etcd/contrib/recipes/watch.go
Piotr Tabor 28f2b07623 *: Update references to code moved to the api/ dir.
Follow up to file-moves done in the previous commit.

The commit contains purely mechanical consequences of execution (apart
of scripts/genproto.sh):

  % find ./ -name '*.go'  | xargs sed --follow-symlinks -i 's|v3/etcdserver/api/v3rpc/rpctypes|v3/api/v3rpc/rpctypes|g'
  % find ./ -name '*.go'  | xargs sed --follow-symlinks -i 's|v3/version|v3/api/version|g'
  % find ./ -name '*.go'  | xargs sed --follow-symlinks -i 's|v3/mvcc/mvccpb|v3/api/mvccpb|g'
  % find ./ -name '*.go'  | xargs sed --follow-symlinks -i 's|v3/etcdserver/etcdserverpb|v3/api/etcdserverpb|g'
  % find ./ -name '*.go'  | xargs sed --follow-symlinks -i 's|v3/etcdserver/api/membership/membershippb|v3/api/membershippb|g'
  % find ./ -name '*.go'  | xargs sed --follow-symlinks -i 's|v3/auth/authpb|v3/api/authpb|g'

  % find ./ -name '*.proto' -o -name '*.md'  | xargs -L 1 sed --follow-symlinks -i 's|/mvcc/mvccpb/kv.proto|/api/mvccpb/kv.proto|g'
  % find ./ -name '*.proto' -o -name '*.md'  | xargs -L 1 sed --follow-symlinks -i 's|/auth/authpb/auth.proto|/api/authpb/auth.proto|g'
  % find ./ -name '*.proto' -o -name '*.md'  | xargs -L 1 sed --follow-symlinks -i 's|/etcdserver/api/membership/membershippb/membership.proto|/api/membershippb/membership.proto|g'

  I also modified manually paths in scripts/genproto.sh.

  % go fmt ./...
2020-10-06 11:56:16 +02:00

59 lines
1.7 KiB
Go

// 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"
"go.etcd.io/etcd/api/v3/mvccpb"
"go.etcd.io/etcd/v3/clientv3"
)
// 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) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
wc := c.Watch(ctx, 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) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
wc := c.Watch(ctx, 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
}