def update_data(self):
"""
Update cache.
Here we listen to changes in STATE_DB TRANSCEIVER_INFO table
and update data only when there is a change (SET, DELETE)
"""
# This code is not executed in unit test, since mockredis
# does not support pubsub
if not self.pubsub:
redis_client = self.statedb.get_redis_client(self.statedb.STATE_DB)
db = self.statedb.get_dbid(self.statedb.STATE_DB)
self.pubsub = redis_client.pubsub()
self.pubsub.psubscribe("__keyspace@{}__:{}".format(
db, self.TRANSCEIVER_KEY_PATTERN))
while True:
msg = self.pubsub.get_message()
if not msg:
break
transceiver_entry = msg["channel"].split(b":")[-1].decode()
data = msg['data'] # event data
# extract interface name
interface = transceiver_entry.split(
mibs.TABLE_NAME_SEPARATOR_VBAR)[-1]
# get interface from interface name
ifindex = port_util.get_index_from_str(interface)
if ifindex is None:
# interface name invalid, skip this entry
mibs.logger.warning("Invalid interface name in {} \
in STATE_DB, skipping".format(transceiver_entry))
continue
if b"set" in data:
self._update_transceiver_cache(interface)
elif b"del" in data:
# remove deleted transceiver
remove_sub_ids = [mibs.get_transceiver_sub_id(ifindex)]
# remove all sensor OIDs associated with removed transceiver
for sensor in SENSOR_NAME_MAP:
remove_sub_ids.append(
mibs.get_transceiver_sensor_sub_id(ifindex, sensor))
for sub_id in remove_sub_ids:
if sub_id and sub_id in self.physical_entities:
self.physical_entities.remove(sub_id)
def _update_transceiver_cache(self, interface):
"""
Update data for single transceiver
:param: interface: Interface name associated with transceiver
"""
# get interface from interface name
ifindex = port_util.get_index_from_str(interface)
# update xcvr info from DB
# use port's name as key for transceiver info entries
sub_id = mibs.get_transceiver_sub_id(ifindex)
# add interface to available OID list
insort_right(self.physical_entities, sub_id)
# get transceiver information from transceiver info entry in STATE DB
transceiver_info = Namespace.dbs_get_all(
self.statedb, mibs.STATE_DB,
mibs.transceiver_info_table(interface))
if not transceiver_info:
return
# physical class - network port
self.physical_classes_map[sub_id] = PhysicalClass.PORT
# save values into cache
sfp_type, \
self.physical_hw_version_map[sub_id],\
self.physical_serial_number_map[sub_id], \
self.physical_mfg_name_map[sub_id], \
self.physical_model_name_map[sub_id] = get_transceiver_data(transceiver_info)
ifalias = self.if_alias_map.get(interface.encode(), b"").decode()
# generate a description for this transceiver
self.physical_description_map[sub_id] = get_transceiver_description(
sfp_type, ifalias)
# update transceiver sensor cache
self._update_transceiver_sensor_cache(interface)
