Hello everyone,
I need to write a rather large web app using Pylons.
I'm trying to work out if it could be written as a series of plugins,
some of them realizing "core" functions, and some being addons, e.g.
Email Management or FTP Management would be core plugins and Accounting
could be a third-party plugin, working e.g. with FTP Management to
calculate e.g. bandwidth used by FTP.
To give you some idea why I would try to do it this way:
1. Modularity. Separating, say, Accounting from Email Management makes
sense on an architectural level.
2. Extensibility by third parties. In order not to end up with
unmaintainable mess, communication between plugins should be handled via
some service interface over some sort of established protocol (I think).
I was thinking that even the main page could just be a display page for
content produced by particular plugins (would template inheritance in
Mako be useful for this?).
I found this:
http://wiki.pylonshq.com/display/pylonscookbook/Using+Entry+Points+to+Write+Plugins
But I'm not sure eggs would suffice: I would like to be able to register
plugins dynamically while the Pylons app is running and to be able to
dynamically create pages querying plugins from somewhere (the plugin
data could even be contained in SQLA backend). Say, the main app page
queries plugin list, and asks each plugin to create HTML content for its
part of the page in specified context (say, 'mainpage'), then displays
the whole thing. One thing that worries me a bit in such context would
be an overhead.
I do realize that in this case Pylons becomes sort of meta-framework,
and frankly I have no idea if this would work well, or if the whole
thing would just collapse in flames.
How would you approach doing smth like this in Pylons? Is it even a good
idea?
So far I've written only "hello world" sort of apps in Pylons (I wrote
quite a bit in straight mod_python using Mako and SQLA as components),
so I would appreciate the thoughts on the subject of people who have had
more experience with implementing actual apps in Pylons than I have.
Regards,
mk
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