Current File : //lib/python2.7/site-packages/ansible/playbook/block.py
# (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.errors import AnsibleParserError
from ansible.playbook.attribute import Attribute, FieldAttribute
from ansible.playbook.base import Base
from ansible.playbook.become import Become
from ansible.playbook.conditional import Conditional
from ansible.playbook.helpers import load_list_of_tasks
from ansible.playbook.role import Role
from ansible.playbook.taggable import Taggable
class Block(Base, Become, Conditional, Taggable):
_block = FieldAttribute(isa='list', default=[], inherit=False)
_rescue = FieldAttribute(isa='list', default=[], inherit=False)
_always = FieldAttribute(isa='list', default=[], inherit=False)
_delegate_to = FieldAttribute(isa='list')
_delegate_facts = FieldAttribute(isa='bool', default=False)
_any_errors_fatal = FieldAttribute(isa='bool')
# for future consideration? this would be functionally
# similar to the 'else' clause for exceptions
#_otherwise = FieldAttribute(isa='list')
def __init__(self, play=None, parent_block=None, role=None, task_include=None, use_handlers=False, implicit=False):
self._play = play
self._role = role
self._parent = None
self._dep_chain = None
self._use_handlers = use_handlers
self._implicit = implicit
if task_include:
self._parent = task_include
elif parent_block:
self._parent = parent_block
super(Block, self).__init__()
def __repr__(self):
return "BLOCK(uuid=%s)(id=%s)(parent=%s)" % (self._uuid, id(self), self._parent)
def get_vars(self):
'''
Blocks do not store variables directly, however they may be a member
of a role or task include which does, so return those if present.
'''
all_vars = self.vars.copy()
if self._parent:
all_vars.update(self._parent.get_vars())
return all_vars
@staticmethod
def load(data, play=None, parent_block=None, role=None, task_include=None, use_handlers=False, variable_manager=None, loader=None):
implicit = not Block.is_block(data)
b = Block(play=play, parent_block=parent_block, role=role, task_include=task_include, use_handlers=use_handlers, implicit=implicit)
return b.load_data(data, variable_manager=variable_manager, loader=loader)
@staticmethod
def is_block(ds):
is_block = False
if isinstance(ds, dict):
for attr in ('block', 'rescue', 'always'):
if attr in ds:
is_block = True
break
return is_block
def preprocess_data(self, ds):
'''
If a simple task is given, an implicit block for that single task
is created, which goes in the main portion of the block
'''
if not Block.is_block(ds):
if isinstance(ds, list):
return super(Block, self).preprocess_data(dict(block=ds))
else:
return super(Block, self).preprocess_data(dict(block=[ds]))
return super(Block, self).preprocess_data(ds)
def _load_block(self, attr, ds):
try:
return load_list_of_tasks(
ds,
play=self._play,
block=self,
role=self._role,
task_include=None,
variable_manager=self._variable_manager,
loader=self._loader,
use_handlers=self._use_handlers,
)
except AssertionError:
raise AnsibleParserError("A malformed block was encountered.", obj=self._ds)
def _load_rescue(self, attr, ds):
try:
return load_list_of_tasks(
ds,
play=self._play,
block=self,
role=self._role,
task_include=None,
variable_manager=self._variable_manager,
loader=self._loader,
use_handlers=self._use_handlers,
)
except AssertionError:
raise AnsibleParserError("A malformed block was encountered.", obj=self._ds)
def _load_always(self, attr, ds):
try:
return load_list_of_tasks(
ds,
play=self._play,
block=self,
role=self._role,
task_include=None,
variable_manager=self._variable_manager,
loader=self._loader,
use_handlers=self._use_handlers,
)
except AssertionError:
raise AnsibleParserError("A malformed block was encountered.", obj=self._ds)
def get_dep_chain(self):
if self._dep_chain is None:
if self._parent:
return self._parent.get_dep_chain()
else:
return None
else:
return self._dep_chain[:]
def copy(self, exclude_parent=False, exclude_tasks=False):
def _dupe_task_list(task_list, new_block):
new_task_list = []
for task in task_list:
new_task = task.copy(exclude_parent=True)
if task._parent:
new_task._parent = task._parent.copy(exclude_tasks=True)
# go up the parentage tree until we find an
# object without a parent and make this new
# block their parent
cur_obj = new_task
while cur_obj._parent:
cur_obj = cur_obj._parent
cur_obj._parent = new_block
else:
new_task._parent = new_block
new_task_list.append(new_task)
return new_task_list
new_me = super(Block, self).copy()
new_me._play = self._play
new_me._use_handlers = self._use_handlers
if self._dep_chain is not None:
new_me._dep_chain = self._dep_chain[:]
new_me._parent = None
if self._parent and not exclude_parent:
new_me._parent = self._parent.copy(exclude_tasks=exclude_tasks)
if not exclude_tasks:
new_me.block = _dupe_task_list(self.block or [], new_me)
new_me.rescue = _dupe_task_list(self.rescue or [], new_me)
new_me.always = _dupe_task_list(self.always or [], new_me)
new_me._role = None
if self._role:
new_me._role = self._role
new_me.validate()
return new_me
def serialize(self):
'''
Override of the default serialize method, since when we're serializing
a task we don't want to include the attribute list of tasks.
'''
data = dict()
for attr in self._valid_attrs:
if attr not in ('block', 'rescue', 'always'):
data[attr] = getattr(self, attr)
data['dep_chain'] = self.get_dep_chain()
if self._role is not None:
data['role'] = self._role.serialize()
if self._parent is not None:
data['parent'] = self._parent.copy(exclude_tasks=True).serialize()
data['parent_type'] = self._parent.__class__.__name__
return data
def deserialize(self, data):
'''
Override of the default deserialize method, to match the above overridden
serialize method
'''
# import is here to avoid import loops
from ansible.playbook.task import Task
from ansible.playbook.task_include import TaskInclude
from ansible.playbook.handler_task_include import HandlerTaskInclude
# we don't want the full set of attributes (the task lists), as that
# would lead to a serialize/deserialize loop
for attr in self._valid_attrs:
if attr in data and attr not in ('block', 'rescue', 'always'):
setattr(self, attr, data.get(attr))
self._dep_chain = data.get('dep_chain', None)
# if there was a serialized role, unpack it too
role_data = data.get('role')
if role_data:
r = Role()
r.deserialize(role_data)
self._role = r
parent_data = data.get('parent')
if parent_data:
parent_type = data.get('parent_type')
if parent_type == 'Block':
p = Block()
elif parent_type == 'TaskInclude':
p = TaskInclude()
elif parent_type == 'HandlerTaskInclude':
p = HandlerTaskInclude()
p.deserialize(pb_data)
self._parent = p
self._dep_chain = self._parent.get_dep_chain()
def set_loader(self, loader):
self._loader = loader
if self._parent:
self._parent.set_loader(loader)
elif self._role:
self._role.set_loader(loader)
dep_chain = self.get_dep_chain()
if dep_chain:
for dep in dep_chain:
dep.set_loader(loader)
def _get_attr_environment(self):
return self._get_parent_attribute('environment', extend=True)
def _get_parent_attribute(self, attr, extend=False, prepend=False):
'''
Generic logic to get the attribute or parent attribute for a block value.
'''
value = None
try:
value = self._attributes[attr]
if self._parent and (value is None or extend):
try:
parent_value = getattr(self._parent, attr, None)
if extend:
value = self._extend_value(value, parent_value, prepend)
else:
value = parent_value
except AttributeError:
pass
if self._role and (value is None or extend):
try:
parent_value = getattr(self._role, attr, None)
if extend:
value = self._extend_value(value, parent_value, prepend)
else:
value = parent_value
dep_chain = self.get_dep_chain()
if dep_chain and (value is None or extend):
dep_chain.reverse()
for dep in dep_chain:
dep_value = getattr(dep, attr, None)
if extend:
value = self._extend_value(value, dep_value, prepend)
else:
value = dep_value
if value is not None and not extend:
break
except AttributeError:
pass
if self._play and (value is None or extend):
try:
parent_value = getattr(self._play, attr, None)
if extend:
value = self._extend_value(value, parent_value, prepend)
else:
value = parent_value
except AttributeError:
pass
except KeyError as e:
pass
return value
def filter_tagged_tasks(self, play_context, all_vars):
'''
Creates a new block, with task lists filtered based on the tags contained
within the play_context object.
'''
def evaluate_and_append_task(target):
tmp_list = []
for task in target:
if isinstance(task, Block):
tmp_list.append(evaluate_block(task))
elif task.action == 'meta' \
or (task.action == 'include' and task.evaluate_tags([], play_context.skip_tags, all_vars=all_vars)) \
or task.evaluate_tags(play_context.only_tags, play_context.skip_tags, all_vars=all_vars):
tmp_list.append(task)
return tmp_list
def evaluate_block(block):
new_block = self.copy(exclude_tasks=True)
new_block.block = evaluate_and_append_task(block.block)
new_block.rescue = evaluate_and_append_task(block.rescue)
new_block.always = evaluate_and_append_task(block.always)
return new_block
return evaluate_block(self)
def has_tasks(self):
return len(self.block) > 0 or len(self.rescue) > 0 or len(self.always) > 0
def get_include_params(self):
if self._parent:
return self._parent.get_include_params()
else:
return dict()
def all_parents_static(self):
'''
Determine if all of the parents of this block were statically loaded
or not. Since Task/TaskInclude objects may be in the chain, they simply
call their parents all_parents_static() method. Only Block objects in
the chain check the statically_loaded value of the parent.
'''
from ansible.playbook.task_include import TaskInclude
if self._parent:
if isinstance(self._parent, TaskInclude) and not self._parent.statically_loaded:
return False
return self._parent.all_parents_static()
return True
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