grpc-go使用教程之helloworld

protobuf的安装

github上下载一个cpp包：https://github.com/google/protobuf/releases
make  make

google的grpc-go使用教程

github地址：​​https://github.com/grpc/grpc-go​​

使用之前请配置好go环境和gopath路劲

helloworld教程：

1、首先安装proto文件生成go文件的插件（Install the protoc Go plugin）

go get -u github.com/golang/protobuf/protoc-gen-go

helloworld.proto文件

syntax = "proto3";

//package helloworld;

// The greeting service definition.
service Greeter{
    // Sends a greeting
    rpc SayHello (HelloRequest) returns (HelloReply) {}
}

// The request message containing the user's name.
message HelloRequest {
    string name = 1;
}

// The response message containing the greetings
message HelloReply {
    string message = 1;
}

2、利用命令生成pb.go文件.

protoc -I . helloworld.proto --go_out=plugins=grpc:.

[root@localhost chenxun]# ll
total 12
-rw-r--r--. 1 root root 5111 Apr 20 09:28 helloworld.pb.go
-rw-r--r--. 1 root root  515 Apr 20 09:24 helloworld.proto
[root@localhost chenxun]# 

3 、server.go

package main
/*
 *
 * Copyright 2015 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.
 *
 */

//go:generate protoc -I ../helloworld --go_out=plugins=grpc:../helloworld ../helloworld/helloworld.proto

import (
  "log"
  "net"
  "golang.org/x/net/context"
  "google.golang.org/grpc"
  "google.golang.org/grpc/reflection"
  pb "google.golang.org/grpc/examples/helloworld/helloworld"

)

const (
  port = ":50051"
)

// server is used to implement helloworld.GreeterServer.
type server struct{}

// SayHello implements helloworld.GreeterServer
func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
  return &pb.HelloReply{Message: "Hello " + in.Name}, nil
}

func main() {
  lis, err := net.Listen("tcp", port)
  if err != nil {
    log.Fatalf("failed to listen: %v", err)
  }
  s := grpc.NewServer()
  pb.RegisterGreeterServer(s, &server{})
  // Register reflection service on gRPC server.
  reflection.Register(s)
  if err := s.Serve(lis); err != nil {
    log.Fatalf("failed to serve: %v", err)
  }
}

4.client.go

/*
 *
 * Copyright 2015 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.
 *
 */

package main


import (
  "log"
  "os"
  "time"

  "golang.org/x/net/context"
  "google.golang.org/grpc"
  pb "google.golang.org/grpc/examples/helloworld/helloworld"
)

const (
  address     = "192.168.200.8:50051"
  defaultName = "world"
)

func main() {
  // Set up a connection to the server.
  conn, err := grpc.Dial(address, grpc.WithInsecure())
  if err != nil {
    log.Fatalf("did not connect: %v", err)
  }
  defer conn.Close()
  c := pb.NewGreeterClient(conn)

  // Contact the server and print out its response.
  name := defaultName
  if len(os.Args) > 1 {
    name = os.Args[1]
  }
  ctx, cancel := context.WithTimeout(context.Background(), time.Second)
  defer cancel()
  r, err := c.SayHello(ctx, &pb.HelloRequest{Name: name})
  if err != nil {
    log.Fatalf("could not greet: %v", err)
  }
  log.Printf("Greeting: %s", r.Message)
}

5.执行

2018/04/20 10:31:12 Greeting: