737 lines
27 KiB
Python
737 lines
27 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import collections
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import copy
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import functools
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import re
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import six
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from oslo.config import cfg
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from heat.engine import environment
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from heat.common import exception
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from heat.engine import dependencies
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from heat.common import identifier
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from heat.engine import notification
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from heat.engine import resource
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from heat.engine import resources
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from heat.engine import scheduler
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from heat.engine import template
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from heat.engine import timestamp
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from heat.engine import update
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from heat.engine.parameters import Parameters
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from heat.engine.template import Template
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from heat.engine.clients import Clients
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from heat.db import api as db_api
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from heat.openstack.common import log as logging
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from heat.openstack.common.gettextutils import _
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from heat.openstack.common import strutils
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from heat.common.exception import StackValidationFailed
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logger = logging.getLogger(__name__)
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(PARAM_STACK_NAME, PARAM_REGION) = ('AWS::StackName', 'AWS::Region')
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class Stack(collections.Mapping):
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ACTIONS = (CREATE, DELETE, UPDATE, ROLLBACK, SUSPEND, RESUME
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) = ('CREATE', 'DELETE', 'UPDATE', 'ROLLBACK', 'SUSPEND',
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'RESUME')
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STATUSES = (IN_PROGRESS, FAILED, COMPLETE
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) = ('IN_PROGRESS', 'FAILED', 'COMPLETE')
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created_time = timestamp.Timestamp(functools.partial(db_api.stack_get,
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show_deleted=True),
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'created_at')
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updated_time = timestamp.Timestamp(functools.partial(db_api.stack_get,
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show_deleted=True),
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'updated_at')
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_zones = None
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def __init__(self, context, stack_name, tmpl, env=None,
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stack_id=None, action=None, status=None,
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status_reason='', timeout_mins=60, resolve_data=True,
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disable_rollback=True, parent_resource=None, owner_id=None):
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'''
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Initialise from a context, name, Template object and (optionally)
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Environment object. The database ID may also be initialised, if the
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stack is already in the database.
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'''
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if owner_id is None:
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if re.match("[a-zA-Z][a-zA-Z0-9_.-]*$", stack_name) is None:
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raise ValueError(_('Invalid stack name %s'
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' must contain only alphanumeric or '
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'\"_-.\" characters, must start with alpha'
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) % stack_name)
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self.id = stack_id
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self.owner_id = owner_id
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self.context = context
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self.clients = Clients(context)
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self.t = tmpl
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self.name = stack_name
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self.action = action
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self.status = status
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self.status_reason = status_reason
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self.timeout_mins = timeout_mins
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self.disable_rollback = disable_rollback
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self.parent_resource = parent_resource
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self._resources = None
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self._dependencies = None
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resources.initialise()
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self.env = env or environment.Environment({})
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self.parameters = Parameters(self.name, self.t,
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user_params=self.env.params)
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self._set_param_stackid()
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if resolve_data:
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self.outputs = self.resolve_static_data(self.t[template.OUTPUTS])
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else:
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self.outputs = {}
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@property
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def resources(self):
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if self._resources is None:
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template_resources = self.t[template.RESOURCES]
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self._resources = dict((name, resource.Resource(name, data, self))
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for (name, data) in
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template_resources.items())
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return self._resources
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@property
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def dependencies(self):
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if self._dependencies is None:
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self._dependencies = self._get_dependencies(
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self.resources.itervalues())
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return self._dependencies
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def reset_dependencies(self):
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self._dependencies = None
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@property
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def root_stack(self):
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'''
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Return the root stack if this is nested (otherwise return self).
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'''
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if (self.parent_resource and self.parent_resource.stack):
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return self.parent_resource.stack.root_stack
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return self
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def total_resources(self):
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'''
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Return the total number of resources in a stack, including nested
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stacks below.
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'''
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def total_nested(res):
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get_nested = getattr(res, 'nested', None)
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if callable(get_nested):
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nested_stack = get_nested()
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if nested_stack is not None:
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return nested_stack.total_resources()
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return 0
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return len(self) + sum(total_nested(res) for res in self.itervalues())
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def _set_param_stackid(self):
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'''
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Update self.parameters with the current ARN which is then provided
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via the Parameters class as the AWS::StackId pseudo parameter
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'''
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# This can fail if constructor called without a valid context,
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# as it is in many tests
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try:
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stack_arn = self.identifier().arn()
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except (AttributeError, ValueError, TypeError):
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logger.warning(_("Unable to set parameters StackId identifier"))
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else:
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self.parameters.set_stack_id(stack_arn)
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@staticmethod
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def _get_dependencies(resources):
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'''Return the dependency graph for a list of resources.'''
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deps = dependencies.Dependencies()
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for resource in resources:
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resource.add_dependencies(deps)
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return deps
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@classmethod
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def load(cls, context, stack_id=None, stack=None, resolve_data=True,
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parent_resource=None, show_deleted=True):
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'''Retrieve a Stack from the database.'''
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if stack is None:
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stack = db_api.stack_get(context, stack_id,
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show_deleted=show_deleted)
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if stack is None:
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message = _('No stack exists with id "%s"') % str(stack_id)
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raise exception.NotFound(message)
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template = Template.load(context, stack.raw_template_id)
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env = environment.Environment(stack.parameters)
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stack = cls(context, stack.name, template, env,
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stack.id, stack.action, stack.status, stack.status_reason,
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stack.timeout, resolve_data, stack.disable_rollback,
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parent_resource, owner_id=stack.owner_id)
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return stack
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def store(self, backup=False):
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'''
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Store the stack in the database and return its ID
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If self.id is set, we update the existing stack
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'''
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s = {
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'name': self._backup_name() if backup else self.name,
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'raw_template_id': self.t.store(self.context),
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'parameters': self.env.user_env_as_dict(),
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'owner_id': self.owner_id,
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'username': self.context.username,
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'tenant': self.context.tenant_id,
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'action': self.action,
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'status': self.status,
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'status_reason': self.status_reason,
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'timeout': self.timeout_mins,
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'disable_rollback': self.disable_rollback,
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}
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if self.id:
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db_api.stack_update(self.context, self.id, s)
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else:
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# Create a context containing a trust_id and trustor_user_id
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# if trusts are enabled
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if cfg.CONF.deferred_auth_method == 'trusts':
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trust_context = self.clients.keystone().create_trust_context()
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new_creds = db_api.user_creds_create(trust_context)
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else:
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new_creds = db_api.user_creds_create(self.context)
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s['user_creds_id'] = new_creds.id
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new_s = db_api.stack_create(self.context, s)
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self.id = new_s.id
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self._set_param_stackid()
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return self.id
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def _backup_name(self):
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return '%s*' % self.name
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def identifier(self):
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'''
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Return an identifier for this stack.
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'''
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return identifier.HeatIdentifier(self.context.tenant_id,
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self.name, self.id)
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def __iter__(self):
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'''
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Return an iterator over the resource names.
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'''
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return iter(self.resources)
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def __len__(self):
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'''Return the number of resources.'''
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return len(self.resources)
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def __getitem__(self, key):
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'''Get the resource with the specified name.'''
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return self.resources[key]
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def __setitem__(self, key, resource):
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'''Set the resource with the specified name to a specific value.'''
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resource.stack = self
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self.resources[key] = resource
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def __delitem__(self, key):
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'''Remove the resource with the specified name.'''
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del self.resources[key]
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def __contains__(self, key):
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'''Determine whether the stack contains the specified resource.'''
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return key in self.resources
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def __eq__(self, other):
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'''
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Compare two Stacks for equality.
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Stacks are considered equal only if they are identical.
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'''
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return self is other
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def __str__(self):
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'''Return a human-readable string representation of the stack.'''
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return 'Stack "%s"' % self.name
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def resource_by_refid(self, refid):
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'''
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Return the resource in this stack with the specified
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refid, or None if not found
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'''
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for r in self.values():
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if r.state in (
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(r.CREATE, r.IN_PROGRESS),
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(r.CREATE, r.COMPLETE),
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(r.RESUME, r.IN_PROGRESS),
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(r.RESUME, r.COMPLETE),
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(r.UPDATE, r.IN_PROGRESS),
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(r.UPDATE, r.COMPLETE)) and r.FnGetRefId() == refid:
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return r
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def validate(self):
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'''
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Validates the template.
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'''
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# TODO(sdake) Should return line number of invalid reference
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# Check duplicate names between parameters and resources
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dup_names = set(self.parameters.keys()) & set(self.keys())
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if dup_names:
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logger.debug(_("Duplicate names %s") % dup_names)
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raise StackValidationFailed(message=_("Duplicate names %s") %
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dup_names)
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for res in self.dependencies:
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try:
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result = res.validate()
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except exception.Error as ex:
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logger.exception(ex)
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raise ex
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except Exception as ex:
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logger.exception(ex)
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raise StackValidationFailed(message=strutils.safe_decode(
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six.text_type(ex)))
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if result:
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raise StackValidationFailed(message=result)
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def requires_deferred_auth(self):
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'''
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Returns whether this stack may need to perform API requests
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during its lifecycle using the configured deferred authentication
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method.
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'''
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return any(res.requires_deferred_auth for res in self.values())
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def state_set(self, action, status, reason):
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'''Update the stack state in the database.'''
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if action not in self.ACTIONS:
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raise ValueError(_("Invalid action %s") % action)
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if status not in self.STATUSES:
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raise ValueError(_("Invalid status %s") % status)
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self.action = action
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self.status = status
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self.status_reason = reason
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if self.id is None:
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return
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stack = db_api.stack_get(self.context, self.id)
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stack.update_and_save({'action': action,
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'status': status,
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'status_reason': reason})
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notification.send(self)
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@property
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def state(self):
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'''Returns state, tuple of action, status.'''
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return (self.action, self.status)
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def timeout_secs(self):
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'''
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Return the stack creation timeout in seconds, or None if no timeout
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should be used.
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'''
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if self.timeout_mins is None:
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return None
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return self.timeout_mins * 60
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def create(self):
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'''
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Create the stack and all of the resources.
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'''
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def rollback():
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if not self.disable_rollback and self.state == (self.CREATE,
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self.FAILED):
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self.delete(action=self.ROLLBACK)
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creator = scheduler.TaskRunner(self.stack_task,
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action=self.CREATE,
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reverse=False,
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post_func=rollback)
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creator(timeout=self.timeout_secs())
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@scheduler.wrappertask
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def stack_task(self, action, reverse=False, post_func=None):
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'''
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A task to perform an action on the stack and all of the resources
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in forward or reverse dependency order as specfifed by reverse
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'''
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self.state_set(action, self.IN_PROGRESS,
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'Stack %s started' % action)
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stack_status = self.COMPLETE
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reason = 'Stack %s completed successfully' % action.lower()
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def resource_action(r):
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# Find e.g resource.create and call it
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action_l = action.lower()
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handle = getattr(r, '%s' % action_l)
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return handle()
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action_task = scheduler.DependencyTaskGroup(self.dependencies,
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resource_action,
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reverse)
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try:
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yield action_task()
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except exception.ResourceFailure as ex:
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stack_status = self.FAILED
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reason = 'Resource %s failed: %s' % (action.lower(), str(ex))
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except scheduler.Timeout:
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stack_status = self.FAILED
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reason = '%s timed out' % action.title()
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self.state_set(action, stack_status, reason)
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if callable(post_func):
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post_func()
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def _backup_stack(self, create_if_missing=True):
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'''
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Get a Stack containing any in-progress resources from the previous
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stack state prior to an update.
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'''
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s = db_api.stack_get_by_name_and_owner_id(self.context,
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self._backup_name(),
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owner_id=self.id)
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if s is not None:
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logger.debug(_('Loaded existing backup stack'))
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return self.load(self.context, stack=s)
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elif create_if_missing:
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templ = Template.load(self.context, self.t.id)
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templ.files = copy.deepcopy(self.t.files)
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prev = type(self)(self.context, self.name, templ, self.env,
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owner_id=self.id)
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prev.store(backup=True)
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logger.debug(_('Created new backup stack'))
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return prev
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else:
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return None
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def update(self, newstack):
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'''
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Compare the current stack with newstack,
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and where necessary create/update/delete the resources until
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this stack aligns with newstack.
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Note update of existing stack resources depends on update
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being implemented in the underlying resource types
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Update will fail if it exceeds the specified timeout. The default is
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60 minutes, set in the constructor
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'''
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updater = scheduler.TaskRunner(self.update_task, newstack)
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updater()
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@scheduler.wrappertask
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def update_task(self, newstack, action=UPDATE):
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if action not in (self.UPDATE, self.ROLLBACK):
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logger.error(_("Unexpected action %s passed to update!") % action)
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self.state_set(self.UPDATE, self.FAILED,
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"Invalid action %s" % action)
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return
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if self.status != self.COMPLETE:
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if (action == self.ROLLBACK and
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self.state == (self.UPDATE, self.IN_PROGRESS)):
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logger.debug(_("Starting update rollback for %s") % self.name)
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else:
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self.state_set(action, self.FAILED,
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'State invalid for %s' % action)
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return
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self.state_set(self.UPDATE, self.IN_PROGRESS,
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'Stack %s started' % action)
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oldstack = Stack(self.context, self.name, self.t, self.env)
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backup_stack = self._backup_stack()
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try:
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update_task = update.StackUpdate(self, newstack, backup_stack,
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rollback=action == self.ROLLBACK)
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updater = scheduler.TaskRunner(update_task)
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self.env = newstack.env
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self.parameters = newstack.parameters
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self.t.files = newstack.t.files
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self._set_param_stackid()
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try:
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updater.start(timeout=self.timeout_secs())
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yield
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while not updater.step():
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yield
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finally:
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self.reset_dependencies()
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if action == self.UPDATE:
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reason = 'Stack successfully updated'
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else:
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reason = 'Stack rollback completed'
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stack_status = self.COMPLETE
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except scheduler.Timeout:
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stack_status = self.FAILED
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reason = 'Timed out'
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except exception.ResourceFailure as e:
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reason = str(e)
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stack_status = self.FAILED
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if action == self.UPDATE:
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# If rollback is enabled, we do another update, with the
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# existing template, so we roll back to the original state
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if not self.disable_rollback:
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yield self.update_task(oldstack, action=self.ROLLBACK)
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return
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else:
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logger.debug(_('Deleting backup stack'))
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backup_stack.delete()
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self.state_set(action, stack_status, reason)
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# flip the template to the newstack values
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# Note we do this on success and failure, so the current
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# stack resources are stored, even if one is in a failed
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# state (otherwise we won't remove them on delete)
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self.t = newstack.t
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template_outputs = self.t[template.OUTPUTS]
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self.outputs = self.resolve_static_data(template_outputs)
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self.store()
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def delete(self, action=DELETE):
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'''
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Delete all of the resources, and then the stack itself.
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The action parameter is used to differentiate between a user
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initiated delete and an automatic stack rollback after a failed
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create, which amount to the same thing, but the states are recorded
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differently.
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'''
|
|
if action not in (self.DELETE, self.ROLLBACK):
|
|
logger.error(_("Unexpected action %s passed to delete!") % action)
|
|
self.state_set(self.DELETE, self.FAILED,
|
|
"Invalid action %s" % action)
|
|
return
|
|
|
|
stack_status = self.COMPLETE
|
|
reason = 'Stack %s completed successfully' % action.lower()
|
|
self.state_set(action, self.IN_PROGRESS, 'Stack %s started' % action)
|
|
|
|
backup_stack = self._backup_stack(False)
|
|
if backup_stack is not None:
|
|
backup_stack.delete()
|
|
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
|
|
|
|
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.lower(), str(ex))
|
|
except scheduler.Timeout:
|
|
stack_status = self.FAILED
|
|
reason = '%s timed out' % action.title()
|
|
|
|
if stack_status != self.FAILED:
|
|
# If we created a trust, delete it
|
|
stack = db_api.stack_get(self.context, self.id)
|
|
user_creds = db_api.user_creds_get(stack.user_creds_id)
|
|
trust_id = user_creds.get('trust_id')
|
|
if trust_id:
|
|
try:
|
|
self.clients.keystone().delete_trust(trust_id)
|
|
except Exception as ex:
|
|
logger.exception(ex)
|
|
stack_status = self.FAILED
|
|
reason = "Error deleting trust: %s" % str(ex)
|
|
|
|
self.state_set(action, stack_status, reason)
|
|
|
|
if stack_status != self.FAILED:
|
|
# delete the stack
|
|
db_api.stack_delete(self.context, self.id)
|
|
self.id = None
|
|
|
|
def suspend(self):
|
|
'''
|
|
Suspend the stack, which 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.
|
|
'''
|
|
sus_task = scheduler.TaskRunner(self.stack_task,
|
|
action=self.SUSPEND,
|
|
reverse=True)
|
|
sus_task(timeout=self.timeout_secs())
|
|
|
|
def resume(self):
|
|
'''
|
|
Resume the stack, which 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.
|
|
'''
|
|
sus_task = scheduler.TaskRunner(self.stack_task,
|
|
action=self.RESUME,
|
|
reverse=False)
|
|
sus_task(timeout=self.timeout_secs())
|
|
|
|
def output(self, key):
|
|
'''
|
|
Get the value of the specified stack output.
|
|
'''
|
|
value = self.outputs[key].get('Value', '')
|
|
return self.resolve_runtime_data(value)
|
|
|
|
def restart_resource(self, resource_name):
|
|
'''
|
|
stop resource_name and all that depend on it
|
|
start resource_name and all that depend on it
|
|
'''
|
|
deps = self.dependencies[self[resource_name]]
|
|
failed = False
|
|
|
|
for res in reversed(deps):
|
|
try:
|
|
scheduler.TaskRunner(res.destroy)()
|
|
except exception.ResourceFailure as ex:
|
|
failed = True
|
|
logger.error(_('delete: %s') % str(ex))
|
|
|
|
for res in deps:
|
|
if not failed:
|
|
try:
|
|
res.state_reset()
|
|
scheduler.TaskRunner(res.create)()
|
|
except exception.ResourceFailure as ex:
|
|
logger.exception(_('create'))
|
|
failed = True
|
|
else:
|
|
res.state_set(res.CREATE, res.FAILED,
|
|
'Resource restart aborted')
|
|
# TODO(asalkeld) if any of this fails we Should
|
|
# restart the whole stack
|
|
|
|
def get_availability_zones(self):
|
|
if self._zones is None:
|
|
self._zones = [
|
|
zone.zoneName for zone in
|
|
self.clients.nova().availability_zones.list(detailed=False)]
|
|
return self._zones
|
|
|
|
def set_deletion_policy(self, policy):
|
|
for res in self.resources.values():
|
|
res.set_deletion_policy(policy)
|
|
|
|
def get_abandon_data(self):
|
|
return {
|
|
'name': self.name,
|
|
'id': self.id,
|
|
'action': self.action,
|
|
'status': self.status,
|
|
'template': self.t.t,
|
|
'resources': dict((res.name, res.get_abandon_data())
|
|
for res in self.resources.values())
|
|
}
|
|
|
|
def resolve_static_data(self, snippet):
|
|
return resolve_static_data(self.t, self, self.parameters, snippet)
|
|
|
|
def resolve_runtime_data(self, snippet):
|
|
return resolve_runtime_data(self.t, self.resources, snippet)
|
|
|
|
|
|
def resolve_static_data(template, stack, parameters, snippet):
|
|
'''
|
|
Resolve static parameters, map lookups, etc. in a template.
|
|
|
|
Example:
|
|
|
|
>>> from heat.common import template_format
|
|
>>> template_str = '# JSON or YAML encoded template'
|
|
>>> template = Template(template_format.parse(template_str))
|
|
>>> parameters = Parameters('stack', template, {'KeyName': 'my_key'})
|
|
>>> resolve_static_data(template, None, parameters, {'Ref': 'KeyName'})
|
|
'my_key'
|
|
'''
|
|
return transform(snippet,
|
|
[functools.partial(template.resolve_param_refs,
|
|
parameters=parameters),
|
|
functools.partial(template.resolve_availability_zones,
|
|
stack=stack),
|
|
functools.partial(template.resolve_resource_facade,
|
|
stack=stack),
|
|
template.resolve_find_in_map,
|
|
template.reduce_joins])
|
|
|
|
|
|
def resolve_runtime_data(template, resources, snippet):
|
|
return transform(snippet,
|
|
[functools.partial(template.resolve_resource_refs,
|
|
resources=resources),
|
|
functools.partial(template.resolve_attributes,
|
|
resources=resources),
|
|
template.resolve_split,
|
|
template.resolve_member_list_to_map,
|
|
template.resolve_select,
|
|
template.resolve_joins,
|
|
template.resolve_replace,
|
|
template.resolve_base64])
|
|
|
|
|
|
def transform(data, transformations):
|
|
'''
|
|
Apply each of the transformation functions in the supplied list to the data
|
|
in turn.
|
|
'''
|
|
def sub_transform(d):
|
|
return transform(d, transformations)
|
|
|
|
for t in transformations:
|
|
data = t(data, transform=sub_transform)
|
|
return data
|