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# RhodeCode VCSServer provides access to different vcs backends via network.
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# Copyright (C) 2014-2020 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 functools
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import logging
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import os
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import time
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import decorator
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from dogpile.cache import CacheRegion
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from vcsserver.lib.rc_cache import region_meta
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from vcsserver.str_utils import safe_bytes
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from vcsserver.utils import sha1
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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=str,
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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 from 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 = 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 get_or_create_for_user_func(key_generator, user_func, *arg, **kw):
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if not condition:
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log.debug('Calling un-cached method:%s', user_func.__name__)
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start = time.time()
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result = user_func(*arg, **kw)
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total = time.time() - start
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log.debug('un-cached method:%s took %.4fs', user_func.__name__, total)
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return result
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key = key_generator(*arg, **kw)
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timeout = expiration_time() if expiration_time_is_callable \
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else expiration_time
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log.debug('Calling cached method:`%s`', user_func.__name__)
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return self.get_or_create(key, user_func, timeout, should_cache_fn, (arg, kw))
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def cache_decorator(user_func):
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if to_str is str:
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# backwards compatible
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key_generator = function_key_generator(namespace, user_func)
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else:
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key_generator = function_key_generator(namespace, user_func, to_str=to_str)
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def refresh(*arg, **kw):
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"""
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Like invalidate, but regenerates the value instead
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"""
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key = key_generator(*arg, **kw)
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value = user_func(*arg, **kw)
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self.set(key, value)
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return value
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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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user_func.set = set_
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user_func.invalidate = invalidate
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user_func.get = get
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user_func.refresh = refresh
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user_func.key_generator = key_generator
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user_func.original = user_func
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# Use `decorate` to preserve the signature of :param:`user_func`.
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return decorator.decorate(user_func, functools.partial(
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get_or_create_for_user_func, key_generator))
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return cache_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, str):
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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(safe_bytes("_".join(map(str, args))))
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def backend_key_generator(backend):
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"""
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Special wrapper that also sends over the backend to the key generator
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"""
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def wrapper(namespace, fn):
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return key_generator(backend, namespace, fn)
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return wrapper
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def key_generator(backend, namespace, fn):
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fname = fn.__name__
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def generate_key(*args):
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backend_prefix = getattr(backend, 'key_prefix', None) or 'backend_prefix'
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namespace_pref = namespace or 'default_namespace'
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arg_key = compute_key_from_params(*args)
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final_key = f"{backend_prefix}:{namespace_pref}:{fname}_{arg_key}"
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return final_key
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return generate_key
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def get_or_create_region(region_name, region_namespace=None):
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from vcsserver.lib.rc_cache.backends import FileNamespaceBackend
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region_obj = region_meta.dogpile_cache_regions.get(region_name)
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if not region_obj:
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reg_keys = list(region_meta.dogpile_cache_regions.keys())
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raise EnvironmentError(f'Region `{region_name}` not in configured: {reg_keys}.')
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region_uid_name = f'{region_name}:{region_namespace}'
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if isinstance(region_obj.actual_backend, FileNamespaceBackend):
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region_exist = region_meta.dogpile_cache_regions.get(region_namespace)
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if region_exist:
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log.debug('Using already configured region: %s', region_namespace)
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return region_exist
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cache_dir = region_meta.dogpile_config_defaults['cache_dir']
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expiration_time = region_obj.expiration_time
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if not os.path.isdir(cache_dir):
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os.makedirs(cache_dir)
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new_region = make_region(
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name=region_uid_name,
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function_key_generator=backend_key_generator(region_obj.actual_backend)
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)
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namespace_filename = os.path.join(
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cache_dir, f"{region_namespace}.cache.dbm")
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# special type that allows 1db per namespace
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new_region.configure(
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backend='dogpile.cache.rc.file_namespace',
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expiration_time=expiration_time,
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arguments={"filename": namespace_filename}
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)
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# create and save in region caches
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log.debug('configuring new region: %s', region_uid_name)
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region_obj = region_meta.dogpile_cache_regions[region_namespace] = new_region
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return region_obj
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def clear_cache_namespace(cache_region, cache_namespace_uid, invalidate=False):
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region = get_or_create_region(cache_region, cache_namespace_uid)
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cache_keys = region.backend.list_keys(prefix=cache_namespace_uid)
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num_delete_keys = len(cache_keys)
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if invalidate:
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region.invalidate(hard=False)
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else:
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if num_delete_keys:
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region.delete_multi(cache_keys)
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return num_delete_keys
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