Implement health check for deploy. Make version endpoint to return revision if not set

internal/api/health/health_handler.go

@@ -0,0 +1,46 @@
+package health
+
+import (
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"net/http"
+
+	"payouts/internal/service/database"
+)
+
+// Route health route
+const Route = "/health"
+
+// New constructs a new health Handler.
+func New(dbService database.Service) (Handler, error) {
+	return &handler{
+		dbService: dbService,
+	}, nil
+}
+
+type handler struct {
+	dbService database.Service
+}
+
+// HealthHandler handles the health check requests
+func (h *handler) Health(w http.ResponseWriter, r *http.Request) {
+	defer r.Body.Close()
+	w.Header().Set("Content-Type", "application/json")
+
+	status := map[string]any{}
+
+	// Check database connection
+	err := h.dbService.HealthCheck()
+	if err != nil {
+		w.WriteHeader(http.StatusServiceUnavailable)
+		status["Error"] = fmt.Sprintf("%v", err)
+		slog.Error("Health check failed", slog.String("error", status["Error"].(string)))
+	} else {
+		w.WriteHeader(http.StatusOK)
+	}
+	status["OK"] = (err == nil)
+
+	encoder := json.NewEncoder(w)
+	encoder.Encode(status)
+}