| // 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 client |
| |
| import ( |
| "context" |
| "encoding/json" |
| "fmt" |
| "log" |
| |
| pb "github.com/apache/servicecomb-service-center/pkg/registry" |
| scerr "github.com/apache/servicecomb-service-center/server/scerror" |
| "github.com/gorilla/websocket" |
| ) |
| |
| const ( |
| apiWatcherURL = "/v4/%s/registry/microservices/%s/watcher" |
| ) |
| |
| func (c *Client) Watch(ctx context.Context, domain, project, selfServiceID string, callback func(*pb.WatchInstanceResponse)) *scerr.Error { |
| headers := c.CommonHeaders(ctx) |
| headers.Set("X-Domain-Name", domain) |
| |
| conn, err := c.WebsocketDial(ctx, fmt.Sprintf(apiWatcherURL, project, selfServiceID), headers) |
| if err != nil { |
| return scerr.NewError(scerr.ErrInternal, err.Error()) |
| } |
| |
| for { |
| messageType, message, err := conn.ReadMessage() |
| if err != nil { |
| log.Println(err) |
| break |
| } |
| if messageType == websocket.TextMessage { |
| data := &pb.WatchInstanceResponse{} |
| err := json.Unmarshal(message, data) |
| if err != nil { |
| log.Println(err) |
| break |
| } |
| callback(data) |
| } |
| } |
| return scerr.NewError(scerr.ErrInternal, err.Error()) |
| } |