一，安装用到的库

1,从命令行安装 x/time/rate库

iuhongdi@ku:~$ go get -u golang.org/x/time/rate

说明：刘宏缔的go森林是一个专注golang的博客，
          地址：https://blog.csdn.net/weixin_43881017

说明：作者:刘宏缔 邮箱: [email protected]

二，演示项目的相关信息

1,地址:

https://github.com/liuhongdi/digv14

2,功能说明：

          演示了针对ip的地址的限流，

          限制同一ip地址在单位时间内可以发起请求的次数

3，项目结构：如图:

三，配置文件

config/config.yaml

1.  
   Database:
2.  
   DBType: mysql
3.  
   UserName: root
4.  
   Password: password
5.  
   Host: 127.0.0.1:3306
6.  
   DBName: dig
7.  
   Charset: utf8
8.  
   ParseTime: True
9.  
   MaxIdleConns: 10
10.  
    MaxOpenConns: 30
11.  
    Server:
12.  
    RunMode: debug
13.  
    HttpPort: 8000
14.  
    ReadTimeout: 60
15.  
    WriteTimeout: 60
16.  
    Log:
17.  
    LogFilePath: /data/gologs/logs
18.  
    LogInfoFileName: info
19.  
    LogWarnFileName: warn
20.  
    LogFileExt: log
21.  
    AccessLog:
22.  
    LogFilePath: /data/gologs/logs
23.  
    LogFileName: access
24.  
    LogFileExt: log
25.  
    Limiter:
26.  
    CountPerSecond: 7

四，go代码说明

1,global/limiter.go

1.  
   package global
2.  
    
3.  
   import (
4.  
   "golang.org/x/time/rate"
5.  
   "sync"
6.  
   )
7.  
    
8.  
   type IPRateLimiter struct {
9.  
   ips map[string]*rate.Limiter
10.  
    mu *sync.RWMutex
11.  
    r rate.Limit
12.  
    b int
13.  
    }
14.  
     
15.  
    var (
16.  
    RateLimiter *IPRateLimiter
17.  
    )
18.  
     
19.  
    // 创建一个RateLimiter
20.  
    func SetupIPRateLimiter() (error) {
21.  
    var r rate.Limit
22.  
    r=1
23.  
    b := LimiterSetting.CountPerSecond
24.  
    RateLimiter = &IPRateLimiter{
25.  
    ips: make(map[string]*rate.Limiter),
26.  
    mu: &sync.RWMutex{},
27.  
    r: r,
28.  
    b: b,
29.  
    }
30.  
    return nil
31.  
    }
32.  
     
33.  
    // 添加一个ip到map
34.  
    func (i *IPRateLimiter) AddIP(ip string) *rate.Limiter {
35.  
    i.mu.Lock()
36.  
    defer i.mu.Unlock()
37.  
     
38.  
    limiter := rate.NewLimiter(i.r, i.b)
39.  
    i.ips[ip] = limiter
40.  
    return limiter
41.  
    }
42.  
     
43.  
    //通过ip得到limiter
44.  
    func (i *IPRateLimiter) GetLimiter(ip string) *rate.Limiter {
45.  
    i.mu.Lock()
46.  
    limiter, exists := i.ips[ip]
47.  
    if !exists {
48.  
    i.mu.Unlock()
49.  
    return i.AddIP(ip)
50.  
    }
51.  
    i.mu.Unlock()
52.  
    return limiter
53.  
    }

2,global/setting.go

1.  
   package global
2.  
    
3.  
   import (
4.  
   "fmt"
5.  
   "github.com/liuhongdi/digv14/pkg/setting"
6.  
   "time"
7.  
   )
8.  
   //服务器配置
9.  
   type ServerSettingS struct {
10.  
    RunMode string
11.  
    HttpPort string
12.  
    ReadTimeout time.Duration
13.  
    WriteTimeout time.Duration
14.  
    }
15.  
    //数据库配置
16.  
    type DatabaseSettingS struct {
17.  
    DBType string
18.  
    UserName string
19.  
    Password string
20.  
    Host string
21.  
    DBName string
22.  
    Charset string
23.  
    ParseTime bool
24.  
    MaxIdleConns int
25.  
    MaxOpenConns int
26.  
    }
27.  
    //日志配置
28.  
    type LogSettingS struct {
29.  
    LogFilePath string //保存到的目录
30.  
    LogInfoFileName string //info级日志文件的名字
31.  
    LogWarnFileName string //warn级日志文件的名字
32.  
    LogAccessFileName string //Access日志文件的名字
33.  
    LogFileExt string //文件的扩展名
34.  
    }
35.  
    //访问日志配置
36.  
    type AccessLogSettingS struct {
37.  
    LogFilePath string //保存到的目录
38.  
    LogFileName string //Access日志文件的名字
39.  
    LogFileExt string //文件的扩展名
40.  
    }
41.  
    //限流配置
42.  
    type LimiterSettingS struct {
43.  
    CountPerSecond int //每秒的访问次数
44.  
    }
45.  
    //定义全局变量
46.  
    var (
47.  
    ServerSetting *ServerSettingS
48.  
    DatabaseSetting *DatabaseSettingS
49.  
    LogSetting *LogSettingS
50.  
    AccessLogSetting *AccessLogSettingS
51.  
    LimiterSetting *LimiterSettingS
52.  
    )
53.  
     
54.  
    //读取配置到全局变量
55.  
    func SetupSetting() error {
56.  
    s, err := setting.NewSetting()
57.  
    if err != nil {
58.  
    return err
59.  
    }
60.  
    err = s.ReadSection("Database", &DatabaseSetting)
61.  
    if err != nil {
62.  
    return err
63.  
    }
64.  
     
65.  
    err = s.ReadSection("Server", &ServerSetting)
66.  
    if err != nil {
67.  
    return err
68.  
    }
69.  
     
70.  
    err = s.ReadSection("Log", &LogSetting)
71.  
    if err != nil {
72.  
    return err
73.  
    }
74.  
     
75.  
    err = s.ReadSection("AccessLog", &AccessLogSetting)
76.  
    if err != nil {
77.  
    return err
78.  
    }
79.  
     
80.  
    err = s.ReadSection("Limiter", &LimiterSetting)
81.  
    if err != nil {
82.  
    return err
83.  
    }
84.  
     
85.  
    fmt.Println("setting:")
86.  
    fmt.Println(ServerSetting)
87.  
    fmt.Println(DatabaseSetting)
88.  
    fmt.Println(LogSetting)
89.  
    fmt.Println(AccessLogSetting)
90.  
    fmt.Println(LimiterSetting)
91.  
    return nil
92.  
    }

3,main.go

1.  
   package main
2.  
    
3.  
   import (
4.  
   "github.com/gin-gonic/gin"
5.  
   _ "github.com/jinzhu/gorm/dialects/mysql"
6.  
   "github.com/liuhongdi/digv14/global"
7.  
   "github.com/liuhongdi/digv14/router"
8.  
   "log"
9.  
   )
10.  
     
11.  
    //init
12.  
    func init() {
13.  
    //setting
14.  
    err := global.SetupSetting()
15.  
    if err != nil {
16.  
    log.Fatalf("init.setupSetting err: %v", err)
17.  
    }
18.  
     
19.  
    //logger
20.  
    err = global.SetupLogger()
21.  
    if err != nil {
22.  
    log.Fatalf("init.SetupLogger err: %v", err)
23.  
    }
24.  
     
25.  
    //access logger
26.  
    err = global.SetupAccessLogger()
27.  
    if err != nil {
28.  
    log.Fatalf("init.SetupAccessLogger err: %v", err)
29.  
    }
30.  
     
31.  
    //db
32.  
    err = global.SetupDBLink()
33.  
    if err != nil {
34.  
    log.Fatalf("init.SetupLogger err: %v", err)
35.  
    global.Logger.Fatalf("init.setupDBEngine err: %v", err)
36.  
    }
37.  
     
38.  
    //ratelimiter
39.  
    err = global.SetupIPRateLimiter()
40.  
    if err != nil {
41.  
    log.Fatalf("init.SetupIPRateLimiter err: %v", err)
42.  
    global.Logger.Fatalf("init.SetupIPRateLimiter err: %v", err)
43.  
    }
44.  
     
45.  
    global.Logger.Infof("------应用init结束")
46.  
    //global.Logger.
47.  
    }
48.  
     
49.  
    func main() {
50.  
    global.Logger.Infof("------应用main函数开始")
51.  
    //设置运行模式
52.  
    gin.SetMode(global.ServerSetting.RunMode)
53.  
    //引入路由
54.  
    r := router.Router()
55.  
    //run
56.  
    r.Run(":"+global.ServerSetting.HttpPort)
57.  
    }

4,middleware/limit.go

1.  
   package middleware
2.  
    
3.  
   import (
4.  
   "fmt"
5.  
   "github.com/gin-gonic/gin"
6.  
   "github.com/liuhongdi/digv14/global"
7.  
   "github.com/liuhongdi/digv14/pkg/result"
8.  
   "github.com/liuhongdi/digv14/pkg/util"
9.  
   )
10.  
    //限流器
11.  
    func LimitMiddleware() gin.HandlerFunc {
12.  
    return func(c *gin.Context) {
13.  
    //得到ip地址
14.  
    ipAddr:=util.GetRealIp(c)
15.  
    fmt.Println("current ip:"+ipAddr)
16.  
    //ipAddr:="127.0.0.1"
17.  
    limiter := global.RateLimiter.GetLimiter(ipAddr)
18.  
    if !limiter.Allow() {
19.  
    fmt.Println("not allow,will return")
20.  
    resultRes := result.NewResult(c)
21.  
    resultRes.Error(2004,"访问超出限制")
22.  
    return
23.  
    } else {
24.  
    fmt.Println("allow,next")
25.  
    c.Next()
26.  
    }
27.  
    }
28.  
    }

5,router/router.go

1.  
   package router
2.  
    
3.  
   import (
4.  
   "github.com/gin-gonic/gin"
5.  
   "github.com/liuhongdi/digv14/controller"
6.  
   "github.com/liuhongdi/digv14/global"
7.  
   "github.com/liuhongdi/digv14/middleware"
8.  
   "github.com/liuhongdi/digv14/pkg/result"
9.  
   "runtime/debug"
10.  
    )
11.  
     
12.  
    func Router() *gin.Engine {
13.  
    router := gin.Default()
14.  
    //处理异常
15.  
    router.NoRoute(HandleNotFound)
16.  
    router.NoMethod(HandleNotFound)
17.  
    //router.Use(middleware.AccessLog())
18.  
    router.Use(middleware.AccessLog()).Use(middleware.LimitMiddleware())
19.  
    router.Use(Recover)
20.  
     
21.  
    // 路径映射
22.  
    articlec:=controller.NewArticleController()
23.  
    router.GET("/article/getone/:id", articlec.GetOne);
24.  
    router.GET("/article/list", articlec.GetList);
25.  
    return router
26.  
    }
27.  
     
28.  
    //404
29.  
    func HandleNotFound(c *gin.Context) {
30.  
    global.Logger.Errorf("handle not found: %v", c.Request.RequestURI)
31.  
    //global.Logger.Errorf("stack: %v",string(debug.Stack()))
32.  
    result.NewResult(c).Error(404,"资源未找到")
33.  
    return
34.  
    }
35.  
     
36.  
    //500
37.  
    func Recover(c *gin.Context) {
38.  
    defer func() {
39.  
    if r := recover(); r != nil {
40.  
    //打印错误堆栈信息
41.  
    //log.Printf("panic: %v\n", r)
42.  
    global.Logger.Errorf("panic: %v", r)
43.  
    //log stack
44.  
    global.Logger.Errorf("stack: %v",string(debug.Stack()))
45.  
    //print stack
46.  
    debug.PrintStack()
47.  
    //return
48.  
    result.NewResult(c).Error(500,"服务器内部错误")
49.  
    }
50.  
    }()
51.  
    //继续后续接口调用
52.  
    c.Next()
53.  
    }

6,其他相关代码可访问github.com

五，测试效果

1.  
   root@ku:/data/liuhongdi/digv14# ab -n 50 -c 50 http://127.0.0.1:8000/article/list
2.  
   This is ApacheBench, Version 2.3 <$Revision: 1879490 $>
3.  
   Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
4.  
   Licensed to The Apache Software Foundation, http://www.apache.org/
5.  
    
6.  
   Benchmarking 127.0.0.1 (be patient).....done
7.  
    
8.  
    
9.  
   Server Software:
10.  
    Server Hostname: 127.0.0.1
11.  
    Server Port: 8000
12.  
     
13.  
    Document Path: /article/list
14.  
    Document Length: 821 bytes
15.  
     
16.  
    Concurrency Level: 50
17.  
    Time taken for tests: 0.056 seconds
18.  
    Complete requests: 50
19.  
    Failed requests: 43
20.  
    (Connect: 0, Receive: 0, Length: 43, Exceptions: 0)
21.  
    Non-2xx responses: 43
22.  
    Total transferred: 14441 bytes
23.  
    HTML transferred: 7897 bytes
24.  
    Requests per second: 894.84 [#/sec] (mean)
25.  
    Time per request: 55.876 [ms] (mean)
26.  
    Time per request: 1.118 [ms] (mean, across all concurrent requests)
27.  
    Transfer rate: 252.39 [Kbytes/sec] received
28.  
     
29.  
    Connection Times (ms)
30.  
    min mean[+/-sd] median max
31.  
    Connect: 0 7 2.0 7 9
32.  
    Processing: 10 25 9.0 25 41
33.  
    Waiting: 3 24 9.3 24 41
34.  
    Total: 12 31 9.5 33 46
35.  
     
36.  
    Percentage of the requests served within a certain time (ms)
37.  
    50% 33
38.  
    66% 37
39.  
    75% 38
40.  
    80% 40
41.  
    90% 43
42.  
    95% 46
43.  
    98% 46
44.  
    99% 46
45.  
    100% 46 (longest request)

一秒时间内，只有7次成功的访问，

和我们在配置文件中设置的CountPerSecond的值是一致的

六，查看库的版本:

1.  
   module github.com/liuhongdi/digv14
2.  
    
3.  
   go 1.15
4.  
    
5.  
   require (
6.  
   github.com/gin-gonic/gin v1.6.3
7.  
   github.com/go-playground/universal-translator v0.17.0
8.  
   github.com/go-playground/validator/v10 v10.2.0
9.  
   github.com/jinzhu/gorm v1.9.16
10.  
    github.com/lestrrat/go-file-rotatelogs v0.0.0-20180223000712-d3151e2a480f
11.  
    github.com/lestrrat/go-strftime v0.0.0-20180220042222-ba3bf9c1d042 // indirect
12.  
    github.com/magiconair/properties v1.8.4 // indirect
13.  
    github.com/mitchellh/mapstructure v1.3.3 // indirect
14.  
    github.com/pelletier/go-toml v1.8.1 // indirect
15.  
    github.com/pkg/errors v0.9.1 // indirect
16.  
    github.com/spf13/afero v1.4.1 // indirect
17.  
    github.com/spf13/cast v1.3.1 // indirect
18.  
    github.com/spf13/jwalterweatherman v1.1.0 // indirect
19.  
    github.com/spf13/pflag v1.0.5 // indirect
20.  
    github.com/spf13/viper v1.7.1
21.  
    go.uber.org/multierr v1.6.0 // indirect
22.  
    go.uber.org/zap v1.16.0
23.  
    golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 // indirect
24.