1 files changed, 40 insertions, 0 deletions
diff --git a/taskcluster/taskgraph/actions/cancel.py b/taskcluster/taskgraph/actions/cancel.py
new file mode 100644
index 0000000000..c9327da2a1
--- /dev/null
+++ b/taskcluster/taskgraph/actions/cancel.py
@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+import logging
+import requests
+
+from taskgraph.util.taskcluster import cancel_task
+from .registry import register_callback_action
+
+logger = logging.getLogger(__name__)
+
+
+@register_callback_action(
+    title="Cancel Task",
+    name="cancel",
+    symbol="cx",
+    description=("Cancel the given task"),
+    order=350,
+    context=[{}],
+)
+def cancel_action(parameters, graph_config, input, task_group_id, task_id):
+    # Note that this is limited by the scopes afforded to generic actions to
+    # only cancel tasks with the level-specific schedulerId.
+    try:
+        cancel_task(task_id, use_proxy=True)
+    except requests.HTTPError as e:
+        if e.response.status_code == 409:
+            # A 409 response indicates that this task is past its deadline.  It
+            # cannot be cancelled at this time, but it's also not running
+            # anymore, so we can ignore this error.
+            logger.info(
+                "Task {} is past its deadline and cannot be cancelled.".format(task_id)
+            )
+            return
+        raise