| /* |
| * 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 ws |
| |
| import ( |
| "context" |
| "fmt" |
| "sync" |
| "time" |
| |
| "github.com/apache/servicecomb-service-center/pkg/gopool" |
| "github.com/apache/servicecomb-service-center/pkg/log" |
| ) |
| |
| var checker *HealthCheck |
| |
| func init() { |
| checker = NewHealthCheck() |
| checker.Run() |
| } |
| |
| type HealthCheck struct { |
| wss []*WebSocket |
| lock sync.Mutex |
| goroutine *gopool.Pool |
| } |
| |
| func (wh *HealthCheck) Run() { |
| gopool.Go(checker.loop) |
| } |
| |
| func (wh *HealthCheck) Stop() { |
| wh.goroutine.Close(true) |
| } |
| |
| func (wh *HealthCheck) loop(ctx context.Context) { |
| defer wh.Stop() |
| ticker := time.NewTicker(500 * time.Millisecond) |
| for { |
| select { |
| case <-ctx.Done(): |
| // server shutdown |
| return |
| case <-ticker.C: |
| for _, ws := range wh.wss { |
| if t := ws.NeedCheck(); t == nil { |
| continue |
| } |
| wh.check(ws) |
| } |
| } |
| } |
| } |
| |
| func (wh *HealthCheck) check(ws *WebSocket) { |
| wh.goroutine.Do(func(ctx context.Context) { |
| if err := ws.CheckHealth(ctx); err != nil { |
| wh.Remove(ws) |
| log.Error(fmt.Sprintf("checker removed unhealth websocket[%s]", ws.RemoteAddr), err) |
| } |
| }) |
| } |
| |
| func (wh *HealthCheck) Accept(ws *WebSocket) int { |
| wh.lock.Lock() |
| wh.wss = append(wh.wss, ws) |
| n := len(wh.wss) |
| wh.lock.Unlock() |
| return n |
| } |
| |
| func (wh *HealthCheck) Remove(ws *WebSocket) int { |
| wh.lock.Lock() |
| for i, t := range wh.wss { |
| if t == ws { |
| wh.wss = append(wh.wss[0:i], wh.wss[i+1:]...) |
| break |
| } |
| } |
| n := len(wh.wss) |
| wh.lock.Unlock() |
| return n |
| } |
| |
| func NewHealthCheck() *HealthCheck { |
| return &HealthCheck{ |
| goroutine: gopool.New(context.Background()), |
| } |
| } |
| |
| func HealthChecker() *HealthCheck { |
| return checker |
| } |