def acquire(self, retry=True):
"""Acquire a lock on the stack.
:param retry: When True, retry if lock was released while stealing.
:type retry: boolean
"""
lock_engine_id = stack_lock_object.StackLock.create(self.context,
self.stack_id,
self.engine_id)
if lock_engine_id is None:
LOG.debug("Engine %(engine)s acquired lock on stack "
"%(stack)s" % {'engine': self.engine_id,
'stack': self.stack_id})
return
stack = stack_object.Stack.get_by_id(self.context, self.stack_id,
show_deleted=True,
eager_load=False)
if (lock_engine_id == self.engine_id or
service_utils.engine_alive(self.context, lock_engine_id)):
LOG.debug("Lock on stack %(stack)s is owned by engine "
"%(engine)s" % {'stack': self.stack_id,
'engine': lock_engine_id})
raise exception.ActionInProgress(stack_name=stack.name,
action=stack.action)
else:
LOG.info("Stale lock detected on stack %(stack)s. Engine "
"%(engine)s will attempt to steal the lock",
{'stack': self.stack_id, 'engine': self.engine_id})
result = stack_lock_object.StackLock.steal(self.context,
self.stack_id,
lock_engine_id,
self.engine_id)
if result is None:
LOG.info("Engine %(engine)s successfully stole the lock "
"on stack %(stack)s",
{'engine': self.engine_id,
'stack': self.stack_id})
return
elif result is True:
if retry:
LOG.info("The lock on stack %(stack)s was released "
"while engine %(engine)s was stealing it. "
"Trying again", {'stack': self.stack_id,
'engine': self.engine_id})
return self.acquire(retry=False)
else:
new_lock_engine_id = result
LOG.info("Failed to steal lock on stack %(stack)s. "
"Engine %(engine)s stole the lock first",
{'stack': self.stack_id,
'engine': new_lock_engine_id})
raise exception.ActionInProgress(
stack_name=stack.name, action=stack.action)
def acquire(self, retry=True):
"""Acquire a lock on the stack.
:param retry: When True, retry if lock was released while stealing.
:type retry: boolean
"""
lock_engine_id = stack_lock_object.StackLock.create(self.context,
self.stack_id,
self.engine_id)
if lock_engine_id is None:
LOG.debug("Engine %(engine)s acquired lock on stack "
"%(stack)s" % {'engine': self.engine_id,
'stack': self.stack_id})
return
stack = stack_object.Stack.get_by_id(self.context, self.stack_id,
show_deleted=True,
eager_load=False)
if (lock_engine_id == self.engine_id or
service_utils.engine_alive(self.context, lock_engine_id)):
LOG.debug("Lock on stack %(stack)s is owned by engine "
"%(engine)s" % {'stack': self.stack_id,
'engine': lock_engine_id})
raise exception.ActionInProgress(stack_name=stack.name,
action=stack.action)
else:
LOG.info(_LI("Stale lock detected on stack %(stack)s. Engine "
"%(engine)s will attempt to steal the lock"),
{'stack': self.stack_id, 'engine': self.engine_id})
result = stack_lock_object.StackLock.steal(self.context,
self.stack_id,
lock_engine_id,
self.engine_id)
if result is None:
LOG.info(_LI("Engine %(engine)s successfully stole the lock "
"on stack %(stack)s"),
{'engine': self.engine_id,
'stack': self.stack_id})
return
elif result is True:
if retry:
LOG.info(_LI("The lock on stack %(stack)s was released "
"while engine %(engine)s was stealing it. "
"Trying again"), {'stack': self.stack_id,
'engine': self.engine_id})
return self.acquire(retry=False)
else:
new_lock_engine_id = result
LOG.info(_LI("Failed to steal lock on stack %(stack)s. "
"Engine %(engine)s stole the lock first"),
{'stack': self.stack_id,
'engine': new_lock_engine_id})
raise exception.ActionInProgress(
stack_name=stack.name, action=stack.action)