Add action for running archive-deleted-rows

Add an action for moving stale data to shadow tables using
nova-manage *1. This will speed up other operations such as
map_instances which no longer need to work against stale
data.

*1 https://docs.openstack.org/nova/pike/cli/nova-manage.html

Change-Id: I03f3d641b50cfc6f02262edb0f714ba6e9566775
Partial-Bug: #1742115

actions.yaml

@@ -4,3 +4,10 @@ pause:
   description: Pause the nova-cloud-controller unit.  This action will stop related services.
 resume:
   descrpition: Resume the nova-cloud-controller unit.  This action will start related services.
+archive-data:
+  descrpition: Run job to archive deleted rows in database
+  params:
+    batch-size:
+      type: integer
+      default: 10000
+      description: Archive old data to shadow tables

actions/actions.py

@@ -19,11 +19,16 @@ import sys
 
 sys.path.append('hooks/')
 
-from charmhelpers.core.hookenv import action_fail
+from charmhelpers.core.hookenv import (
+    action_fail,
+    action_get,
+    action_set,
+)
 from nova_cc_utils import (
     pause_unit_helper,
     resume_unit_helper,
     register_configs,
+    archive_deleted_rows,
 )
 
 
@@ -40,9 +45,20 @@ def resume(args):
     resume_unit_helper(register_configs())
 
 
+def archive_data(args):
+    """Run data archival process
+    @raises Exception should the archival fail"""
+    action_set({
+        'archive-deleted-rows': archive_deleted_rows(
+            max_rows=action_get('batch-size'))})
+
+
 # A dictionary of all the defined actions to callables (which take
 # parsed arguments).
-ACTIONS = {"pause": pause, "resume": resume}
+ACTIONS = {
+    "pause": pause,
+    "resume": resume,
+    "archive-data": archive_data}
 
 
 def main(args):

actions/archive-data

@@ -0,0 +1 @@
+actions.py

hooks/nova_cc_utils.py

@@ -775,6 +775,24 @@ def map_instances():
         raise
 
 
+def archive_deleted_rows(max_rows=None):
+    log('Archiving deleted rows', level=INFO)
+    cmd = ['nova-manage', 'db', 'archive_deleted_rows', '--verbose']
+    if max_rows:
+        cmd.extend(['--max_rows', str(max_rows)])
+    process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
+    stdout, stderr = process.communicate()
+    exit_code = process.wait()
+    if exit_code not in [0, 1]:
+        msg = 'Archiving deleted rows failed\nstdout: {}\nstderr: {}'.format(
+            stdout,
+            stderr)
+        log(msg, level=ERROR)
+        raise Exception(msg)
+    else:
+        return stdout
+
+
 def add_hosts_to_cell():
     '''Map compute hosts to cell'''
     log('Cell1 discover_hosts', level=INFO)

unit_tests/test_nova_cc_utils.py

@@ -1033,6 +1033,37 @@ class NovaCCUtilsTests(CharmTestCase):
                                               'map_instances', '--cell_uuid',
                                               cell_uuid])
 
+    @patch('subprocess.Popen')
+    def test_archive_deleted_rows(self, mock_popen):
+        process_mock = MagicMock()
+        attrs = {
+            'communicate.return_value': ('output', 'error'),
+            'wait.return_value': 0}
+        process_mock.configure_mock(**attrs)
+        mock_popen.return_value = process_mock
+        expectd_calls = [
+            call([
+                'nova-manage',
+                'db',
+                'archive_deleted_rows',
+                '--verbose'], stdout=-1),
+            call().communicate(),
+            call().wait()]
+
+        utils.archive_deleted_rows()
+        self.assertEqual(mock_popen.mock_calls, expectd_calls)
+
+    @patch('subprocess.Popen')
+    def test_archive_deleted_rows_excpetion(self, mock_popen):
+        process_mock = MagicMock()
+        attrs = {
+            'communicate.return_value': ('output', 'error'),
+            'wait.return_value': 123}
+        process_mock.configure_mock(**attrs)
+        mock_popen.return_value = process_mock
+        with self.assertRaises(Exception):
+            utils.archive_deleted_rows()
+
     @patch.object(utils, 'get_cell_uuid')
     @patch('subprocess.check_output')
     def test_add_hosts_to_cell(self, mock_check_output, mock_get_cell_uuid):