first

internal/grpc/server.go

@@ -0,0 +1,57 @@
+package grpc
+
+import (
+	"context"
+	"log"
+	"net"
+
+	pb "spektr/internal/grpc/pb"
+
+	"google.golang.org/grpc"
+)
+
+type server struct {
+	pb.UnimplementedReceiverServiceServer
+	handler Handler
+}
+
+func (s *server) Connect(stream pb.ReceiverService_ConnectServer) error {
+	log.Println("client connected")
+	for {
+		msg, err := stream.Recv()
+		if err != nil {
+			log.Println("client disconnected:", err)
+			return err
+		}
+
+		log.Printf("recv request_id=%s", msg.GetRequestId())
+		resp := s.handler.Handle(stream.Context(), msg)
+		if resp == nil {
+			continue
+		}
+
+		if err := stream.Send(resp); err != nil {
+			log.Println("send error:", err)
+			return err
+		}
+		log.Printf("sent request_id=%s", resp.GetRequestId())
+	}
+}
+
+func Serve(ctx context.Context, addr string, handler Handler) error {
+	lis, err := net.Listen("tcp", addr)
+	if err != nil {
+		return err
+	}
+
+	srv := grpc.NewServer()
+	pb.RegisterReceiverServiceServer(srv, &server{handler: handler})
+
+	go func() {
+		<-ctx.Done()
+		srv.GracefulStop()
+	}()
+
+	log.Println("gRPC listening on", addr)
+	return srv.Serve(lis)
+}