mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
// Copyright 2016 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 recipe
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import (
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"context"
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"go.etcd.io/etcd/clientv3"
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"go.etcd.io/etcd/mvcc/mvccpb"
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)
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// WaitEvents waits on a key until it observes the given events and returns the final one.
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func WaitEvents(c *clientv3.Client, key string, rev int64, evs []mvccpb.Event_EventType) (*clientv3.Event, error) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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wc := c.Watch(ctx, key, clientv3.WithRev(rev))
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if wc == nil {
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return nil, ErrNoWatcher
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}
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return waitEvents(wc, evs), nil
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}
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func WaitPrefixEvents(c *clientv3.Client, prefix string, rev int64, evs []mvccpb.Event_EventType) (*clientv3.Event, error) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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wc := c.Watch(ctx, prefix, clientv3.WithPrefix(), clientv3.WithRev(rev))
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if wc == nil {
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return nil, ErrNoWatcher
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}
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return waitEvents(wc, evs), nil
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}
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func waitEvents(wc clientv3.WatchChan, evs []mvccpb.Event_EventType) *clientv3.Event {
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i := 0
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for wresp := range wc {
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for _, ev := range wresp.Events {
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if ev.Type == evs[i] {
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i++
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if i == len(evs) {
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return ev
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}
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}
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}
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}
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return nil
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}
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