def _remove_stale_session(util: ConsulUtil) -> None:
'''Destroys a stale RC leader session if it exists or does nothing otherwise.
An RC leader session may survive 'hctl shutdown'. In such a case 'leader'
key will contain a garbage value 'elect2805' but the session will be alive
and thus RC leader will not be re-elected.
'''
if not util.kv.kv_get_raw('leader'):
# No leader key means that there can be no stale RC leader session for
# sure. We're starting for the first time against a fresh Consul KV.
return
sess = util.get_leader_session_no_wait()
# We might face situation where we have stale session such that we have
# 'session' present but 'value' is not present for leader key.
# In such situation we need to destroy the session so that RC re-election
# can be triggered automatically
if util.is_leader_value_present_for_session():
node = util.get_leader_node()
if re.match(r'^elect[\d]+$', node):
LOG.debug(
'Stale leader session found: RC leader session %s is '
'found while the leader node seems to be '
'stub: %s', sess, node)
util.destroy_session(sess)
LOG.debug('Stale session %s destroyed '
'to enable RC re-election', sess)
else:
util.destroy_session(sess)
LOG.debug('Stale session %s destroyed to enable RC re-election', sess)
def _remove_stale_session(util: ConsulUtil) -> None:
'''Destroys a stale RC leader session if it exists or does nothing otherwise.
An RC leader session may survive 'hctl shutdown'. In such a case 'leader'
key will contain a garbage value 'elect2805' but the session will be alive
and thus RC leader will not be re-elected.
'''
if not util.kv.kv_get_raw('leader'):
# No leader key means that there can be no stale RC leader session for
# sure. We're starting for the first time against a fresh Consul KV.
return
sess = util.get_leader_session_no_wait()
node = util.get_leader_node()
if re.match(r'^elect[\d]+$', node):
LOG.debug(
'Stale leader session found: RC leader session %s is '
'found while the leader node seems to be stub: %s', sess, node)
util.destroy_session(sess)
LOG.debug('Stale session %s destroyed to enable RC re-election', sess)