71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
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package dao
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import (
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"context"
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"math/rand"
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"time"
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"go-common/library/cache/redis"
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"go-common/library/log"
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)
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func randomString(l int) string {
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str := "0123456789abcdefghijklmnopqrstuvwxyz"
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bytes := []byte(str)
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result := []byte{}
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r := rand.New(rand.NewSource(time.Now().UnixNano()))
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for i := 0; i < l; i++ {
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result = append(result, bytes[r.Intn(len(bytes))])
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}
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return string(result)
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}
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// Lock .
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func (d *Dao) Lock(ctx context.Context, realKey string, ttl int, retry int, retryDelay int) (gotLock bool, lockValue string, err error) {
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if retry <= 0 {
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retry = 1
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}
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lockValue = "locked:" + randomString(5)
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retryTimes := 0
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conn := d.redis.Get(ctx)
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defer conn.Close()
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for ; retryTimes < retry; retryTimes++ {
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var res interface{}
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res, err = conn.Do("SET", realKey, lockValue, "PX", ttl, "NX")
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if err != nil {
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log.Error("redis_lock failed:%s:%s", realKey, err.Error())
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break
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}
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if res != nil {
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gotLock = true
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break
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}
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time.Sleep(time.Duration(retryDelay * 1000))
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}
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return
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}
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// UnLock .
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func (d *Dao) UnLock(ctx context.Context, realKey string, lockValue string) (err error) {
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conn := d.redis.Get(ctx)
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defer conn.Close()
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res, err := redis.String(conn.Do("GET", realKey))
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if err != nil {
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log.Error("redis_unlock get error:%s:%v", realKey, err)
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return
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}
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if res != lockValue {
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err = ErrUnLockGet
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return
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}
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_, err = conn.Do("DEL", realKey)
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if err != nil {
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log.Error("redis_unlock del error:%s:%v", realKey, err)
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}
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return
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}
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