Cache + Bottlenose API - need help

[Kiran Subbaraman]

I was trying to use Bottlenose's API (thin wrapper on the Amazon Products API), alongwith web2py's Cache.
bottlenose: https://github.com/lionheart/bottlenose

Bottlenose provides callbacks where the caching logic can be introduced.
The code is listed below

cache_disk = CacheOnDisk(folder='path...')
cache_ram = CacheInRam()

def write_query_to_db(cache_url, data):
    return cache_ram(cache_url, lambda: cache_disk(cache_url, lambda: data, 3600), 60)

# Return None if the key is not present
def read_query_from_db(cache_url):
    # How do I read from the cache, the following doesn't seem to work
    return cache_ram(cache_url, lambda: cache_disk(cache_url))


amazon = bottlenose.Amazon(CacheWriter=write_query_to_db,
                           CacheReader=read_query_from_db, ...)

Any suggestions?
Thanks,
Kiran

[Leonel Câmara]

The thing is web2py caching logic is different from what bottlenose wants as it never really returns None, it also never really stores values directly it calls a function to get a value when it needs one so you need to make some kind of adapter for it, you were almost there.

I haven't tested it but this should work.

def reader(cache_url):
    return cache.ram(cache_url, lambda: None, time_expire=None)   # Time expire can be any value you want here (e.g 3600 so bottlenose writes it again in an hour)


def writer(cache_url, response_text):
    cache.ram(cache_url, lambda: response_text, time_expire=0)   # Time expire needs to be 0 here to make sure it always writes


amazon = bottlenose.Amazon(CacheWriter=writer,
                           CacheReader=reader, ....)

[Kiran Subbaraman]

I'll try this out in the next couple of days. Currently, have side-stepped the callback options from bottlenose, and using web2py cache the way it was designed to be used.
Thanks for your suggestions, Leonel.

________________________________________
Kiran Subbaraman
http://subbaraman.wordpress.com/about/

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