golang gRPC安装

2017-11-19

安装gRPC runtime

1	go get google.golang.org/grpc

如果不能翻墙，可以通过golang 中国下载，將安装包解压到GOPATH/src目录下，然后执行go install google.golang.org/grpc安装

安装protobuf buffer

下载protobuf安装包，解压后，编译

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2
3

./configure
make 
sudo make install

执行protoc --version验证有没有安装成功
如果报找不到动态链接库的错误，在/etc/ld.so.conf.d/目录下新建一个protoc.conf文件，將动态库的目录添加进去，再执行sudo ldconfig

安装proto插件和库

1 2	go get -u github.com/golang/protobuf/proto go get -u github.com/golang/protobuf/protoc-gen-go

安装完之后，需要將GOBIN添加进PATH路径

1 2	echo "export PATH = $PATH:$GOBIN" >> ~/.bashrc source ~/.bashrc

示例程序

协议文件

创建一个文件夹用来存放协议文件，protocol/helloworld.proto

syntax = "proto3";

option objc_class_prefix = "HLW";

package protocol;

// 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;
}

使用protoc命令生成go文件

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

服务器程序

server.go

package main

import (
	"log"
	"net"
	pb "protocol"

	"golang.org/x/net/context"
	"google.golang.org/grpc"
)

const (
	port = ":5001"
)

type server struct{}

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{})
	s.Serve(lis)
}

客户端程序

client.go

package main

import (
	"log"
	"os"

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

const (
	address     = "localhost:5001"
	defaultName = "world"
)

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

	name := defaultName
	if len(os.Args) > 1 {
		name = os.Args[1]
	}
	r, err := c.SayHello(context.Background(), &pb.HelloRequest{Name: name})
	if err != nil {
		log.Fatalf("could not greet: %v", err)
	}
	log.Printf("Greeting: %s", r.Message)
}

先运行服务器，再运行客户端

1 2	go run server.go & go run client.go

可以看到rpc调用成功