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util.go
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util.go
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// Copyright 2017 The etcd 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 ordering
import (
"errors"
"sync"
"time"
"github.com/coreos/etcd/clientv3"
)
type OrderViolationFunc func(op clientv3.Op, resp clientv3.OpResponse, prevRev int64) error
var ErrNoGreaterRev = errors.New("etcdclient: no cluster members have a revision higher than the previously received revision")
func NewOrderViolationSwitchEndpointClosure(c clientv3.Client) OrderViolationFunc {
var mu sync.Mutex
violationCount := 0
return func(op clientv3.Op, resp clientv3.OpResponse, prevRev int64) error {
if violationCount > len(c.Endpoints()) {
return ErrNoGreaterRev
}
mu.Lock()
defer mu.Unlock()
eps := c.Endpoints()
// force client to connect to given endpoint by limiting to a single endpoint
c.SetEndpoints(eps[violationCount%len(eps)])
// give enough time for operation
time.Sleep(1 * time.Second)
// set available endpoints back to all endpoints in to ensure
// the client has access to all the endpoints.
c.SetEndpoints(eps...)
violationCount++
return nil
}
}