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lease.go
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lease.go
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package lock_ridis
import (
"context"
"sync/atomic"
"time"
"github.com/songzhibin97/gkit/distributed/locker"
"github.com/songzhibin97/gkit/log"
"github.com/songzhibin97/gkit/options"
"github.com/songzhibin97/gkit/tools/rand_string"
)
// leaseConfig
type leaseConfig struct {
// 是否开启续约,默认开启
enable bool
// interval: 续约时间间隔
// 只有 retries > 0 才有效
// interval < 0 的话 retries 同样无效
interval time.Duration
// randomNum 生成随机数的位数
randomNum int
// logger 内部错误输出
logger log.Logger
}
func SetLeaseEnable(enable bool) options.Option {
return func(c interface{}) {
c.(*leaseConfig).enable = enable
}
}
func SetLeaseInterval(duration time.Duration) options.Option {
return func(c interface{}) {
c.(*leaseConfig).interval = duration
}
}
func SetLeaseRandomNum(randomNum int) options.Option {
return func(c interface{}) {
c.(*leaseConfig).randomNum = randomNum
}
}
func SetLeaseLogger(logger log.Logger) options.Option {
return func(c interface{}) {
c.(*leaseConfig).logger = logger
}
}
func LeaseLock(lock locker.Locker, key string, expire int, ops ...options.Option) (func() error, error) {
c := leaseConfig{
enable: true,
interval: time.Duration(expire/1000) * time.Second / 3,
logger: log.DefaultLogger,
randomNum: 6,
}
for _, op := range ops {
op(&c)
}
if c.interval <= 0 {
c.enable = false
}
mark := rand_string.RandomLetter(c.randomNum)
err := lock.Lock(key, expire, mark)
if err != nil {
return nil, err
}
var cls atomic.Bool
ctx, cancel := context.WithCancel(context.Background())
if c.enable {
go func() {
click := time.NewTicker(c.interval)
defer click.Stop()
for {
select {
case <-ctx.Done():
cancel()
return
case <-click.C:
if cls.Load() {
return
}
// 续约
err = lock.Lock(key, expire, mark)
if err != nil && c.logger != nil {
_ = c.logger.Log(log.LevelError, "key", key, "err", err)
}
}
}
}()
}
return func() error {
if cls.Load() {
return nil
}
cls.Store(true)
defer cancel()
return lock.UnLock(key, mark)
}, nil
}