def test_pickle_store_future_version():
data = {'foo': b'abcdefghijklmnopqrstuvwxyz'}
version = {'_id': sentinel._id, 'blob': '__chunked__VERSION_ONE_MILLION'}
coll = Mock()
arctic_lib = Mock()
datap = compressHC(cPickle.dumps(data, protocol=cPickle.HIGHEST_PROTOCOL))
data_1 = datap[0:5]
data_2 = datap[5:]
coll.find.return_value = [
{
'data': Binary(data_1),
'symbol': 'sentinel.symbol',
'segment': 0
},
{
'data': Binary(data_2),
'symbol': 'sentinel.symbol',
'segment': 1
},
]
arctic_lib.get_top_level_collection.return_value = coll
ps = PickleStore()
with pytest.raises(UnsupportedPickleStoreVersion) as e:
ps.read(arctic_lib, version, sentinel.symbol)
assert ('unsupported version of pickle store' in str(e))
def test_read_backward_compatibility():
"""Test backwards compatibility with a pickled file that's created with Python 2.7.3,
Numpy 1.7.1_ahl2 and Pandas 0.14.1
"""
fname = path.join(path.dirname(__file__), "data", "test-data.pkl")
# For newer versions; verify that unpickling fails when using cPickle
if PANDAS_VERSION >= LooseVersion("0.16.1"):
if sys.version_info[0] >= 3:
with pytest.raises(UnicodeDecodeError), open(fname) as fh:
cPickle.load(fh)
else:
with pytest.raises(TypeError), open(fname) as fh:
cPickle.load(fh)
# Verify that PickleStore() uses a backwards compatible unpickler.
store = PickleStore()
with open(fname) as fh:
# PickleStore compresses data with lz4
version = {'blob': compressHC(fh.read())}
df = store.read(sentinel.arctic_lib, version, sentinel.symbol)
expected = pd.DataFrame(range(4), pd.date_range(start="20150101",
periods=4))
assert (df == expected).all().all()
def test_pickle_chunk_V1_read():
data = {'foo': b'abcdefghijklmnopqrstuvwxyz'}
version = {'_id': sentinel._id, 'blob': '__chunked__'}
coll = Mock()
arctic_lib = Mock()
datap = lz4.compressHC(
cPickle.dumps(data, protocol=cPickle.HIGHEST_PROTOCOL))
data_1 = datap[0:5]
data_2 = datap[5:]
coll.find.return_value = [
{
'data': Binary(data_1),
'symbol': 'sentinel.symbol',
'segment': 0
},
{
'data': Binary(data_2),
'symbol': 'sentinel.symbol',
'segment': 1
},
]
arctic_lib.get_top_level_collection.return_value = coll
ps = PickleStore()
assert (data == ps.read(arctic_lib, version, sentinel.symbol))
def test_unpickle_highest_protocol():
"""Pandas version 0.14.1 fails to unpickle a pandas.Series() in compat mode if the
container has been pickled with HIGHEST_PROTOCOL.
"""
version = {
'blob':
compressHC(
cPickle.dumps(pd.Series(), protocol=cPickle.HIGHEST_PROTOCOL)),
}
store = PickleStore()
ps = store.read(sentinel.arctic_lib, version, sentinel.symbol)
expected = pd.Series()
assert (ps == expected).all()
