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main.go
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main.go
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package main
import (
"context"
"log"
"net"
"net/http"
"os"
"os/signal"
"sync"
"syscall"
pb "github.com/soslanco/go-protoc/examples/helloworld/helloworld"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
)
type hwserver struct {
pb.UnimplementedHWServer
}
func (hw *hwserver) HelloWorld(ctx context.Context, req *pb.HelloWorldRequest) (*pb.HelloWorldResponse, error) {
message := "Hello " + req.Name + "!"
log.Println(message)
return &pb.HelloWorldResponse{Message: message}, nil
}
func (hw *hwserver) HelloWorldPrefix(ctx context.Context, req *pb.HelloWorldPrefixRequest) (*pb.HelloWorldPrefixResponse, error) {
message := req.Prefix.Prefix + " " + req.Name + "!"
log.Println(message)
return &pb.HelloWorldPrefixResponse{Message: message}, nil
}
func main() {
var wg sync.WaitGroup
// Start GRPC server
l, err := net.Listen("tcp", ":50051")
if err != nil {
log.Fatal(err)
}
grpcSrv := grpc.NewServer()
pb.RegisterHWServer(grpcSrv, &hwserver{})
wg.Add(1)
go func() {
defer wg.Done()
if err := grpcSrv.Serve(l); err != nil {
log.Print(err)
}
}()
// Start HTTP reverse-proxy server
ctx, cancel := context.WithCancel(context.Background())
//defer cancel()
mux := runtime.NewServeMux()
opts := []grpc.DialOption{grpc.WithTransportCredentials(insecure.NewCredentials())}
err = pb.RegisterHWHandlerFromEndpoint(ctx, mux, "localhost:50051", opts)
if err != nil {
log.Fatal(err)
}
httpSrv := &http.Server{Addr: ":8080", Handler: mux}
wg.Add(1)
go func() {
defer wg.Done()
if err := httpSrv.ListenAndServe(); err != nil {
log.Print(err)
}
}()
// Wait for OS signal
sig := make(chan os.Signal, 1)
signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
go func() {
log.Print("wait for OS signal")
<-sig
log.Print("signal received")
log.Print("Stopping HTTP reverse-proxy server (GRPC)...")
cancel()
log.Print("Stopped HTTP reverse-proxy server (GRPC)")
log.Print("Stopping HTTP reverse-proxy server (HTTP)...")
httpSrv.Close()
log.Print("Stopped HTTP reverse-proxy server (HTTP)")
log.Print("Stopping GRPC server...")
grpcSrv.Stop()
log.Print("Stopped GRPC server")
}()
wg.Wait()
}