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from __future__ import division
import sys
import gc
import os
from distutils.version import LooseVersion
import ctypes
import blosc
# version number hack
vi = sys.version_info
PY26 = vi[0] == 2 and vi[1] == 6
PY27 = vi[0] == 2 and vi[1] == 7
PY3X = vi[0] == 3
if PY26:
import unittest2 as unittest
else:
import unittest
try:
import numpy
except ImportError:
has_numpy = False
else:
has_numpy = True
try:
import psutil
except ImportError:
psutil = None
class TestCodec(unittest.TestCase):
def test_basic_codec(self):
s = b'0123456789'
c = blosc.compress(s, typesize=1)
d = blosc.decompress(c)
self.assertEqual(s, d)
def test_get_clib(self):
s = b'0123456789'
for cname in blosc.compressor_list():
c = blosc.compress(s, typesize=1, cname=cname)
clib = blosc.get_clib(c)
self.assert_(clib == blosc.cname2clib[cname])
def test_all_compressors(self):
s = b'0123456789'*100
for cname in blosc.compressor_list():
c = blosc.compress(s, typesize=1, cname=cname)
d = blosc.decompress(c)
self.assertEqual(s, d)
def test_all_filters(self):
s = b'0123456789'*100
filters = [blosc.NOSHUFFLE, blosc.SHUFFLE]
# BITFILTER only works properly from 1.8.0 on
if LooseVersion(blosc.blosclib_version) >= LooseVersion("1.8.0"):
filters.append(blosc.BITSHUFFLE)
for filter_ in filters:
c = blosc.compress(s, typesize=1, shuffle=filter_)
d = blosc.decompress(c)
self.assertEqual(s, d)
def test_set_nthreads_exceptions(self):
self.assertRaises(ValueError, blosc.set_nthreads,
blosc.MAX_THREADS + 1)
def test_compress_input_types(self):
import numpy as np
# assume the expected answer was compressed from bytes
expected = blosc.compress(b'0123456789', typesize=1)
if not PY3X:
# Python 3 can't compress unicode
self.assertEqual(expected,
blosc.compress(u'0123456789', typesize=1))
# And the basic string is unicode
self.assertEqual(expected,
blosc.compress('0123456789', typesize=1))
# now for all the things that support the buffer interface
if not PY3X:
# Python 3 no longer has the buffer
self.assertEqual(expected, blosc.compress(
buffer(b'0123456789'), typesize=1))
if not PY26:
# memoryview doesn't exist on Python 2.6
self.assertEqual(expected, blosc.compress(
memoryview(b'0123456789'), typesize=1))
self.assertEqual(expected, blosc.compress(
bytearray(b'0123456789'), typesize=1))
self.assertEqual(expected, blosc.compress(
np.array([b'0123456789']), typesize=1))
def test_decompress_input_types(self):
import numpy as np
# assume the expected answer was compressed from bytes
expected = b'0123456789'
compressed = blosc.compress(expected, typesize=1)
# now for all the things that support the buffer interface
if not PY3X:
# Python 3 no longer has the buffer
self.assertEqual(expected, blosc.decompress(buffer(compressed)))
if not PY26:
# memoryview doesn't exist on Python 2.6
self.assertEqual(expected,
blosc.decompress(memoryview(compressed)))
self.assertEqual(expected, blosc.decompress(bytearray(compressed)))
self.assertEqual(expected, blosc.decompress(np.array([compressed])))
def test_decompress_input_types_as_bytearray(self):
import numpy as np
# assume the expected answer was compressed from bytes
expected = bytearray(b'0123456789')
compressed = blosc.compress(expected, typesize=1)
# now for all the things that support the buffer interface
if not PY3X:
# Python 3 no longer has the buffer
self.assertEqual(expected, blosc.decompress(buffer(compressed),
as_bytearray=True))
if not PY26:
# memoryview doesn't exist on Python 2.6
self.assertEqual(expected,
blosc.decompress(memoryview(compressed),
as_bytearray=True))
self.assertEqual(expected, blosc.decompress(bytearray(compressed),
as_bytearray=True))
self.assertEqual(expected, blosc.decompress(np.array([compressed]),
as_bytearray=True))
def test_compress_exceptions(self):
s = b'0123456789'
self.assertRaises(ValueError, blosc.compress, s, typesize=0)
self.assertRaises(ValueError, blosc.compress, s,
typesize=blosc.MAX_TYPESIZE+1)
self.assertRaises(ValueError, blosc.compress, s, typesize=1, clevel=-1)
self.assertRaises(ValueError, blosc.compress, s, typesize=1, clevel=10)
self.assertRaises(TypeError, blosc.compress, 1.0, 1)
self.assertRaises(TypeError, blosc.compress, ['abc'], 1)
self.assertRaises(ValueError, blosc.compress, 'abc',
typesize=1, cname='foo')
if PY3X:
# Python 3 doesn't support unicode
self.assertRaises(ValueError, blosc.compress,
'0123456789', typesize=0)
# Create a simple mock to avoid having to create a buffer of 2 GB
class LenMock(object):
def __len__(self):
return blosc.MAX_BUFFERSIZE+1
self.assertRaises(ValueError, blosc.compress, LenMock(), typesize=1)
def test_compress_ptr_exceptions(self):
# Make sure we do have a valid address, to reduce the chance of a
# segfault if we do actually start compressing because the exceptions
# aren't raised.
typesize, items = 8, 8
data = [float(i) for i in range(items)]
Array = ctypes.c_double * items
array = Array(*data)
address = ctypes.addressof(array)
self.assertRaises(ValueError, blosc.compress_ptr, address, items,
typesize=-1)
self.assertRaises(ValueError, blosc.compress_ptr, address, items,
typesize=blosc.MAX_TYPESIZE+1)
self.assertRaises(ValueError, blosc.compress_ptr, address, items,
typesize=typesize, clevel=-1)
self.assertRaises(ValueError, blosc.compress_ptr, address, items,
typesize=typesize, clevel=10)
self.assertRaises(TypeError, blosc.compress_ptr, 1.0, items,
typesize=typesize)
self.assertRaises(TypeError, blosc.compress_ptr, ['abc'], items,
typesize=typesize)
self.assertRaises(ValueError, blosc.compress_ptr, address, -1,
typesize=typesize)
self.assertRaises(ValueError, blosc.compress_ptr, address,
blosc.MAX_BUFFERSIZE+1, typesize=typesize)
def test_decompress_exceptions(self):
self.assertRaises(TypeError, blosc.decompress, 1.0)
self.assertRaises(TypeError, blosc.decompress, ['abc'])
def test_decompress_ptr_exceptions(self):
# make sure we do have a valid address
typesize, items = 8, 8
data = [float(i) for i in range(items)]
Array = ctypes.c_double * items
in_array = Array(*data)
c = blosc.compress_ptr(ctypes.addressof(in_array), items, typesize)
out_array = ctypes.create_string_buffer(items*typesize)
self.assertRaises(TypeError, blosc.decompress_ptr, 1.0,
ctypes.addressof(out_array))
self.assertRaises(TypeError, blosc.decompress_ptr, ['abc'],
ctypes.addressof(out_array))
self.assertRaises(TypeError, blosc.decompress_ptr, c, 1.0)
self.assertRaises(TypeError, blosc.decompress_ptr, c, ['abc'])
@unittest.skipIf(not has_numpy, "Numpy not available")
def test_pack_array_exceptions(self):
self.assertRaises(TypeError, blosc.pack_array, 'abc')
self.assertRaises(TypeError, blosc.pack_array, 1.0)
items = (blosc.MAX_BUFFERSIZE // 8) + 1
one = numpy.ones(1, dtype=numpy.int64)
self.assertRaises(ValueError, blosc.pack_array, one, clevel=-1)
self.assertRaises(ValueError, blosc.pack_array, one, clevel=10)
# use stride trick to make an array that looks like a huge one
ones = numpy.lib.stride_tricks.as_strided(one, shape=(1, items),
strides=(8, 0))[0]
# This should always raise an error
self.assertRaises(ValueError, blosc.pack_array, ones)
def test_unpack_array_exceptions(self):
self.assertRaises(TypeError, blosc.unpack_array, 1.0)
@unittest.skipIf(not psutil, "psutil not available, cannot test for leaks")
def test_no_leaks(self):
num_elements = 10000000
typesize = 8
data = [float(i) for i in range(num_elements)] # ~76MB
Array = ctypes.c_double * num_elements
array = Array(*data)
address = ctypes.addressof(array)
def leaks(operation, repeats=3):
gc.collect()
used_mem_before = psutil.Process(os.getpid()).memory_info()[0]
for _ in range(repeats):
operation()
gc.collect()
used_mem_after = psutil.Process(os.getpid()).memory_info()[0]
return (used_mem_after - used_mem_before) >= num_elements
def compress():
blosc.compress(array, typesize, clevel=1)
def compress_ptr():
blosc.compress_ptr(address, num_elements, typesize, clevel=0)
def decompress():
cx = blosc.compress(array, typesize, clevel=1)
blosc.decompress(cx)
def decompress_ptr():
cx = blosc.compress_ptr(address, num_elements, typesize, clevel=0)
blosc.decompress_ptr(cx, address)
self.assertFalse(leaks(compress), msg='compress leaks memory')
self.assertFalse(leaks(compress_ptr), msg='compress_ptr leaks memory')
self.assertFalse(leaks(decompress), msg='decompress leaks memory')
self.assertFalse(leaks(decompress_ptr), msg='decompress_ptr leaks memory')
def run(verbosity=2):
import blosc
import blosc.toplevel
blosc.print_versions()
suite = unittest.TestLoader().loadTestsFromTestCase(TestCodec)
# If in the future we split this test file in several, the auto-discover
# might be interesting
# suite = unittest.TestLoader().discover(start_dir='.', pattern='test*.py')
suite.addTests(unittest.TestLoader().loadTestsFromModule(blosc.toplevel))
assert unittest.TextTestRunner(verbosity=verbosity).\
run(suite).wasSuccessful()
if __name__ == '__main__':
run()
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