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566 lines
22 KiB
Python
566 lines
22 KiB
Python
# (c) 2012, 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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#############################################
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import ansible.runner
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import ansible.constants as C
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from ansible import utils
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from ansible import errors
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import shlex
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import os
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import time
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# used to transfer variables to Runner
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SETUP_CACHE={ }
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#############################################
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class PlayBook(object):
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'''
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runs an ansible playbook, given as a datastructure
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or YAML filename. a playbook is a deployment, config
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management, or automation based set of commands to
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run in series.
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multiple plays/tasks do not execute simultaneously,
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but tasks in each pattern do execute in parallel
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(according to the number of forks requested) among
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the hosts they address
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'''
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# *****************************************************
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def __init__(self,
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playbook = None,
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host_list = C.DEFAULT_HOST_LIST,
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module_path = C.DEFAULT_MODULE_PATH,
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forks = C.DEFAULT_FORKS,
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timeout = C.DEFAULT_TIMEOUT,
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remote_user = C.DEFAULT_REMOTE_USER,
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remote_pass = C.DEFAULT_REMOTE_PASS,
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sudo_pass = C.DEFAULT_SUDO_PASS,
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remote_port = C.DEFAULT_REMOTE_PORT,
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transport = C.DEFAULT_TRANSPORT,
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override_hosts = None,
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extra_vars = None,
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debug = False,
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verbose = False,
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callbacks = None,
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runner_callbacks = None,
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stats = None):
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if playbook is None or callbacks is None or runner_callbacks is None or stats is None:
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raise Exception('missing required arguments')
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self.host_list = host_list
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self.module_path = module_path
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self.forks = forks
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self.timeout = timeout
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self.remote_user = remote_user
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self.remote_pass = remote_pass
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self.remote_port = remote_port
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self.transport = transport
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self.debug = debug
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self.verbose = verbose
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self.callbacks = callbacks
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self.runner_callbacks = runner_callbacks
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self.override_hosts = override_hosts
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self.extra_vars = extra_vars
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self.stats = stats
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self.sudo_pass = sudo_pass
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self.basedir = os.path.dirname(playbook)
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self.playbook = self._parse_playbook(playbook)
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self.host_list, self.groups = ansible.runner.Runner.parse_hosts(
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host_list, override_hosts=self.override_hosts, extra_vars=self.extra_vars)
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# *****************************************************
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def _get_vars(self, play, dirname):
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''' load the vars section from a play '''
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if play.get('vars') is None:
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play['vars'] = {}
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vars = play['vars']
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if type(vars) != dict:
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raise errors.AnsibleError("'vars' section must contain only key/value pairs")
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vars_prompt = play.get('vars_prompt', {})
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if type(vars_prompt) != dict:
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raise errors.AnsibleError("'vars_prompt' section must contain only key/value pairs")
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for vname in vars_prompt:
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print vars_prompt[vname]
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# FIXME - need some way to know that this prompt should be getpass or raw_input
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vars[vname] = self.callbacks.on_vars_prompt(vname)
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return vars
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# *****************************************************
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def _include_tasks(self, play, task, dirname, new_tasks):
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''' load tasks included from external files. '''
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# include: some.yml a=2 b=3 c=4
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include_tokens = task['include'].split()
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path = utils.path_dwim(dirname, include_tokens[0])
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play_vars = self._get_vars(play, dirname)
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include_vars = {}
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for i,x in enumerate(include_tokens):
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if x.find("=") != -1:
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(k,v) = x.split("=")
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include_vars[k] = v
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inject_vars = play_vars.copy()
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inject_vars.update(include_vars)
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included = utils.template_from_file(path, inject_vars)
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included = utils.parse_yaml(included)
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for x in included:
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if len(include_vars):
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x["vars"] = include_vars
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new_tasks.append(x)
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# *****************************************************
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def _include_handlers(self, play, handler, dirname, new_handlers):
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''' load handlers from external files '''
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path = utils.path_dwim(dirname, handler['include'])
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inject_vars = self._get_vars(play, dirname)
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included = utils.template_from_file(path, inject_vars)
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included = utils.parse_yaml(included)
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for x in included:
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new_handlers.append(x)
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# *****************************************************
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def _parse_playbook(self, playbook):
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''' load YAML file, including handling for imported files '''
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dirname = os.path.dirname(playbook)
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playbook = utils.parse_yaml_from_file(playbook)
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for play in playbook:
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tasks = play.get('tasks',[])
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handlers = play.get('handlers', [])
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# process tasks in this file as well as imported tasks
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new_tasks = []
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for task in tasks:
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if 'include' in task:
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self._include_tasks(play, task, dirname, new_tasks)
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else:
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new_tasks.append(task)
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# now new_tasks contains a list of tasks, but tasks may contain
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# lists of with_items to loop over. Do that.
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# TODO: refactor into subfunction
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new_tasks2 = []
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for task in new_tasks:
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if 'with_items' in task:
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for item in task['with_items']:
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produced_task = {}
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name = task.get('name', task.get('action', 'unnamed task'))
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action = task.get('action', None)
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only_if = task.get('only_if', None)
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if action is None:
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raise errors.AnsibleError('action is required')
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produced_task = task.copy()
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produced_task['action'] = utils.template(action, dict(item=item))
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produced_task['name'] = utils.template(name, dict(item=item))
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if only_if:
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produced_task['only_if'] = utils.template(only_if, dict(item=item))
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new_tasks2.append(produced_task)
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else:
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new_tasks2.append(task)
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play['tasks'] = new_tasks2
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# process handlers as well as imported handlers
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new_handlers = []
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for handler in handlers:
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if 'include' in handler:
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self._include_handlers(play, handler, dirname, new_handlers)
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else:
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new_handlers.append(handler)
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play['handlers'] = new_handlers
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return playbook
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# *****************************************************
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def run(self):
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''' run all patterns in the playbook '''
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# loop through all patterns and run them
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self.callbacks.on_start()
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for pattern in self.playbook:
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self._run_play(pattern)
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# summarize the results
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results = {}
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for host in self.stats.processed.keys():
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results[host] = self.stats.summarize(host)
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return results
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# *****************************************************
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def hosts_to_poll(self, results):
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''' which hosts need more polling? '''
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hosts = []
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for (host, res) in results['contacted'].iteritems():
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if (host in self.stats.failures) or (host in self.stats.dark):
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continue
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if not 'finished' in res and not 'skipped' in res and 'started' in res:
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hosts.append(host)
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return hosts
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# *****************************************************
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def _async_poll(self, runner, hosts, async_seconds, async_poll_interval, only_if):
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''' launch an async job, if poll_interval is set, wait for completion '''
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runner.host_list = hosts
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runner.background = async_seconds
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results = runner.run()
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self.stats.compute(results, poll=True)
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if async_poll_interval <= 0:
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# if not polling, playbook requested fire and forget
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# trust the user wanted that and return immediately
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return results
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poll_hosts = results['contacted'].keys()
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if len(poll_hosts) == 0:
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# no hosts launched ok, return that.
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return results
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ahost = poll_hosts[0]
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jid = results['contacted'][ahost].get('ansible_job_id', None)
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if jid is None:
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# note: this really shouldn't happen, ever
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self.callbacks.on_async_confused("unexpected error: unable to determine jid")
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return results
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clock = async_seconds
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runner.host_list = self.hosts_to_poll(results)
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poll_results = results
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while (clock >= 0):
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# poll/loop until polling duration complete
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runner.module_args = "jid=%s" % jid
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runner.module_name = 'async_status'
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runner.background = 0
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runner.pattern = '*'
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poll_results = runner.run()
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self.stats.compute(poll_results, poll=True)
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runner.host_list = self.hosts_to_poll(poll_results)
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if len(runner.host_list) == 0:
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break
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if poll_results is None:
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break
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# mention which hosts we're going to poll again...
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for (host, host_result) in poll_results['contacted'].iteritems():
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results['contacted'][host] = host_result
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if not host in self.stats.dark and not host in self.stats.failures:
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self.callbacks.on_async_poll(jid, host, clock, host_result)
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# run down the clock
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clock = clock - async_poll_interval
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time.sleep(async_poll_interval)
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# mark any hosts that are still listed as started as failed
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# since these likely got killed by async_wrapper
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for (host, host_result) in poll_results['contacted'].iteritems():
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if 'started' in host_result:
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reason = { 'failed' : 1, 'rc' : None, 'msg' : 'timed out' }
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self.runner_callbacks.on_failed(host, reason)
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results['contacted'][host] = reason
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return results
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# *****************************************************
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def _run_module(self, pattern, host_list, module, args, vars, remote_user,
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async_seconds, async_poll_interval, only_if, sudo, transport):
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''' run a particular module step in a playbook '''
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hosts = [ h for h in host_list if (h not in self.stats.failures) and (h not in self.stats.dark)]
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runner = ansible.runner.Runner(
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pattern=pattern, groups=self.groups, module_name=module,
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module_args=args, host_list=hosts, forks=self.forks,
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remote_pass=self.remote_pass, module_path=self.module_path,
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timeout=self.timeout, remote_user=remote_user,
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remote_port=self.remote_port, module_vars=vars,
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setup_cache=SETUP_CACHE, basedir=self.basedir,
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conditional=only_if, callbacks=self.runner_callbacks,
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extra_vars=self.extra_vars, debug=self.debug, sudo=sudo,
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transport=transport, sudo_pass=self.sudo_pass
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)
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if async_seconds == 0:
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return runner.run()
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else:
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return self._async_poll(runner, hosts, async_seconds, async_poll_interval, only_if)
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# *****************************************************
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def _run_task(self, pattern=None, host_list=None, task=None,
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remote_user=None, handlers=None, conditional=False, sudo=False, transport=None):
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''' run a single task in the playbook and recursively run any subtasks. '''
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# load the module name and parameters from the task entry
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name = task.get('name', None)
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action = task.get('action', None)
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if action is None:
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raise errors.AnsibleError("action is required for each item in tasks: offending task is %s" % name if name else "unknown")
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if name is None:
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name = action
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only_if = task.get('only_if', 'True')
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async_seconds = int(task.get('async', 0)) # not async by default
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async_poll_interval = int(task.get('poll', 10)) # default poll = 10 seconds
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tokens = action.split(None, 1)
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module_name = tokens[0]
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module_args = tokens[1]
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# include task specific vars
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module_vars = task.get('vars')
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# tasks can be direct (run on all nodes matching
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# the pattern) or conditional, where they ran
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# as the result of a change handler on a subset
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# of all of the hosts
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self.callbacks.on_task_start(name, conditional)
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# load up an appropriate ansible runner to
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# run the task in parallel
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results = self._run_module(pattern, host_list, module_name,
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module_args, module_vars, remote_user, async_seconds,
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async_poll_interval, only_if, sudo, transport)
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self.stats.compute(results)
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# if no hosts are matched, carry on, unlike /bin/ansible
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# which would warn you about this
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if results is None:
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results = {}
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# flag which notify handlers need to be run
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# this will be on a SUBSET of the actual host list. For instance
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# a file might need to be written on only half of the nodes so
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# we would only trigger restarting Apache on half of the nodes
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subtasks = task.get('notify', [])
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if len(subtasks) > 0:
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for host, results in results.get('contacted',{}).iteritems():
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if results.get('changed', False):
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for subtask in subtasks:
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self._flag_handler(handlers, subtask, host)
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# *****************************************************
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def _flag_handler(self, handlers, match_name, host):
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'''
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if a task has any notify elements, flag handlers for run
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at end of execution cycle for hosts that have indicated
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changes have been made
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'''
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# for all registered handlers in the ansible playbook
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# for this particular pattern group
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found = False
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for x in handlers:
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name = x.get('name', None)
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if name is None:
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raise errors.AnsibleError('handler is missing a name')
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if match_name == name:
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found = True
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self.callbacks.on_notify(host, name)
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# flag the handler with the list of hosts it needs to be run on, it will be run later
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if not 'run' in x:
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x['run'] = []
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x['run'].append(host)
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if not found:
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raise errors.AnsibleError("change handler (%s) is not defined" % match_name)
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# *****************************************************
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def _do_conditional_imports(self, vars_files, host_list):
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''' handle the vars_files section, which can contain variables '''
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# FIXME: save parsed variable results in memory to avoid excessive re-reading/parsing
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# FIXME: currently parses imports for hosts not in the pattern, that is not wrong, but it's
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# not super optimized yet either, because we wouldn't have hit them, ergo
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# it will raise false errors if there is no defaults variable file without any $vars
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# in it, which could happen on uncontacted hosts.
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if type(vars_files) != list:
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raise errors.AnsibleError("vars_files must be a list")
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for host in host_list:
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cache_vars = SETUP_CACHE.get(host,{})
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SETUP_CACHE[host] = cache_vars
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for filename in vars_files:
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if type(filename) == list:
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# loop over all filenames, loading the first one, and failing if # none found
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found = False
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sequence = []
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for real_filename in filename:
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filename2 = utils.path_dwim(self.basedir, utils.template(real_filename, cache_vars))
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sequence.append(filename2)
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if os.path.exists(filename2):
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found = True
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data = utils.parse_yaml_from_file(filename2)
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SETUP_CACHE[host].update(data)
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self.callbacks.on_import_for_host(host, filename2)
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break
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else:
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self.callbacks.on_not_import_for_host(host, filename2)
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if not found:
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raise errors.AnsibleError(
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"%s: FATAL, no files matched for vars_files import sequence: %s" % (host, sequence)
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)
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else:
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filename2 = utils.path_dwim(self.basedir, utils.template(filename, cache_vars))
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if not os.path.exists(filename2):
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raise errors.AnsibleError("no file matched for vars_file import: %s" % filename2)
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data = utils.parse_yaml_from_file(filename2)
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SETUP_CACHE[host].update(data)
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self.callbacks.on_import_for_host(host, filename2)
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# *****************************************************
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def _do_setup_step(self, pattern, vars, user, port, sudo, transport, vars_files=None):
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''' push variables down to the systems and get variables+facts back up '''
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# this enables conditional includes like $facter_os.yml and is only done
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# after the original pass when we have that data.
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#
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if vars_files is not None:
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self.callbacks.on_setup_secondary()
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self._do_conditional_imports(vars_files, self.host_list)
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else:
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self.callbacks.on_setup_primary()
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host_list = [ h for h in self.host_list if not (h in self.stats.failures or h in self.stats.dark) ]
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# push any variables down to the system
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setup_results = ansible.runner.Runner(
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pattern=pattern, groups=self.groups, module_name='setup',
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module_args=vars, host_list=host_list,
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forks=self.forks, module_path=self.module_path,
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timeout=self.timeout, remote_user=user,
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remote_pass=self.remote_pass, remote_port=self.remote_port,
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setup_cache=SETUP_CACHE,
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callbacks=self.runner_callbacks, sudo=sudo, debug=self.debug,
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transport=transport, sudo_pass=self.sudo_pass
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).run()
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self.stats.compute(setup_results, setup=True)
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# now for each result, load into the setup cache so we can
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# let runner template out future commands
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setup_ok = setup_results.get('contacted', {})
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if vars_files is None:
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# first pass only or we'll erase good work
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for (host, result) in setup_ok.iteritems():
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SETUP_CACHE[host] = result
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|
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if self.extra_vars:
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extra_vars = utils.parse_kv(self.extra_vars)
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for h in self.host_list:
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try:
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SETUP_CACHE[h].update(extra_vars)
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except:
|
|
SETUP_CACHE[h] = extra_vars
|
|
return host_list
|
|
|
|
# *****************************************************
|
|
|
|
def _run_play(self, pg):
|
|
''' run a list of tasks for a given pattern, in order '''
|
|
|
|
# get configuration information about the pattern
|
|
pattern = pg.get('hosts',None)
|
|
if self.override_hosts:
|
|
pattern = 'all'
|
|
if pattern is None:
|
|
raise errors.AnsibleError('hosts declaration is required')
|
|
|
|
vars = self._get_vars(pg, self.basedir)
|
|
vars_files = pg.get('vars_files', {})
|
|
tasks = pg.get('tasks', [])
|
|
handlers = pg.get('handlers', [])
|
|
user = pg.get('user', self.remote_user)
|
|
port = pg.get('port', self.remote_port)
|
|
sudo = pg.get('sudo', False)
|
|
transport = pg.get('connection', self.transport)
|
|
|
|
self.callbacks.on_play_start(pattern)
|
|
|
|
# push any variables down to the system # and get facts/ohai/other data back up
|
|
self._do_setup_step(pattern, vars, user, port, sudo, transport, None)
|
|
|
|
# now with that data, handle contentional variable file imports!
|
|
if len(vars_files) > 0:
|
|
self._do_setup_step(pattern, vars, user, port, sudo, transport, vars_files)
|
|
|
|
# run all the top level tasks, these get run on every node
|
|
for task in tasks:
|
|
self._run_task(
|
|
pattern=pattern,
|
|
host_list=self.host_list,
|
|
task=task,
|
|
handlers=handlers,
|
|
remote_user=user,
|
|
sudo=sudo,
|
|
transport=transport
|
|
)
|
|
|
|
# handlers only run on certain nodes, they are flagged by _flag_handlers
|
|
# above. They only run on nodes when things mark them as changed, and
|
|
# handlers only get run once. For instance, the system is designed
|
|
# such that multiple config files if changed can ask for an Apache restart
|
|
# but Apache will only be restarted once (at the end).
|
|
|
|
for task in handlers:
|
|
triggered_by = task.get('run', None)
|
|
if type(triggered_by) == list:
|
|
self._run_task(
|
|
pattern=pattern,
|
|
task=task,
|
|
handlers=[],
|
|
host_list=triggered_by,
|
|
conditional=True,
|
|
remote_user=user,
|
|
sudo=sudo,
|
|
transport=transport
|
|
)
|
|
|
|
# end of execution for this particular pattern. Multiple patterns
|
|
# can be in a single playbook file
|
|
|
|
|
|
|