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602 lines
30 KiB
602 lines
30 KiB
import asyncio
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import engineio
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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.
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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``. Note that fatal
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errors are logged even when ``logger`` is ``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 for a client are
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executed in separate threads. To run handlers for a
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client synchronously, set to ``False``. The default
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is ``True``.
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:param always_connect: When set to ``False``, new connections are
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provisory until the connect handler returns
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something other than ``False``, at which point they
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are accepted. When set to ``True``, connections are
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immediately accepted, and then if the connect
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handler returns ``False`` a disconnect is issued.
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Set to ``True`` if you need to emit events from the
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connect handler and your client is confused when it
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receives events before the connection acceptance.
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In any other case use the default of ``False``.
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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 "threading",
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"eventlet", "gevent" and "gevent_uwsgi". If this
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argument is not given, "eventlet" is tried first, then
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"gevent_uwsgi", then "gevent", and finally "threading".
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The first async mode that has all its dependencies
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installed is then one that is chosen.
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:param ping_interval: The interval in seconds at which the server pings
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the client. The default is 25 seconds. For advanced
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control, a two element tuple can be given, where
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the first number is the ping interval and the second
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is a grace period added by the server.
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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. The default
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is 5 seconds.
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:param max_http_buffer_size: The maximum size of a message when using the
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polling transport. The default is 1,000,000
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bytes.
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:param allow_upgrades: Whether to allow transport upgrades or not. The
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default is ``True``.
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:param http_compression: Whether to compress packages when using the
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polling transport. The default is ``True``.
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:param compression_threshold: Only compress messages when their byte size
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is greater than this value. The default is
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1024 bytes.
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:param cookie: If set to a string, it is the name of the HTTP cookie the
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server sends back tot he client containing the client
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session id. If set to a dictionary, the ``'name'`` key
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contains the cookie name and other keys define cookie
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attributes, where the value of each attribute can be a
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string, a callable with no arguments, or a boolean. If set
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to ``None`` (the default), a cookie is not sent to the
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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. The default is
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``True``.
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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``. The default is ``False``. Note that
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fatal errors are logged even when
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``engineio_logger`` is ``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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json=json, 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``. To send
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multiple arguments, use a tuple where each element is of
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one of the types indicated above.
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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, to any
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any custom room created by the application to address all
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the clients in that room, or to a list of custom room
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names. If this argument is omitted the event is broadcasted
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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 not designed to be used concurrently. If multiple
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tasks are emitting at the same time to the same client connection, then
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messages composed of multiple packets may end up being sent in an
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incorrect sequence. Use standard concurrency solutions (such as a Lock
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object) to prevent this situation.
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Note 2: 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``. To send
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multiple arguments, use a tuple where each element is of
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one of the types indicated above.
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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, to any
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any custom room created by the application to address all
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the clients in that room, or to a list of custom room
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names. If this argument is omitted the event is broadcasted
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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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This method issues an emit with a callback and waits for the callback
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to be invoked before returning. If the callback isn't invoked before
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the timeout, then a ``TimeoutError`` exception is raised. If the
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Socket.IO connection drops during the wait, this method still waits
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until the specified timeout.
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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``. To send
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multiple arguments, use a tuple where each element is of
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one of the types indicated above.
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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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Note: this method is not designed to be used concurrently. If multiple
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tasks are emitting at the same time to the same client connection, then
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messages composed of multiple packets may end up being sent in an
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incorrect sequence. Use standard concurrency solutions (such as a Lock
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object) to prevent this situation.
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Note 2: this method is a coroutine.
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"""
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if to is None and sid is None:
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raise ValueError('Cannot use call() to broadcast.')
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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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raise exceptions.TimeoutError() from 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_sid = self.manager.eio_sid_from_sid(sid, namespace)
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eio_session = await self.eio.get_session(eio_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_sid = self.manager.eio_sid_from_sid(sid, namespace)
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eio_session = await self.eio.get_session(eio_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, ignore_queue=False):
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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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:param ignore_queue: Only used when a message queue is configured. If
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set to ``True``, the disconnect is processed
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locally, without broadcasting on the queue. It is
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recommended to always leave this parameter with
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its default 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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if ignore_queue:
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delete_it = self.manager.is_connected(sid, namespace)
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else:
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delete_it = await self.manager.can_disconnect(sid, namespace)
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if delete_it:
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self.logger.info('Disconnecting %s [%s]', sid, namespace)
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eio_sid = self.manager.pre_disconnect(sid, namespace=namespace)
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await self._send_packet(eio_sid, self.packet_class(
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packet.DISCONNECT, 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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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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"""
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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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elif data is not None:
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data = [data]
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else:
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data = []
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await self._send_packet(sid, self.packet_class(
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packet.EVENT, namespace=namespace, data=[event] + data, id=id))
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async def _send_packet(self, eio_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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for ep in encoded_packet:
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await self.eio.send(eio_sid, ep)
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else:
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await self.eio.send(eio_sid, encoded_packet)
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async def _handle_connect(self, eio_sid, namespace, data):
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"""Handle a client connection request."""
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namespace = namespace or '/'
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sid = self.manager.connect(eio_sid, namespace)
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if self.always_connect:
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await self._send_packet(eio_sid, self.packet_class(
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packet.CONNECT, {'sid': sid}, namespace=namespace))
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fail_reason = exceptions.ConnectionRefusedError().error_args
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try:
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if data:
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success = await self._trigger_event(
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'connect', namespace, sid, self.environ[eio_sid], data)
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else:
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try:
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success = await self._trigger_event(
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'connect', namespace, sid, self.environ[eio_sid])
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except TypeError:
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success = await self._trigger_event(
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'connect', namespace, sid, self.environ[eio_sid], None)
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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(eio_sid, self.packet_class(
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packet.DISCONNECT, data=fail_reason, namespace=namespace))
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else:
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await self._send_packet(eio_sid, self.packet_class(
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|
packet.CONNECT_ERROR, data=fail_reason,
|
|
namespace=namespace))
|
|
self.manager.disconnect(sid, namespace)
|
|
elif not self.always_connect:
|
|
await self._send_packet(eio_sid, self.packet_class(
|
|
packet.CONNECT, {'sid': sid}, namespace=namespace))
|
|
|
|
async def _handle_disconnect(self, eio_sid, namespace):
|
|
"""Handle a client disconnect."""
|
|
namespace = namespace or '/'
|
|
sid = self.manager.sid_from_eio_sid(eio_sid, namespace)
|
|
if not self.manager.is_connected(sid, namespace): # pragma: no cover
|
|
return
|
|
self.manager.pre_disconnect(sid, namespace=namespace)
|
|
await self._trigger_event('disconnect', namespace, sid)
|
|
self.manager.disconnect(sid, namespace)
|
|
|
|
async def _handle_event(self, eio_sid, namespace, id, data):
|
|
"""Handle an incoming client event."""
|
|
namespace = namespace or '/'
|
|
sid = self.manager.sid_from_eio_sid(eio_sid, namespace)
|
|
self.logger.info('received event "%s" from %s [%s]', data[0], sid,
|
|
namespace)
|
|
if not self.manager.is_connected(sid, namespace):
|
|
self.logger.warning('%s is not connected to namespace %s',
|
|
sid, namespace)
|
|
return
|
|
if self.async_handlers:
|
|
self.start_background_task(self._handle_event_internal, self, sid,
|
|
eio_sid, data, namespace, id)
|
|
else:
|
|
await self._handle_event_internal(self, sid, eio_sid, data,
|
|
namespace, id)
|
|
|
|
async def _handle_event_internal(self, server, sid, eio_sid, data,
|
|
namespace, id):
|
|
r = await server._trigger_event(data[0], namespace, sid, *data[1:])
|
|
if id is not None:
|
|
# send ACK packet with the response returned by the handler
|
|
# tuples are expanded as multiple arguments
|
|
if r is None:
|
|
data = []
|
|
elif isinstance(r, tuple):
|
|
data = list(r)
|
|
else:
|
|
data = [r]
|
|
await server._send_packet(eio_sid, self.packet_class(
|
|
packet.ACK, namespace=namespace, id=id, data=data))
|
|
|
|
async def _handle_ack(self, eio_sid, namespace, id, data):
|
|
"""Handle ACK packets from the client."""
|
|
namespace = namespace or '/'
|
|
sid = self.manager.sid_from_eio_sid(eio_sid, namespace)
|
|
self.logger.info('received ack from %s [%s]', sid, namespace)
|
|
await self.manager.trigger_callback(sid, id, data)
|
|
|
|
async def _trigger_event(self, event, namespace, *args):
|
|
"""Invoke an application event handler."""
|
|
# first see if we have an explicit handler for the event
|
|
if namespace in self.handlers:
|
|
handler = None
|
|
if event in self.handlers[namespace]:
|
|
handler = self.handlers[namespace][event]
|
|
elif event not in self.reserved_events and \
|
|
'*' in self.handlers[namespace]:
|
|
handler = self.handlers[namespace]['*']
|
|
args = (event, *args)
|
|
if handler:
|
|
if asyncio.iscoroutinefunction(handler):
|
|
try:
|
|
ret = await handler(*args)
|
|
except asyncio.CancelledError: # pragma: no cover
|
|
ret = None
|
|
else:
|
|
ret = handler(*args)
|
|
return ret
|
|
|
|
# or else, forward the event to a namepsace handler if one exists
|
|
elif namespace in self.namespace_handlers:
|
|
return await self.namespace_handlers[namespace].trigger_event(
|
|
event, *args)
|
|
|
|
async def _handle_eio_connect(self, eio_sid, environ):
|
|
"""Handle the Engine.IO connection event."""
|
|
if not self.manager_initialized:
|
|
self.manager_initialized = True
|
|
self.manager.initialize()
|
|
self.environ[eio_sid] = environ
|
|
|
|
async def _handle_eio_message(self, eio_sid, data):
|
|
"""Dispatch Engine.IO messages."""
|
|
if eio_sid in self._binary_packet:
|
|
pkt = self._binary_packet[eio_sid]
|
|
if pkt.add_attachment(data):
|
|
del self._binary_packet[eio_sid]
|
|
if pkt.packet_type == packet.BINARY_EVENT:
|
|
await self._handle_event(eio_sid, pkt.namespace, pkt.id,
|
|
pkt.data)
|
|
else:
|
|
await self._handle_ack(eio_sid, pkt.namespace, pkt.id,
|
|
pkt.data)
|
|
else:
|
|
pkt = self.packet_class(encoded_packet=data)
|
|
if pkt.packet_type == packet.CONNECT:
|
|
await self._handle_connect(eio_sid, pkt.namespace, pkt.data)
|
|
elif pkt.packet_type == packet.DISCONNECT:
|
|
await self._handle_disconnect(eio_sid, pkt.namespace)
|
|
elif pkt.packet_type == packet.EVENT:
|
|
await self._handle_event(eio_sid, pkt.namespace, pkt.id,
|
|
pkt.data)
|
|
elif pkt.packet_type == packet.ACK:
|
|
await self._handle_ack(eio_sid, pkt.namespace, pkt.id,
|
|
pkt.data)
|
|
elif pkt.packet_type == packet.BINARY_EVENT or \
|
|
pkt.packet_type == packet.BINARY_ACK:
|
|
self._binary_packet[eio_sid] = pkt
|
|
elif pkt.packet_type == packet.CONNECT_ERROR:
|
|
raise ValueError('Unexpected CONNECT_ERROR packet.')
|
|
else:
|
|
raise ValueError('Unknown packet type.')
|
|
|
|
async def _handle_eio_disconnect(self, eio_sid):
|
|
"""Handle Engine.IO disconnect event."""
|
|
for n in list(self.manager.get_namespaces()).copy():
|
|
await self._handle_disconnect(eio_sid, n)
|
|
if eio_sid in self.environ:
|
|
del self.environ[eio_sid]
|
|
|
|
def _engineio_server_class(self):
|
|
return engineio.AsyncServer
|