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Re: Request handling using routes, containers, (internal) services

On 06/22/2015 02:53 PM, Erik Huelsmann wrote:
Chris, John,

In the other thread, John mentioned the structure that web apps are growing to in general to have these components to facilitate growth beyond a certain size:

So... the patterns we're discussing I'm seeing put in widespread use. I'd say those 3 things are crucial for us to define/decide how we're going to implement (and perhaps find some Perl framework to assist if those we're currently using are insufficient):

* Request routing
* Service container to make it easy to register and load services
* Response object (which needs to include the definition of how to return exceptions).

So, I'm now thinking how we can apply these concepts to LedgerSMB with or without the context of using Plack and/or Starman. I'm imagining that we will have to handle a certain amount of it ourselves internally and that we possibly could hand off some of it to Plack's middleware modules.

What I've been thinking about for some time now is that we might want to virtualize our current module names 'aa.pl' etc. into routes. For aa.pl, there really are physical files, but for other routes, we may not want to handle the route processing the same way.

Is this something that we need to address "now" (as in: design it asap and simply continue working on the code base, but use this as a paradigm for all code that's being (re)written)?

I don't have an answer to that specific question...

But most webapps I've worked with have a single endpoint that receives all requests. The webserver reroutes any paths that don't exist on the disk to that endpoint.

Given that all of those little module name endpoints we currently have are copies of one of two different actual endpoints, it does seem like we should be able to pretty easily eliminate those... and just make the single remaining endpoint smart enough to know which way to handle the request...

I would assume Starman could handle something like that?

For Drupal, Apache first looks for a file on the disk... if it doesn't exist, it rewrites the path to /index.php?q= (and then adds the original path). This is done internally, not as a redirect, so the browser never knows...

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