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rate.go
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rate.go
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// Copyright (c) 2020 by meng. All rights reserved.
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package proxy
import (
"fmt"
"time"
"github.com/mx5566/proxy/leakybucket"
"context"
"golang.org/x/time/rate"
)
type LimitType int
const (
queueLimter LimitType = iota + 1 // 队列模式限流
tokenBucketLimter // golang官方库 golang.org/x/time/rate bucket
slideWindowLimiter // 滑动窗口限流器 tcp滑动窗口
leakBucketLimter // 漏斗桶限流器
)
// 限流接口
type LimitInterface interface {
IsAvalivale() bool
Bind(handler func(conn interface{}))
SetWaitQueue(conn interface{})
}
///////////////////////////////QueueLimiter/////////////////////////////
// 通过队列实现限流
type QueueLimiter struct {
waitQueue chan interface{} // 等待队列类似c网络 listen的backlog
availPools chan bool // 并发连接数
initWaitQueueLen int
initAvailConn int
}
// NewQueueLimter
/**
waitLength-最大的等待处理的长度
maxConn-最大的并发处理长度
**/
func NewQueueLimter(waitLength, maxConn int) *QueueLimiter {
limiter := &QueueLimiter{
waitQueue: make(chan interface{}, waitLength),
availPools: make(chan bool, maxConn),
initWaitQueueLen: waitLength,
initAvailConn: maxConn,
}
// 预先初始化队列的长度,可用队列长度
for i := 0; i < maxConn; i++ {
limiter.availPools <- true
}
return limiter
}
// 等待队列是否还有空位
func (this QueueLimiter) IsAvalivale() bool {
length := len(this.waitQueue)
// 超过了等待队列的数量 说明超过了最大并发持续进行中
if length >= this.initWaitQueueLen {
return false
}
return true
}
// 限流器增加计数
func (this *QueueLimiter) SetWaitQueue(conn interface{}) {
this.waitQueue <- conn
}
func (this QueueLimiter) Bind(handler func(conn interface{})) {
go func() {
for connection := range this.waitQueue {
<-this.availPools
go func(connection interface{}) {
handler(connection)
this.availPools <- true
//logger.Info("conn handle ok on QueueLimiter")
}(connection)
}
}()
}
///////////////////////////////QueueLimiter/////////////////////////////
//////////////////////////////TokenBucketLimiter/////////////////////////////
// 令牌桶实现限流
type TokenBucketLimiter struct {
limiter *rate.Limiter // 令牌桶算法类
handler func(conn interface{})
}
func NewTokenBucketLimiter(t int, token int) *TokenBucketLimiter {
// 800ms
limit := rate.Every(time.Duration(t) * time.Millisecond)
bucket := &TokenBucketLimiter{limiter: rate.NewLimiter(limit, token)}
return bucket
}
func (this *TokenBucketLimiter) IsAvalivale() bool {
ctx, cancel := context.WithCancel(context.Background())
// 取消cancel
defer cancel()
if err := this.limiter.Wait(ctx); err != nil {
logger.Panic(err.Error())
}
return true
}
//
// bind handler function to handler
func (this *TokenBucketLimiter) Bind(handler func(conn interface{})) {
// TODO:
// None
this.handler = handler
}
// call handler function by conn
func (this *TokenBucketLimiter) SetWaitQueue(conn interface{}) {
// TODO:
// None
go func(connection interface{}) {
this.handler(connection)
logger.Info("conn handle ok on BucketLimiter")
}(conn)
}
//////////////////////////////TokenBucketLimiter/////////////////////////////
//////////////////////////////LeakBucketLimiter/////////////////////////////
// 漏斗桶限流算法
type LeakBucketLimiter struct {
limiter leakybucket.BucketI
handler func(conn interface{})
}
func NewLeakBucketLimiter(name string, cap uint, t int) *LeakBucketLimiter {
bucketI, _ := leakybucket.New().Create(name, cap, time.Duration(t)*time.Millisecond)
limit := &LeakBucketLimiter{limiter: bucketI}
return limit
}
func (this *LeakBucketLimiter) IsAvalivale() bool {
if _, err := this.limiter.Add(1); err != nil {
return false
}
return true
}
//
// bind handler function to handler
func (this *LeakBucketLimiter) Bind(handler func(conn interface{})) {
// TODO:
// None
this.handler = handler
}
// call handler function by conn
func (this *LeakBucketLimiter) SetWaitQueue(conn interface{}) {
// TODO:
// None
go func(connection interface{}) {
this.handler(connection)
logger.Info("conn handle ok on BucketLimiter")
}(conn)
}
//////////////////////////////LeakBucketLimiter/////////////////////////////
// 不同的限流器的初始化接口
func CreateLimiter(lConfig LimiterConfig) LimitInterface {
t := LimitType(lConfig.Type)
var limiter LimitInterface
switch t {
case queueLimter:
logger.Info("queueLimter")
limiter = NewQueueLimter(lConfig.WaitQueueLen, lConfig.MaxConn)
case tokenBucketLimter:
logger.Info("tokenBucketLimter")
limiter = NewTokenBucketLimiter(lConfig.Duration, int(lConfig.Captity))
case leakBucketLimter:
logger.Info("leakBucketLimter")
limiter = NewLeakBucketLimiter(lConfig.Name, lConfig.Captity, lConfig.Duration)
case slideWindowLimiter:
logger.Info("slideWindowLimiter not has")
default:
str := fmt.Sprintf("Error Type %d", t)
logger.Error(str)
}
return limiter
}