caches: allow force re-init of cache region for re-creating the cache

rhodecode/lib/rc_cache/utils.py

@@ -1,357 +1,357 b''
 # Copyright (C) 2015-2024 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 functools
 import logging
 import os
 import threading
 import time
 
 import decorator
 from dogpile.cache import CacheRegion
 
 import rhodecode
 from ...lib.hash_utils import sha1
 from ...lib.str_utils import safe_bytes
 from ...lib.type_utils import str2bool # noqa :required by imports from .utils
 
 from . import region_meta
 
 log = logging.getLogger(__name__)
 
 
 def isCython(func):
     """
     Private helper that checks if a function is a cython function.
     """
     return func.__class__.__name__ == 'cython_function_or_method'
 
 
 class RhodeCodeCacheRegion(CacheRegion):
 
     def __repr__(self):
         return f'`{self.__class__.__name__}(name={self.name}, backend={self.backend.__class__})`'
 
     def conditional_cache_on_arguments(
             self, namespace=None,
             expiration_time=None,
             should_cache_fn=None,
             to_str=str,
             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 from should_cache_fn
         And it's faster in cases we don't ever want to compute cached values
         """
         expiration_time_is_callable = callable(expiration_time)
         if not namespace:
             namespace = getattr(self, '_default_namespace', None)
 
         if function_key_generator is None:
             function_key_generator = self.function_key_generator
 
         def get_or_create_for_user_func(func_key_generator, user_func, *arg, **kw):
 
             if not condition:
                 log.debug('Calling un-cached method:%s', user_func.__name__)
                 start = time.time()
                 result = user_func(*arg, **kw)
                 total = time.time() - start
                 log.debug('un-cached method:%s took %.4fs', user_func.__name__, total)
                 return result
 
             key = func_key_generator(*arg, **kw)
 
             timeout = expiration_time() if expiration_time_is_callable \
                 else expiration_time
 
             log.debug('Calling cached method:`%s`', user_func.__name__)
             return self.get_or_create(key, user_func, timeout, should_cache_fn, (arg, kw))
 
         def cache_decorator(user_func):
             if to_str is str:
                 # backwards compatible
                 key_generator = function_key_generator(namespace, user_func)
             else:
                 key_generator = function_key_generator(namespace, user_func, to_str=to_str)
 
             def refresh(*arg, **kw):
                 """
                 Like invalidate, but regenerates the value instead
                 """
                 key = key_generator(*arg, **kw)
                 value = user_func(*arg, **kw)
                 self.set(key, value)
                 return value
 
             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)
 
             user_func.set = set_
             user_func.invalidate = invalidate
             user_func.get = get
             user_func.refresh = refresh
             user_func.key_generator = key_generator
             user_func.original = user_func
 
             # Use `decorate` to preserve the signature of :param:`user_func`.
             return decorator.decorate(user_func, functools.partial(
                 get_or_create_for_user_func, key_generator))
 
         return cache_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, str):
                     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(safe_bytes("_".join(map(str, args))))
 
 
 def custom_key_generator(backend, namespace, fn):
     func_name = fn.__name__
 
     def generate_key(*args):
         backend_pref = getattr(backend, 'key_prefix', None) or 'backend_prefix'
         namespace_pref = namespace or 'default_namespace'
         arg_key = compute_key_from_params(*args)
         final_key = f"{backend_pref}:{namespace_pref}:{func_name}_{arg_key}"
 
         return final_key
 
     return generate_key
 
 
 def backend_key_generator(backend):
     """
     Special wrapper that also sends over the backend to the key generator
     """
     def wrapper(namespace, fn):
         return custom_key_generator(backend, namespace, fn)
     return wrapper
 
 
-def get_or_create_region(region_name, region_namespace: str = None, use_async_runner=False):
+def get_or_create_region(region_name, region_namespace: str = None, use_async_runner=False, force=False):
     from .backends import FileNamespaceBackend
     from . import async_creation_runner
 
     region_obj = region_meta.dogpile_cache_regions.get(region_name)
     if not region_obj:
         reg_keys = list(region_meta.dogpile_cache_regions.keys())
         raise OSError(f'Region `{region_name}` not in configured: {reg_keys}.')
 
     region_uid_name = f'{region_name}:{region_namespace}'
 
     # Special case for ONLY the FileNamespaceBackend backend. We register one-file-per-region
     if isinstance(region_obj.actual_backend, FileNamespaceBackend):
         if not region_namespace:
             raise ValueError(f'{FileNamespaceBackend} used requires to specify region_namespace param')
 
         region_exist = region_meta.dogpile_cache_regions.get(region_namespace)
-        if region_exist:
+        if region_exist and not force:
             log.debug('Using already configured region: %s', region_namespace)
             return region_exist
 
         expiration_time = region_obj.expiration_time
 
         cache_dir = region_meta.dogpile_config_defaults['cache_dir']
         namespace_cache_dir = cache_dir
 
         # we default the namespace_cache_dir to our default cache dir.
         # however, if this backend is configured with filename= param, we prioritize that
         # so all caches within that particular region, even those namespaced end up in the same path
         if region_obj.actual_backend.filename:
             namespace_cache_dir = os.path.dirname(region_obj.actual_backend.filename)
 
         if not os.path.isdir(namespace_cache_dir):
             os.makedirs(namespace_cache_dir)
         new_region = make_region(
             name=region_uid_name,
             function_key_generator=backend_key_generator(region_obj.actual_backend)
         )
 
         namespace_filename = os.path.join(
             namespace_cache_dir, f"{region_name}_{region_namespace}.cache_db")
         # 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
 
     region_obj._default_namespace = region_namespace
     if use_async_runner:
         region_obj.async_creation_runner = async_creation_runner
     return region_obj
 
 
 def clear_cache_namespace(cache_region: str | RhodeCodeCacheRegion, cache_namespace_uid: str, method: str) -> int:
     from . import CLEAR_DELETE, CLEAR_INVALIDATE
 
     if not isinstance(cache_region, RhodeCodeCacheRegion):
         cache_region = get_or_create_region(cache_region, cache_namespace_uid)
     log.debug('clearing cache region: %s [prefix:%s] with method=%s',
               cache_region, cache_namespace_uid, method)
 
     num_affected_keys = 0
 
     if method == CLEAR_INVALIDATE:
         # NOTE: The CacheRegion.invalidate() method’s default mode of
         # operation is to set a timestamp local to this CacheRegion in this Python process only.
         # It does not impact other Python processes or regions as the timestamp is only stored locally in memory.
         cache_region.invalidate(hard=True)
 
     if method == CLEAR_DELETE:
         num_affected_keys = cache_region.backend.delete_multi_by_prefix(prefix=cache_namespace_uid)
     return num_affected_keys
 
 
 class ActiveRegionCache(object):
     def __init__(self, context, cache_data: dict):
         self.context = context
         self.cache_data = cache_data
 
     @property
     def state_uid(self) -> str:
         return self.cache_data['cache_state_uid']
 
 
 class InvalidationContext(object):
     """
     usage::
 
         from rhodecode.lib import rc_cache
 
         repo_namespace_key = 'some-cache-for-repo-id-100'
         inv_context_manager = rc_cache.InvalidationContext(key=repo_namespace_key)
 
         def cache_generator(_state_uid):
 
             @region.conditional_cache_on_arguments(namespace='some-common-namespace-100')
             def _dummy_func(*args):
                 # compute heavy function
                 return _state_uid, 'result'
 
             return _dummy_func
 
         with inv_context_manager as invalidation_context:
             cache_state_uid = invalidation_context.state_uid
             cache_func = cache_generator(cache_state_uid)
             previous_state_uid, result = cache_func(*call_args)
 
             should_invalidate = previous_state_uid != cache_state_uid
             if should_invalidate:
                 _, result = cache_func.refresh(*call_args)
 
         # To send global invalidation signal, simply run
         CacheKey.set_invalidate(repo_namespace_key)
 
     """
 
     def __repr__(self):
         return f'<InvalidationContext:{self.cache_key}>'
 
     def __init__(self, key, raise_exception=False, thread_scoped=None):
         self.cache_key = key
 
         self.raise_exception = raise_exception
         self.proc_id = rhodecode.ConfigGet().get_str('instance_id') or 'DEFAULT'
         self.thread_id = 'global'
 
         if thread_scoped is None:
             # if we set "default" we can override this via .ini settings
             thread_scoped = rhodecode.ConfigGet().get_bool('cache_thread_scoped')
 
         # Append the thread id to the cache key if this invalidation context
         # should be scoped to the current thread.
         if thread_scoped is True:
             self.thread_id = threading.current_thread().ident
 
         self.proc_key = f'proc:{self.proc_id}|thread:{self.thread_id}|key:{self.cache_key}'
         self.compute_time = 0
 
     def get_or_create_cache_obj(self):
         from rhodecode.model.db import CacheKey, Session, IntegrityError
 
         cache_obj = CacheKey.get_active_cache(self.cache_key)
         log.debug('Fetched cache obj %s using %s cache key.', cache_obj, self.cache_key)
 
         if not cache_obj:
             # generate new UID for non-existing cache object
             cache_state_uid = CacheKey.generate_new_state_uid()
             cache_obj = CacheKey(self.cache_key, cache_args=f'repo_state:{self._start_time}',
                                  cache_state_uid=cache_state_uid, cache_active=True)
             try:
                 Session().add(cache_obj)
                 Session().commit()
             except IntegrityError:
                 # if we catch integrity error, it means we inserted this object
                 # assumption is that's really an edge race-condition case and
                 # it's safe is to skip it
                 Session().rollback()
             except Exception:
                 log.exception('Failed to commit on cache key update')
                 Session().rollback()
                 if self.raise_exception:
                     raise
         return cache_obj
 
     def __enter__(self):
         log.debug('Entering cache invalidation check context: %s', self)
         self._start_time = time.time()
 
         self.cache_obj = self.get_or_create_cache_obj()
         cache_data = self.cache_obj.get_dict()
 
         return ActiveRegionCache(context=self, cache_data=cache_data)
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         # save compute time
         self.compute_time = time.time() - self._start_time