50 lines
1.6 KiB
Go
50 lines
1.6 KiB
Go
// Copyright 2017 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ordering
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import (
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"errors"
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"sync"
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"time"
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"github.com/coreos/etcd/clientv3"
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)
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type OrderViolationFunc func(op clientv3.Op, resp clientv3.OpResponse, prevRev int64) error
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var ErrNoGreaterRev = errors.New("etcdclient: no cluster members have a revision higher than the previously received revision")
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func NewOrderViolationSwitchEndpointClosure(c clientv3.Client) OrderViolationFunc {
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var mu sync.Mutex
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violationCount := 0
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return func(op clientv3.Op, resp clientv3.OpResponse, prevRev int64) error {
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if violationCount > len(c.Endpoints()) {
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return ErrNoGreaterRev
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}
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mu.Lock()
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defer mu.Unlock()
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eps := c.Endpoints()
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// force client to connect to given endpoint by limiting to a single endpoint
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c.SetEndpoints(eps[violationCount%len(eps)])
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// give enough time for operation
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time.Sleep(1 * time.Second)
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// set available endpoints back to all endpoints in to ensure
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// the client has access to all the endpoints.
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c.SetEndpoints(eps...)
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violationCount++
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return nil
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}
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}
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