food-ai/backend/internal/infra/middleware/logging.go

package middleware

import (
	"log/slog"
	"net/http"
	"time"
)

type responseWriter struct {
	http.ResponseWriter
	statusCode int
}

func (rw *responseWriter) WriteHeader(code int) {
	rw.statusCode = code
	rw.ResponseWriter.WriteHeader(code)
}

func Logging(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()
		ww := &responseWriter{ResponseWriter: w, statusCode: http.StatusOK}

		next.ServeHTTP(ww, r)

		slog.Info("request",
			"method", r.Method,
			"path", r.URL.Path,
			"status", ww.statusCode,
			"duration_ms", time.Since(start).Milliseconds(),
			"request_id", RequestIDFromCtx(r.Context()),
		)
	})
}