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681 lines
27 KiB
681 lines
27 KiB
import logging
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try:
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import queue
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except ImportError: # pragma: no cover
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import Queue as queue
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import signal
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import ssl
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import threading
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import time
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import six
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from six.moves import urllib
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try:
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import requests
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except ImportError: # pragma: no cover
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requests = None
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try:
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import websocket
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except ImportError: # pragma: no cover
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websocket = None
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from . import exceptions
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from . import packet
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from . import payload
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default_logger = logging.getLogger('engineio.client')
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connected_clients = []
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if six.PY2: # pragma: no cover
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ConnectionError = OSError
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def signal_handler(sig, frame):
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"""SIGINT handler.
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Disconnect all active clients and then invoke the original signal handler.
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"""
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for client in connected_clients[:]:
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if client.is_asyncio_based():
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client.start_background_task(client.disconnect, abort=True)
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else:
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client.disconnect(abort=True)
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if callable(original_signal_handler):
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return original_signal_handler(sig, frame)
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else: # pragma: no cover
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# Handle case where no original SIGINT handler was present.
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return signal.default_int_handler(sig, frame)
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original_signal_handler = None
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class Client(object):
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"""An Engine.IO client.
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This class implements a fully compliant Engine.IO web client with support
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for websocket and long-polling transports.
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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 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 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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"""
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event_names = ['connect', 'disconnect', 'message']
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def __init__(self,
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logger=False,
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json=None,
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request_timeout=5,
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ssl_verify=True):
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global original_signal_handler
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if original_signal_handler is None:
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original_signal_handler = signal.signal(signal.SIGINT,
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signal_handler)
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self.handlers = {}
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self.base_url = None
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self.transports = None
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self.current_transport = None
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self.sid = None
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self.upgrades = None
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self.ping_interval = None
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self.ping_timeout = None
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self.pong_received = True
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self.http = None
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self.ws = None
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self.read_loop_task = None
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self.write_loop_task = None
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self.ping_loop_task = None
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self.ping_loop_event = None
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self.queue = None
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self.state = 'disconnected'
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self.ssl_verify = ssl_verify
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if json is not None:
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packet.Packet.json = json
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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.request_timeout = request_timeout
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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):
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"""Register an event handler.
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:param event: The event name. Can be ``'connect'``, ``'message'`` or
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``'disconnect'``.
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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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Example usage::
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# as a decorator:
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@eio.on('connect')
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def connect_handler():
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print('Connection request')
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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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eio.send('response')
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eio.on('message', message_handler)
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"""
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if event not in self.event_names:
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raise ValueError('Invalid event')
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def set_handler(handler):
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self.handlers[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 connect(self, url, headers={}, transports=None,
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engineio_path='engine.io'):
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"""Connect to an Engine.IO server.
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:param url: The URL of the Engine.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 engineio_path: The endpoint where the Engine.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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eio = engineio.Client()
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eio.connect('http://localhost:5000')
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"""
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if self.state != 'disconnected':
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raise ValueError('Client is not in a disconnected state')
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valid_transports = ['polling', 'websocket']
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if transports is not None:
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if isinstance(transports, six.string_types):
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transports = [transports]
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transports = [transport for transport in transports
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if transport in valid_transports]
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if not transports:
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raise ValueError('No valid transports provided')
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self.transports = transports or valid_transports
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self.queue = self.create_queue()
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return getattr(self, '_connect_' + self.transports[0])(
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url, headers, engineio_path)
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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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if self.read_loop_task:
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self.read_loop_task.join()
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def send(self, data, binary=None):
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"""Send a message to a client.
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:param data: The data to send to the client. Data can be of type
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``str``, ``bytes``, ``list`` or ``dict``. If a ``list``
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or ``dict``, the data will be serialized as JSON.
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:param binary: ``True`` to send packet as binary, ``False`` to send
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as text. If not given, unicode (Python 2) and str
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(Python 3) are sent as text, and str (Python 2) and
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bytes (Python 3) are sent as binary.
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"""
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self._send_packet(packet.Packet(packet.MESSAGE, data=data,
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binary=binary))
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def disconnect(self, abort=False):
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"""Disconnect from the server.
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:param abort: If set to ``True``, do not wait for background tasks
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associated with the connection to end.
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"""
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if self.state == 'connected':
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self._send_packet(packet.Packet(packet.CLOSE))
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self.queue.put(None)
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self.state = 'disconnecting'
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self._trigger_event('disconnect', run_async=False)
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if self.current_transport == 'websocket':
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self.ws.close()
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if not abort:
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self.read_loop_task.join()
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self.state = 'disconnected'
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try:
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connected_clients.remove(self)
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except ValueError: # pragma: no cover
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pass
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self._reset()
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def transport(self):
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"""Return the name of the transport currently in use.
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The possible values returned by this function are ``'polling'`` and
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``'websocket'``.
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"""
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return self.current_transport
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def start_background_task(self, target, *args, **kwargs):
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"""Start a background task.
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This is a utility function that applications can use to start a
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background task.
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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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th = threading.Thread(target=target, args=args, kwargs=kwargs)
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th.start()
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return th
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def sleep(self, seconds=0):
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"""Sleep for the requested amount of time."""
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return time.sleep(seconds)
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def create_queue(self, *args, **kwargs):
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"""Create a queue object."""
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q = queue.Queue(*args, **kwargs)
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q.Empty = queue.Empty
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return q
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def create_event(self, *args, **kwargs):
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"""Create an event object."""
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return threading.Event(*args, **kwargs)
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def _reset(self):
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self.state = 'disconnected'
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self.sid = None
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def _connect_polling(self, url, headers, engineio_path):
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"""Establish a long-polling connection to the Engine.IO server."""
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if requests is None: # pragma: no cover
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# not installed
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self.logger.error('requests package is not installed -- cannot '
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'send HTTP requests!')
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return
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self.base_url = self._get_engineio_url(url, engineio_path, 'polling')
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self.logger.info('Attempting polling connection to ' + self.base_url)
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r = self._send_request(
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'GET', self.base_url + self._get_url_timestamp(), headers=headers,
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timeout=self.request_timeout)
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if r is None:
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self._reset()
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raise exceptions.ConnectionError(
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'Connection refused by the server')
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if r.status_code < 200 or r.status_code >= 300:
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raise exceptions.ConnectionError(
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'Unexpected status code {} in server response'.format(
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r.status_code))
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try:
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p = payload.Payload(encoded_payload=r.content)
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except ValueError:
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six.raise_from(exceptions.ConnectionError(
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'Unexpected response from server'), None)
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open_packet = p.packets[0]
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if open_packet.packet_type != packet.OPEN:
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raise exceptions.ConnectionError(
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'OPEN packet not returned by server')
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self.logger.info(
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'Polling connection accepted with ' + str(open_packet.data))
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self.sid = open_packet.data['sid']
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self.upgrades = open_packet.data['upgrades']
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self.ping_interval = open_packet.data['pingInterval'] / 1000.0
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self.ping_timeout = open_packet.data['pingTimeout'] / 1000.0
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self.current_transport = 'polling'
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self.base_url += '&sid=' + self.sid
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self.state = 'connected'
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connected_clients.append(self)
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self._trigger_event('connect', run_async=False)
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for pkt in p.packets[1:]:
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self._receive_packet(pkt)
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if 'websocket' in self.upgrades and 'websocket' in self.transports:
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# attempt to upgrade to websocket
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if self._connect_websocket(url, headers, engineio_path):
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# upgrade to websocket succeeded, we're done here
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return
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# start background tasks associated with this client
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self.ping_loop_task = self.start_background_task(self._ping_loop)
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self.write_loop_task = self.start_background_task(self._write_loop)
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self.read_loop_task = self.start_background_task(
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self._read_loop_polling)
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def _connect_websocket(self, url, headers, engineio_path):
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"""Establish or upgrade to a WebSocket connection with the server."""
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if websocket is None: # pragma: no cover
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# not installed
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self.logger.warning('websocket-client package not installed, only '
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'polling transport is available')
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return False
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websocket_url = self._get_engineio_url(url, engineio_path, 'websocket')
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if self.sid:
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self.logger.info(
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'Attempting WebSocket upgrade to ' + websocket_url)
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upgrade = True
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websocket_url += '&sid=' + self.sid
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else:
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upgrade = False
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self.base_url = websocket_url
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self.logger.info(
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'Attempting WebSocket connection to ' + websocket_url)
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# get the cookies from the long-polling connection so that they can
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# also be sent the the WebSocket route
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cookies = None
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if self.http:
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cookies = '; '.join(["{}={}".format(cookie.name, cookie.value)
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for cookie in self.http.cookies])
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try:
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if not self.ssl_verify:
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ws = websocket.create_connection(
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websocket_url + self._get_url_timestamp(), header=headers,
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cookie=cookies, sslopt={"cert_reqs": ssl.CERT_NONE})
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else:
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ws = websocket.create_connection(
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websocket_url + self._get_url_timestamp(), header=headers,
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cookie=cookies)
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except (ConnectionError, IOError, websocket.WebSocketException):
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if upgrade:
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self.logger.warning(
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'WebSocket upgrade failed: connection error')
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return False
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else:
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raise exceptions.ConnectionError('Connection error')
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if upgrade:
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p = packet.Packet(packet.PING,
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data=six.text_type('probe')).encode()
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try:
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ws.send(p)
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except Exception as e: # pragma: no cover
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self.logger.warning(
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'WebSocket upgrade failed: unexpected send exception: %s',
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str(e))
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return False
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try:
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p = ws.recv()
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except Exception as e: # pragma: no cover
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self.logger.warning(
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'WebSocket upgrade failed: unexpected recv exception: %s',
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str(e))
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return False
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pkt = packet.Packet(encoded_packet=p)
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if pkt.packet_type != packet.PONG or pkt.data != 'probe':
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self.logger.warning(
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'WebSocket upgrade failed: no PONG packet')
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return False
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p = packet.Packet(packet.UPGRADE).encode()
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try:
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ws.send(p)
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except Exception as e: # pragma: no cover
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self.logger.warning(
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'WebSocket upgrade failed: unexpected send exception: %s',
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str(e))
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return False
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self.current_transport = 'websocket'
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self.logger.info('WebSocket upgrade was successful')
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else:
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try:
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p = ws.recv()
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except Exception as e: # pragma: no cover
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raise exceptions.ConnectionError(
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'Unexpected recv exception: ' + str(e))
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open_packet = packet.Packet(encoded_packet=p)
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if open_packet.packet_type != packet.OPEN:
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raise exceptions.ConnectionError('no OPEN packet')
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self.logger.info(
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'WebSocket connection accepted with ' + str(open_packet.data))
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self.sid = open_packet.data['sid']
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self.upgrades = open_packet.data['upgrades']
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self.ping_interval = open_packet.data['pingInterval'] / 1000.0
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self.ping_timeout = open_packet.data['pingTimeout'] / 1000.0
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self.current_transport = 'websocket'
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self.state = 'connected'
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connected_clients.append(self)
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self._trigger_event('connect', run_async=False)
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self.ws = ws
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# start background tasks associated with this client
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self.ping_loop_task = self.start_background_task(self._ping_loop)
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self.write_loop_task = self.start_background_task(self._write_loop)
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self.read_loop_task = self.start_background_task(
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self._read_loop_websocket)
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return True
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def _receive_packet(self, pkt):
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"""Handle incoming packets from the server."""
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packet_name = packet.packet_names[pkt.packet_type] \
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if pkt.packet_type < len(packet.packet_names) else 'UNKNOWN'
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self.logger.info(
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'Received packet %s data %s', packet_name,
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pkt.data if not isinstance(pkt.data, bytes) else '<binary>')
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if pkt.packet_type == packet.MESSAGE:
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self._trigger_event('message', pkt.data, run_async=True)
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elif pkt.packet_type == packet.PONG:
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self.pong_received = True
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elif pkt.packet_type == packet.CLOSE:
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self.disconnect(abort=True)
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elif pkt.packet_type == packet.NOOP:
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pass
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else:
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self.logger.error('Received unexpected packet of type %s',
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pkt.packet_type)
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def _send_packet(self, pkt):
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"""Queue a packet to be sent to the server."""
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if self.state != 'connected':
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return
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self.queue.put(pkt)
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self.logger.info(
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'Sending packet %s data %s',
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packet.packet_names[pkt.packet_type],
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pkt.data if not isinstance(pkt.data, bytes) else '<binary>')
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|
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def _send_request(
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self, method, url, headers=None, body=None,
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timeout=None): # pragma: no cover
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|
if self.http is None:
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|
self.http = requests.Session()
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|
try:
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|
return self.http.request(method, url, headers=headers, data=body,
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timeout=timeout, verify=self.ssl_verify)
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|
except requests.exceptions.RequestException as exc:
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self.logger.info('HTTP %s request to %s failed with error %s.',
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method, url, exc)
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def _trigger_event(self, event, *args, **kwargs):
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|
"""Invoke an event handler."""
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|
run_async = kwargs.pop('run_async', False)
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if event in self.handlers:
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if run_async:
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return self.start_background_task(self.handlers[event], *args)
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|
else:
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try:
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return self.handlers[event](*args)
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|
except:
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self.logger.exception(event + ' handler error')
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|
|
def _get_engineio_url(self, url, engineio_path, transport):
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|
"""Generate the Engine.IO connection URL."""
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|
engineio_path = engineio_path.strip('/')
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parsed_url = urllib.parse.urlparse(url)
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|
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if transport == 'polling':
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scheme = 'http'
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elif transport == 'websocket':
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scheme = 'ws'
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else: # pragma: no cover
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raise ValueError('invalid transport')
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|
if parsed_url.scheme in ['https', 'wss']:
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scheme += 's'
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return ('{scheme}://{netloc}/{path}/?{query}'
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|
'{sep}transport={transport}&EIO=3').format(
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scheme=scheme, netloc=parsed_url.netloc,
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path=engineio_path, query=parsed_url.query,
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sep='&' if parsed_url.query else '',
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transport=transport)
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|
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def _get_url_timestamp(self):
|
|
"""Generate the Engine.IO query string timestamp."""
|
|
return '&t=' + str(time.time())
|
|
|
|
def _ping_loop(self):
|
|
"""This background task sends a PING to the server at the requested
|
|
interval.
|
|
"""
|
|
self.pong_received = True
|
|
if self.ping_loop_event is None:
|
|
self.ping_loop_event = self.create_event()
|
|
else:
|
|
self.ping_loop_event.clear()
|
|
while self.state == 'connected':
|
|
if not self.pong_received:
|
|
self.logger.info(
|
|
'PONG response has not been received, aborting')
|
|
if self.ws:
|
|
self.ws.close(timeout=0)
|
|
self.queue.put(None)
|
|
break
|
|
self.pong_received = False
|
|
self._send_packet(packet.Packet(packet.PING))
|
|
self.ping_loop_event.wait(timeout=self.ping_interval)
|
|
self.logger.info('Exiting ping task')
|
|
|
|
def _read_loop_polling(self):
|
|
"""Read packets by polling the Engine.IO server."""
|
|
while self.state == 'connected':
|
|
self.logger.info(
|
|
'Sending polling GET request to ' + self.base_url)
|
|
r = self._send_request(
|
|
'GET', self.base_url + self._get_url_timestamp(),
|
|
timeout=max(self.ping_interval, self.ping_timeout) + 5)
|
|
if r is None:
|
|
self.logger.warning(
|
|
'Connection refused by the server, aborting')
|
|
self.queue.put(None)
|
|
break
|
|
if r.status_code < 200 or r.status_code >= 300:
|
|
self.logger.warning('Unexpected status code %s in server '
|
|
'response, aborting', r.status_code)
|
|
self.queue.put(None)
|
|
break
|
|
try:
|
|
p = payload.Payload(encoded_payload=r.content)
|
|
except ValueError:
|
|
self.logger.warning(
|
|
'Unexpected packet from server, aborting')
|
|
self.queue.put(None)
|
|
break
|
|
for pkt in p.packets:
|
|
self._receive_packet(pkt)
|
|
|
|
self.logger.info('Waiting for write loop task to end')
|
|
self.write_loop_task.join()
|
|
self.logger.info('Waiting for ping loop task to end')
|
|
if self.ping_loop_event: # pragma: no cover
|
|
self.ping_loop_event.set()
|
|
self.ping_loop_task.join()
|
|
if self.state == 'connected':
|
|
self._trigger_event('disconnect', run_async=False)
|
|
try:
|
|
connected_clients.remove(self)
|
|
except ValueError: # pragma: no cover
|
|
pass
|
|
self._reset()
|
|
self.logger.info('Exiting read loop task')
|
|
|
|
def _read_loop_websocket(self):
|
|
"""Read packets from the Engine.IO WebSocket connection."""
|
|
while self.state == 'connected':
|
|
p = None
|
|
try:
|
|
p = self.ws.recv()
|
|
except websocket.WebSocketConnectionClosedException:
|
|
self.logger.warning(
|
|
'WebSocket connection was closed, aborting')
|
|
self.queue.put(None)
|
|
break
|
|
except Exception as e:
|
|
self.logger.info(
|
|
'Unexpected error "%s", aborting', str(e))
|
|
self.queue.put(None)
|
|
break
|
|
if isinstance(p, six.text_type): # pragma: no cover
|
|
p = p.encode('utf-8')
|
|
pkt = packet.Packet(encoded_packet=p)
|
|
self._receive_packet(pkt)
|
|
|
|
self.logger.info('Waiting for write loop task to end')
|
|
self.write_loop_task.join()
|
|
self.logger.info('Waiting for ping loop task to end')
|
|
if self.ping_loop_event: # pragma: no cover
|
|
self.ping_loop_event.set()
|
|
self.ping_loop_task.join()
|
|
if self.state == 'connected':
|
|
self._trigger_event('disconnect', run_async=False)
|
|
try:
|
|
connected_clients.remove(self)
|
|
except ValueError: # pragma: no cover
|
|
pass
|
|
self._reset()
|
|
self.logger.info('Exiting read loop task')
|
|
|
|
def _write_loop(self):
|
|
"""This background task sends packages to the server as they are
|
|
pushed to the send queue.
|
|
"""
|
|
while self.state == 'connected':
|
|
# to simplify the timeout handling, use the maximum of the
|
|
# ping interval and ping timeout as timeout, with an extra 5
|
|
# seconds grace period
|
|
timeout = max(self.ping_interval, self.ping_timeout) + 5
|
|
packets = None
|
|
try:
|
|
packets = [self.queue.get(timeout=timeout)]
|
|
except self.queue.Empty:
|
|
self.logger.error('packet queue is empty, aborting')
|
|
break
|
|
if packets == [None]:
|
|
self.queue.task_done()
|
|
packets = []
|
|
else:
|
|
while True:
|
|
try:
|
|
packets.append(self.queue.get(block=False))
|
|
except self.queue.Empty:
|
|
break
|
|
if packets[-1] is None:
|
|
packets = packets[:-1]
|
|
self.queue.task_done()
|
|
break
|
|
if not packets:
|
|
# empty packet list returned -> connection closed
|
|
break
|
|
if self.current_transport == 'polling':
|
|
p = payload.Payload(packets=packets)
|
|
r = self._send_request(
|
|
'POST', self.base_url, body=p.encode(),
|
|
headers={'Content-Type': 'application/octet-stream'},
|
|
timeout=self.request_timeout)
|
|
for pkt in packets:
|
|
self.queue.task_done()
|
|
if r is None:
|
|
self.logger.warning(
|
|
'Connection refused by the server, aborting')
|
|
break
|
|
if r.status_code < 200 or r.status_code >= 300:
|
|
self.logger.warning('Unexpected status code %s in server '
|
|
'response, aborting', r.status_code)
|
|
self._reset()
|
|
break
|
|
else:
|
|
# websocket
|
|
try:
|
|
for pkt in packets:
|
|
encoded_packet = pkt.encode(always_bytes=False)
|
|
if pkt.binary:
|
|
self.ws.send_binary(encoded_packet)
|
|
else:
|
|
self.ws.send(encoded_packet)
|
|
self.queue.task_done()
|
|
except websocket.WebSocketConnectionClosedException:
|
|
self.logger.warning(
|
|
'WebSocket connection was closed, aborting')
|
|
break
|
|
self.logger.info('Exiting write loop task')
|