mirror of https://github.com/morpheus65535/bazarr
527 lines
25 KiB
Python
527 lines
25 KiB
Python
import asyncio
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import engineio
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import six
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from . import asyncio_manager
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from . import exceptions
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from . import packet
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from . import server
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class AsyncServer(server.Server):
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"""A Socket.IO server for asyncio.
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This class implements a fully compliant Socket.IO web server with support
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for websocket and long-polling transports, compatible with the asyncio
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framework on Python 3.5 or newer.
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:param client_manager: The client manager instance that will manage the
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client list. When this is omitted, the client list
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is stored in an in-memory structure, so the use of
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multiple connected servers is not possible.
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:param logger: To enable logging set to ``True`` or pass a logger object to
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use. To disable logging set to ``False``.
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:param json: An alternative json module to use for encoding and decoding
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packets. Custom json modules must have ``dumps`` and ``loads``
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functions that are compatible with the standard library
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versions.
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:param async_handlers: If set to ``True``, event handlers are executed in
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separate threads. To run handlers synchronously,
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set to ``False``. The default is ``True``.
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:param kwargs: Connection parameters for the underlying Engine.IO server.
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The Engine.IO configuration supports the following settings:
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:param async_mode: The asynchronous model to use. See the Deployment
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section in the documentation for a description of the
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available options. Valid async modes are "aiohttp". If
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this argument is not given, an async mode is chosen
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based on the installed packages.
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:param ping_timeout: The time in seconds that the client waits for the
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server to respond before disconnecting.
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:param ping_interval: The interval in seconds at which the client pings
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the server.
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:param max_http_buffer_size: The maximum size of a message when using the
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polling transport.
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:param allow_upgrades: Whether to allow transport upgrades or not.
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:param http_compression: Whether to compress packages when using the
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polling transport.
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:param compression_threshold: Only compress messages when their byte size
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is greater than this value.
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:param cookie: Name of the HTTP cookie that contains the client session
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id. If set to ``None``, a cookie is not sent to the client.
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:param cors_allowed_origins: Origin or list of origins that are allowed to
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connect to this server. Only the same origin
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is allowed by default. Set this argument to
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``'*'`` to allow all origins, or to ``[]`` to
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disable CORS handling.
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:param cors_credentials: Whether credentials (cookies, authentication) are
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allowed in requests to this server.
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:param monitor_clients: If set to ``True``, a background task will ensure
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inactive clients are closed. Set to ``False`` to
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disable the monitoring task (not recommended). The
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default is ``True``.
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:param engineio_logger: To enable Engine.IO logging set to ``True`` or pass
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a logger object to use. To disable logging set to
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``False``.
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"""
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def __init__(self, client_manager=None, logger=False, json=None,
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async_handlers=True, **kwargs):
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if client_manager is None:
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client_manager = asyncio_manager.AsyncManager()
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super().__init__(client_manager=client_manager, logger=logger,
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binary=False, json=json,
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async_handlers=async_handlers, **kwargs)
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def is_asyncio_based(self):
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return True
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def attach(self, app, socketio_path='socket.io'):
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"""Attach the Socket.IO server to an application."""
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self.eio.attach(app, socketio_path)
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async def emit(self, event, data=None, to=None, room=None, skip_sid=None,
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namespace=None, callback=None, **kwargs):
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"""Emit a custom event to one or more connected clients.
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:param event: The event name. It can be any string. The event names
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``'connect'``, ``'message'`` and ``'disconnect'`` are
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reserved and should not be used.
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:param data: The data to send to the client or clients. Data can be of
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type ``str``, ``bytes``, ``list`` or ``dict``. If a
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``list`` or ``dict``, the data will be serialized as JSON.
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:param to: The recipient of the message. This can be set to the
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session ID of a client to address only that client, or to
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to any custom room created by the application to address all
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the clients in that room, If this argument is omitted the
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event is broadcasted to all connected clients.
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:param room: Alias for the ``to`` parameter.
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:param skip_sid: The session ID of a client to skip when broadcasting
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to a room or to all clients. This can be used to
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prevent a message from being sent to the sender.
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:param namespace: The Socket.IO namespace for the event. If this
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argument is omitted the event is emitted to the
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default namespace.
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:param callback: If given, this function will be called to acknowledge
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the the client has received the message. The arguments
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that will be passed to the function are those provided
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by the client. Callback functions can only be used
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when addressing an individual client.
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:param ignore_queue: Only used when a message queue is configured. If
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set to ``True``, the event is emitted to the
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clients directly, without going through the queue.
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This is more efficient, but only works when a
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single server process is used. It is recommended
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to always leave this parameter with its default
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value of ``False``.
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Note: this method is a coroutine.
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"""
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namespace = namespace or '/'
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room = to or room
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self.logger.info('emitting event "%s" to %s [%s]', event,
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room or 'all', namespace)
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await self.manager.emit(event, data, namespace, room=room,
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skip_sid=skip_sid, callback=callback,
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**kwargs)
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async def send(self, data, to=None, room=None, skip_sid=None,
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namespace=None, callback=None, **kwargs):
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"""Send a message to one or more connected clients.
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This function emits an event with the name ``'message'``. Use
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:func:`emit` to issue custom event names.
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:param data: The data to send to the client or clients. Data can be of
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type ``str``, ``bytes``, ``list`` or ``dict``. If a
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``list`` or ``dict``, the data will be serialized as JSON.
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:param to: The recipient of the message. This can be set to the
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session ID of a client to address only that client, or to
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to any custom room created by the application to address all
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the clients in that room, If this argument is omitted the
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event is broadcasted to all connected clients.
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:param room: Alias for the ``to`` parameter.
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:param skip_sid: The session ID of a client to skip when broadcasting
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to a room or to all clients. This can be used to
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prevent a message from being sent to the sender.
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:param namespace: The Socket.IO namespace for the event. If this
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argument is omitted the event is emitted to the
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default namespace.
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:param callback: If given, this function will be called to acknowledge
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the the client has received the message. The arguments
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that will be passed to the function are those provided
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by the client. Callback functions can only be used
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when addressing an individual client.
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:param ignore_queue: Only used when a message queue is configured. If
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set to ``True``, the event is emitted to the
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clients directly, without going through the queue.
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This is more efficient, but only works when a
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single server process is used. It is recommended
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to always leave this parameter with its default
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value of ``False``.
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Note: this method is a coroutine.
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"""
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await self.emit('message', data=data, to=to, room=room,
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skip_sid=skip_sid, namespace=namespace,
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callback=callback, **kwargs)
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async def call(self, event, data=None, to=None, sid=None, namespace=None,
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timeout=60, **kwargs):
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"""Emit a custom event to a client and wait for the response.
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:param event: The event name. It can be any string. The event names
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``'connect'``, ``'message'`` and ``'disconnect'`` are
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reserved and should not be used.
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:param data: The data to send to the client or clients. Data can be of
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type ``str``, ``bytes``, ``list`` or ``dict``. If a
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``list`` or ``dict``, the data will be serialized as JSON.
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:param to: The session ID of the recipient client.
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:param sid: Alias for the ``to`` parameter.
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:param namespace: The Socket.IO namespace for the event. If this
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argument is omitted the event is emitted to the
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default namespace.
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:param timeout: The waiting timeout. If the timeout is reached before
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the client acknowledges the event, then a
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``TimeoutError`` exception is raised.
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:param ignore_queue: Only used when a message queue is configured. If
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set to ``True``, the event is emitted to the
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client directly, without going through the queue.
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This is more efficient, but only works when a
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single server process is used. It is recommended
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to always leave this parameter with its default
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value of ``False``.
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"""
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if not self.async_handlers:
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raise RuntimeError(
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'Cannot use call() when async_handlers is False.')
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callback_event = self.eio.create_event()
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callback_args = []
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def event_callback(*args):
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callback_args.append(args)
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callback_event.set()
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await self.emit(event, data=data, room=to or sid, namespace=namespace,
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callback=event_callback, **kwargs)
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try:
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await asyncio.wait_for(callback_event.wait(), timeout)
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except asyncio.TimeoutError:
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six.raise_from(exceptions.TimeoutError(), None)
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return callback_args[0] if len(callback_args[0]) > 1 \
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else callback_args[0][0] if len(callback_args[0]) == 1 \
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else None
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async def close_room(self, room, namespace=None):
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"""Close a room.
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This function removes all the clients from the given room.
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:param room: Room name.
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:param namespace: The Socket.IO namespace for the event. If this
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argument is omitted the default namespace is used.
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Note: this method is a coroutine.
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"""
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namespace = namespace or '/'
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self.logger.info('room %s is closing [%s]', room, namespace)
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await self.manager.close_room(room, namespace)
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async def get_session(self, sid, namespace=None):
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"""Return the user session for a client.
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:param sid: The session id of the client.
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:param namespace: The Socket.IO namespace. If this argument is omitted
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the default namespace is used.
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The return value is a dictionary. Modifications made to this
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dictionary are not guaranteed to be preserved. If you want to modify
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the user session, use the ``session`` context manager instead.
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"""
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namespace = namespace or '/'
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eio_session = await self.eio.get_session(sid)
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return eio_session.setdefault(namespace, {})
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async def save_session(self, sid, session, namespace=None):
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"""Store the user session for a client.
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:param sid: The session id of the client.
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:param session: The session dictionary.
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:param namespace: The Socket.IO namespace. If this argument is omitted
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the default namespace is used.
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"""
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namespace = namespace or '/'
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eio_session = await self.eio.get_session(sid)
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eio_session[namespace] = session
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def session(self, sid, namespace=None):
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"""Return the user session for a client with context manager syntax.
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:param sid: The session id of the client.
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This is a context manager that returns the user session dictionary for
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the client. Any changes that are made to this dictionary inside the
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context manager block are saved back to the session. Example usage::
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@eio.on('connect')
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def on_connect(sid, environ):
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username = authenticate_user(environ)
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if not username:
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return False
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with eio.session(sid) as session:
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session['username'] = username
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@eio.on('message')
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def on_message(sid, msg):
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async with eio.session(sid) as session:
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print('received message from ', session['username'])
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"""
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class _session_context_manager(object):
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def __init__(self, server, sid, namespace):
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self.server = server
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self.sid = sid
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self.namespace = namespace
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self.session = None
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async def __aenter__(self):
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self.session = await self.server.get_session(
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sid, namespace=self.namespace)
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return self.session
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async def __aexit__(self, *args):
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await self.server.save_session(sid, self.session,
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namespace=self.namespace)
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return _session_context_manager(self, sid, namespace)
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async def disconnect(self, sid, namespace=None):
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"""Disconnect a client.
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:param sid: Session ID of the client.
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:param namespace: The Socket.IO namespace to disconnect. If this
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argument is omitted the default namespace is used.
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Note: this method is a coroutine.
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"""
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namespace = namespace or '/'
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if self.manager.is_connected(sid, namespace=namespace):
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self.logger.info('Disconnecting %s [%s]', sid, namespace)
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self.manager.pre_disconnect(sid, namespace=namespace)
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await self._send_packet(sid, packet.Packet(packet.DISCONNECT,
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namespace=namespace))
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await self._trigger_event('disconnect', namespace, sid)
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self.manager.disconnect(sid, namespace=namespace)
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if namespace == '/':
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await self.eio.disconnect(sid)
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async def handle_request(self, *args, **kwargs):
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"""Handle an HTTP request from the client.
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This is the entry point of the Socket.IO application. This function
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returns the HTTP response body to deliver to the client.
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Note: this method is a coroutine.
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"""
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return await self.eio.handle_request(*args, **kwargs)
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def start_background_task(self, target, *args, **kwargs):
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"""Start a background task using the appropriate async model.
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This is a utility function that applications can use to start a
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background task using the method that is compatible with the
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selected async mode.
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:param target: the target function to execute. Must be a coroutine.
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:param args: arguments to pass to the function.
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:param kwargs: keyword arguments to pass to the function.
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The return value is a ``asyncio.Task`` object.
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Note: this method is a coroutine.
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"""
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return self.eio.start_background_task(target, *args, **kwargs)
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async def sleep(self, seconds=0):
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"""Sleep for the requested amount of time using the appropriate async
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model.
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This is a utility function that applications can use to put a task to
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sleep without having to worry about using the correct call for the
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selected async mode.
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Note: this method is a coroutine.
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"""
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return await self.eio.sleep(seconds)
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async def _emit_internal(self, sid, event, data, namespace=None, id=None):
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"""Send a message to a client."""
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# tuples are expanded to multiple arguments, everything else is sent
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# as a single argument
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if isinstance(data, tuple):
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data = list(data)
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else:
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data = [data]
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await self._send_packet(sid, packet.Packet(
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packet.EVENT, namespace=namespace, data=[event] + data, id=id,
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binary=None))
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async def _send_packet(self, sid, pkt):
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"""Send a Socket.IO packet to a client."""
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encoded_packet = pkt.encode()
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if isinstance(encoded_packet, list):
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binary = False
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for ep in encoded_packet:
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await self.eio.send(sid, ep, binary=binary)
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binary = True
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else:
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await self.eio.send(sid, encoded_packet, binary=False)
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async def _handle_connect(self, sid, namespace):
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"""Handle a client connection request."""
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namespace = namespace or '/'
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self.manager.connect(sid, namespace)
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if self.always_connect:
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await self._send_packet(sid, packet.Packet(packet.CONNECT,
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namespace=namespace))
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fail_reason = None
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try:
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success = await self._trigger_event('connect', namespace, sid,
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self.environ[sid])
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except exceptions.ConnectionRefusedError as exc:
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fail_reason = exc.error_args
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success = False
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if success is False:
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if self.always_connect:
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self.manager.pre_disconnect(sid, namespace)
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await self._send_packet(sid, packet.Packet(
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packet.DISCONNECT, data=fail_reason, namespace=namespace))
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self.manager.disconnect(sid, namespace)
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if not self.always_connect:
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await self._send_packet(sid, packet.Packet(
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packet.ERROR, data=fail_reason, namespace=namespace))
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if sid in self.environ: # pragma: no cover
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del self.environ[sid]
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elif not self.always_connect:
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await self._send_packet(sid, packet.Packet(packet.CONNECT,
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namespace=namespace))
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async def _handle_disconnect(self, sid, namespace):
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"""Handle a client disconnect."""
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namespace = namespace or '/'
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if namespace == '/':
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namespace_list = list(self.manager.get_namespaces())
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else:
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namespace_list = [namespace]
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for n in namespace_list:
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if n != '/' and self.manager.is_connected(sid, n):
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await self._trigger_event('disconnect', n, sid)
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self.manager.disconnect(sid, n)
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if namespace == '/' and self.manager.is_connected(sid, namespace):
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await self._trigger_event('disconnect', '/', sid)
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self.manager.disconnect(sid, '/')
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async def _handle_event(self, sid, namespace, id, data):
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"""Handle an incoming client event."""
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namespace = namespace or '/'
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self.logger.info('received event "%s" from %s [%s]', data[0], sid,
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namespace)
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if not self.manager.is_connected(sid, namespace):
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self.logger.warning('%s is not connected to namespace %s',
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sid, namespace)
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return
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if self.async_handlers:
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self.start_background_task(self._handle_event_internal, self, sid,
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data, namespace, id)
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else:
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await self._handle_event_internal(self, sid, data, namespace, id)
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async def _handle_event_internal(self, server, sid, data, namespace, id):
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r = await server._trigger_event(data[0], namespace, sid, *data[1:])
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if id is not None:
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# send ACK packet with the response returned by the handler
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# tuples are expanded as multiple arguments
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if r is None:
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data = []
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elif isinstance(r, tuple):
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data = list(r)
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else:
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data = [r]
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await server._send_packet(sid, packet.Packet(packet.ACK,
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namespace=namespace,
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id=id, data=data,
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binary=None))
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async def _handle_ack(self, sid, namespace, id, data):
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"""Handle ACK packets from the client."""
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namespace = namespace or '/'
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self.logger.info('received ack from %s [%s]', sid, namespace)
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await self.manager.trigger_callback(sid, namespace, id, data)
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async def _trigger_event(self, event, namespace, *args):
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"""Invoke an application event handler."""
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# first see if we have an explicit handler for the event
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if namespace in self.handlers and event in self.handlers[namespace]:
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if asyncio.iscoroutinefunction(self.handlers[namespace][event]) \
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is True:
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try:
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ret = await self.handlers[namespace][event](*args)
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except asyncio.CancelledError: # pragma: no cover
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ret = None
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else:
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ret = self.handlers[namespace][event](*args)
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return ret
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# or else, forward the event to a namepsace handler if one exists
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elif namespace in self.namespace_handlers:
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return await self.namespace_handlers[namespace].trigger_event(
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event, *args)
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|
|
async def _handle_eio_connect(self, sid, environ):
|
|
"""Handle the Engine.IO connection event."""
|
|
if not self.manager_initialized:
|
|
self.manager_initialized = True
|
|
self.manager.initialize()
|
|
self.environ[sid] = environ
|
|
return await self._handle_connect(sid, '/')
|
|
|
|
async def _handle_eio_message(self, sid, data):
|
|
"""Dispatch Engine.IO messages."""
|
|
if sid in self._binary_packet:
|
|
pkt = self._binary_packet[sid]
|
|
if pkt.add_attachment(data):
|
|
del self._binary_packet[sid]
|
|
if pkt.packet_type == packet.BINARY_EVENT:
|
|
await self._handle_event(sid, pkt.namespace, pkt.id,
|
|
pkt.data)
|
|
else:
|
|
await self._handle_ack(sid, pkt.namespace, pkt.id,
|
|
pkt.data)
|
|
else:
|
|
pkt = packet.Packet(encoded_packet=data)
|
|
if pkt.packet_type == packet.CONNECT:
|
|
await self._handle_connect(sid, pkt.namespace)
|
|
elif pkt.packet_type == packet.DISCONNECT:
|
|
await self._handle_disconnect(sid, pkt.namespace)
|
|
elif pkt.packet_type == packet.EVENT:
|
|
await self._handle_event(sid, pkt.namespace, pkt.id, pkt.data)
|
|
elif pkt.packet_type == packet.ACK:
|
|
await self._handle_ack(sid, pkt.namespace, pkt.id, pkt.data)
|
|
elif pkt.packet_type == packet.BINARY_EVENT or \
|
|
pkt.packet_type == packet.BINARY_ACK:
|
|
self._binary_packet[sid] = pkt
|
|
elif pkt.packet_type == packet.ERROR:
|
|
raise ValueError('Unexpected ERROR packet.')
|
|
else:
|
|
raise ValueError('Unknown packet type.')
|
|
|
|
async def _handle_eio_disconnect(self, sid):
|
|
"""Handle Engine.IO disconnect event."""
|
|
await self._handle_disconnect(sid, '/')
|
|
if sid in self.environ:
|
|
del self.environ[sid]
|
|
|
|
def _engineio_server_class(self):
|
|
return engineio.AsyncServer
|