OpenSlides/server/tests/integration/websocket.py

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import json
import lz4.frame
from channels.testing import WebsocketCommunicator as ChannelsWebsocketCommunicator
class WebsocketCommunicator(ChannelsWebsocketCommunicator):
"""
Implements decompression when receiving JSON data.
"""
async def receive_json_from(self, timeout=1):
"""
Receives a JSON text frame or a compressed JSON bytes object, decompresses and decodes it
"""
payload = await self.receive_from(timeout)
if isinstance(payload, bytes):
# try to decompress the message
uncompressed_data = lz4.frame.decompress(payload)
text_data = uncompressed_data.decode("utf-8")
else:
text_data = payload
assert isinstance(text_data, str), "JSON data is not a text frame"
return json.loads(text_data)
async def assert_receive_error(self, timeout=1, in_response=None, **kwargs):
response = await self.receive_json_from(timeout)
assert response["type"] == "error"
content = response.get("content")
if kwargs:
assert content
for key, value in kwargs.items():
assert content.get(key) == value
if in_response:
assert response["in_response"] == in_response