由于时间流逝,代码库更新,现在下面的代码已经不适用了,我写了一遍文章更新了代码
传送门 golang使用redis分布式锁 [2020年更新]
昨天由于项目需求,需要使用redis分布式锁,在网上找了半天,也没有找到一个简单的教程,经过自己研究,了解简单使用方法,都可以直接拿过来自己用,下面我就发出来给大家分享一下。
- 首先下载 /garyburd/redigo,因为这个分布式锁是根据上面所实现;
- 下载 /redsync.v1 这个就是实现分布式锁的源代码(如果测试需要下载 /stvp/tempredis);
- 我在Windows上不能运行,因为不支持,在Liunx上完美运行,其他的就没有试过了;
- 我们先来看下源码
package redsync
import (
"crypto/rand"
"encoding/base64"
"sync"
"time"
"/garyburd/redigo/redis"
)
// A Mutex is a distributed mutual exclusion lock.
type Mutex struct {
name string
expiry
tries int
delay
factor float64
quorum int
value string
until
nodem
pools []Pool
}
name string //命名一个名字
expiry //最多可以获取锁的时间,超过自动解锁
tries int //失败最多获取锁的次数
delay //获取锁失败后等待多少时间后重试
factor float64
quorum int
value string //每一个锁独有一个值,
until
nodem
pools []Pool //连接池
// New creates and returns a new Redsync instance from given Redis connection pools.
func New(pools []Pool) *Redsync {
return &Redsync{
pools: pools,
}
}
// NewMutex returns a new distributed mutex with given name.
func (r *Redsync) NewMutex(name string, options ...Option) *Mutex {
m := &Mutex{
name: name,
expiry: 8 * ,
tries: 32,
delay: 500 * ,
factor: 0.01,
quorum: len()/2 + 1,
pools: ,
}
for _, o := range options {
(m)
}
return m
}
// An Option configures a mutex.
type Option interface {
Apply(*Mutex)
}
// OptionFunc is a function that configures a mutex.
type OptionFunc func(*Mutex)
// Apply calls f(mutex)
func (f OptionFunc) Apply(mutex *Mutex) {
f(mutex)
}
// SetExpiry can be used to set the expiry of a mutex to the given value.
func SetExpiry(expiry ) Option {
return OptionFunc(func(m *Mutex) {
= expiry
})
}
// SetTries can be used to set the number of times lock acquire is attempted.
func SetTries(tries int) Option {
return OptionFunc(func(m *Mutex) {
= tries
})
}
// SetRetryDelay can be used to set the amount of time to wait between retries.
func SetRetryDelay(delay ) Option {
return OptionFunc(func(m *Mutex) {
= delay
})
}
// SetDriftFactor can be used to set the clock drift factor.
func SetDriftFactor(factor float64) Option {
return OptionFunc(func(m *Mutex) {
= factor
})
}
这里的SET*方法,是自定义设置Mutex的参数
下面就分享出自己写的测试代码
package main
import (
"/redsync.v1"
"testing"
"/garyburd/redigo/redis"
"time"
"fmt"
)
//redis命令执行函数
func DoRedisCmdByConn(conn *,commandName string, args ...interface{}) (interface{}, error) {
redisConn := ()
defer ()
//检查与redis的连接
return (commandName, args...)
}
func TestRedis(t *) {
//单个锁
//pool := newPool()
//rs := ([]{pool})
//mutex1 := ("test-redsync1")
//
//()
//conn := ()
//("SET","name1","ywb1")
//()
//()
curtime := ().UnixNano()
//多个同时访问
pool := newPool()
mutexes := newTestMutexes([]{pool}, "test-mutex", 2)
orderCh := make(chan int)
for i,v :=range mutexes {
go func(i int,mutex *) {
if err := (); err != nil {
("Expected err == nil, got %q", err)
return
}
(i,"add lock ....")
conn := ()
DoRedisCmdByConn(pool,"SET",("name%v",i),("name%v",i))
str,_ := (DoRedisCmdByConn(pool,"GET",("name%v",i))
(str)
DoRedisCmdByConn(pool,"DEL",("name%v",i))
()
()
(i,"del lock ....")
orderCh <- i
}(i,v)
}
for range mutexes {
<-orderCh
}
(().UnixNano() - curtime )
}
func newTestMutexes(pools [], name string, n int) []* {
mutexes := []*{}
for i := 0; i < n; i++ {
mutexes = append(mutexes,(pools).NewMutex(name,
((2)*),
((10)*)),
)
}
return mutexes
}
func newPool() * {
return &{
MaxIdle: 3,
IdleTimeout: (24) * ,
Dial: func() (, error) {
c, err := ("tcp", "127.0.0.1:6379")
if err != nil {
panic(())
//("redis", "load redis redisServer err, %s", ())
return nil, err
}
return c, err
},
TestOnBorrow: func(c , t ) error {
_, err := ("PING")
if err != nil {
//("redis", "ping redis redisServer err, %s", ())
return err
}
return err
},
}
}
这就是代码实现,可以自己封装,也可以拿去直接用。