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community.general/lib/ansible/executor/play_iterator.py
James Cammarata 5d92b00d9c Cleanup some include logic
* Properly mark hosts with failures in includes as failed
* Don't send callbacks until we're sure we're done, and also fix how
  we increment stats so failures don't show up as ok's
* Fix a bug in the include file logic where a failed include could lead
  to an infinite loop in the task iteration logic

Fixes #12933
2015-10-28 14:02:24 -04:00

433 lines
19 KiB
Python

# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import fnmatch
from ansible.compat.six import iteritems
from ansible import constants as C
from ansible.errors import AnsibleError
from ansible.playbook.block import Block
from ansible.playbook.task import Task
from ansible.utils.boolean import boolean
__all__ = ['PlayIterator']
try:
from __main__ import display
except ImportError:
from ansible.utils.display import Display
display = Display()
class HostState:
def __init__(self, blocks):
self._blocks = blocks[:]
self.cur_block = 0
self.cur_regular_task = 0
self.cur_rescue_task = 0
self.cur_always_task = 0
self.cur_role = None
self.run_state = PlayIterator.ITERATING_SETUP
self.fail_state = PlayIterator.FAILED_NONE
self.pending_setup = False
self.tasks_child_state = None
self.rescue_child_state = None
self.always_child_state = None
def __repr__(self):
return "HOST STATE: block=%d, task=%d, rescue=%d, always=%d, role=%s, run_state=%d, fail_state=%d, pending_setup=%s, tasks child state? %s, rescue child state? %s, always child state? %s" % (
self.cur_block,
self.cur_regular_task,
self.cur_rescue_task,
self.cur_always_task,
self.cur_role,
self.run_state,
self.fail_state,
self.pending_setup,
self.tasks_child_state,
self.rescue_child_state,
self.always_child_state,
)
def get_current_block(self):
return self._blocks[self.cur_block]
def copy(self):
new_state = HostState(self._blocks)
new_state.cur_block = self.cur_block
new_state.cur_regular_task = self.cur_regular_task
new_state.cur_rescue_task = self.cur_rescue_task
new_state.cur_always_task = self.cur_always_task
new_state.cur_role = self.cur_role
new_state.run_state = self.run_state
new_state.fail_state = self.fail_state
new_state.pending_setup = self.pending_setup
if self.tasks_child_state is not None:
new_state.tasks_child_state = self.tasks_child_state.copy()
if self.rescue_child_state is not None:
new_state.rescue_child_state = self.rescue_child_state.copy()
if self.always_child_state is not None:
new_state.always_child_state = self.always_child_state.copy()
return new_state
class PlayIterator:
# the primary running states for the play iteration
ITERATING_SETUP = 0
ITERATING_TASKS = 1
ITERATING_RESCUE = 2
ITERATING_ALWAYS = 3
ITERATING_COMPLETE = 4
# the failure states for the play iteration, which are powers
# of 2 as they may be or'ed together in certain circumstances
FAILED_NONE = 0
FAILED_SETUP = 1
FAILED_TASKS = 2
FAILED_RESCUE = 4
FAILED_ALWAYS = 8
def __init__(self, inventory, play, play_context, variable_manager, all_vars, start_at_done=False):
self._play = play
self._blocks = []
for block in self._play.compile():
new_block = block.filter_tagged_tasks(play_context, all_vars)
if new_block.has_tasks():
self._blocks.append(new_block)
self._host_states = {}
for host in inventory.get_hosts(self._play.hosts):
self._host_states[host.name] = HostState(blocks=self._blocks)
# if the host's name is in the variable manager's fact cache, then set
# its _gathered_facts flag to true for smart gathering tests later
if host.name in variable_manager._fact_cache:
host._gathered_facts = True
# if we're looking to start at a specific task, iterate through
# the tasks for this host until we find the specified task
if play_context.start_at_task is not None and not start_at_done:
while True:
(s, task) = self.get_next_task_for_host(host, peek=True)
if s.run_state == self.ITERATING_COMPLETE:
break
if task.name == play_context.start_at_task or fnmatch.fnmatch(task.name, play_context.start_at_task) or \
task.get_name() == play_context.start_at_task or fnmatch.fnmatch(task.get_name(), play_context.start_at_task):
# we have our match, so clear the start_at_task field on the
# play context to flag that we've started at a task (and future
# plays won't try to advance)
play_context.start_at_task = None
break
else:
self.get_next_task_for_host(host)
# finally, reset the host's state to ITERATING_SETUP
self._host_states[host.name].run_state = self.ITERATING_SETUP
# Extend the play handlers list to include the handlers defined in roles
self._play.handlers.extend(play.compile_roles_handlers())
def get_host_state(self, host):
try:
return self._host_states[host.name].copy()
except KeyError:
raise AnsibleError("invalid host (%s) specified for playbook iteration" % host)
def get_next_task_for_host(self, host, peek=False):
display.debug("getting the next task for host %s" % host.name)
s = self.get_host_state(host)
task = None
if s.run_state == self.ITERATING_COMPLETE:
display.debug("host %s is done iterating, returning" % host.name)
return (None, None)
elif s.run_state == self.ITERATING_SETUP:
s.run_state = self.ITERATING_TASKS
s.pending_setup = True
# Gather facts if the default is 'smart' and we have not yet
# done it for this host; or if 'explicit' and the play sets
# gather_facts to True; or if 'implicit' and the play does
# NOT explicitly set gather_facts to False.
gathering = C.DEFAULT_GATHERING
implied = self._play.gather_facts is None or boolean(self._play.gather_facts)
if (gathering == 'implicit' and implied) or \
(gathering == 'explicit' and boolean(self._play.gather_facts)) or \
(gathering == 'smart' and implied and not host._gathered_facts):
if not peek:
# mark the host as having gathered facts
host.set_gathered_facts(True)
task = Task()
task.action = 'setup'
task.args = {}
task.set_loader(self._play._loader)
else:
s.pending_setup = False
if not task:
(s, task) = self._get_next_task_from_state(s, peek=peek)
if task and task._role:
# if we had a current role, mark that role as completed
if s.cur_role and task._role != s.cur_role and host.name in s.cur_role._had_task_run and not peek:
s.cur_role._completed[host.name] = True
s.cur_role = task._role
if not peek:
self._host_states[host.name] = s
display.debug("done getting next task for host %s" % host.name)
display.debug(" ^ task is: %s" % task)
display.debug(" ^ state is: %s" % s)
return (s, task)
def _get_next_task_from_state(self, state, peek):
task = None
# try and find the next task, given the current state.
while True:
# try to get the current block from the list of blocks, and
# if we run past the end of the list we know we're done with
# this block
try:
block = state._blocks[state.cur_block]
except IndexError:
state.run_state = self.ITERATING_COMPLETE
return (state, None)
if state.run_state == self.ITERATING_TASKS:
# clear the pending setup flag, since we're past that and it didn't fail
if state.pending_setup:
state.pending_setup = False
if state.fail_state & self.FAILED_TASKS == self.FAILED_TASKS:
state.run_state = self.ITERATING_RESCUE
elif state.cur_regular_task >= len(block.block):
state.run_state = self.ITERATING_ALWAYS
else:
task = block.block[state.cur_regular_task]
# if the current task is actually a child block, we dive into it
if isinstance(task, Block) or state.tasks_child_state is not None:
if state.tasks_child_state is None:
state.tasks_child_state = HostState(blocks=[task])
state.tasks_child_state.run_state = self.ITERATING_TASKS
state.tasks_child_state.cur_role = state.cur_role
(state.tasks_child_state, task) = self._get_next_task_from_state(state.tasks_child_state, peek=peek)
if task is None:
# check to see if the child state was failed, if so we need to
# fail here too so we don't continue iterating tasks
if state.tasks_child_state.fail_state != self.FAILED_NONE:
state.fail_state |= self.FAILED_TASKS
state.tasks_child_state = None
state.cur_regular_task += 1
continue
else:
state.cur_regular_task += 1
elif state.run_state == self.ITERATING_RESCUE:
if state.fail_state & self.FAILED_RESCUE == self.FAILED_RESCUE:
state.run_state = self.ITERATING_ALWAYS
elif state.cur_rescue_task >= len(block.rescue):
if len(block.rescue) > 0:
state.fail_state = self.FAILED_NONE
state.run_state = self.ITERATING_ALWAYS
else:
task = block.rescue[state.cur_rescue_task]
if isinstance(task, Block) or state.rescue_child_state is not None:
if state.rescue_child_state is None:
state.rescue_child_state = HostState(blocks=[task])
state.rescue_child_state.run_state = self.ITERATING_TASKS
state.rescue_child_state.cur_role = state.cur_role
(state.rescue_child_state, task) = self._get_next_task_from_state(state.rescue_child_state, peek=peek)
if task is None:
# check to see if the child state was failed, if so we need to
# fail here too so we don't continue iterating rescue
if state.rescue_child_state.fail_state != self.FAILED_NONE:
state.fail_state |= self.FAILED_RESCUE
state.rescue_child_state = None
state.cur_rescue_task += 1
continue
else:
state.cur_rescue_task += 1
elif state.run_state == self.ITERATING_ALWAYS:
if state.cur_always_task >= len(block.always):
if state.fail_state != self.FAILED_NONE:
state.run_state = self.ITERATING_COMPLETE
else:
state.cur_block += 1
state.cur_regular_task = 0
state.cur_rescue_task = 0
state.cur_always_task = 0
state.run_state = self.ITERATING_TASKS
state.child_state = None
else:
task = block.always[state.cur_always_task]
if isinstance(task, Block) or state.always_child_state is not None:
if state.always_child_state is None:
state.always_child_state = HostState(blocks=[task])
state.always_child_state.run_state = self.ITERATING_TASKS
state.always_child_state.cur_role = state.cur_role
(state.always_child_state, task) = self._get_next_task_from_state(state.always_child_state, peek=peek)
if task is None:
# check to see if the child state was failed, if so we need to
# fail here too so we don't continue iterating always
if state.always_child_state.fail_state != self.FAILED_NONE:
state.fail_state |= self.FAILED_ALWAYS
state.always_child_state = None
state.cur_always_task += 1
continue
else:
state.cur_always_task += 1
elif state.run_state == self.ITERATING_COMPLETE:
return (state, None)
# if something above set the task, break out of the loop now
if task:
break
return (state, task)
def _set_failed_state(self, state):
if state.pending_setup:
state.fail_state |= self.FAILED_SETUP
state.run_state = self.ITERATING_COMPLETE
elif state.run_state == self.ITERATING_TASKS:
if state.tasks_child_state is not None:
state.tasks_child_state = self._set_failed_state(state.tasks_child_state)
else:
state.fail_state |= self.FAILED_TASKS
state.run_state = self.ITERATING_RESCUE
elif state.run_state == self.ITERATING_RESCUE:
if state.rescue_child_state is not None:
state.rescue_child_state = self._set_failed_state(state.rescue_child_state)
else:
state.fail_state |= self.FAILED_RESCUE
state.run_state = self.ITERATING_ALWAYS
elif state.run_state == self.ITERATING_ALWAYS:
if state.always_child_state is not None:
state.always_child_state = self._set_failed_state(state.always_child_state)
else:
state.fail_state |= self.FAILED_ALWAYS
state.run_state = self.ITERATING_COMPLETE
return state
def mark_host_failed(self, host):
s = self.get_host_state(host)
s = self._set_failed_state(s)
self._host_states[host.name] = s
def get_failed_hosts(self):
return dict((host, True) for (host, state) in iteritems(self._host_states) if state.run_state == self.ITERATING_COMPLETE and state.fail_state != self.FAILED_NONE)
def get_original_task(self, host, task):
'''
Finds the task in the task list which matches the UUID of the given task.
The executor engine serializes/deserializes objects as they are passed through
the different processes, and not all data structures are preserved. This method
allows us to find the original task passed into the executor engine.
'''
def _search_block(block, task):
'''
helper method to check a block's task lists (block/rescue/always)
for a given task uuid. If a Block is encountered in the place of a
task, it will be recursively searched (this happens when a task
include inserts one or more blocks into a task list).
'''
for b in (block.block, block.rescue, block.always):
for t in b:
if isinstance(t, Block):
res = _search_block(t, task)
if res:
return res
elif t._uuid == task._uuid:
return t
return None
def _search_state(state, task):
for block in state._blocks:
res = _search_block(block, task)
if res:
return res
for child_state in (state.tasks_child_state, state.rescue_child_state, state.always_child_state):
if child_state is not None:
res = _search_state(child_state, task)
if res:
return res
return None
s = self.get_host_state(host)
res = _search_state(s, task)
if res:
return res
for block in self._play.handlers:
res = _search_block(block, task)
if res:
return res
return None
def _insert_tasks_into_state(self, state, task_list):
if state.fail_state != self.FAILED_NONE:
return state
if state.run_state == self.ITERATING_TASKS:
if state.tasks_child_state:
state.tasks_child_state = self._insert_tasks_into_state(state.tasks_child_state, task_list)
else:
target_block = state._blocks[state.cur_block].copy(exclude_parent=True)
before = target_block.block[:state.cur_regular_task]
after = target_block.block[state.cur_regular_task:]
target_block.block = before + task_list + after
state._blocks[state.cur_block] = target_block
elif state.run_state == self.ITERATING_RESCUE:
if state.rescue_child_state:
state.rescue_child_state = self._insert_tasks_into_state(state.rescue_child_state, task_list)
else:
target_block = state._blocks[state.cur_block].copy(exclude_parent=True)
before = target_block.rescue[:state.cur_rescue_task]
after = target_block.rescue[state.cur_rescue_task:]
target_block.rescue = before + task_list + after
state._blocks[state.cur_block] = target_block
elif state.run_state == self.ITERATING_ALWAYS:
if state.always_child_state:
state.always_child_state = self._insert_tasks_into_state(state.always_child_state, task_list)
else:
target_block = state._blocks[state.cur_block].copy(exclude_parent=True)
before = target_block.always[:state.cur_always_task]
after = target_block.always[state.cur_always_task:]
target_block.always = before + task_list + after
state._blocks[state.cur_block] = target_block
return state
def add_tasks(self, host, task_list):
self._host_states[host.name] = self._insert_tasks_into_state(self.get_host_state(host), task_list)