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import asyncio
import six
from six.moves import urllib
from .exceptions import EngineIOError
from . import packet
from . import server
from . import asyncio_socket
class AsyncServer(server.Server):
"""An Engine.IO server for asyncio.
This class implements a fully compliant Engine.IO web server with support
for websocket and long-polling transports, compatible with the asyncio
framework on Python 3.5 or newer.
:param async_mode: The asynchronous model to use. See the Deployment
section in the documentation for a description of the
available options. Valid async modes are "aiohttp". If
this argument is not given, an async mode is chosen
based on the installed packages.
:param ping_timeout: The time in seconds that the client waits for the
server to respond before disconnecting.
:param ping_interval: The interval in seconds at which the client pings
the server.
:param max_http_buffer_size: The maximum size of a message when using the
polling transport.
:param allow_upgrades: Whether to allow transport upgrades or not.
:param http_compression: Whether to compress packages when using the
polling transport.
:param compression_threshold: Only compress messages when their byte size
is greater than this value.
:param cookie: Name of the HTTP cookie that contains the client session
id. If set to ``None``, a cookie is not sent to the client.
:param cors_allowed_origins: List of origins that are allowed to connect
to this server. All origins are allowed by
default.
:param cors_credentials: Whether credentials (cookies, authentication) are
allowed in requests to this server.
:param logger: To enable logging set to ``True`` or pass a logger object to
use. To disable logging set to ``False``.
:param json: An alternative json module to use for encoding and decoding
packets. Custom json modules must have ``dumps`` and ``loads``
functions that are compatible with the standard library
versions.
:param kwargs: Reserved for future extensions, any additional parameters
given as keyword arguments will be silently ignored.
"""
def is_asyncio_based(self):
return True
def async_modes(self):
return ['aiohttp', 'sanic']
def attach(self, app, engineio_path='engine.io'):
"""Attach the Engine.IO server to an application."""
engineio_path = engineio_path.strip('/')
self._async['create_route'](app, self, '/{}/'.format(engineio_path))
async def send(self, sid, data, binary=None):
"""Send a message to a client.
:param sid: The session id of the recipient client.
:param data: The data to send to the client. Data can be of type
``str``, ``bytes``, ``list`` or ``dict``. If a ``list``
or ``dict``, the data will be serialized as JSON.
:param binary: ``True`` to send packet as binary, ``False`` to send
as text. If not given, unicode (Python 2) and str
(Python 3) are sent as text, and str (Python 2) and
bytes (Python 3) are sent as binary.
Note: this method is a coroutine.
"""
try:
socket = self._get_socket(sid)
except KeyError:
# the socket is not available
self.logger.warning('Cannot send to sid %s', sid)
return
await socket.send(packet.Packet(packet.MESSAGE, data=data,
binary=binary))
async def disconnect(self, sid=None):
"""Disconnect a client.
:param sid: The session id of the client to close. If this parameter
is not given, then all clients are closed.
Note: this method is a coroutine.
"""
if sid is not None:
await self._get_socket(sid).close()
del self.sockets[sid]
else:
await asyncio.wait([client.close()
for client in six.itervalues(self.sockets)])
self.sockets = {}
async def handle_request(self, *args, **kwargs):
"""Handle an HTTP request from the client.
This is the entry point of the Engine.IO application. This function
returns the HTTP response to deliver to the client.
Note: this method is a coroutine.
"""
environ = self._async['translate_request'](*args, **kwargs)
method = environ['REQUEST_METHOD']
query = urllib.parse.parse_qs(environ.get('QUERY_STRING', ''))
if 'j' in query:
self.logger.warning('JSONP requests are not supported')
r = self._bad_request()
else:
sid = query['sid'][0] if 'sid' in query else None
b64 = False
if 'b64' in query:
if query['b64'][0] == "1" or query['b64'][0].lower() == "true":
b64 = True
if method == 'GET':
if sid is None:
transport = query.get('transport', ['polling'])[0]
if transport != 'polling' and transport != 'websocket':
self.logger.warning('Invalid transport %s', transport)
r = self._bad_request()
else:
r = await self._handle_connect(environ, transport,
b64)
else:
if sid not in self.sockets:
self.logger.warning('Invalid session %s', sid)
r = self._bad_request()
else:
socket = self._get_socket(sid)
try:
packets = await socket.handle_get_request(environ)
if isinstance(packets, list):
r = self._ok(packets, b64=b64)
else:
r = packets
except EngineIOError:
if sid in self.sockets: # pragma: no cover
await self.disconnect(sid)
r = self._bad_request()
if sid in self.sockets and self.sockets[sid].closed:
del self.sockets[sid]
elif method == 'POST':
if sid is None or sid not in self.sockets:
self.logger.warning('Invalid session %s', sid)
r = self._bad_request()
else:
socket = self._get_socket(sid)
try:
await socket.handle_post_request(environ)
r = self._ok()
except EngineIOError:
if sid in self.sockets: # pragma: no cover
await self.disconnect(sid)
r = self._bad_request()
except Exception as e:
# for any other unexpected errors, we disconnect
# the cient and reraise
print('yo')
if sid in self.sockets: # pragma: no cover
await self.disconnect(sid)
raise e
else:
self.logger.warning('Method %s not supported', method)
r = self._method_not_found()
if not isinstance(r, dict):
return r or []
if self.http_compression and \
len(r['response']) >= self.compression_threshold:
encodings = [e.split(';')[0].strip() for e in
environ.get('HTTP_ACCEPT_ENCODING', '').split(',')]
for encoding in encodings:
if encoding in self.compression_methods:
r['response'] = \
getattr(self, '_' + encoding)(r['response'])
r['headers'] += [('Content-Encoding', encoding)]
break
cors_headers = self._cors_headers(environ)
return self._async['make_response'](r['status'],
r['headers'] + cors_headers,
r['response'])
def start_background_task(self, target, *args, **kwargs):
"""Start a background task using the appropriate async model.
This is a utility function that applications can use to start a
background task using the method that is compatible with the
selected async mode.
:param target: the target function to execute.
:param args: arguments to pass to the function.
:param kwargs: keyword arguments to pass to the function.
The return value is a ``asyncio.Task`` object.
"""
return asyncio.ensure_future(target(*args, **kwargs))
async def sleep(self, seconds=0):
"""Sleep for the requested amount of time using the appropriate async
model.
This is a utility function that applications can use to put a task to
sleep without having to worry about using the correct call for the
selected async mode.
Note: this method is a coroutine.
"""
return await asyncio.sleep(seconds)
async def _handle_connect(self, environ, transport, b64=False):
"""Handle a client connection request."""
sid = self._generate_id()
s = asyncio_socket.AsyncSocket(self, sid)
self.sockets[sid] = s
pkt = packet.Packet(
packet.OPEN, {'sid': sid,
'upgrades': self._upgrades(sid, transport),
'pingTimeout': int(self.ping_timeout * 1000),
'pingInterval': int(self.ping_interval * 1000)})
await s.send(pkt)
reraise_exc = None
try:
ret = await self._trigger_event('connect', sid, environ)
except Exception as e:
ret = False
reraise_exc = e
if ret is False:
del self.sockets[sid]
if reraise_exc is None:
self.logger.warning('Application rejected connection')
else:
self.logger.error('Connect handler raised an exception')
raise reraise_exc
return self._unauthorized()
if transport == 'websocket':
ret = await s.handle_get_request(environ)
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)]
return self._ok(await s.poll(), headers=headers, b64=b64)
async def _trigger_event(self, event, *args, **kwargs):
"""Invoke an event handler."""
ret = None
if event in self.handlers:
if asyncio.iscoroutinefunction(self.handlers[event]) is True:
try:
ret = await self.handlers[event](*args)
except asyncio.CancelledError: # pragma: no cover
pass
else:
ret = self.handlers[event](*args)
return ret