Prepare v2ray client/server transport

transport/v2raygrpc/server.go

@@ -0,0 +1,53 @@
+package v2raygrpc
+
+import (
+	"context"
+	"crypto/tls"
+	"net"
+
+	"github.com/sagernet/sing-box/adapter"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
+)
+
+var _ adapter.V2RayServerTransport = (*Server)(nil)
+
+type Server struct {
+	ctx     context.Context
+	handler N.TCPConnectionHandler
+	server  *grpc.Server
+}
+
+func NewServer(ctx context.Context, serviceName string, tlsConfig *tls.Config, handler N.TCPConnectionHandler) *Server {
+	var serverOptions []grpc.ServerOption
+	if tlsConfig != nil {
+		tlsConfig.NextProtos = []string{"h2"}
+		serverOptions = append(serverOptions, grpc.Creds(credentials.NewTLS(tlsConfig)))
+	}
+	server := &Server{ctx, handler, grpc.NewServer(serverOptions...)}
+	RegisterGunServiceCustomNameServer(server.server, server, serviceName)
+	return server
+}
+
+func (s *Server) Tun(server GunService_TunServer) error {
+	ctx, cancel := context.WithCancel(s.ctx)
+	conn := NewGRPCConn(server, cancel)
+	go s.handler.NewConnection(ctx, conn, M.Metadata{})
+	<-ctx.Done()
+	return nil
+}
+
+func (s *Server) mustEmbedUnimplementedGunServiceServer() {
+}
+
+func (s *Server) Serve(listener net.Listener) error {
+	return s.server.Serve(listener)
+}
+
+func (s *Server) Close() error {
+	s.server.Stop()
+	return nil
+}