mirror of https://github.com/grpc/grpc-go.git
94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
/*
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*
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* Copyright 2019 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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pb "google.golang.org/grpc/examples/features/proto/echo"
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)
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var port = flag.Int("port", 50052, "port number")
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type failingServer struct {
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pb.UnimplementedEchoServer
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mu sync.Mutex
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reqCounter uint
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reqModulo uint
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}
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// this method will fail reqModulo - 1 times RPCs and return status code Unavailable,
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// and succeeded RPC on reqModulo times.
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func (s *failingServer) maybeFailRequest() error {
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s.mu.Lock()
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defer s.mu.Unlock()
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s.reqCounter++
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if (s.reqModulo > 0) && (s.reqCounter%s.reqModulo == 0) {
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return nil
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}
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return status.Errorf(codes.Unavailable, "maybeFailRequest: failing it")
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}
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func (s *failingServer) UnaryEcho(ctx context.Context, req *pb.EchoRequest) (*pb.EchoResponse, error) {
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if err := s.maybeFailRequest(); err != nil {
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log.Println("request failed count:", s.reqCounter)
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return nil, err
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}
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log.Println("request succeeded count:", s.reqCounter)
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return &pb.EchoResponse{Message: req.Message}, 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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fmt.Println("listen on address", address)
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s := grpc.NewServer()
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// Configure server to pass every fourth RPC;
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// client is configured to make four attempts.
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failingservice := &failingServer{
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reqCounter: 0,
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reqModulo: 4,
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}
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pb.RegisterEchoServer(s, failingservice)
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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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