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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"
"log"
"net"
"sync"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
epb "google.golang.org/genproto/googleapis/rpc/errdetails"
pb "google.golang.org/grpc/examples/helloworld/helloworld"
)
var port = flag.Int("port", 50052, "port number")
// server is used to implement helloworld.GreeterServer.
type server struct {
pb.UnimplementedGreeterServer
mu sync.Mutex
count map[string]int
}
// SayHello implements helloworld.GreeterServer
func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
s.mu.Lock()
defer s.mu.Unlock()
// Track the number of times the user has been greeted.
s.count[in.Name]++
if s.count[in.Name] > 1 {
st := status.New(codes.ResourceExhausted, "Request limit exceeded.")
ds, err := st.WithDetails(
&epb.QuotaFailure{
Violations: []*epb.QuotaFailure_Violation{{
Subject: fmt.Sprintf("name:%s", in.Name),
Description: "Limit one greeting per person",
}},
},
)
if err != nil {
return nil, st.Err()
}
return nil, ds.Err()
}
return &pb.HelloReply{Message: "Hello " + in.Name}, nil
}
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)
}
s := grpc.NewServer()
pb.RegisterGreeterServer(s, &server{count: make(map[string]int)})
if err := s.Serve(lis); err != nil {
log.Fatalf("failed to serve: %v", err)
}
}
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