what-is-my-ip/logger.go

package main

import (
	"log"
	"net/http"
	"os"
	"time"
)

// Logger type
type Logger struct {
	logger *log.Logger
}

// NewLogger returns a logger interface
func NewLogger() *Logger {
	return &Logger{
		logger: log.New(os.Stdout, appLabel, log.Ldate|log.Lmicroseconds),
	}
}

// Println is proxy for println
func (l *Logger) Println(v ...interface{}) {
	l.logger.Println(v...)
}

// Printf calls Printf on logger
func (l *Logger) Printf(f string, v ...interface{}) {
	l.logger.Printf(f, v...)
}

func (l *Logger) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
	start := time.Now()
	next(rw, r)
	l.logger.Printf("Completed %s to %s in %v", r.Method, r.URL.Path, time.Since(start))
}