[Python] How can I check the Websocket data is empty by using asyncio

I am use python asyncio to create a websocket client, however, when I try the following code, it hangs up

message = b''
while True:
print(11111)
chunk = await reader.read(1024)
print(len(chunk))
self.message += chunk
print(self.connection['reader'].at_eof())
if not chunk:
break
print('eeeeeeee')


However, it hangs up and output:

11111

35

False

How can I check if the buffer is end?

Continue reading...