| /* |
| * |
| * Copyright 2018 gRPC authors. |
| * |
| * Licensed 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. |
| * |
| */ |
| |
| // Binary server is an example server. |
| package main |
| |
| import ( |
| "context" |
| "log" |
| "net" |
| "time" |
| |
| "google.golang.org/grpc" |
| "google.golang.org/grpc/channelz/service" |
| "google.golang.org/grpc/internal/grpcrand" |
| |
| pb "google.golang.org/grpc/examples/helloworld/helloworld" |
| ) |
| |
| var ( |
| ports = []string{":10001", ":10002", ":10003"} |
| ) |
| |
| // sayHello implements helloworld.GreeterServer.SayHello |
| func sayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) { |
| return &pb.HelloReply{Message: "Hello " + in.Name}, nil |
| } |
| |
| // sayHelloSlow implements helloworld.GreeterServer.SayHello |
| func sayHelloSlow(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) { |
| // Delay 100ms ~ 200ms before replying |
| time.Sleep(time.Duration(100+grpcrand.Intn(100)) * time.Millisecond) |
| return &pb.HelloReply{Message: "Hello " + in.Name}, nil |
| } |
| |
| func main() { |
| /***** Set up the server serving channelz service. *****/ |
| lis, err := net.Listen("tcp", ":50051") |
| if err != nil { |
| log.Fatalf("failed to listen: %v", err) |
| } |
| defer lis.Close() |
| s := grpc.NewServer() |
| service.RegisterChannelzServiceToServer(s) |
| go s.Serve(lis) |
| defer s.Stop() |
| |
| /***** Start three GreeterServers(with one of them to be the slow server). *****/ |
| for i := 0; i < 3; i++ { |
| lis, err := net.Listen("tcp", ports[i]) |
| if err != nil { |
| log.Fatalf("failed to listen: %v", err) |
| } |
| defer lis.Close() |
| s := grpc.NewServer() |
| if i == 2 { |
| pb.RegisterGreeterService(s, &pb.GreeterService{SayHello: sayHelloSlow}) |
| } else { |
| pb.RegisterGreeterService(s, &pb.GreeterService{SayHello: sayHello}) |
| } |
| go s.Serve(lis) |
| } |
| |
| /***** Wait for user exiting the program *****/ |
| select {} |
| } |