Intercommunication with gRPC applications

Intercommunication with gRPC applications

1. Introduction

The triple protocol is 100% compatible with gRPC. This example demonstrates using dubbo-go to develop applications that interoperate with gRPC. You can view the complete example source code here.

2. How to Intercommunicate

The Triple protocol of Dubbo-go is compatible with the gRPC protocol. When creating the server, you can set protocol.WithTriple() to use the Triple protocol.

    srv, err := server.NewServer(
        server.WithServerProtocol(
        protocol.WithPort(20000),
        protocol.WithTriple(),
        ),
    )

3. Example

3.1 Server Introduction

Server proto File

Source file path: dubbo-go-sample/rpc/grpc/proto/greet.proto

syntax = "proto3";
package greet;
option go_package = "github.com/apache/dubbo-go-samples/rpc/grpc/proto;greet";
message GreetRequest {
  string name = 1;
}
message GreetResponse {
  string greeting = 1;
}
service GreetService {
  rpc Greet(GreetRequest) returns (GreetResponse) {}
}

dubbo-go Server

Source file path: dubbo-go-sample/rpc/grpc/go-server/cmd/main.go

type GreetTripleServer struct {
}
func (srv *GreetTripleServer) Greet(ctx context.Context, req *greet.GreetRequest) (*greet.GreetResponse, error) {
    resp := &greet.GreetResponse{Greeting: "dubbo:" + req.Name}
    return resp, nil
}
func main() {
    srv, err := server.NewServer(
        server.WithServerProtocol(
            protocol.WithPort(20000),
            protocol.WithTriple(),
        ),
    )
    if err != nil {
        panic(err)
    }
    if err := greet.RegisterGreetServiceHandler(srv, &GreetTripleServer{}); err != nil {
        panic(err)
    }
    if err := srv.Serve(); err != nil {
        logger.Error(err)
    }
}

gRPC Server

Source file path: dubbo-go-sample/rpc/grpc/grpc-server/cmd/main.go

type server struct {
    pb.UnimplementedGreetServiceServer
}
func (s *server) Greet(ctx context.Context, req *pb.GreetRequest) (*pb.GreetResponse, error) {
    resp := &pb.GreetResponse{Greeting: "grpc:" + req.Name}
    return resp, nil
}
func main() {
    lis, err := net.Listen("tcp", "127.0.0.1:20001")
    if err != nil {
        logger.Fatalf("failed to listen: %v", err)
    }
    s := grpc.NewServer()
    pb.RegisterGreetServiceServer(s, &server{})
    logger.Infof("server listening at %v", lis.Addr())
    if err := s.Serve(lis); err != nil {
        logger.Fatalf("failed to serve: %v", err)
    }
}

3.2 Client Introduction

dubbo-go Client

Source file path: dubbo-go-sample/rpc/grpc/go-client/cmd/main.go

package main
import (
    "context"
    "dubbo.apache.org/dubbo-go/v3/client"
    _ "dubbo.apache.org/dubbo-go/v3/imports"
    greet "github.com/apache/dubbo-go-samples/rpc/grpc/proto"
    "github.com/dubbogo/gost/log/logger"
)
func main() {
    // test connect with dubbo
    dubboCli, err := client.NewClient(
        client.WithClientURL("127.0.0.1:20000"),
    )
    if err != nil {
        panic(err)
    }
    svc, err := greet.NewGreetService(dubboCli)
    if err != nil {
        panic(err)
    }
    resp, err := svc.Greet(context.Background(), &greet.GreetRequest{Name: "hello world"})
    if err != nil {
        logger.Error(err)
    }
    logger.Infof("Greet response: %s", resp.Greeting)
    // test connect with grpc
    grpcCli, err := client.NewClient(
        client.WithClientURL("127.0.0.1:20001"),
    )
    if err != nil {
        panic(err)
    }
    svc, err = greet.NewGreetService(grpcCli)
    if err != nil {
        panic(err)
    }
    resp, err = svc.Greet(context.Background(), &greet.GreetRequest{Name: "hello world"})
    if err != nil {
        logger.Error(err)
    }
    logger.Infof("Greet response: %s", resp.Greeting)
}

gRPC Client

Source file path: dubbo-go-sample/rpc/grpc/grpc-client/cmd/main.go

package main
import (
    "context"
    "time"
    "github.com/dubbogo/gost/log/logger"
    pb "github.com/apache/dubbo-go-samples/rpc/grpc/proto"
    "google.golang.org/grpc"
    "google.golang.org/grpc/credentials/insecure"
)
func main() {
    // test connect with grpc
    grpcConn, err := grpc.Dial("127.0.0.1:20001", grpc.WithTransportCredentials(insecure.NewCredentials()))
    if err != nil {
        logger.Fatalf("did not connect: %v", err)
    }
    defer grpcConn.Close()
    c := pb.NewGreetServiceClient(grpcConn)
    ctx, cancel := context.WithTimeout(context.Background(), time.Second)
    defer cancel()
    resp, err := c.Greet(ctx, &pb.GreetRequest{Name: "hello world"})
    if err != nil {
        logger.Fatalf("could not greet: %v", err)
    }
    logger.Infof("Greet response: %s", resp.Greeting)
    // test connect with dubbo
    dubboConn, err := grpc.Dial("127.0.0.1:20000", grpc.WithTransportCredentials(insecure.NewCredentials()))
    if err != nil {
        logger.Fatalf("did not connect: %v", err)
    }
    defer dubboConn.Close()
    c = pb.NewGreetServiceClient(dubboConn)
    ctx, cancel = context.WithTimeout(context.Background(), time.Second)
    defer cancel()
    resp, err = c.Greet(ctx, &pb.GreetRequest{Name: "hello world"})
    if err != nil {
        logger.Fatalf("could not greet: %v", err)
    }
    logger.Infof("Greet response: %s", resp.Greeting)
}

3.3 Example Results

Start the dubbo-go server and gRPC server first, then start the dubbo-go client and gRPC client, and observe the console output.

Dubbo-go client output:

Greet response: dubbo:hello world
Greet response: grpc:hello world

gRPC client output:

Greet response: grpc:hello world
Greet response: dubbo:hello world

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Last modified September 30, 2024: Update & Translate Overview Docs (#3040) (d37ebceaea7)