mirror of https://github.com/grpc/grpc-go.git
107 lines
3.3 KiB
Go
107 lines
3.3 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 demonstrated gRPC's support for xDS APIs on the server-side. It
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// exposes the Greeter service that will response with the hostname.
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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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"math/rand"
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"net"
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"os"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials/insecure"
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xdscreds "google.golang.org/grpc/credentials/xds"
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pb "google.golang.org/grpc/examples/helloworld/helloworld"
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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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"google.golang.org/grpc/xds"
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)
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var (
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port = flag.Int("port", 50051, "the port to serve Greeter service requests on. Health service will be served on `port+1`")
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xdsCreds = flag.Bool("xds_creds", false, "whether the server should use xDS APIs to receive security configuration")
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)
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// server implements helloworld.GreeterServer interface.
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type server struct {
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pb.UnimplementedGreeterServer
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serverName string
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}
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// SayHello implements helloworld.GreeterServer interface.
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func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
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log.Printf("Received: %v", in.GetName())
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return &pb.HelloReply{Message: "Hello " + in.GetName() + ", from " + s.serverName}, nil
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}
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func determineHostname() string {
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hostname, err := os.Hostname()
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if err != nil {
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log.Printf("Failed to get hostname: %v, will generate one", err)
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rand.Seed(time.Now().UnixNano())
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return fmt.Sprintf("generated-%03d", rand.Int()%100)
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}
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return hostname
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}
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func main() {
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flag.Parse()
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greeterPort := fmt.Sprintf(":%d", *port)
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greeterLis, err := net.Listen("tcp4", greeterPort)
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if err != nil {
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log.Fatalf("net.Listen(tcp4, %q) failed: %v", greeterPort, err)
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}
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creds := insecure.NewCredentials()
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if *xdsCreds {
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log.Println("Using xDS credentials...")
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var err error
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if creds, err = xdscreds.NewServerCredentials(xdscreds.ServerOptions{FallbackCreds: insecure.NewCredentials()}); err != nil {
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log.Fatalf("failed to create server-side xDS credentials: %v", err)
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}
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}
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greeterServer := xds.NewGRPCServer(grpc.Creds(creds))
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pb.RegisterGreeterServer(greeterServer, &server{serverName: determineHostname()})
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healthPort := fmt.Sprintf(":%d", *port+1)
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healthLis, err := net.Listen("tcp4", healthPort)
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if err != nil {
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log.Fatalf("net.Listen(tcp4, %q) failed: %v", healthPort, err)
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}
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grpcServer := grpc.NewServer()
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healthServer := health.NewServer()
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healthServer.SetServingStatus("", healthpb.HealthCheckResponse_SERVING)
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healthgrpc.RegisterHealthServer(grpcServer, healthServer)
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log.Printf("Serving GreeterService on %s and HealthService on %s", greeterLis.Addr().String(), healthLis.Addr().String())
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go func() {
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greeterServer.Serve(greeterLis)
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}()
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grpcServer.Serve(healthLis)
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}
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