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main.go
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main.go
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package main
import (
"context"
"flag"
"fmt"
"log"
"net"
"net/http"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
pb "github.com/lixd/grpc-go-example/features/proto/gateway"
"google.golang.org/grpc"
)
var port = flag.Int("port", 50051, "the port to serve on")
var restful = flag.Int("restful", 8080, "the port to restful serve on")
type server struct {
pb.UnimplementedGreeterServer
}
func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
return &pb.HelloReply{Message: "hello " + in.Name}, nil
}
func main() {
// Create a gRPC server object
s := grpc.NewServer()
// Attach the Greeter service to the server
pb.RegisterGreeterServer(s, &server{})
// Serve gRPC Server
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
log.Println("Serving gRPC on 0.0.0.0" + fmt.Sprintf(":%d", *port))
go func() {
if err := s.Serve(lis); err != nil {
log.Fatalf("failed to serve: %v", err)
}
}()
// 2. 启动 HTTP 服务
// Create a client connection to the gRPC server we just started
// This is where the gRPC-Gateway proxies the requests
conn, err := grpc.Dial(
"localhost:50051",
grpc.WithInsecure(),
)
if err != nil {
log.Fatalln("Failed to dial server:", err)
}
gwmux := runtime.NewServeMux()
// Register Greeter
err = pb.RegisterGreeterHandler(context.Background(), gwmux, conn)
if err != nil {
log.Fatalln("Failed to register gateway:", err)
}
gwServer := &http.Server{
Addr: fmt.Sprintf(":%d", *restful),
Handler: gwmux,
}
log.Println("Serving gRPC-Gateway on http://0.0.0.0" + fmt.Sprintf(":%d", *restful))
log.Fatalln(gwServer.ListenAndServe())
}