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# -*- coding: utf-8 -*-
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# Copyright (C) 2015-2016 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 beaker
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import logging
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import threading
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from beaker.cache import _cache_decorate, cache_regions, region_invalidate
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from sqlalchemy.exc import IntegrityError
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from rhodecode.lib.utils import safe_str, md5
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from rhodecode.model.db import Session, CacheKey
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log = logging.getLogger(__name__)
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FILE_TREE = 'cache_file_tree'
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FILE_TREE_META = 'cache_file_tree_metadata'
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FILE_SEARCH_TREE_META = 'cache_file_search_metadata'
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SUMMARY_STATS = 'cache_summary_stats'
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# This list of caches gets purged when invalidation happens
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USED_REPO_CACHES = (FILE_TREE, FILE_SEARCH_TREE_META)
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DEFAULT_CACHE_MANAGER_CONFIG = {
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'type': 'memorylru_base',
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'max_items': 10240,
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'key_length': 256,
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'enabled': True
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}
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def configure_cache_region(
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region_name, region_kw, default_cache_kw, default_expire=60):
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default_type = default_cache_kw.get('type', 'memory')
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default_lock_dir = default_cache_kw.get('lock_dir')
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default_data_dir = default_cache_kw.get('data_dir')
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region_kw['lock_dir'] = region_kw.get('lock_dir', default_lock_dir)
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region_kw['data_dir'] = region_kw.get('data_dir', default_data_dir)
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region_kw['type'] = region_kw.get('type', default_type)
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region_kw['expire'] = int(region_kw.get('expire', default_expire))
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beaker.cache.cache_regions[region_name] = region_kw
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def get_cache_manager(region_name, cache_name, custom_ttl=None):
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"""
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Creates a Beaker cache manager. Such instance can be used like that::
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_namespace = caches.get_repo_namespace_key(caches.XXX, repo_name)
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cache_manager = caches.get_cache_manager('repo_cache_long', _namespace)
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_cache_key = caches.compute_key_from_params(repo_name, commit.raw_id)
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def heavy_compute():
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...
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result = cache_manager.get(_cache_key, createfunc=heavy_compute)
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:param region_name: region from ini file
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:param cache_name: custom cache name, usually prefix+repo_name. eg
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file_switcher_repo1
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:param custom_ttl: override .ini file timeout on this cache
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:return: instance of cache manager
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"""
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cache_config = cache_regions.get(region_name, DEFAULT_CACHE_MANAGER_CONFIG)
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if custom_ttl:
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log.debug('Updating region %s with custom ttl: %s',
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region_name, custom_ttl)
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cache_config.update({'expire': custom_ttl})
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return beaker.cache.Cache._get_cache(cache_name, cache_config)
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def clear_cache_manager(cache_manager):
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"""
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namespace = 'foobar'
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cache_manager = get_cache_manager('repo_cache_long', namespace)
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clear_cache_manager(cache_manager)
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"""
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log.debug('Clearing all values for cache manager %s', cache_manager)
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cache_manager.clear()
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def clear_repo_caches(repo_name):
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# invalidate cache manager for this repo
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for prefix in USED_REPO_CACHES:
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namespace = get_repo_namespace_key(prefix, repo_name)
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cache_manager = get_cache_manager('repo_cache_long', namespace)
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clear_cache_manager(cache_manager)
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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 md5("_".join(map(safe_str, args)))
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def get_repo_namespace_key(prefix, repo_name):
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return '{0}_{1}'.format(prefix, compute_key_from_params(repo_name))
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def conditional_cache(region, prefix, condition, func):
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"""
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Conditional caching function use like::
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def _c(arg):
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# heavy computation function
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return data
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# depending on the condition the compute is wrapped in cache or not
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compute = conditional_cache('short_term', 'cache_desc',
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condition=True, func=func)
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return compute(arg)
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:param region: name of cache region
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:param prefix: cache region prefix
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:param condition: condition for cache to be triggered, and
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return data cached
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:param func: wrapped heavy function to compute
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"""
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wrapped = func
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if condition:
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log.debug('conditional_cache: True, wrapping call of '
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'func: %s into %s region cache', region, func)
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cached_region = _cache_decorate((prefix,), None, None, region)
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wrapped = cached_region(func)
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return wrapped
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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 invalidate(self, *args, **kwargs):
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return False
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def compute(self):
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log.debug('Context cache: getting obj %s from cache', self.context)
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return self.context.compute_func(self.context.cache_key)
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class FreshRegionCache(ActiveRegionCache):
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def invalidate(self):
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log.debug('Context cache: invalidating cache for %s', self.context)
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region_invalidate(
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self.context.compute_func, None, self.context.cache_key)
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return True
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class InvalidationContext(object):
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def __repr__(self):
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return '<InvalidationContext:{}[{}]>'.format(
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safe_str(self.repo_name), safe_str(self.cache_type))
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def __init__(self, compute_func, repo_name, cache_type,
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raise_exception=False, thread_scoped=False):
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self.compute_func = compute_func
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self.repo_name = repo_name
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self.cache_type = cache_type
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self.cache_key = compute_key_from_params(
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repo_name, cache_type)
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self.raise_exception = raise_exception
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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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thread_id = threading.current_thread().ident
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self.cache_key = '{cache_key}_{thread_id}'.format(
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cache_key=self.cache_key, thread_id=thread_id)
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def get_cache_obj(self):
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cache_key = CacheKey.get_cache_key(
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self.repo_name, self.cache_type)
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cache_obj = CacheKey.get_active_cache(cache_key)
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if not cache_obj:
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cache_obj = CacheKey(cache_key, self.repo_name)
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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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self.cache_obj = self.get_cache_obj()
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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 BaseInvalidator
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self.skip_cache_active_change = True
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return ActiveRegionCache(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(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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