mirror of https://github.com/grpc/grpc-go.git
90 lines
2.2 KiB
Go
90 lines
2.2 KiB
Go
/*
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*
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* Copyright 2020 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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"time"
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"google.golang.org/grpc"
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pb "google.golang.org/grpc/examples/features/proto/echo"
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"google.golang.org/grpc/health"
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healthgrpc "google.golang.org/grpc/health/grpc_health_v1"
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healthpb "google.golang.org/grpc/health/grpc_health_v1"
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)
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var (
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port = flag.Int("port", 50051, "the port to serve on")
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sleep = flag.Duration("sleep", time.Second*5, "duration between changes in health")
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system = "" // empty string represents the health of the system
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)
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type echoServer struct {
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pb.UnimplementedEchoServer
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}
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func (e *echoServer) UnaryEcho(ctx context.Context, req *pb.EchoRequest) (*pb.EchoResponse, error) {
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return &pb.EchoResponse{
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Message: fmt.Sprintf("hello from localhost:%d", *port),
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}, nil
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}
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var _ pb.EchoServer = &echoServer{}
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func main() {
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flag.Parse()
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lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
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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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healthcheck := health.NewServer()
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healthgrpc.RegisterHealthServer(s, healthcheck)
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pb.RegisterEchoServer(s, &echoServer{})
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go func() {
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// asynchronously inspect dependencies and toggle serving status as needed
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next := healthpb.HealthCheckResponse_SERVING
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for {
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healthcheck.SetServingStatus(system, next)
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if next == healthpb.HealthCheckResponse_SERVING {
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next = healthpb.HealthCheckResponse_NOT_SERVING
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} else {
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next = healthpb.HealthCheckResponse_SERVING
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}
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time.Sleep(*sleep)
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}
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}()
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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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