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locker.go
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locker.go
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// Copyright 2018 MOBIKE, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package etcd
import (
"sync"
"github.com/coreos/etcd/clientv3/concurrency"
"github.com/fuguohong1024/moha/pkg/log"
"github.com/juju/errors"
)
// NewDistributedLockGenerator creates DistributedLockGenerator
func NewDistributedLockGenerator(client *Client, lockPrefix string, lockTTL int) DistributedLockGenerator {
return DistributedLockGenerator{
client: client,
lockPrefix: client.KeyWithRootPath(lockPrefix),
lockTTL: lockTTL,
}
}
// DistributedLockGenerator implements LockGenerator interface
type DistributedLockGenerator struct {
client *Client
lockPrefix string
lockTTL int
}
// NewLocker creates a new distributed locker
func (g *DistributedLockGenerator) NewLocker() (sync.Locker, error) {
session, err := concurrency.NewSession(g.client.client, concurrency.WithTTL(g.lockTTL))
if err != nil {
log.Error("has error when NewSession ", err)
return nil, errors.Trace(err)
}
return concurrency.NewLocker(session, g.lockPrefix), nil
}