mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
66 lines
1.8 KiB
Go
66 lines
1.8 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 concurrency
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import (
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"context"
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"fmt"
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v3 "github.com/coreos/etcd/clientv3"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"github.com/coreos/etcd/mvcc/mvccpb"
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)
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func waitDelete(ctx context.Context, client *v3.Client, key string, rev int64) error {
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cctx, cancel := context.WithCancel(ctx)
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defer cancel()
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var wr v3.WatchResponse
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wch := client.Watch(cctx, key, v3.WithRev(rev))
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for wr = range wch {
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for _, ev := range wr.Events {
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if ev.Type == mvccpb.DELETE {
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return nil
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}
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}
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}
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if err := wr.Err(); err != nil {
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return err
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}
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if err := ctx.Err(); err != nil {
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return err
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}
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return fmt.Errorf("lost watcher waiting for delete")
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}
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// waitDeletes efficiently waits until all keys matching the prefix and no greater
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// than the create revision.
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func waitDeletes(ctx context.Context, client *v3.Client, pfx string, maxCreateRev int64) (*pb.ResponseHeader, error) {
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getOpts := append(v3.WithLastCreate(), v3.WithMaxCreateRev(maxCreateRev))
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for {
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resp, err := client.Get(ctx, pfx, getOpts...)
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if err != nil {
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return nil, err
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}
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if len(resp.Kvs) == 0 {
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return resp.Header, nil
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}
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lastKey := string(resp.Kvs[0].Key)
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if err = waitDelete(ctx, client, lastKey, resp.Header.Revision); err != nil {
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return nil, err
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}
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}
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}
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