| /* |
| * 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 grpc |
| |
| import ( |
| "context" |
| "net" |
| |
| "github.com/apache/servicecomb-service-center/pkg/gopool" |
| "github.com/apache/servicecomb-service-center/pkg/log" |
| pb "github.com/apache/servicecomb-service-center/syncer/proto" |
| "google.golang.org/grpc" |
| ) |
| |
| type GRPCHandler interface { |
| Discovery() *pb.SyncData |
| } |
| type PullHandle func() *pb.SyncData |
| |
| // Server struct |
| type Server struct { |
| lsn net.Listener |
| addr string |
| handler GRPCHandler |
| readyCh chan struct{} |
| errorCh chan error |
| } |
| |
| // NewServer new grpc server |
| func NewServer(addr string, handler GRPCHandler) *Server { |
| return &Server{ |
| addr: addr, |
| handler: handler, |
| readyCh: make(chan struct{}), |
| errorCh: make(chan error), |
| } |
| } |
| |
| // Provide consumers with an interface to pull data |
| func (s *Server) Pull(ctx context.Context, in *pb.PullRequest) (*pb.SyncData, error) { |
| return s.handler.Discovery(), nil |
| } |
| |
| // Stop grpc server |
| func (s *Server) Stop() { |
| if s.lsn != nil { |
| s.lsn.Close() |
| s.lsn = nil |
| } |
| } |
| |
| // Start grpc server |
| func (s *Server) Start(ctx context.Context) { |
| lsn, err := net.Listen("tcp", s.addr) |
| if err == nil { |
| svc := grpc.NewServer() |
| pb.RegisterSyncServer(svc, s) |
| s.lsn = lsn |
| gopool.Go(func(ctx context.Context) { |
| err = svc.Serve(s.lsn) |
| }) |
| } |
| |
| if err != nil { |
| log.Error("start grpc failed", err) |
| s.errorCh <- err |
| return |
| } |
| log.Info("start grpc success") |
| close(s.readyCh) |
| } |
| |
| // Ready Returns a channel that will be closed when grpc is ready |
| func (s *Server) Ready() <-chan struct{} { |
| return s.readyCh |
| } |
| |
| // Error Returns a channel that will be transmit a grpc error |
| func (s *Server) Error() <-chan error { |
| return s.errorCh |
| } |