def signal_call(request, signal):
""" Called by JS code when websockets are not available. Allow to call Python signals from JS.
Arguments are passed in the request body, serialized as JSON.
:param signal: name of the called signal
:type signal: :class:`str`
"""
import_signals()
if request.body:
kwargs = json.loads(request.body.decode('utf-8'), cls=get_signal_decoder())
else:
kwargs = {}
try:
result = df_call(signal, request, sharing=RETURN, from_client=True, kwargs=kwargs)
except InvalidRequest:
result = []
return JsonResponse(result, safe=False, encoder=get_signal_encoder())
def publish_message(self, message, expire=None):
"""
Publish a ``message`` on the subscribed channel on the Redis datastore.
``expire`` sets the time in seconds, on how long the message shall additionally of being
published, also be persisted in the Redis datastore. If unset, it defaults to the
configuration settings ``WS4REDIS_EXPIRE``.
"""
# noinspection PyUnusedLocal
expire = expire
if not isinstance(message, RedisMessage):
raise ValueError('message object is not of type RedisMessage')
if self._publishers != self.internal_publishers:
return
# noinspection PyBroadException
try:
message_dict = json.loads(message.decode('utf-8'), cls=get_signal_decoder())
df_call(message_dict['signal'], self.request, sharing=None, from_client=True, kwargs=message_dict['options'])
except ApiException as e:
df_call('df.messages.error', self.request, sharing=SESSION, from_client=True, kwargs={'html': _('Error: %(msg)s') % {'msg': force_text(e)}})
except Exception as e:
df_call('df.messages.error', self.request, sharing=SESSION, from_client=True, kwargs={'html': _('Invalid websocket message: %(msg)s.') % {'msg': force_text(e)}})