mirror of
https://github.com/etcd-io/etcd.git
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51b4d6b7a8
We do not wait for the cancellation from actual etcd server, but generate it at the proxy side. The rule is to return the latest rev that the watcher has seen. This should be good enough for most use cases if not all.
108 lines
2.3 KiB
Go
108 lines
2.3 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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"github.com/coreos/etcd/clientv3"
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"golang.org/x/net/context"
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)
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type watchergroups struct {
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cw clientv3.Watcher
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mu sync.Mutex
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groups map[watchRange]*watcherGroup
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idToGroup map[receiverID]*watcherGroup
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proxyCtx context.Context
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}
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func (wgs *watchergroups) addWatcher(rid receiverID, w watcher) {
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wgs.mu.Lock()
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defer wgs.mu.Unlock()
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groups := wgs.groups
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if wg, ok := groups[w.wr]; ok {
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wg.add(rid, w)
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wgs.idToGroup[rid] = wg
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return
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}
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ctx, cancel := context.WithCancel(wgs.proxyCtx)
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wch := wgs.cw.Watch(ctx, w.wr.key,
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clientv3.WithRange(w.wr.end),
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clientv3.WithProgressNotify(),
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clientv3.WithCreatedNotify(),
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)
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watchg := newWatchergroup(wch, cancel)
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watchg.add(rid, w)
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go watchg.run()
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groups[w.wr] = watchg
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wgs.idToGroup[rid] = watchg
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}
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func (wgs *watchergroups) removeWatcher(rid receiverID) (int64, bool) {
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wgs.mu.Lock()
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defer wgs.mu.Unlock()
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if g, ok := wgs.idToGroup[rid]; ok {
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g.delete(rid)
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delete(wgs.idToGroup, rid)
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if g.isEmpty() {
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g.stop()
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}
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return g.revision(), true
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}
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return -1, false
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}
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func (wgs *watchergroups) maybeJoinWatcherSingle(rid receiverID, ws watcherSingle) bool {
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wgs.mu.Lock()
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defer wgs.mu.Unlock()
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group, ok := wgs.groups[ws.w.wr]
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if ok {
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if ws.w.rev >= group.rev {
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group.add(receiverID{streamID: ws.sws.id, watcherID: ws.w.id}, ws.w)
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return true
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}
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return false
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}
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if ws.canPromote() {
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wg := newWatchergroup(ws.ch, ws.cancel)
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wgs.groups[ws.w.wr] = wg
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wg.add(receiverID{streamID: ws.sws.id, watcherID: ws.w.id}, ws.w)
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go wg.run()
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return true
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}
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return false
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}
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func (wgs *watchergroups) stop() {
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wgs.mu.Lock()
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defer wgs.mu.Unlock()
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for _, wg := range wgs.groups {
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wg.stop()
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}
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wgs.groups = nil
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}
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