Use workflow for overcloud node delete

This patch adds support for using a workflow in tripleo-common
for deleting nodes from a stack (scale down).

Change-Id: Ia65734273d70ea0ae30d96122728950e1f0217b8
Partial-Bug: #1626736

tripleoclient/tests/v1/overcloud_node/test_overcloud_node.py

@@ -33,11 +33,26 @@ class TestDeleteNode(fakes.TestDeleteNode):
 
         # Get the command object to test
         self.cmd = overcloud_node.DeleteNode(self.app, None)
+        self.app.client_manager.workflow_engine = mock.Mock()
+        self.tripleoclient = mock.Mock()
+
+        self.websocket = mock.Mock()
+        self.websocket.__enter__ = lambda s: self.websocket
+        self.websocket.__exit__ = lambda s, *exc: None
+        self.tripleoclient = mock.Mock()
+        self.tripleoclient.messaging_websocket.return_value = self.websocket
+        self.app.client_manager.tripleoclient = self.tripleoclient
+
+        self.workflow = self.app.client_manager.workflow_engine
+
+        # Mock UUID4 generation for every test
+        uuid4_patcher = mock.patch('uuid.uuid4', return_value="UUID4")
+        self.mock_uuid4 = uuid4_patcher.start()
+        self.addCleanup(self.mock_uuid4.stop)
 
     # TODO(someone): This test does not pass with autospec=True, it should
     # probably be fixed so that it can pass with that.
-    @mock.patch('tripleo_common.scale.ScaleManager')
-    def test_node_delete(self, scale_manager):
+    def test_node_delete(self):
         argslist = ['instance1', 'instance2', '--templates',
                     '--stack', 'overcloud']
         verifylist = [
@@ -45,10 +60,21 @@ class TestDeleteNode(fakes.TestDeleteNode):
             ('nodes', ['instance1', 'instance2'])
         ]
         parsed_args = self.check_parser(self.cmd, argslist, verifylist)
+
+        self.websocket.wait_for_message.return_value = {
+            "status": "SUCCESS"
+        }
+
         self.cmd.take_action(parsed_args)
-        scale_manager.scaledown(parsed_args.nodes)
-        scale_manager.scaledown.assert_called_once_with(['instance1',
-                                                         'instance2'])
+
+        # Verify
+        self.workflow.executions.create.assert_called_once_with(
+            'tripleo.scale.v1.delete_node',
+            workflow_input={
+                'container': 'overcloud',
+                'queue_name': 'UUID4',
+                'nodes': ['instance1', 'instance2']
+            })
 
 
 class TestProvideNode(fakes.TestOvercloudNode):

tripleoclient/v1/overcloud_node.py

@@ -20,11 +20,11 @@ import uuid
 from osc_lib.command import command
 from osc_lib.i18n import _
 from osc_lib import utils
-from tripleo_common import scale
 
 from tripleoclient import constants
 from tripleoclient import utils as oooutils
 from tripleoclient.workflows import baremetal
+from tripleoclient.workflows import scale
 
 
 class DeleteNode(command.Command):
@@ -42,14 +42,21 @@ class DeleteNode(command.Command):
                             default=utils.env('OVERCLOUD_STACK_NAME'))
         parser.add_argument(
             '--templates', nargs='?', const=constants.TRIPLEO_HEAT_TEMPLATES,
-            help=_("The directory containing the Heat templates to deploy")
+            help=_("The directory containing the Heat templates to deploy. "
+                   "This argument is deprecated. The command now utilizes "
+                   "a deployment plan, which should be updated prior to "
+                   "running this command, should that be required. Otherwise "
+                   "this argument will be silently ignored."),
         )
         parser.add_argument(
             '-e', '--environment-file', metavar='<HEAT ENVIRONMENT FILE>',
             action='append', dest='environment_files',
-            help=_('Environment files to be passed to the heat stack-create '
-                   'or heat stack-update command. (Can be specified more than '
-                   'once.)')
+            help=_("Environment files to be passed to the heat stack-create "
+                   "or heat stack-update command. (Can be specified more than "
+                   "once.) This argument is deprecated. The command now "
+                   "utilizes a deployment plan, which should be updated prior "
+                   "to running this command, should that be required. "
+                   "Otherwise this argument will be silently ignored."),
         )
 
         return parser
@@ -58,14 +65,10 @@ class DeleteNode(command.Command):
         self.log.debug("take_action(%s)" % parsed_args)
         clients = self.app.client_manager
 
-        scale_manager = scale.ScaleManager(
-            heatclient=clients.orchestration,
-            stack_id=parsed_args.stack,
-            tht_dir=parsed_args.templates,
-            environment_files=parsed_args.environment_files)
         print("deleting nodes {0} from stack {1}".format(parsed_args.nodes,
                                                          parsed_args.stack))
-        scale_manager.scaledown(parsed_args.nodes)
+
+        scale.scale_down(clients, parsed_args.stack, parsed_args.nodes)
 
 
 class ProvideNode(command.Command):

tripleoclient/workflows/scale.py

@@ -0,0 +1,58 @@
+# Copyright 2016 Red Hat, Inc.
+# All Rights Reserved.
+#
+# Licensed 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.
+from __future__ import print_function
+
+import pprint
+import uuid
+
+from tripleoclient.workflows import base
+
+
+def delete_node(clients, **workflow_input):
+
+    workflow_client = clients.workflow_engine
+    tripleoclients = clients.tripleoclient
+    queue_name = workflow_input['queue_name']
+
+    execution = base.start_workflow(
+        workflow_client,
+        'tripleo.scale.v1.delete_node',
+        workflow_input=workflow_input
+    )
+
+    with tripleoclients.messaging_websocket(queue_name) as ws:
+        message = ws.wait_for_message(execution.id)
+        assert message['status'] == "SUCCESS", pprint.pformat(message)
+
+
+def scale_down(clients, plan_name, nodes, timeout=None):
+    """Deletes overcloud nodes from a heat stack.
+
+    :param clients: openstack clients
+    :param plan_name: name of the container holding the plan data
+    :param nodes: list of node id's to remove from the stack
+    :param timeout: timeout for stack update operation
+    """
+
+    workflow_input = {
+        "container": plan_name,
+        "nodes": nodes,
+        "queue_name": str(uuid.uuid4()),
+    }
+
+    if timeout is not None:
+        workflow_input['timeout'] = timeout
+
+    delete_node(clients, **workflow_input)