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"""
Mako Integration
----------------
dogpile.cache includes a `Mako <http://www.makotemplates.org>`_ plugin
that replaces `Beaker <http://beaker.groovie.org>`_
as the cache backend.
Setup a Mako template lookup using the "dogpile.cache" cache implementation
and a region dictionary::
from dogpile.cache import make_region
from mako.lookup import TemplateLookup
my_regions = {
"local":make_region().configure(
"dogpile.cache.dbm",
expiration_time=360,
arguments={"filename":"file.dbm"}
),
"memcached":make_region().configure(
"dogpile.cache.pylibmc",
expiration_time=3600,
arguments={"url":["127.0.0.1"]}
)
}
mako_lookup = TemplateLookup(
directories=["/myapp/templates"],
cache_impl="dogpile.cache",
cache_args={
'regions':my_regions
}
)
To use the above configuration in a template, use the ``cached=True``
argument on any Mako tag which accepts it, in conjunction with the
name of the desired region as the ``cache_region`` argument::
<%def name="mysection()" cached="True" cache_region="memcached">
some content that's cached
</%def>
"""
from mako.cache import CacheImpl
class MakoPlugin(CacheImpl):
"""A Mako ``CacheImpl`` which talks to dogpile.cache."""
def __init__(self, cache):
super(MakoPlugin, self).__init__(cache)
try:
self.regions = self.cache.template.cache_args["regions"]
except KeyError:
raise KeyError(
"'cache_regions' argument is required on the "
"Mako Lookup or Template object for usage "
"with the dogpile.cache plugin."
)
def _get_region(self, **kw):
try:
region = kw["region"]
except KeyError:
raise KeyError(
"'cache_region' argument must be specified with 'cache=True'"
"within templates for usage with the dogpile.cache plugin."
)
try:
return self.regions[region]
except KeyError:
raise KeyError("No such region '%s'" % region)
def get_and_replace(self, key, creation_function, **kw):
expiration_time = kw.pop("timeout", None)
return self._get_region(**kw).get_or_create(
key, creation_function, expiration_time=expiration_time
)
def get_or_create(self, key, creation_function, **kw):
return self.get_and_replace(key, creation_function, **kw)
def put(self, key, value, **kw):
self._get_region(**kw).put(key, value)
def get(self, key, **kw):
expiration_time = kw.pop("timeout", None)
return self._get_region(**kw).get(key, expiration_time=expiration_time)
def invalidate(self, key, **kw):
self._get_region(**kw).delete(key)
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