome.Kind value to an integer identifying the number
+            of operations that terminated with that outcome kind.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def add_idle_action(self, action):
+        """Adds an action to be called when this End has no ongoing operations.
+
+        Args:
+          action: A callable that accepts no arguments.
+        """
+        raise NotImplementedError()

server/venv/lib/python3.9/site-packages/grpc/framework/interfaces/base/utilities.py

@@ -0,0 +1,83 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Utilities for use with the base interface of RPC Framework."""
+
+import collections
+
+from grpc.framework.interfaces.base import base
+
+
+class _Completion(
+    base.Completion,
+    collections.namedtuple(
+        "_Completion",
+        (
+            "terminal_metadata",
+            "code",
+            "message",
+        ),
+    ),
+):
+    """A trivial implementation of base.Completion."""
+
+
+class _Subscription(
+    base.Subscription,
+    collections.namedtuple(
+        "_Subscription",
+        (
+            "kind",
+            "termination_callback",
+            "allowance",
+            "operator",
+            "protocol_receiver",
+        ),
+    ),
+):
+    """A trivial implementation of base.Subscription."""
+
+
+_NONE_SUBSCRIPTION = _Subscription(
+    base.Subscription.Kind.NONE, None, None, None, None
+)
+
+
+def completion(terminal_metadata, code, message):
+    """Creates a base.Completion aggregating the given operation values.
+
+    Args:
+      terminal_metadata: A terminal metadata value for an operation.
+      code: A code value for an operation.
+      message: A message value for an operation.
+
+    Returns:
+      A base.Completion aggregating the given operation values.
+    """
+    return _Completion(terminal_metadata, code, message)
+
+
+def full_subscription(operator, protocol_receiver):
+    """Creates a "full" base.Subscription for the given base.Operator.
+
+    Args:
+      operator: A base.Operator to be used in an operation.
+      protocol_receiver: A base.ProtocolReceiver to be used in an operation.
+
+    Returns:
+      A base.Subscription of kind base.Subscription.Kind.FULL wrapping the given
+        base.Operator and base.ProtocolReceiver.
+    """
+    return _Subscription(
+        base.Subscription.Kind.FULL, None, None, operator, protocol_receiver
+    )

server/venv/lib/python3.9/site-packages/grpc/framework/interfaces/face/__init__.py

@@ -0,0 +1,13 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

server/venv/lib/python3.9/site-packages/grpc/framework/interfaces/face/utilities.py

@@ -0,0 +1,245 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Utilities for RPC Framework's Face interface."""
+
+import collections
+
+# stream is referenced from specification in this module.
+from grpc.framework.common import cardinality
+from grpc.framework.common import style
+from grpc.framework.foundation import stream  # pylint: disable=unused-import
+from grpc.framework.interfaces.face import face
+
+
+class _MethodImplementation(
+    face.MethodImplementation,
+    collections.namedtuple(
+        "_MethodImplementation",
+        [
+            "cardinality",
+            "style",
+            "unary_unary_inline",
+            "unary_stream_inline",
+            "stream_unary_inline",
+            "stream_stream_inline",
+            "unary_unary_event",
+            "unary_stream_event",
+            "stream_unary_event",
+            "stream_stream_event",
+        ],
+    ),
+):
+    pass
+
+
+def unary_unary_inline(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a unary-unary RPC method as a callable value
+        that takes a request value and an face.ServicerContext object and
+        returns a response value.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.UNARY_UNARY,
+        style.Service.INLINE,
+        behavior,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+    )
+
+
+def unary_stream_inline(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a unary-stream RPC method as a callable
+        value that takes a request value and an face.ServicerContext object and
+        returns an iterator of response values.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.UNARY_STREAM,
+        style.Service.INLINE,
+        None,
+        behavior,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+    )
+
+
+def stream_unary_inline(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a stream-unary RPC method as a callable
+        value that takes an iterator of request values and an
+        face.ServicerContext object and returns a response value.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.STREAM_UNARY,
+        style.Service.INLINE,
+        None,
+        None,
+        behavior,
+        None,
+        None,
+        None,
+        None,
+        None,
+    )
+
+
+def stream_stream_inline(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a stream-stream RPC method as a callable
+        value that takes an iterator of request values and an
+        face.ServicerContext object and returns an iterator of response values.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.STREAM_STREAM,
+        style.Service.INLINE,
+        None,
+        None,
+        None,
+        behavior,
+        None,
+        None,
+        None,
+        None,
+    )
+
+
+def unary_unary_event(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a unary-unary RPC method as a callable
+        value that takes a request value, a response callback to which to pass
+        the response value of the RPC, and an face.ServicerContext.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.UNARY_UNARY,
+        style.Service.EVENT,
+        None,
+        None,
+        None,
+        None,
+        behavior,
+        None,
+        None,
+        None,
+    )
+
+
+def unary_stream_event(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a unary-stream RPC method as a callable
+        value that takes a request value, a stream.Consumer to which to pass the
+        response values of the RPC, and an face.ServicerContext.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.UNARY_STREAM,
+        style.Service.EVENT,
+        None,
+        None,
+        None,
+        None,
+        None,
+        behavior,
+        None,
+        None,
+    )
+
+
+def stream_unary_event(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a stream-unary RPC method as a callable
+        value that takes a response callback to which to pass the response value
+        of the RPC and an face.ServicerContext and returns a stream.Consumer to
+        which the request values of the RPC should be passed.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.STREAM_UNARY,
+        style.Service.EVENT,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+        behavior,
+        None,
+    )
+
+
+def stream_stream_event(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a stream-stream RPC method as a callable
+        value that takes a stream.Consumer to which to pass the response values
+        of the RPC and an face.ServicerContext and returns a stream.Consumer to
+        which the request values of the RPC should be passed.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.STREAM_STREAM,
+        style.Service.EVENT,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+        behavior,
+    )