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lock.go
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lock.go
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package frame
import (
"math/rand"
"os"
"strconv"
"sync"
"time"
)
//加锁解锁服务,利用这个可以做一些高并发场景需求
//用法:
// 先加锁,加锁成功运行后续业务(业务结束后解锁,不可再次执行的操作可以不解锁等待自动解锁),加锁失败重试加锁流程(具体重试由业务方自己控制)
type Lock struct {
GroupName string
redis *Redis
redisOnce sync.Once
KeyPrefix string
LockTime int
}
func (lock *Lock) getRedis() *Redis {
if lock.redis == nil {
lock.redisOnce.Do(func() {
lock.redis = &Redis{GroupName: lock.GroupName}
})
}
return lock.redis
}
//加单据锁
// orderId 单据ID
// lockTime 锁过期时间(秒)
func (lock *Lock) AddLock(orderId string, lockTime ...int) (string, bool) {
if orderId == "" {
return "", false
}
lockTimeRange := lock.LockTime
if len(lockTime) > 0 {
if lockTime[0] > 0 {
lockTimeRange = lockTime[0]
}
}
//生成唯一锁ID,解锁需持有此ID
intUniqueLockId := lock.generateUniqueLockId()
//根据模板,结合单据ID,生成唯一Redis key(一般来说,单据ID在业务中系统中唯一的)
strKey := lock.KeyPrefix + orderId
//加锁
res := lock.getRedis().SetNx(strKey, intUniqueLockId, lockTimeRange)
if res {
return intUniqueLockId, true
}
return "", false
}
//解单据锁
// orderId 单据ID
// lockId 锁唯一ID
// return bool
func (lock *Lock) ReleaseLock(orderId string, lockId string) bool {
if orderId == "" || lockId == "" {
return false
}
//根据模板,结合单据ID,生成唯一Redis key(一般来说,单据ID在业务中系统中唯一的)
strKey := lock.KeyPrefix + orderId
return lock.getRedis().WatchDelete(strKey, lockId)
}
func (lock *Lock) generateUniqueLockId() string {
rand.Seed(time.Now().UnixNano())
str := strconv.Itoa(int(time.Now().Unix())) + strconv.Itoa(os.Getpid()) + strconv.Itoa(rand.Intn(1000))
return Md5(str)
}