Swarming tasks: print start and end time

infra/bots/utils.py

Index: infra/bots/utils.py
diff --git a/infra/bots/utils.py b/infra/bots/utils.py
new file mode 100644
index 0000000000000000000000000000000000000000..ee648a26a4d4c6e3ee8fe0e08dd5ac9b240dab05
--- /dev/null
+++ b/infra/bots/utils.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+#
+# Copyright 2016 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+
+import datetime
+
+
+class print_timings(object):
+  def __init__(self):
+    self._start = None
+
+  def __enter__(self):
+    self._start = datetime.datetime.utcnow()
+    print 'Task started at %s GMT' % str(self._start)
+
+  def __exit__(self, t, v, tb):
+    finish = datetime.datetime.utcnow()
+    duration = (finish-self._start).total_seconds()
+    print 'Task finished at %s GMT (%f seconds)' % (str(finish), duration)