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utils.py
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# -*- coding: utf-8 -*-
# Copyright (C) 2015-2018 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/
import os
import logging
import functools
from dogpile.cache import CacheRegion
from dogpile.cache.util import compat
from rhodecode.lib.utils import safe_str, sha1
from . import region_meta
log = logging.getLogger(__name__)
class RhodeCodeCacheRegion(CacheRegion):
def conditional_cache_on_arguments(
self, namespace=None,
expiration_time=None,
should_cache_fn=None,
to_str=compat.string_type,
function_key_generator=None,
condition=True):
"""
Custom conditional decorator, that will not touch any dogpile internals if
condition isn't meet. This works a bit different than should_cache_fn
And it's faster in cases we don't ever want to compute cached values
"""
expiration_time_is_callable = compat.callable(expiration_time)
if function_key_generator is None:
function_key_generator = self.function_key_generator
def decorator(fn):
if to_str is compat.string_type:
# backwards compatible
key_generator = function_key_generator(namespace, fn)
else:
key_generator = function_key_generator(namespace, fn, to_str=to_str)
@functools.wraps(fn)
def decorate(*arg, **kw):
key = key_generator(*arg, **kw)
@functools.wraps(fn)
def creator():
return fn(*arg, **kw)
if not condition:
return creator()
timeout = expiration_time() if expiration_time_is_callable \
else expiration_time
return self.get_or_create(key, creator, timeout, should_cache_fn)
def invalidate(*arg, **kw):
key = key_generator(*arg, **kw)
self.delete(key)
def set_(value, *arg, **kw):
key = key_generator(*arg, **kw)
self.set(key, value)
def get(*arg, **kw):
key = key_generator(*arg, **kw)
return self.get(key)
def refresh(*arg, **kw):
key = key_generator(*arg, **kw)
value = fn(*arg, **kw)
self.set(key, value)
return value
decorate.set = set_
decorate.invalidate = invalidate
decorate.refresh = refresh
decorate.get = get
decorate.original = fn
decorate.key_generator = key_generator
return decorate
return decorator
def make_region(*arg, **kw):
return RhodeCodeCacheRegion(*arg, **kw)
def get_default_cache_settings(settings, prefixes=None):
prefixes = prefixes or []
cache_settings = {}
for key in settings.keys():
for prefix in prefixes:
if key.startswith(prefix):
name = key.split(prefix)[1].strip()
val = settings[key]
if isinstance(val, basestring):
val = val.strip()
cache_settings[name] = val
return cache_settings
def compute_key_from_params(*args):
"""
Helper to compute key from given params to be used in cache manager
"""
return sha1("_".join(map(safe_str, args)))
def key_generator(namespace, fn):
fname = fn.__name__
def generate_key(*args):
namespace_pref = namespace or 'default'
arg_key = compute_key_from_params(*args)
final_key = "{}:{}_{}".format(namespace_pref, fname, arg_key)
return final_key
return generate_key
def get_or_create_region(region_name, region_namespace=None):
from rhodecode.lib.rc_cache.backends import FileNamespaceBackend
region_obj = region_meta.dogpile_cache_regions.get(region_name)
if not region_obj:
raise EnvironmentError(
'Region `{}` not in configured: {}.'.format(
region_name, region_meta.dogpile_cache_regions.keys()))
region_uid_name = '{}:{}'.format(region_name, region_namespace)
if isinstance(region_obj.actual_backend, FileNamespaceBackend):
region_exist = region_meta.dogpile_cache_regions.get(region_namespace)
if region_exist:
log.debug('Using already configured region: %s', region_namespace)
return region_exist
cache_dir = region_meta.dogpile_config_defaults['cache_dir']
expiration_time = region_obj.expiration_time
if not os.path.isdir(cache_dir):
os.makedirs(cache_dir)
new_region = make_region(
name=region_uid_name, function_key_generator=key_generator
)
namespace_filename = os.path.join(
cache_dir, "{}.cache.dbm".format(region_namespace))
# special type that allows 1db per namespace
new_region.configure(
backend='dogpile.cache.rc.file_namespace',
expiration_time=expiration_time,
arguments={"filename": namespace_filename}
)
# create and save in region caches
log.debug('configuring new region: %s',region_uid_name)
region_obj = region_meta.dogpile_cache_regions[region_namespace] = new_region
return region_obj
def clear_cache_namespace(cache_region, cache_namespace_uid):
region = get_or_create_region(cache_region, cache_namespace_uid)
cache_keys = region.backend.list_keys(prefix=cache_namespace_uid)
region.delete_multi(cache_keys)
return len(cache_keys)