http-boot-server/bootserver/middlewares/logger.go

package middlewares

import (
	"net"
	"net/http"
	"time"

	"git.faercol.me/faercol/http-boot-server/bootserver/helpers"
	"github.com/sirupsen/logrus"
)

var defaultResponseInfo = helpers.ResponseInfo{
	ReturnCode:    -1,
	ContentLength: -1,
}

type LoggerMiddleware struct {
	l *logrus.Logger
}

func (lm *LoggerMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	responseInfo, ok := r.Context().Value(helpers.ResponseInfoKey).(helpers.ResponseInfo)
	if !ok {
		lm.l.Errorf("Failed to read response info from context, got %v", r.Context().Value("response_info"))
		responseInfo = defaultResponseInfo
	}
	method := r.Method
	route := r.RequestURI
	currentTime := time.Now().UTC()
	httpVersion := r.Proto

	clientIP, _, err := net.SplitHostPort(r.RemoteAddr)
	if err != nil {
		lm.l.Errorf("Failed to read remote IP: %s", err.Error())
		clientIP = "unknown"
	}

	lm.l.Infof(`%s - [%s] "%s %s %s" %d %d`, clientIP, currentTime.Format(time.RFC3339), method, route, httpVersion, responseInfo.ReturnCode, responseInfo.ContentLength)
}