fix: recover transient stock history failures within bounded deadlines

internal/service/market.go

@@ -90,6 +90,9 @@ func (s *MarketService) History(ctx context.Context, u model.User, symbol, excha
 		return model.MarketHistory{}, e
 	}
 	result, e := s.adapter.History(ctx, c, symbol, exchange, start, end)
+	if e != nil && ctx.Err() == nil {
+		result, e = s.adapter.History(ctx, c, symbol, exchange, start, end)
+	}
 	if e != nil {
 		return result, apperror.ErrUnavailable
 	}

internal/service/market_test.go

@@ -0,0 +1,62 @@
+package service
+
+import (
+	"context"
+	"errors"
+	"git.sundynix.cn/Blizzard/Veyra/internal/apperror"
+	"git.sundynix.cn/Blizzard/Veyra/internal/model"
+	"testing"
+)
+
+type historyProvider struct{ ProviderRepository }
+
+func (historyProvider) Get(context.Context, string) (model.ProviderConfig, error) {
+	return model.ProviderConfig{Enabled: true, MarketAdapter: "sina_public"}, nil
+}
+
+type historyRepo struct{ MarketRepository }
+type retryHistory struct {
+	MarketAdapter
+	calls      int
+	cancel     context.CancelFunc
+	alwaysFail bool
+}
+
+func (a *retryHistory) History(ctx context.Context, _ model.ProviderConfig, symbol, exchange, start, end string) (model.MarketHistory, error) {
+	a.calls++
+	if a.cancel != nil {
+		a.cancel()
+	}
+	if a.calls == 1 || a.alwaysFail {
+		return model.MarketHistory{}, errors.New("upstream failure")
+	}
+	return model.MarketHistory{Symbol: symbol, Exchange: exchange, Bars: []model.HistoricalBar{{Date: start, Close: "9.41"}}}, nil
+}
+func TestHistoryRetriesOnceAndHonorsCancellation(t *testing.T) {
+	for _, tc := range []struct {
+		name         string
+		cancel, fail bool
+		calls        int
+	}{{"recovers", false, false, 2}, {"bounded failure", false, true, 2}, {"cancelled", true, false, 1}} {
+		t.Run(tc.name, func(t *testing.T) {
+			ctx, cancel := context.WithCancel(context.Background())
+			defer cancel()
+			adapter := &retryHistory{alwaysFail: tc.fail}
+			if tc.cancel {
+				adapter.cancel = cancel
+			}
+			s := NewMarketService(historyRepo{}, historyProvider{}, adapter, true)
+			result, err := s.History(ctx, model.User{Role: "ADMIN", Status: "ACTIVE"}, "002215", "SZSE", "2026-07-01", "2026-07-02")
+			if adapter.calls != tc.calls {
+				t.Fatalf("calls: %d", adapter.calls)
+			}
+			if tc.fail || tc.cancel {
+				if !errors.Is(err, apperror.ErrUnavailable) {
+					t.Fatal(err)
+				}
+			} else if err != nil || result.Symbol != "002215" || len(result.Bars) != 1 {
+				t.Fatal("retry did not preserve real result", err)
+			}
+		})
+	}
+}