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Diffstat (limited to 'lib/ansible/plugins/strategy/linear.py')
| -rw-r--r-- | lib/ansible/plugins/strategy/linear.py | 406 |
1 files changed, 406 insertions, 0 deletions
diff --git a/lib/ansible/plugins/strategy/linear.py b/lib/ansible/plugins/strategy/linear.py new file mode 100644 index 0000000..a3c91c2 --- /dev/null +++ b/lib/ansible/plugins/strategy/linear.py @@ -0,0 +1,406 @@ +# (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 + +DOCUMENTATION = ''' + name: linear + short_description: Executes tasks in a linear fashion + description: + - Task execution is in lockstep per host batch as defined by C(serial) (default all). + Up to the fork limit of hosts will execute each task at the same time and then + the next series of hosts until the batch is done, before going on to the next task. + version_added: "2.0" + notes: + - This was the default Ansible behaviour before 'strategy plugins' were introduced in 2.0. + author: Ansible Core Team +''' + +from ansible import constants as C +from ansible.errors import AnsibleError, AnsibleAssertionError, AnsibleParserError +from ansible.executor.play_iterator import IteratingStates, FailedStates +from ansible.module_utils._text import to_text +from ansible.playbook.handler import Handler +from ansible.playbook.included_file import IncludedFile +from ansible.playbook.task import Task +from ansible.plugins.loader import action_loader +from ansible.plugins.strategy import StrategyBase +from ansible.template import Templar +from ansible.utils.display import Display + +display = Display() + + +class StrategyModule(StrategyBase): + + def __init__(self, *args, **kwargs): + super().__init__(*args, **kwargs) + + # used for the lockstep to indicate to run handlers + self._in_handlers = False + + def _get_next_task_lockstep(self, hosts, iterator): + ''' + Returns a list of (host, task) tuples, where the task may + be a noop task to keep the iterator in lock step across + all hosts. + ''' + noop_task = Task() + noop_task.action = 'meta' + noop_task.args['_raw_params'] = 'noop' + noop_task.implicit = True + noop_task.set_loader(iterator._play._loader) + + state_task_per_host = {} + for host in hosts: + state, task = iterator.get_next_task_for_host(host, peek=True) + if task is not None: + state_task_per_host[host] = state, task + + if not state_task_per_host: + return [(h, None) for h in hosts] + + if self._in_handlers and not any(filter( + lambda rs: rs == IteratingStates.HANDLERS, + (s.run_state for s, _ in state_task_per_host.values())) + ): + self._in_handlers = False + + if self._in_handlers: + lowest_cur_handler = min( + s.cur_handlers_task for s, t in state_task_per_host.values() + if s.run_state == IteratingStates.HANDLERS + ) + else: + task_uuids = [t._uuid for s, t in state_task_per_host.values()] + _loop_cnt = 0 + while _loop_cnt <= 1: + try: + cur_task = iterator.all_tasks[iterator.cur_task] + except IndexError: + # pick up any tasks left after clear_host_errors + iterator.cur_task = 0 + _loop_cnt += 1 + else: + iterator.cur_task += 1 + if cur_task._uuid in task_uuids: + break + else: + # prevent infinite loop + raise AnsibleAssertionError( + 'BUG: There seems to be a mismatch between tasks in PlayIterator and HostStates.' + ) + + host_tasks = [] + for host, (state, task) in state_task_per_host.items(): + if ((self._in_handlers and lowest_cur_handler == state.cur_handlers_task) or + (not self._in_handlers and cur_task._uuid == task._uuid)): + iterator.set_state_for_host(host.name, state) + host_tasks.append((host, task)) + else: + host_tasks.append((host, noop_task)) + + # once hosts synchronize on 'flush_handlers' lockstep enters + # '_in_handlers' phase where handlers are run instead of tasks + # until at least one host is in IteratingStates.HANDLERS + if (not self._in_handlers and cur_task.action in C._ACTION_META and + cur_task.args.get('_raw_params') == 'flush_handlers'): + self._in_handlers = True + + return host_tasks + + def run(self, iterator, play_context): + ''' + The linear strategy is simple - get the next task and queue + it for all hosts, then wait for the queue to drain before + moving on to the next task + ''' + + # iterate over each task, while there is one left to run + result = self._tqm.RUN_OK + work_to_do = True + + self._set_hosts_cache(iterator._play) + + while work_to_do and not self._tqm._terminated: + + try: + display.debug("getting the remaining hosts for this loop") + hosts_left = self.get_hosts_left(iterator) + display.debug("done getting the remaining hosts for this loop") + + # queue up this task for each host in the inventory + callback_sent = False + work_to_do = False + + host_tasks = self._get_next_task_lockstep(hosts_left, iterator) + + # skip control + skip_rest = False + choose_step = True + + # flag set if task is set to any_errors_fatal + any_errors_fatal = False + + results = [] + for (host, task) in host_tasks: + if not task: + continue + + if self._tqm._terminated: + break + + run_once = False + work_to_do = True + + # check to see if this task should be skipped, due to it being a member of a + # role which has already run (and whether that role allows duplicate execution) + if not isinstance(task, Handler) and task._role and task._role.has_run(host): + # If there is no metadata, the default behavior is to not allow duplicates, + # if there is metadata, check to see if the allow_duplicates flag was set to true + if task._role._metadata is None or task._role._metadata and not task._role._metadata.allow_duplicates: + display.debug("'%s' skipped because role has already run" % task) + continue + + display.debug("getting variables") + task_vars = self._variable_manager.get_vars(play=iterator._play, host=host, task=task, + _hosts=self._hosts_cache, _hosts_all=self._hosts_cache_all) + self.add_tqm_variables(task_vars, play=iterator._play) + templar = Templar(loader=self._loader, variables=task_vars) + display.debug("done getting variables") + + # test to see if the task across all hosts points to an action plugin which + # sets BYPASS_HOST_LOOP to true, or if it has run_once enabled. If so, we + # will only send this task to the first host in the list. + + task_action = templar.template(task.action) + + try: + action = action_loader.get(task_action, class_only=True, collection_list=task.collections) + except KeyError: + # we don't care here, because the action may simply not have a + # corresponding action plugin + action = None + + if task_action in C._ACTION_META: + # for the linear strategy, we run meta tasks just once and for + # all hosts currently being iterated over rather than one host + results.extend(self._execute_meta(task, play_context, iterator, host)) + if task.args.get('_raw_params', None) not in ('noop', 'reset_connection', 'end_host', 'role_complete', 'flush_handlers'): + run_once = True + if (task.any_errors_fatal or run_once) and not task.ignore_errors: + any_errors_fatal = True + else: + # handle step if needed, skip meta actions as they are used internally + if self._step and choose_step: + if self._take_step(task): + choose_step = False + else: + skip_rest = True + break + + run_once = templar.template(task.run_once) or action and getattr(action, 'BYPASS_HOST_LOOP', False) + + if (task.any_errors_fatal or run_once) and not task.ignore_errors: + any_errors_fatal = True + + if not callback_sent: + display.debug("sending task start callback, copying the task so we can template it temporarily") + saved_name = task.name + display.debug("done copying, going to template now") + try: + task.name = to_text(templar.template(task.name, fail_on_undefined=False), nonstring='empty') + display.debug("done templating") + except Exception: + # just ignore any errors during task name templating, + # we don't care if it just shows the raw name + display.debug("templating failed for some reason") + display.debug("here goes the callback...") + if isinstance(task, Handler): + self._tqm.send_callback('v2_playbook_on_handler_task_start', task) + else: + self._tqm.send_callback('v2_playbook_on_task_start', task, is_conditional=False) + task.name = saved_name + callback_sent = True + display.debug("sending task start callback") + + self._blocked_hosts[host.get_name()] = True + self._queue_task(host, task, task_vars, play_context) + del task_vars + + # if we're bypassing the host loop, break out now + if run_once: + break + + results.extend(self._process_pending_results(iterator, max_passes=max(1, int(len(self._tqm._workers) * 0.1)))) + + # go to next host/task group + if skip_rest: + continue + + display.debug("done queuing things up, now waiting for results queue to drain") + if self._pending_results > 0: + results.extend(self._wait_on_pending_results(iterator)) + + self.update_active_connections(results) + + included_files = IncludedFile.process_include_results( + results, + iterator=iterator, + loader=self._loader, + variable_manager=self._variable_manager + ) + + if len(included_files) > 0: + display.debug("we have included files to process") + + display.debug("generating all_blocks data") + all_blocks = dict((host, []) for host in hosts_left) + display.debug("done generating all_blocks data") + included_tasks = [] + failed_includes_hosts = set() + for included_file in included_files: + display.debug("processing included file: %s" % included_file._filename) + is_handler = False + try: + if included_file._is_role: + new_ir = self._copy_included_file(included_file) + + new_blocks, handler_blocks = new_ir.get_block_list( + play=iterator._play, + variable_manager=self._variable_manager, + loader=self._loader, + ) + else: + is_handler = isinstance(included_file._task, Handler) + new_blocks = self._load_included_file(included_file, iterator=iterator, is_handler=is_handler) + + # let PlayIterator know about any new handlers included via include_role or + # import_role within include_role/include_taks + iterator.handlers = [h for b in iterator._play.handlers for h in b.block] + + display.debug("iterating over new_blocks loaded from include file") + for new_block in new_blocks: + if is_handler: + for task in new_block.block: + task.notified_hosts = included_file._hosts[:] + final_block = new_block + else: + task_vars = self._variable_manager.get_vars( + play=iterator._play, + task=new_block.get_first_parent_include(), + _hosts=self._hosts_cache, + _hosts_all=self._hosts_cache_all, + ) + display.debug("filtering new block on tags") + final_block = new_block.filter_tagged_tasks(task_vars) + display.debug("done filtering new block on tags") + + included_tasks.extend(final_block.get_tasks()) + + for host in hosts_left: + if host in included_file._hosts: + all_blocks[host].append(final_block) + + display.debug("done iterating over new_blocks loaded from include file") + except AnsibleParserError: + raise + except AnsibleError as e: + if included_file._is_role: + # include_role does not have on_include callback so display the error + display.error(to_text(e), wrap_text=False) + for r in included_file._results: + r._result['failed'] = True + failed_includes_hosts.add(r._host) + continue + + for host in failed_includes_hosts: + self._tqm._failed_hosts[host.name] = True + iterator.mark_host_failed(host) + + # finally go through all of the hosts and append the + # accumulated blocks to their list of tasks + display.debug("extending task lists for all hosts with included blocks") + + for host in hosts_left: + iterator.add_tasks(host, all_blocks[host]) + + iterator.all_tasks[iterator.cur_task:iterator.cur_task] = included_tasks + + display.debug("done extending task lists") + display.debug("done processing included files") + + display.debug("results queue empty") + + display.debug("checking for any_errors_fatal") + failed_hosts = [] + unreachable_hosts = [] + for res in results: + # execute_meta() does not set 'failed' in the TaskResult + # so we skip checking it with the meta tasks and look just at the iterator + if (res.is_failed() or res._task.action in C._ACTION_META) and iterator.is_failed(res._host): + failed_hosts.append(res._host.name) + elif res.is_unreachable(): + unreachable_hosts.append(res._host.name) + + # if any_errors_fatal and we had an error, mark all hosts as failed + if any_errors_fatal and (len(failed_hosts) > 0 or len(unreachable_hosts) > 0): + dont_fail_states = frozenset([IteratingStates.RESCUE, IteratingStates.ALWAYS]) + for host in hosts_left: + (s, _) = iterator.get_next_task_for_host(host, peek=True) + # the state may actually be in a child state, use the get_active_state() + # method in the iterator to figure out the true active state + s = iterator.get_active_state(s) + if s.run_state not in dont_fail_states or \ + s.run_state == IteratingStates.RESCUE and s.fail_state & FailedStates.RESCUE != 0: + self._tqm._failed_hosts[host.name] = True + result |= self._tqm.RUN_FAILED_BREAK_PLAY + display.debug("done checking for any_errors_fatal") + + display.debug("checking for max_fail_percentage") + if iterator._play.max_fail_percentage is not None and len(results) > 0: + percentage = iterator._play.max_fail_percentage / 100.0 + + if (len(self._tqm._failed_hosts) / iterator.batch_size) > percentage: + for host in hosts_left: + # don't double-mark hosts, or the iterator will potentially + # fail them out of the rescue/always states + if host.name not in failed_hosts: + self._tqm._failed_hosts[host.name] = True + iterator.mark_host_failed(host) + self._tqm.send_callback('v2_playbook_on_no_hosts_remaining') + result |= self._tqm.RUN_FAILED_BREAK_PLAY + display.debug('(%s failed / %s total )> %s max fail' % (len(self._tqm._failed_hosts), iterator.batch_size, percentage)) + display.debug("done checking for max_fail_percentage") + + display.debug("checking to see if all hosts have failed and the running result is not ok") + if result != self._tqm.RUN_OK and len(self._tqm._failed_hosts) >= len(hosts_left): + display.debug("^ not ok, so returning result now") + self._tqm.send_callback('v2_playbook_on_no_hosts_remaining') + return result + display.debug("done checking to see if all hosts have failed") + + except (IOError, EOFError) as e: + display.debug("got IOError/EOFError in task loop: %s" % e) + # most likely an abort, return failed + return self._tqm.RUN_UNKNOWN_ERROR + + # run the base class run() method, which executes the cleanup function + # and runs any outstanding handlers which have been triggered + + return super(StrategyModule, self).run(iterator, play_context, result) |