使用gin中间件记录访问日志

package main

import (
    "fmt"
    "github.com/gin-gonic/gin"
    "time"
)

func main() {
    r := gin.New()
    r.Use(AccessLog())

    handlers := func(c *gin.Context) {
        c.JSON(200, "index")
    }

    r.GET("/", handlers)

    r.Run(":8080")
}

func AccessLog() gin.HandlerFunc {
    return func(c *gin.Context) {
        startTime := time.Now()
        c.Next()
        latency := time.Since(startTime)
        referer := c.Request.Referer()
        if referer == "" {
            referer = "-"
        }

        accessStr := fmt.Sprintf("%s %s %s %s %s %s %d %d",
            c.ClientIP(),
            time.Now().UTC().Format("2006-01-02 15:04:05.000z"),
            c.Request.Method,
            c.Request.Host,
            referer,
            c.Request.URL,
            c.Writer.Status(),
            latency.Nanoseconds()/1000000)

        fmt.Println(accessStr)
    }
}

输出如下：
127.0.0.1 2022-05-14 20:08:17.574z GET 127.0.0.1:8080 - / 200 0