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/*
*
* Copyright 2020 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 demonstrated gRPC's support for xDS APIs on the server-side. It
// exposes the Greeter service that will response with the hostname.
package main
import (
"context"
"flag"
"fmt"
"log"
"math/rand"
"net"
"os"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
xdscreds "google.golang.org/grpc/credentials/xds"
pb "google.golang.org/grpc/examples/helloworld/helloworld"
"google.golang.org/grpc/health"
healthgrpc "google.golang.org/grpc/health/grpc_health_v1"
healthpb "google.golang.org/grpc/health/grpc_health_v1"
"google.golang.org/grpc/xds"
)
var (
port = flag.Int("port", 50051, "the port to serve Greeter service requests on. Health service will be served on `port+1`")
xdsCreds = flag.Bool("xds_creds", false, "whether the server should use xDS APIs to receive security configuration")
)
// server implements helloworld.GreeterServer interface.
type server struct {
pb.UnimplementedGreeterServer
serverName string
}
// SayHello implements helloworld.GreeterServer interface.
func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
log.Printf("Received: %v", in.GetName())
return &pb.HelloReply{Message: "Hello " + in.GetName() + ", from " + s.serverName}, nil
}
func determineHostname() string {
hostname, err := os.Hostname()
if err != nil {
log.Printf("Failed to get hostname: %v, will generate one", err)
rand.Seed(time.Now().UnixNano())
return fmt.Sprintf("generated-%03d", rand.Int()%100)
}
return hostname
}
func main() {
flag.Parse()
greeterPort := fmt.Sprintf(":%d", *port)
greeterLis, err := net.Listen("tcp4", greeterPort)
if err != nil {
log.Fatalf("net.Listen(tcp4, %q) failed: %v", greeterPort, err)
}
creds := insecure.NewCredentials()
if *xdsCreds {
log.Println("Using xDS credentials...")
var err error
if creds, err = xdscreds.NewServerCredentials(xdscreds.ServerOptions{FallbackCreds: insecure.NewCredentials()}); err != nil {
log.Fatalf("failed to create server-side xDS credentials: %v", err)
}
}
greeterServer, err := xds.NewGRPCServer(grpc.Creds(creds))
if err != nil {
log.Fatalf("Failed to create an xDS enabled gRPC server: %v", err)
}
pb.RegisterGreeterServer(greeterServer, &server{serverName: determineHostname()})
healthPort := fmt.Sprintf(":%d", *port+1)
healthLis, err := net.Listen("tcp4", healthPort)
if err != nil {
log.Fatalf("net.Listen(tcp4, %q) failed: %v", healthPort, err)
}
grpcServer := grpc.NewServer()
healthServer := health.NewServer()
healthServer.SetServingStatus("", healthpb.HealthCheckResponse_SERVING)
healthgrpc.RegisterHealthServer(grpcServer, healthServer)
log.Printf("Serving GreeterService on %s and HealthService on %s", greeterLis.Addr().String(), healthLis.Addr().String())
go func() {
greeterServer.Serve(greeterLis)
}()
grpcServer.Serve(healthLis)
}
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