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# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.
# pylint: skip-file
"""
Built-in heal workflow.
"""
from aria import workflow
from .workflows import (install_node, uninstall_node)
from ..api import task
@workflow
def heal(ctx, graph, node_id):
"""
Built-in heal workflow..
:param ctx: workflow context
:param graph: graph which will describe the workflow.
:param node_id: ID of the node to heal
:return:
"""
failing_node = ctx.model.node.get(node_id)
host_node = ctx.model.node.get(failing_node.host.id)
failed_node_subgraph = _get_contained_subgraph(ctx, host_node)
failed_node_ids = list(n.id for n in failed_node_subgraph)
targeted_nodes = [node for node in ctx.nodes
if node.id not in failed_node_ids]
uninstall_subgraph = task.WorkflowTask(
heal_uninstall,
failing_nodes=failed_node_subgraph,
targeted_nodes=targeted_nodes
)
install_subgraph = task.WorkflowTask(
heal_install,
failing_nodes=failed_node_subgraph,
targeted_nodes=targeted_nodes)
graph.sequence(uninstall_subgraph, install_subgraph)
@workflow(suffix_template='{failing_nodes}')
def heal_uninstall(ctx, graph, failing_nodes, targeted_nodes):
"""
Uninstall phase of the heal mechanism.
:param ctx: workflow context
:param graph: task graph to edit
:param failing_nodes: failing nodes to heal
:param targeted_nodes: targets of the relationships where the failing node are
"""
node_sub_workflows = {}
# Create install stub workflow for each unaffected node
for node in targeted_nodes:
node_stub = task.StubTask()
node_sub_workflows[node.id] = node_stub
graph.add_tasks(node_stub)
# create install sub workflow for every node
for node in failing_nodes:
node_sub_workflow = task.WorkflowTask(uninstall_node,
node=node)
node_sub_workflows[node.id] = node_sub_workflow
graph.add_tasks(node_sub_workflow)
# create dependencies between the node sub workflow
for node in failing_nodes:
node_sub_workflow = node_sub_workflows[node.id]
for relationship in reversed(node.outbound_relationships):
graph.add_dependency(
node_sub_workflows[relationship.target_node.id],
node_sub_workflow)
# Add operations for intact nodes depending on a node belonging to nodes
for node in targeted_nodes:
node_sub_workflow = node_sub_workflows[node.id]
for relationship in reversed(node.outbound_relationships):
target_node = \
ctx.model.node.get(relationship.target_node.id)
target_node_subgraph = node_sub_workflows[target_node.id]
graph.add_dependency(target_node_subgraph, node_sub_workflow)
if target_node in failing_nodes:
dependency = task.create_relationship_tasks(
relationship=relationship,
operation_name='aria.interfaces.relationship_lifecycle.unlink')
graph.add_tasks(*dependency)
graph.add_dependency(node_sub_workflow, dependency)
@workflow(suffix_template='{failing_nodes}')
def heal_install(ctx, graph, failing_nodes, targeted_nodes):
"""
Install phase of the heal mechanism.
:param ctx: workflow context
:param graph: task graph to edit.
:param failing_nodes: failing nodes to heal
:param targeted_nodes: targets of the relationships where the failing node are
"""
node_sub_workflows = {}
# Create install sub workflow for each unaffected
for node in targeted_nodes:
node_stub = task.StubTask()
node_sub_workflows[node.id] = node_stub
graph.add_tasks(node_stub)
# create install sub workflow for every node
for node in failing_nodes:
node_sub_workflow = task.WorkflowTask(install_node,
node=node)
node_sub_workflows[node.id] = node_sub_workflow
graph.add_tasks(node_sub_workflow)
# create dependencies between the node sub workflow
for node in failing_nodes:
node_sub_workflow = node_sub_workflows[node.id]
if node.outbound_relationships:
dependencies = \
[node_sub_workflows[relationship.target_node.id]
for relationship in node.outbound_relationships]
graph.add_dependency(node_sub_workflow, dependencies)
# Add operations for intact nodes depending on a node
# belonging to nodes
for node in targeted_nodes:
node_sub_workflow = node_sub_workflows[node.id]
for relationship in node.outbound_relationships:
target_node = ctx.model.node.get(
relationship.target_node.id)
target_node_subworkflow = node_sub_workflows[target_node.id]
graph.add_dependency(node_sub_workflow, target_node_subworkflow)
if target_node in failing_nodes:
dependent = task.create_relationship_tasks(
relationship=relationship,
operation_name='aria.interfaces.relationship_lifecycle.establish')
graph.add_tasks(*dependent)
graph.add_dependency(dependent, node_sub_workflow)
def _get_contained_subgraph(context, host_node):
contained_instances = [node
for node in context.nodes
if node.host_fk == host_node.id and
node.host_fk != node.id]
result = [host_node]
if not contained_instances:
return result
result.extend(contained_instances)
for node in contained_instances:
result.extend(_get_contained_subgraph(context, node))
return set(result)
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