You do not ever pass the arguments to "get_data_callback." You need to do
something more like:
class MC():
@staticmethod
def get( key, get_data_callback, **kwargs):
data_set = memcache.get( key )
if data_set == None:
data_set = get_data_callback(**kwargs)
memcache.set( key, data_set )
return data_set
and:
def get_user( id ):
return MC.get( key, lambda id: DB.get_user( id ),id=id )
Good luck.
Robert
On Mon, Sep 7, 2009 at 4:25 PM, (jpgerek) <[email protected]> wrote:
>
> Hi, I'm new with python and I having problems to implement the typical
> memcache pattern.
>
> I wan't to make a decorator of the most common memcache pattern so I
> don't have to implement the logic everytime. My intention is having a
> function that receives the key to get and a callback with the
> datastore gets, in case the memcache key expires, it's evicted or
> whatever.
>
> This is what I have now:
>
> class MC():
> @staticmethod
> def get( key, get_data_callback ):
> data_set = memcache.get( key )
> if data_set == None:
> data_set = get_data_callback()
> memcache.set( key, data_set )
> return data_set
>
> I'm having problems with the callback when some params are required.
> For instance:
>
> class DB():
> @staticmethod
> def get_user( id ):
> return User().all().filter('id =', id').fetch(1)
>
> def get_user( id ):
> return MC.get( key, lambda id: DB.get_user( id ) )
>
> The error I get when I call 'get_user(1)' is something like:
>
> TypeError: <lambda>() takes exactly 1 argument (0 given)
>
> Though it works in this case:
>
> def get_user_one():
> return User().all().filter('id = 1').fetch(1)
>
> It seems to be something with the params, they are lost, could it be
> solved with closures? other approach?
>
> >
>
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