go redis分散ロックの実現
githubをダウンロードします.com/garyburd/redigo、この分散ロックは上述したように実現される.ダウンロードgopkg.in/redsync.v 1これは分散ロックを実現するソースコードである(github.com/stvp/tempredisをダウンロードする必要がある場合).
ソースを見て
//ここのSET*メソッドは、Mutexのパラメータをカスタマイズする方法です
//次はテストコード
ソースを見て
package redsync
import (
"crypto/rand"
"encoding/base64"
"sync"
"time"
"github.com/garyburd/redigo/redis"
)
// A Mutex is a distributed mutual exclusion lock.
type Mutex struct {
name string
expiry time.Duration
tries int
delay time.Duration
factor float64
quorum int
value string
until time.Time
nodem sync.Mutex
pools []Pool
}
name string //
expiry time.Duration // ,
tries int //
delay time.Duration //
factor float64
quorum int
value string // ,
until time.Time
nodem sync.Mutex
pools []Pool //
// 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 * time.Second,
tries: 32,
delay: 500 * time.Millisecond,
factor: 0.01,
quorum: len(r.pools)/2 + 1,
pools: r.pools,
}
for _, o := range options {
o.Apply(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 time.Duration) Option {
return OptionFunc(func(m *Mutex) {
m.expiry = 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) {
m.tries = tries
})
}
// SetRetryDelay can be used to set the amount of time to wait between retries.
func SetRetryDelay(delay time.Duration) Option {
return OptionFunc(func(m *Mutex) {
m.delay = delay
})
}
// SetDriftFactor can be used to set the clock drift factor.
func SetDriftFactor(factor float64) Option {
return OptionFunc(func(m *Mutex) {
m.factor = factor
})
}
//ここのSET*メソッドは、Mutexのパラメータをカスタマイズする方法です
//次はテストコード
package main
import (
"gopkg.in/redsync.v1"
"testing"
"github.com/garyburd/redigo/redis"
"time"
"fmt"
)
//redis
func DoRedisCmdByConn(conn *redis.Pool,commandName string, args ...interface{}) (interface{}, error) {
redisConn := conn.Get()
defer redisConn.Close()
// redis
return redisConn.Do(commandName, args...)
}
func TestRedis(t *testing.T) {
//
//pool := newPool()
//rs := redsync.New([]redsync.Pool{pool})
//mutex1 := rs.NewMutex("test-redsync1")
//
//mutex1.Lock()
//conn := pool.Get()
//conn.Do("SET","name1","ywb1")
//conn.Close()
//mutex1.Unlock()
curtime := time.Now().UnixNano()
//
pool := newPool()
mutexes := newTestMutexes([]redsync.Pool{pool}, "test-mutex", 2)
orderCh := make(chan int)
for i,v :=range mutexes {
go func(i int,mutex *redsync.Mutex) {
if err := mutex.Lock(); err != nil {
t.Fatalf("Expected err == nil, got %q", err)
return
}
fmt.Println(i,"add lock ....")
conn := pool.Get()
DoRedisCmdByConn(pool,"SET",fmt.Sprintf("name%v",i),fmt.Sprintf("name%v",i))
str,_ := redis.String(DoRedisCmdByConn(pool,"GET",fmt.Sprintf("name%v",i))
fmt.Println(str)
DoRedisCmdByConn(pool,"DEL",fmt.Sprintf("name%v",i))
conn.Close()
mutex.Unlock()
fmt.Println(i,"del lock ....")
orderCh