blob: e4cf7751740114b33e178fccb4c0168afee9bdb6 [file] [log] [blame]
// 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 concurrency
import (
"context"
"fmt"
v3 "go.etcd.io/etcd/clientv3"
pb "go.etcd.io/etcd/etcdserver/etcdserverpb"
"go.etcd.io/etcd/mvcc/mvccpb"
)
func waitDelete(ctx context.Context, client *v3.Client, key string, rev int64) error {
cctx, cancel := context.WithCancel(ctx)
defer cancel()
var wr v3.WatchResponse
wch := client.Watch(cctx, key, v3.WithRev(rev))
for wr = range wch {
for _, ev := range wr.Events {
if ev.Type == mvccpb.DELETE {
return nil
}
}
}
if err := wr.Err(); err != nil {
return err
}
if err := ctx.Err(); err != nil {
return err
}
return fmt.Errorf("lost watcher waiting for delete")
}
// waitDeletes efficiently waits until all keys matching the prefix and no greater
// than the create revision.
func waitDeletes(ctx context.Context, client *v3.Client, pfx string, maxCreateRev int64) (*pb.ResponseHeader, error) {
getOpts := append(v3.WithLastCreate(), v3.WithMaxCreateRev(maxCreateRev))
for {
resp, err := client.Get(ctx, pfx, getOpts...)
if err != nil {
return nil, err
}
if len(resp.Kvs) == 0 {
return resp.Header, nil
}
lastKey := string(resp.Kvs[0].Key)
if err = waitDelete(ctx, client, lastKey, resp.Header.Revision); err != nil {
return nil, err
}
}
}