added delete neutron port task

- Added delete neutron port task and related unit tests
- Modified neutron fixture to throw an exception when requested to
  remove a non-existent port, to mimic python-neutronclient's
  behavior

Change-Id: Id8da6d95ea2c1d544b3e0d65b43a222f62a18ea7

cue/tests/taskflow/task/test_delete_port.py

@@ -0,0 +1,107 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 Hewlett-Packard Development Company, L.P.
+#
+# 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.
+
+import uuid
+
+from cue import client
+from cue.tests import base
+import cue.tests.test_fixtures.neutron
+import os_tasklib.neutron as neutron_task
+
+import neutronclient.common.exceptions as neutron_exc
+from taskflow import engines
+from taskflow.patterns import linear_flow
+
+
+def _find_port(port_id, port_list):
+    found = False
+    for port in port_list['ports']:
+        if port['id'] == port_id:
+            found = True
+            break
+
+    return found
+
+
+class DeletePortTests(base.TestCase):
+
+    additional_fixtures = [
+        cue.tests.test_fixtures.neutron.NeutronClient
+    ]
+
+    def setUp(self):
+        super(DeletePortTests, self).setUp()
+
+        network_name = 'test-network'
+
+        self.neutron_client = client.neutron_client()
+
+        network_list = self.neutron_client.list_networks(name=network_name)
+        self.valid_network = network_list['networks'][0]
+
+        # Delete port using DeletePort task
+        self.flow = linear_flow.Flow('create port').add(
+            neutron_task.DeletePort(os_client=self.neutron_client))
+
+    def test_delete_existing_port(self):
+        # create port
+        body_value = {
+            "port": {
+                "admin_state_up": True,
+                "name": "test port",
+                "network_id": self.valid_network['id'],
+                }
+        }
+        port_info = self.neutron_client.create_port(body=body_value)
+        port_id = port_info['port']['id']
+
+        # populate task_store with port-id of port created for this test
+        task_store = {
+            'port_id': port_id
+        }
+
+        # retrieve port list prior to delete
+        pre_port_list = self.neutron_client.list_ports()
+
+        # search for created port in port list
+        self.assertEqual(True, _find_port(port_id, pre_port_list),
+                         "port-id %s not found in neutron port list" % port_id)
+
+        engines.run(self.flow, store=task_store)
+
+        # retrieve port list after delete
+        post_port_list = self.neutron_client.list_ports()
+
+        # search for deleted port in port list
+        self.assertEqual(False, _find_port(port_id, post_port_list),
+                         "port-id %s found in neutron port after "
+                         "delete" % port_id)
+
+    def test_delete_nonexistent_port(self):
+        # generate random port_id
+        port_id = uuid.uuid4().hex
+
+        task_store = {
+            'port_id': port_id
+        }
+
+        # retrieve current port list
+        pre_port_list = self.neutron_client.list_ports()
+        self.assertEqual(False, _find_port(port_id, pre_port_list),
+                         "port-id %s found in neutron port list" % port_id)
+
+        # execute flow with parameters required for "CreatePort" task
+        self.assertRaises(neutron_exc.NeutronClientException, engines.run,
+                          self.flow, store=task_store)

cue/tests/test_fixtures/neutron.py

@@ -151,4 +151,6 @@ class NeutronClient(base.BaseFixture):
             port_id = port
 
         if port_id in self._port_list:
-            self._port_list.pop(port_id)
+            self._port_list.pop(port_id)
+        else:
+            raise exceptions.NeutronClientException("404 Not found")

os_tasklib/neutron/__init__.py

@@ -15,3 +15,4 @@
 
 
 from create_port import CreatePort  # noqa
+from delete_port import DeletePort  # noqa

os_tasklib/neutron/delete_port.py

@@ -0,0 +1,38 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 Hewlett-Packard Development Company, L.P.
+#
+# 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 cue.openstack.common import log as logging
+import os_tasklib
+
+
+LOG = logging.getLogger(__name__)
+
+
+class DeletePort(os_tasklib.BaseTask):
+    """DeletePort Task
+
+    This task interfaces with Neutron API and creates a port based on the
+    parameters provided to the Task.
+
+    """
+
+    def execute(self, port_id, **kwargs):
+        """Main execute method
+
+        :param port_id: Port ID of the port being deleted
+        :type port_id: string
+        """
+
+        self.os_client.delete_port(port=port_id)