Source code for heat.engine.stack
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import collections
import contextlib
import copy
import eventlet
import functools
import re
import warnings
from oslo_config import cfg
from oslo_log import log as logging
from oslo_utils import excutils
from oslo_utils import timeutils as oslo_timeutils
from oslo_utils import uuidutils
from osprofiler import profiler
import six
from heat.common import context as common_context
from heat.common import environment_format as env_fmt
from heat.common import exception
from heat.common.i18n import _
from heat.common import identifier
from heat.common import lifecycle_plugin_utils
from heat.engine import api
from heat.engine import dependencies
from heat.engine import environment
from heat.engine import event
from heat.engine.notification import stack as notification
from heat.engine import parameter_groups as param_groups
from heat.engine import parent_rsrc
from heat.engine import resource
from heat.engine import resources
from heat.engine import scheduler
from heat.engine import status
from heat.engine import stk_defn
from heat.engine import sync_point
from heat.engine import template as tmpl
from heat.engine import update
from heat.objects import raw_template as raw_template_object
from heat.objects import resource as resource_objects
from heat.objects import snapshot as snapshot_object
from heat.objects import stack as stack_object
from heat.objects import stack_tag as stack_tag_object
from heat.objects import user_creds as ucreds_object
from heat.rpc import api as rpc_api
from heat.rpc import worker_client as rpc_worker_client
LOG = logging.getLogger(__name__)
ConvergenceNode = collections.namedtuple('ConvergenceNode',
['rsrc_id', 'is_update'])
[docs]class ForcedCancel(Exception):
"""Exception raised to cancel task execution."""
def __init__(self, with_rollback=True):
self.with_rollback = with_rollback
def __str__(self):
return "Operation cancelled"
[docs]def reset_state_on_error(func):
@six.wraps(func)
def handle_exceptions(stack, *args, **kwargs):
errmsg = None
try:
return func(stack, *args, **kwargs)
except Exception as exc:
with excutils.save_and_reraise_exception():
errmsg = six.text_type(exc)
LOG.error('Unexpected exception in %(func)s: %(msg)s',
{'func': func.__name__, 'msg': errmsg})
except BaseException as exc:
with excutils.save_and_reraise_exception():
exc_type = type(exc).__name__
errmsg = '%s(%s)' % (exc_type, six.text_type(exc))
LOG.info('Stopped due to %(msg)s in %(func)s',
{'func': func.__name__, 'msg': errmsg})
finally:
if ((not stack.convergence or errmsg is not None) and
stack.status == stack.IN_PROGRESS):
rtnmsg = _("Unexpected exit while IN_PROGRESS.")
stack.mark_failed(errmsg if errmsg is not None else rtnmsg)
assert errmsg is not None, "Returned while IN_PROGRESS."
return handle_exceptions
[docs]@six.python_2_unicode_compatible
class Stack(collections.Mapping):
ACTIONS = (
CREATE, DELETE, UPDATE, ROLLBACK, SUSPEND, RESUME, ADOPT,
SNAPSHOT, CHECK, RESTORE
) = (
'CREATE', 'DELETE', 'UPDATE', 'ROLLBACK', 'SUSPEND', 'RESUME', 'ADOPT',
'SNAPSHOT', 'CHECK', 'RESTORE'
)
STATUSES = (IN_PROGRESS, FAILED, COMPLETE
) = ('IN_PROGRESS', 'FAILED', 'COMPLETE')
_zones = None
def __init__(self, context, stack_name, tmpl,
stack_id=None, action=None, status=None,
status_reason='', timeout_mins=None,
disable_rollback=True, parent_resource=None, owner_id=None,
adopt_stack_data=None, stack_user_project_id=None,
created_time=None, updated_time=None,
user_creds_id=None, tenant_id=None,
use_stored_context=False, username=None,
nested_depth=0, strict_validate=True, convergence=False,
current_traversal=None, tags=None, prev_raw_template_id=None,
current_deps=None, cache_data=None,
deleted_time=None, converge=False):
"""Initialise the Stack.
Initialise from a context, name, Template object and (optionally)
Environment object. The database ID may also be initialised, if the
stack is already in the database.
Creating a stack with cache_data creates a lightweight stack which
will not load any resources from the database and resolve the
functions from the cache_data specified.
"""
def _validate_stack_name(name):
try:
if not re.match("[a-zA-Z][a-zA-Z0-9_.-]{0,254}$", name):
message = _('Invalid stack name %s must contain '
'only alphanumeric or \"_-.\" characters, '
'must start with alpha and must be 255 '
'characters or less.') % name
raise exception.StackValidationFailed(message=message)
except TypeError:
message = _('Invalid stack name %s, must be a string') % name
raise exception.StackValidationFailed(message=message)
if owner_id is None:
_validate_stack_name(stack_name)
self.id = stack_id
self.owner_id = owner_id
self.context = context
self.name = stack_name
self.action = (self.ADOPT if adopt_stack_data else
self.CREATE if action is None else action)
self.status = self.IN_PROGRESS if status is None else status
self.status_reason = status_reason
self.timeout_mins = timeout_mins
self.disable_rollback = disable_rollback
self._outputs = None
self._resources = None
self._dependencies = None
self._implicit_deps_loaded = False
self._access_allowed_handlers = {}
self._db_resources = None
self._tags = tags
self.adopt_stack_data = adopt_stack_data
self.stack_user_project_id = stack_user_project_id
self.created_time = created_time
self.updated_time = updated_time
self.deleted_time = deleted_time
self.user_creds_id = user_creds_id
self.nested_depth = nested_depth
self.convergence = convergence
self.current_traversal = current_traversal
self.tags = tags
self.prev_raw_template_id = prev_raw_template_id
self.current_deps = current_deps
self._worker_client = None
self._convg_deps = None
self.thread_group_mgr = None
self.converge = converge
# strict_validate can be used to disable value validation
# in the resource properties schema, this is useful when
# performing validation when properties reference attributes
# for not-yet-created resources (which return None)
self.strict_validate = strict_validate
self.in_convergence_check = cache_data is not None
if use_stored_context:
self.context = self.stored_context()
self.clients = self.context.clients
# This will use the provided tenant ID when loading the stack
# from the DB or get it from the context for new stacks.
self.tenant_id = tenant_id or self.context.tenant_id
self.username = username or self.context.username
resources.initialise()
parent_info = parent_rsrc.ParentResourceProxy(context,
parent_resource,
owner_id)
if tmpl is not None:
self.defn = stk_defn.StackDefinition(context, tmpl,
self.identifier(),
cache_data or {},
parent_info)
else:
self.defn = None
@property
def tags(self):
if self._tags is None:
tags = stack_tag_object.StackTagList.get(
self.context, self.id)
if tags:
self._tags = [t.tag for t in tags]
return self._tags
@tags.setter
def tags(self, value):
self._tags = value
@property
def worker_client(self):
"""Return a client for making engine RPC calls."""
if not self._worker_client:
self._worker_client = rpc_worker_client.WorkerClient()
return self._worker_client
@property
def t(self):
"""The stack template."""
if self.defn is None:
return None
return self.defn.t
@t.setter
def t(self, tmpl):
"""Set the stack template."""
self.defn = self.defn.clone_with_new_template(tmpl, self.identifier())
@property
def parameters(self):
return self.defn.parameters
@property
def env(self):
"""The stack environment"""
return self.defn.env
@property
def parent_resource_name(self):
parent_info = self.defn.parent_resource
return parent_info and parent_info.name
@property
def parent_resource(self):
"""Dynamically load up the parent_resource.
Note: this should only be used by "Fn::ResourceFacade"
"""
return self.defn.parent_resource
[docs] def set_parent_stack(self, parent_stack):
parent_info = self.defn.parent_resource
if parent_info is not None:
parent_rsrc.use_parent_stack(parent_info, parent_stack)
[docs] def stored_context(self):
if self.user_creds_id:
creds_obj = ucreds_object.UserCreds.get_by_id(
self.context, self.user_creds_id)
# Maintain request_id from self.context so we retain traceability
# in situations where servicing a request requires switching from
# the request context to the stored context
creds = creds_obj.obj_to_primitive()["versioned_object.data"]
creds['request_id'] = self.context.request_id
# We don't store roles in the user_creds table, so disable the
# policy check for admin by setting is_admin=False.
creds['is_admin'] = False
creds['overwrite'] = False
return common_context.StoredContext.from_dict(creds)
else:
msg = _("Attempt to use stored_context with no user_creds")
raise exception.Error(msg)
@property
def outputs(self):
return {n: self.defn.output_definition(n)
for n in self.defn.enabled_output_names()}
def _resources_for_defn(self, stack_defn):
return {
name: resource.Resource(name,
stack_defn.resource_definition(name),
self)
for name in stack_defn.enabled_rsrc_names()
}
@property
def resources(self):
if self._resources is None:
self._resources = self._resources_for_defn(self.defn)
return self._resources
def _update_all_resource_data(self, for_resources, for_outputs):
for rsrc in self._explicit_dependencies():
node_data = rsrc.node_data(for_resources=for_resources,
for_outputs=for_outputs)
stk_defn.update_resource_data(self.defn, rsrc.name, node_data)
def _find_filtered_resources(self, filters=None):
if filters:
assert not self.in_convergence_check, \
"Resources should not be loaded from the DB"
resources = resource_objects.Resource.get_all_by_stack(
self.context, self.id, filters)
else:
resources = self._db_resources_get()
stk_def_cache = {}
for rsc in six.itervalues(resources):
loaded_res = self._resource_from_db_resource(rsc, stk_def_cache)
if loaded_res is not None:
yield loaded_res
[docs] def iter_resources(self, nested_depth=0, filters=None):
"""Iterates over all the resources in a stack.
Iterating includes nested stacks up to `nested_depth` levels below.
"""
for res in self._find_filtered_resources(filters):
yield res
resources = self._find_filtered_resources()
for res in resources:
if not res.has_nested() or nested_depth == 0:
continue
nested_stack = res.nested()
if nested_stack is None:
continue
for nested_res in nested_stack.iter_resources(nested_depth - 1,
filters):
yield nested_res
[docs] def db_active_resources_get(self):
resources = resource_objects.Resource.get_all_active_by_stack(
self.context, self.id)
return resources or None
[docs] def db_resource_get(self, name):
if self.id is None:
return None
return self._db_resources_get().get(name)
def _db_resources_get(self):
if self._db_resources is None:
assert not self.in_convergence_check, \
"Resources should not be loaded from the DB"
_db_resources = resource_objects.Resource.get_all_by_stack(
self.context, self.id)
if not _db_resources:
return {}
self._db_resources = _db_resources
return self._db_resources
@contextlib.contextmanager
def _previous_definition(self, stk_defn):
cur_defn = self.defn
try:
self.defn = stk_defn
yield
finally:
self.defn = cur_defn
def _resource_from_db_resource(self, db_res, stk_def_cache=None):
tid = db_res.current_template_id
if tid is None:
tid = self.t.id
if tid == self.t.id:
cur_res = self.resources.get(db_res.name)
if cur_res is not None and (cur_res.id == db_res.id):
return cur_res
stk_def = self.defn
elif stk_def_cache and tid in stk_def_cache:
stk_def = stk_def_cache[tid]
else:
try:
t = tmpl.Template.load(self.context, tid)
except exception.NotFound:
return None
stk_def = self.defn.clone_with_new_template(t,
self.identifier())
if stk_def_cache is not None:
stk_def_cache[tid] = stk_def
try:
defn = stk_def.resource_definition(db_res.name)
except KeyError:
return None
with self._previous_definition(stk_def):
res = resource.Resource(db_res.name, defn, self)
res._load_data(db_res)
return res
[docs] def resource_get(self, name):
"""Return a stack resource, even if not in the current template."""
res = self.resources.get(name)
if res:
return res
# fall back to getting the resource from the database
db_res = self.db_resource_get(name)
if db_res:
return self._resource_from_db_resource(db_res)
return None
@property
def dependencies(self):
if not self._implicit_deps_loaded:
self._explicit_dependencies()
self._add_implicit_dependencies(self._dependencies,
ignore_errors=self.id is not None)
self._implicit_deps_loaded = True
return self._dependencies
[docs] def root_stack_id(self):
if not self.owner_id:
return self.id
return stack_object.Stack.get_root_id(self.context, self.owner_id)
[docs] def object_path_in_stack(self):
"""Return stack resources and stacks in path from the root stack.
If this is not nested return (None, self), else return stack resources
and stacks in path from the root stack and including this stack.
Note that this is horribly inefficient, as it requires us to load every
stack in the chain back to the root in memory at the same time.
:returns: a list of (stack_resource, stack) tuples.
"""
if self.parent_resource:
parent_stack = self.parent_resource._stack()
if parent_stack is not None:
path = parent_stack.object_path_in_stack()
path.extend([(self.parent_resource, self)])
return path
return [(None, self)]
[docs] def path_in_stack(self):
"""Return tuples of names in path from the root stack.
If this is not nested return (None, self.name), else return tuples of
names (stack_resource.name, stack.name) in path from the root stack and
including this stack.
:returns: a list of (string, string) tuples.
"""
opis = self.object_path_in_stack()
return [(stckres.name if stckres else None,
stck.name if stck else None) for stckres, stck in opis]
[docs] def total_resources(self, stack_id=None):
"""Return the total number of resources in a stack.
Includes nested stacks below.
"""
if not stack_id:
if self.id is None:
# We're not stored yet, so we don't have anything to count
return 0
stack_id = self.id
return stack_object.Stack.count_total_resources(self.context, stack_id)
def _set_param_stackid(self):
"""Update self.parameters with the current ARN.
The ARN is then provided via the Parameters class as the StackId pseudo
parameter.
"""
if not self.parameters.set_stack_id(self.identifier()):
LOG.warning("Unable to set parameters StackId identifier")
def _explicit_dependencies(self):
"""Return dependencies without making any resource plugin calls.
This includes at least all of the dependencies that are explicitly
expressed in the template (via depends_on or an intrinsic function). It
may include implicit dependencies defined by resource plugins, but only
if they have already been calculated.
"""
if self._dependencies is None:
deps = dependencies.Dependencies()
for res in six.itervalues(self.resources):
res.add_explicit_dependencies(deps)
self._dependencies = deps
return self._dependencies
def _add_implicit_dependencies(self, deps, ignore_errors=True):
"""Augment the given dependencies with implicit ones from plugins."""
for res in six.itervalues(self.resources):
try:
res.add_dependencies(deps)
except Exception as exc:
# Always ignore ValueError/TypeError, as they're likely to
# have come from trying to read invalid property values that
# haven't been validated yet.
if not (ignore_errors or
isinstance(exc, (ValueError, TypeError))):
raise
else:
LOG.warning('Ignoring error adding implicit '
'dependencies for %(res)s: %(err)s',
{'res': six.text_type(res),
'err': six.text_type(exc)})
[docs] @classmethod
def load(cls, context, stack_id=None, stack=None, show_deleted=True,
use_stored_context=False, force_reload=False, cache_data=None,
load_template=True):
"""Retrieve a Stack from the database."""
if stack is None:
stack = stack_object.Stack.get_by_id(
context,
stack_id,
show_deleted=show_deleted)
if stack is None:
message = _('No stack exists with id "%s"') % str(stack_id)
raise exception.NotFound(message)
if force_reload:
stack.refresh()
return cls._from_db(context, stack,
use_stored_context=use_stored_context,
cache_data=cache_data,
load_template=load_template)
[docs] @classmethod
def load_all(cls, context, limit=None, marker=None, sort_keys=None,
sort_dir=None, filters=None,
show_deleted=False,
show_nested=False, show_hidden=False, tags=None,
tags_any=None, not_tags=None, not_tags_any=None):
stacks = stack_object.Stack.get_all(
context,
limit=limit,
sort_keys=sort_keys,
marker=marker,
sort_dir=sort_dir,
filters=filters,
show_deleted=show_deleted,
show_nested=show_nested,
show_hidden=show_hidden,
tags=tags,
tags_any=tags_any,
not_tags=not_tags,
not_tags_any=not_tags_any,
eager_load=True)
for stack in stacks:
try:
yield cls._from_db(context, stack)
except exception.NotFound:
# We're in a different transaction than the get_all, so a stack
# returned above can be deleted by the time we try to load it.
pass
@classmethod
def _from_db(cls, context, stack,
use_stored_context=False, cache_data=None,
load_template=True):
if load_template:
template = tmpl.Template.load(
context, stack.raw_template_id, stack.raw_template)
else:
template = None
return cls(context, stack.name, template,
stack_id=stack.id,
action=stack.action, status=stack.status,
status_reason=stack.status_reason,
timeout_mins=stack.timeout,
disable_rollback=stack.disable_rollback,
parent_resource=stack.parent_resource_name,
owner_id=stack.owner_id,
stack_user_project_id=stack.stack_user_project_id,
created_time=stack.created_at,
updated_time=stack.updated_at,
user_creds_id=stack.user_creds_id, tenant_id=stack.tenant,
use_stored_context=use_stored_context,
username=stack.username, convergence=stack.convergence,
current_traversal=stack.current_traversal,
prev_raw_template_id=stack.prev_raw_template_id,
current_deps=stack.current_deps, cache_data=cache_data,
nested_depth=stack.nested_depth,
deleted_time=stack.deleted_at)
[docs] def get_kwargs_for_cloning(self, keep_status=False, only_db=False,
keep_tags=False):
"""Get common kwargs for calling Stack() for cloning.
The point of this method is to reduce the number of places that we
need to update when a kwarg to Stack.__init__() is modified. It
is otherwise easy to forget an option and cause some unexpected
error if this option is lost.
Note:
- This doesn't return the args(name, template) but only the kwargs.
- We often want to start 'fresh' so don't want to maintain the old
status, action and status_reason.
- We sometimes only want the DB attributes.
"""
stack = {
'owner_id': self.owner_id,
'username': self.username,
'disable_rollback': self.disable_rollback,
'stack_user_project_id': self.stack_user_project_id,
'user_creds_id': self.user_creds_id,
'nested_depth': self.nested_depth,
'convergence': self.convergence,
'current_traversal': self.current_traversal,
'prev_raw_template_id': self.prev_raw_template_id,
'current_deps': self.current_deps
}
if keep_status:
stack.update({
'action': self.action,
'status': self.status,
'status_reason': six.text_type(self.status_reason)})
if only_db:
stack['parent_resource_name'] = self.parent_resource_name
stack['tenant'] = self.tenant_id
stack['timeout'] = self.timeout_mins
else:
stack['parent_resource'] = self.parent_resource_name
stack['tenant_id'] = self.tenant_id
stack['timeout_mins'] = self.timeout_mins
stack['strict_validate'] = self.strict_validate
if keep_tags:
stack['tags'] = self.tags
return stack
[docs] @profiler.trace('Stack.store', hide_args=False)
def store(self, backup=False, exp_trvsl=None,
ignore_traversal_check=False):
"""Store the stack in the database and return its ID.
If self.id is set, we update the existing stack.
"""
s = self.get_kwargs_for_cloning(keep_status=True, only_db=True)
s['name'] = self.name
s['backup'] = backup
s['updated_at'] = self.updated_time
if self.t.id is None:
stack_object.Stack.encrypt_hidden_parameters(self.t)
s['raw_template_id'] = self.t.store(self.context)
else:
s['raw_template_id'] = self.t.id
if self.id is not None:
if exp_trvsl is None and not ignore_traversal_check:
exp_trvsl = self.current_traversal
if self.convergence:
# do things differently for convergence
updated = stack_object.Stack.select_and_update(
self.context, self.id, s, exp_trvsl=exp_trvsl)
if not updated:
return None
else:
stack_object.Stack.update_by_id(self.context, self.id, s)
else:
if not self.user_creds_id:
# Create a context containing a trust_id and trustor_user_id
# if trusts are enabled
if cfg.CONF.deferred_auth_method == 'trusts':
keystone = self.clients.client('keystone')
trust_ctx = keystone.create_trust_context()
new_creds = ucreds_object.UserCreds.create(trust_ctx)
else:
new_creds = ucreds_object.UserCreds.create(self.context)
s['user_creds_id'] = new_creds.id
self.user_creds_id = new_creds.id
if self.convergence:
# create a traversal ID
self.current_traversal = uuidutils.generate_uuid()
s['current_traversal'] = self.current_traversal
new_s = stack_object.Stack.create(self.context, s)
self.id = new_s.id
self.created_time = new_s.created_at
if self.tags:
stack_tag_object.StackTagList.set(self.context, self.id, self.tags)
self._set_param_stackid()
return self.id
def _backup_name(self):
return '%s*' % self.name
[docs] def identifier(self):
"""Return an identifier for this stack."""
return identifier.HeatIdentifier(self.tenant_id, self.name, self.id)
def __iter__(self):
"""Return an iterator over the resource names."""
return iter(self.resources)
def __len__(self):
"""Return the number of resources."""
return len(self.resources)
def __getitem__(self, key):
"""Get the resource with the specified name."""
return self.resources[key]
[docs] def add_resource(self, resource):
"""Insert the given resource into the stack."""
resource._rsrc_prop_data_id = None
template = resource.stack.t
resource.stack = self
definition = resource.t.reparse(self.defn, template)
resource.t = definition
resource.reparse()
self.resources[resource.name] = resource
stk_defn.add_resource(self.defn, definition)
if self.t.id is not None:
self.t.store(self.context)
resource.store()
[docs] def remove_resource(self, resource_name):
"""Remove the resource with the specified name."""
del self.resources[resource_name]
stk_defn.remove_resource(self.defn, resource_name)
if self.t.id is not None:
self.t.store(self.context)
def __contains__(self, key):
"""Determine whether the stack contains the specified resource."""
if self._resources is not None:
return key in self.resources
else:
return key in self.t[self.t.RESOURCES]
def __eq__(self, other):
"""Compare two Stacks for equality.
Stacks are considered equal only if they are identical.
"""
return self is other
def __ne__(self, other):
return not self.__eq__(other)
def __str__(self):
"""Return a human-readable string representation of the stack."""
text = 'Stack "%s" [%s]' % (self.name, self.id)
return six.text_type(text)
[docs] def resource_by_refid(self, refid):
"""Return the resource in this stack with the specified refid.
:returns: resource in this stack with the specified refid, or None if
not found.
"""
for r in six.itervalues(self):
if r.state not in ((r.INIT, r.COMPLETE),
(r.CREATE, r.IN_PROGRESS),
(r.CREATE, r.COMPLETE),
(r.RESUME, r.IN_PROGRESS),
(r.RESUME, r.COMPLETE),
(r.UPDATE, r.IN_PROGRESS),
(r.UPDATE, r.COMPLETE),
(r.CHECK, r.COMPLETE)):
continue
proxy = self.defn[r.name]
if proxy._resource_data is None:
matches = r.FnGetRefId() == refid or r.name == refid
else:
matches = proxy.FnGetRefId() == refid
if matches:
if self.in_convergence_check and r.id is not None:
# We don't have resources loaded from the database at this
# point, so load the data for just this one from the DB.
db_res = resource_objects.Resource.get_obj(self.context,
r.id)
if db_res is not None:
r._load_data(db_res)
return r
[docs] def register_access_allowed_handler(self, credential_id, handler):
"""Register an authorization handler function.
Register a function which determines whether the credentials with a
given ID can have access to a named resource.
"""
assert callable(handler), 'Handler is not callable'
self._access_allowed_handlers[credential_id] = handler
[docs] def access_allowed(self, credential_id, resource_name):
"""Is credential_id authorised to access resource by resource_name."""
if not self.resources or resource_name not in self.resources:
# this handle the case that sd in action delete,
# try to load access_allowed_handlers if resources object
# haven't been loaded.
[res.name for res in self.iter_resources()]
handler = self._access_allowed_handlers.get(credential_id)
return handler and handler(resource_name)
[docs] @profiler.trace('Stack.validate', hide_args=False)
def validate(self, ignorable_errors=None, validate_res_tmpl_only=False):
"""Validates the stack."""
# TODO(sdake) Should return line number of invalid reference
# validate overall template (top-level structure)
self.t.validate()
# Validate parameters
self.parameters.validate(context=self.context,
validate_value=self.strict_validate)
# Validate Parameter Groups
parameter_groups = param_groups.ParameterGroups(self.t)
parameter_groups.validate()
# Continue to call this function, since old third-party Template
# plugins may depend on it being called to validate the resource
# definitions before actually generating them.
if (type(self.t).validate_resource_definitions !=
tmpl.Template.validate_resource_definitions):
warnings.warn("The Template.validate_resource_definitions() "
"method is deprecated and will no longer be called "
"in future versions of Heat. Template subclasses "
"should validate resource definitions in the "
"resource_definitions() method.",
DeprecationWarning)
self.t.validate_resource_definitions(self)
self.t.conditions(self).validate()
# Load the resources definitions (success of which implies the
# definitions are valid)
resources = self.resources
# Check duplicate names between parameters and resources
dup_names = set(self.parameters) & set(resources)
if dup_names:
LOG.debug("Duplicate names %s" % dup_names)
raise exception.StackValidationFailed(
message=_("Duplicate names %s") % dup_names)
self._update_all_resource_data(for_resources=True, for_outputs=True)
if self.strict_validate:
iter_rsc = self.dependencies
else:
iter_rsc = self._explicit_dependencies()
unique_defns = set(res.t for res in six.itervalues(resources))
unique_defn_names = set(defn.name for defn in unique_defns)
for res in iter_rsc:
# Don't validate identical definitions multiple times
if res.name not in unique_defn_names:
continue
result = None
try:
if not validate_res_tmpl_only:
if res.external_id is not None:
res.validate_external()
continue
result = res.validate()
elif res.external_id is None:
result = res.validate_template()
except exception.HeatException as ex:
LOG.debug('%s', ex)
if ignorable_errors and ex.error_code in ignorable_errors:
result = None
else:
raise
except AssertionError:
raise
except Exception as ex:
LOG.info("Exception in stack validation",
exc_info=True)
raise exception.StackValidationFailed(error=ex,
resource=res)
if result:
raise exception.StackValidationFailed(message=result)
eventlet.sleep(0)
for op_name, output in six.iteritems(self.outputs):
try:
output.validate()
except exception.StackValidationFailed as ex:
path = [self.t.OUTPUTS, op_name,
self.t.get_section_name(ex.path[0])]
path.extend(ex.path[1:])
raise exception.StackValidationFailed(
error=ex.error,
path=path,
message=ex.error_message)
[docs] def requires_deferred_auth(self):
"""Determine whether to perform API requests with deferred auth.
Returns whether this stack may need to perform API requests
during its lifecycle using the configured deferred authentication
method.
"""
return any(res.requires_deferred_auth for res in six.itervalues(self))
def _add_event(self, action, status, reason):
"""Add a state change event to the database."""
ev = event.Event(self.context, self, action, status, reason,
self.id, None, None,
self.name, 'OS::Heat::Stack')
ev.store()
self.dispatch_event(ev)
[docs] def dispatch_event(self, ev):
def _dispatch(ctx, sinks, ev):
try:
for sink in sinks:
sink.consume(ctx, ev)
except Exception as e:
LOG.debug('Got error sending events %s', e)
if self.thread_group_mgr is not None:
self.thread_group_mgr.start(self.id, _dispatch,
self.context,
self.env.get_event_sinks(),
ev.as_dict())
[docs] def defer_state_persist(self):
"""Return whether to defer persisting the state.
If persistence is deferred, the new state will not be written to the
database until the stack lock is released (by calling
persist_state_and_release_lock()). This prevents races in the legacy
path where an observer sees the stack COMPLETE but an engine still
holds the lock.
"""
if self.status == self.IN_PROGRESS:
# Always persist IN_PROGRESS immediately
return False
if (self.convergence and
self.action in {self.UPDATE, self.DELETE, self.CREATE,
self.ADOPT, self.ROLLBACK, self.RESTORE}):
# These operations do not use the stack lock in convergence, so
# never defer.
return False
return self.action not in {self.UPDATE, self.DELETE, self.ROLLBACK,
self.RESTORE}
[docs] @profiler.trace('Stack.state_set', hide_args=False)
def state_set(self, action, status, reason):
"""Update the stack state."""
if action not in self.ACTIONS:
raise ValueError(_("Invalid action %s") % action)
if status not in self.STATUSES:
raise ValueError(_("Invalid status %s") % status)
self.action = action
self.status = status
self.status_reason = reason
self._log_status()
if not self.defer_state_persist():
updated = self._persist_state()
if self.convergence and not updated:
LOG.info("Stack %(name)s traversal %(trvsl_id)s no longer "
"active; not setting state to %(action)s_%(status)s",
{'name': self.name,
'trvsl_id': self.current_traversal,
'action': action, 'status': status})
return updated
def _log_status(self):
LOG.info('Stack %(action)s %(status)s (%(name)s): %(reason)s',
{'action': self.action,
'status': self.status,
'name': self.name,
'reason': self.status_reason})
def _persist_state(self):
"""Persist stack state to database"""
if self.id is None:
return
stack = stack_object.Stack.get_by_id(self.context, self.id,
eager_load=False)
if stack is not None:
values = {'action': self.action,
'status': self.status,
'status_reason': six.text_type(self.status_reason)}
self._send_notification_and_add_event()
if self.convergence:
# do things differently for convergence
updated = stack_object.Stack.select_and_update(
self.context, self.id, values,
exp_trvsl=self.current_traversal)
return updated
else:
stack.update_and_save(values)
def _send_notification_and_add_event(self):
LOG.debug('Persisting stack %(name)s status %(action)s %(status)s',
{'action': self.action,
'status': self.status,
'name': self.name})
notification.send(self)
self._add_event(self.action, self.status, self.status_reason)
[docs] def persist_state_and_release_lock(self, engine_id):
"""Persist stack state to database and release stack lock"""
if self.id is None:
return
stack = stack_object.Stack.get_by_id(self.context, self.id,
eager_load=False)
if stack is not None:
values = {'action': self.action,
'status': self.status,
'status_reason': six.text_type(self.status_reason)}
self._send_notification_and_add_event()
stack.persist_state_and_release_lock(self.context, self.id,
engine_id, values)
@property
def state(self):
"""Returns state, tuple of action, status."""
return (self.action, self.status)
[docs] def timeout_secs(self):
"""Return the stack action timeout in seconds."""
if self.timeout_mins is None:
return cfg.CONF.stack_action_timeout
return self.timeout_mins * 60
[docs] def preview_resources(self):
"""Preview the stack with all of the resources."""
return [resource.preview()
for resource in six.itervalues(self.resources)]
[docs] def get_nested_parameters(self, filter_func):
"""Return nested parameters schema, if any.
This introspects the resources to return the parameters of the nested
stacks. It uses the `get_nested_parameters_stack` API to build the
stack.
"""
result = {}
for name, rsrc in six.iteritems(self.resources):
nested = rsrc.get_nested_parameters_stack()
if nested is None:
continue
nested_params = nested.parameters.map(
api.format_validate_parameter,
filter_func=filter_func)
params = {
'Type': rsrc.type(),
'Description': nested.t.get('Description', ''),
'Parameters': nested_params
}
# Add parameter_groups if it is present in nested stack
nested_pg = param_groups.ParameterGroups(nested.t)
if nested_pg.parameter_groups:
params.update({'ParameterGroups': nested_pg.parameter_groups})
params.update(nested.get_nested_parameters(filter_func))
result[name] = params
return {'NestedParameters': result} if result else {}
def _store_resources(self):
for r in reversed(self.dependencies):
if r.action == r.INIT:
r.store()
[docs] @profiler.trace('Stack.create', hide_args=False)
@reset_state_on_error
def create(self, msg_queue=None):
"""Create the stack and all of the resources."""
def rollback():
if not self.disable_rollback and self.state == (self.CREATE,
self.FAILED):
self.delete(action=self.ROLLBACK)
self._store_resources()
check_message = functools.partial(self._check_for_message, msg_queue)
creator = scheduler.TaskRunner(
self.stack_task, action=self.CREATE,
reverse=False, post_func=rollback)
creator(timeout=self.timeout_secs(), progress_callback=check_message)
def _adopt_kwargs(self, resource):
data = self.adopt_stack_data
if not data or not data.get('resources'):
return {'resource_data': None}
return {'resource_data': data['resources'].get(resource.name)}
[docs] @scheduler.wrappertask
def stack_task(self, action, reverse=False, post_func=None,
aggregate_exceptions=False, pre_completion_func=None,
notify=None):
"""A task to perform an action on the stack.
All of the resources are traversed in forward or reverse dependency
order.
:param action: action that should be executed with stack resources
:param reverse: define if action on the resources need to be executed
in reverse dependency order
:param post_func: function that need to be executed after
action complete on the stack
:param aggregate_exceptions: define if exceptions should be aggregated
:param pre_completion_func: function that need to be executed right
before action completion; uses stack,
action, status and reason as input
parameters
"""
try:
lifecycle_plugin_utils.do_pre_ops(self.context, self,
None, action)
except Exception as e:
self.state_set(action, self.FAILED, e.args[0] if e.args else
'Failed stack pre-ops: %s' % six.text_type(e))
if callable(post_func):
post_func()
if notify is not None:
# No need to call notify.signal(), because persistence of the
# state is always deferred here.
assert self.defer_state_persist()
return
self.state_set(action, self.IN_PROGRESS,
'Stack %s started' % action)
if notify is not None:
notify.signal()
stack_status = self.COMPLETE
reason = 'Stack %s completed successfully' % action
action_method = action.lower()
# If a local _$action_kwargs function exists, call it to get the
# action specific argument list, otherwise an empty arg list
handle_kwargs = getattr(self,
'_%s_kwargs' % action_method,
lambda x: {})
@functools.wraps(getattr(resource.Resource, action_method))
@scheduler.wrappertask
def resource_action(r):
# Find e.g resource.create and call it
handle = getattr(r, action_method)
yield handle(**handle_kwargs(r))
if action == self.CREATE:
stk_defn.update_resource_data(self.defn, r.name, r.node_data())
def get_error_wait_time(resource):
return resource.cancel_grace_period()
action_task = scheduler.DependencyTaskGroup(
self.dependencies,
resource_action,
reverse,
error_wait_time=get_error_wait_time,
aggregate_exceptions=aggregate_exceptions)
try:
yield action_task()
except scheduler.Timeout:
stack_status = self.FAILED
reason = '%s timed out' % action.title()
except Exception as ex:
# We use a catch-all here to ensure any raised exceptions
# make the stack fail. This is necessary for when
# aggregate_exceptions is false, as in that case we don't get
# ExceptionGroup, but the raw exception.
# see scheduler.py line 395-399
stack_status = self.FAILED
reason = 'Resource %s failed: %s' % (action, six.text_type(ex))
if pre_completion_func:
pre_completion_func(self, action, stack_status, reason)
self.state_set(action, stack_status, reason)
if callable(post_func):
post_func()
lifecycle_plugin_utils.do_post_ops(self.context, self, None, action,
(self.status == self.FAILED))
[docs] @profiler.trace('Stack.check', hide_args=False)
@reset_state_on_error
def check(self, notify=None):
if self.convergence:
self._update_or_store_resources()
self.updated_time = oslo_timeutils.utcnow()
checker = scheduler.TaskRunner(
self.stack_task, self.CHECK,
post_func=self.supports_check_action,
aggregate_exceptions=True,
notify=notify)
checker()
[docs] def supports_check_action(self):
def is_supported(res):
if res.has_nested() and res.nested():
return res.nested().supports_check_action()
else:
return hasattr(res, 'handle_%s' % res.CHECK.lower())
all_supported = all(is_supported(res)
for res in six.itervalues(self.resources))
if not all_supported:
msg = ". '%s' not fully supported (see resources)" % self.CHECK
reason = self.status_reason + msg
self.state_set(self.CHECK, self.status, reason)
return all_supported
@profiler.trace('Stack._backup_stack', hide_args=False)
def _backup_stack(self, create_if_missing=True):
"""Backup the stack.
Get a Stack containing any in-progress resources from the previous
stack state prior to an update.
"""
s = stack_object.Stack.get_by_name_and_owner_id(
self.context,
self._backup_name(),
owner_id=self.id)
if s is not None:
LOG.debug('Loaded existing backup stack')
return self.load(self.context, stack=s)
elif create_if_missing:
kwargs = self.get_kwargs_for_cloning(keep_tags=True)
kwargs['owner_id'] = self.id
del(kwargs['prev_raw_template_id'])
prev = type(self)(self.context, self._backup_name(),
copy.deepcopy(self.t),
**kwargs)
prev.store(backup=True)
LOG.debug('Created new backup stack')
return prev
else:
return None
[docs] @profiler.trace('Stack.adopt', hide_args=False)
@reset_state_on_error
def adopt(self):
"""Adopt existing resources into a new stack."""
def rollback():
if not self.disable_rollback and self.state == (self.ADOPT,
self.FAILED):
# enter the same flow as abandon and just delete the stack
for res in six.itervalues(self.resources):
res.abandon_in_progress = True
self.delete(action=self.ROLLBACK, abandon=True)
creator = scheduler.TaskRunner(
self.stack_task,
action=self.ADOPT,
reverse=False,
post_func=rollback)
creator(timeout=self.timeout_secs())
[docs] @profiler.trace('Stack.update', hide_args=False)
@reset_state_on_error
def update(self, newstack, msg_queue=None, notify=None):
"""Update the stack.
Compare the current stack with newstack,
and where necessary create/update/delete the resources until
this stack aligns with newstack.
Note update of existing stack resources depends on update
being implemented in the underlying resource types
Update will fail if it exceeds the specified timeout. The default is
60 minutes, set in the constructor
"""
self.updated_time = oslo_timeutils.utcnow()
updater = scheduler.TaskRunner(self.update_task, newstack,
msg_queue=msg_queue, notify=notify)
updater()
[docs] @profiler.trace('Stack.converge_stack', hide_args=False)
@reset_state_on_error
def converge_stack(self, template, action=UPDATE, new_stack=None,
pre_converge=None):
"""Update the stack template and trigger convergence for resources."""
if action not in [self.CREATE, self.ADOPT]:
# no back-up template for create action
self.prev_raw_template_id = getattr(self.t, 'id', None)
# switch template and reset dependencies
self.defn = self.defn.clone_with_new_template(template,
self.identifier(),
clear_resource_data=True)
self.reset_dependencies()
self._resources = None
if action != self.CREATE:
self.updated_time = oslo_timeutils.utcnow()
if new_stack is not None:
self.disable_rollback = new_stack.disable_rollback
self.timeout_mins = new_stack.timeout_mins
self.converge = new_stack.converge
self.defn = new_stack.defn
self._set_param_stackid()
self.tags = new_stack.tags
if new_stack.tags:
stack_tag_object.StackTagList.set(self.context, self.id,
new_stack.tags)
else:
stack_tag_object.StackTagList.delete(self.context, self.id)
self.action = action
self.status = self.IN_PROGRESS
self.status_reason = 'Stack %s started' % self.action
# generate new traversal and store
previous_traversal = self.current_traversal
self.current_traversal = uuidutils.generate_uuid()
# we expect to update the stack having previous traversal ID
stack_id = self.store(exp_trvsl=previous_traversal)
if stack_id is None:
LOG.warning("Failed to store stack %(name)s with traversal "
"ID %(trvsl_id)s, aborting stack %(action)s",
{'name': self.name, 'trvsl_id': previous_traversal,
'action': self.action})
return
self._send_notification_and_add_event()
# delete the prev traversal sync_points
if previous_traversal:
sync_point.delete_all(self.context, self.id, previous_traversal)
# TODO(later): lifecycle_plugin_utils.do_pre_ops
self.thread_group_mgr.start(self.id, self._converge_create_or_update,
pre_converge=pre_converge)
@reset_state_on_error
def _converge_create_or_update(self, pre_converge=None):
current_resources = self._update_or_store_resources()
self._compute_convg_dependencies(self.ext_rsrcs_db, self.dependencies,
current_resources)
# Store list of edges
self.current_deps = {
'edges': [[rqr, rqd] for rqr, rqd in
self.convergence_dependencies.graph().edges()]}
stack_id = self.store()
if stack_id is None:
# Failed concurrent update
LOG.warning("Failed to store stack %(name)s with traversal "
"ID %(trvsl_id)s, aborting stack %(action)s",
{'name': self.name, 'trvsl_id': self.current_traversal,
'action': self.action})
return
if callable(pre_converge):
pre_converge()
if self.action == self.DELETE:
try:
self.delete_all_snapshots()
except Exception as exc:
self.state_set(self.action, self.FAILED, six.text_type(exc))
self.purge_db()
return
LOG.debug('Starting traversal %s with dependencies: %s',
self.current_traversal, self.convergence_dependencies)
# create sync_points for resources in DB
for rsrc_id, is_update in self.convergence_dependencies:
sync_point.create(self.context, rsrc_id,
self.current_traversal, is_update,
self.id)
# create sync_point entry for stack
sync_point.create(
self.context, self.id, self.current_traversal, True, self.id)
leaves = set(self.convergence_dependencies.leaves())
if not leaves:
self.mark_complete()
else:
for rsrc_id, is_update in sorted(leaves,
key=lambda n: n.is_update):
if is_update:
LOG.info("Triggering resource %s for update", rsrc_id)
else:
LOG.info("Triggering resource %s for cleanup",
rsrc_id)
input_data = sync_point.serialize_input_data({})
self.worker_client.check_resource(self.context, rsrc_id,
self.current_traversal,
input_data, is_update,
self.adopt_stack_data,
self.converge)
if scheduler.ENABLE_SLEEP:
eventlet.sleep(1)
[docs] def rollback(self):
old_tmpl_id = self.prev_raw_template_id
if old_tmpl_id is None:
rollback_tmpl = tmpl.Template.create_empty_template(
version=self.t.version)
else:
rollback_tmpl = tmpl.Template.load(self.context, old_tmpl_id)
self.prev_raw_template_id = None
stack_id = self.store()
if stack_id is None:
# Failed concurrent update
LOG.warning("Failed to store stack %(name)s with traversal"
" ID %(trvsl_id)s, not triggering rollback.",
{'name': self.name,
'trvsl_id': self.current_traversal})
return
self.converge_stack(rollback_tmpl, action=self.ROLLBACK)
def _get_best_existing_rsrc_db(self, rsrc_name):
if self.ext_rsrcs_db:
def suitability(ext_rsrc):
score = 0
if ext_rsrc.status == status.ResourceStatus.FAILED:
score -= 30
if ext_rsrc.action == status.ResourceStatus.DELETE:
score -= 50
if ext_rsrc.replaced_by:
score -= 1
if ext_rsrc.current_template_id == self.prev_raw_template_id:
# Current resource
score += 5
if ext_rsrc.current_template_id == self.t.id:
# Rolling back to previous resource
score += 10
return score, ext_rsrc.updated_at
candidates = sorted((r for r in self.ext_rsrcs_db.values()
if r.name == rsrc_name),
key=suitability,
reverse=True)
if candidates:
return candidates[0]
return None
def _update_or_store_resources(self):
self.ext_rsrcs_db = self.db_active_resources_get()
rsrcs = {}
for rsrc in reversed(self.dependencies):
existing_rsrc_db = self._get_best_existing_rsrc_db(rsrc.name)
if existing_rsrc_db is None:
rsrc.current_template_id = self.t.id
rsrc.store()
rsrcs[rsrc.name] = rsrc
else:
rsrcs[existing_rsrc_db.name] = existing_rsrc_db
return rsrcs
def _compute_convg_dependencies(self, existing_resources,
current_template_deps, current_resources):
def make_graph_key(rsrc):
return ConvergenceNode(current_resources[rsrc.name].id, True)
dep = current_template_deps.translate(make_graph_key)
if existing_resources:
for rsrc_id, rsrc in existing_resources.items():
dep += ConvergenceNode(rsrc_id, False), None
for requirement in rsrc.requires:
if requirement in existing_resources:
dep += (ConvergenceNode(requirement, False),
ConvergenceNode(rsrc_id, False))
if rsrc.replaces in existing_resources:
dep += (ConvergenceNode(rsrc.replaces, False),
ConvergenceNode(rsrc_id, False))
if ConvergenceNode(rsrc.id, True) in dep:
dep += (ConvergenceNode(rsrc_id, False),
ConvergenceNode(rsrc_id, True))
self._convg_deps = dep
@property
def convergence_dependencies(self):
if self._convg_deps is None:
current_deps = ((ConvergenceNode(*i),
ConvergenceNode(*j) if j is not None else None)
for i, j in self.current_deps['edges'])
self._convg_deps = dependencies.Dependencies(edges=current_deps)
return self._convg_deps
[docs] def dependent_resource_ids(self, resource_id):
"""Return a set of resource IDs that are dependent on another.
Given a resource ID, return a set of all other resource IDs that are
dependent on that one - that is to say, those that must be cleaned up
before the given resource is cleaned up.
"""
assert self.convergence, 'Invalid call for non-convergence stack'
clean_node = ConvergenceNode(resource_id, False)
deps = self.convergence_dependencies
if clean_node not in deps:
return set()
# Looking for the cleanup node, so use requires instead of required_by
dep_nodes = deps.requires(clean_node)
return set(n.rsrc_id for n in dep_nodes if not n.is_update)
[docs] def reset_stack_and_resources_in_progress(self, reason):
for name, rsrc in six.iteritems(self.resources):
if rsrc.status == rsrc.IN_PROGRESS:
rsrc.state_set(rsrc.action,
rsrc.FAILED,
six.text_type(reason))
self.state_set(self.action, self.FAILED, six.text_type(reason))
[docs] @scheduler.wrappertask
def update_task(self, newstack, action=UPDATE,
msg_queue=None, notify=None):
if action not in (self.UPDATE, self.ROLLBACK, self.RESTORE):
LOG.error("Unexpected action %s passed to update!", action)
self.state_set(self.UPDATE, self.FAILED,
"Invalid action %s" % action)
if notify is not None:
notify.signal()
return
try:
lifecycle_plugin_utils.do_pre_ops(self.context, self,
newstack, action)
except Exception as e:
self.state_set(action, self.FAILED, e.args[0] if e.args else
'Failed stack pre-ops: %s' % six.text_type(e))
if notify is not None:
notify.signal()
return
if self.status == self.IN_PROGRESS:
if action == self.ROLLBACK:
LOG.debug("Starting update rollback for %s", self.name)
else:
reason = _('Attempted to %s an IN_PROGRESS '
'stack') % action
self.reset_stack_and_resources_in_progress(reason)
if notify is not None:
notify.signal()
return
# Save a copy of the new template. To avoid two DB writes
# we store the ID at the same time as the action/status
prev_tmpl_id = self.prev_raw_template_id
# newstack.t may have been pre-stored, so save with that one
bu_tmpl, newstack.t = newstack.t, copy.deepcopy(newstack.t)
self.prev_raw_template_id = bu_tmpl.store(self.context)
self.action = action
self.status = self.IN_PROGRESS
self.status_reason = 'Stack %s started' % action
self._send_notification_and_add_event()
self.store()
# Notify the caller that the state is stored
if notify is not None:
notify.signal()
if prev_tmpl_id is not None:
raw_template_object.RawTemplate.delete(self.context, prev_tmpl_id)
if action == self.UPDATE:
# Oldstack is useless when the action is not UPDATE , so we don't
# need to build it, this can avoid some unexpected errors.
kwargs = self.get_kwargs_for_cloning(keep_tags=True)
self._ensure_encrypted_param_names_valid()
oldstack = Stack(self.context, self.name, copy.deepcopy(self.t),
**kwargs)
backup_stack = self._backup_stack()
existing_params = environment.Environment({env_fmt.PARAMETERS:
self.t.env.params})
previous_template_id = None
should_rollback = False
update_task = update.StackUpdate(
self, newstack, backup_stack,
rollback=action == self.ROLLBACK)
try:
updater = scheduler.TaskRunner(update_task)
self.defn.parameters = newstack.defn.parameters
self.defn.t.files = newstack.defn.t.files
self.defn.t.env = newstack.defn.t.env
self.disable_rollback = newstack.disable_rollback
self.timeout_mins = newstack.timeout_mins
self._set_param_stackid()
self.tags = newstack.tags
if newstack.tags:
stack_tag_object.StackTagList.set(self.context, self.id,
newstack.tags)
else:
stack_tag_object.StackTagList.delete(self.context, self.id)
check_message = functools.partial(self._check_for_message,
msg_queue)
try:
yield updater.as_task(timeout=self.timeout_secs(),
progress_callback=check_message)
finally:
self.reset_dependencies()
self.status_reason = 'Stack %s completed successfully' % action
self.status = self.COMPLETE
except scheduler.Timeout:
self.status = self.FAILED
self.status_reason = 'Timed out'
except Exception as e:
# If rollback is enabled when resource failure occurred,
# we do another update, with the existing template,
# so we roll back to the original state
should_rollback = self._update_exception_handler(e, action)
if should_rollback:
yield self.update_task(oldstack, action=self.ROLLBACK)
except BaseException as e:
with excutils.save_and_reraise_exception():
self._update_exception_handler(e, action)
else:
LOG.debug('Deleting backup stack')
backup_stack.delete(backup=True)
# flip the template to the newstack values
previous_template_id = self.t.id
self.t = newstack.t
self._outputs = None
finally:
if should_rollback:
# Already handled in rollback task
return
# Don't use state_set to do only one update query and avoid race
# condition with the COMPLETE status
self.action = action
self._log_status()
self._send_notification_and_add_event()
if self.status == self.FAILED:
# Since template was incrementally updated based on existing
# and new stack resources, we should have user params of both.
existing_params.load(newstack.t.env.user_env_as_dict())
self.t.env = existing_params
# Update the template version, in case new things were used
self.t.t[newstack.t.version[0]] = max(
newstack.t.version[1], self.t.version[1])
self.t.merge_snippets(newstack.t)
self.t.store(self.context)
backup_stack.t.env = existing_params
backup_stack.t.t[newstack.t.version[0]] = max(
newstack.t.version[1], self.t.version[1])
backup_stack.t.merge_snippets(newstack.t)
backup_stack.t.store(self.context)
self.store()
if previous_template_id is not None:
raw_template_object.RawTemplate.delete(self.context,
previous_template_id)
lifecycle_plugin_utils.do_post_ops(self.context, self,
newstack, action,
(self.status == self.FAILED))
def _update_exception_handler(self, exc, action):
"""Handle exceptions in update_task.
Decide if we should cancel tasks or not. Also decide if we should
rollback or not, depend on disable rollback flag if force rollback flag
not triggered.
:returns: a boolean for require rollback flag.
"""
self.status_reason = six.text_type(exc)
self.status = self.FAILED
if action != self.UPDATE:
return False
if isinstance(exc, ForcedCancel):
return exc.with_rollback or not self.disable_rollback
elif isinstance(exc, exception.ResourceFailure):
return not self.disable_rollback
else:
return False
def _ensure_encrypted_param_names_valid(self):
# If encryption was enabled when the stack was created but
# then disabled when the stack was updated, env.params and
# env.encrypted_param_names will be in an inconsistent
# state
if not cfg.CONF.encrypt_parameters_and_properties:
self.t.env.encrypted_param_names = []
@staticmethod
def _check_for_message(msg_queue):
if msg_queue is None:
return
try:
message = msg_queue.get_nowait()
except eventlet.queue.Empty:
return
if message == rpc_api.THREAD_CANCEL:
raise ForcedCancel(with_rollback=False)
elif message == rpc_api.THREAD_CANCEL_WITH_ROLLBACK:
raise ForcedCancel(with_rollback=True)
LOG.error('Unknown message "%s" received', message)
def _delete_backup_stack(self, stack):
# Delete resources in the backup stack referred to by 'stack'
def failed(child):
return (child.action == child.CREATE and
child.status in (child.FAILED, child.IN_PROGRESS))
def copy_data(source_res, destination_res):
if source_res.data():
for key, val in six.iteritems(source_res.data()):
destination_res.data_set(key, val)
for key, backup_res in stack.resources.items():
# If UpdateReplace is failed, we must restore backup_res
# to existing_stack in case of it may have dependencies in
# these stacks. curr_res is the resource that just
# created and failed, so put into the stack to delete anyway.
backup_res_id = backup_res.resource_id
curr_res = self.resources.get(key)
if backup_res_id is not None and curr_res is not None:
curr_res_id = curr_res.resource_id
if (any(failed(child) for child in
self.dependencies[curr_res]) or
curr_res.status in
(curr_res.FAILED, curr_res.IN_PROGRESS)):
# If child resource failed to update, curr_res
# should be replaced to resolve dependencies. But this
# is not fundamental solution. If there are update
# failer and success resources in the children, cannot
# delete the stack.
# Stack class owns dependencies as set of resource's
# objects, so we switch members of the resource that is
# needed to delete it.
self.resources[key].resource_id = backup_res_id
self.resources[key].properties = backup_res.properties
copy_data(backup_res, self.resources[key])
stack.resources[key].resource_id = curr_res_id
stack.resources[key].properties = curr_res.properties
copy_data(curr_res, stack.resources[key])
stack.delete(backup=True)
def _try_get_user_creds(self):
# There are cases where the user_creds cannot be returned
# due to credentials truncated when being saved to DB.
# Ignore this error instead of blocking stack deletion.
try:
return ucreds_object.UserCreds.get_by_id(self.context,
self.user_creds_id)
except exception.Error:
LOG.exception("Failed to retrieve user_creds")
return None
def _delete_credentials(self, stack_status, reason, abandon):
# Cleanup stored user_creds so they aren't accessible via
# the soft-deleted stack which remains in the DB
# The stack_status and reason passed in are current values, which
# may get rewritten and returned from this method
if self.user_creds_id:
user_creds = self._try_get_user_creds()
# If we created a trust, delete it
if user_creds is not None:
trust_id = user_creds.get('trust_id')
if trust_id:
try:
# If the trustor doesn't match the context user the
# we have to use the stored context to cleanup the
# trust, as although the user evidently has
# permission to delete the stack, they don't have
# rights to delete the trust unless an admin
trustor_id = user_creds.get('trustor_user_id')
if self.context.user_id != trustor_id:
LOG.debug("Context user_id doesn't match "
"trustor, using stored context")
sc = self.stored_context()
sc.clients.client('keystone').delete_trust(
trust_id)
else:
self.clients.client('keystone').delete_trust(
trust_id)
except Exception as ex:
# We want the admin to be able to delete the stack
# Do not FAIL a delete when we cannot delete a trust.
# We already carry through and delete the credentials
# Without this, they would need to issue
# an additional stack-delete
LOG.exception("Error deleting trust")
# Delete the stored credentials
try:
ucreds_object.UserCreds.delete(self.context,
self.user_creds_id)
except exception.NotFound:
LOG.info("Tried to delete user_creds that do not exist "
"(stack=%(stack)s user_creds_id=%(uc)s)",
{'stack': self.id, 'uc': self.user_creds_id})
try:
self.user_creds_id = None
self.store()
except exception.NotFound:
LOG.info("Tried to store a stack that does not exist %s",
self.id)
# If the stack has a domain project, delete it
if self.stack_user_project_id and not abandon:
try:
keystone = self.clients.client('keystone')
keystone.delete_stack_domain_project(
project_id=self.stack_user_project_id)
except Exception as ex:
LOG.exception("Error deleting project")
stack_status = self.FAILED
reason = "Error deleting project: %s" % six.text_type(ex)
return stack_status, reason
[docs] @profiler.trace('Stack.delete', hide_args=False)
@reset_state_on_error
def delete(self, action=DELETE, backup=False, abandon=False, notify=None):
"""Delete all of the resources, and then the stack itself.
The action parameter is used to differentiate between a user
initiated delete and an automatic stack rollback after a failed
create, which amount to the same thing, but the states are recorded
differently.
Note abandon is a delete where all resources have been set to a
RETAIN deletion policy, but we also don't want to delete anything
required for those resources, e.g the stack_user_project.
"""
if action not in (self.DELETE, self.ROLLBACK):
LOG.error("Unexpected action %s passed to delete!", action)
self.state_set(self.DELETE, self.FAILED,
"Invalid action %s" % action)
if notify is not None:
notify.signal()
return
stack_status = self.COMPLETE
reason = 'Stack %s completed successfully' % action
self.state_set(action, self.IN_PROGRESS, 'Stack %s started' %
action)
if notify is not None:
notify.signal()
backup_stack = self._backup_stack(False)
if backup_stack:
self._delete_backup_stack(backup_stack)
if backup_stack.status != backup_stack.COMPLETE:
errs = backup_stack.status_reason
failure = 'Error deleting backup resources: %s' % errs
self.state_set(action, self.FAILED,
'Failed to %s : %s' % (action, failure))
return
self.delete_all_snapshots()
if not backup:
try:
lifecycle_plugin_utils.do_pre_ops(self.context, self,
None, action)
except Exception as e:
self.state_set(action, self.FAILED,
e.args[0] if e.args else
'Failed stack pre-ops: %s' % six.text_type(e))
return
action_task = scheduler.DependencyTaskGroup(self.dependencies,
resource.Resource.destroy,
reverse=True)
try:
scheduler.TaskRunner(action_task)(timeout=self.timeout_secs())
except exception.ResourceFailure as ex:
stack_status = self.FAILED
reason = 'Resource %s failed: %s' % (action, six.text_type(ex))
except scheduler.Timeout:
stack_status = self.FAILED
reason = '%s timed out' % action.title()
# If the stack delete succeeded, this is not a backup stack and it's
# not a nested stack, we should delete the credentials
if stack_status != self.FAILED and not backup and not self.owner_id:
stack_status, reason = self._delete_credentials(stack_status,
reason,
abandon)
try:
self.state_set(action, stack_status, reason)
except exception.NotFound:
LOG.info("Tried to delete stack that does not exist "
"%s ", self.id)
if not backup:
lifecycle_plugin_utils.do_post_ops(self.context, self,
None, action,
(self.status == self.FAILED))
if stack_status != self.FAILED:
# delete the stack
try:
stack_object.Stack.delete(self.context, self.id)
except exception.NotFound:
LOG.info("Tried to delete stack that does not exist "
"%s ", self.id)
self.id = None
[docs] @profiler.trace('Stack.suspend', hide_args=False)
@reset_state_on_error
def suspend(self, notify=None):
"""Suspend the stack.
Invokes handle_suspend for all stack resources.
Waits for all resources to become SUSPEND_COMPLETE then declares the
stack SUSPEND_COMPLETE.
Note the default implementation for all resources is to do nothing
other than move to SUSPEND_COMPLETE, so the resources must implement
handle_suspend for this to have any effect.
"""
LOG.debug("Suspending stack %s", self)
# No need to suspend if the stack has been suspended
if self.state == (self.SUSPEND, self.COMPLETE):
LOG.info('%s is already suspended', self)
return
if self.convergence:
self._update_or_store_resources()
self.updated_time = oslo_timeutils.utcnow()
sus_task = scheduler.TaskRunner(
self.stack_task,
action=self.SUSPEND,
reverse=True,
notify=notify)
sus_task(timeout=self.timeout_secs())
[docs] @profiler.trace('Stack.resume', hide_args=False)
@reset_state_on_error
def resume(self, notify=None):
"""Resume the stack.
Invokes handle_resume for all stack resources.
Waits for all resources to become RESUME_COMPLETE then declares the
stack RESUME_COMPLETE.
Note the default implementation for all resources is to do nothing
other than move to RESUME_COMPLETE, so the resources must implement
handle_resume for this to have any effect.
"""
LOG.debug("Resuming stack %s", self)
# No need to resume if the stack has been resumed
if self.state == (self.RESUME, self.COMPLETE):
LOG.info('%s is already resumed', self)
return
if self.convergence:
self._update_or_store_resources()
self.updated_time = oslo_timeutils.utcnow()
sus_task = scheduler.TaskRunner(
self.stack_task,
action=self.RESUME,
reverse=False,
notify=notify)
sus_task(timeout=self.timeout_secs())
[docs] @profiler.trace('Stack.snapshot', hide_args=False)
@reset_state_on_error
def snapshot(self, save_snapshot_func):
"""Snapshot the stack, invoking handle_snapshot on all resources."""
self.updated_time = oslo_timeutils.utcnow()
sus_task = scheduler.TaskRunner(
self.stack_task,
action=self.SNAPSHOT,
reverse=False,
pre_completion_func=save_snapshot_func)
sus_task(timeout=self.timeout_secs())
[docs] def delete_all_snapshots(self):
"""Remove all snapshots for this stack."""
snapshots = snapshot_object.Snapshot.get_all(self.context, self.id)
for snapshot in snapshots:
self.delete_snapshot(snapshot)
snapshot_object.Snapshot.delete(self.context, snapshot.id)
@staticmethod
def _template_from_snapshot_data(snapshot_data):
env = environment.Environment(snapshot_data['environment'])
files = snapshot_data['files']
return tmpl.Template(snapshot_data['template'], env=env, files=files)
[docs] @profiler.trace('Stack.delete_snapshot', hide_args=False)
def delete_snapshot(self, snapshot):
"""Remove a snapshot from the backends."""
snapshot_data = snapshot.data
if snapshot_data:
template = self._template_from_snapshot_data(snapshot_data)
ss_defn = self.defn.clone_with_new_template(template,
self.identifier())
resources = self._resources_for_defn(ss_defn)
for name, rsrc in six.iteritems(resources):
data = snapshot.data['resources'].get(name)
if data:
scheduler.TaskRunner(rsrc.delete_snapshot, data)()
[docs] def restore_data(self, snapshot):
template = self._template_from_snapshot_data(snapshot.data)
newstack = self.__class__(self.context, self.name, template,
timeout_mins=self.timeout_mins,
disable_rollback=self.disable_rollback)
for name in newstack.defn.enabled_rsrc_names():
defn = newstack.defn.resource_definition(name)
rsrc = resource.Resource(name, defn, self)
data = snapshot.data['resources'].get(name)
handle_restore = getattr(rsrc, 'handle_restore', None)
if callable(handle_restore):
defn = handle_restore(defn, data)
template.add_resource(defn, name)
newstack.parameters.set_stack_id(self.identifier())
return newstack, template
[docs] @reset_state_on_error
def restore(self, snapshot, notify=None):
"""Restore the given snapshot.
Invokes handle_restore on all resources.
"""
LOG.debug("Restoring stack %s", self)
self.updated_time = oslo_timeutils.utcnow()
newstack = self.restore_data(snapshot)[0]
updater = scheduler.TaskRunner(self.update_task, newstack,
action=self.RESTORE, notify=notify)
updater()
[docs] def get_availability_zones(self):
nova = self.clients.client('nova')
if self._zones is None:
self._zones = [
zone.zoneName for zone in
nova.availability_zones.list(detailed=False)]
return self._zones
[docs] def set_stack_user_project_id(self, project_id):
self.stack_user_project_id = project_id
self.store()
[docs] @profiler.trace('Stack.create_stack_user_project_id', hide_args=False)
def create_stack_user_project_id(self):
project_id = self.clients.client(
'keystone').create_stack_domain_project(self.id)
self.set_stack_user_project_id(project_id)
[docs] @profiler.trace('Stack.prepare_abandon', hide_args=False)
def prepare_abandon(self):
return {
'name': self.name,
'id': self.id,
'action': self.action,
'environment': self.env.user_env_as_dict(),
'files': self.t.files,
'status': self.status,
'template': self.t.t,
'resources': dict((res.name, res.prepare_abandon())
for res in six.itervalues(self.resources)),
'project_id': self.tenant_id,
'stack_user_project_id': self.stack_user_project_id,
'tags': self.tags,
}
[docs] def mark_failed(self, failure_reason):
"""Mark the convergence update as failed."""
updated = self.state_set(self.action, self.FAILED, failure_reason)
if not updated:
return False
if not self.convergence:
# This function is not generally used in the legacy path, but to
# allow it to be used by any kind of stack in the
# reset_state_on_error decorator, bail out before the
# convergence-specific part in legacy stacks.
return
if (not self.disable_rollback and
self.action in (self.CREATE, self.ADOPT, self.UPDATE,
self.RESTORE)):
LOG.info("Triggering rollback of %(stack_name)s %(action)s ",
{'action': self.action, 'stack_name': self.name})
self.rollback()
else:
self.purge_db()
return True
[docs] def mark_complete(self):
"""Mark the convergence update as complete."""
LOG.info('[%(name)s(%(id)s)] update traversal %(tid)s complete',
{'name': self.name, 'id': self.id,
'tid': self.current_traversal})
reason = 'Stack %s completed successfully' % self.action
updated = self.state_set(self.action, self.COMPLETE, reason)
if not updated:
return
self.purge_db()
[docs] def purge_db(self):
"""Cleanup database after stack has completed/failed.
1. Delete the resources from DB.
2. If the stack failed, update the current_traversal to empty string
so that the resource workers bail out.
3. Delete previous raw template if stack completes successfully.
4. Deletes all sync points. They are no longer needed after stack
has completed/failed.
5. Delete the stack if the action is DELETE.
"""
resource_objects.Resource.purge_deleted(self.context, self.id)
exp_trvsl = self.current_traversal
if self.status == self.FAILED:
self.current_traversal = ''
prev_tmpl_id = None
if (self.prev_raw_template_id is not None and
self.status != self.FAILED):
prev_tmpl_id = self.prev_raw_template_id
self.prev_raw_template_id = None
stack_id = self.store(exp_trvsl=exp_trvsl)
if stack_id is None:
# Failed concurrent update
LOG.warning("Failed to store stack %(name)s with traversal ID "
"%(trvsl_id)s, aborting stack purge",
{'name': self.name,
'trvsl_id': self.current_traversal})
return
if prev_tmpl_id is not None:
raw_template_object.RawTemplate.delete(self.context, prev_tmpl_id)
sync_point.delete_all(self.context, self.id, exp_trvsl)
if (self.action, self.status) == (self.DELETE, self.COMPLETE):
if not self.owner_id:
status, reason = self._delete_credentials(
self.status,
self.status_reason,
False)
if status == self.FAILED:
# something wrong when delete credentials, set FAILED
self.state_set(self.action, status, reason)
return
try:
stack_object.Stack.delete(self.context, self.id)
except exception.NotFound:
pass
[docs] def time_elapsed(self):
"""Time elapsed in seconds since the stack operation started."""
start_time = self.updated_time or self.created_time
return (oslo_timeutils.utcnow() - start_time).total_seconds()
[docs] def time_remaining(self):
"""Time left before stack times out."""
return self.timeout_secs() - self.time_elapsed()
[docs] def has_timed_out(self):
"""Returns True if this stack has timed-out."""
if self.status == self.IN_PROGRESS:
return self.time_elapsed() > self.timeout_secs()
return False
[docs] def migrate_to_convergence(self):
db_rsrcs = self.db_active_resources_get()
res_id_dep = self.dependencies.translate(lambda res: res.id)
current_template_id = self.t.id
if db_rsrcs is not None:
for db_res in db_rsrcs.values():
requires = set(res_id_dep.requires(db_res.id))
r = self.resources.get(db_res.name)
if r is None:
# delete db resources not in current_template_id
LOG.warning("Resource %(res)s not found in template "
"for stack %(st)s, deleting from db.",
{'res': db_res.name, 'st': self.id})
resource_objects.Resource.delete(self.context, db_res.id)
else:
r.requires = requires
db_res.convert_to_convergence(current_template_id,
requires)
self.current_traversal = uuidutils.generate_uuid()
self.convergence = True
prev_raw_template_id = self.prev_raw_template_id
self.prev_raw_template_id = None
self.store(ignore_traversal_check=True)
if prev_raw_template_id:
raw_template_object.RawTemplate.delete(self.context,
prev_raw_template_id)
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