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638 lines
30 KiB
Python
638 lines
30 KiB
Python
# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import annotations
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import fnmatch
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from enum import IntEnum, IntFlag
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from ansible import constants as C
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from ansible.errors import AnsibleAssertionError
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from ansible.module_utils.parsing.convert_bool import boolean
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from ansible.playbook.block import Block
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from ansible.playbook.task import Task
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from ansible.utils.display import Display
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display = Display()
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__all__ = ['PlayIterator', 'IteratingStates', 'FailedStates']
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class IteratingStates(IntEnum):
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SETUP = 0
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TASKS = 1
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RESCUE = 2
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ALWAYS = 3
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HANDLERS = 4
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COMPLETE = 5
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class FailedStates(IntFlag):
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NONE = 0
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SETUP = 1
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TASKS = 2
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RESCUE = 4
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ALWAYS = 8
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HANDLERS = 16 # NOTE not in use anymore
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class HostState:
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def __init__(self, blocks):
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self._blocks = blocks[:]
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self.handlers = []
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self.handler_notifications = []
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self.cur_block = 0
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self.cur_regular_task = 0
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self.cur_rescue_task = 0
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self.cur_always_task = 0
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self.cur_handlers_task = 0
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self.run_state = IteratingStates.SETUP
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self.fail_state = FailedStates.NONE
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self.pre_flushing_run_state = None
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self.update_handlers = True
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self.pending_setup = False
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self.tasks_child_state = None
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self.rescue_child_state = None
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self.always_child_state = None
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self.did_rescue = False
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self.did_start_at_task = False
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def __repr__(self):
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return "HostState(%r)" % self._blocks
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def __str__(self):
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return ("HOST STATE: block=%d, task=%d, rescue=%d, always=%d, handlers=%d, run_state=%s, fail_state=%s, "
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"pre_flushing_run_state=%s, update_handlers=%s, pending_setup=%s, "
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"tasks child state? (%s), rescue child state? (%s), always child state? (%s), "
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"did rescue? %s, did start at task? %s" % (
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self.cur_block,
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self.cur_regular_task,
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self.cur_rescue_task,
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self.cur_always_task,
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self.cur_handlers_task,
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self.run_state,
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self.fail_state,
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self.pre_flushing_run_state,
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self.update_handlers,
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self.pending_setup,
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self.tasks_child_state,
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self.rescue_child_state,
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self.always_child_state,
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self.did_rescue,
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self.did_start_at_task,
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))
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def __eq__(self, other):
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if not isinstance(other, HostState):
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return False
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for attr in ('_blocks',
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'cur_block', 'cur_regular_task', 'cur_rescue_task', 'cur_always_task', 'cur_handlers_task',
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'run_state', 'fail_state', 'pre_flushing_run_state', 'update_handlers', 'pending_setup',
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'tasks_child_state', 'rescue_child_state', 'always_child_state'):
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if getattr(self, attr) != getattr(other, attr):
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return False
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return True
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def get_current_block(self):
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return self._blocks[self.cur_block]
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def copy(self):
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new_state = HostState(self._blocks)
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new_state.handlers = self.handlers[:]
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new_state.handler_notifications = self.handler_notifications[:]
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new_state.cur_block = self.cur_block
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new_state.cur_regular_task = self.cur_regular_task
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new_state.cur_rescue_task = self.cur_rescue_task
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new_state.cur_always_task = self.cur_always_task
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new_state.cur_handlers_task = self.cur_handlers_task
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new_state.run_state = self.run_state
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new_state.fail_state = self.fail_state
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new_state.pre_flushing_run_state = self.pre_flushing_run_state
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new_state.update_handlers = self.update_handlers
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new_state.pending_setup = self.pending_setup
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new_state.did_rescue = self.did_rescue
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new_state.did_start_at_task = self.did_start_at_task
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if self.tasks_child_state is not None:
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new_state.tasks_child_state = self.tasks_child_state.copy()
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if self.rescue_child_state is not None:
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new_state.rescue_child_state = self.rescue_child_state.copy()
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if self.always_child_state is not None:
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new_state.always_child_state = self.always_child_state.copy()
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return new_state
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class PlayIterator:
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def __init__(self, inventory, play, play_context, variable_manager, all_vars, start_at_done=False):
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self._play = play
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self._blocks = []
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self._variable_manager = variable_manager
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setup_block = Block(play=self._play)
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# Gathering facts with run_once would copy the facts from one host to
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# the others.
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setup_block.run_once = False
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setup_task = Task(block=setup_block)
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setup_task.action = 'gather_facts'
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# TODO: hardcoded resolution here, but should use actual resolution code in the end,
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# in case of 'legacy' mismatch
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setup_task.resolved_action = 'ansible.builtin.gather_facts'
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setup_task.name = 'Gathering Facts'
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setup_task.args = {}
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# Unless play is specifically tagged, gathering should 'always' run
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if not self._play.tags:
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setup_task.tags = ['always']
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# Default options to gather
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for option in ('gather_subset', 'gather_timeout', 'fact_path'):
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value = getattr(self._play, option, None)
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if value is not None:
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setup_task.args[option] = value
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setup_task.set_loader(self._play._loader)
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# short circuit fact gathering if the entire playbook is conditional
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if self._play._included_conditional is not None:
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setup_task.when = self._play._included_conditional[:]
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setup_block.block = [setup_task]
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setup_block = setup_block.filter_tagged_tasks(all_vars)
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self._blocks.append(setup_block)
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# keep flatten (no blocks) list of all tasks from the play
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# used for the lockstep mechanism in the linear strategy
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self.all_tasks = setup_block.get_tasks()
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for block in self._play.compile():
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new_block = block.filter_tagged_tasks(all_vars)
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if new_block.has_tasks():
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self._blocks.append(new_block)
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self.all_tasks.extend(new_block.get_tasks())
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# keep list of all handlers, it is copied into each HostState
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# at the beginning of IteratingStates.HANDLERS
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# the copy happens at each flush in order to restore the original
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# list and remove any included handlers that might not be notified
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# at the particular flush
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self.handlers = [h for b in self._play.handlers for h in b.block]
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self._host_states = {}
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start_at_matched = False
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batch = inventory.get_hosts(self._play.hosts, order=self._play.order)
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self.batch_size = len(batch)
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for host in batch:
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self.set_state_for_host(host.name, HostState(blocks=self._blocks))
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# if we're looking to start at a specific task, iterate through
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# the tasks for this host until we find the specified task
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if play_context.start_at_task is not None and not start_at_done:
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while True:
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(s, task) = self.get_next_task_for_host(host, peek=True)
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if s.run_state == IteratingStates.COMPLETE:
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break
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if task.name == play_context.start_at_task or (task.name and fnmatch.fnmatch(task.name, play_context.start_at_task)) or \
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task.get_name() == play_context.start_at_task or fnmatch.fnmatch(task.get_name(), play_context.start_at_task):
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start_at_matched = True
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break
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self.set_state_for_host(host.name, s)
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# finally, reset the host's state to IteratingStates.SETUP
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if start_at_matched:
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self._host_states[host.name].did_start_at_task = True
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self._host_states[host.name].run_state = IteratingStates.SETUP
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if start_at_matched:
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# we have our match, so clear the start_at_task field on the
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# play context to flag that we've started at a task (and future
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# plays won't try to advance)
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play_context.start_at_task = None
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self.end_play = False
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self.cur_task = 0
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def get_host_state(self, host):
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# Since we're using the PlayIterator to carry forward failed hosts,
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# in the event that a previous host was not in the current inventory
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# we create a stub state for it now
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if host.name not in self._host_states:
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self.set_state_for_host(host.name, HostState(blocks=[]))
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return self._host_states[host.name].copy()
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def get_next_task_for_host(self, host, peek=False):
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display.debug("getting the next task for host %s" % host.name)
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s = self.get_host_state(host)
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task = None
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if s.run_state == IteratingStates.COMPLETE:
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display.debug("host %s is done iterating, returning" % host.name)
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return (s, None)
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(s, task) = self._get_next_task_from_state(s, host=host)
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if not peek:
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self.set_state_for_host(host.name, s)
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display.debug("done getting next task for host %s" % host.name)
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display.debug(" ^ task is: %s" % task)
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display.debug(" ^ state is: %s" % s)
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return (s, task)
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def _get_next_task_from_state(self, state, host):
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task = None
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# try and find the next task, given the current state.
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while True:
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# try to get the current block from the list of blocks, and
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# if we run past the end of the list we know we're done with
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# this block
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try:
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block = state._blocks[state.cur_block]
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except IndexError:
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state.run_state = IteratingStates.COMPLETE
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return (state, None)
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if state.run_state == IteratingStates.SETUP:
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# First, we check to see if we were pending setup. If not, this is
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# the first trip through IteratingStates.SETUP, so we set the pending_setup
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# flag and try to determine if we do in fact want to gather facts for
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# the specified host.
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if not state.pending_setup:
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state.pending_setup = True
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# Gather facts if the default is 'smart' and we have not yet
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# done it for this host; or if 'explicit' and the play sets
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# gather_facts to True; or if 'implicit' and the play does
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# NOT explicitly set gather_facts to False.
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gathering = C.DEFAULT_GATHERING
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implied = self._play.gather_facts is None or boolean(self._play.gather_facts, strict=False)
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if (gathering == 'implicit' and implied) or \
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(gathering == 'explicit' and boolean(self._play.gather_facts, strict=False)) or \
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(gathering == 'smart' and implied and not (self._variable_manager._fact_cache.get(host.name, {}).get('_ansible_facts_gathered', False))):
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# The setup block is always self._blocks[0], as we inject it
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# during the play compilation in __init__ above.
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setup_block = self._blocks[0]
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if setup_block.has_tasks() and len(setup_block.block) > 0:
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task = setup_block.block[0]
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else:
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# This is the second trip through IteratingStates.SETUP, so we clear
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# the flag and move onto the next block in the list while setting
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# the run state to IteratingStates.TASKS
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state.pending_setup = False
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state.run_state = IteratingStates.TASKS
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if not state.did_start_at_task:
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state.cur_block += 1
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state.cur_regular_task = 0
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state.cur_rescue_task = 0
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state.cur_always_task = 0
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state.tasks_child_state = None
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state.rescue_child_state = None
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state.always_child_state = None
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elif state.run_state == IteratingStates.TASKS:
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# clear the pending setup flag, since we're past that and it didn't fail
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if state.pending_setup:
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state.pending_setup = False
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# First, we check for a child task state that is not failed, and if we
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# have one recurse into it for the next task. If we're done with the child
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# state, we clear it and drop back to getting the next task from the list.
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if state.tasks_child_state:
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(state.tasks_child_state, task) = self._get_next_task_from_state(state.tasks_child_state, host=host)
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if self._check_failed_state(state.tasks_child_state):
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# failed child state, so clear it and move into the rescue portion
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state.tasks_child_state = None
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self._set_failed_state(state)
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else:
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# get the next task recursively
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if task is None or state.tasks_child_state.run_state == IteratingStates.COMPLETE:
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# we're done with the child state, so clear it and continue
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# back to the top of the loop to get the next task
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state.tasks_child_state = None
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continue
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else:
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# First here, we check to see if we've failed anywhere down the chain
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# of states we have, and if so we move onto the rescue portion. Otherwise,
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# we check to see if we've moved past the end of the list of tasks. If so,
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# we move into the always portion of the block, otherwise we get the next
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# task from the list.
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if self._check_failed_state(state):
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state.run_state = IteratingStates.RESCUE
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elif state.cur_regular_task >= len(block.block):
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state.run_state = IteratingStates.ALWAYS
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else:
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task = block.block[state.cur_regular_task]
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# if the current task is actually a child block, create a child
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# state for us to recurse into on the next pass
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if isinstance(task, Block):
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state.tasks_child_state = HostState(blocks=[task])
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state.tasks_child_state.run_state = IteratingStates.TASKS
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# since we've created the child state, clear the task
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# so we can pick up the child state on the next pass
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task = None
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state.cur_regular_task += 1
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elif state.run_state == IteratingStates.RESCUE:
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# The process here is identical to IteratingStates.TASKS, except instead
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# we move into the always portion of the block.
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if state.rescue_child_state:
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(state.rescue_child_state, task) = self._get_next_task_from_state(state.rescue_child_state, host=host)
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if self._check_failed_state(state.rescue_child_state):
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state.rescue_child_state = None
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self._set_failed_state(state)
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else:
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if task is None or state.rescue_child_state.run_state == IteratingStates.COMPLETE:
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state.rescue_child_state = None
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continue
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else:
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if state.fail_state & FailedStates.RESCUE == FailedStates.RESCUE:
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state.run_state = IteratingStates.ALWAYS
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elif state.cur_rescue_task >= len(block.rescue):
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if len(block.rescue) > 0:
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state.fail_state = FailedStates.NONE
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state.run_state = IteratingStates.ALWAYS
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state.did_rescue = True
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else:
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task = block.rescue[state.cur_rescue_task]
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if isinstance(task, Block):
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state.rescue_child_state = HostState(blocks=[task])
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state.rescue_child_state.run_state = IteratingStates.TASKS
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task = None
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state.cur_rescue_task += 1
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elif state.run_state == IteratingStates.ALWAYS:
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# And again, the process here is identical to IteratingStates.TASKS, except
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# instead we either move onto the next block in the list, or we set the
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# run state to IteratingStates.COMPLETE in the event of any errors, or when we
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# have hit the end of the list of blocks.
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if state.always_child_state:
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(state.always_child_state, task) = self._get_next_task_from_state(state.always_child_state, host=host)
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if self._check_failed_state(state.always_child_state):
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state.always_child_state = None
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self._set_failed_state(state)
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else:
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if task is None or state.always_child_state.run_state == IteratingStates.COMPLETE:
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state.always_child_state = None
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continue
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else:
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if state.cur_always_task >= len(block.always):
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if state.fail_state != FailedStates.NONE:
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state.run_state = IteratingStates.COMPLETE
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else:
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state.cur_block += 1
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state.cur_regular_task = 0
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state.cur_rescue_task = 0
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state.cur_always_task = 0
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state.run_state = IteratingStates.TASKS
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state.tasks_child_state = None
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state.rescue_child_state = None
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state.always_child_state = None
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state.did_rescue = False
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else:
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task = block.always[state.cur_always_task]
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if isinstance(task, Block):
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state.always_child_state = HostState(blocks=[task])
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state.always_child_state.run_state = IteratingStates.TASKS
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task = None
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state.cur_always_task += 1
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elif state.run_state == IteratingStates.HANDLERS:
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if state.update_handlers:
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# reset handlers for HostState since handlers from include_tasks
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# might be there from previous flush
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state.handlers = self.handlers[:]
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state.update_handlers = False
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while True:
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try:
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task = state.handlers[state.cur_handlers_task]
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except IndexError:
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task = None
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state.cur_handlers_task = 0
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state.run_state = state.pre_flushing_run_state
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state.update_handlers = True
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break
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else:
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state.cur_handlers_task += 1
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if task.is_host_notified(host):
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break
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elif state.run_state == IteratingStates.COMPLETE:
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return (state, None)
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# if something above set the task, break out of the loop now
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if task:
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break
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return (state, task)
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def _set_failed_state(self, state):
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if state.run_state == IteratingStates.SETUP:
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state.fail_state |= FailedStates.SETUP
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state.run_state = IteratingStates.COMPLETE
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elif state.run_state == IteratingStates.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 |= FailedStates.TASKS
|
|
if state._blocks[state.cur_block].rescue:
|
|
state.run_state = IteratingStates.RESCUE
|
|
elif state._blocks[state.cur_block].always:
|
|
state.run_state = IteratingStates.ALWAYS
|
|
else:
|
|
state.run_state = IteratingStates.COMPLETE
|
|
elif state.run_state == IteratingStates.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 |= FailedStates.RESCUE
|
|
if state._blocks[state.cur_block].always:
|
|
state.run_state = IteratingStates.ALWAYS
|
|
else:
|
|
state.run_state = IteratingStates.COMPLETE
|
|
elif state.run_state == IteratingStates.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 |= FailedStates.ALWAYS
|
|
state.run_state = IteratingStates.COMPLETE
|
|
return state
|
|
|
|
def mark_host_failed(self, host):
|
|
s = self.get_host_state(host)
|
|
display.debug("marking host %s failed, current state: %s" % (host, s))
|
|
if s.run_state == IteratingStates.HANDLERS:
|
|
# we are failing `meta: flush_handlers`, so just reset the state to whatever
|
|
# it was before and let `_set_failed_state` figure out the next state
|
|
s.run_state = s.pre_flushing_run_state
|
|
s.update_handlers = True
|
|
s = self._set_failed_state(s)
|
|
display.debug("^ failed state is now: %s" % s)
|
|
self.set_state_for_host(host.name, s)
|
|
self._play._removed_hosts.append(host.name)
|
|
|
|
def get_failed_hosts(self):
|
|
return dict((host, True) for (host, state) in self._host_states.items() if self._check_failed_state(state))
|
|
|
|
def _check_failed_state(self, state):
|
|
if state is None:
|
|
return False
|
|
elif state.run_state == IteratingStates.RESCUE and self._check_failed_state(state.rescue_child_state):
|
|
return True
|
|
elif state.run_state == IteratingStates.ALWAYS and self._check_failed_state(state.always_child_state):
|
|
return True
|
|
elif state.fail_state != FailedStates.NONE:
|
|
if state.run_state == IteratingStates.RESCUE and state.fail_state & FailedStates.RESCUE == 0:
|
|
return False
|
|
elif state.run_state == IteratingStates.ALWAYS and state.fail_state & FailedStates.ALWAYS == 0:
|
|
return False
|
|
else:
|
|
return not (state.did_rescue and state.fail_state & FailedStates.ALWAYS == 0)
|
|
elif state.run_state == IteratingStates.TASKS and self._check_failed_state(state.tasks_child_state):
|
|
cur_block = state._blocks[state.cur_block]
|
|
if len(cur_block.rescue) > 0 and state.fail_state & FailedStates.RESCUE == 0:
|
|
return False
|
|
else:
|
|
return True
|
|
return False
|
|
|
|
def is_failed(self, host):
|
|
s = self.get_host_state(host)
|
|
return self._check_failed_state(s)
|
|
|
|
def clear_host_errors(self, host):
|
|
self._clear_state_errors(self.get_state_for_host(host.name))
|
|
|
|
def _clear_state_errors(self, state: HostState) -> None:
|
|
state.fail_state = FailedStates.NONE
|
|
|
|
if state.tasks_child_state is not None:
|
|
self._clear_state_errors(state.tasks_child_state)
|
|
elif state.rescue_child_state is not None:
|
|
self._clear_state_errors(state.rescue_child_state)
|
|
elif state.always_child_state is not None:
|
|
self._clear_state_errors(state.always_child_state)
|
|
|
|
def get_active_state(self, state):
|
|
'''
|
|
Finds the active state, recursively if necessary when there are child states.
|
|
'''
|
|
if state.run_state == IteratingStates.TASKS and state.tasks_child_state is not None:
|
|
return self.get_active_state(state.tasks_child_state)
|
|
elif state.run_state == IteratingStates.RESCUE and state.rescue_child_state is not None:
|
|
return self.get_active_state(state.rescue_child_state)
|
|
elif state.run_state == IteratingStates.ALWAYS and state.always_child_state is not None:
|
|
return self.get_active_state(state.always_child_state)
|
|
return state
|
|
|
|
def is_any_block_rescuing(self, state):
|
|
'''
|
|
Given the current HostState state, determines if the current block, or any child blocks,
|
|
are in rescue mode.
|
|
'''
|
|
if state.run_state == IteratingStates.TASKS and state.get_current_block().rescue:
|
|
return True
|
|
if state.tasks_child_state is not None:
|
|
return self.is_any_block_rescuing(state.tasks_child_state)
|
|
if state.rescue_child_state is not None:
|
|
return self.is_any_block_rescuing(state.rescue_child_state)
|
|
if state.always_child_state is not None:
|
|
return self.is_any_block_rescuing(state.always_child_state)
|
|
return False
|
|
|
|
def _insert_tasks_into_state(self, state, task_list):
|
|
# if we've failed at all, or if the task list is empty, just return the current state
|
|
if (state.fail_state != FailedStates.NONE and state.run_state == IteratingStates.TASKS) or not task_list:
|
|
return state
|
|
|
|
if state.run_state == IteratingStates.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()
|
|
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 == IteratingStates.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()
|
|
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 == IteratingStates.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()
|
|
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
|
|
elif state.run_state == IteratingStates.HANDLERS:
|
|
state.handlers[state.cur_handlers_task:state.cur_handlers_task] = [h for b in task_list for h in b.block]
|
|
|
|
return state
|
|
|
|
def add_tasks(self, host, task_list):
|
|
self.set_state_for_host(host.name, self._insert_tasks_into_state(self.get_host_state(host), task_list))
|
|
|
|
@property
|
|
def host_states(self):
|
|
return self._host_states
|
|
|
|
def get_state_for_host(self, hostname: str) -> HostState:
|
|
return self._host_states[hostname]
|
|
|
|
def set_state_for_host(self, hostname: str, state: HostState) -> None:
|
|
if not isinstance(state, HostState):
|
|
raise AnsibleAssertionError('Expected state to be a HostState but was a %s' % type(state))
|
|
self._host_states[hostname] = state
|
|
|
|
def set_run_state_for_host(self, hostname: str, run_state: IteratingStates) -> None:
|
|
if not isinstance(run_state, IteratingStates):
|
|
raise AnsibleAssertionError('Expected run_state to be a IteratingStates but was %s' % (type(run_state)))
|
|
self._host_states[hostname].run_state = run_state
|
|
|
|
def set_fail_state_for_host(self, hostname: str, fail_state: FailedStates) -> None:
|
|
if not isinstance(fail_state, FailedStates):
|
|
raise AnsibleAssertionError('Expected fail_state to be a FailedStates but was %s' % (type(fail_state)))
|
|
self._host_states[hostname].fail_state = fail_state
|
|
|
|
def add_notification(self, hostname: str, notification: str) -> None:
|
|
# preserve order
|
|
host_state = self._host_states[hostname]
|
|
if notification not in host_state.handler_notifications:
|
|
host_state.handler_notifications.append(notification)
|
|
|
|
def clear_notification(self, hostname: str, notification: str) -> None:
|
|
self._host_states[hostname].handler_notifications.remove(notification)
|