## 准备工作
```
go get -u google.golang.org/grpc
go get -u github.com/golang/protobuf/protoc-gen-go
export PATH=$PATH:$GOPATH/bin
```
## 编辑pd/hello.proto
```
syntax = "proto3";
option objc_class_prefix = "HLW";
package hello;
// 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;
}
```
## server.go
```
package main
import (
"log"
"net"
pb "github.com/grpc-example/simple/pb"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
const (
PORT = ":50001"
)
type server struct{}
func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
log.Println("request: ", in.Name)
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()
grpc.EnableTracing = true
pb.RegisterGreeterServer(s, &server{})
log.Println("rpc服务已经开启")
s.Serve(lis)
}
```
## cli.go
```
package main
import (
"log"
"os"
pb "github.com/grpc-example/simple/pb"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
const (
address = "localhost:50001"
)
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 := "lin"
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.Println(r.Message)
}
```
## 编译.proto文件命令
```
protoc --go_out=plugins=grpc:. hello.proto
```
## 下载demo
```
git clone https://github.com/grpc-example/simple.git
cd simple
```
## run server
```
go run server.go
```
## run client
```
go run cli.go
```
## 项目地址
[https://github.com/grpc-example/simple](https://github.com/grpc-example/simple)
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