def delete_stack(self, cnxt, stack_identity):
"""
The delete_stack method deletes a given stack.
:param cnxt: RPC context.
:param stack_identity: Name of the stack you want to delete.
"""
def remote_stop(lock_engine_id):
rpc = proxy.RpcProxy(lock_engine_id, "1.0")
msg = rpc.make_msg("stop_stack", stack_identity=stack_identity)
timeout = cfg.CONF.engine_life_check_timeout
try:
rpc.call(cnxt, msg, topic=lock_engine_id, timeout=timeout)
except rpc_common.Timeout:
return False
st = self._get_stack(cnxt, stack_identity)
logger.info(_('Deleting stack %s') % st.name)
stack = parser.Stack.load(cnxt, stack=st)
lock = stack_lock.StackLock(cnxt, stack, self.engine_id)
acquire_result = lock.try_acquire()
# Successfully acquired lock
if acquire_result is None:
self.thread_group_mgr.start_with_acquired_lock(stack, lock,
stack.delete)
return
# Current engine has the lock
elif acquire_result == self.engine_id:
self.thread_group_mgr.stop(stack.id)
# Another active engine has the lock
elif stack_lock.StackLock.engine_alive(cnxt, acquire_result):
stop_result = remote_stop(acquire_result)
if stop_result is None:
logger.debug(_("Successfully stopped remote task on engine %s")
% acquire_result)
else:
raise exception.StopActionFailed(stack_name=stack.name,
engine_id=acquire_result)
# If the lock isn't released here, then the call to
# start_with_lock below will raise an ActionInProgress
# exception. Ideally, we wouldn't be calling another
# release() here, since it should be called as soon as the
# ThreadGroup is stopped. But apparently there's a race
# between release() the next call to lock.acquire().
db_api.stack_lock_release(stack.id, acquire_result)
# There may be additional resources that we don't know about
# if an update was in-progress when the stack was stopped, so
# reload the stack from the database.
st = self._get_stack(cnxt, stack_identity)
stack = parser.Stack.load(cnxt, stack=st)
self.thread_group_mgr.start_with_lock(cnxt, stack, self.engine_id,
stack.delete)
return None
def delete_stack(self, cnxt, stack_identity):
"""
The delete_stack method deletes a given stack.
:param cnxt: RPC context.
:param stack_identity: Name of the stack you want to delete.
"""
def remote_stop(lock_engine_id):
timeout = cfg.CONF.engine_life_check_timeout
self.cctxt = self._client.prepare(version='1.0',
timeout=timeout,
topic=lock_engine_id)
try:
self.cctxt.call(cnxt,
'stop_stack',
stack_identity=stack_identity)
except messaging.MessagingTimeout:
return False
st = self._get_stack(cnxt, stack_identity)
LOG.info(_('Deleting stack %s') % st.name)
stack = parser.Stack.load(cnxt, stack=st)
lock = stack_lock.StackLock(cnxt, stack, self.engine_id)
with lock.try_thread_lock(stack.id) as acquire_result:
# Successfully acquired lock
if acquire_result is None:
self.thread_group_mgr.stop_timers(stack.id)
self.thread_group_mgr.start_with_acquired_lock(
stack, lock, stack.delete)
return
# Current engine has the lock
if acquire_result == self.engine_id:
# give threads which are almost complete an opportunity to
# finish naturally before force stopping them
eventlet.sleep(0.2)
self.thread_group_mgr.stop(stack.id)
# Another active engine has the lock
elif stack_lock.StackLock.engine_alive(cnxt, acquire_result):
stop_result = remote_stop(acquire_result)
if stop_result is None:
LOG.debug("Successfully stopped remote task on engine %s" %
acquire_result)
else:
raise exception.StopActionFailed(stack_name=stack.name,
engine_id=acquire_result)
# There may be additional resources that we don't know about
# if an update was in-progress when the stack was stopped, so
# reload the stack from the database.
st = self._get_stack(cnxt, stack_identity)
stack = parser.Stack.load(cnxt, stack=st)
self.thread_group_mgr.start_with_lock(cnxt, stack, self.engine_id,
stack.delete)
return None