| /* |
| * |
| * 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 client is an example client. |
| package main |
| |
| import ( |
| "context" |
| "log" |
| "net" |
| "os" |
| "time" |
| |
| "google.golang.org/grpc" |
| "google.golang.org/grpc/channelz/service" |
| "google.golang.org/grpc/resolver" |
| "google.golang.org/grpc/resolver/manual" |
| |
| pb "google.golang.org/grpc/examples/helloworld/helloworld" |
| ) |
| |
| const ( |
| defaultName = "world" |
| ) |
| |
| func main() { |
| /***** Set up the server serving channelz service. *****/ |
| lis, err := net.Listen("tcp", ":50052") |
| 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() |
| |
| /***** Initialize manual resolver and Dial *****/ |
| r := manual.NewBuilderWithScheme("whatever") |
| // Set up a connection to the server. |
| conn, err := grpc.Dial(r.Scheme()+":///test.server", grpc.WithInsecure(), grpc.WithResolvers(r), grpc.WithBalancerName("round_robin")) |
| if err != nil { |
| log.Fatalf("did not connect: %v", err) |
| } |
| defer conn.Close() |
| // Manually provide resolved addresses for the target. |
| r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: ":10001"}, {Addr: ":10002"}, {Addr: ":10003"}}}) |
| |
| c := pb.NewGreeterClient(conn) |
| |
| // Contact the server and print out its response. |
| name := defaultName |
| if len(os.Args) > 1 { |
| name = os.Args[1] |
| } |
| |
| /***** Make 100 SayHello RPCs *****/ |
| for i := 0; i < 100; i++ { |
| // Setting a 150ms timeout on the RPC. |
| ctx, cancel := context.WithTimeout(context.Background(), 150*time.Millisecond) |
| defer cancel() |
| r, err := c.SayHello(ctx, &pb.HelloRequest{Name: name}) |
| if err != nil { |
| log.Printf("could not greet: %v", err) |
| } else { |
| log.Printf("Greeting: %s", r.Message) |
| } |
| } |
| |
| /***** Wait for user exiting the program *****/ |
| // Unless you exit the program (e.g. CTRL+C), channelz data will be available for querying. |
| // Users can take time to examine and learn about the info provided by channelz. |
| select {} |
| } |