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# RhodeCode VCSServer provides access to different vcs backends via network.
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# Copyright (C) 2014-2018 RhodeCode GmbH
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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import os
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import logging
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import functools
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from vcsserver.utils import safe_str, sha1
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from dogpile.cache import CacheRegion
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from dogpile.cache.util import compat
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log = logging.getLogger(__name__)
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class RhodeCodeCacheRegion(CacheRegion):
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def conditional_cache_on_arguments(
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self, namespace=None,
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expiration_time=None,
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should_cache_fn=None,
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to_str=compat.string_type,
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function_key_generator=None,
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condition=True):
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"""
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Custom conditional decorator, that will not touch any dogpile internals if
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condition isn't meet. This works a bit different than should_cache_fn
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And it's faster in cases we don't ever want to compute cached values
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"""
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expiration_time_is_callable = compat.callable(expiration_time)
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if function_key_generator is None:
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function_key_generator = self.function_key_generator
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def decorator(fn):
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if to_str is compat.string_type:
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# backwards compatible
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key_generator = function_key_generator(namespace, fn)
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else:
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key_generator = function_key_generator(namespace, fn, to_str=to_str)
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@functools.wraps(fn)
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def decorate(*arg, **kw):
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key = key_generator(*arg, **kw)
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@functools.wraps(fn)
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def creator():
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return fn(*arg, **kw)
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if not condition:
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return creator()
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timeout = expiration_time() if expiration_time_is_callable \
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else expiration_time
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return self.get_or_create(key, creator, timeout, should_cache_fn)
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def invalidate(*arg, **kw):
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key = key_generator(*arg, **kw)
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self.delete(key)
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def set_(value, *arg, **kw):
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key = key_generator(*arg, **kw)
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self.set(key, value)
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def get(*arg, **kw):
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key = key_generator(*arg, **kw)
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return self.get(key)
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def refresh(*arg, **kw):
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key = key_generator(*arg, **kw)
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value = fn(*arg, **kw)
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self.set(key, value)
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return value
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decorate.set = set_
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decorate.invalidate = invalidate
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decorate.refresh = refresh
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decorate.get = get
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decorate.original = fn
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decorate.key_generator = key_generator
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return decorate
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return decorator
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def make_region(*arg, **kw):
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return RhodeCodeCacheRegion(*arg, **kw)
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def get_default_cache_settings(settings, prefixes=None):
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prefixes = prefixes or []
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cache_settings = {}
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for key in settings.keys():
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for prefix in prefixes:
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if key.startswith(prefix):
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name = key.split(prefix)[1].strip()
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val = settings[key]
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if isinstance(val, basestring):
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val = val.strip()
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cache_settings[name] = val
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return cache_settings
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def compute_key_from_params(*args):
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"""
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Helper to compute key from given params to be used in cache manager
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"""
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return sha1("_".join(map(safe_str, args)))
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def key_generator(namespace, fn):
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fname = fn.__name__
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def generate_key(*args):
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namespace_pref = namespace or 'default'
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arg_key = compute_key_from_params(*args)
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final_key = "{}:{}_{}".format(namespace_pref, fname, arg_key)
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return final_key
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return generate_key
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