gohoarder/pkg/logger/middleware.go

package logger

import (
	"net/http"
	"time"

	"github.com/lukaszraczylo/gohoarder/pkg/uuid"
	"github.com/rs/zerolog/log"
)

// responseWriter wraps http.ResponseWriter to capture status code
type responseWriter struct {
	http.ResponseWriter
	statusCode int
	written    int64
}

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

func (rw *responseWriter) Write(b []byte) (int, error) {
	n, err := rw.ResponseWriter.Write(b)
	rw.written += int64(n)
	return n, err
}

// Middleware is HTTP middleware for request logging
func Middleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()

		// Generate request ID
		requestID := r.Header.Get("X-Request-ID")
		if requestID == "" {
			requestID = "req_" + uuid.New().String()[:8]
		}

		// Wrap response writer
		rw := &responseWriter{
			ResponseWriter: w,
			statusCode:     http.StatusOK,
		}

		// Set request ID in response header
		rw.Header().Set("X-Request-ID", requestID)

		// Call next handler
		next.ServeHTTP(rw, r)

		// Log request
		duration := time.Since(start)
		log.Info().
			Str("request_id", requestID).
			Str("method", r.Method).
			Str("path", r.URL.Path).
			Str("remote_addr", r.RemoteAddr).
			Str("user_agent", r.UserAgent()).
			Int("status", rw.statusCode).
			Int64("bytes", rw.written).
			Dur("duration_ms", duration).
			Msg("HTTP request")
	})
}