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Reworking iterator logic regarding failed states during always

Browse source 
Previous changes addressed a corner case, which unfortunately introduced
another bug. This patch adds a new flag to the host state (did_rescue) which
is set to true when the rescue portion of a block completes. This flag is
then checked in _check_failed_state() when the fail_state != FAILED_NONE.

This lead to the discovery of another bug - current strategies are not advancing
hosts to ITERATING_COMPLETE after doing a peek at the next task, leaving the
host state in the run_state of the final task. To address this, before gathering
the list of failed hosts in StrategyBase.run(), a final pass through the iterator
for all hosts is done to ensure each host is in its final state. This way, no
strategy derived from StrategyBase has to worry about it and it's handled.

Fixes #17983
This commit is contained in:
James Cammarata 2016-11-16 02:01:30 -06:00
parent afaec3da82
commit ca5b361ad8
3 changed files with 34 additions and 21 deletions
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10
lib/ansible/executor/play_iterator.py
View file

@ -57,6 +57,7 @@ class HostState:
self.tasks_child_state = None self.tasks_child_state = None
self.rescue_child_state = None self.rescue_child_state = None
self.always_child_state = None self.always_child_state = None
self.did_rescue = False
self.did_start_at_task = False self.did_start_at_task = False
def __repr__(self): def __repr__(self):
@ -81,7 +82,7 @@ class HostState:
ret.append(states[i]) ret.append(states[i])
return "|".join(ret) return "|".join(ret)
return "HOST STATE: block=%d, task=%d, rescue=%d, always=%d, role=%s, run_state=%s, fail_state=%s, pending_setup=%s, tasks child state? (%s), rescue child state? (%s), always child state? (%s), did start at task? %s" % ( return "HOST STATE: block=%d, task=%d, rescue=%d, always=%d, role=%s, run_state=%s, fail_state=%s, pending_setup=%s, tasks child state? (%s), rescue child state? (%s), always child state? (%s), did rescue? %s, did start at task? %s" % (
self.cur_block, self.cur_block,
self.cur_regular_task, self.cur_regular_task,
self.cur_rescue_task, self.cur_rescue_task,
@ -93,6 +94,7 @@ class HostState:
self.tasks_child_state, self.tasks_child_state,
self.rescue_child_state, self.rescue_child_state,
self.always_child_state, self.always_child_state,
self.did_rescue,
self.did_start_at_task, self.did_start_at_task,
) )
@ -123,6 +125,7 @@ class HostState:
new_state.run_state = self.run_state new_state.run_state = self.run_state
new_state.fail_state = self.fail_state new_state.fail_state = self.fail_state
new_state.pending_setup = self.pending_setup new_state.pending_setup = self.pending_setup
new_state.did_rescue = self.did_rescue
new_state.did_start_at_task = self.did_start_at_task new_state.did_start_at_task = self.did_start_at_task
if self.cur_dep_chain is not None: if self.cur_dep_chain is not None:
new_state.cur_dep_chain = self.cur_dep_chain[:] new_state.cur_dep_chain = self.cur_dep_chain[:]
@ -412,6 +415,7 @@ class PlayIterator:
if len(block.rescue) > 0: if len(block.rescue) > 0:
state.fail_state = self.FAILED_NONE state.fail_state = self.FAILED_NONE
state.run_state = self.ITERATING_ALWAYS state.run_state = self.ITERATING_ALWAYS
state.did_rescue = True
else: else:
task = block.rescue[state.cur_rescue_task] task = block.rescue[state.cur_rescue_task]
if isinstance(task, Block) or state.rescue_child_state is not None: if isinstance(task, Block) or state.rescue_child_state is not None:
@ -434,6 +438,7 @@ class PlayIterator:
else: else:
if task is None or state.always_child_state.run_state == self.ITERATING_COMPLETE: if task is None or state.always_child_state.run_state == self.ITERATING_COMPLETE:
state.always_child_state = None state.always_child_state = None
continue
else: else:
if state.cur_always_task >= len(block.always): if state.cur_always_task >= len(block.always):
if state.fail_state != self.FAILED_NONE: if state.fail_state != self.FAILED_NONE:
@ -447,6 +452,7 @@ class PlayIterator:
state.tasks_child_state = None state.tasks_child_state = None
state.rescue_child_state = None state.rescue_child_state = None
state.always_child_state = None state.always_child_state = None
state.did_rescue = False
else: else:
task = block.always[state.cur_always_task] task = block.always[state.cur_always_task]
if isinstance(task, Block) or state.always_child_state is not None: if isinstance(task, Block) or state.always_child_state is not None:
@ -521,7 +527,7 @@ class PlayIterator:
elif state.run_state == self.ITERATING_ALWAYS and state.fail_state&self.FAILED_ALWAYS == 0: elif state.run_state == self.ITERATING_ALWAYS and state.fail_state&self.FAILED_ALWAYS == 0:
return False return False
else: else:
return True return not state.did_rescue
elif state.run_state == self.ITERATING_TASKS and self._check_failed_state(state.tasks_child_state): elif state.run_state == self.ITERATING_TASKS and self._check_failed_state(state.tasks_child_state):
cur_block = self._blocks[state.cur_block] cur_block = self._blocks[state.cur_block]
if len(cur_block.rescue) > 0 and state.fail_state & self.FAILED_RESCUE == 0: if len(cur_block.rescue) > 0 and state.fail_state & self.FAILED_RESCUE == 0:

41
lib/ansible/plugins/strategy/__init__.py
View file

@ -129,6 +129,12 @@ class StrategyBase:
self._results_thread.join() self._results_thread.join()
def run(self, iterator, play_context, result=0): def run(self, iterator, play_context, result=0):
# execute one more pass through the iterator without peeking, to
# make sure that all of the hosts are advanced to their final task.
# This should be safe, as everything should be ITERATING_COMPLETE by
# this point, though the strategy may not advance the hosts itself.
[iterator.get_next_task_for_host(host) for host in self._inventory.get_hosts(iterator._play.hosts) if host.name not in self._tqm._unreachable_hosts]
# save the failed/unreachable hosts, as the run_handlers() # save the failed/unreachable hosts, as the run_handlers()
# method will clear that information during its execution # method will clear that information during its execution
failed_hosts = iterator.get_failed_hosts() failed_hosts = iterator.get_failed_hosts()
@ -348,24 +354,25 @@ class StrategyBase:
else: else:
iterator.mark_host_failed(original_host) iterator.mark_host_failed(original_host)
# only add the host to the failed list officially if it has # increment the failed count for this host
# been failed by the iterator self._tqm._stats.increment('failures', original_host.name)
if iterator.is_failed(original_host):
# grab the current state and if we're iterating on the rescue portion
# of a block then we save the failed task in a special var for use
# within the rescue/always
state, _ = iterator.get_next_task_for_host(original_host, peek=True)
if iterator.is_failed(original_host) and state and state.run_state == iterator.ITERATING_COMPLETE:
self._tqm._failed_hosts[original_host.name] = True self._tqm._failed_hosts[original_host.name] = True
self._tqm._stats.increment('failures', original_host.name)
else: if state and state.run_state == iterator.ITERATING_RESCUE:
# otherwise, we grab the current state and if we're iterating on self._variable_manager.set_nonpersistent_facts(
# the rescue portion of a block then we save the failed task in a original_host,
# special var for use within the rescue/always dict(
state, _ = iterator.get_next_task_for_host(original_host, peek=True) ansible_failed_task=original_task.serialize(),
if state.run_state == iterator.ITERATING_RESCUE: ansible_failed_result=task_result._result,
self._variable_manager.set_nonpersistent_facts( ),
original_host, )
dict(
ansible_failed_task=original_task.serialize(),
ansible_failed_result=task_result._result,
),
)
else: else:
self._tqm._stats.increment('ok', original_host.name) self._tqm._stats.increment('ok', original_host.name)
if 'changed' in task_result._result and task_result._result['changed']: if 'changed' in task_result._result and task_result._result['changed']:

4
test/units/plugins/strategy/test_strategy_base.py
View file

@ -331,8 +331,8 @@ class TestStrategyBase(unittest.TestCase):
self.assertEqual(results[0], task_result) self.assertEqual(results[0], task_result)
self.assertEqual(strategy_base._pending_results, 0) self.assertEqual(strategy_base._pending_results, 0)
self.assertNotIn('test01', strategy_base._blocked_hosts) self.assertNotIn('test01', strategy_base._blocked_hosts)
self.assertIn('test01', mock_tqm._failed_hosts) #self.assertIn('test01', mock_tqm._failed_hosts)
del mock_tqm._failed_hosts['test01'] #del mock_tqm._failed_hosts['test01']
mock_iterator.is_failed.return_value = False mock_iterator.is_failed.return_value = False
task_result = TaskResult(host=mock_host.name, task=mock_task._uuid, return_data='{"unreachable": true}') task_result = TaskResult(host=mock_host.name, task=mock_task._uuid, return_data='{"unreachable": true}')