126 lines
4.8 KiB
Python
126 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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class PlaybookState:
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'''
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A helper class, which keeps track of the task iteration
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state for a given playbook. This is used in the PlaybookIterator
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class on a per-host basis.
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'''
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def __init__(self, parent_iterator):
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self._parent_iterator = parent_iterator
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self._cur_play = 0
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self._task_list = None
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self._cur_task_pos = 0
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self._done = False
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def next(self, peek=False):
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'''
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Determines and returns the next available task from the playbook,
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advancing through the list of plays as it goes.
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'''
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task = None
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# we save these locally so that we can peek at the next task
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# without updating the internal state of the iterator
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cur_play = self._cur_play
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task_list = self._task_list
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cur_task_pos = self._cur_task_pos
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while True:
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# when we hit the end of the playbook entries list, we set a flag
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# and return None to indicate we're there
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# FIXME: accessing the entries and parent iterator playbook members
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# should be done through accessor functions
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if self._done or cur_play > len(self._parent_iterator._playbook._entries) - 1:
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self._done = True
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return None
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# initialize the task list by calling the .compile() method
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# on the play, which will call compile() for all child objects
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if task_list is None:
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task_list = self._parent_iterator._playbook._entries[cur_play].compile()
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# if we've hit the end of this plays task list, move on to the next
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# and reset the position values for the next iteration
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if cur_task_pos > len(task_list) - 1:
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cur_play += 1
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task_list = None
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cur_task_pos = 0
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continue
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else:
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# FIXME: do tag/conditional evaluation here and advance
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# the task position if it should be skipped without
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# returning a task
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task = task_list[cur_task_pos]
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cur_task_pos += 1
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# Skip the task if it is the member of a role which has already
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# been run, unless the role allows multiple executions
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if task._role:
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# FIXME: this should all be done via member functions
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# instead of direct access to internal variables
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if task._role.has_run() and not task._role._metadata._allow_duplicates:
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continue
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# Break out of the while loop now that we have our task
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break
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# If we're not just peeking at the next task, save the internal state
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if not peek:
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self._cur_play = cur_play
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self._task_list = task_list
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self._cur_task_pos = cur_task_pos
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return task
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class PlaybookIterator:
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'''
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The main iterator class, which keeps the state of the playbook
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on a per-host basis using the above PlaybookState class.
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'''
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def __init__(self, inventory, log_manager, playbook):
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self._playbook = playbook
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self._log_manager = log_manager
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self._host_entries = dict()
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self._first_host = None
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# build the per-host dictionary of playbook states
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for host in inventory.get_hosts():
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if self._first_host is None:
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self._first_host = host
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self._host_entries[host.get_name()] = PlaybookState(parent_iterator=self)
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def get_next_task(self, peek=False):
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''' returns the next task for host[0] '''
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return self._host_entries[self._first_host.get_name()].next(peek=peek)
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def get_next_task_for_host(self, host, peek=False):
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''' fetch the next task for the given host '''
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if host.get_name() not in self._host_entries:
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raise AnsibleError("invalid host specified for playbook iteration")
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return self._host_entries[host.get_name()].next(peek=peek)
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