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

[Mark Michelson]

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Ship it!


Ship It!

- Mark Michelson


On Feb. 20, 2015, 3:39 p.m., David Lee wrote:
> 
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> https://reviewboard.asterisk.org/r/4431/
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> (Updated Feb. 20, 2015, 3:39 p.m.)
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> 
> Review request for Asterisk Developers.
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> Repository: Asterisk
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> Description
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> 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
> segments).
> 
> 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".
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> This patch also properly logs EOF conditions, so disconnects are no
> longer confused with unresponsive connections.
> 
>  [chan_respoke]: https://github.com/respoke/chan_respoke
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> 
> Diffs
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>   /branches/11/res/res_http_websocket.c 431915 
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> Diff: https://reviewboard.asterisk.org/r/4431/diff/
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> 
> Testing
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> 
> Ran a Node app that continuously send large WebSocket frame to Asterisk.
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> https://gist.github.com/leedm777/ba6d86468d7646073286
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> Without the patch, Asterisk fails in less than 10 frames. With the patch, it runs like a boss.
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> 
> Thanks,
> 
> David Lee
> 
>

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