| // 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 grpcproxy |
| |
| import ( |
| "sync" |
| ) |
| |
| // watchRanges tracks all open watches for the proxy. |
| type watchRanges struct { |
| wp *watchProxy |
| |
| mu sync.Mutex |
| bcasts map[watchRange]*watchBroadcasts |
| } |
| |
| func newWatchRanges(wp *watchProxy) *watchRanges { |
| return &watchRanges{ |
| wp: wp, |
| bcasts: make(map[watchRange]*watchBroadcasts), |
| } |
| } |
| |
| func (wrs *watchRanges) add(w *watcher) { |
| wrs.mu.Lock() |
| defer wrs.mu.Unlock() |
| |
| if wbs := wrs.bcasts[w.wr]; wbs != nil { |
| wbs.add(w) |
| return |
| } |
| wbs := newWatchBroadcasts(wrs.wp) |
| wrs.bcasts[w.wr] = wbs |
| wbs.add(w) |
| } |
| |
| func (wrs *watchRanges) delete(w *watcher) { |
| wrs.mu.Lock() |
| defer wrs.mu.Unlock() |
| wbs, ok := wrs.bcasts[w.wr] |
| if !ok { |
| panic("deleting missing range") |
| } |
| if wbs.delete(w) == 0 { |
| wbs.stop() |
| delete(wrs.bcasts, w.wr) |
| } |
| } |
| |
| func (wrs *watchRanges) stop() { |
| wrs.mu.Lock() |
| defer wrs.mu.Unlock() |
| for _, wb := range wrs.bcasts { |
| wb.stop() |
| } |
| wrs.bcasts = nil |
| } |