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/*
*
* Copyright 2018 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
// Binary server is an example server.
package main
import (
"context"
"flag"
"fmt"
"io"
"log"
"net"
"strings"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
pb "google.golang.org/grpc/examples/features/proto/echo"
)
var port = flag.Int("port", 50052, "port number")
// server is used to implement EchoServer.
type server struct {
pb.UnimplementedEchoServer
client pb.EchoClient
cc *grpc.ClientConn
}
func (s *server) UnaryEcho(ctx context.Context, req *pb.EchoRequest) (*pb.EchoResponse, error) {
message := req.Message
if strings.HasPrefix(message, "[propagate me]") {
time.Sleep(800 * time.Millisecond)
message = strings.TrimPrefix(message, "[propagate me]")
return s.client.UnaryEcho(ctx, &pb.EchoRequest{Message: message})
}
if message == "delay" {
time.Sleep(1500 * time.Millisecond)
}
return &pb.EchoResponse{Message: req.Message}, nil
}
func (s *server) BidirectionalStreamingEcho(stream pb.Echo_BidirectionalStreamingEchoServer) error {
for {
req, err := stream.Recv()
if err == io.EOF {
return status.Error(codes.InvalidArgument, "request message not received")
}
if err != nil {
return err
}
message := req.Message
if strings.HasPrefix(message, "[propagate me]") {
time.Sleep(800 * time.Millisecond)
message = strings.TrimPrefix(message, "[propagate me]")
res, err := s.client.UnaryEcho(stream.Context(), &pb.EchoRequest{Message: message})
if err != nil {
return err
}
stream.Send(res)
}
if message == "delay" {
time.Sleep(1500 * time.Millisecond)
}
stream.Send(&pb.EchoResponse{Message: message})
}
}
func (s *server) Close() {
s.cc.Close()
}
func newEchoServer() *server {
target := fmt.Sprintf("localhost:%v", *port)
cc, err := grpc.Dial(target, grpc.WithInsecure())
if err != nil {
log.Fatalf("did not connect: %v", err)
}
return &server{client: pb.NewEchoClient(cc), cc: cc}
}
func main() {
flag.Parse()
address := fmt.Sprintf(":%v", *port)
lis, err := net.Listen("tcp", address)
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
echoServer := newEchoServer()
defer echoServer.Close()
grpcServer := grpc.NewServer()
pb.RegisterEchoServer(grpcServer, echoServer)
if err := grpcServer.Serve(lis); err != nil {
log.Fatalf("failed to serve: %v", err)
}
}
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