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watch.go
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watch.go
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// Copyright 2016 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 recipe
import (
"context"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/mvcc/mvccpb"
)
// WaitEvents waits on a key until it observes the given events and returns the final one.
func WaitEvents(c *clientv3.Client, key string, rev int64, evs []mvccpb.Event_EventType) (*clientv3.Event, error) {
wc := c.Watch(context.Background(), key, clientv3.WithRev(rev))
if wc == nil {
return nil, ErrNoWatcher
}
return waitEvents(wc, evs), nil
}
func WaitPrefixEvents(c *clientv3.Client, prefix string, rev int64, evs []mvccpb.Event_EventType) (*clientv3.Event, error) {
wc := c.Watch(context.Background(), prefix, clientv3.WithPrefix(), clientv3.WithRev(rev))
if wc == nil {
return nil, ErrNoWatcher
}
return waitEvents(wc, evs), nil
}
func waitEvents(wc clientv3.WatchChan, evs []mvccpb.Event_EventType) *clientv3.Event {
i := 0
for wresp := range wc {
for _, ev := range wresp.Events {
if ev.Type == evs[i] {
i++
if i == len(evs) {
return ev
}
}
}
}
return nil
}