mirror of https://github.com/grpc/grpc-go.git
86 lines
2.1 KiB
Go
86 lines
2.1 KiB
Go
/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Binary server is an example server.
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package main
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import (
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"context"
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"flag"
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"fmt"
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"log"
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"net"
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"sync"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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epb "google.golang.org/genproto/googleapis/rpc/errdetails"
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pb "google.golang.org/grpc/examples/helloworld/helloworld"
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)
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var port = flag.Int("port", 50052, "port number")
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// server is used to implement helloworld.GreeterServer.
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type server struct {
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pb.UnimplementedGreeterServer
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mu sync.Mutex
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count map[string]int
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}
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// SayHello implements helloworld.GreeterServer
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func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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// Track the number of times the user has been greeted.
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s.count[in.Name]++
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if s.count[in.Name] > 1 {
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st := status.New(codes.ResourceExhausted, "Request limit exceeded.")
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ds, err := st.WithDetails(
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&epb.QuotaFailure{
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Violations: []*epb.QuotaFailure_Violation{{
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Subject: fmt.Sprintf("name:%s", in.Name),
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Description: "Limit one greeting per person",
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}},
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},
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)
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if err != nil {
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return nil, st.Err()
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}
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return nil, ds.Err()
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}
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return &pb.HelloReply{Message: "Hello " + in.Name}, nil
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}
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func main() {
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flag.Parse()
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address := fmt.Sprintf(":%v", *port)
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lis, err := net.Listen("tcp", address)
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if err != nil {
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log.Fatalf("failed to listen: %v", err)
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}
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s := grpc.NewServer()
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pb.RegisterGreeterServer(s, &server{count: make(map[string]int)})
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if err := s.Serve(lis); err != nil {
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log.Fatalf("failed to serve: %v", err)
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}
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}
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