def maybe_start_download(self):
"""Check the time the last image refresh happened and initiate a new
one if older than 15 minutes.
"""
last_modified = tftppath.maas_meta_last_modified(self.tftp_root)
if last_modified is None:
yield self._start_download()
else:
age_in_seconds = self.clock.seconds() - last_modified
if age_in_seconds >= timedelta(minutes=15).total_seconds():
yield self._start_download()
def test_maas_meta_last_modified_returns_None_if_no_file(self):
observed = maas_meta_last_modified(
os.path.join(self.tftproot, "maas.meta"))
self.assertIsNone(observed)
def test_maas_meta_last_modified_returns_modification_time(self):
path = factory.make_file(self.tftproot, name="maas.meta")
expected = os.path.getmtime(path)
observed = maas_meta_last_modified(self.tftproot)
self.assertEqual(expected, observed)