329 lines
11 KiB
Python
329 lines
11 KiB
Python
from __future__ import annotations
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import socket
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import ssl
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import threading
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from typing import Any, Optional, Sequence, Type
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from ..client import ClientProtocol
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from ..datastructures import HeadersLike
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from ..extensions.base import ClientExtensionFactory
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from ..extensions.permessage_deflate import enable_client_permessage_deflate
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from ..headers import validate_subprotocols
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from ..http import USER_AGENT
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from ..http11 import Response
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from ..protocol import CONNECTING, OPEN, Event
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from ..typing import LoggerLike, Origin, Subprotocol
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from ..uri import parse_uri
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from .connection import Connection
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from .utils import Deadline
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__all__ = ["connect", "unix_connect", "ClientConnection"]
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class ClientConnection(Connection):
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"""
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Threaded implementation of a WebSocket client connection.
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:class:`ClientConnection` provides :meth:`recv` and :meth:`send` methods for
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receiving and sending messages.
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It supports iteration to receive messages::
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for message in websocket:
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process(message)
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The iterator exits normally when the connection is closed with close code
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1000 (OK) or 1001 (going away) or without a close code. It raises a
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:exc:`~websockets.exceptions.ConnectionClosedError` when the connection is
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closed with any other code.
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Args:
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socket: Socket connected to a WebSocket server.
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protocol: Sans-I/O connection.
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close_timeout: Timeout for closing the connection in seconds.
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"""
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def __init__(
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self,
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socket: socket.socket,
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protocol: ClientProtocol,
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*,
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close_timeout: Optional[float] = 10,
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) -> None:
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self.protocol: ClientProtocol
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self.response_rcvd = threading.Event()
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super().__init__(
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socket,
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protocol,
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close_timeout=close_timeout,
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)
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def handshake(
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self,
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additional_headers: Optional[HeadersLike] = None,
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user_agent_header: Optional[str] = USER_AGENT,
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timeout: Optional[float] = None,
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) -> None:
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"""
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Perform the opening handshake.
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"""
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with self.send_context(expected_state=CONNECTING):
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self.request = self.protocol.connect()
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if additional_headers is not None:
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self.request.headers.update(additional_headers)
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if user_agent_header is not None:
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self.request.headers["User-Agent"] = user_agent_header
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self.protocol.send_request(self.request)
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if not self.response_rcvd.wait(timeout):
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self.close_socket()
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self.recv_events_thread.join()
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raise TimeoutError("timed out during handshake")
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if self.response is None:
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self.close_socket()
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self.recv_events_thread.join()
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raise ConnectionError("connection closed during handshake")
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if self.protocol.state is not OPEN:
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self.recv_events_thread.join(self.close_timeout)
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self.close_socket()
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self.recv_events_thread.join()
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if self.protocol.handshake_exc is not None:
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raise self.protocol.handshake_exc
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def process_event(self, event: Event) -> None:
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"""
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Process one incoming event.
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"""
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# First event - handshake response.
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if self.response is None:
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assert isinstance(event, Response)
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self.response = event
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self.response_rcvd.set()
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# Later events - frames.
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else:
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super().process_event(event)
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def recv_events(self) -> None:
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"""
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Read incoming data from the socket and process events.
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"""
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try:
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super().recv_events()
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finally:
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# If the connection is closed during the handshake, unblock it.
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self.response_rcvd.set()
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def connect(
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uri: str,
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*,
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# TCP/TLS — unix and path are only for unix_connect()
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sock: Optional[socket.socket] = None,
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ssl_context: Optional[ssl.SSLContext] = None,
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server_hostname: Optional[str] = None,
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unix: bool = False,
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path: Optional[str] = None,
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# WebSocket
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origin: Optional[Origin] = None,
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extensions: Optional[Sequence[ClientExtensionFactory]] = None,
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subprotocols: Optional[Sequence[Subprotocol]] = None,
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additional_headers: Optional[HeadersLike] = None,
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user_agent_header: Optional[str] = USER_AGENT,
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compression: Optional[str] = "deflate",
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# Timeouts
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open_timeout: Optional[float] = 10,
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close_timeout: Optional[float] = 10,
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# Limits
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max_size: Optional[int] = 2**20,
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# Logging
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logger: Optional[LoggerLike] = None,
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# Escape hatch for advanced customization
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create_connection: Optional[Type[ClientConnection]] = None,
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) -> ClientConnection:
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"""
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Connect to the WebSocket server at ``uri``.
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This function returns a :class:`ClientConnection` instance, which you can
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use to send and receive messages.
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:func:`connect` may be used as a context manager::
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async with websockets.sync.client.connect(...) as websocket:
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...
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The connection is closed automatically when exiting the context.
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Args:
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uri: URI of the WebSocket server.
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sock: Preexisting TCP socket. ``sock`` overrides the host and port
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from ``uri``. You may call :func:`socket.create_connection` to
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create a suitable TCP socket.
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ssl_context: Configuration for enabling TLS on the connection.
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server_hostname: Host name for the TLS handshake. ``server_hostname``
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overrides the host name from ``uri``.
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origin: Value of the ``Origin`` header, for servers that require it.
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extensions: List of supported extensions, in order in which they
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should be negotiated and run.
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subprotocols: List of supported subprotocols, in order of decreasing
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preference.
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additional_headers (HeadersLike | None): Arbitrary HTTP headers to add
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to the handshake request.
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user_agent_header: Value of the ``User-Agent`` request header.
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It defaults to ``"Python/x.y.z websockets/X.Y"``.
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Setting it to :obj:`None` removes the header.
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compression: The "permessage-deflate" extension is enabled by default.
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Set ``compression`` to :obj:`None` to disable it. See the
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:doc:`compression guide <../../topics/compression>` for details.
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open_timeout: Timeout for opening the connection in seconds.
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:obj:`None` disables the timeout.
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close_timeout: Timeout for closing the connection in seconds.
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:obj:`None` disables the timeout.
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max_size: Maximum size of incoming messages in bytes.
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:obj:`None` disables the limit.
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logger: Logger for this client.
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It defaults to ``logging.getLogger("websockets.client")``.
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See the :doc:`logging guide <../../topics/logging>` for details.
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create_connection: Factory for the :class:`ClientConnection` managing
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the connection. Set it to a wrapper or a subclass to customize
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connection handling.
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Raises:
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InvalidURI: If ``uri`` isn't a valid WebSocket URI.
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OSError: If the TCP connection fails.
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InvalidHandshake: If the opening handshake fails.
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TimeoutError: If the opening handshake times out.
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"""
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# Process parameters
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wsuri = parse_uri(uri)
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if not wsuri.secure and ssl_context is not None:
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raise TypeError("ssl_context argument is incompatible with a ws:// URI")
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if unix:
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if path is None and sock is None:
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raise TypeError("missing path argument")
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elif path is not None and sock is not None:
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raise TypeError("path and sock arguments are incompatible")
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else:
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assert path is None # private argument, only set by unix_connect()
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if subprotocols is not None:
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validate_subprotocols(subprotocols)
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if compression == "deflate":
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extensions = enable_client_permessage_deflate(extensions)
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elif compression is not None:
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raise ValueError(f"unsupported compression: {compression}")
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# Calculate timeouts on the TCP, TLS, and WebSocket handshakes.
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# The TCP and TLS timeouts must be set on the socket, then removed
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# to avoid conflicting with the WebSocket timeout in handshake().
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deadline = Deadline(open_timeout)
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if create_connection is None:
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create_connection = ClientConnection
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try:
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# Connect socket
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if sock is None:
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if unix:
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sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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sock.settimeout(deadline.timeout())
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assert path is not None # validated above -- this is for mpypy
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sock.connect(path)
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else:
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sock = socket.create_connection(
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(wsuri.host, wsuri.port),
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deadline.timeout(),
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)
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sock.settimeout(None)
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# Disable Nagle algorithm
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if not unix:
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sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True)
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# Initialize TLS wrapper and perform TLS handshake
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if wsuri.secure:
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if ssl_context is None:
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ssl_context = ssl.create_default_context()
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if server_hostname is None:
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server_hostname = wsuri.host
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sock.settimeout(deadline.timeout())
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sock = ssl_context.wrap_socket(sock, server_hostname=server_hostname)
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sock.settimeout(None)
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# Initialize WebSocket connection
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protocol = ClientProtocol(
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wsuri,
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origin=origin,
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extensions=extensions,
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subprotocols=subprotocols,
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state=CONNECTING,
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max_size=max_size,
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logger=logger,
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)
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# Initialize WebSocket protocol
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connection = create_connection(
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sock,
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protocol,
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close_timeout=close_timeout,
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)
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# On failure, handshake() closes the socket and raises an exception.
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connection.handshake(
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additional_headers,
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user_agent_header,
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deadline.timeout(),
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)
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except Exception:
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if sock is not None:
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sock.close()
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raise
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return connection
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def unix_connect(
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path: Optional[str] = None,
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uri: Optional[str] = None,
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**kwargs: Any,
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) -> ClientConnection:
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"""
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Connect to a WebSocket server listening on a Unix socket.
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This function is identical to :func:`connect`, except for the additional
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``path`` argument. It's only available on Unix.
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It's mainly useful for debugging servers listening on Unix sockets.
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Args:
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path: File system path to the Unix socket.
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uri: URI of the WebSocket server. ``uri`` defaults to
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``ws://localhost/`` or, when a ``ssl_context`` is provided, to
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``wss://localhost/``.
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"""
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if uri is None:
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if kwargs.get("ssl_context") is None:
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uri = "ws://localhost/"
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else:
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uri = "wss://localhost/"
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return connect(uri=uri, unix=True, path=path, **kwargs)
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