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watcher_inner.go
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/
watcher_inner.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 etcd
import (
"context"
"github.com/apache/servicecomb-service-center/pkg/gopool"
"github.com/apache/servicecomb-service-center/pkg/log"
"github.com/apache/servicecomb-service-center/server/plugin/registry"
"sync"
)
type innerWatcher struct {
Cfg ListWatchConfig
lw ListWatch
bus chan *registry.PluginResponse
stopCh chan struct{}
stop bool
mux sync.Mutex
}
func (w *innerWatcher) EventBus() <-chan *registry.PluginResponse {
return w.bus
}
func (w *innerWatcher) process(_ context.Context) {
stopCh := make(chan struct{})
ctx, cancel := context.WithTimeout(w.Cfg.Context, w.Cfg.Timeout)
gopool.Go(func(_ context.Context) {
defer close(stopCh)
w.lw.DoWatch(ctx, w.sendEvent)
})
select {
case <-stopCh:
// timed out or exception
w.Stop()
cancel()
case <-w.stopCh:
cancel()
}
}
func (w *innerWatcher) sendEvent(resp *registry.PluginResponse) {
defer log.Recover()
w.bus <- resp
}
func (w *innerWatcher) Stop() {
w.mux.Lock()
if w.stop {
w.mux.Unlock()
return
}
w.stop = true
close(w.stopCh)
close(w.bus)
w.mux.Unlock()
}
func newInnerWatcher(lw ListWatch, cfg ListWatchConfig) *innerWatcher {
w := &innerWatcher{
Cfg: cfg,
lw: lw,
bus: make(chan *registry.PluginResponse, eventBusSize),
stopCh: make(chan struct{}),
}
gopool.Go(w.process)
return w
}