# (c) 2012-2014, Michael DeHaan # # 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 . # Make coding more python3-ish from __future__ import (absolute_import, division, print_function) __metaclass__ = type import time from ansible.plugins.strategies import StrategyBase from ansible.utils.debug import debug class StrategyModule(StrategyBase): def run(self, iterator, connection_info): ''' The "free" strategy is a bit more complex, in that it allows tasks to be sent to hosts as quickly as they can be processed. This means that some hosts may finish very quickly if run tasks result in little or no work being done versus other systems. The algorithm used here also tries to be more "fair" when iterating through hosts by remembering the last host in the list to be given a task and starting the search from there as opposed to the top of the hosts list again, which would end up favoring hosts near the beginning of the list. ''' # the last host to be given a task last_host = 0 result = True work_to_do = True while work_to_do and not self._tqm._terminated: hosts_left = self.get_hosts_remaining(iterator._play) if len(hosts_left) == 0: self._tqm.send_callback('v2_playbook_on_no_hosts_remaining') result = False break work_to_do = False # assume we have no more work to do starting_host = last_host # save current position so we know when we've # looped back around and need to break # try and find an unblocked host with a task to run host_results = [] while True: host = hosts_left[last_host] debug("next free host: %s" % host) host_name = host.get_name() # peek at the next task for the host, to see if there's # anything to do do for this host (state, task) = iterator.get_next_task_for_host(host, peek=True) debug("free host state: %s" % state) debug("free host task: %s" % task) if host_name not in self._tqm._failed_hosts and host_name not in self._tqm._unreachable_hosts and task: # set the flag so the outer loop knows we've still found # some work which needs to be done work_to_do = True debug("this host has work to do") # check to see if this host is blocked (still executing a previous task) if not host_name in self._blocked_hosts: # pop the task, mark the host blocked, and queue it self._blocked_hosts[host_name] = True (state, task) = iterator.get_next_task_for_host(host) debug("getting variables") task_vars = self._variable_manager.get_vars(loader=self._loader, play=iterator._play, host=host, task=task) debug("done getting variables") # 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 task._role and task._role.has_run(): # 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: debug("'%s' skipped because role has already run" % task) continue if not task.evaluate_tags(connection_info.only_tags, connection_info.skip_tags, task_vars) and task.action != 'setup': debug("'%s' failed tag evaluation" % task) continue if task.action == 'meta': # meta tasks store their args in the _raw_params field of args, # since they do not use k=v pairs, so get that meta_action = task.args.get('_raw_params') if meta_action == 'noop': # FIXME: issue a callback for the noop here? continue elif meta_action == 'flush_handlers': # FIXME: in the 'free' mode, flushing handlers should result in # only those handlers notified for the host doing the flush self.run_handlers(iterator, connection_info) else: raise AnsibleError("invalid meta action requested: %s" % meta_action, obj=task._ds) self._blocked_hosts[host_name] = False else: self._tqm.send_callback('v2_playbook_on_task_start', task, is_conditional=False) self._queue_task(host, task, task_vars, connection_info) # move on to the next host and make sure we # haven't gone past the end of our hosts list last_host += 1 if last_host > len(hosts_left) - 1: last_host = 0 # if we've looped around back to the start, break out if last_host == starting_host: break results = self._process_pending_results(iterator) host_results.extend(results) # pause briefly so we don't spin lock time.sleep(0.05) try: results = self._wait_on_pending_results(iterator) host_results.extend(results) except Exception as e: # FIXME: ctrl+c can cause some failures here, so catch them # with the appropriate error type print("wtf: %s" % e) pass # run the base class run() method, which executes the cleanup function # and runs any outstanding handlers which have been triggered super(StrategyModule, self).run(iterator, connection_info)