Github user mxmrlv commented on a diff in the pull request:
https://github.com/apache/incubator-ariatosca/pull/20#discussion_r87781904
--- Diff: aria/context/toolbelt.py ---
@@ -0,0 +1,102 @@
+# 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.
+"""
+provides with different tools when working with the operation.
+"""
+
+from contextlib import contextmanager
+
+from .. import exceptions
+from . import operation
+
+
+class _BaseToolbelt(object):
+ """
+ Base tool belt
+ """
+ def __init__(self):
+ self._op_context = None
+ self._workflow_context = None
+
+ @contextmanager
+ def use(self, operation_context):
+ """
+ Context manager which switches the current toolbelt with the
supplied ctx
+ :param operation_context:
+ :return:
+ """
+ assert isinstance(operation_context,
operation.BaseOperationContext)
+ _op_context = self._op_context
+ _workflow_context = self._workflow_context
+
+ self._op_context = operation_context
+ self._workflow_context = operation_context._workflow_context
+ try:
+ yield self
+ finally:
+ self._op_context = _op_context
+ self._workflow_context = _workflow_context
+
+
+class _NodeToolBelt(_BaseToolbelt):
+ """
+ Node operation related tool belt
+ """
+ @property
+ def relationships_to_me(self):
+ """
+ Any relationship which the current node is the target of
+ :return:
+ """
+ assert isinstance(self._op_context, operation.NodeOperationContext)
+ for node_instance in self._workflow_context.node_instances:
+ for relationship_instance in
node_instance.relationship_instances:
+ if relationship_instance.target_id ==
self._op_context.node_instance.id:
+ yield relationship_instance
+
+ @property
+ def host_ip(self):
+ """
+ The host ip of the current node
+ :return:
+ """
+ assert isinstance(self._op_context, operation.NodeOperationContext)
+ host_id = self._op_context._actor.host_id
+ host_instance =
self._workflow_context.model.node_instance.get(host_id)
+ return host_instance.runtime_properties.get('ip')
+
+
+class _RelationshipToolBelt(_BaseToolbelt):
+ """
+ Relationship operation related tool belt
+ """
+ pass
+
+_operation_toolbelt = _NodeToolBelt()
+_relationship_toolbelt = _RelationshipToolBelt()
+
+
+def toolbelt(operation_context):
+ """
+ Get a toolbelt according to the current operation executor
+ :param operation_context:
+ :return:
+ """
+ if isinstance(operation_context, operation.NodeOperationContext):
+ return _operation_toolbelt.use(operation_context)
+ elif isinstance(operation_context,
operation.RelationshipOperationContext):
+ return _relationship_toolbelt.use(operation_context)
+ else:
+ raise exceptions.TaskException("Operation context not supported")
--- End diff --
raise RunTimeError
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