111 lines
4.8 KiB
Python
111 lines
4.8 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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# Make coding more python3-ish
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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import time
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from ansible.plugins.strategies import StrategyBase
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class StrategyModule(StrategyBase):
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def run(self, iterator, connection_info):
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'''
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The "free" strategy is a bit more complex, in that it allows tasks to
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be sent to hosts as quickly as they can be processed. This means that
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some hosts may finish very quickly if run tasks result in little or no
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work being done versus other systems.
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The algorithm used here also tries to be more "fair" when iterating
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through hosts by remembering the last host in the list to be given a task
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and starting the search from there as opposed to the top of the hosts
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list again, which would end up favoring hosts near the beginning of the
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list.
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'''
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# the last host to be given a task
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last_host = 0
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work_to_do = True
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while work_to_do and not self._tqm._terminated:
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hosts_left = self.get_hosts_remaining()
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if len(hosts_left) == 0:
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self._callback.playbook_on_no_hosts_remaining()
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break
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# using .qsize() is a best estimate anyway, due to the
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# multiprocessing/threading concerns (per the python docs)
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if 1: #if self._job_queue.qsize() < len(hosts_left):
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work_to_do = False # assume we have no more work to do
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starting_host = last_host # save current position so we know when we've
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# looped back around and need to break
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# try and find an unblocked host with a task to run
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while True:
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host = hosts_left[last_host]
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host_name = host.get_name()
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# peek at the next task for the host, to see if there's
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# anything to do do for this host
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if host_name not in self._tqm._failed_hosts and host_name not in self._tqm._unreachable_hosts and iterator.get_next_task_for_host(host, peek=True):
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# FIXME: check task tags, etc. here as we do in linear
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# FIXME: handle meta tasks here, which will require a tweak
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# to run_handlers so that only the handlers on this host
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# are flushed and not all
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# set the flag so the outer loop knows we've still found
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# some work which needs to be done
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work_to_do = True
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# check to see if this host is blocked (still executing a previous task)
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if not host_name in self._blocked_hosts:
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# pop the task, mark the host blocked, and queue it
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self._blocked_hosts[host_name] = True
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task = iterator.get_next_task_for_host(host)
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#self._callback.playbook_on_task_start(task.get_name(), False)
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self._queue_task(iterator._play, host, task, connection_info)
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# move on to the next host and make sure we
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# haven't gone past the end of our hosts list
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last_host += 1
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if last_host > len(hosts_left) - 1:
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last_host = 0
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# if we've looped around back to the start, break out
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if last_host == starting_host:
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break
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# pause briefly so we don't spin lock
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time.sleep(0.05)
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try:
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self._wait_for_pending_results()
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except:
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# FIXME: ctrl+c can cause some failures here, so catch them
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# with the appropriate error type
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pass
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# run the base class run() method, which executes the cleanup function
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# and runs any outstanding handlers which have been triggered
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super(StrategyModule, self).run(iterator, connection_info)
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