225 lines
7.6 KiB
Python
225 lines
7.6 KiB
Python
# Copyright (c) 2014 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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from oslo_log import log as logging
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import oslo_messaging
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from osprofiler import profiler
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import six
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from heat.common import context
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from heat.common import exception
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from heat.common.i18n import _LE
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from heat.common.i18n import _LI
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from heat.common import messaging as rpc_messaging
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from heat.engine import dependencies
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from heat.engine import resource
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from heat.engine import sync_point
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from heat.openstack.common import service
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from heat.rpc import worker_client as rpc_client
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LOG = logging.getLogger(__name__)
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@profiler.trace_cls("rpc")
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class WorkerService(service.Service):
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"""
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This service is dedicated to handle internal messages to the 'worker'
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(a.k.a. 'converger') actor in convergence. Messages on this bus will
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use the 'cast' rather than 'call' method to anycast the message to
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an engine that will handle it asynchronously. It won't wait for
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or expect replies from these messages.
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"""
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RPC_API_VERSION = '1.1'
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def __init__(self,
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host,
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topic,
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engine_id,
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thread_group_mgr):
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super(WorkerService, self).__init__()
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self.host = host
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self.topic = topic
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self.engine_id = engine_id
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self.thread_group_mgr = thread_group_mgr
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self._rpc_client = None
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self._rpc_server = None
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def start(self):
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target = oslo_messaging.Target(
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version=self.RPC_API_VERSION,
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server=self.host,
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topic=self.topic)
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LOG.info(_LI("Starting WorkerService ..."))
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self._rpc_server = rpc_messaging.get_rpc_server(target, self)
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self._rpc_server.start()
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self._rpc_client = rpc_client.WorkerClient()
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super(WorkerService, self).start()
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def stop(self):
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# Stop rpc connection at first for preventing new requests
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LOG.info(_LI("Stopping WorkerService ..."))
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try:
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self._rpc_server.stop()
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self._rpc_server.wait()
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except Exception as e:
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LOG.error(_LE("WorkerService is failed to stop, %s"), e)
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super(WorkerService, self).stop()
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@context.request_context
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def check_resource(self, cnxt, resource_id, current_traversal, data,
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is_update):
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'''
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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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try:
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rsrc, stack = resource.Resource.load(cnxt, resource_id, data)
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except exception.NotFound:
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return
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tmpl = stack.t
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if current_traversal != rsrc.stack.current_traversal:
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LOG.debug('[%s] Traversal cancelled; stopping.', current_traversal)
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return
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current_deps = ([tuple(i), (tuple(j) if j is not None else None)]
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for i, j in rsrc.stack.current_deps['edges'])
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deps = dependencies.Dependencies(edges=current_deps)
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graph = deps.graph()
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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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try:
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check_resource_update(rsrc, tmpl.id, data)
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except resource.UpdateReplace:
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# NOTE(sirushtim): Implemented by spec
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# convergence-resource-replacement.
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rsrc.make_replacement()
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return
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except resource.UpdateInProgress:
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return
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input_data = construct_input_data(rsrc)
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else:
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try:
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check_resource_cleanup(rsrc, tmpl.id, data)
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except resource.UpdateInProgress:
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return
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graph_key = (rsrc.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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try:
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for req, fwd in deps.required_by(graph_key):
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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,
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input_data if fwd else rsrc.id, fwd)
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check_stack_complete(cnxt, rsrc.stack, current_traversal,
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rsrc.id, graph, is_update)
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except sync_point.SyncPointNotFound:
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# NOTE(sirushtim): Implemented by spec
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# convergence-concurrent-workflow
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pass
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def construct_input_data(rsrc):
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attributes = rsrc.stack.get_dep_attrs(
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six.itervalues(rsrc.stack.resources),
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rsrc.stack.outputs,
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rsrc.name)
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resolved_attributes = {attr: rsrc.FnGetAtt(attr) for attr in attributes}
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input_data = {'id': rsrc.id,
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'name': rsrc.name,
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'physical_resource_id': rsrc.resource_id,
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'attrs': resolved_attributes}
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return input_data
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def check_stack_complete(cnxt, stack, current_traversal, sender, graph,
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is_update):
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'''
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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(key for (key, fwd), node in graph.items()
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if not any(f for k, f in node.required_by()))
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if sender 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(current_traversal)
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sync_point.sync(cnxt, stack.id, current_traversal, is_update,
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mark_complete, roots, {sender: None})
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def propagate_check_resource(cnxt, rpc_client, next_res_id,
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current_traversal, predecessors, sender,
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sender_data, is_update):
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'''
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Trigger processing of a node if all of its dependencies are satisfied.
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'''
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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)
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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: sender_data})
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def check_resource_update(rsrc, template_id, data):
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'''
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Create or update the Resource if appropriate.
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'''
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input_data = {in_data.name: in_data for in_data in data.values()}
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if rsrc.resource_id is None:
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rsrc.create_convergence(template_id, input_data)
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else:
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rsrc.update_convergence(template_id, input_data)
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def check_resource_cleanup(rsrc, template_id, data):
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'''
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Delete the Resource if appropriate.
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'''
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if rsrc.current_template_id != template_id:
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rsrc.delete_convergence(template_id, data)
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