| /* |
| * 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 notify |
| |
| import ( |
| "errors" |
| "github.com/apache/servicecomb-service-center/pkg/log" |
| "github.com/apache/servicecomb-service-center/pkg/util" |
| apt "github.com/apache/servicecomb-service-center/server/core" |
| pb "github.com/apache/servicecomb-service-center/server/core/proto" |
| "golang.org/x/net/context" |
| "time" |
| ) |
| |
| func HandleWatchJob(watcher *InstanceEventListWatcher, stream pb.ServiceInstanceCtrl_WatchServer) (err error) { |
| timer := time.NewTimer(HeartbeatInterval) |
| defer timer.Stop() |
| for { |
| select { |
| case <-stream.Context().Done(): |
| return |
| case <-timer.C: |
| timer.Reset(HeartbeatInterval) |
| |
| // TODO grpc 长连接心跳? |
| case job := <-watcher.Job: |
| if job == nil { |
| err = errors.New("channel is closed") |
| log.Errorf(err, "watcher caught an exception, subject: %s, group: %s", |
| watcher.Subject(), watcher.Group()) |
| return |
| } |
| resp := job.Response |
| log.Infof("event is coming in, watcher, subject: %s, group: %s", |
| watcher.Subject(), watcher.Group()) |
| |
| err = stream.Send(resp) |
| if job != nil { |
| ReportPublishCompleted(job, err) |
| } |
| if err != nil { |
| log.Errorf(err, "send message error, subject: %s, group: %s", |
| watcher.Subject(), watcher.Group()) |
| watcher.SetError(err) |
| return |
| } |
| |
| util.ResetTimer(timer, HeartbeatInterval) |
| } |
| } |
| } |
| |
| func DoStreamListAndWatch(ctx context.Context, serviceId string, f func() ([]*pb.WatchInstanceResponse, int64), stream pb.ServiceInstanceCtrl_WatchServer) (err error) { |
| domainProject := util.ParseDomainProject(ctx) |
| domain := util.ParseDomain(ctx) |
| watcher := NewInstanceEventListWatcher(serviceId, apt.GetInstanceRootKey(domainProject)+"/", f) |
| err = NotifyCenter().AddSubscriber(watcher) |
| if err != nil { |
| return |
| } |
| ReportSubscriber(domain, GRPC, 1) |
| err = HandleWatchJob(watcher, stream) |
| ReportSubscriber(domain, GRPC, -1) |
| return |
| } |