searcherside/infrastructure/api/middlewares/logging_middleware.go

package middlewares

import (
	"encoding/hex"
	"hash/fnv"
	"log/slog"
	"net/http"
	"strconv"
	"time"

	"code.icb4dc0.de/prskr/searcherside/infrastructure/logging"
)

func LoggingMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
		requestLogger := logging.GetLogger(request.Context()).With(
			slog.String("http.requestId", requestId(request)),
			slog.String("http.method", request.Method),
			slog.String("http.path", request.URL.Path),
		)

		requestLogger.Info("Handling incoming request")
		next.ServeHTTP(writer, request.WithContext(logging.ContextWithLogger(request.Context(), requestLogger)))
		requestLogger.Info("Handled incoming request")
	})
}

func requestId(req *http.Request) string {
	hash := fnv.New64()

	_, _ = hash.Write([]byte(req.Method))
	_, _ = hash.Write([]byte(req.RequestURI))
	_, _ = hash.Write([]byte(req.RemoteAddr))
	_, _ = hash.Write([]byte(req.UserAgent()))
	_, _ = hash.Write(strconv.AppendInt(nil, time.Now().UTC().UnixNano(), 10))

	return hex.EncodeToString(hash.Sum(nil))
}