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95 lines
2.8 KiB
95 lines
2.8 KiB
9 months ago
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"""
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wsproto
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~~~~~~~
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A WebSocket implementation.
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"""
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from typing import Generator, Optional, Union
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from .connection import Connection, ConnectionState, ConnectionType
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from .events import Event
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from .handshake import H11Handshake
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from .typing import Headers
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__version__ = "1.2.0"
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class WSConnection:
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"""
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Represents the local end of a WebSocket connection to a remote peer.
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"""
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def __init__(self, connection_type: ConnectionType) -> None:
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"""
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Constructor
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:param wsproto.connection.ConnectionType connection_type: Controls
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whether the library behaves as a client or as a server.
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"""
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self.client = connection_type is ConnectionType.CLIENT
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self.handshake = H11Handshake(connection_type)
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self.connection: Optional[Connection] = None
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@property
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def state(self) -> ConnectionState:
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"""
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:returns: Connection state
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:rtype: wsproto.connection.ConnectionState
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"""
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if self.connection is None:
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return self.handshake.state
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return self.connection.state
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def initiate_upgrade_connection(
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self, headers: Headers, path: Union[bytes, str]
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) -> None:
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self.handshake.initiate_upgrade_connection(headers, path)
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def send(self, event: Event) -> bytes:
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"""
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Generate network data for the specified event.
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When you want to communicate with a WebSocket peer, you should construct
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an event and pass it to this method. This method will return the bytes
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that you should send to the peer.
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:param wsproto.events.Event event: The event to generate data for
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:returns bytes: The data to send to the peer
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"""
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data = b""
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if self.connection is None:
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data += self.handshake.send(event)
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self.connection = self.handshake.connection
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else:
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data += self.connection.send(event)
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return data
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def receive_data(self, data: Optional[bytes]) -> None:
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"""
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Feed network data into the connection instance.
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After calling this method, you should call :meth:`events` to see if the
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received data triggered any new events.
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:param bytes data: Data received from remote peer
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"""
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if self.connection is None:
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self.handshake.receive_data(data)
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self.connection = self.handshake.connection
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else:
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self.connection.receive_data(data)
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def events(self) -> Generator[Event, None, None]:
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"""
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A generator that yields pending events.
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Each event is an instance of a subclass of
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:class:`wsproto.events.Event`.
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"""
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yield from self.handshake.events()
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if self.connection is not None:
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yield from self.connection.events()
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__all__ = ("ConnectionType", "WSConnection")
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