removing items from cache not working

[Alex]

I've got a function which returns a dict with some values. the function has this decorator:

@cache('admin.setting.limits', 3600, cache.ram)

def get_limits():

..

This works fine and the values are used from cache. When I change those settings I want to clear the cache so I'm doing this:

cache.ram.clear(regex='admin\.setting.*')

When I call my function again the cached values are still used. Am I doing something wrong here? Any ideas?

regards,

Alex

[Derek]

Why are you not just clearing the exact key?

cache.ram('admin.setting.limits',None)

[Alex]

because I have multiple values cached in different functions and all can be edited on the same page. I'll test to delete it with the exact key. Anything wrong with the regex?

[Alex]

tested with clearing values with exact key and this seems to work. Do you know why using the regex doesn't work?

Alex

[Derek]

Your regex is wrong then.

try this?

admin\.setting\.[A-z]*

[Alex]

the regex should be fine (I tested it with a regex online tool). Doesn't make a difference if I use your regex.

Thanks for your help, I can fix the problem by clearing the exact values. But I'd still like to understand what's wrong with clearing the cache by regex.

[Anthony]

How about:

cache.ram.clear(regex=r'admin\.setting.*')

Anthony

[Alex]

That would make sense. But it's still the same result. I've changed my cache keys to avoid dots and only use underscore instead:

adminsetting_limits

and now I can delete the cached values without any problems:

cache.ram.clear(regex=r'adminsetting.*')

I still don't fully understand why the original regex doesn't work but at least it's not an issue anymore.

[Alex]

seems like this is related to a change in web2py. Until recently I used web2py 2.4.6 and I never had a problem - I just tested it again. In 2.4.6 the original regex works. After I upgraded to 2.9.11 the regex doesn't work anymore.

[Paolo Valleri]

Hi Alex, I think this is the commit you are looking for https://github.com/web2py/web2py/commit/0dbdf8c676547071d608f800f72d7c3d0aa6ebda

Only the first element matching the regex is deleted.

I'd revert that commit, and it'd be nice to add a test to better check that issue

Paolo

[Alex]

 exactly, that's the issue. Now it makes sense why it worked on very rare occasions. A test for this use case would be a good idea. here is the code in 2.4.6 which runs fine:

        r = re.compile(regex)
        for (key, value) in storage.items():
            if r.match(str(key)):
                del storage[key]

and this is the code from 2.9.11 which fails:

        r = re.compile(regex)
        for key in storage:
            if r.match(str(key)):
                del storage[key]
                break

should I open a bug report or can someone directly fix it?

btw, changing the cache keys to avoid dots (as mentioned above) therefor only worked because I only had one cached value for testing.

Alex

[Paolo Valleri]

I will fix it later today

On Dec 16, 2014 1:43 PM, "Alex" <mrau...@gmail.com> wrote:

 exactly, that's the issue. Now it makes sense why it worked on very rare occasions. A test for this use case would be a good idea. here is the code in 2.4.6 which runs fine:

        r = re.compile(regex)
        for (key, value) in storage.items():
            if r.match(str(key)):
                del storage[key]

and this is the code from 2.9.11 which fails:

        r = re.compile(regex)
        for key in storage:
            if r.match(str(key)):
                del storage[key]
                break

should I open a bug report or can someone directly fix it?

Alex

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