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676 lines
28 KiB
676 lines
28 KiB
import gzip
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import importlib
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import logging
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import uuid
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import zlib
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import six
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from six.moves import urllib
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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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from . import socket
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default_logger = logging.getLogger('engineio.server')
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class Server(object):
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"""An Engine.IO server.
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This class implements a fully compliant Engine.IO web server with support
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for websocket and long-polling transports.
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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 the one that is chosen.
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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 60 seconds.
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:param ping_interval: The interval in seconds at which the client pings
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the server. 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. The default
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grace period 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 100,000,000
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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: Name of the HTTP cookie that contains the client session
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id. If set to ``None``, a cookie is not sent to the client.
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The default is ``'io'``.
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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
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is ``True``.
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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 async_handlers: If set to ``True``, run message event handlers in
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non-blocking threads. To run handlers synchronously,
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set to ``False``. The default is ``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 kwargs: Reserved for future extensions, any additional parameters
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given as keyword arguments will be silently ignored.
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"""
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compression_methods = ['gzip', 'deflate']
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event_names = ['connect', 'disconnect', 'message']
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_default_monitor_clients = True
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def __init__(self, async_mode=None, ping_timeout=60, ping_interval=25,
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max_http_buffer_size=100000000, allow_upgrades=True,
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http_compression=True, compression_threshold=1024,
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cookie='io', cors_allowed_origins=None,
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cors_credentials=True, logger=False, json=None,
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async_handlers=True, monitor_clients=None, **kwargs):
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self.ping_timeout = ping_timeout
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if isinstance(ping_interval, tuple):
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self.ping_interval = ping_interval[0]
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self.ping_interval_grace_period = ping_interval[1]
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else:
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self.ping_interval = ping_interval
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self.ping_interval_grace_period = 5
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self.max_http_buffer_size = max_http_buffer_size
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self.allow_upgrades = allow_upgrades
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self.http_compression = http_compression
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self.compression_threshold = compression_threshold
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self.cookie = cookie
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self.cors_allowed_origins = cors_allowed_origins
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self.cors_credentials = cors_credentials
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self.async_handlers = async_handlers
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self.sockets = {}
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self.handlers = {}
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self.start_service_task = monitor_clients \
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if monitor_clients is not None else self._default_monitor_clients
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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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modes = self.async_modes()
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if async_mode is not None:
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modes = [async_mode] if async_mode in modes else []
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self._async = None
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self.async_mode = None
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for mode in modes:
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try:
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self._async = importlib.import_module(
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'engineio.async_drivers.' + mode)._async
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asyncio_based = self._async['asyncio'] \
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if 'asyncio' in self._async else False
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if asyncio_based != self.is_asyncio_based():
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continue # pragma: no cover
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self.async_mode = mode
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break
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except ImportError:
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pass
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if self.async_mode is None:
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raise ValueError('Invalid async_mode specified')
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if self.is_asyncio_based() and \
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('asyncio' not in self._async or not
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self._async['asyncio']): # pragma: no cover
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raise ValueError('The selected async_mode is not asyncio '
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'compatible')
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if not self.is_asyncio_based() and 'asyncio' in self._async and \
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self._async['asyncio']: # pragma: no cover
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raise ValueError('The selected async_mode requires asyncio and '
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'must use the AsyncServer class')
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self.logger.info('Server initialized for %s.', self.async_mode)
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def is_asyncio_based(self):
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return False
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def async_modes(self):
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return ['eventlet', 'gevent_uwsgi', 'gevent', 'threading']
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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(sid, environ):
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print('Connection request')
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if environ['REMOTE_ADDR'] in blacklisted:
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return False # reject
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# as a method:
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def message_handler(sid, msg):
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print('Received message: ', msg)
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eio.send(sid, 'response')
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eio.on('message', message_handler)
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The handler function receives the ``sid`` (session ID) for the
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client as first argument. The ``'connect'`` event handler receives the
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WSGI environment as a second argument, and can return ``False`` to
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reject the connection. The ``'message'`` handler receives the message
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payload as a second argument. The ``'disconnect'`` handler does not
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take a second argument.
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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 send(self, sid, data, binary=None):
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"""Send a message to a client.
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:param sid: The session id of the recipient 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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try:
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socket = self._get_socket(sid)
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except KeyError:
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# the socket is not available
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self.logger.warning('Cannot send to sid %s', sid)
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return
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socket.send(packet.Packet(packet.MESSAGE, data=data, binary=binary))
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def get_session(self, sid):
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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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The return value is a dictionary. Modifications made to this
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dictionary are not guaranteed to be preserved unless
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``save_session()`` is called, or when the ``session`` context manager
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is used.
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"""
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socket = self._get_socket(sid)
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return socket.session
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def save_session(self, sid, session):
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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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"""
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socket = self._get_socket(sid)
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socket.session = session
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def session(self, sid):
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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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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):
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self.server = server
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self.sid = sid
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self.session = None
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def __enter__(self):
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self.session = self.server.get_session(sid)
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return self.session
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def __exit__(self, *args):
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self.server.save_session(sid, self.session)
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return _session_context_manager(self, sid)
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def disconnect(self, sid=None):
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"""Disconnect a client.
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:param sid: The session id of the client to close. If this parameter
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is not given, then all clients are closed.
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"""
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if sid is not None:
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try:
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socket = self._get_socket(sid)
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except KeyError: # pragma: no cover
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# the socket was already closed or gone
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pass
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else:
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socket.close()
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if sid in self.sockets: # pragma: no cover
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del self.sockets[sid]
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else:
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for client in six.itervalues(self.sockets):
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client.close()
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self.sockets = {}
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def transport(self, sid):
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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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:param sid: The session of the client.
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"""
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return 'websocket' if self._get_socket(sid).upgraded else 'polling'
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def handle_request(self, environ, start_response):
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"""Handle an HTTP request from the client.
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This is the entry point of the Engine.IO application, using the same
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interface as a WSGI application. For the typical usage, this function
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is invoked by the :class:`Middleware` instance, but it can be invoked
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directly when the middleware is not used.
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:param environ: The WSGI environment.
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:param start_response: The WSGI ``start_response`` function.
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This function returns the HTTP response body to deliver to the client
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as a byte sequence.
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"""
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if self.cors_allowed_origins != []:
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# Validate the origin header if present
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# This is important for WebSocket more than for HTTP, since
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# browsers only apply CORS controls to HTTP.
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origin = environ.get('HTTP_ORIGIN')
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if origin:
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allowed_origins = self._cors_allowed_origins(environ)
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if allowed_origins is not None and origin not in \
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allowed_origins:
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self.logger.info(origin + ' is not an accepted origin.')
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r = self._bad_request()
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start_response(r['status'], r['headers'])
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return [r['response']]
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method = environ['REQUEST_METHOD']
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query = urllib.parse.parse_qs(environ.get('QUERY_STRING', ''))
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sid = query['sid'][0] if 'sid' in query else None
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b64 = False
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jsonp = False
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jsonp_index = None
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if 'b64' in query:
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if query['b64'][0] == "1" or query['b64'][0].lower() == "true":
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b64 = True
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if 'j' in query:
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jsonp = True
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try:
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jsonp_index = int(query['j'][0])
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except (ValueError, KeyError, IndexError):
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# Invalid JSONP index number
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pass
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if jsonp and jsonp_index is None:
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self.logger.warning('Invalid JSONP index number')
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r = self._bad_request()
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elif method == 'GET':
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if sid is None:
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transport = query.get('transport', ['polling'])[0]
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if transport != 'polling' and transport != 'websocket':
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self.logger.warning('Invalid transport %s', transport)
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r = self._bad_request()
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else:
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r = self._handle_connect(environ, start_response,
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transport, b64, jsonp_index)
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else:
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if sid not in self.sockets:
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self.logger.warning('Invalid session %s', sid)
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r = self._bad_request()
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else:
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socket = self._get_socket(sid)
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try:
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packets = socket.handle_get_request(
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environ, start_response)
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if isinstance(packets, list):
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r = self._ok(packets, b64=b64,
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jsonp_index=jsonp_index)
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else:
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r = packets
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except exceptions.EngineIOError:
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if sid in self.sockets: # pragma: no cover
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self.disconnect(sid)
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r = self._bad_request()
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if sid in self.sockets and self.sockets[sid].closed:
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del self.sockets[sid]
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elif method == 'POST':
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if sid is None or sid not in self.sockets:
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self.logger.warning('Invalid session %s', sid)
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r = self._bad_request()
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else:
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socket = self._get_socket(sid)
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try:
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socket.handle_post_request(environ)
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r = self._ok(jsonp_index=jsonp_index)
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except exceptions.EngineIOError:
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if sid in self.sockets: # pragma: no cover
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self.disconnect(sid)
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r = self._bad_request()
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except: # pragma: no cover
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# for any other unexpected errors, we log the error
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# and keep going
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self.logger.exception('post request handler error')
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r = self._ok(jsonp_index=jsonp_index)
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elif method == 'OPTIONS':
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r = self._ok()
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else:
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self.logger.warning('Method %s not supported', method)
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r = self._method_not_found()
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if not isinstance(r, dict):
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return r or []
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if self.http_compression and \
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len(r['response']) >= self.compression_threshold:
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encodings = [e.split(';')[0].strip() for e in
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environ.get('HTTP_ACCEPT_ENCODING', '').split(',')]
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for encoding in encodings:
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if encoding in self.compression_methods:
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r['response'] = \
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getattr(self, '_' + encoding)(r['response'])
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r['headers'] += [('Content-Encoding', encoding)]
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break
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cors_headers = self._cors_headers(environ)
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start_response(r['status'], r['headers'] + cors_headers)
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return [r['response']]
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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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th = self._async['thread'](target=target, args=args, kwargs=kwargs)
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th.start()
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return th # pragma: no cover
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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._async['sleep'](seconds)
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def create_queue(self, *args, **kwargs):
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|
"""Create a queue object using the appropriate async model.
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|
This is a utility function that applications can use to create a queue
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|
without having to worry about using the correct call for the selected
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async mode.
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"""
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return self._async['queue'](*args, **kwargs)
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def get_queue_empty_exception(self):
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"""Return the queue empty exception for the appropriate async model.
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|
This is a utility function that applications can use to work with a
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queue 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._async['queue_empty']
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def create_event(self, *args, **kwargs):
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|
"""Create an event object using the appropriate async model.
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|
This is a utility function that applications can use to create an
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|
event 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._async['event'](*args, **kwargs)
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def _generate_id(self):
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|
"""Generate a unique session id."""
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return uuid.uuid4().hex
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|
|
def _handle_connect(self, environ, start_response, transport, b64=False,
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jsonp_index=None):
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"""Handle a client connection request."""
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|
if self.start_service_task:
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# start the service task to monitor connected clients
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|
self.start_service_task = False
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self.start_background_task(self._service_task)
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sid = self._generate_id()
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s = socket.Socket(self, sid)
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|
self.sockets[sid] = s
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pkt = packet.Packet(
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packet.OPEN, {'sid': sid,
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'upgrades': self._upgrades(sid, transport),
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'pingTimeout': int(self.ping_timeout * 1000),
|
|
'pingInterval': int(self.ping_interval * 1000)})
|
|
s.send(pkt)
|
|
|
|
ret = self._trigger_event('connect', sid, environ, run_async=False)
|
|
if ret is False:
|
|
del self.sockets[sid]
|
|
self.logger.warning('Application rejected connection')
|
|
return self._unauthorized()
|
|
|
|
if transport == 'websocket':
|
|
ret = s.handle_get_request(environ, start_response)
|
|
if s.closed:
|
|
# websocket connection ended, so we are done
|
|
del self.sockets[sid]
|
|
return ret
|
|
else:
|
|
s.connected = True
|
|
headers = None
|
|
if self.cookie:
|
|
headers = [('Set-Cookie', self.cookie + '=' + sid)]
|
|
try:
|
|
return self._ok(s.poll(), headers=headers, b64=b64,
|
|
jsonp_index=jsonp_index)
|
|
except exceptions.QueueEmpty:
|
|
return self._bad_request()
|
|
|
|
def _upgrades(self, sid, transport):
|
|
"""Return the list of possible upgrades for a client connection."""
|
|
if not self.allow_upgrades or self._get_socket(sid).upgraded or \
|
|
self._async['websocket'] is None or transport == 'websocket':
|
|
return []
|
|
return ['websocket']
|
|
|
|
def _trigger_event(self, event, *args, **kwargs):
|
|
"""Invoke an event handler."""
|
|
run_async = kwargs.pop('run_async', False)
|
|
if event in self.handlers:
|
|
if run_async:
|
|
return self.start_background_task(self.handlers[event], *args)
|
|
else:
|
|
try:
|
|
return self.handlers[event](*args)
|
|
except:
|
|
self.logger.exception(event + ' handler error')
|
|
if event == 'connect':
|
|
# if connect handler raised error we reject the
|
|
# connection
|
|
return False
|
|
|
|
def _get_socket(self, sid):
|
|
"""Return the socket object for a given session."""
|
|
try:
|
|
s = self.sockets[sid]
|
|
except KeyError:
|
|
raise KeyError('Session not found')
|
|
if s.closed:
|
|
del self.sockets[sid]
|
|
raise KeyError('Session is disconnected')
|
|
return s
|
|
|
|
def _ok(self, packets=None, headers=None, b64=False, jsonp_index=None):
|
|
"""Generate a successful HTTP response."""
|
|
if packets is not None:
|
|
if headers is None:
|
|
headers = []
|
|
if b64:
|
|
headers += [('Content-Type', 'text/plain; charset=UTF-8')]
|
|
else:
|
|
headers += [('Content-Type', 'application/octet-stream')]
|
|
return {'status': '200 OK',
|
|
'headers': headers,
|
|
'response': payload.Payload(packets=packets).encode(
|
|
b64=b64, jsonp_index=jsonp_index)}
|
|
else:
|
|
return {'status': '200 OK',
|
|
'headers': [('Content-Type', 'text/plain')],
|
|
'response': b'OK'}
|
|
|
|
def _bad_request(self):
|
|
"""Generate a bad request HTTP error response."""
|
|
return {'status': '400 BAD REQUEST',
|
|
'headers': [('Content-Type', 'text/plain')],
|
|
'response': b'Bad Request'}
|
|
|
|
def _method_not_found(self):
|
|
"""Generate a method not found HTTP error response."""
|
|
return {'status': '405 METHOD NOT FOUND',
|
|
'headers': [('Content-Type', 'text/plain')],
|
|
'response': b'Method Not Found'}
|
|
|
|
def _unauthorized(self):
|
|
"""Generate a unauthorized HTTP error response."""
|
|
return {'status': '401 UNAUTHORIZED',
|
|
'headers': [('Content-Type', 'text/plain')],
|
|
'response': b'Unauthorized'}
|
|
|
|
def _cors_allowed_origins(self, environ):
|
|
default_origins = []
|
|
if 'wsgi.url_scheme' in environ and 'HTTP_HOST' in environ:
|
|
default_origins.append('{scheme}://{host}'.format(
|
|
scheme=environ['wsgi.url_scheme'], host=environ['HTTP_HOST']))
|
|
if 'HTTP_X_FORWARDED_HOST' in environ:
|
|
scheme = environ.get(
|
|
'HTTP_X_FORWARDED_PROTO',
|
|
environ['wsgi.url_scheme']).split(',')[0].strip()
|
|
default_origins.append('{scheme}://{host}'.format(
|
|
scheme=scheme, host=environ['HTTP_X_FORWARDED_HOST'].split(
|
|
',')[0].strip()))
|
|
if self.cors_allowed_origins is None:
|
|
allowed_origins = default_origins
|
|
elif self.cors_allowed_origins == '*':
|
|
allowed_origins = None
|
|
elif isinstance(self.cors_allowed_origins, six.string_types):
|
|
allowed_origins = [self.cors_allowed_origins]
|
|
else:
|
|
allowed_origins = self.cors_allowed_origins
|
|
return allowed_origins
|
|
|
|
def _cors_headers(self, environ):
|
|
"""Return the cross-origin-resource-sharing headers."""
|
|
if self.cors_allowed_origins == []:
|
|
# special case, CORS handling is completely disabled
|
|
return []
|
|
headers = []
|
|
allowed_origins = self._cors_allowed_origins(environ)
|
|
if 'HTTP_ORIGIN' in environ and \
|
|
(allowed_origins is None or environ['HTTP_ORIGIN'] in
|
|
allowed_origins):
|
|
headers = [('Access-Control-Allow-Origin', environ['HTTP_ORIGIN'])]
|
|
if environ['REQUEST_METHOD'] == 'OPTIONS':
|
|
headers += [('Access-Control-Allow-Methods', 'OPTIONS, GET, POST')]
|
|
if 'HTTP_ACCESS_CONTROL_REQUEST_HEADERS' in environ:
|
|
headers += [('Access-Control-Allow-Headers',
|
|
environ['HTTP_ACCESS_CONTROL_REQUEST_HEADERS'])]
|
|
if self.cors_credentials:
|
|
headers += [('Access-Control-Allow-Credentials', 'true')]
|
|
return headers
|
|
|
|
def _gzip(self, response):
|
|
"""Apply gzip compression to a response."""
|
|
bytesio = six.BytesIO()
|
|
with gzip.GzipFile(fileobj=bytesio, mode='w') as gz:
|
|
gz.write(response)
|
|
return bytesio.getvalue()
|
|
|
|
def _deflate(self, response):
|
|
"""Apply deflate compression to a response."""
|
|
return zlib.compress(response)
|
|
|
|
def _service_task(self): # pragma: no cover
|
|
"""Monitor connected clients and clean up those that time out."""
|
|
while True:
|
|
if len(self.sockets) == 0:
|
|
# nothing to do
|
|
self.sleep(self.ping_timeout)
|
|
continue
|
|
|
|
# go through the entire client list in a ping interval cycle
|
|
sleep_interval = float(self.ping_timeout) / len(self.sockets)
|
|
|
|
try:
|
|
# iterate over the current clients
|
|
for s in self.sockets.copy().values():
|
|
if not s.closing and not s.closed:
|
|
s.check_ping_timeout()
|
|
self.sleep(sleep_interval)
|
|
except (SystemExit, KeyboardInterrupt):
|
|
self.logger.info('service task canceled')
|
|
break
|
|
except:
|
|
# an unexpected exception has occurred, log it and continue
|
|
self.logger.exception('service task exception')
|