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import requests
import six
import ssl
import threading
import time
from six.moves.urllib.parse import urlencode as format_query
from six.moves.urllib.parse import urlparse as parse_url
from socket import error as SocketError
try:
from websocket import (
WebSocketConnectionClosedException, WebSocketTimeoutException,
create_connection)
except ImportError:
exit("""\
An incompatible websocket library is conflicting with the one we need.
You can remove the incompatible library and install the correct one
by running the following commands:
yes | pip uninstall websocket websocket-client
pip install -U websocket-client""")
from .exceptions import ConnectionError, TimeoutError
from .parsers import (
encode_engineIO_content, decode_engineIO_content,
format_packet_text, parse_packet_text)
from .symmetries import SSLError, memoryview
ENGINEIO_PROTOCOL = 3
TRANSPORTS = 'xhr-polling', 'websocket'
class AbstractTransport(object):
def __init__(self, http_session, is_secure, url, engineIO_session=None):
self.http_session = http_session
self.is_secure = is_secure
self.url = url
self.engineIO_session = engineIO_session
def recv_packet(self):
pass
def send_packet(self, engineIO_packet_type, engineIO_packet_data=''):
pass
def set_timeout(self, seconds=None):
pass
class XHR_PollingTransport(AbstractTransport):
def __init__(self, http_session, is_secure, url, engineIO_session=None):
super(XHR_PollingTransport, self).__init__(
http_session, is_secure, url, engineIO_session)
self._params = {
'EIO': ENGINEIO_PROTOCOL, 'transport': 'polling'}
if engineIO_session:
self._request_index = 1
self._kw_get = dict(
timeout=engineIO_session.ping_timeout)
self._kw_post = dict(
timeout=engineIO_session.ping_timeout,
headers={'content-type': 'application/octet-stream'})
self._params['sid'] = engineIO_session.id
else:
self._request_index = 0
self._kw_get = {}
self._kw_post = {}
http_scheme = 'https' if is_secure else 'http'
self._http_url = '%s://%s/' % (http_scheme, url)
self._request_index_lock = threading.Lock()
self._send_packet_lock = threading.Lock()
def recv_packet(self):
params = dict(self._params)
params['t'] = self._get_timestamp()
response = get_response(
self.http_session.get,
self._http_url,
params=params,
**self._kw_get)
for engineIO_packet in decode_engineIO_content(response.content):
engineIO_packet_type, engineIO_packet_data = engineIO_packet
yield engineIO_packet_type, engineIO_packet_data
def send_packet(self, engineIO_packet_type, engineIO_packet_data=''):
with self._send_packet_lock:
params = dict(self._params)
params['t'] = self._get_timestamp()
data = encode_engineIO_content([
(engineIO_packet_type, engineIO_packet_data),
])
get_response(
self.http_session.post,
self._http_url,
params=params,
data=memoryview(data),
**self._kw_post)
def _get_timestamp(self):
with self._request_index_lock:
timestamp = '%s-%s' % (
int(time.time() * 1000), self._request_index)
self._request_index += 1
return timestamp
class WebsocketTransport(AbstractTransport):
def __init__(self, http_session, is_secure, url, engineIO_session=None):
super(WebsocketTransport, self).__init__(
http_session, is_secure, url, engineIO_session)
params = dict(http_session.params, **{
'EIO': ENGINEIO_PROTOCOL, 'transport': 'websocket'})
request = http_session.prepare_request(requests.Request('GET', url))
kw = {'header': ['%s: %s' % x for x in request.headers.items()]}
if engineIO_session:
params['sid'] = engineIO_session.id
kw['timeout'] = self._timeout = engineIO_session.ping_timeout
ws_url = '%s://%s/?%s' % (
'wss' if is_secure else 'ws', url, format_query(params))
http_scheme = 'https' if is_secure else 'http'
if http_scheme in http_session.proxies: # Use the correct proxy
proxy_url_pack = parse_url(http_session.proxies[http_scheme])
kw['http_proxy_host'] = proxy_url_pack.hostname
kw['http_proxy_port'] = proxy_url_pack.port
if proxy_url_pack.username:
kw['http_proxy_auth'] = (
proxy_url_pack.username, proxy_url_pack.password)
if http_session.verify:
if http_session.cert: # Specify certificate path on disk
if isinstance(http_session.cert, six.string_types):
kw['ca_certs'] = http_session.cert
else:
kw['ca_certs'] = http_session.cert[0]
else: # Do not verify the SSL certificate
kw['sslopt'] = {'cert_reqs': ssl.CERT_NONE}
try:
self._connection = create_connection(ws_url, **kw)
except Exception as e:
raise ConnectionError(e)
def recv_packet(self):
try:
packet_text = self._connection.recv()
except WebSocketTimeoutException as e:
raise TimeoutError('recv timed out (%s)' % e)
except SSLError as e:
raise ConnectionError('recv disconnected by SSL (%s)' % e)
except WebSocketConnectionClosedException as e:
raise ConnectionError('recv disconnected (%s)' % e)
except SocketError as e:
raise ConnectionError('recv disconnected (%s)' % e)
if not isinstance(packet_text, six.binary_type):
packet_text = packet_text.encode('utf-8')
engineIO_packet_type, engineIO_packet_data = parse_packet_text(
packet_text)
yield engineIO_packet_type, engineIO_packet_data
def send_packet(self, engineIO_packet_type, engineIO_packet_data=''):
packet = format_packet_text(engineIO_packet_type, engineIO_packet_data)
try:
self._connection.send(packet)
except WebSocketTimeoutException as e:
raise TimeoutError('send timed out (%s)' % e)
except (SocketError, WebSocketConnectionClosedException) as e:
raise ConnectionError('send disconnected (%s)' % e)
def set_timeout(self, seconds=None):
self._connection.settimeout(seconds or self._timeout)
def get_response(request, *args, **kw):
try:
response = request(*args, stream=True, **kw)
except requests.exceptions.Timeout as e:
raise TimeoutError(e)
except requests.exceptions.ConnectionError as e:
raise ConnectionError(e)
except requests.exceptions.SSLError as e:
raise ConnectionError('could not negotiate SSL (%s)' % e)
status_code = response.status_code
if 200 != status_code:
raise ConnectionError('unexpected status code (%s %s)' % (
status_code, response.text))
return response
def prepare_http_session(kw):
http_session = requests.Session()
http_session.headers.update(kw.get('headers', {}))
http_session.auth = kw.get('auth')
http_session.proxies.update(kw.get('proxies', {}))
http_session.hooks.update(kw.get('hooks', {}))
http_session.params.update(kw.get('params', {}))
http_session.verify = kw.get('verify', True)
http_session.cert = _get_cert(kw)
http_session.cookies.update(kw.get('cookies', {}))
return http_session
def _get_cert(kw):
# Reduce (None, None) to None
cert = kw.get('cert')
if hasattr(cert, '__iter__') and cert[0] is None:
cert = None
return cert
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