345 lines
14 KiB
Python
345 lines
14 KiB
Python
# Copyright (c) 2016 Hewlett-Packard Development Company, L.P.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import six
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from oslo_log import log as logging
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from heat.common import exception
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from heat.common.i18n import _LI
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from heat.engine import resource
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from heat.engine import scheduler
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from heat.engine import stack as parser
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from heat.engine import sync_point
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from heat.objects import resource as resource_objects
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from heat.rpc import listener_client
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LOG = logging.getLogger(__name__)
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class CheckResource(object):
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def __init__(self,
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engine_id,
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rpc_client,
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thread_group_mgr):
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self.engine_id = engine_id
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self._rpc_client = rpc_client
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self.thread_group_mgr = thread_group_mgr
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def _try_steal_engine_lock(self, cnxt, resource_id):
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rs_obj = resource_objects.Resource.get_obj(cnxt,
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resource_id)
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if rs_obj.engine_id not in (None, self.engine_id):
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if not listener_client.EngineListenerClient(
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rs_obj.engine_id).is_alive(cnxt):
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# steal the lock.
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rs_obj.update_and_save({'engine_id': None})
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return True
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return False
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def _trigger_rollback(self, stack):
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LOG.info(_LI("Triggering rollback of %(stack_name)s %(action)s "),
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{'action': stack.action, 'stack_name': stack.name})
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stack.rollback()
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def _handle_failure(self, cnxt, stack, failure_reason):
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updated = stack.state_set(stack.action, stack.FAILED, failure_reason)
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if not updated:
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return False
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if (not stack.disable_rollback and
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stack.action in (stack.CREATE, stack.ADOPT, stack.UPDATE)):
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self._trigger_rollback(stack)
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else:
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stack.purge_db()
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return True
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def _handle_resource_failure(self, cnxt, is_update, rsrc_id,
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stack, failure_reason):
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failure_handled = self._handle_failure(cnxt, stack, failure_reason)
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if not failure_handled:
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# Another concurrent update has taken over. But there is a
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# possibility for that update to be waiting for this rsrc to
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# complete, hence retrigger current rsrc for latest traversal.
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traversal = stack.current_traversal
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latest_stack = parser.Stack.load(cnxt, stack_id=stack.id)
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if traversal != latest_stack.current_traversal:
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self._retrigger_check_resource(cnxt, is_update, rsrc_id,
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latest_stack)
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def _handle_stack_timeout(self, cnxt, stack):
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failure_reason = u'Timed out'
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self._handle_failure(cnxt, stack, failure_reason)
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def _do_check_resource(self, cnxt, current_traversal, tmpl, resource_data,
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is_update, rsrc, stack, adopt_stack_data):
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try:
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if is_update:
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try:
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check_resource_update(rsrc, tmpl.id, resource_data,
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self.engine_id,
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stack)
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except exception.UpdateReplace:
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new_res_id = rsrc.make_replacement(tmpl.id)
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LOG.info("Replacing resource with new id %s", new_res_id)
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rpc_data = sync_point.serialize_input_data(resource_data)
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self._rpc_client.check_resource(cnxt,
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new_res_id,
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current_traversal,
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rpc_data, is_update,
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adopt_stack_data)
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return False
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else:
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check_resource_cleanup(rsrc, tmpl.id, resource_data,
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self.engine_id, stack.time_remaining())
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return True
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except exception.UpdateInProgress:
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if self._try_steal_engine_lock(cnxt, rsrc.id):
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rpc_data = sync_point.serialize_input_data(resource_data)
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# set the resource state as failed
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status_reason = ('Worker went down '
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'during resource %s' % rsrc.action)
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rsrc.state_set(rsrc.action,
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rsrc.FAILED,
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six.text_type(status_reason))
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self._rpc_client.check_resource(cnxt,
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rsrc.id,
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current_traversal,
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rpc_data, is_update,
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adopt_stack_data)
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except exception.ResourceFailure as ex:
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action = ex.action or rsrc.action
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reason = 'Resource %s failed: %s' % (action,
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six.text_type(ex))
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self._handle_resource_failure(cnxt, is_update, rsrc.id,
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stack, reason)
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except scheduler.Timeout:
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# reload the stack to verify current traversal
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stack = parser.Stack.load(cnxt, stack_id=stack.id)
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if stack.current_traversal != current_traversal:
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return
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self._handle_stack_timeout(cnxt, stack)
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return False
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def _retrigger_check_resource(self, cnxt, is_update, resource_id, stack):
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current_traversal = stack.current_traversal
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graph = stack.convergence_dependencies.graph()
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key = (resource_id, is_update)
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if is_update:
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# When re-triggering for a rsrc, we need to first check if update
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# traversal is present for the rsrc in latest stack traversal,
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# if No, then latest traversal is waiting for delete.
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if (resource_id, is_update) not in graph:
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key = (resource_id, not is_update)
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LOG.info('Re-trigger resource: (%s, %s)' % (key[0], key[1]))
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predecessors = set(graph[key])
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try:
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propagate_check_resource(cnxt, self._rpc_client, resource_id,
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current_traversal, predecessors, key,
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None, key[1], None)
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except exception.EntityNotFound as e:
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if e.entity != "Sync Point":
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raise
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def _initiate_propagate_resource(self, cnxt, resource_id,
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current_traversal, is_update, rsrc,
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stack):
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deps = stack.convergence_dependencies
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graph = deps.graph()
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graph_key = (resource_id, is_update)
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if graph_key not in graph and rsrc.replaces is not None:
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# If we are a replacement, impersonate the replaced resource for
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# the purposes of calculating whether subsequent resources are
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# ready, since everybody has to work from the same version of the
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# graph. Our real resource ID is sent in the input_data, so the
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# dependencies will get updated to point to this resource in time
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# for the next traversal.
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graph_key = (rsrc.replaces, is_update)
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def _get_input_data(req, fwd):
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if fwd:
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return construct_input_data(rsrc, stack)
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else:
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# Don't send data if initiating clean-up for self i.e.
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# initiating delete of a replaced resource
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if req not in graph_key:
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# send replaced resource as needed_by if it exists
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return (rsrc.replaced_by
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if rsrc.replaced_by is not None
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else resource_id)
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return None
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try:
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for req, fwd in deps.required_by(graph_key):
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input_data = _get_input_data(req, fwd)
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propagate_check_resource(
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cnxt, self._rpc_client, req, current_traversal,
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set(graph[(req, fwd)]), graph_key, input_data, fwd,
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stack.adopt_stack_data)
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check_stack_complete(cnxt, stack, current_traversal,
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resource_id, deps, is_update)
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except exception.EntityNotFound as e:
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if e.entity == "Sync Point":
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# Reload the stack to determine the current traversal, and
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# check the SyncPoint for the current node to determine if
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# it is ready. If it is, then retrigger the current node
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# with the appropriate data for the latest traversal.
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stack = parser.Stack.load(cnxt, stack_id=rsrc.stack.id)
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if current_traversal == stack.current_traversal:
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LOG.debug('[%s] Traversal sync point missing.',
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current_traversal)
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return
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self._retrigger_check_resource(cnxt, is_update,
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resource_id, stack)
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else:
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raise
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def check(self, cnxt, resource_id, current_traversal,
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resource_data, is_update, adopt_stack_data,
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rsrc, stack):
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"""Process a node in the dependency graph.
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The node may be associated with either an update or a cleanup of its
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associated resource.
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"""
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if stack.has_timed_out():
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self._handle_stack_timeout(cnxt, stack)
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return
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tmpl = stack.t
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stack.adopt_stack_data = adopt_stack_data
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stack.thread_group_mgr = self.thread_group_mgr
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if is_update:
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if (rsrc.replaced_by is not None and
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rsrc.current_template_id != tmpl.id):
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return
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check_resource_done = self._do_check_resource(cnxt, current_traversal,
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tmpl, resource_data,
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is_update,
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rsrc, stack,
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adopt_stack_data)
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if check_resource_done:
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# initiate check on next set of resources from graph
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self._initiate_propagate_resource(cnxt, resource_id,
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current_traversal, is_update,
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rsrc, stack)
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def load_resource(cnxt, resource_id, resource_data, is_update):
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if is_update:
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cache_data = {in_data.get(
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'name'): in_data for in_data in resource_data.values()
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if in_data is not None}
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else:
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# no data to resolve in cleanup phase
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cache_data = {}
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try:
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return resource.Resource.load(cnxt, resource_id,
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is_update, cache_data)
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except (exception.ResourceNotFound, exception.NotFound):
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# can be ignored
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return None, None, None
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def _resolve_attributes(dep_attrs, rsrc):
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resolved_attributes = {}
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for attr in dep_attrs:
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try:
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if isinstance(attr, six.string_types):
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resolved_attributes[attr] = rsrc.get_attribute(attr)
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else:
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resolved_attributes[attr] = rsrc.get_attribute(*attr)
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except exception.InvalidTemplateAttribute as ita:
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LOG.info(six.text_type(ita))
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return resolved_attributes
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def construct_input_data(rsrc, curr_stack):
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dep_attrs = curr_stack.get_dep_attrs(
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six.itervalues(curr_stack.resources),
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curr_stack.outputs,
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rsrc.name,
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curr_stack.t.OUTPUT_VALUE)
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input_data = {'id': rsrc.id,
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'name': rsrc.name,
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'reference_id': rsrc.get_reference_id(),
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'attrs': _resolve_attributes(dep_attrs, rsrc),
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'status': rsrc.status,
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'action': rsrc.action,
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'uuid': rsrc.uuid}
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return input_data
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def check_stack_complete(cnxt, stack, current_traversal, sender_id, deps,
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is_update):
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"""Mark the stack complete if the update is complete.
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Complete is currently in the sense that all desired resources are in
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service, not that superfluous ones have been cleaned up.
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"""
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roots = set(deps.roots())
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if (sender_id, is_update) not in roots:
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return
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def mark_complete(stack_id, data):
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stack.mark_complete()
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sender_key = (sender_id, is_update)
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sync_point.sync(cnxt, stack.id, current_traversal, True,
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mark_complete, roots, {sender_key: None})
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def propagate_check_resource(cnxt, rpc_client, next_res_id,
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current_traversal, predecessors, sender_key,
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sender_data, is_update, adopt_stack_data):
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"""Trigger processing of node if all of its dependencies are satisfied."""
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def do_check(entity_id, data):
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rpc_client.check_resource(cnxt, entity_id, current_traversal,
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data, is_update, adopt_stack_data)
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sync_point.sync(cnxt, next_res_id, current_traversal,
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is_update, do_check, predecessors,
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{sender_key: sender_data})
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def check_resource_update(rsrc, template_id, resource_data, engine_id,
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stack):
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"""Create or update the Resource if appropriate."""
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if rsrc.action == resource.Resource.INIT:
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rsrc.create_convergence(template_id, resource_data, engine_id,
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stack.time_remaining())
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else:
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rsrc.update_convergence(template_id, resource_data, engine_id,
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stack.time_remaining(), stack)
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def check_resource_cleanup(rsrc, template_id, resource_data, engine_id,
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timeout):
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"""Delete the Resource if appropriate."""
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rsrc.delete_convergence(template_id, resource_data, engine_id, timeout)
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