mirror of
https://github.com/morpheus65535/bazarr
synced 2024-12-25 17:17:12 +00:00
620 lines
26 KiB
Python
620 lines
26 KiB
Python
import itertools
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import logging
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import random
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import signal
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import engineio
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import six
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from . import exceptions
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from . import namespace
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from . import packet
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default_logger = logging.getLogger('socketio.client')
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reconnecting_clients = []
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def signal_handler(sig, frame): # pragma: no cover
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"""SIGINT handler.
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Notify any clients that are in a reconnect loop to abort. Other
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disconnection tasks are handled at the engine.io level.
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"""
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for client in reconnecting_clients[:]:
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client._reconnect_abort.set()
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return original_signal_handler(sig, frame)
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original_signal_handler = signal.signal(signal.SIGINT, signal_handler)
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class Client(object):
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"""A Socket.IO client.
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This class implements a fully compliant Socket.IO web client with support
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for websocket and long-polling transports.
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:param reconnection: ``True`` if the client should automatically attempt to
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reconnect to the server after an interruption, or
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``False`` to not reconnect. The default is ``True``.
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:param reconnection_attempts: How many reconnection attempts to issue
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before giving up, or 0 for infinity attempts.
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The default is 0.
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:param reconnection_delay: How long to wait in seconds before the first
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reconnection attempt. Each successive attempt
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doubles this delay.
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:param reconnection_delay_max: The maximum delay between reconnection
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attempts.
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:param randomization_factor: Randomization amount for each delay between
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reconnection attempts. The default is 0.5,
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which means that each delay is randomly
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adjusted by +/- 50%.
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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``. The default is
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``False``.
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:param binary: ``True`` to support binary payloads, ``False`` to treat all
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payloads as text. On Python 2, if this is set to ``True``,
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``unicode`` values are treated as text, and ``str`` and
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``bytes`` values are treated as binary. This option has no
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effect on Python 3, where text and binary payloads are
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always automatically discovered.
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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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The Engine.IO configuration supports the following settings:
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:param request_timeout: A timeout in seconds for requests. The default is
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5 seconds.
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:param ssl_verify: ``True`` to verify SSL certificates, or ``False`` to
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skip SSL certificate verification, allowing
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connections to servers with self signed certificates.
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The 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``.
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"""
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def __init__(self, reconnection=True, reconnection_attempts=0,
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reconnection_delay=1, reconnection_delay_max=5,
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randomization_factor=0.5, logger=False, binary=False,
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json=None, **kwargs):
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self.reconnection = reconnection
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self.reconnection_attempts = reconnection_attempts
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self.reconnection_delay = reconnection_delay
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self.reconnection_delay_max = reconnection_delay_max
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self.randomization_factor = randomization_factor
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self.binary = binary
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engineio_options = kwargs
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engineio_logger = engineio_options.pop('engineio_logger', None)
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if engineio_logger is not None:
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engineio_options['logger'] = engineio_logger
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if json is not None:
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packet.Packet.json = json
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engineio_options['json'] = json
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self.eio = self._engineio_client_class()(**engineio_options)
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self.eio.on('connect', self._handle_eio_connect)
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self.eio.on('message', self._handle_eio_message)
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self.eio.on('disconnect', self._handle_eio_disconnect)
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if not isinstance(logger, bool):
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self.logger = logger
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else:
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self.logger = default_logger
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if not logging.root.handlers and \
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self.logger.level == logging.NOTSET:
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if logger:
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self.logger.setLevel(logging.INFO)
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else:
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self.logger.setLevel(logging.ERROR)
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self.logger.addHandler(logging.StreamHandler())
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self.connection_url = None
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self.connection_headers = None
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self.connection_transports = None
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self.connection_namespaces = None
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self.socketio_path = None
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self.sid = None
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self.connected = False
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self.namespaces = []
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self.handlers = {}
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self.namespace_handlers = {}
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self.callbacks = {}
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self._binary_packet = None
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self._reconnect_task = None
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self._reconnect_abort = self.eio.create_event()
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def is_asyncio_based(self):
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return False
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def on(self, event, handler=None, namespace=None):
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"""Register an event handler.
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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 handler: The function that should be invoked to handle the
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event. When this parameter is not given, the method
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acts as a decorator for the handler function.
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:param namespace: The Socket.IO namespace for the event. If this
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argument is omitted the handler is associated with
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the default namespace.
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Example usage::
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# as a decorator:
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@sio.on('connect')
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def connect_handler():
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print('Connected!')
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# as a method:
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def message_handler(msg):
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print('Received message: ', msg)
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sio.send( 'response')
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sio.on('message', message_handler)
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The ``'connect'`` event handler receives no arguments. The
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``'message'`` handler and handlers for custom event names receive the
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message payload as only argument. Any values returned from a message
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handler will be passed to the client's acknowledgement callback
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function if it exists. The ``'disconnect'`` handler does not take
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arguments.
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"""
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namespace = namespace or '/'
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def set_handler(handler):
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if namespace not in self.handlers:
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self.handlers[namespace] = {}
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self.handlers[namespace][event] = handler
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return handler
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if handler is None:
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return set_handler
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set_handler(handler)
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def event(self, *args, **kwargs):
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"""Decorator to register an event handler.
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This is a simplified version of the ``on()`` method that takes the
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event name from the decorated function.
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Example usage::
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@sio.event
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def my_event(data):
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print('Received data: ', data)
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The above example is equivalent to::
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@sio.on('my_event')
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def my_event(data):
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print('Received data: ', data)
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A custom namespace can be given as an argument to the decorator::
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@sio.event(namespace='/test')
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def my_event(data):
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print('Received data: ', data)
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"""
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if len(args) == 1 and len(kwargs) == 0 and callable(args[0]):
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# the decorator was invoked without arguments
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# args[0] is the decorated function
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return self.on(args[0].__name__)(args[0])
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else:
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# the decorator was invoked with arguments
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def set_handler(handler):
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return self.on(handler.__name__, *args, **kwargs)(handler)
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return set_handler
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def register_namespace(self, namespace_handler):
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"""Register a namespace handler object.
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:param namespace_handler: An instance of a :class:`Namespace`
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subclass that handles all the event traffic
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for a namespace.
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"""
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if not isinstance(namespace_handler, namespace.ClientNamespace):
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raise ValueError('Not a namespace instance')
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if self.is_asyncio_based() != namespace_handler.is_asyncio_based():
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raise ValueError('Not a valid namespace class for this client')
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namespace_handler._set_client(self)
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self.namespace_handlers[namespace_handler.namespace] = \
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namespace_handler
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def connect(self, url, headers={}, transports=None,
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namespaces=None, socketio_path='socket.io'):
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"""Connect to a Socket.IO server.
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:param url: The URL of the Socket.IO server. It can include custom
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query string parameters if required by the server.
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:param headers: A dictionary with custom headers to send with the
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connection request.
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:param transports: The list of allowed transports. Valid transports
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are ``'polling'`` and ``'websocket'``. If not
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given, the polling transport is connected first,
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then an upgrade to websocket is attempted.
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:param namespaces: The list of custom namespaces to connect, in
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addition to the default namespace. If not given,
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the namespace list is obtained from the registered
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event handlers.
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:param socketio_path: The endpoint where the Socket.IO server is
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installed. The default value is appropriate for
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most cases.
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Example usage::
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sio = socketio.Client()
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sio.connect('http://localhost:5000')
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"""
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self.connection_url = url
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self.connection_headers = headers
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self.connection_transports = transports
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self.connection_namespaces = namespaces
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self.socketio_path = socketio_path
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if namespaces is None:
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namespaces = set(self.handlers.keys()).union(
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set(self.namespace_handlers.keys()))
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elif isinstance(namespaces, six.string_types):
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namespaces = [namespaces]
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self.connection_namespaces = namespaces
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self.namespaces = [n for n in namespaces if n != '/']
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try:
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self.eio.connect(url, headers=headers, transports=transports,
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engineio_path=socketio_path)
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except engineio.exceptions.ConnectionError as exc:
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six.raise_from(exceptions.ConnectionError(exc.args[0]), None)
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self.connected = True
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def wait(self):
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"""Wait until the connection with the server ends.
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Client applications can use this function to block the main thread
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during the life of the connection.
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"""
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while True:
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self.eio.wait()
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self.sleep(1) # give the reconnect task time to start up
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if not self._reconnect_task:
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break
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self._reconnect_task.join()
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if self.eio.state != 'connected':
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break
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def emit(self, event, data=None, namespace=None, callback=None):
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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 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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"""
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namespace = namespace or '/'
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if namespace != '/' and namespace not in self.namespaces:
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raise exceptions.BadNamespaceError(
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namespace + ' is not a connected namespace.')
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self.logger.info('Emitting event "%s" [%s]', event, namespace)
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if callback is not None:
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id = self._generate_ack_id(namespace, callback)
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else:
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id = None
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if six.PY2 and not self.binary:
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binary = False # pragma: nocover
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else:
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binary = None
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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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self._send_packet(packet.Packet(packet.EVENT, namespace=namespace,
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data=[event] + data, id=id,
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binary=binary))
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def send(self, data, namespace=None, callback=None):
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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 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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"""
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self.emit('message', data=data, namespace=namespace,
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callback=callback)
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def call(self, event, data=None, namespace=None, timeout=60):
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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 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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"""
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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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self.emit(event, data=data, namespace=namespace,
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callback=event_callback)
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if not callback_event.wait(timeout=timeout):
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raise exceptions.TimeoutError()
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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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def disconnect(self):
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"""Disconnect from the server."""
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# here we just request the disconnection
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# later in _handle_eio_disconnect we invoke the disconnect handler
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for n in self.namespaces:
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self._send_packet(packet.Packet(packet.DISCONNECT, namespace=n))
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self._send_packet(packet.Packet(
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packet.DISCONNECT, namespace='/'))
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self.connected = False
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self.eio.disconnect(abort=True)
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def transport(self):
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"""Return the name of the transport used by the client.
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The two possible values returned by this function are ``'polling'``
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and ``'websocket'``.
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"""
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return self.eio.transport()
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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.
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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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This function returns an object compatible with the `Thread` class in
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the Python standard library. The `start()` method on this object is
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already called by this function.
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"""
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return self.eio.start_background_task(target, *args, **kwargs)
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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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"""
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return self.eio.sleep(seconds)
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def _send_packet(self, pkt):
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"""Send a Socket.IO packet to the server."""
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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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self.eio.send(ep, binary=binary)
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binary = True
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else:
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self.eio.send(encoded_packet, binary=False)
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def _generate_ack_id(self, namespace, callback):
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"""Generate a unique identifier for an ACK packet."""
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namespace = namespace or '/'
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if namespace not in self.callbacks:
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self.callbacks[namespace] = {0: itertools.count(1)}
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id = six.next(self.callbacks[namespace][0])
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self.callbacks[namespace][id] = callback
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return id
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def _handle_connect(self, namespace):
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namespace = namespace or '/'
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self.logger.info('Namespace {} is connected'.format(namespace))
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self._trigger_event('connect', namespace=namespace)
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if namespace == '/':
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for n in self.namespaces:
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self._send_packet(packet.Packet(packet.CONNECT, namespace=n))
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elif namespace not in self.namespaces:
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self.namespaces.append(namespace)
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def _handle_disconnect(self, namespace):
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if not self.connected:
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return
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namespace = namespace or '/'
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if namespace == '/':
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for n in self.namespaces:
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self._trigger_event('disconnect', namespace=n)
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self.namespaces = []
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self._trigger_event('disconnect', namespace=namespace)
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if namespace in self.namespaces:
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self.namespaces.remove(namespace)
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if namespace == '/':
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self.connected = False
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def _handle_event(self, namespace, id, data):
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namespace = namespace or '/'
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self.logger.info('Received event "%s" [%s]', data[0], namespace)
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r = self._trigger_event(data[0], namespace, *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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if six.PY2 and not self.binary:
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binary = False # pragma: nocover
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else:
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binary = None
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self._send_packet(packet.Packet(packet.ACK, namespace=namespace,
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id=id, data=data, binary=binary))
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def _handle_ack(self, namespace, id, data):
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namespace = namespace or '/'
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self.logger.info('Received ack [%s]', namespace)
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callback = None
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try:
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callback = self.callbacks[namespace][id]
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except KeyError:
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# if we get an unknown callback we just ignore it
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self.logger.warning('Unknown callback received, ignoring.')
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else:
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del self.callbacks[namespace][id]
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if callback is not None:
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callback(*data)
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def _handle_error(self, namespace, data):
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namespace = namespace or '/'
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self.logger.info('Connection to namespace {} was rejected'.format(
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namespace))
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if data is None:
|
|
data = tuple()
|
|
elif not isinstance(data, (tuple, list)):
|
|
data = (data,)
|
|
self._trigger_event('connect_error', namespace, *data)
|
|
if namespace in self.namespaces:
|
|
self.namespaces.remove(namespace)
|
|
if namespace == '/':
|
|
self.namespaces = []
|
|
self.connected = False
|
|
|
|
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 and event in self.handlers[namespace]:
|
|
return self.handlers[namespace][event](*args)
|
|
|
|
# or else, forward the event to a namespace handler if one exists
|
|
elif namespace in self.namespace_handlers:
|
|
return self.namespace_handlers[namespace].trigger_event(
|
|
event, *args)
|
|
|
|
def _handle_reconnect(self):
|
|
self._reconnect_abort.clear()
|
|
reconnecting_clients.append(self)
|
|
attempt_count = 0
|
|
current_delay = self.reconnection_delay
|
|
while True:
|
|
delay = current_delay
|
|
current_delay *= 2
|
|
if delay > self.reconnection_delay_max:
|
|
delay = self.reconnection_delay_max
|
|
delay += self.randomization_factor * (2 * random.random() - 1)
|
|
self.logger.info(
|
|
'Connection failed, new attempt in {:.02f} seconds'.format(
|
|
delay))
|
|
if self._reconnect_abort.wait(delay):
|
|
self.logger.info('Reconnect task aborted')
|
|
break
|
|
attempt_count += 1
|
|
try:
|
|
self.connect(self.connection_url,
|
|
headers=self.connection_headers,
|
|
transports=self.connection_transports,
|
|
namespaces=self.connection_namespaces,
|
|
socketio_path=self.socketio_path)
|
|
except (exceptions.ConnectionError, ValueError):
|
|
pass
|
|
else:
|
|
self.logger.info('Reconnection successful')
|
|
self._reconnect_task = None
|
|
break
|
|
if self.reconnection_attempts and \
|
|
attempt_count >= self.reconnection_attempts:
|
|
self.logger.info(
|
|
'Maximum reconnection attempts reached, giving up')
|
|
break
|
|
reconnecting_clients.remove(self)
|
|
|
|
def _handle_eio_connect(self):
|
|
"""Handle the Engine.IO connection event."""
|
|
self.logger.info('Engine.IO connection established')
|
|
self.sid = self.eio.sid
|
|
|
|
def _handle_eio_message(self, data):
|
|
"""Dispatch Engine.IO messages."""
|
|
if self._binary_packet:
|
|
pkt = self._binary_packet
|
|
if pkt.add_attachment(data):
|
|
self._binary_packet = None
|
|
if pkt.packet_type == packet.BINARY_EVENT:
|
|
self._handle_event(pkt.namespace, pkt.id, pkt.data)
|
|
else:
|
|
self._handle_ack(pkt.namespace, pkt.id, pkt.data)
|
|
else:
|
|
pkt = packet.Packet(encoded_packet=data)
|
|
if pkt.packet_type == packet.CONNECT:
|
|
self._handle_connect(pkt.namespace)
|
|
elif pkt.packet_type == packet.DISCONNECT:
|
|
self._handle_disconnect(pkt.namespace)
|
|
elif pkt.packet_type == packet.EVENT:
|
|
self._handle_event(pkt.namespace, pkt.id, pkt.data)
|
|
elif pkt.packet_type == packet.ACK:
|
|
self._handle_ack(pkt.namespace, pkt.id, pkt.data)
|
|
elif pkt.packet_type == packet.BINARY_EVENT or \
|
|
pkt.packet_type == packet.BINARY_ACK:
|
|
self._binary_packet = pkt
|
|
elif pkt.packet_type == packet.ERROR:
|
|
self._handle_error(pkt.namespace, pkt.data)
|
|
else:
|
|
raise ValueError('Unknown packet type.')
|
|
|
|
def _handle_eio_disconnect(self):
|
|
"""Handle the Engine.IO disconnection event."""
|
|
self.logger.info('Engine.IO connection dropped')
|
|
if self.connected:
|
|
for n in self.namespaces:
|
|
self._trigger_event('disconnect', namespace=n)
|
|
self._trigger_event('disconnect', namespace='/')
|
|
self.namespaces = []
|
|
self.connected = False
|
|
self.callbacks = {}
|
|
self._binary_packet = None
|
|
self.sid = None
|
|
if self.eio.state == 'connected' and self.reconnection:
|
|
self._reconnect_task = self.start_background_task(
|
|
self._handle_reconnect)
|
|
|
|
def _engineio_client_class(self):
|
|
return engineio.Client
|