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import logging
import signal
import threading
import time
import urllib
from . import packet
default_logger = logging.getLogger('engineio.client')
connected_clients = []
def signal_handler(sig, frame):
"""SIGINT handler.
Disconnect all active clients and then invoke the original signal handler.
"""
for client in connected_clients[:]:
if not client.is_asyncio_based():
client.disconnect()
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:
event_names = ['connect', 'disconnect', 'message']
def __init__(self, logger=False, json=None, request_timeout=5,
http_session=None, ssl_verify=True, handle_sigint=True,
websocket_extra_options=None):
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.handlers = {}
self.base_url = None
self.transports = None
self.current_transport = None
self.sid = None
self.upgrades = None
self.ping_interval = None
self.ping_timeout = None
self.http = http_session
self.external_http = http_session is not None
self.handle_sigint = handle_sigint
self.ws = None
self.read_loop_task = None
self.write_loop_task = None
self.queue = None
self.state = 'disconnected'
self.ssl_verify = ssl_verify
self.websocket_extra_options = websocket_extra_options or {}
if json is not None:
packet.Packet.json = json
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.request_timeout = request_timeout
def is_asyncio_based(self):
return False
def on(self, event, handler=None):
"""Register an event handler.
:param event: The event name. Can be ``'connect'``, ``'message'`` or
``'disconnect'``.
: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.
Example usage::
# as a decorator:
@eio.on('connect')
def connect_handler():
print('Connection request')
# as a method:
def message_handler(msg):
print('Received message: ', msg)
eio.send('response')
eio.on('message', message_handler)
"""
if event not in self.event_names:
raise ValueError('Invalid event')
def set_handler(handler):
self.handlers[event] = handler
return handler
if handler is None:
return set_handler
set_handler(handler)
def transport(self):
"""Return the name of the transport currently in use.
The possible values returned by this function are ``'polling'`` and
``'websocket'``.
"""
return self.current_transport
def _reset(self):
self.state = 'disconnected'
self.sid = None
def _get_engineio_url(self, url, engineio_path, transport):
"""Generate the Engine.IO connection URL."""
engineio_path = engineio_path.strip('/')
parsed_url = urllib.parse.urlparse(url)
if transport == 'polling':
scheme = 'http'
elif transport == 'websocket':
scheme = 'ws'
else: # pragma: no cover
raise ValueError('invalid transport')
if parsed_url.scheme in ['https', 'wss']:
scheme += 's'
return ('{scheme}://{netloc}/{path}/?{query}'
'{sep}transport={transport}&EIO=4').format(
scheme=scheme, netloc=parsed_url.netloc,
path=engineio_path, query=parsed_url.query,
sep='&' if parsed_url.query else '',
transport=transport)
def _get_url_timestamp(self):
"""Generate the Engine.IO query string timestamp."""
return '&t=' + str(time.time())