[asterisk-dev] [Code Review] 4431: Increase WebSocket frame size and improve large read handling

David Lee reviewboard at asterisk.org
Fri Feb 20 09:39:34 CST 2015

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(Updated Feb. 20, 2015, 9:39 a.m.)

Review request for Asterisk Developers.



Repository: Asterisk


Some WebSocket applications, like [chan_respoke][], require a larger
frame size than the default 8k; this patch bumps the default to 16k.
This patch also fixes some problems exacerbated by large frames.

The sanity counter was decremented on every fread attempt in
ws_safe_read(), regardless of whether data was read from the socket or
not. For large frames, this could result in loss of sanity prior to
reading the entire frame. (16k frame / 1448 bytes per segment = 12

This patch changes the sanity counter so that it only decrements when
fread() doesn't read any bytes. This more closely matches the original
intention of ws_safe_read(), given that the error message is
"Websocket seems unresponsive".

This patch also properly logs EOF conditions, so disconnects are no
longer confused with unresponsive connections.

 [chan_respoke]: https://github.com/respoke/chan_respoke

Diffs (updated)

  /branches/11/res/res_http_websocket.c 431915 

Diff: https://reviewboard.asterisk.org/r/4431/diff/


Ran a Node app that continuously send large WebSocket frame to Asterisk.


Without the patch, Asterisk fails in less than 10 frames. With the patch, it runs like a boss.


David Lee

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