Add 'cancel_update' action and command

Change-Id: I66590110cc065622a8af03286c272a658bc12646
Implements: blueprint cancel-update-stack

heatclient/tests/test_shell.py

@@ -1594,6 +1594,34 @@ class ShellTestUserPass(ShellBase):
         for r in required:
             self.assertRegexpMatches(update_text, r)
 
+    @httpretty.activate
+    def test_stack_cancel_update(self):
+        self.register_keystone_auth_fixture()
+        expected_data = {'cancel_update': None}
+        resp = fakes.FakeHTTPResponse(
+            202,
+            'Accepted',
+            {},
+            'The request is accepted for processing.')
+        http.HTTPClient.json_request(
+            'POST', '/stacks/teststack2/actions',
+            data=expected_data
+        ).AndReturn((resp, None))
+        fakes.script_heat_list()
+
+        self.m.ReplayAll()
+
+        update_text = self.shell('stack-cancel-update teststack2')
+
+        required = [
+            'stack_name',
+            'id',
+            'teststack2',
+            '1'
+        ]
+        for r in required:
+            self.assertRegexpMatches(update_text, r)
+
     @httpretty.activate
     def test_stack_delete(self):
         self.register_keystone_auth_fixture()

heatclient/v1/actions.py

@@ -46,3 +46,10 @@ class ActionManager(stacks.StackChildManager):
         resp, body = self.client.json_request('POST',
                                               '/stacks/%s/actions' % stack_id,
                                               data=body)
+
+    def cancel_update(self, stack_id):
+        """Cancel running update of a stack."""
+        body = {'cancel_update': None}
+        resp, body = self.client.json_request('POST',
+                                              '/stacks/%s/actions' % stack_id,
+                                              data=body)

heatclient/v1/shell.py

@@ -464,6 +464,19 @@ def do_stack_update(hc, args):
     do_stack_list(hc)
 
 
+@utils.arg('id', metavar='<NAME or ID>',
+           help='Name or ID of stack to cancel update for.')
+def do_stack_cancel_update(hc, args):
+    '''Cancel currently running update of the stack.'''
+    fields = {'stack_id': args.id}
+    try:
+        hc.actions.cancel_update(**fields)
+    except exc.HTTPNotFound:
+        raise exc.CommandError('Stack not found: %s' % args.id)
+    else:
+        do_stack_list(hc)
+
+
 def do_list(hc):
     '''DEPRECATED! Use stack-list instead.'''
     logger.warning('DEPRECATED! Use stack-list instead.')