gateway

gateway

• gateway
  • 1.实例化
  • 2.Option解析
  • 3.在gin中使用
  • 4.用redis做options配置存储
  • 5.用mysql做options配置存储

实例化

gw = NewGateway(0, func() (options []Option) {
    return []Option{
        Option{
            Name:        "登录",
            Path:        "user/login",
            SecondLimit: 100,
            BucketSize: 8,
        },
        Option{
            Name:        "获取轮播图",
            Path:        "config/scrolls",
            SecondLimit: 0,
        },
    }
})

Option解析

type Option struct {
	Name        string `json:"name" yaml:"name"`                       //方法名称
	Path        string `json:"path" yaml:"path"`                       //方法路径
	SecondLimit int    `json:"second_limit" yaml:"second_limit"`       //每秒限速，-1降级，0不限速，默认不限速 
	BucketSize  int    `json:"bucket_size" yaml:"bucket_size"`         //令牌桶限速，桶容量
}

在gin中使用

app.yml

- name: '登录'
  path: '/user/login'
  second_limit: 0

- name: '注册'
  path: '/user/regis'
  second_limit: -1

- name: '获取用户信息'
  path: '/user/info'
  second_limit: 2000
  bucket_size: 20

main.go

package main

import (
  "math/rand"
  "net/http"
  "os"
  "time"

  "github.com/gin-gonic/gin"
  "github.com/grpc-boot/base"
  "github.com/grpc-boot/gateway"
  jsoniter "github.com/json-iterator/go"
)

var (
  gw gateway.Gateway
)

const (
  LogicCode = `logic:code`
)

type Response struct {
  Code int         `json:"code"`
  Msg  string      `json:"msg"`
  Data interface{} `json:"data"`
}

func init() {
  optionFunc := gateway.OptionsWithJsonFile("app.json")
  //optionFunc := gateway.OptionsWithYamlFile("app.yml")
  gw = gateway.NewGateway(0, optionFunc)
}

func response(ctx *gin.Context, code int, msg string, data interface{}) {
  ctx.Set(LogicCode, code)

  result, _ := jsoniter.Marshal(Response{
    Code: code,
    Msg:  msg,
    Data: data,
  })

  ctx.Data(http.StatusOK, "application/json", result)
}

func withGateway() gin.HandlerFunc {
  return func(ctx *gin.Context) {
    path, accessTime := ctx.FullPath(), time.Now()
    status, exists := gw.In(path)

    switch status {
    case gateway.StatusNo:
      var (
        code = http.StatusRequestTimeout
        msg  = "server is busy"
      )

      response(ctx, code, msg, nil)
      gw.Out(accessTime, path, code)
      ctx.Abort()
      return
    case gateway.StatusBusy: //超时
      response(ctx, http.StatusRequestTimeout, "server is busy", nil)
      gw.Out(accessTime, path, http.StatusRequestTimeout)
      ctx.Abort()
      return
    }

    //默认设置为200
    ctx.Set(LogicCode, http.StatusOK)

    //handler
    ctx.Next()

    if exists {
      //网关出
      duration, qps, total, er := gw.Out(accessTime, path, ctx.GetInt(LogicCode))
      base.Green("path:%s duration:%v qps:%d total:%d err:%v", path, duration, qps, total, er)
    }
  }
}

func main() {
  defer gw.Close()

  rand.Seed(time.Now().UnixNano())
  router := gin.New()

  router.Use(withGateway())

  router.GET("/gw", func(ctx *gin.Context) {
    response(ctx, http.StatusOK, "ok", gw.Info())
  })

  router.GET("/user/regis", func(ctx *gin.Context) {
    time.Sleep(time.Millisecond * time.Duration(rand.Int63n(1000)))
    if time.Now().Unix()%2 == 0 {
      response(ctx, http.StatusOK, "ok", nil)
      return
    }

    response(ctx, http.StatusCreated, "ok", nil)
  })

  router.GET("/user/login", func(ctx *gin.Context) {
    time.Sleep(time.Millisecond * time.Duration(rand.Int63n(10)))
    if time.Now().Unix()%2 == 0 {
      response(ctx, http.StatusOK, "ok", nil)
      return
    }

    response(ctx, http.StatusForbidden, "forbidden", nil)
  })

  router.GET("/user/info", func(ctx *gin.Context) {
    time.Sleep(time.Millisecond * time.Duration(rand.Int63n(1000)))

    if time.Now().Unix()%2 == 0 {
      response(ctx, http.StatusOK, "ok", nil)
      return
    }

    response(ctx, http.StatusNotFound, "not found", nil)
  })

  server := &http.Server{
    Addr:    ":8080",
    Handler: router,
  }

  err := server.ListenAndServe()
  if err != nil {
    os.Exit(1)
  }
}

用redis做options配置存储

package main

import (
  "time"

  "github.com/grpc-boot/base"
  "github.com/grpc-boot/gateway"

  redigo "github.com/garyburd/redigo/redis"
  jsoniter "github.com/json-iterator/go"
)

const (
  hashKey   = "gateway:options"
  redisAddr = `127.0.0.1:6379`
)

var (
  redisPool *redigo.Pool
  gw        gateway.Gateway
)

func init() {
  dialOptions := []redigo.DialOption{
    redigo.DialReadTimeout(time.Millisecond * 500),
  }

  redisPool = &redigo.Pool{
    MaxIdle:   1,
    MaxActive: 1,
    Dial: func() (redigo.Conn, error) {
      return redigo.Dial("tcp", redisAddr, dialOptions...)
    },
    TestOnBorrow: func(c redigo.Conn, t time.Time) error {
      if time.Since(t) < time.Minute {
        return nil
      }
      _, err := c.Do("PING")
      return err
    },
  }

  conn := redisPool.Get()
  defer conn.Close()

  args := []interface{}{
    hashKey,
    1,
    `{"name": "登录","path": "/user/login","second_limit": 0}`,
    2,
    `{"name": "注册","path": "/user/regis","second_limit": -1}`,
    3,
    `{"name": "获取用户信息","path": "/user/info","second_limit": 1000, "bucket_size": 10}`,
  }

  _, err := conn.Do("HMSET", args...)
  if err != nil {
    base.RedFatal("set redis config err:%s", err.Error())
  }
}

func main() {
  gw = gateway.NewGateway(time.Second, gateway.OptionsWithRedis(redisPool, hashKey))

  go func() {
    for {
      info, _ := jsoniter.Marshal(gw.Info())
      base.Green("%s", string(info))
      time.Sleep(time.Second)
    }
  }()

  var wa chan struct{}
  <-wa

  gw.Close()
}

用mysql做options配置存储

package main

import (
  "database/sql"
  "sync"
  "time"

  "github.com/grpc-boot/base"
  "github.com/grpc-boot/gateway"

  _ "github.com/go-sql-driver/mysql"
)

/**
CREATE TABLE `gateway` (
  `id` int unsigned NOT NULL AUTO_INCREMENT COMMENT '主键',
  `name` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT '' COMMENT '名称',
  `path` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT '' COMMENT '路径',
  `second_limit` int DEFAULT '5000' COMMENT '每秒请求数',
  `bucket_size` int unsigned DEFAULT '8' COMMENT '桶容量',
  PRIMARY KEY (`id`),
  UNIQUE KEY `path` (`path`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
*/

const (
  tableName = "gateway"
  dsn       = `root:12345678@tcp(127.0.0.1:3306)/dd?timeout=5s&readTimeout=6s`
)

var (
  cache sync.Map
  db    *sql.DB
  gw    gateway.Gateway
)

func init() {
  var err error
  db, err = sql.Open("mysql", dsn)
  if err != nil {
    base.RedFatal("open mysql err:%s", err.Error())
  }

  db.SetConnMaxLifetime(time.Second * 100)
  db.SetConnMaxIdleTime(time.Second * 100)
  db.SetMaxOpenConns(5)
  db.SetMaxIdleConns(5)

  args := []interface{}{
    "登录", "/user/login", "0", "10",
    "注册", "/user/regis", "-1", "3",
    "获取用户信息", "/user/info", "10", "8",
  }

  _, err = db.Exec("INSERT IGNORE INTO `gateway`(`name`,`path`,`second_limit`,`bucket_size`)VALUES(?,?,?,?),(?,?,?,?),(?,?,?,?)", args...)
  if err != nil {
    base.RedFatal("insert config err:%s", err.Error())
  }
}

func main() {
  gw = gateway.NewGateway(time.Second, gateway.OptionsWithDb(db, tableName))

  cache.Store("gw", gw)

  /*go func() {
  	for {
  		info, _ := jsoniter.Marshal(gw.Info())
  		base.Green("%s", string(info))
  		time.Sleep(time.Second)
  	}
  }()*/

  for i := 1; i < 8; i++ {
    go access()
  }

  var wa chan struct{}
  <-wa

  gw.Close()
}

func access() {
  for {
    go func() {
      val, _ := cache.Load("gw")
      gwy, _ := val.(gateway.Gateway)
      status, _ := gwy.In("/user/info")
      base.Fuchsia("%d", status)
    }()
    time.Sleep(time.Millisecond * 10)
  }
}