[tldr] go使用gRPC
gRPC是谷歌推出的一个rpc服务框架, 数据编码采用protobuf实现.安装环境
go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest缺少可能导致出现可执行程序没有找到的报错, 可以参考stackoverflow的帖子
文件
syntax = "proto3";
option go_package = "./myproto";
package myproto;
message Hello {
string name = 1;
}
service HelloService {
rpc SayHello (Hello) returns (Hello);
}分别需要message和service2个部分的内容
编译
./bin/bin/protoc --go_out=. ./myproto/hello.proto
./bin/bin/protoc --go-grpc_out=. ./myproto/hello.proto使用上述指令编译为符合grpc使用的服务, 一个是message的定义的GO实现, 一个是service的定义的GO实现
根据grpc官方文档应该采用类似以下的指令实现, 效果是一样的
protoc --go_out=. --go_opt=paths=source_relative \
--go-grpc_out=. --go-grpc_opt=paths=source_relative \
./myproto/hello.proto
[*]本质是编译message和编译rpc的service
使用
以下代码为生成出来的go的grpc的服务的代码
// HelloServiceClient is the client API for HelloService service.
//
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
type HelloServiceClient interface {
SayHello(ctx context.Context, in *Hello, opts ...grpc.CallOption) (*Hello, error)
}
type helloServiceClient struct {
cc grpc.ClientConnInterface
}
func NewHelloServiceClient(cc grpc.ClientConnInterface) HelloServiceClient {
return &helloServiceClient{cc}
}
func (c *helloServiceClient) SayHello(ctx context.Context, in *Hello, opts ...grpc.CallOption) (*Hello, error) {
cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
out := new(Hello)
err := c.cc.Invoke(ctx, HelloService_SayHello_FullMethodName, in, out, cOpts...)
if err != nil {
return nil, err
}
return out, nil
}这些是自动生成的文件内容
Server
// HelloServiceServer is the server API for HelloService service.
// All implementations must embed UnimplementedHelloServiceServer
// for forward compatibility.
type HelloServiceServer interface {
SayHello(context.Context, *Hello) (*Hello, error)
mustEmbedUnimplementedHelloServiceServer()
}以上代码是编译器自动生成的GO代码
Client
// HelloServiceClient is the client API for HelloService service.
//
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
type HelloServiceClient interface {
SayHello(ctx context.Context, in *Hello, opts ...grpc.CallOption) (*Hello, error)
}以上为自动编译生成的代码
启动服务
在自己编写的代码中使用上述生成的代码
可以参考go-grpc官方仓库样例代码
server
package main
import (
"context"
"fmt"
"log"
"myrpc/myproto"
"net"
"google.golang.org/grpc"
)
const (
PORT = 1234
)
type Server struct {
myproto.UnimplementedHelloServiceServer
}
func (s *Server) SayHello(ctx context.Context, in *myproto.Req) (*myproto.Res, error) {
log.Printf("Received: %v", in.Name)
return &myproto.Res{Message: "Hello " + in.Name}, nil
}
func main() {
list, err := net.Listen("tcp", fmt.Sprintf(":%d", PORT))
if err != nil {
log.Printf("failed to listen: %v", err)
}
log.Printf("server listening at :%d", PORT)
grpcServer := grpc.NewServer()
myproto.RegisterHelloServiceServer(grpcServer, &Server{})
grpcServer.Serve(list)
}整体实现和常见的rpc类似
client
package main
import (
"context"
"fmt"
"myrpc/myproto"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
)
const (
PORT = 1234
)
func main() {
conn, err := grpc.NewClient(fmt.Sprintf(":%d", PORT), grpc.WithTransportCredentials(insecure.NewCredentials()))
if err != nil {
panic(err)
}
defer conn.Close()
c := myproto.NewHelloServiceClient(conn)
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
res, err := c.SayHello(ctx, &myproto.Req{Name: "xuhe"})
if err != nil {
panic(err)
}
fmt.Println(res.GetMessage())
}FQ
常见报错
panic: grpc: no transport security set (use grpc.WithTransportCredentials(insecure.NewCredentials()) explicitly or set credentials)
goroutine 1 :
main.main()
/home/xuhe/tmp/go/rpc/cmd/client/main.go:18 +0x1d4
exit status 2需要手动设置为conn, err := grpc.NewClient(fmt.Sprintf(":%d", PORT), grpc.WithTransportCredentials(insecure.NewCredentials()))不安全的实现方式
参考
grpc使用GO官方文档
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