Add changes-since support when list servers

Nova API supports change-since filter when list servers:
https://github.com/openstack/nova/blob/master/nova/api/openstack/compute/servers.py#L325-L331
but in python-novaclient we don't.
This patch  add the support for change-since when list servers.

Closes-bug: #1551591

depends-on: Ic2f239f634f917a5771b0401a5073546c710c036

Change-Id: I27f2d1e33a56d357e247111b338c93861716cfee

novaclient/tests/functional/v2/legacy/test_servers.py

@@ -13,6 +13,7 @@
 import uuid
 
 from novaclient.tests.functional import base
+from oslo_utils import timeutils
 
 
 class TestServersBootNovaClient(base.ClientTestBase):
@@ -84,6 +85,16 @@ class TestServersListNovaClient(base.ClientTestBase):
         servers = output.split("\n")[3:-2]
         self.assertEqual(1, len(servers), output)
 
+    def test_list_with_changes_since(self):
+        now = timeutils.isotime()
+        name = str(uuid.uuid4())
+        self._create_servers(name, 1)
+        output = self.nova("list", params="--changes-since %s" % now)
+        self.assertIn(name, output, output)
+        now = timeutils.isotime()
+        output = self.nova("list", params="--changes-since %s" % now)
+        self.assertNotIn(name, output, output)
+
     def test_list_all_servers(self):
         name = str(uuid.uuid4())
         precreated_servers = self._create_servers(name, 3)

novaclient/tests/unit/v2/test_shell.py

@@ -1063,6 +1063,15 @@ class ShellTest(utils.TestCase):
         self.run_command('list --limit 3')
         self.assert_called('GET', '/servers/detail?limit=3')
 
+    def test_list_with_changes_since(self):
+        self.run_command('list --changes-since 2016-02-29T06:23:22')
+        self.assert_called(
+            'GET', '/servers/detail?changes-since=2016-02-29T06%3A23%3A22')
+
+    def test_list_with_changes_since_invalid_value(self):
+        self.assertRaises(exceptions.CommandError,
+                          self.run_command, 'list --changes-since 0123456789')
+
     def test_meta_parsing(self):
         meta = ['key1=meta1', 'key2=meta2']
         ref = {'key1': 'meta1', 'key2': 'meta2'}

novaclient/v2/shell.py

@@ -1458,6 +1458,14 @@ def do_image_delete(cs, args):
            "will be displayed. If limit is bigger than 'osapi_max_limit' "
            "option of Nova API, limit 'osapi_max_limit' will be used "
            "instead."))
+@utils.arg(
+    '--changes-since',
+    dest='changes_since',
+    metavar='<changes_since>',
+    default=None,
+    help=_("List only servers changed after a certain point of time."
+           "The provided time should be an ISO 8061 formated time."
+           "ex 2016-03-04T06:27:59Z ."))
 def do_list(cs, args):
     """List active servers."""
     imageid = None
@@ -1482,7 +1490,8 @@ def do_list(cs, args):
         'user_id': args.user,
         'host': args.host,
         'deleted': args.deleted,
-        'instance_name': args.instance_name}
+        'instance_name': args.instance_name,
+        'changes-since': args.changes_since}
 
     filters = {'flavor': lambda f: f['id'],
                'security_groups': utils._format_security_groups}
@@ -1504,6 +1513,13 @@ def do_list(cs, args):
             sort_keys.append(sort_key)
             sort_dirs.append(sort_dir)
 
+    if search_opts['changes-since']:
+        try:
+            timeutils.parse_isotime(search_opts['changes-since'])
+        except ValueError:
+            raise exceptions.CommandError(_('Invalid changes-since value: %s')
+                                          % search_opts['changes-since'])
+
     servers = cs.servers.list(detailed=detailed,
                               search_opts=search_opts,
                               sort_keys=sort_keys,
@@ -1554,6 +1570,8 @@ def do_list(cs, args):
         # Tenant ID as well
         if search_opts['all_tenants']:
             columns.insert(2, 'Tenant ID')
+        if search_opts['changes-since']:
+            columns.append('Updated')
     formatters['Networks'] = utils._format_servers_list_networks
     sortby_index = 1
     if args.sort: