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lock.go
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lock.go
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/*
*
* Copyright 2020 waterdrop authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package etcd
import (
"context"
"time"
"go.etcd.io/etcd/client/v3/concurrency"
)
// mutex distributed lock based on etcd
type mutex struct {
s *concurrency.Session
m *concurrency.Mutex
}
// NewMutex new lock
func (er *EtcdRegistry) NewMutex(key string, opts ...concurrency.SessionOption) (m *mutex, err error) {
m = &mutex{}
// default session ttl 60s
m.s, err = concurrency.NewSession(er.client, opts...)
if err != nil {
return
}
m.m = concurrency.NewMutex(m.s, key)
return
}
// Lock do lock op
func (m *mutex) Lock(ctx context.Context, timeout time.Duration) (err error) {
ctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
return m.m.Lock(ctx)
}
// Unlock release locked resource
func (m *mutex) Unlock(ctx context.Context) (err error) {
err = m.m.Unlock(ctx)
if err != nil {
return
}
return m.s.Close()
}