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package middleware
import (
"bytes"
"fmt"
"log/slog"
"net/http"
"os"
"time"
)
type LoggingResponseWriter struct {
http.ResponseWriter
statusCode int
responseBody *bytes.Buffer
}
func (w *LoggingResponseWriter) WriteHeader(code int) {
w.statusCode = code
w.ResponseWriter.WriteHeader(code)
}
func (w *LoggingResponseWriter) Write(b []byte) (int, error) {
w.responseBody.Write(b)
return w.ResponseWriter.Write(b)
}
func LoggingMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
start := time.Now()
rw := &LoggingResponseWriter{
ResponseWriter: w,
statusCode: http.StatusOK,
responseBody: &bytes.Buffer{},
}
jsonHandler := slog.NewJSONHandler(os.Stderr, nil)
myslog := slog.New(jsonHandler)
next.ServeHTTP(rw, r)
if rw.statusCode >= 400 {
myslog.Error("Request", "IP", r.RemoteAddr, "Method", r.Method, "Path", r.URL.Path, "Status",
rw.statusCode, "Duration", fmt.Sprint(time.Since(start)), "Response", rw.responseBody.String())
} else {
myslog.Info("Request", "IP", r.RemoteAddr, "Method", r.Method, "Path", r.URL.Path, "Status",
rw.statusCode, "Duration", fmt.Sprint(time.Since(start)))
}
})
}
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