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# -*- coding: utf-8 -*-
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# Copyright (C) 2015-2018 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 Affero General Public License, version 3
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# (only), as published by the Free Software Foundation.
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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 Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# This program is dual-licensed. If you wish to learn more about the
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# RhodeCode Enterprise Edition, including its added features, Support services,
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# and proprietary license terms, please see https://rhodecode.com/licenses/
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import os
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import logging
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import functools
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import threading
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from dogpile.cache import CacheRegion
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from dogpile.cache.util import compat
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import rhodecode
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from rhodecode.lib.utils import safe_str, sha1
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from rhodecode.lib.utils2 import safe_unicode
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from rhodecode.model.db import Session, CacheKey, IntegrityError
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from . import region_meta
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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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def get_or_create_region(region_name, region_namespace=None):
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from rhodecode.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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raise EnvironmentError(
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'Region `{}` not in configured: {}.'.format(
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region_name, region_meta.dogpile_cache_regions.keys()))
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region_uid_name = '{}:{}'.format(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, function_key_generator=key_generator
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)
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namespace_filename = os.path.join(
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cache_dir, "{}.cache.dbm".format(region_namespace))
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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):
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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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region.delete_multi(cache_keys)
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return len(cache_keys)
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class ActiveRegionCache(object):
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def __init__(self, context):
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self.context = context
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def should_invalidate(self):
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return False
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class FreshRegionCache(object):
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def __init__(self, context):
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self.context = context
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def should_invalidate(self):
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return True
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class InvalidationContext(object):
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"""
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usage::
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import time
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from rhodecode.lib import rc_cache
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my_id = 1
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cache_namespace_uid = 'cache_demo.{}'.format(my_id)
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invalidation_namespace = 'repo_cache:1'
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region = rc_cache.get_or_create_region('cache_perms', cache_namespace_uid)
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@region.conditional_cache_on_arguments(namespace=cache_namespace_uid,
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expiration_time=30,
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condition=True)
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def heavy_compute(cache_name, param1, param2):
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print('COMPUTE {}, {}, {}'.format(cache_name, param1, param2))
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import time
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time.sleep(30)
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return True
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start = time.time()
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inv_context_manager = rc_cache.InvalidationContext(
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uid=cache_namespace_uid, invalidation_namespace=invalidation_namespace)
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with inv_context_manager as invalidation_context:
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# check for stored invalidation signal, and maybe purge the cache
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# before computing it again
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if invalidation_context.should_invalidate():
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heavy_compute.invalidate('some_name', 'param1', 'param2')
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result = heavy_compute('some_name', 'param1', 'param2')
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compute_time = time.time() - start
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print(compute_time)
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# To send global invalidation signal, simply run
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CacheKey.set_invalidate(invalidation_namespace)
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"""
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def __repr__(self):
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return '<InvalidationContext:{}[{}]>'.format(
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safe_str(self.cache_key), safe_str(self.uid))
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def __init__(self, uid, invalidation_namespace='',
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raise_exception=False, thread_scoped=True):
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self.uid = uid
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self.invalidation_namespace = invalidation_namespace
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self.raise_exception = raise_exception
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self.proc_id = safe_unicode(rhodecode.CONFIG.get('instance_id') or 'DEFAULT')
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self.thread_id = 'global'
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# Append the thread id to the cache key if this invalidation context
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# should be scoped to the current thread.
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if thread_scoped:
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self.thread_id = threading.current_thread().ident
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self.cache_key = compute_key_from_params(uid)
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self.cache_key = 'proc:{}_thread:{}_{}'.format(
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self.proc_id, self.thread_id, self.cache_key)
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def get_or_create_cache_obj(self, uid, invalidation_namespace=''):
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log.debug('Checking if %s cache key is present and active', self.cache_key)
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cache_obj = CacheKey.get_active_cache(self.cache_key)
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invalidation_namespace = invalidation_namespace or self.invalidation_namespace
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if not cache_obj:
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cache_obj = CacheKey(self.cache_key, cache_args=invalidation_namespace)
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return cache_obj
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def __enter__(self):
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"""
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Test if current object is valid, and return CacheRegion function
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that does invalidation and calculation
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"""
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# register or get a new key based on uid
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self.cache_obj = self.get_or_create_cache_obj(uid=self.uid)
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if self.cache_obj.cache_active:
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# means our cache obj is existing and marked as it's
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# cache is not outdated, we return ActiveRegionCache
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self.skip_cache_active_change = True
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return ActiveRegionCache(context=self)
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# the key is either not existing or set to False, we return
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# the real invalidator which re-computes value. We additionally set
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# the flag to actually update the Database objects
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self.skip_cache_active_change = False
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return FreshRegionCache(context=self)
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def __exit__(self, exc_type, exc_val, exc_tb):
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if self.skip_cache_active_change:
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return
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try:
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self.cache_obj.cache_active = True
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Session().add(self.cache_obj)
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Session().commit()
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except IntegrityError:
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# if we catch integrity error, it means we inserted this object
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# assumption is that's really an edge race-condition case and
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# it's safe is to skip it
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Session().rollback()
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except Exception:
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log.exception('Failed to commit on cache key update')
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Session().rollback()
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if self.raise_exception:
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raise
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