initiall commit

apps/backend/internal/services/health_service.go

@@ -0,0 +1,100 @@
+package services
+
+import (
+	"context"
+	"database/sql"
+	"time"
+)
+
+// HealthService provides health check functionality
+type HealthService struct {
+	db *sql.DB
+}
+
+// NewHealthService creates a new health service
+func NewHealthService(db *sql.DB) *HealthService {
+	return &HealthService{
+		db: db,
+	}
+}
+
+// HealthStatus represents the health status of the application
+type HealthStatus struct {
+	Status    string                 `json:"status"`
+	Timestamp time.Time              `json:"timestamp"`
+	Version   string                 `json:"version"`
+	Checks    map[string]CheckResult `json:"checks"`
+}
+
+// CheckResult represents the result of a health check
+type CheckResult struct {
+	Status  string        `json:"status"`
+	Message string        `json:"message,omitempty"`
+	Latency time.Duration `json:"latency_ms"`
+}
+
+// Check performs all health checks
+func (hs *HealthService) Check(ctx context.Context, version string) HealthStatus {
+	status := HealthStatus{
+		Status:    "healthy",
+		Timestamp: time.Now(),
+		Version:   version,
+		Checks:    make(map[string]CheckResult),
+	}
+
+	// Database check
+	dbCheck := hs.checkDatabase(ctx)
+	status.Checks["database"] = dbCheck
+	if dbCheck.Status != "healthy" {
+		status.Status = "unhealthy"
+	}
+
+	// Add more checks as needed
+	status.Checks["api"] = CheckResult{
+		Status:  "healthy",
+		Message: "API is responding",
+		Latency: 0,
+	}
+
+	return status
+}
+
+// checkDatabase checks database connectivity
+func (hs *HealthService) checkDatabase(ctx context.Context) CheckResult {
+	start := time.Now()
+	
+	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+
+	err := hs.db.PingContext(ctx)
+	latency := time.Since(start)
+
+	if err != nil {
+		return CheckResult{
+			Status:  "unhealthy",
+			Message: err.Error(),
+			Latency: latency,
+		}
+	}
+
+	return CheckResult{
+		Status:  "healthy",
+		Message: "Database connection successful",
+		Latency: latency,
+	}
+}
+
+// Readiness checks if the service is ready to accept traffic
+func (hs *HealthService) Readiness(ctx context.Context) bool {
+	ctx, cancel := context.WithTimeout(ctx, 2*time.Second)
+	defer cancel()
+
+	err := hs.db.PingContext(ctx)
+	return err == nil
+}
+
+// Liveness checks if the service is alive
+func (hs *HealthService) Liveness(ctx context.Context) bool {
+	// Simple check - if we can execute this, we're alive
+	return true
+}