mirror of https://github.com/grpc/grpc-go.git
88 lines
2.0 KiB
Go
88 lines
2.0 KiB
Go
/*
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*
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* Copyright 2020 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 is an example client.
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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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"fmt"
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"log"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials/insecure"
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pb "google.golang.org/grpc/examples/features/proto/echo"
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_ "google.golang.org/grpc/health"
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"google.golang.org/grpc/resolver"
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"google.golang.org/grpc/resolver/manual"
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)
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var serviceConfig = `{
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"loadBalancingPolicy": "round_robin",
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"healthCheckConfig": {
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"serviceName": ""
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}
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}`
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func callUnaryEcho(c pb.EchoClient) {
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ctx, cancel := context.WithTimeout(context.Background(), time.Second)
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defer cancel()
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r, err := c.UnaryEcho(ctx, &pb.EchoRequest{})
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if err != nil {
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fmt.Println("UnaryEcho: _, ", err)
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} else {
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fmt.Println("UnaryEcho: ", r.GetMessage())
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}
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}
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func main() {
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flag.Parse()
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r := manual.NewBuilderWithScheme("whatever")
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r.InitialState(resolver.State{
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Addresses: []resolver.Address{
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{Addr: "localhost:50051"},
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{Addr: "localhost:50052"},
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},
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})
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address := fmt.Sprintf("%s:///unused", r.Scheme())
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options := []grpc.DialOption{
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithBlock(),
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grpc.WithResolvers(r),
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grpc.WithDefaultServiceConfig(serviceConfig),
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}
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conn, err := grpc.NewClient(address, options...)
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if err != nil {
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log.Fatalf("grpc.NewClient(%q): %v", address, err)
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}
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defer conn.Close()
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echoClient := pb.NewEchoClient(conn)
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for {
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callUnaryEcho(echoClient)
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time.Sleep(time.Second)
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}
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}
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