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[EP-tech] Pins & EPrints::Apache::Template



Hi Chris and John,

Apologies for my delayed response; I was distracted last week by an
EPrints/Elements problem so I had to delay my EPrints exploring so I could
do my job (the inconvenience!).

Chris; Thank you for this, it makes much more sense. I'll take a more
thorough look through today now that last weeks drama is over.

John; thank you too, I'll add that to my reading list. One thing to be
encouraged by is that each time I read the various EPrints wiki pages I
somehow understand them a bit more. Which is a nice surprise as I spend
most of my time a bit confused!

Thanks,
James

On Fri, Sep 13, 2019 at 1:55 PM John Salter <J.Salter at leeds.ac.uk> wrote:

> As a side-comment, this might also be of use to understand some other
> parts of which might be involved with responses to some requests:
>
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwiki.eprints.org%2Fw%2FAnatomy_of_a_request&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7Cd3294949fef84c500b3408d740116cd0%7C4a5378f929f44d3ebe89669d03ada9d8%7C0&amp;sdata=DOiduicFWVO6nQ6G72WhZ%2BvM3nAXA2E3DhIWWSFuLVo%3D&amp;reserved=0
>
> - it took me a while to understand most of that - but I didn't dig into
> the details of the template as a response handler.
>
>
>
> It's also worth mentioning that the response handlers can be 'stacked' -
> you can have a queue of things that /could/ respond - with the first one
> that actually generates a response being the one that sends data to the
> browser
>
> More info about that layer of Apache/Perl here:
>
>
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fperl.apache.org%2Fdocs%2F2.0%2Fuser%2Fhandlers%2Fhttp.html%23PerlResponseHandler&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7Cd3294949fef84c500b3408d740116cd0%7C4a5378f929f44d3ebe89669d03ada9d8%7C0&amp;sdata=hcTtA687eqwIx62jXvYggG44pEJ82DqbB%2B1%2FyN9ujTk%3D&amp;reserved=0
>
>
>
> Cheers,
>
> John
>
>
>
>
>
> *From:* eprints-tech-bounces at ecs.soton.ac.uk [mailto:
> eprints-tech-bounces at ecs.soton.ac.uk] *On Behalf Of *Christ?pher
> Gutteridge via Eprints-tech
> *Sent:* 13 September 2019 12:51
> *To:* eprints-tech at ecs.soton.ac.uk; James Kerwin <jkerwin2101 at gmail.com>
> *Subject:* Re: [EP-tech] Pins & EPrints::Apache::Template
>
>
>
> It's set here:
>
>
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Feprints%2Feprints%2Fblob%2F3.3%2Fperl_lib%2FEPrints%2FApache%2FRewrite.pm%23L482&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7Cd3294949fef84c500b3408d740116cd0%7C4a5378f929f44d3ebe89669d03ada9d8%7C0&amp;sdata=N9XjB5myeADWEKjmPj1A3tci%2FEwpfv8e%2B8Lj2XRk4Oc%3D&amp;reserved=0
> <https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Feprints%2Feprints%2Fblob%2F3.3%2Fperl_lib%2FEPrints%2FApache%2FRewrite.pm%23L482&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7Cd3294949fef84c500b3408d740116cd0%7C4a5378f929f44d3ebe89669d03ada9d8%7C0&amp;sdata=N9XjB5myeADWEKjmPj1A3tci%2FEwpfv8e%2B8Lj2XRk4Oc%3D&amp;reserved=0>
>
> $r->set_handlers(PerlResponseHandler => [ 'EPrints::Apache::Template' ] );
>
> If the URL is not a document or EPrint URL, and ends in .html then apache
> is told to use that handler. See
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fperl.apache.org%2Fdocs%2F2.0%2Fuser%2Fhandlers%2Fhttp.html%23PerlResponseHandler&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7Cd3294949fef84c500b3408d740116cd0%7C4a5378f929f44d3ebe89669d03ada9d8%7C0&amp;sdata=hcTtA687eqwIx62jXvYggG44pEJ82DqbB%2B1%2FyN9ujTk%3D&amp;reserved=0
> <https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fperl.apache.org%2Fdocs%2F2.0%2Fuser%2Fhandlers%2Fhttp.html%23PerlResponseHandler&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7Cd3294949fef84c500b3408d740116cd0%7C4a5378f929f44d3ebe89669d03ada9d8%7C0&amp;sdata=hcTtA687eqwIx62jXvYggG44pEJ82DqbB%2B1%2FyN9ujTk%3D&amp;reserved=0>
>
> The term "pin" is short for lynchpin because that was the term for gaps
> you left in pre-prepared spells to fill them in at the time you cast them,
> in a roleplay system I was playing when I designed that bit of the system.
> It's not perfect, but it's not done badly as a solution for web templating.
>
> On 13/09/2019 12:36, James Kerwin via Eprints-tech wrote:
>
> Hi All,
>
>
>
> I've decided to go back and revisit pins to see how they work. Starting
> with the "main" pin in my repository default template:
>
>
>
> <epc:pin ref="page"/>
>
>
>
> According to the EPrints wiki Aprints:Apachec:Template.pm is what I want
> to look at. Going here I can see a sub:
>
>
>
> sub handler {
>
>
>
> This subroutine does STUFF to some filename and ends with a call to
> "prepare_page" which I assume prepares the page.
>
>
>
> Excuse me if this is really obvious or naive, but what causes "handler" to
> be called in the first instance? I've done so many greps and searched
> everywhere. I've even looked at bin/generate_static to see if that gives
> any clues. The notes in this module indicate that it's ran on server
> start-up, but does anybody know when "handler" is called? I want to see how
> the filenames are passed to handler.
>
>
>
> Thanks,
>
> James
>
>
>
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>
> --
>
> Christopher Gutteridge <totl at soton.ac.uk> <totl at soton.ac.uk>
>
> You should read our team blog at http://blog.soton.ac.uk/webteam/
>
>
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