mirror of https://github.com/grpc/grpc-go.git
94 lines
2.7 KiB
Go
94 lines
2.7 KiB
Go
/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Binary client demonstrates how to use logging and Channelz for debugging
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// gRPC operations.
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package main
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import (
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"context"
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"flag"
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"log"
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"net"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/channelz/service"
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"google.golang.org/grpc/credentials/insecure"
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"google.golang.org/grpc/resolver"
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"google.golang.org/grpc/resolver/manual"
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pb "google.golang.org/grpc/examples/helloworld/helloworld"
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)
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const (
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defaultName = "world"
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)
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var (
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addr = flag.String("addr", "localhost:50051", "the address to connect to")
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name = flag.String("name", defaultName, "Name to greet")
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)
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func main() {
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flag.Parse()
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/***** Set up the server serving channelz service. *****/
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lis, err := net.Listen("tcp", *addr)
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if err != nil {
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log.Fatalf("failed to listen: %v", err)
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}
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defer lis.Close()
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s := grpc.NewServer()
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service.RegisterChannelzServiceToServer(s)
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go s.Serve(lis)
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defer s.Stop()
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/***** Initialize manual resolver and Dial *****/
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r := manual.NewBuilderWithScheme("whatever")
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r.InitialState(resolver.State{Addresses: []resolver.Address{{Addr: ":10001"}, {Addr: ":10002"}, {Addr: ":10003"}}})
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// Set up a connection to the server.
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conn, err := grpc.NewClient(r.Scheme()+":///test.server", grpc.WithTransportCredentials(insecure.NewCredentials()), grpc.WithResolvers(r), grpc.WithDefaultServiceConfig(`{"loadBalancingPolicy":"round_robin"}`))
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if err != nil {
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log.Fatalf("did not connect: %v", err)
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}
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defer conn.Close()
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// Manually provide resolved addresses for the target.
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c := pb.NewGreeterClient(conn)
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// Contact the server and print out its response.
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/***** Make 100 SayHello RPCs *****/
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for i := 0; i < 100; i++ {
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// Setting a 150ms timeout on the RPC.
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ctx, cancel := context.WithTimeout(context.Background(), 150*time.Millisecond)
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defer cancel()
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r, err := c.SayHello(ctx, &pb.HelloRequest{Name: *name})
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if err != nil {
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log.Printf("could not greet: %v", err)
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} else {
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log.Printf("Greeting: %s", r.Message)
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}
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}
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/***** Wait for user exiting the program *****/
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// Unless you exit the program (e.g. CTRL+C), channelz data will be available for querying.
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// Users can take time to examine and learn about the info provided by channelz.
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select {}
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}
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