init: initial commit

services/api/internal/operations/service/health.go

@@ -0,0 +1,49 @@
+package service
+
+import (
+	"context"
+	"sync"
+	"time"
+)
+
+type Probe func(context.Context) error
+
+type Component struct {
+	Status string `json:"status"`
+}
+type Health struct {
+	Status     string               `json:"status"`
+	CheckedAt  time.Time            `json:"checked_at"`
+	Components map[string]Component `json:"components"`
+}
+type HealthService struct{ postgres, redis Probe }
+
+func NewHealthService(postgres, redis Probe) *HealthService {
+	return &HealthService{postgres: postgres, redis: redis}
+}
+
+func (s *HealthService) Check(ctx context.Context) Health {
+	ctx, cancel := context.WithTimeout(ctx, 2*time.Second)
+	defer cancel()
+	result := Health{Status: "ready", CheckedAt: time.Now().UTC(), Components: map[string]Component{}}
+	var mu sync.Mutex
+	var wg sync.WaitGroup
+	for name, probe := range map[string]Probe{"postgresql": s.postgres, "redis": s.redis} {
+		wg.Go(func() {
+			status := "unavailable"
+			if probe == nil {
+				status = "not_configured"
+			} else if probe(ctx) == nil {
+				status = "ready"
+			}
+			mu.Lock()
+			defer mu.Unlock()
+			result.Components[name] = Component{Status: status}
+			if status != "ready" {
+				result.Status = "not_ready"
+			}
+		})
+	}
+	wg.Wait()
+	return result
+}