How to close a secure websocket correctly

[wenwenchenbosch]

I implemented a websocket client using this library. But after I closing the secure connection by the client side, I always get the error from server side:

ERROR: read: stream truncated

which means that the client closed the connection abruptly. The question is, how to close a websocket correctly. I called close() function. But I still got the error.

[aaugustin]

Hard to answer tell without seeing the content of testclient.py. Could you provide it?

[wenwenchenbosch]

Hard to answer tell without seeing the content of testclient.py. Could you provide it?

thanks for quick reply. Sorry for providing a non-public repository. You can now find the code unter https://github.com/eclipse/kuksa.val/blob/7b55bbfaa30117a5fc3e157011ab5c3704100928/clients/common/clientComm.py#L116, which should be public.

[mdavis-xyz]

So you're calling .close() on the object returned by .connect()?

I'm doing the same thing, and getting a different error:

code = 1006 (connection closed abnormally [internal]), no reason

[mdavis-xyz]

There is documentation here

How do I close a connection properly?
websockets takes care of closing the connection when the handler exits.

What is a "handler"? Does that mean the asyncio coroutine?

My use case is that I want to connect a client for a fixed amount of time, then have the client close the connection cleanly.

[aaugustin]

client = await websockets.connect()

# when you want to close

await client.close()

Perhaps you forgot to await the close coroutine?

[wenwenchenbosch]

I used await, see

https://github.com/eclipse/kuksa.val/blob/061fe1dd4be5092c605af410162e420d49cbd049/kuksa_viss_client/__init__.py#L165

[aaugustin]

The example/secure_server.py and example/secure_client.py files the repository don't have this problem.

If you can give me an easy way to reproduce — which is likely to require access to a test server :-/ — maybe I can investigate. Otherwise there's nothing more I can do with the error message.