概述
首先同步下项目概况:
上篇文章分享了,规划项目目录和参数验证,其中参数验证使用的是 validator.v8 版本,现已更新到 validator.v9 版本,最新代码查看 github 即可。
这篇文章咱们分享:路由中间件 - 日志记录。
日志是特别重要的一个东西,方便我们对问题进行排查,这篇文章我们实现将日志记录到文本文件中。
这是我规划的,需要记录的参数:
- request 请求数据
- request_time
- request_method
- request_uri
- request_proto
- request_ua
- request_referer
- request_post_data
- request_client_ip
- response 返回数据
- response_time
- response_code
- response_msg
- response_data
- cost_time 花费时间
Gin 框架中自带 Logger 中间件,我们了解下框架中自带的 Logger 中间件是否满足我们的需求?
gin.Logger()
我们先使用 gin.Logger() 看看效果。
在 route.go SetupRouter 方法中增加代码:
engine.Use(gin.Logger())
运行后多请求几次,日志输出在命令行中:
[GIN] 2019/08/30 - 21:24:16 | 200 | 178.072µs | ::1 | GET /ping
[GIN] 2019/08/30 - 21:24:27 | 200 | 367.997µs | ::1 | POST /product
[GIN] 2019/08/30 - 21:24:28 | 200 | 2.521592ms | ::1 | POST /product
先解决第一个问题,怎么将日志输出到文本中?
在 route.go SetupRouter 方法中增加代码:
f, _ := os.Create(config.AppAccessLogName)
gin.DefaultWriter = io.MultiWriter(f)
engine.Use(gin.Logger())
运行后多请求几次,日志输出在文件中:
[GIN] 2019/08/30 - 21:36:07 | 200 | 369.023µs | ::1 | GET /ping
[GIN] 2019/08/30 - 21:36:08 | 200 | 27.585µs | ::1 | GET /ping
[GIN] 2019/08/30 - 21:36:10 | 200 | 14.302µs | ::1 | POST /product
虽然记录到文件成功了,但是记录的参数不是我们想要的样子。
怎么办呢?
我们需要自定义一个日志中间件,按照我们需要的参数进行记录。
自定义 Logger()
middleware/logger/logger.go
package logger
import (
"bytes"
"encoding/json"
"fmt"
"github.com/gin-gonic/gin"
"go-gin-api/app/config"
"go-gin-api/app/util"
"log"
"os"
)
type bodyLogWriter struct {
gin.ResponseWriter
body *bytes.Buffer
}
func (w bodyLogWriter) Write(b []byte) (int, error) {
w.body.Write(b)
return w.ResponseWriter.Write(b)
}
func (w bodyLogWriter) WriteString(s string) (int, error) {
w.body.WriteString(s)
return w.ResponseWriter.WriteString(s)
}
func SetUp() gin.HandlerFunc {
return func(c *gin.Context) {
bodyLogWriter := &bodyLogWriter{body: bytes.NewBufferString(""), ResponseWriter: c.Writer}
c.Writer = bodyLogWriter
//开始时间
startTime := util.GetCurrentMilliTime()
//处理请求
c.Next()
responseBody := bodyLogWriter.body.String()
var responseCode int
var responseMsg string
var responseData interface{}
if responseBody != "" {
response := util.Response{}
err := json.Unmarshal([]byte(responseBody), &response)
if err == nil {
responseCode = response.Code
responseMsg = response.Message
responseData = response.Data
}
}
//结束时间
endTime := util.GetCurrentMilliTime()
if c.Request.Method == "POST" {
c.Request.ParseForm()
}
//日志格式
accessLogMap := make(map[string]interface{})
accessLogMap["request_time"] = startTime
accessLogMap["request_method"] = c.Request.Method
accessLogMap["request_uri"] = c.Request.RequestURI
accessLogMap["request_proto"] = c.Request.Proto
accessLogMap["request_ua"] = c.Request.UserAgent()
accessLogMap["request_referer"] = c.Request.Referer()
accessLogMap["request_post_data"] = c.Request.PostForm.Encode()
accessLogMap["request_client_ip"] = c.ClientIP()
accessLogMap["response_time"] = endTime
accessLogMap["response_code"] = responseCode
accessLogMap["response_msg"] = responseMsg
accessLogMap["response_data"] = responseData
accessLogMap["cost_time"] = fmt.Sprintf("%vms", endTime - startTime)
accessLogJson, _ := util.JsonEncode(accessLogMap)
if f, err := os.OpenFile(config.AppAccessLogName, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0666); err != nil {
log.Println(err)
} else {
f.WriteString(accessLogJson + "
")
}
}
}
运行后多请求几次,日志输出在文件中:
{"cost_time":"0ms","request_client_ip":"::1","request_method":"GET","request_post_data":"","request_proto":"HTTP/1.1","request_referer":"","request_time":1567172568233,"request_ua":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36","request_uri":"/ping","response_code":1,"response_data":null,"response_msg":"pong","response_time":1567172568233}
{"cost_time":"0ms","request_client_ip":"::1","request_method":"GET","request_post_data":"","request_proto":"HTTP/1.1","request_referer":"","request_time":1567172569158,"request_ua":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36","request_uri":"/ping","response_code":1,"response_data":null,"response_msg":"pong","response_time":1567172569158}
{"cost_time":"0ms","request_client_ip":"::1","request_method":"POST","request_post_data":"name=admin","request_proto":"HTTP/1.1","request_referer":"","request_time":1567172629565,"request_ua":"PostmanRuntime/7.6.0","request_uri":"/product","response_code":-1,"response_data":null,"response_msg":"Key: 'ProductAdd.Name' Error:Field validation for 'Name' failed on the 'NameValid' tag","response_time":1567172629565}
OK,咱们想要的所有参数全都记录了!
抛出几个问题吧:
1、有没有开源的日志记录工具?
当然有,其中 logrus 是用的最多的,这个工具功能强大,原来我也分享过,可以看下原来的文章《使用 logrus 进行日志收集》。
2、为什么将日志记录到文本中?
因为,日志平台可以使用的是 ELK。
使用 Logstash 进行收集文本文件,使用 Elasticsearch 引擎进行搜索分析,最终在 Kibana 平台展示出来。
3、当大量请求过来时,写入文件会不会出问题?
可能会,这块可以使用异步,咱们可以用下 go 的 chan,具体实现看代码吧,我就不贴了。
源码地址
https://github.com/xinliangnote/go-gin-api