[asterisk-dev] [Code Review] 2754: ARI: WebSocket event cleanup

[Matt Jordan]

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Ship it!


Ship It!

- Matt Jordan


On Aug. 16, 2013, 3:52 p.m., David Lee wrote:
> 
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> https://reviewboard.asterisk.org/r/2754/
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> (Updated Aug. 16, 2013, 3:52 p.m.)
> 
> 
> Review request for Asterisk Developers and Matt Jordan.
> 
> 
> Bugs: ASTERISK-21969
>     https://issues.asterisk.org/jira/browse/ASTERISK-21969
> 
> 
> Repository: Asterisk
> 
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> Description
> -------
> 
> Stasis events (which get distributed over the ARI WebSocket) are created
> by subscribing to the channel_all_cached and bridge_all_cached topics,
> filtering out events for channels/bridges currently subscribed to.
> 
> There are two issues with that. First was a race condition, where
> messages in-flight to the master subscribe-to-all-things topic would get
> sent out, even though the events happened before the channel was put
> into Stasis. Secondly, as the number of channels and bridges grow in the
> system, the work spent filtering messages becomes excessive.
> 
> Since r395954, individual channels and bridges have caching topics, and
> can be subscribed to individually. This patch takes advantage, so that
> channels and bridges are subscribed to on demand, instead of filtering
> the global topics.
> 
> The one case where filtering is still required is handling BridgeMerge
> messages, which are published directly to the bridge_all topic.
> 
> Other than the change to how subscriptions work, this patch mostly just
> moves code around. Most of the work generating JSON objects from
> messages was moved to .to_json handlers on the message types. The
> callback functions handling app subscriptions were moved from res_stasis
> (b/c they were global to the model) to stasis/app.c (b/c they are local
> to the app now).
> 
> 
> Diffs
> -----
> 
>   /trunk/main/stasis_bridges.c 396841 
>   /trunk/res/res_ari_asterisk.c 396841 
>   /trunk/res/res_ari_bridges.c 396841 
>   /trunk/res/res_ari_events.c 396841 
>   /trunk/res/res_stasis.c 396841 
>   /trunk/res/stasis/app.h 396841 
>   /trunk/res/stasis/app.c 396841 
>   /trunk/rest-api-templates/param_parsing.mustache 396841 
>   /trunk/rest-api-templates/res_ari_resource.c.mustache 396841 
> 
> Diff: https://reviewboard.asterisk.org/r/2754/diff/
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> 
> Testing
> -------
> 
> Put channels in/out of Stasis, and in/out of bridges, watching events on the
> WebSocket.
> 
> 
> Thanks,
> 
> David Lee
> 
>

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