mirror of
https://github.com/varun-r-mallya/py-libp2p.git
synced 2025-12-31 20:36:24 +00:00
a0cb6e3a30
- Add TLS configuration support to new_host and new_swarm functions - Fix WebSocket transport tests (test_wss_host_pair_data_exchange, test_wss_listen_without_tls_config) - Integrate TLS configuration with transport registry for proper WebSocket WSS support - Move debug files to downloads directory for future reference - All 47 WebSocket tests now passing including WSS functionality - Maintain backward compatibility with existing code - Resolve all type checking and linting issues
230 lines
8.8 KiB
Python
230 lines
8.8 KiB
Python
import logging
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import ssl
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from multiaddr import Multiaddr
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from libp2p.abc import IListener, ITransport
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from libp2p.custom_types import THandler
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from libp2p.network.connection.raw_connection import RawConnection
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from libp2p.transport.exceptions import OpenConnectionError
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from libp2p.transport.upgrader import TransportUpgrader
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from libp2p.transport.websocket.multiaddr_utils import parse_websocket_multiaddr
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from .connection import P2PWebSocketConnection
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from .listener import WebsocketListener
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logger = logging.getLogger(__name__)
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class WebsocketTransport(ITransport):
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"""
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Libp2p WebSocket transport: dial and listen on /ip4/.../tcp/.../ws and /wss
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Implements production-ready WebSocket transport with:
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- Flow control and buffer management
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- Connection limits and rate limiting
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- Proper error handling and cleanup
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- Support for both WS and WSS protocols
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- TLS configuration and handshake timeout
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"""
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def __init__(
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self,
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upgrader: TransportUpgrader,
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tls_client_config: ssl.SSLContext | None = None,
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tls_server_config: ssl.SSLContext | None = None,
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handshake_timeout: float = 15.0,
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max_buffered_amount: int = 4 * 1024 * 1024,
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):
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self._upgrader = upgrader
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self._tls_client_config = tls_client_config
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self._tls_server_config = tls_server_config
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self._handshake_timeout = handshake_timeout
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self._max_buffered_amount = max_buffered_amount
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self._connection_count = 0
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self._max_connections = 1000 # Production limit
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async def dial(self, maddr: Multiaddr) -> RawConnection:
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"""Dial a WebSocket connection to the given multiaddr."""
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logger.debug(f"WebsocketTransport.dial called with {maddr}")
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# Parse the WebSocket multiaddr to determine if it's secure
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try:
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parsed = parse_websocket_multiaddr(maddr)
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except ValueError as e:
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raise ValueError(f"Invalid WebSocket multiaddr: {e}") from e
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# Extract host and port from the base multiaddr
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host = (
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parsed.rest_multiaddr.value_for_protocol("ip4")
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or parsed.rest_multiaddr.value_for_protocol("ip6")
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or parsed.rest_multiaddr.value_for_protocol("dns")
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or parsed.rest_multiaddr.value_for_protocol("dns4")
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or parsed.rest_multiaddr.value_for_protocol("dns6")
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)
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port_str = parsed.rest_multiaddr.value_for_protocol("tcp")
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if port_str is None:
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raise ValueError(f"No TCP port found in multiaddr: {maddr}")
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port = int(port_str)
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# Build WebSocket URL based on security
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if parsed.is_wss:
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ws_url = f"wss://{host}:{port}/"
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else:
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ws_url = f"ws://{host}:{port}/"
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logger.debug(
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f"WebsocketTransport.dial connecting to {ws_url} (secure={parsed.is_wss})"
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)
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try:
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# Check connection limits
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if self._connection_count >= self._max_connections:
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raise OpenConnectionError(
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f"Maximum connections reached: {self._max_connections}"
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)
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# Prepare SSL context for WSS connections
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ssl_context = None
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if parsed.is_wss:
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if self._tls_client_config:
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ssl_context = self._tls_client_config
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else:
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# Create default SSL context for client
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ssl_context = ssl.create_default_context()
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# Set SNI if available
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if parsed.sni:
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ssl_context.check_hostname = False
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ssl_context.verify_mode = ssl.CERT_NONE
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logger.debug(f"WebsocketTransport.dial opening connection to {ws_url}")
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# Use a different approach: start background nursery that will persist
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logger.debug("WebsocketTransport.dial establishing connection")
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# Import trio-websocket functions
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from trio_websocket import connect_websocket
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from trio_websocket._impl import _url_to_host
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# Parse the WebSocket URL to get host, port, resource
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# like trio-websocket does
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ws_host, ws_port, ws_resource, ws_ssl_context = _url_to_host(
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ws_url, ssl_context
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)
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logger.debug(
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f"WebsocketTransport.dial parsed URL: host={ws_host}, "
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f"port={ws_port}, resource={ws_resource}"
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)
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# Create a background task manager for this connection
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import trio
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nursery_manager = trio.lowlevel.current_task().parent_nursery
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if nursery_manager is None:
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raise OpenConnectionError(
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f"No parent nursery available for WebSocket connection to {maddr}"
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)
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# Apply timeout to the connection process
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with trio.fail_after(self._handshake_timeout):
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logger.debug("WebsocketTransport.dial connecting WebSocket")
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ws = await connect_websocket(
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nursery_manager, # Use the existing nursery from libp2p
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ws_host,
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ws_port,
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ws_resource,
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use_ssl=ws_ssl_context,
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message_queue_size=1024, # Reasonable defaults
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max_message_size=16 * 1024 * 1024, # 16MB max message
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)
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logger.debug("WebsocketTransport.dial WebSocket connection established")
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# Create our connection wrapper with both WSS support and flow control
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conn = P2PWebSocketConnection(
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ws,
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None,
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is_secure=parsed.is_wss,
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max_buffered_amount=self._max_buffered_amount,
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)
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logger.debug("WebsocketTransport.dial created P2PWebSocketConnection")
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self._connection_count += 1
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logger.debug(f"Total connections: {self._connection_count}")
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return RawConnection(conn, initiator=True)
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except trio.TooSlowError as e:
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raise OpenConnectionError(
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f"WebSocket handshake timeout after {self._handshake_timeout}s "
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f"for {maddr}"
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) from e
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except Exception as e:
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logger.error(f"Failed to dial WebSocket {maddr}: {e}")
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raise OpenConnectionError(f"Failed to dial WebSocket {maddr}: {e}") from e
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def create_listener(self, handler: THandler) -> IListener: # type: ignore[override]
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"""
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The type checker is incorrectly reporting this as an inconsistent override.
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"""
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logger.debug("WebsocketTransport.create_listener called")
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return WebsocketListener(
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handler, self._upgrader, self._tls_server_config, self._handshake_timeout
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)
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def resolve(self, maddr: Multiaddr) -> list[Multiaddr]:
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"""
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Resolve a WebSocket multiaddr, automatically adding SNI for DNS names.
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Similar to Go's Resolve() method.
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:param maddr: The multiaddr to resolve
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:return: List of resolved multiaddrs
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"""
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try:
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parsed = parse_websocket_multiaddr(maddr)
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except ValueError as e:
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logger.debug(f"Invalid WebSocket multiaddr for resolution: {e}")
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return [maddr] # Return original if not a valid WebSocket multiaddr
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logger.debug(
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f"Parsed multiaddr {maddr}: is_wss={parsed.is_wss}, sni={parsed.sni}"
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)
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if not parsed.is_wss:
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# No /tls/ws component, this isn't a secure websocket multiaddr
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return [maddr]
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if parsed.sni is not None:
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# Already has SNI, return as-is
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return [maddr]
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# Try to extract DNS name from the base multiaddr
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dns_name = None
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for protocol_name in ["dns", "dns4", "dns6"]:
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try:
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dns_name = parsed.rest_multiaddr.value_for_protocol(protocol_name)
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break
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except Exception:
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continue
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if dns_name is None:
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# No DNS name found, return original
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return [maddr]
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# Create new multiaddr with SNI
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# For /dns/example.com/tcp/8080/wss ->
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# /dns/example.com/tcp/8080/tls/sni/example.com/ws
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try:
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# Remove /wss and add /tls/sni/example.com/ws
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without_wss = maddr.decapsulate(Multiaddr("/wss"))
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sni_component = Multiaddr(f"/sni/{dns_name}")
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resolved = (
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without_wss.encapsulate(Multiaddr("/tls"))
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.encapsulate(sni_component)
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.encapsulate(Multiaddr("/ws"))
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)
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logger.debug(f"Resolved {maddr} to {resolved}")
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return [resolved]
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except Exception as e:
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logger.debug(f"Failed to resolve multiaddr {maddr}: {e}")
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return [maddr]
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