feat: added API gateway

internal/gw/middleware/logging.go

@@ -0,0 +1,47 @@
+package middleware
+
+import (
+	"log"
+	"net/http"
+	"time"
+)
+
+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
+}
+
+func LoggingMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		start := time.Now()
+
+		wrapped := &responseWriter{
+			ResponseWriter: w,
+			statusCode:     http.StatusOK,
+		}
+
+		next.ServeHTTP(wrapped, r)
+
+		duration := time.Since(start)
+		log.Printf(
+			"%s %s %d %s %s",
+			r.Method,
+			r.RequestURI,
+			wrapped.statusCode,
+			duration,
+			r.RemoteAddr,
+		)
+	})
+}