| /* |
| * 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" |
| |
| "github.com/apache/servicecomb-service-center/pkg/goutil" |
| "github.com/apache/servicecomb-service-center/pkg/log" |
| "github.com/apache/servicecomb-service-center/pkg/util" |
| "github.com/apache/servicecomb-service-center/server/event" |
| "github.com/apache/servicecomb-service-center/server/metrics" |
| "github.com/go-chassis/foundation/gopool" |
| "github.com/gorilla/websocket" |
| ) |
| |
| func Watch(ctx context.Context, serviceID string, conn *websocket.Conn) { |
| domainProject := util.ParseDomainProject(ctx) |
| domain := util.ParseDomain(ctx) |
| |
| ws := NewWebSocket(domainProject, serviceID, conn) |
| HealthChecker().Accept(ws) |
| |
| subscriber := event.NewInstanceSubscriber(serviceID, domainProject) |
| err := event.Center().AddSubscriber(subscriber) |
| if err != nil { |
| SendEstablishError(conn, err) |
| return |
| } |
| |
| metrics.ReportSubscriber(domain, Websocket, 1) |
| defer metrics.ReportSubscriber(domain, Websocket, -1) |
| |
| pool := goutil.New(gopool.Configure().WithContext(ctx).Workers(1)).Do(func(ctx context.Context) { |
| if err := NewBroker(ws, subscriber).Listen(ctx); err != nil { |
| log.Error(fmt.Sprintf("[%s] listen service[%s] failed", conn.RemoteAddr(), serviceID), err) |
| } |
| }) |
| defer pool.Done() |
| |
| if err := ws.ReadMessage(); err != nil { |
| log.Error(fmt.Sprintf("read subscriber[%s][%s] message failed", serviceID, conn.RemoteAddr()), err) |
| subscriber.SetError(err) |
| } |
| } |
| |
| func SendEstablishError(conn *websocket.Conn, err error) { |
| remoteAddr := conn.RemoteAddr().String() |
| log.Error(fmt.Sprintf("establish[%s] websocket watch failed.", remoteAddr), err) |
| if err := conn.WriteMessage(websocket.TextMessage, util.StringToBytesWithNoCopy(err.Error())); err != nil { |
| log.Error(fmt.Sprintf("establish[%s] websocket watch failed: write message failed.", remoteAddr), err) |
| } |
| } |