GRPC安装

1. 在环境变量配置你的go_path/bin

2. 下载protoc，解压缩到go_path/bin

3. 运行命令

   go get google.golang.org/protobuf/cmd/protoc-gen-go 
   go get google.golang.org/grpc/cmd/protoc-gen-go-grpc
   

4. 写个helloworld.pb文件

   // 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.
   
   syntax = "proto3";
   
   option go_package = "google.golang.org/grpc/examples/helloworld/helloworld";
   option java_multiple_files = true;
   option java_package = "io.grpc.examples.helloworld";
   option java_outer_classname = "HelloWorldProto";
   
   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;
   }
   

5. 编译（注意windows为一行，并且去掉下划线）

   protoc --go_out=. --go_opt=paths=source_relative \
       --go-grpc_out=. --go-grpc_opt=paths=source_relative \
       helloworld/helloworld.proto
   

参考官方文档

https://grpc.io/docs/languages/go/quickstart/