Adding support for converting a timedelta to a duration.

core/google/cloud/_helpers.py

@@ -27,6 +27,7 @@
 from threading import local as Local
 
 import google.auth
+from google.protobuf import duration_pb2
 from google.protobuf import timestamp_pb2
 import google_auth_httplib2
 
@@ -424,6 +425,20 @@ def _datetime_to_pb_timestamp(when):
     return timestamp_pb2.Timestamp(seconds=seconds, nanos=nanos)
 
 
+def _timedelta_to_pb_duration(timedelta):
+    """Convert a timedelta object to a Duration protobuf.
+
+    :type timedelta: :class:`datetime.timedelta`
+    :param timedelta: the timedelta to convert
+
+    :rtype: :class:`google.protobuf.duration_pb2.Duration`
+    :returns: A duraiton protobuf corresponding to the object.
+    """
+    seconds = int(timedelta.total_seconds())
+    nanos = timedelta.microseconds * 10**3
+    return duration_pb2.Duration(seconds=seconds, nanos=nanos)
+
+
 def _name_from_project_path(path, project, template):
     """Validate a URI path and get the leaf object's name.
 

core/unit_tests/test__helpers.py

@@ -594,6 +594,29 @@ def test_it(self):
         self.assertEqual(self._call_fut(dt_stamp), timestamp)
 
 
+class Test__timedelta_to_pb_duration(unittest.TestCase):
+
+    def _callFUT(self, when):
+        from google.cloud._helpers import _timedelta_to_pb_duration
+        return _timedelta_to_pb_duration(when)
+
+    def test_wo_days(self):
+        import datetime
+        from google.protobuf.duration_pb2 import Duration
+
+        timedelta = datetime.timedelta(seconds=1, microseconds=123456)
+        duration = Duration(seconds=1, nanos=123456000)
+        self.assertEqual(self._callFUT(timedelta), duration)
+
+    def test_w_days(self):
+        import datetime
+        from google.protobuf.duration_pb2 import Duration
+
+        timedelta = datetime.timedelta(days=1, seconds=22, microseconds=123456)
+        duration = Duration(seconds=86422, nanos=123456000)
+        self.assertEqual(self._callFUT(timedelta), duration)
+
+
 class Test__name_from_project_path(unittest.TestCase):
 
     PROJECT = 'PROJECT'