In my production environment, new web2py apps are installed every day.
In fact, it is the same app that it is installed several times with a
different name.
Each installed application corresponds to a website that has its own domain.
In the root folder of web2py, I have a file called "domains_apps" where I
store which domain corresponds to which application.
The file looks like this:
domain1.com!app1
domain2.com!app2
domain3.com!app3
Then, in my routes.py file I read the domains_apps file to construct the
"domains" dictionary that is provided for the routers.
My routes.py file looks like this:
# -*- coding: utf-8 -*-
domains = {}
archivo = open('domains_apps', 'r')
lines = archivo.readlines()
archivo.close()
for line in lines:
if line:
domain, app = line.split('!')
if domain and app:
domains[domain] = app
routers = dict(
BASE=dict(
default_controller='default',
default_function='index',
domains=domains,
root_static=['robots.txt', 'ads.txt'],
map_static=True,
exclusive_domain=True,
)
)
This works smoothly.
Now I'm trying to add a checkpoint: before adding an domain/app, I would
like to check that the application is indeed installed in web2py. *How do I
do that?*
I've tried checking if the folder exists inside applications folder, but it
doesn't work (I created an empty dir and it does pass the validation, but
then web2py throws an error saying application doesn't exist).
I've also tried checking if the folder exists and it has an __init__.py
file inside it, but it doesn't work (again, I tried creating a folder with
an __init__.py file inside, it passes validation but web2py throws error
saying application doesn't exist).
You may wonder why do I need to check that in routes.py?
Well, as applications are installed/removed by an external process,
something could break during this process. And if for some reason my
domains_apps file ends up including an application that was removed, my
uWSGI instance will fail loading the application, and all my requests will
fail.
So, considering the routes.py I previously showed, how can I check if an
application exists?
Does this approach make any sense?
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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