Something always bothered be and resulted in lots of uglyness. I
suspected there was a way to fix it but did not know. Now I found out.
The problem:
==========
when we do
import a.b.c as d
Python (and web2py) look in sys.path.
If the module is in "web2py/applications/yourapp/modules" then
"web2py/applications/yourapp/modules" should be added to sys.path.
This would cause a major problem if there are many web2py apps that
have a file a/b/c.py in modules. The import would find the first one,
not necessarily the one in the current app.
sys.path is not thread safe. There only a global sys.path not one per
thread.
So far the suggested solution was not do add the app modules path to
sys.path and instead we used to do:
exec('import applications.%s.modules.a.b.c as d' %
request.application) # UGLY!
This solves the conflict between app of modules but not conflicts with
modules that are in sys.path.
This limits which modules can go in the app modules/ folder because
modules that user absolute imports cannot find their dependencies.
This does not reload modules and one is forced to user conditional
reloads when debugging modules.
The solution
=========
I found and implemented a better way. With the code in trunk we can
now do:
d = local_import('a.b.c')
- it is not based on exec
- it searches in applicaitons/currentapp/modules/ before searching in
sys.path so no conflicts ever
- each modules/ folder acts like its own site-packages and you can put
any third party module in there whether or not is uses relative
imports
- you can ask it force reloading modules at every request, great for
debugging modules:
d = local_import('a.b.c', force=True)
This opens the door to better plugins implemented (partially) as
modules.
Please check it out and report any success/failure. If ok it will be
in 1.70.1
Massimo
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