Maybe I'm doing something silly...
I intend to run my code on GAE when I deploy it. For development and
testing, I use SQLite to work out most of the bugs and then I test on
GAE to find any GAE-specific bugs/issues. So I have some conditional
import statements in the web2py controller files, which detect when
the code is running on GAE and import two special GAE modules so that
my code will work properly. These are the lines that are at the top of
my controller, and they work properly for me:
# for caching datastore requests
if request.env.web2py_runtime_gae: # if running on Google App Engine
from gluon.contrib.gae_memcache import MemcacheClient
cache.ram=cache.disk=MemcacheClient(request)
#else: # we will use the normal web2py caching method's cache.ram
# for task queue support. we use this for offline processing for
insertion and aggregation
if request.env.web2py_runtime_gae: # if running on Google App Engine
from google.appengine.api.labs import taskqueue
import urllib
However, my code is getting more complex and I have some routines that
access the datastore that I would like to use in a few different
controller files. So I would like to put the re-usable code into a
custom module and then import that module into the controller files.
The problem I'm running into is that I'm getting errors when using
these conditional import statements at the top of my custom module,
because the request object is not defined. Do I need to put the import
statements INSIDE each function in my custom module, and pass the
request object to each function? Or is there a better way?
Maybe this is an easier way to ask this question: Is it possible to
use "@cache" function decorators in a custom module - in both the
typical web2py (running on SQLite) and GAE environments? If so, how
would I import the necessary libraries to get this to work?
Dan
On Jul 12, 7:24 pm, mdipierro <[email protected]> wrote:
> You can determine if it running on gae from
>
> request.env.web2py_runtime_gae
>
> You do not need any conditional import, perhaps I do not understand
> the question.
>
> On Jul 12, 8:40 pm, Dan <[email protected]> wrote:
>
> > Sorry, I'm afraid I'm still not getting it.
>
> > I can see how it would be possible to pass the request object to each
> > function within my custom module, and then decide if it's appropriate
> > to import the GAE-specific routines. This conditional import would
> > need to happen in every function within my custom module, correct?
>
> > But it would be nicer to avoid duplicating that import -- if it's
> > possible to do the conditional import at the top of a module. It seems
> > to me that a conditional import statement at the top of a custom
> > module cannot successfully reference the request object -- because it
> > is not contained in a function, so I don't know how to pass the
> > request object to the module - is that possible? Or is there another
> > way to determine if it's running on GAE?
>
> > Dan
>
> > On Jul 12, 8:42 am, mdipierro <[email protected]> wrote:
>
> > > You can one one import statement at the top of the module.
>
> > > As far as global objects, it depends. I suggest defining a class, pass
> > > the globals to the contructor, store them, so that all methods have
> > > access to them as needed.
>
> > > On Jul 12, 9:42 am, Dan <[email protected]> wrote:
>
> > > > ok, that makes sense. And would I need to put import statements
> > > > inside each function in my custom module? Or can I do something to get
> > > > that module-level reference to request/response/session/etc working?
>
> > > > On Jul 11, 10:21 pm, mdipierro <[email protected]> wrote:
>
> > > > > This is not a bad idea but there some rules to follow.
>
> > > > > request, response, session, cache, T are global objects in web2py so
> > > > > if you import a function from a module, you have to pass those 5
> > > > > objects to the function (not all of them, only those you need). You
> > > > > probably want to pass your database connection too.
>
> > > > > All the other web2py keywords can be imported from your modules as
> > > > > needed.
>
> > > > > Massimo
>
> > > > > On Jul 11, 5:48 pm, Dan <[email protected]> wrote:
>
> > > > > > Hello-
> > > > > > I want to re-use some data access routines in a few different
> > > > > > controller files, so I would like to put them in a separate file in
> > > > > > the /modules directory, and then import that file into the
> > > > > > controller
> > > > > > files that need them. However, I'm running into this error because
> > > > > > I'm
> > > > > > trying to use some web2py stuff in my module, like caching - and
> > > > > > this
> > > > > > is a conditional import that depends on accessing the request
> > > > > > variable.
>
> > > > > > in /modules/my_module.py:
> > > > > > if request.env.web2py_runtime_gae: # if running on Google App Engine
> > > > > > from gluon.contrib.gae_memcache import MemcacheClient
> > > > > > cache.ram=cache.disk=MemcacheClient(request)
>
> > > > > > error:
> > > > > > name 'request' is not defined
>
> > > > > > Another way to put it is that I'm building an abstraction layer on
> > > > > > top
> > > > > > of web2py's DAL so that I can reuse my code. Is this possible? Or
> > > > > > maybe a bad idea?
>
> > > > > > Dan
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