temp: temporty quic impl

libp2p/transport/quic/transport.py

@@ -0,0 +1,331 @@
+"""
+QUIC Transport implementation for py-libp2p.
+Uses aioquic's sans-IO core with trio for native async support.
+Based on aioquic library with interface consistency to go-libp2p and js-libp2p.
+"""
+
+import copy
+import logging
+
+from aioquic.quic.configuration import (
+    QuicConfiguration,
+)
+from aioquic.quic.connection import (
+    QuicConnection,
+)
+import multiaddr
+from multiaddr import (
+    Multiaddr,
+)
+import trio
+
+from libp2p.abc import (
+    IListener,
+    IRawConnection,
+    ITransport,
+)
+from libp2p.crypto.keys import (
+    PrivateKey,
+)
+from libp2p.peer.id import (
+    ID,
+)
+
+from .config import (
+    QUICTransportConfig,
+)
+from .connection import (
+    QUICConnection,
+)
+from .exceptions import (
+    QUICDialError,
+    QUICListenError,
+)
+
+logger = logging.getLogger(__name__)
+
+
+class QUICListener(IListener):
+    async def close(self):
+        pass
+
+    async def listen(self, maddr: Multiaddr, nursery: trio.Nursery) -> bool:
+        return False
+
+    def get_addrs(self) -> tuple[Multiaddr, ...]:
+        return ()
+
+
+class QUICTransport(ITransport):
+    """
+    QUIC Transport implementation following libp2p transport interface.
+
+    Uses aioquic's sans-IO core with trio for native async support.
+    Supports both QUIC v1 (RFC 9000) and draft-29 for compatibility with
+    go-libp2p and js-libp2p implementations.
+    """
+
+    # Protocol identifiers matching go-libp2p
+    PROTOCOL_QUIC_V1 = "/quic-v1"  # RFC 9000
+    PROTOCOL_QUIC_DRAFT29 = "/quic"  # draft-29
+
+    def __init__(
+        self, private_key: PrivateKey, config: QUICTransportConfig | None = None
+    ):
+        """
+        Initialize QUIC transport.
+
+        Args:
+            private_key: libp2p private key for identity and TLS cert generation
+            config: QUIC transport configuration options
+
+        """
+        self._private_key = private_key
+        self._peer_id = ID.from_pubkey(private_key.get_public_key())
+        self._config = config or QUICTransportConfig()
+
+        # Connection management
+        self._connections: dict[str, QUICConnection] = {}
+        self._listeners: list[QUICListener] = []
+
+        # QUIC configurations for different versions
+        self._quic_configs: dict[str, QuicConfiguration] = {}
+        self._setup_quic_configurations()
+
+        # Resource management
+        self._closed = False
+        self._nursery_manager = trio.CapacityLimiter(1)
+
+        logger.info(f"Initialized QUIC transport for peer {self._peer_id}")
+
+    def _setup_quic_configurations(self) -> None:
+        """Setup QUIC configurations for supported protocol versions."""
+        # Base configuration
+        base_config = QuicConfiguration(
+            is_client=False,
+            alpn_protocols=["libp2p"],
+            verify_mode=self._config.verify_mode,
+            max_datagram_frame_size=self._config.max_datagram_size,
+            idle_timeout=self._config.idle_timeout,
+        )
+
+        # Add TLS certificate generated from libp2p private key
+        self._setup_tls_configuration(base_config)
+
+        # QUIC v1 (RFC 9000) configuration
+        quic_v1_config = copy.deepcopy(base_config)
+        quic_v1_config.supported_versions = [0x00000001]  # QUIC v1
+        self._quic_configs[self.PROTOCOL_QUIC_V1] = quic_v1_config
+
+        # QUIC draft-29 configuration for compatibility
+        if self._config.enable_draft29:
+            draft29_config = copy.deepcopy(base_config)
+            draft29_config.supported_versions = [0xFF00001D]  # draft-29
+            self._quic_configs[self.PROTOCOL_QUIC_DRAFT29] = draft29_config
+
+    def _setup_tls_configuration(self, config: QuicConfiguration) -> None:
+        """
+        Setup TLS configuration with libp2p identity integration.
+        Similar to go-libp2p's certificate generation approach.
+        """
+        from .security import (
+            generate_libp2p_tls_config,
+        )
+
+        # Generate TLS certificate with embedded libp2p peer ID
+        # This follows the libp2p TLS spec for peer identity verification
+        tls_config = generate_libp2p_tls_config(self._private_key, self._peer_id)
+
+        config.load_cert_chain(tls_config.cert_file, tls_config.key_file)
+        if tls_config.ca_file:
+            config.load_verify_locations(tls_config.ca_file)
+
+    async def dial(
+        self, maddr: multiaddr.Multiaddr, peer_id: ID | None = None
+    ) -> IRawConnection:
+        """
+        Dial a remote peer using QUIC transport.
+
+        Args:
+            maddr: Multiaddr of the remote peer (e.g., /ip4/1.2.3.4/udp/4001/quic-v1)
+            peer_id: Expected peer ID for verification
+
+        Returns:
+            Raw connection interface to the remote peer
+
+        Raises:
+            QUICDialError: If dialing fails
+
+        """
+        if self._closed:
+            raise QUICDialError("Transport is closed")
+
+        if not is_quic_multiaddr(maddr):
+            raise QUICDialError(f"Invalid QUIC multiaddr: {maddr}")
+
+        try:
+            # Extract connection details from multiaddr
+            host, port = quic_multiaddr_to_endpoint(maddr)
+            quic_version = multiaddr_to_quic_version(maddr)
+
+            # Get appropriate QUIC configuration
+            config = self._quic_configs.get(quic_version)
+            if not config:
+                raise QUICDialError(f"Unsupported QUIC version: {quic_version}")
+
+            # Create client configuration
+            client_config = copy.deepcopy(config)
+            client_config.is_client = True
+
+            logger.debug(
+                f"Dialing QUIC connection to {host}:{port} (version: {quic_version})"
+            )
+
+            # Create QUIC connection using aioquic's sans-IO core
+            quic_connection = QuicConnection(configuration=client_config)
+
+            # Create trio-based QUIC connection wrapper
+            connection = QUICConnection(
+                quic_connection=quic_connection,
+                remote_addr=(host, port),
+                peer_id=peer_id,
+                local_peer_id=self._peer_id,
+                is_initiator=True,
+                maddr=maddr,
+                transport=self,
+            )
+
+            # Establish connection using trio
+            await connection.connect()
+
+            # Store connection for management
+            conn_id = f"{host}:{port}:{peer_id}"
+            self._connections[conn_id] = connection
+
+            # Perform libp2p handshake verification
+            await connection.verify_peer_identity()
+
+            logger.info(f"Successfully dialed QUIC connection to {peer_id}")
+            return connection
+
+        except Exception as e:
+            logger.error(f"Failed to dial QUIC connection to {maddr}: {e}")
+            raise QUICDialError(f"Dial failed: {e}") from e
+
+    def create_listener(
+        self, handler_function: Callable[[ReadWriteCloser], None]
+    ) -> IListener:
+        """
+        Create a QUIC listener.
+
+        Args:
+            handler_function: Function to handle new connections
+
+        Returns:
+            QUIC listener instance
+
+        """
+        if self._closed:
+            raise QUICListenError("Transport is closed")
+
+        # TODO: Create QUIC Listener
+        # listener = QUICListener(
+        #     transport=self,
+        #     handler_function=handler_function,
+        #     quic_configs=self._quic_configs,
+        #     config=self._config,
+        # )
+        listener = QUICListener()
+
+        self._listeners.append(listener)
+        return listener
+
+    def can_dial(self, maddr: multiaddr.Multiaddr) -> bool:
+        """
+        Check if this transport can dial the given multiaddr.
+
+        Args:
+            maddr: Multiaddr to check
+
+        Returns:
+            True if this transport can dial the address
+
+        """
+        return is_quic_multiaddr(maddr)
+
+    def protocols(self) -> list[str]:
+        """
+        Get supported protocol identifiers.
+
+        Returns:
+            List of supported protocol strings
+
+        """
+        protocols = [self.PROTOCOL_QUIC_V1]
+        if self._config.enable_draft29:
+            protocols.append(self.PROTOCOL_QUIC_DRAFT29)
+        return protocols
+
+    def listen_order(self) -> int:
+        """
+        Get the listen order priority for this transport.
+        Matches go-libp2p's ListenOrder = 1 for QUIC.
+
+        Returns:
+            Priority order for listening (lower = higher priority)
+
+        """
+        return 1
+
+    async def close(self) -> None:
+        """Close the transport and cleanup resources."""
+        if self._closed:
+            return
+
+        self._closed = True
+        logger.info("Closing QUIC transport")
+
+        # Close all active connections and listeners concurrently using trio nursery
+        async with trio.open_nursery() as nursery:
+            # Close all connections
+            for connection in self._connections.values():
+                nursery.start_soon(connection.close)
+
+            # Close all listeners
+            for listener in self._listeners:
+                nursery.start_soon(listener.close)
+
+        self._connections.clear()
+        self._listeners.clear()
+
+        logger.info("QUIC transport closed")
+
+    def __str__(self) -> str:
+        """String representation of the transport."""
+        return f"QUICTransport(peer_id={self._peer_id}, protocols={self.protocols()})"
+
+
+def new_transport(
+    private_key: PrivateKey, config: QUICTransportConfig | None = None, **kwargs
+) -> QUICTransport:
+    """
+    Factory function to create a new QUIC transport.
+    Follows the naming convention from go-libp2p (NewTransport).
+
+    Args:
+        private_key: libp2p private key
+        config: Transport configuration
+        **kwargs: Additional configuration options
+
+    Returns:
+        New QUIC transport instance
+
+    """
+    if config is None:
+        config = QUICTransportConfig(**kwargs)
+
+    return QUICTransport(private_key, config)
+
+
+# Type aliases for consistency with go-libp2p
+NewTransport = new_transport  # go-libp2p style naming