303 lines
9.9 KiB
Python
303 lines
9.9 KiB
Python
import json
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import logging
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import re
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import requests
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import socket
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import time
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import websocket
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from itertools import izip
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from .exceptions import SocketIOError, SocketIOConnectionError, _TimeoutError
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TRANSPORTS = 'websocket', 'xhr-polling', 'jsonp-polling'
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BOUNDARY = u'\ufffd'.encode('utf-8')
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TIMEOUT_IN_SECONDS = 2
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_log = logging.getLogger(__name__)
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class _AbstractTransport(object):
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def __init__(self):
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self._packet_id = 0
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self._callback_by_packet_id = {}
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def disconnect(self, path=''):
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if not self.connected:
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return
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if path:
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self.send_packet(0, path)
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else:
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self.close()
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def connect(self, path):
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self.send_packet(1, path)
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def send_heartbeat(self):
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self.send_packet(2)
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def message(self, path, data, callback):
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if isinstance(data, basestring):
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code = 3
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else:
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code = 4
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data = json.dumps(data, ensure_ascii=False)
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self.send_packet(code, path, data, callback)
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def emit(self, path, event, args, callback):
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data = json.dumps(dict(name=event, args=args), ensure_ascii=False)
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self.send_packet(5, path, data, callback)
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def ack(self, packet_id, *args):
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packet_id = packet_id.rstrip('+')
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data = '%s+%s' % (
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packet_id,
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json.dumps(args, ensure_ascii=False),
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) if args else packet_id
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self.send_packet(6, data=data)
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def noop(self):
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self.send_packet(8)
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def send_packet(self, code, path='', data='', callback=None):
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packet_id = self.set_ack_callback(callback) if callback else ''
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packet_parts = str(code), packet_id, path, data
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packet_text = ':'.join(packet_parts)
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self.send(packet_text)
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_log.debug('[packet sent] %s', packet_text)
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def recv_packet(self):
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code, packet_id, path, data = None, None, None, None
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for packet_text in self.recv():
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_log.debug('[packet received] %s', packet_text)
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try:
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packet_parts = packet_text.split(':', 3)
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except AttributeError:
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_log.warn('[packet error] %s', packet_text)
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continue
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packet_count = len(packet_parts)
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if 4 == packet_count:
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code, packet_id, path, data = packet_parts
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elif 3 == packet_count:
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code, packet_id, path = packet_parts
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elif 1 == packet_count:
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code = packet_parts[0]
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yield code, packet_id, path, data
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def set_ack_callback(self, callback):
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'Set callback to be called after server sends an acknowledgment'
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self._packet_id += 1
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self._callback_by_packet_id[str(self._packet_id)] = callback
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return '%s+' % self._packet_id
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def get_ack_callback(self, packet_id):
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'Get callback to be called after server sends an acknowledgment'
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callback = self._callback_by_packet_id[packet_id]
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del self._callback_by_packet_id[packet_id]
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return callback
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@property
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def has_ack_callback(self):
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return True if self._callback_by_packet_id else False
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class _WebsocketTransport(_AbstractTransport):
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def __init__(self, socketIO_session, secure, base_url, **kw):
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super(_WebsocketTransport, self).__init__()
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url = '%s://%s/websocket/%s' % (
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'wss' if secure else 'ws',
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base_url, socketIO_session.id)
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try:
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self._connection = websocket.create_connection(url)
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except socket.timeout as e:
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raise SocketIOConnectionError(e)
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except socket.error as e:
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raise SocketIOConnectionError(e)
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self._connection.settimeout(TIMEOUT_IN_SECONDS)
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@property
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def connected(self):
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return self._connection.connected
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def send(self, packet_text):
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try:
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self._connection.send(packet_text)
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except socket.error:
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raise SocketIOConnectionError('could not send %s' % packet_text)
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def recv(self):
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try:
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yield self._connection.recv()
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except socket.timeout:
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raise _TimeoutError
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except socket.error as e:
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raise SocketIOConnectionError(e)
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except websocket.WebSocketConnectionClosedException as e:
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raise SocketIOConnectionError('connection closed (%s)' % e)
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def close(self):
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self._connection.close()
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class _XHR_PollingTransport(_AbstractTransport):
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def __init__(self, socketIO_session, secure, base_url, **kw):
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super(_XHR_PollingTransport, self).__init__()
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self._url = '%s://%s/xhr-polling/%s' % (
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'https' if secure else 'http',
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base_url, socketIO_session.id)
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self._connected = True
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self._http_session = _prepare_http_session(kw)
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# Create connection
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for packet_text in self.recv_packet():
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pass
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@property
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def connected(self):
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return self._connected
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@property
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def _params(self):
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return dict(t=int(time.time()))
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def send(self, packet_text):
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_get_response(
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self._http_session.post,
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self._url,
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params=self._params,
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data=packet_text,
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timeout=TIMEOUT_IN_SECONDS)
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def recv(self):
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response = _get_response(
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self._http_session.get,
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self._url,
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params=self._params,
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timeout=TIMEOUT_IN_SECONDS)
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encoded_text = response.text.encode('utf-8')
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if not encoded_text.startswith(BOUNDARY):
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yield encoded_text.decode('utf-8')
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for packet_text in _yield_text_from_framed_data(encoded_text):
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yield packet_text
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def close(self):
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_get_response(
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self._http_session.get,
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self._url,
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params=dict(self._params.items() + [('disconnect', True)]))
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self._connected = False
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class _JSONP_PollingTransport(_AbstractTransport):
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DATA_PATTERN = re.compile(r'io.j\[(\d+)\]\("(.*)"\);')
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def __init__(self, socketIO_session, secure, base_url, **kw):
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super(_JSONP_PollingTransport, self).__init__()
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self._url = '%s://%s/jsonp-polling/%s' % (
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'https' if secure else 'http',
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base_url, socketIO_session.id)
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self._connected = True
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self._http_session = _prepare_http_session(kw)
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self._id = 0
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# Create connection
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for packet_text in self.recv_packet():
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pass
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@property
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def connected(self):
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return self._connected
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@property
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def _params(self):
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return dict(t=int(time.time()), i=self._id)
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def send(self, packet_text):
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_get_response(
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self._http_session.post,
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self._url,
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params=self._params,
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data='d=%s' % requests.utils.quote(packet_text),
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headers={'content-type': 'application/x-www-form-urlencoded'},
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timeout=TIMEOUT_IN_SECONDS)
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def recv(self):
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response = _get_response(
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self._http_session.get,
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self._url,
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params=self._params,
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headers={'content-type': 'text/javascript; charset=UTF-8'},
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timeout=TIMEOUT_IN_SECONDS)
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encoded_text = response.text.encode('utf-8')
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if not encoded_text.startswith(BOUNDARY):
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self._id, encoded_data = self.DATA_PATTERN.match(
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encoded_text).groups()
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yield encoded_data.decode('utf-8')
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for packet_text in _yield_text_from_framed_data(encoded_text):
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yield packet_text
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def close(self):
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_get_response(
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self._http_session.get,
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self._url,
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params=dict(self._params.items() + [('disconnect', True)]))
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self._connected = False
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def _negotiate_transport(
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client_supported_transports, session,
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secure, base_url, **kw):
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server_supported_transports = session.server_supported_transports
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for supported_transport in client_supported_transports:
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if supported_transport in server_supported_transports:
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_log.debug('[transport selected] %s', supported_transport)
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return {
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'websocket': _WebsocketTransport,
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'xhr-polling': _XHR_PollingTransport,
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'jsonp-polling': _JSONP_PollingTransport,
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}[supported_transport](session, secure, base_url, **kw)
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raise SocketIOError(' '.join([
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'could not negotiate a transport:',
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'client supports %s but' % ', '.join(client_supported_transports),
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'server supports %s' % ', '.join(server_supported_transports),
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]))
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def _yield_text_from_framed_data(framed_data):
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parts = [x.decode('utf-8') for x in framed_data.split(BOUNDARY)]
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for text_length, text in izip(parts[1::2], parts[2::2]):
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if text_length != str(len(text)):
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warning = 'invalid declared length=%s for packet_text=%s' % (
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text_length, text)
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_log.warn('[packet error] %s', warning)
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continue
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yield text
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def _get_response(request, *args, **kw):
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try:
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response = request(*args, **kw)
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except requests.exceptions.Timeout as e:
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raise _TimeoutError(e)
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except requests.exceptions.ConnectionError as e:
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raise SocketIOConnectionError(e)
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except requests.exceptions.SSLError as e:
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raise SocketIOConnectionError('could not negotiate SSL (%s)' % e)
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status = response.status_code
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if 200 != status:
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raise SocketIOConnectionError('unexpected status code (%s)' % status)
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return response
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def _prepare_http_session(kw):
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http_session = requests.Session()
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http_session.headers.update(kw.get('headers', {}))
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http_session.auth = kw.get('auth')
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http_session.proxies.update(kw.get('proxies', {}))
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http_session.hooks.update(kw.get('hooks', {}))
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http_session.params.update(kw.get('params', {}))
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http_session.verify = kw.get('verify')
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http_session.cert = kw.get('cert')
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http_session.cookies.update(kw.get('cookies', {}))
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return http_session
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