Thanks Mike, this is helping a great deal. Seeing as caches like Memcached, Redis, are systems that by design can lose data, in preference for speed, using this for CC details is to me a very strange design decision, and I sure wish I knew about that via the documentation.
I don't mind using a DB cache (I am currently still using DB cache for SORL on this site too), so I will set up a db cache anyway. The site is on the production machine, but is not exposed to real trafic yet, so I am still actually using locmem for cache. And again - the thing with the old style and new style cache declarations - is that in the docs? I'd love to know that I just missed it somehow... I am using latest django and Satchmo tip - do you know if this still applies? *Paul Walsh* 0543551144 On Thu, Nov 8, 2012 at 4:57 PM, Mike Hostetler <[email protected]>wrote: > I found the cache requirement in the code -- I was debugging why we were > getting an occasional stopped transaction (transactions were saved as > LINKED) and discovered that it how it worked. This was a problem with > Memcache -- Memcache was working but once in a while I would have a cache > miss on the credit card number, which is a bad thing. When I switched to > the database cache, the problem with the LINKED transactions all but went > away (now it happens when a user reloads a page when Satchmo is waiting for > response to their external service request, al a AuthorizeNet or UPS). > > Cache invalidation is always a tricky subject -- I kinda had the same > problem. Did you try anything else but Memcache? I didn't look at any other > caching except Database and Memcache (since they are well-documented and > come standard with Django). I'm certain that someone has developed plugins > for others. > > For Satchmo: you do have to setup the cache twice: once for Django using > the 'CACHES' dictionary and another time with the 'old' way with > CACHE_BACKEND,CACHE_MIDDLEWARE_SECONDS. and CACHE_MIDDLEWARE_KEY_PREFIX. > That last one is how Satchmo uses the cache for cc numbers, etc. > > > On Thu, Nov 8, 2012 at 8:40 AM, Paul Walsh <[email protected]> wrote: > >> Thanks Mike, >> >> Where did you find this information about the credit card info + cache? >> For the life of me, I can't find anything in the docs about this. >> >> I am not feeling the love for the Satchmo docs for a bunch of reasons >> right now.... but anyway, I digress. >> >> It is not that I don't want to use caching in production. I have a >> problem where the cache doesn't seem to be invalidating in some cases, and >> I am therefore diving in to Satchmo's caching and just trying to understand >> what is going on (particularly, how it is different from Django's built in >> caching, or not). >> >> So, my first step was to work out how to turn caching off... >> >> Also, is it possible to use Johnny Cache with Satchmo? Or, a Redis cache? >> >> I am also wondering, concerned, why could you get a memached backend >> working with Satchmo? This is fairly trivial to setup with Django projects >> usually. >> >> thanks. >> >> *Paul Walsh* >> 0543551144 >> >> >> >> On Thu, Nov 8, 2012 at 4:15 PM, Mike Hostetler <[email protected] >> > wrote: >> >>> I'm surprised no one answered this. I'll take a shot . . >>> >>> You can't. Or you can, but then you can't sent credit card info to the >>> payment processor. One of the decisions made in Satchmo was to use the >>> cache to persist the credit card number from one screen to the next. I'm >>> not going to express my opinion on that decision . . . >>> >>> But why don't you want to use caching in production? That really doesn't >>> make a lot of sense -- a properly configured caching system is worth the >>> time in any Django app. I did have some problems with Memcache so I >>> switched it to a database cache and that has helped a lot (YMMV with >>> Memcache -- I actually would rather use that than the database cache). >>> >>> >>> >>> On Nov 7, 2012 10:14 AM, "Paul Walsh" <[email protected]> wrote: >>> >>>> I want to disable caching in Satchmo, in production. >>>> >>>> I can't find anything in the docs that explicitly declares how I can >>>> managing Satchmo's caching. >>>> >>>> I'd love a pointer to the right place in the docs, if there is one, and >>>> also if anyone know hows I can disable caching. >>>> >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Satchmo users" group. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msg/satchmo-users/-/S2MNqFXmnPkJ. >>>> To post to this group, send email to [email protected]. >>>> To unsubscribe from this group, send email to >>>> [email protected]. >>>> For more options, visit this group at >>>> http://groups.google.com/group/satchmo-users?hl=en. >>>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Satchmo users" group. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]. >>> For more options, visit this group at >>> http://groups.google.com/group/satchmo-users?hl=en. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Satchmo users" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/satchmo-users?hl=en. >> > > > > -- > Mike Hostetler > SquarePeg Systems > http://www.squarepegsystems.com > > -- > You received this message because you are subscribed to the Google Groups > "Satchmo users" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/satchmo-users?hl=en. > -- You received this message because you are subscribed to the Google Groups "Satchmo users" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/satchmo-users?hl=en.
