1 files changed, 64 insertions, 0 deletions
diff --git a/taskcluster/taskgraph/actions/cancel_all.py b/taskcluster/taskgraph/actions/cancel_all.py
new file mode 100644
index 0000000000..1c3d1948e3
--- /dev/null
+++ b/taskcluster/taskgraph/actions/cancel_all.py
@@ -0,0 +1,64 @@
+# -*- 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 concurrent.futures as futures
+import logging
+import os
+import requests
+
+from taskgraph.util.taskcluster import (
+    list_task_group_incomplete_task_ids,
+    cancel_task,
+    CONCURRENCY,
+)
+from .registry import register_callback_action
+
+logger = logging.getLogger(__name__)
+
+
+@register_callback_action(
+    title="Cancel All",
+    name="cancel-all",
+    symbol="cAll",
+    description=(
+        "Cancel all running and pending tasks created by the decision task "
+        "this action task is associated with."
+    ),
+    order=400,
+    context=[],
+)
+def cancel_all_action(parameters, graph_config, input, task_group_id, task_id):
+    def do_cancel_task(task_id):
+        logger.info("Cancelling task {}".format(task_id))
+        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
+
+    own_task_id = os.environ.get("TASK_ID", "")
+    to_cancel = [
+        t
+        for t in list_task_group_incomplete_task_ids(task_group_id)
+        if t != own_task_id
+    ]
+
+    logger.info("Cancelling {} tasks".format(len(to_cancel)))
+    with futures.ThreadPoolExecutor(CONCURRENCY) as e:
+        cancel_futs = [e.submit(do_cancel_task, t) for t in to_cancel]
+        for f in futures.as_completed(cancel_futs):
+            f.result()