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296 lines (247 loc) · 11.4 KB
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import itertools
import logging
import signal
import threading
import engineio
from . import base_namespace
from . import packet
default_logger = logging.getLogger('socketio.client')
reconnecting_clients = []
def signal_handler(sig, frame): # pragma: no cover
"""SIGINT handler.
Notify any clients that are in a reconnect loop to abort. Other
disconnection tasks are handled at the engine.io level.
"""
for client in reconnecting_clients[:]:
client._reconnect_abort.set()
if callable(original_signal_handler):
return original_signal_handler(sig, frame)
else: # pragma: no cover
# Handle case where no original SIGINT handler was present.
return signal.default_int_handler(sig, frame)
original_signal_handler = None
class BaseClient:
reserved_events = ['connect', 'connect_error', 'disconnect',
'__disconnect_final']
reason = engineio.Client.reason
def __init__(self, reconnection=True, reconnection_attempts=0,
reconnection_delay=1, reconnection_delay_max=5,
randomization_factor=0.5, logger=False, serializer='default',
json=None, handle_sigint=True, **kwargs):
global original_signal_handler
if handle_sigint and original_signal_handler is None and \
threading.current_thread() == threading.main_thread():
original_signal_handler = signal.signal(signal.SIGINT,
signal_handler)
self.reconnection = reconnection
self.reconnection_attempts = reconnection_attempts
self.reconnection_delay = reconnection_delay
self.reconnection_delay_max = reconnection_delay_max
self.randomization_factor = randomization_factor
self.handle_sigint = handle_sigint
engineio_options = kwargs
engineio_options['handle_sigint'] = handle_sigint
engineio_logger = engineio_options.pop('engineio_logger', None)
if engineio_logger is not None:
engineio_options['logger'] = engineio_logger
if serializer == 'default':
self.packet_class = packet.Packet
elif serializer == 'msgpack':
from . import msgpack_packet
self.packet_class = msgpack_packet.MsgPackPacket
else:
self.packet_class = serializer
if json is not None:
self.packet_class.json = json
engineio_options['json'] = json
self.eio = self._engineio_client_class()(**engineio_options)
self.eio.on('connect', self._handle_eio_connect)
self.eio.on('message', self._handle_eio_message)
self.eio.on('disconnect', self._handle_eio_disconnect)
if not isinstance(logger, bool):
self.logger = logger
else:
self.logger = default_logger
if self.logger.level == logging.NOTSET:
if logger:
self.logger.setLevel(logging.INFO)
else:
self.logger.setLevel(logging.ERROR)
self.logger.addHandler(logging.StreamHandler())
self.connection_url = None
self.connection_headers = None
self.connection_auth = None
self.connection_transports = None
self.connection_namespaces = []
self.socketio_path = None
self.sid = None
self.connected = False #: Indicates if the client is connected or not.
self.namespaces = {} #: set of connected namespaces.
self.failed_namespaces = []
self.handlers = {}
self.namespace_handlers = {}
self.callbacks = {}
self._binary_packet = None
self._connect_event = None
self._reconnect_task = None
self._reconnect_abort = None
def is_asyncio_based(self):
return False
def on(self, event, handler=None, namespace=None):
"""Register an event handler.
:param event: The event name. It can be any string. The event names
``'connect'``, ``'message'`` and ``'disconnect'`` are
reserved and should not be used. The ``'*'`` event name
can be used to define a catch-all event handler.
:param handler: The function that should be invoked to handle the
event. When this parameter is not given, the method
acts as a decorator for the handler function.
:param namespace: The Socket.IO namespace for the event. If this
argument is omitted the handler is associated with
the default namespace. A catch-all namespace can be
defined by passing ``'*'`` as the namespace.
Example usage::
# as a decorator:
@sio.on('connect')
def connect_handler():
print('Connected!')
# as a method:
def message_handler(msg):
print('Received message: ', msg)
sio.send( 'response')
sio.on('message', message_handler)
The arguments passed to the handler function depend on the event type:
- The ``'connect'`` event handler does not take arguments.
- The ``'disconnect'`` event handler does not take arguments.
- The ``'message'`` handler and handlers for custom event names receive
the message payload as only argument. Any values returned from a
message handler will be passed to the client's acknowledgement
callback function if it exists.
- A catch-all event handler receives the event name as first argument,
followed by any arguments specific to the event.
- A catch-all namespace event handler receives the namespace as first
argument, followed by any arguments specific to the event.
- A combined catch-all namespace and catch-all event handler receives
the event name as first argument and the namespace as second
argument, followed by any arguments specific to the event.
"""
namespace = namespace or '/'
def set_handler(handler):
if namespace not in self.handlers:
self.handlers[namespace] = {}
self.handlers[namespace][event] = handler
return handler
if handler is None:
return set_handler
set_handler(handler)
def event(self, *args, **kwargs):
"""Decorator to register an event handler.
This is a simplified version of the ``on()`` method that takes the
event name from the decorated function.
Example usage::
@sio.event
def my_event(data):
print('Received data: ', data)
The above example is equivalent to::
@sio.on('my_event')
def my_event(data):
print('Received data: ', data)
A custom namespace can be given as an argument to the decorator::
@sio.event(namespace='/test')
def my_event(data):
print('Received data: ', data)
"""
if len(args) == 1 and len(kwargs) == 0 and callable(args[0]):
# the decorator was invoked without arguments
# args[0] is the decorated function
return self.on(args[0].__name__)(args[0])
else:
# the decorator was invoked with arguments
def set_handler(handler):
return self.on(handler.__name__, *args, **kwargs)(handler)
return set_handler
def register_namespace(self, namespace_handler):
"""Register a namespace handler object.
:param namespace_handler: An instance of a :class:`Namespace`
subclass that handles all the event traffic
for a namespace.
"""
if not isinstance(namespace_handler,
base_namespace.BaseClientNamespace):
raise ValueError('Not a namespace instance')
if self.is_asyncio_based() != namespace_handler.is_asyncio_based():
raise ValueError('Not a valid namespace class for this client')
namespace_handler._set_client(self)
self.namespace_handlers[namespace_handler.namespace] = \
namespace_handler
def get_sid(self, namespace=None):
"""Return the ``sid`` associated with a connection.
:param namespace: The Socket.IO namespace. If this argument is omitted
the handler is associated with the default
namespace. Note that unlike previous versions, the
current version of the Socket.IO protocol uses
different ``sid`` values per namespace.
This method returns the ``sid`` for the requested namespace as a
string.
"""
return self.namespaces.get(namespace or '/')
def transport(self):
"""Return the name of the transport used by the client.
The two possible values returned by this function are ``'polling'``
and ``'websocket'``.
"""
return self.eio.transport()
def _get_event_handler(self, event, namespace, args):
# return the appropriate application event handler
#
# Resolution priority:
# - self.handlers[namespace][event]
# - self.handlers[namespace]["*"]
# - self.handlers["*"][event]
# - self.handlers["*"]["*"]
handler = None
if namespace in self.handlers:
if event in self.handlers[namespace]:
handler = self.handlers[namespace][event]
elif event not in self.reserved_events and \
'*' in self.handlers[namespace]:
handler = self.handlers[namespace]['*']
args = (event, *args)
elif '*' in self.handlers:
if event in self.handlers['*']:
handler = self.handlers['*'][event]
args = (namespace, *args)
elif event not in self.reserved_events and \
'*' in self.handlers['*']:
handler = self.handlers['*']['*']
args = (event, namespace, *args)
return handler, args
def _get_namespace_handler(self, namespace, args):
# Return the appropriate application event handler.
#
# Resolution priority:
# - self.namespace_handlers[namespace]
# - self.namespace_handlers["*"]
handler = None
if namespace in self.namespace_handlers:
handler = self.namespace_handlers[namespace]
elif '*' in self.namespace_handlers:
handler = self.namespace_handlers['*']
args = (namespace, *args)
return handler, args
def _generate_ack_id(self, namespace, callback):
"""Generate a unique identifier for an ACK packet."""
namespace = namespace or '/'
if namespace not in self.callbacks:
self.callbacks[namespace] = {0: itertools.count(1)}
id = next(self.callbacks[namespace][0])
self.callbacks[namespace][id] = callback
return id
def _handle_eio_connect(self): # pragma: no cover
raise NotImplementedError()
def _handle_eio_message(self, data): # pragma: no cover
raise NotImplementedError()
def _handle_eio_disconnect(self, reason): # pragma: no cover
raise NotImplementedError()
def _engineio_client_class(self): # pragma: no cover
raise NotImplementedError()
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