watch_ranges.go

Documentation: go.etcd.io/etcd/server/v3/proxy/grpcproxy

     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  }
    70
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