khenaidoo | ffe076b | 2019-01-15 16:08:08 -0500 | [diff] [blame^] | 1 | // Copyright 2016 The etcd Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package grpcproxy |
| 16 | |
| 17 | import ( |
| 18 | "sync" |
| 19 | ) |
| 20 | |
| 21 | // watchRanges tracks all open watches for the proxy. |
| 22 | type watchRanges struct { |
| 23 | wp *watchProxy |
| 24 | |
| 25 | mu sync.Mutex |
| 26 | bcasts map[watchRange]*watchBroadcasts |
| 27 | } |
| 28 | |
| 29 | func newWatchRanges(wp *watchProxy) *watchRanges { |
| 30 | return &watchRanges{ |
| 31 | wp: wp, |
| 32 | bcasts: make(map[watchRange]*watchBroadcasts), |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | func (wrs *watchRanges) add(w *watcher) { |
| 37 | wrs.mu.Lock() |
| 38 | defer wrs.mu.Unlock() |
| 39 | |
| 40 | if wbs := wrs.bcasts[w.wr]; wbs != nil { |
| 41 | wbs.add(w) |
| 42 | return |
| 43 | } |
| 44 | wbs := newWatchBroadcasts(wrs.wp) |
| 45 | wrs.bcasts[w.wr] = wbs |
| 46 | wbs.add(w) |
| 47 | } |
| 48 | |
| 49 | func (wrs *watchRanges) delete(w *watcher) { |
| 50 | wrs.mu.Lock() |
| 51 | defer wrs.mu.Unlock() |
| 52 | wbs, ok := wrs.bcasts[w.wr] |
| 53 | if !ok { |
| 54 | panic("deleting missing range") |
| 55 | } |
| 56 | if wbs.delete(w) == 0 { |
| 57 | wbs.stop() |
| 58 | delete(wrs.bcasts, w.wr) |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | func (wrs *watchRanges) stop() { |
| 63 | wrs.mu.Lock() |
| 64 | defer wrs.mu.Unlock() |
| 65 | for _, wb := range wrs.bcasts { |
| 66 | wb.stop() |
| 67 | } |
| 68 | wrs.bcasts = nil |
| 69 | } |