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ec459c2185
The single watcher / group watcher distinction limited and complicated watcher coalescing more than necessary. Reworked: Each server watcher is represented by a WatchBroadcast, each client "Watcher" attaches to some WatchBroadcast. WatchBroadcasts hold all WatchBroadcast instances for a range. WatchRanges holds all WatchBroadcasts for the proxy. WatchProxyStreams represent a grpc watch stream between the proxy and a client. When a client requests a new watcher through its grpc stream, the ProxyStream will allocate a Watcher and WatchRanges assigns it to some WatchBroadcast based on its range. Coalescing is done by WatchBroadcasts when it receives an update notification from a WatchBroadcast. Supports leader failure detection so watches on a bad member can migrate to other members. Coincidentally, Fixes #6303.
71 lines
1.5 KiB
Go
71 lines
1.5 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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)
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// watchRanges tracks all open watches for the proxy.
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type watchRanges struct {
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wp *watchProxy
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mu sync.Mutex
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bcasts map[watchRange]*watchBroadcasts
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}
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func newWatchRanges(wp *watchProxy) *watchRanges {
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return &watchRanges{
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wp: wp,
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bcasts: make(map[watchRange]*watchBroadcasts),
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}
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}
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func (wrs *watchRanges) add(w *watcher) {
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wrs.mu.Lock()
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defer wrs.mu.Unlock()
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if wbs := wrs.bcasts[w.wr]; wbs != nil {
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wbs.add(w)
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return
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}
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wbs := newWatchBroadcasts(wrs.wp)
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wrs.bcasts[w.wr] = wbs
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wbs.add(w)
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}
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func (wrs *watchRanges) delete(w *watcher) {
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wrs.mu.Lock()
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defer wrs.mu.Unlock()
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wbs, ok := wrs.bcasts[w.wr]
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if !ok {
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panic("deleting missing range")
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}
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wbs.delete(w)
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if wbs.empty() {
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wbs.stop()
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delete(wrs.bcasts, w.wr)
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}
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}
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func (wrs *watchRanges) stop() {
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wrs.mu.Lock()
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defer wrs.mu.Unlock()
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for _, wb := range wrs.bcasts {
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wb.stop()
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}
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wrs.bcasts = nil
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}
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