def clear_memcache():
"""Flush memcahce if available"""
if not has_memcache():
return
get_cache_manager().clean()
def clear_memcache():
"""Flush memcahce if available"""
if not has_memcache():
return
get_cache_manager().clean()
def update_memcache_after_commit(context):
"""
The memccache entries is updated after DB commit
Logs error if there are errors in updating entries in cache
Args:
context: POST/PUT/DELETE HTTP request or import Converter contextual object
modified_objects: objects in cache maintained prior to committing to DB
Returns:
None
"""
if not has_memcache():
return
if context.cache_manager is None:
logger.error("CACHE: Error in initiaizing cache manager")
return
cache_manager = context.cache_manager
related_objs = list()
for val in getattr(flask.g, "referenced_objects", {}).itervalues():
obj_list = val.values()
if obj_list:
related_objs.append((obj_list[0], None))
memcache_mark_for_deletion(context, related_objs)
# TODO(dan): check for duplicates in marked_for_delete
if cache_manager.marked_for_delete:
delete_result = cache_manager.bulk_delete(
cache_manager.marked_for_delete, 0)
# TODO(dan): handling failure including network errors,
# currently we log errors
if delete_result is not True:
logger.error("CACHE: Failed to remove collection from cache")
status_entries = []
for key in cache_manager.marked_for_delete:
status_entries.append('DeleteOp:' + str(key))
if status_entries:
delete_result = cache_manager.bulk_delete(status_entries, 0)
# TODO(dan): handling failure including network errors,
# currently we log errors
if delete_result is not True:
logger.error("CACHE: Failed to remove status entries from cache")
clear_permission_cache()
cache_manager.clear_cache()
def clear_permission_cache():
"""Drop cached permissions for all users."""
if not has_memcache():
return
client = get_cache_manager().cache_object.memcache_client
# We delete all the cached user permissions as well as
# the permissions:list value itself
keys_to_delete = ['permissions:list']
for user_key in client.get('permissions:list') or set():
keys_to_delete.append(user_key)
keys_to_delete.extend(blob_get_chunk_keys(client, user_key))
client.delete_multi(keys_to_delete)
def clear_permission_cache():
"""Drop cached permissions for all users."""
if not has_memcache():
return
client = get_cache_manager().cache_object.memcache_client
# We delete all the cached user permissions as well as
# the permissions:list value itself
keys_to_delete = list('permissions:list')
for user_key in client.get('permissions:list') or set():
keys_to_delete.append(user_key)
keys_to_delete.extend(blob_get_chunk_keys(client, user_key))
client.delete_multi(keys_to_delete)
def update_memcache_before_commit(context, modified_objects, expiry_time):
"""
Preparing the memccache entries to be updated before DB commit
Also update the memcache to indicate the status cache operation
'InProgress' waiting for DB commit
Raises Exception on failures, cannot proceed with DB commit
Args:
context: POST/PUT/DELETE HTTP request or import Converter contextual object
modified_objects: objects in cache maintained prior to committing to DB
expiry_time: Expiry time specified for memcache ADD and DELETE
Returns:
None
"""
if not has_memcache():
return
context.cache_manager = get_cache_manager()
if modified_objects is not None:
if modified_objects.new:
memcache_mark_for_deletion(context, modified_objects.new.items())
if modified_objects.dirty:
memcache_mark_for_deletion(context, modified_objects.dirty.items())
if modified_objects.deleted:
memcache_mark_for_deletion(context,
modified_objects.deleted.items())
status_entries = {}
for key in context.cache_manager.marked_for_delete:
build_cache_status(status_entries, 'DeleteOp:' + key, expiry_time,
'InProgress')
if status_entries:
logger.info("CACHE: status entries: %s", status_entries)
ret = context.cache_manager.bulk_add(status_entries, expiry_time)
if ret:
if ret == status_entries:
logger.error(
'CACHE: Unable to add status for newly created entries '
'because of Network/RPC/Server errors')
else:
logger.error(
'CACHE: Newly created entries already exist in cache: %s',
ret)
def clear_users_permission_cache(user_ids):
""" Drop cached permissions for a list of users. """
if not has_memcache() or not user_ids:
return
client = get_cache_manager().cache_object.memcache_client
keys_to_delete = list()
cached_keys_set = client.get('permissions:list') or set()
for user_id in user_ids:
key = 'permissions:{}'.format(user_id)
if key in cached_keys_set:
cached_keys_set.remove(key)
keys_to_delete.append(key)
keys_to_delete.extend(blob_get_chunk_keys(client, key))
client.set('permissions:list', cached_keys_set)
client.delete_multi(keys_to_delete)
def clear_users_permission_cache(user_ids):
""" Drop cached permissions for a list of users. """
if not has_memcache() or not user_ids:
return
client = get_cache_manager().cache_object.memcache_client
keys_to_delete = list()
cached_keys_set = client.get('permissions:list') or set()
for user_id in user_ids:
key = 'permissions:{}'.format(user_id)
if key in cached_keys_set:
cached_keys_set.remove(key)
keys_to_delete.append(key)
keys_to_delete.extend(blob_get_chunk_keys(client, key))
client.set('permissions:list', cached_keys_set)
client.delete_multi(keys_to_delete)
def update_memcache_before_commit(context, modified_objects, expiry_time):
"""
Preparing the memccache entries to be updated before DB commit
Also update the memcache to indicate the status cache operation
'InProgress' waiting for DB commit
Raises Exception on failures, cannot proceed with DB commit
Args:
context: POST/PUT/DELETE HTTP request or import Converter contextual object
modified_objects: objects in cache maintained prior to committing to DB
expiry_time: Expiry time specified for memcache ADD and DELETE
Returns:
None
"""
if not has_memcache():
return
context.cache_manager = get_cache_manager()
if modified_objects is not None:
if modified_objects.new:
memcache_mark_for_deletion(context, modified_objects.new.items())
if modified_objects.dirty:
memcache_mark_for_deletion(context, modified_objects.dirty.items())
if modified_objects.deleted:
memcache_mark_for_deletion(context, modified_objects.deleted.items())
status_entries = {}
for key in context.cache_manager.marked_for_delete:
build_cache_status(status_entries, 'DeleteOp:' + key,
expiry_time, 'InProgress')
if status_entries:
logger.info("CACHE: status entries: %s", status_entries)
ret = context.cache_manager.bulk_add(status_entries, expiry_time)
if ret:
if ret == status_entries:
logger.error('CACHE: Unable to add status for newly created entries '
'because of Network/RPC/Server errors')
else:
logger.error('CACHE: Newly created entries already exist in cache: %s',
ret)
