Re: [GMG-Devel] Plugin for page view counter

[Christopher Allan Webber]

Yes, you're right, celery is a better solution to processing these
things!

Nathan Yergler writes:

> I'd like to advocate for *not* doing a database write on a page view,
> particularly not one that's going to be subject to a high degree of
> lock contention on a higher traffic site. Write-on-GET should be a
> signal to think about things carefully, as it imposes a limit on how
> you can scale the software. If I recall correctly the stack still has
> Celery in it; tossing a job into the queue and accepting some latency
> with the stats isn't free, but it would reduce the amount of
> contention.
>
> Also keep in mind that either proxying the media file to trigger a
> stats increment, or embedding it in the HTML surrounding the media,
> mean you can't do any caching in front of the application: every
> request needs to hit the application server.
>
> Best,
>
> NRY
>
> On Mon, Jan 14, 2013 at 7:36 AM, Christopher Allan Webber
> <address@hidden> wrote:
>> Tiberiu C. Turbureanu writes:
>>
>>> Thanks for the pointer, Chris!
>>>
>>> I need a way to increment the view counter only when the media file is
>>> loaded. How can I achieve this?
>>
>> I'm not sure what you mean.  Do you mean:
>>  - only when the page is loaded
>>  - or something more complex: only if someone clicks "play" on a song or
>>    video?
>>
>> The solution I was talking about involves number one.  As for number
>> two, that would be a lot more complex, but I imagine it could be
>> achieved via one of two things:
>>  - Easier solution: javascript callback on play that notifies the
>>    browser of playing starting.
>>  - Much, much trickier solution: you might be able to set up a proxy
>>    view before serving the actual video that first increments the file,
>>    but then tells the web server to send the video via X-Sendfile.  That
>>    sounds too complex to me though, and might be especially hard if a
>>    browser "seeks" the media to read just a few frames to get a preview
>>    image or do some preloading, which it might do in some
>>    configurations.
>>
>>> Also, Sebastian Spaeth told me that at the moment there is no way for a
>>> plugin to alter the template of the media page, but a hook mechanism is
>>> being discussed. That why until the implementation is ready, I think I
>>> will go for a new page under a route like this
>>> /u/<string:user>/m/<string:media>/viewcount.
>>
>> Spaetz is right, there's no present solution to this.  After I go
>> through my merge-a-thon this week though, I'll be switching onto some
>> plugin development, and will be looking into a solution to allow plugins
>> to extend pages more easily.
>>
>>  - Chris
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