Code import
This commit is contained in:
Jan Groß
290
venv/lib/python2.7/site-packages/engineio/asyncio_server.py
Normal file
290
venv/lib/python2.7/site-packages/engineio/asyncio_server.py
Normal file
@@ -0,0 +1,290 @@
|
||||
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 async_handlers: If set to ``True``, run message event handlers in
|
||||
non-blocking threads. To run handlers synchronously,
|
||||
set to ``False``. The default is ``True``.
|
||||
: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:
|
||||
try:
|
||||
socket = self._get_socket(sid)
|
||||
except KeyError: # pragma: no cover
|
||||
# the socket was already closed or gone
|
||||
pass
|
||||
else:
|
||||
await socket.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: # pragma: no cover
|
||||
# for any other unexpected errors, we log the error
|
||||
# and keep going
|
||||
self.logger.exception('post request handler error')
|
||||
r = self._ok()
|
||||
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)
|
||||
|
||||
ret = await 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 = 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."""
|
||||
run_async = kwargs.pop('run_async', False)
|
||||
ret = None
|
||||
if event in self.handlers:
|
||||
if asyncio.iscoroutinefunction(self.handlers[event]) is True:
|
||||
if run_async:
|
||||
return self.start_background_task(self.handlers[event],
|
||||
*args)
|
||||
else:
|
||||
try:
|
||||
ret = await self.handlers[event](*args)
|
||||
except asyncio.CancelledError: # pragma: no cover
|
||||
pass
|
||||
except:
|
||||
self.logger.exception(event + ' async handler error')
|
||||
if event == 'connect':
|
||||
# if connect handler raised error we reject the
|
||||
# connection
|
||||
return False
|
||||
else:
|
||||
if run_async:
|
||||
async def async_handler():
|
||||
return self.handlers[event](*args)
|
||||
|
||||
return self.start_background_task(async_handler)
|
||||
else:
|
||||
try:
|
||||
ret = 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
|
||||
return ret
|
||||
Reference in New Issue
Block a user