def _process_collection_event(memcached_client, event_data):
log = logging.getLogger("_process_collection_event")
if event_data["event"] != "UPDATE":
log.error("unknown event {0}".format(event_data))
return
lookup_fields = [
"id",
"name",
]
for lookup_field in lookup_fields:
key = memcached_central_key_template.format(
"collection", lookup_field, event_data["old"][lookup_field])
result = memcached_client.delete(key)
log.info("delete {0} result = {1}".format(key, result))
# deleted collections have their name changed to have __deleted__$id__ at
# the front so that they do not conflict with future collections. in order
# to clear caches even when we have mass updates.
name = event_data['old']['name']
if name.startswith("__deleted__"):
undecorated_name = name[name.rindex("_") + 1:]
key = memcached_central_key_template.format("collection", "name",
undecorated_name)
result = memcached_client.delete(key)
log.info("delete {0} result = {1}".format(key, result))
def _process_collection_event(memcached_client, event_data):
log = logging.getLogger("_process_collection_event")
if event_data["event"] != "UPDATE":
log.error("unknown event {0}".format(event_data))
return
lookup_fields = ["id", "name", ]
for lookup_field in lookup_fields:
key = memcached_central_key_template.format(
"collection",
lookup_field,
event_data["old"][lookup_field])
result = memcached_client.delete(key)
log.info("delete {0} result = {1}".format(key, result))
# deleted collections have their name changed to have __deleted__$id__ at
# the front so that they do not conflict with future collections. in order
# to clear caches even when we have mass updates.
name = event_data['old']['name']
if name.startswith("__deleted__"):
undecorated_name = name[name.rindex("_") + 1:]
key = memcached_central_key_template.format(
"collection", "name", undecorated_name)
result = memcached_client.delete(key)
log.info("delete {0} result = {1}".format(key, result))
def get(self, lookup_field_value):
"""
retrieve a dict of column data from memcached, or database
return None if not found
"""
memcached_key = \
memcached_central_key_template.format(self._table_name,
self._lookup_field_name,
lookup_field_value)
cached_dict = self._memcached_client.get(memcached_key)
if cached_dict is not None:
self._log.debug("cache hit {0}".format(memcached_key))
return cached_dict
# cache miss, try the database
self._log.debug("cache miss {0}".format(memcached_key))
database_dict = self._database_lookup_function(lookup_field_value)
if database_dict is not None:
self._log.debug("database hit {0}".format(memcached_key))
success = \
self._memcached_client.set(memcached_key,
database_dict,
time=_expiration_time_in_seconds)
if not success:
self._log.error(
"self._memcached_client.set({0}...) returned {1}".format(
memcached_key, success))
if database_dict is None:
self._log.debug("database miss {0}".format(memcached_key))
return database_dict
def _process_customer_key_event(memcached_client, event_data):
log = logging.getLogger("_process_customer_key_event")
if event_data["event"] != "UPDATE":
log.error("unknown event {0}".format(event_data))
return
lookup_field = "id"
key = memcached_central_key_template.format(
"customer_key", lookup_field, event_data["old"][lookup_field])
result = memcached_client.delete(key)
log.info("delete {0} result = {1}".format(key, result))
def _process_customer_key_event(memcached_client, event_data):
log = logging.getLogger("_process_customer_key_event")
if event_data["event"] != "UPDATE":
log.error("unknown event {0}".format(event_data))
return
lookup_field = "id"
key = memcached_central_key_template.format(
"customer_key",
lookup_field,
event_data["old"][lookup_field])
result = memcached_client.delete(key)
log.info("delete {0} result = {1}".format(key, result))