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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"
"log"
"net"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/channelz/service"
"google.golang.org/grpc/internal/grpcrand"
pb "google.golang.org/grpc/examples/helloworld/helloworld"
)
var (
ports = []string{":10001", ":10002", ":10003"}
)
// server is used to implement helloworld.GreeterServer.
type server struct {
pb.UnimplementedGreeterServer
}
// SayHello implements helloworld.GreeterServer
func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
return &pb.HelloReply{Message: "Hello " + in.Name}, nil
}
// slow server is used to simulate a server that has a variable delay in its response.
type slowServer struct {
pb.UnimplementedGreeterServer
}
// SayHello implements helloworld.GreeterServer
func (s *slowServer) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
// Delay 100ms ~ 200ms before replying
time.Sleep(time.Duration(100+grpcrand.Intn(100)) * time.Millisecond)
return &pb.HelloReply{Message: "Hello " + in.Name}, nil
}
func main() {
/***** Set up the server serving channelz service. *****/
lis, err := net.Listen("tcp", ":50051")
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
defer lis.Close()
s := grpc.NewServer()
service.RegisterChannelzServiceToServer(s)
go s.Serve(lis)
defer s.Stop()
/***** Start three GreeterServers(with one of them to be the slowServer). *****/
for i := 0; i < 3; i++ {
lis, err := net.Listen("tcp", ports[i])
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
defer lis.Close()
s := grpc.NewServer()
if i == 2 {
pb.RegisterGreeterServer(s, &slowServer{})
} else {
pb.RegisterGreeterServer(s, &server{})
}
go s.Serve(lis)
}
/***** Wait for user exiting the program *****/
select {}
}
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