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e38ae18627
A play without vars section would fail to use variables given in an include. They would be added to the dict returned by play.get, but the dict would not be added to the play.
532 lines
21 KiB
Python
Executable file
532 lines
21 KiB
Python
Executable file
# (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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remote_port = C.DEFAULT_REMOTE_PORT,
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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.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.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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inject_vars = self._get_vars(play, dirname)
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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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inject_vars[k] = v
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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_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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play['tasks'] = new_tasks
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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, remote_user,
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async_seconds, async_poll_interval, only_if, sudo):
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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,
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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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)
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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):
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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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# 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, remote_user, async_seconds,
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async_poll_interval, only_if, sudo)
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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, 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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# first run the setup task on every node, which gets the variables
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# written to the JSON file and will also bubble facts back up via
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# magic in Runner()
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push_var_str=''
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for (k,v) in vars.iteritems():
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push_var_str += "%s=\"%s\" " % (k,v)
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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=push_var_str, 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,
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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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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:
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SETUP_CACHE[h] = extra_vars
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return host_list
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# *****************************************************
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def _run_play(self, pg):
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''' run a list of tasks for a given pattern, in order '''
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# get configuration information about the pattern
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pattern = pg.get('hosts',None)
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if self.override_hosts:
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pattern = 'all'
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if pattern is None:
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raise errors.AnsibleError('hosts declaration is required')
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vars = self._get_vars(pg, self.basedir)
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vars_files = pg.get('vars_files', {})
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tasks = pg.get('tasks', [])
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handlers = pg.get('handlers', [])
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user = pg.get('user', self.remote_user)
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port = pg.get('port', self.remote_port)
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sudo = pg.get('sudo', False)
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self.callbacks.on_play_start(pattern)
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# push any variables down to the system # and get facts/ohai/other data back up
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self._do_setup_step(pattern, vars, user, port, sudo, None)
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# now with that data, handle contentional variable file imports!
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if len(vars_files) > 0:
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self._do_setup_step(pattern, vars, user, port, sudo, 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
|
|
)
|
|
|
|
# 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
|
|
)
|
|
|
|
# end of execution for this particular pattern. Multiple patterns
|
|
# can be in a single playbook file
|
|
|
|
|
|
|