103 lines
2.2 KiB
Go
103 lines
2.2 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 grpcproxy
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import (
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"sync"
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"golang.org/x/net/context"
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"github.com/coreos/etcd/clientv3"
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)
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type watcherGroup struct {
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// ch delievers events received from the etcd server
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ch clientv3.WatchChan
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// cancel is used to cancel the underlying etcd server watcher
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// It should also close the ch.
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cancel context.CancelFunc
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mu sync.Mutex
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rev int64 // current revision of the watchergroup
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receivers map[receiverID]watcher
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donec chan struct{}
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}
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type receiverID struct {
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streamID, watcherID int64
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}
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func newWatchergroup(wch clientv3.WatchChan, c context.CancelFunc) *watcherGroup {
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return &watcherGroup{
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ch: wch,
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cancel: c,
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receivers: make(map[receiverID]watcher),
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donec: make(chan struct{}),
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}
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}
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func (wg *watcherGroup) run() {
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defer close(wg.donec)
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for wr := range wg.ch {
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wg.broadcast(wr)
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}
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}
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func (wg *watcherGroup) broadcast(wr clientv3.WatchResponse) {
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wg.mu.Lock()
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defer wg.mu.Unlock()
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wg.rev = wr.Header.Revision
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for _, r := range wg.receivers {
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r.send(wr)
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}
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}
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// add adds the watcher into the group with given ID.
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// The current revision of the watcherGroup is returned.
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func (wg *watcherGroup) add(rid receiverID, w watcher) int64 {
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wg.mu.Lock()
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defer wg.mu.Unlock()
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wg.receivers[rid] = w
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return wg.rev
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}
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func (wg *watcherGroup) delete(rid receiverID) {
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wg.mu.Lock()
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defer wg.mu.Unlock()
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delete(wg.receivers, rid)
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}
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func (wg *watcherGroup) isEmpty() bool {
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wg.mu.Lock()
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defer wg.mu.Unlock()
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return len(wg.receivers) == 0
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}
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func (wg *watcherGroup) stop() {
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wg.cancel()
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<-wg.donec
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}
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func (wg *watcherGroup) revision() int64 {
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wg.mu.Lock()
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defer wg.mu.Unlock()
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return wg.rev
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}
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