v3

type EtcdLock struct {
	Client *clientv3.Client
	Key    string
	Index  uint64
}

type EtcdLocker struct {
	Client *clientv3.Client
}

type Lock interface {
	Release() error
}

type Locker interface {
	Acquire(key string, ttl int64) (Lock, error)
	WaitAcquire(key string, ttl uint64) (Lock, error)
}