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|
# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
from ansible.compat.six.moves import queue as Queue
from ansible.compat.six import iteritems, text_type
import time
from jinja2.exceptions import UndefinedError
from ansible import constants as C
from ansible.errors import AnsibleError, AnsibleParserError, AnsibleUndefinedVariable
from ansible.executor.task_result import TaskResult
from ansible.inventory.host import Host
from ansible.inventory.group import Group
from ansible.playbook.handler import Handler
from ansible.playbook.helpers import load_list_of_blocks
from ansible.playbook.included_file import IncludedFile
from ansible.playbook.role import hash_params
from ansible.plugins import action_loader, connection_loader, filter_loader, lookup_loader, module_loader, test_loader
from ansible.template import Templar
from ansible.vars.unsafe_proxy import wrap_var
try:
from __main__ import display
except ImportError:
from ansible.utils.display import Display
display = Display()
__all__ = ['StrategyBase']
# FIXME: this should probably be in the plugins/__init__.py, with
# a smarter mechanism to set all of the attributes based on
# the loaders created there
class SharedPluginLoaderObj:
'''
A simple object to make pass the various plugin loaders to
the forked processes over the queue easier
'''
def __init__(self):
self.action_loader = action_loader
self.connection_loader = connection_loader
self.filter_loader = filter_loader
self.test_loader = test_loader
self.lookup_loader = lookup_loader
self.module_loader = module_loader
class StrategyBase:
'''
This is the base class for strategy plugins, which contains some common
code useful to all strategies like running handlers, cleanup actions, etc.
'''
def __init__(self, tqm):
self._tqm = tqm
self._inventory = tqm.get_inventory()
self._workers = tqm.get_workers()
self._notified_handlers = tqm.get_notified_handlers()
self._variable_manager = tqm.get_variable_manager()
self._loader = tqm.get_loader()
self._final_q = tqm._final_q
self._step = getattr(tqm._options, 'step', False)
self._diff = getattr(tqm._options, 'diff', False)
self._display = display
# internal counters
self._pending_results = 0
self._cur_worker = 0
# this dictionary is used to keep track of hosts that have
# outstanding tasks still in queue
self._blocked_hosts = dict()
def run(self, iterator, play_context, result=True):
# save the failed/unreachable hosts, as the run_handlers()
# method will clear that information during its execution
failed_hosts = self._tqm._failed_hosts.keys()
unreachable_hosts = self._tqm._unreachable_hosts.keys()
self._display.debug("running handlers")
result &= self.run_handlers(iterator, play_context)
# now update with the hosts (if any) that failed or were
# unreachable during the handler execution phase
failed_hosts = set(failed_hosts).union(self._tqm._failed_hosts.keys())
unreachable_hosts = set(unreachable_hosts).union(self._tqm._unreachable_hosts.keys())
# send the stats callback
self._tqm.send_callback('v2_playbook_on_stats', self._tqm._stats)
if len(unreachable_hosts) > 0:
return 3
elif len(failed_hosts) > 0:
return 2
elif not result:
return 1
else:
return 0
def get_hosts_remaining(self, play):
return [host for host in self._inventory.get_hosts(play.hosts) if host.name not in self._tqm._failed_hosts and host.name not in self._tqm._unreachable_hosts]
def get_failed_hosts(self, play):
return [host for host in self._inventory.get_hosts(play.hosts) if host.name in self._tqm._failed_hosts]
def add_tqm_variables(self, vars, play):
'''
Base class method to add extra variables/information to the list of task
vars sent through the executor engine regarding the task queue manager state.
'''
new_vars = vars.copy()
new_vars['ansible_current_hosts'] = self.get_hosts_remaining(play)
new_vars['ansible_failed_hosts'] = self.get_failed_hosts(play)
return new_vars
def _queue_task(self, host, task, task_vars, play_context):
''' handles queueing the task up to be sent to a worker '''
self._display.debug("entering _queue_task() for %s/%s" % (host, task))
# and then queue the new task
self._display.debug("%s - putting task (%s) in queue" % (host, task))
try:
self._display.debug("worker is %d (out of %d available)" % (self._cur_worker+1, len(self._workers)))
(worker_prc, main_q, rslt_q) = self._workers[self._cur_worker]
self._cur_worker += 1
if self._cur_worker >= len(self._workers):
self._cur_worker = 0
# create a dummy object with plugin loaders set as an easier
# way to share them with the forked processes
shared_loader_obj = SharedPluginLoaderObj()
main_q.put((host, task, self._loader.get_basedir(), task_vars, play_context, shared_loader_obj), block=False)
self._pending_results += 1
except (EOFError, IOError, AssertionError) as e:
# most likely an abort
self._display.debug("got an error while queuing: %s" % e)
return
self._display.debug("exiting _queue_task() for %s/%s" % (host, task))
def _process_pending_results(self, iterator):
'''
Reads results off the final queue and takes appropriate action
based on the result (executing callbacks, updating state, etc.).
'''
ret_results = []
while not self._final_q.empty() and not self._tqm._terminated:
try:
result = self._final_q.get(block=False)
self._display.debug("got result from result worker: %s" % ([text_type(x) for x in result],))
# all host status messages contain 2 entries: (msg, task_result)
if result[0] in ('host_task_ok', 'host_task_failed', 'host_task_skipped', 'host_unreachable'):
task_result = result[1]
host = task_result._host
task = task_result._task
if result[0] == 'host_task_failed' or task_result.is_failed():
if not task.ignore_errors:
self._display.debug("marking %s as failed" % host.name)
if task.run_once:
# if we're using run_once, we have to fail every host here
[iterator.mark_host_failed(h) for h in self._inventory.get_hosts(iterator._play.hosts) if h.name not in self._tqm._unreachable_hosts]
else:
iterator.mark_host_failed(host)
self._tqm._failed_hosts[host.name] = True
self._tqm._stats.increment('failures', host.name)
else:
self._tqm._stats.increment('ok', host.name)
self._tqm.send_callback('v2_runner_on_failed', task_result, ignore_errors=task.ignore_errors)
elif result[0] == 'host_unreachable':
self._tqm._unreachable_hosts[host.name] = True
self._tqm._stats.increment('dark', host.name)
self._tqm.send_callback('v2_runner_on_unreachable', task_result)
elif result[0] == 'host_task_skipped':
self._tqm._stats.increment('skipped', host.name)
self._tqm.send_callback('v2_runner_on_skipped', task_result)
elif result[0] == 'host_task_ok':
self._tqm._stats.increment('ok', host.name)
if 'changed' in task_result._result and task_result._result['changed']:
self._tqm._stats.increment('changed', host.name)
self._tqm.send_callback('v2_runner_on_ok', task_result)
if self._diff and 'diff' in task_result._result:
self._tqm.send_callback('v2_on_file_diff', task_result)
self._pending_results -= 1
if host.name in self._blocked_hosts:
del self._blocked_hosts[host.name]
# If this is a role task, mark the parent role as being run (if
# the task was ok or failed, but not skipped or unreachable)
if task_result._task._role is not None and result[0] in ('host_task_ok', 'host_task_failed'):
# lookup the role in the ROLE_CACHE to make sure we're dealing
# with the correct object and mark it as executed
for (entry, role_obj) in iteritems(iterator._play.ROLE_CACHE[task_result._task._role._role_name]):
if role_obj._uuid == task_result._task._role._uuid:
role_obj._had_task_run[host.name] = True
ret_results.append(task_result)
elif result[0] == 'add_host':
task_result = result[1]
new_host_info = task_result.get('add_host', dict())
self._add_host(new_host_info)
elif result[0] == 'add_group':
task = result[1]
self._add_group(task, iterator)
elif result[0] == 'notify_handler':
task_result = result[1]
handler_name = result[2]
original_task = iterator.get_original_task(task_result._host, task_result._task)
if handler_name not in self._notified_handlers:
self._notified_handlers[handler_name] = []
if task_result._host not in self._notified_handlers[handler_name]:
self._notified_handlers[handler_name].append(task_result._host)
self._display.vv("NOTIFIED HANDLER %s" % (handler_name,))
elif result[0] == 'register_host_var':
# essentially the same as 'set_host_var' below, however we
# never follow the delegate_to value for registered vars and
# the variable goes in the fact_cache
host = result[1]
var_name = result[2]
var_value = wrap_var(result[3])
self._variable_manager.set_nonpersistent_facts(host, {var_name: var_value})
elif result[0] in ('set_host_var', 'set_host_facts'):
host = result[1]
task = result[2]
item = result[3]
if task.delegate_to is not None:
task_vars = self._variable_manager.get_vars(loader=self._loader, play=iterator._play, host=host, task=task)
task_vars = self.add_tqm_variables(task_vars, play=iterator._play)
if item is not None:
task_vars['item'] = item
templar = Templar(loader=self._loader, variables=task_vars)
host_name = templar.template(task.delegate_to)
target_host = self._inventory.get_host(host_name)
if target_host is None:
target_host = Host(name=host_name)
else:
target_host = host
if result[0] == 'set_host_var':
var_name = result[4]
var_value = result[5]
self._variable_manager.set_host_variable(target_host, var_name, var_value)
elif result[0] == 'set_host_facts':
facts = result[4]
if task.action == 'set_fact':
self._variable_manager.set_nonpersistent_facts(target_host, facts)
else:
self._variable_manager.set_host_facts(target_host, facts)
else:
raise AnsibleError("unknown result message received: %s" % result[0])
except Queue.Empty:
pass
return ret_results
def _wait_on_pending_results(self, iterator):
'''
Wait for the shared counter to drop to zero, using a short sleep
between checks to ensure we don't spin lock
'''
ret_results = []
self._display.debug("waiting for pending results...")
while self._pending_results > 0 and not self._tqm._terminated:
results = self._process_pending_results(iterator)
ret_results.extend(results)
time.sleep(0.01)
self._display.debug("no more pending results, returning what we have")
return ret_results
def _add_host(self, host_info):
'''
Helper function to add a new host to inventory based on a task result.
'''
host_name = host_info.get('host_name')
# Check if host in cache, add if not
if host_name in self._inventory._hosts_cache:
new_host = self._inventory._hosts_cache[host_name]
else:
new_host = Host(name=host_name)
self._inventory._hosts_cache[host_name] = new_host
allgroup = self._inventory.get_group('all')
allgroup.add_host(new_host)
# Set/update the vars for this host
# FIXME: probably should have a set vars method for the host?
new_vars = host_info.get('host_vars', dict())
new_host.vars = self._inventory.get_host_vars(new_host)
new_host.vars.update(new_vars)
new_groups = host_info.get('groups', [])
for group_name in new_groups:
if not self._inventory.get_group(group_name):
new_group = Group(group_name)
self._inventory.add_group(new_group)
new_group.vars = self._inventory.get_group_variables(group_name)
else:
new_group = self._inventory.get_group(group_name)
new_group.add_host(new_host)
# add this host to the group cache
if self._inventory.groups is not None:
if group_name in self._inventory.groups:
if new_host not in self._inventory.get_group(group_name).hosts:
self._inventory.get_group(group_name).hosts.append(new_host.name)
# clear pattern caching completely since it's unpredictable what
# patterns may have referenced the group
# FIXME: is this still required?
self._inventory.clear_pattern_cache()
def _add_group(self, task, iterator):
'''
Helper function to add a group (if it does not exist), and to assign the
specified host to that group.
'''
# the host here is from the executor side, which means it was a
# serialized/cloned copy and we'll need to look up the proper
# host object from the master inventory
groups = {}
changed = False
for host in self._inventory.get_hosts():
original_task = iterator.get_original_task(host, task)
all_vars = self._variable_manager.get_vars(loader=self._loader, play=iterator._play, host=host, task=original_task)
templar = Templar(loader=self._loader, variables=all_vars)
group_name = templar.template(original_task.args.get('key'))
if task.evaluate_conditional(templar=templar, all_vars=all_vars):
if group_name not in groups:
groups[group_name] = []
groups[group_name].append(host)
for group_name, hosts in iteritems(groups):
new_group = self._inventory.get_group(group_name)
if not new_group:
# create the new group and add it to inventory
new_group = Group(name=group_name)
self._inventory.add_group(new_group)
new_group.vars = self._inventory.get_group_vars(new_group)
# and add the group to the proper hierarchy
allgroup = self._inventory.get_group('all')
allgroup.add_child_group(new_group)
changed = True
for host in hosts:
if group_name not in host.get_groups():
new_group.add_host(host)
changed = True
return changed
def _load_included_file(self, included_file, iterator, is_handler=False):
'''
Loads an included YAML file of tasks, applying the optional set of variables.
'''
try:
data = self._loader.load_from_file(included_file._filename)
if data is None:
return []
except AnsibleError as e:
for host in included_file._hosts:
tr = TaskResult(host=host, task=included_file._task, return_data=dict(failed=True, reason=str(e)))
iterator.mark_host_failed(host)
self._tqm._failed_hosts[host.name] = True
self._tqm._stats.increment('failures', host.name)
self._tqm.send_callback('v2_runner_on_failed', tr)
return []
if not isinstance(data, list):
raise AnsibleParserError("included task files must contain a list of tasks", obj=included_file._task._ds)
block_list = load_list_of_blocks(
data,
play=included_file._task._block._play,
parent_block=included_file._task._block,
task_include=included_file._task,
role=included_file._task._role,
use_handlers=is_handler,
loader=self._loader
)
# set the vars for this task from those specified as params to the include
for b in block_list:
# first make a copy of the including task, so that each has a unique copy to modify
# FIXME: not sure if this is the best way to fix this, as we might be losing
# information in the copy. Previously we assigned the include params to
# the block variables directly, which caused other problems, so we may
# need to figure out a third option if this also presents problems.
b._task_include = b._task_include.copy(exclude_block=True)
# then we create a temporary set of vars to ensure the variable reference is unique
temp_vars = b._task_include.vars.copy()
temp_vars.update(included_file._args.copy())
b._task_include.vars = temp_vars
return block_list
def run_handlers(self, iterator, play_context):
'''
Runs handlers on those hosts which have been notified.
'''
result = True
for handler_block in iterator._play.handlers:
# FIXME: handlers need to support the rescue/always portions of blocks too,
# but this may take some work in the iterator and gets tricky when
# we consider the ability of meta tasks to flush handlers
for handler in handler_block.block:
handler_vars = self._variable_manager.get_vars(loader=self._loader, play=iterator._play, task=handler)
templar = Templar(loader=self._loader, variables=handler_vars)
try:
# first we check with the full result of get_name(), which may
# include the role name (if the handler is from a role). If that
# is not found, we resort to the simple name field, which doesn't
# have anything extra added to it.
handler_name = templar.template(handler.name)
if handler_name not in self._notified_handlers:
handler_name = templar.template(handler.get_name())
except (UndefinedError, AnsibleUndefinedVariable):
# We skip this handler due to the fact that it may be using
# a variable in the name that was conditionally included via
# set_fact or some other method, and we don't want to error
# out unnecessarily
continue
if handler_name in self._notified_handlers and len(self._notified_handlers[handler_name]):
result = self._do_handler_run(handler, handler_name, iterator=iterator, play_context=play_context)
if not result:
break
return result
def _do_handler_run(self, handler, handler_name, iterator, play_context, notified_hosts=None):
# FIXME: need to use iterator.get_failed_hosts() instead?
#if not len(self.get_hosts_remaining(iterator._play)):
# self._tqm.send_callback('v2_playbook_on_no_hosts_remaining')
# result = False
# break
self._tqm.send_callback('v2_playbook_on_handler_task_start', handler)
if notified_hosts is None:
notified_hosts = self._notified_handlers[handler_name]
host_results = []
for host in notified_hosts:
if not handler.has_triggered(host) and (host.name not in self._tqm._failed_hosts or play_context.force_handlers):
task_vars = self._variable_manager.get_vars(loader=self._loader, play=iterator._play, host=host, task=handler)
task_vars = self.add_tqm_variables(task_vars, play=iterator._play)
self._queue_task(host, handler, task_vars, play_context)
# collect the results from the handler run
host_results = self._wait_on_pending_results(iterator)
try:
included_files = IncludedFile.process_include_results(
host_results,
self._tqm,
iterator=iterator,
loader=self._loader,
variable_manager=self._variable_manager
)
except AnsibleError as e:
return False
result = True
if len(included_files) > 0:
for included_file in included_files:
try:
new_blocks = self._load_included_file(included_file, iterator=iterator, is_handler=True)
# for every task in each block brought in by the include, add the list
# of hosts which included the file to the notified_handlers dict
for block in new_blocks:
iterator._play.handlers.append(block)
for task in block.block:
result = self._do_handler_run(
handler=task,
iterator=iterator,
play_context=play_context,
notified_hosts=included_file._hosts[:],
)
if not result:
break
except AnsibleError as e:
for host in included_file._hosts:
iterator.mark_host_failed(host)
self._tqm._failed_hosts[host.name] = True
self._display.warning(str(e))
continue
# wipe the notification list
self._notified_handlers[handler_name] = []
self._display.debug("done running handlers, result is: %s" % result)
return result
def _take_step(self, task, host=None):
ret=False
if host:
msg = u'Perform task: %s on %s (y/n/c): ' % (task, host)
else:
msg = u'Perform task: %s (y/n/c): ' % task
resp = self._display.prompt(msg)
if resp.lower() in ['y','yes']:
self._display.debug("User ran task")
ret = True
elif resp.lower() in ['c', 'continue']:
self._display.debug("User ran task and cancled step mode")
self._step = False
ret = True
else:
self._display.debug("User skipped task")
self._display.banner(msg)
return ret
def _execute_meta(self, task, play_context, iterator):
# meta tasks store their args in the _raw_params field of args,
# since they do not use k=v pairs, so get that
meta_action = task.args.get('_raw_params')
if meta_action == 'noop':
# FIXME: issue a callback for the noop here?
pass
elif meta_action == 'flush_handlers':
self.run_handlers(iterator, play_context)
elif meta_action == 'refresh_inventory':
self._inventory.refresh_inventory()
#elif meta_action == 'reset_connection':
# connection_info.connection.close()
else:
raise AnsibleError("invalid meta action requested: %s" % meta_action, obj=task._ds)
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