def test_deserialize_malformed_host_info_raises(self):
"""Deserializing a malformed host_info raises."""
info = host_info.HostInfo()
serialized_fp = cStringIO.StringIO()
host_info.json_serialize(info, serialized_fp)
serialized_fp.seek(0)
serialized_dict = json.load(serialized_fp)
del serialized_dict['labels']
serialized_no_version_str = json.dumps(serialized_dict)
with self.assertRaises(host_info.DeserializationError):
host_info.json_deserialize(
cStringIO.StringIO(serialized_no_version_str))
def test_enforce_compatibility_version_1(self):
"""Tests that required fields are never dropped.
Never change this test. If you must break compatibility, uprev the
serializer version and add a new test for the newer version.
Adding a field to compat_info_str means we're making the new field
mandatory. This breaks backwards compatibility.
Removing a field from compat_info_str means we're no longer requiring a
field to be mandatory. This breaks forwards compatibility.
"""
compat_dict = {'serializer_version': 1, 'attributes': {}, 'labels': []}
serialized_str = json.dumps(compat_dict)
serialized_fp = cStringIO.StringIO(serialized_str)
host_info.json_deserialize(serialized_fp)
def test_round_trip_empty(self):
"""Serializing - deserializing empty HostInfo keeps it unchanged."""
info = host_info.HostInfo()
serialized_fp = cStringIO.StringIO()
host_info.json_serialize(info, serialized_fp)
serialized_fp.seek(0)
got = host_info.json_deserialize(serialized_fp)
self.assertEqual(got, info)
def test_round_trip_non_empty(self):
"""Serializing - deserializing non-empty HostInfo keeps it unchanged."""
info = host_info.HostInfo(labels=['label1'],
attributes={'attrib': 'val'})
serialized_fp = cStringIO.StringIO()
host_info.json_serialize(info, serialized_fp)
serialized_fp.seek(0)
got = host_info.json_deserialize(serialized_fp)
self.assertEqual(got, info)
def _refresh_impl_locked(self):
"""Same as _refresh_impl, but assumes relevant files are locked."""
try:
with open(self._store_file, 'r') as fp:
return host_info.json_deserialize(fp)
except IOError as e:
if e.errno == errno.ENOENT:
raise host_info.StoreError(
'No backing file. You must commit to the store before '
'trying to read a value from it.')
raise host_info.StoreError('Failed to read backing file (%s) : %r'
% (self._store_file, e))
except host_info.DeserializationError as e:
raise host_info.StoreError(
'Failed to desrialize backing file %s: %r' %
(self._store_file, e))
def test_deserialize_malformed_json_raises(self):
"""Deserializing a malformed string raises."""
with self.assertRaises(host_info.DeserializationError):
host_info.json_deserialize(cStringIO.StringIO('{labels:['))
