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rust-pyo3: exposition of AncestorsIterator...
rust-pyo3: exposition of AncestorsIterator Compared to the early experiments, we have one less `RwLock` in the wrapping. Still that is somewhat redundant with `UnsafePyLeaked` being itself some kind of lock. In the original rust-cpython code, we were borrowing the `RefCell` with a method that can panic. Instead we are now converting the `PoisonError` that unlocking a `RwLock` can produce. Since all methods acquiring the `RwLock` are themselves protected by the GIL and do not release it before returning, nor do they leak RwLock guards, there is no risk of contention on these locks themselves.
Gregory Szorc - - Load All Authors

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test_data_structures.py
255 lines | 8.9 KiB | text/x-python | PythonLexer
/ contrib / python-zstandard / tests / test_data_structures.py
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import sys
import unittest
import zstandard as zstd
from .common import (
make_cffi,
TestCase,
)
@make_cffi
class TestCompressionParameters(TestCase):
def test_bounds(self):
zstd.ZstdCompressionParameters(
window_log=zstd.WINDOWLOG_MIN,
chain_log=zstd.CHAINLOG_MIN,
hash_log=zstd.HASHLOG_MIN,
search_log=zstd.SEARCHLOG_MIN,
min_match=zstd.MINMATCH_MIN + 1,
target_length=zstd.TARGETLENGTH_MIN,
strategy=zstd.STRATEGY_FAST,
)
zstd.ZstdCompressionParameters(
window_log=zstd.WINDOWLOG_MAX,
chain_log=zstd.CHAINLOG_MAX,
hash_log=zstd.HASHLOG_MAX,
search_log=zstd.SEARCHLOG_MAX,
min_match=zstd.MINMATCH_MAX - 1,
target_length=zstd.TARGETLENGTH_MAX,
strategy=zstd.STRATEGY_BTULTRA2,
)
def test_from_level(self):
p = zstd.ZstdCompressionParameters.from_level(1)
self.assertIsInstance(p, zstd.CompressionParameters)
self.assertEqual(p.window_log, 19)
p = zstd.ZstdCompressionParameters.from_level(-4)
self.assertEqual(p.window_log, 19)
def test_members(self):
p = zstd.ZstdCompressionParameters(
window_log=10,
chain_log=6,
hash_log=7,
search_log=4,
min_match=5,
target_length=8,
strategy=1,
)
self.assertEqual(p.window_log, 10)
self.assertEqual(p.chain_log, 6)
self.assertEqual(p.hash_log, 7)
self.assertEqual(p.search_log, 4)
self.assertEqual(p.min_match, 5)
self.assertEqual(p.target_length, 8)
self.assertEqual(p.compression_strategy, 1)
p = zstd.ZstdCompressionParameters(compression_level=2)
self.assertEqual(p.compression_level, 2)
p = zstd.ZstdCompressionParameters(threads=4)
self.assertEqual(p.threads, 4)
p = zstd.ZstdCompressionParameters(
threads=2, job_size=1048576, overlap_log=6
)
self.assertEqual(p.threads, 2)
self.assertEqual(p.job_size, 1048576)
self.assertEqual(p.overlap_log, 6)
self.assertEqual(p.overlap_size_log, 6)
p = zstd.ZstdCompressionParameters(compression_level=-1)
self.assertEqual(p.compression_level, -1)
p = zstd.ZstdCompressionParameters(compression_level=-2)
self.assertEqual(p.compression_level, -2)
p = zstd.ZstdCompressionParameters(force_max_window=True)
self.assertEqual(p.force_max_window, 1)
p = zstd.ZstdCompressionParameters(enable_ldm=True)
self.assertEqual(p.enable_ldm, 1)
p = zstd.ZstdCompressionParameters(ldm_hash_log=7)
self.assertEqual(p.ldm_hash_log, 7)
p = zstd.ZstdCompressionParameters(ldm_min_match=6)
self.assertEqual(p.ldm_min_match, 6)
p = zstd.ZstdCompressionParameters(ldm_bucket_size_log=7)
self.assertEqual(p.ldm_bucket_size_log, 7)
p = zstd.ZstdCompressionParameters(ldm_hash_rate_log=8)
self.assertEqual(p.ldm_hash_every_log, 8)
self.assertEqual(p.ldm_hash_rate_log, 8)
def test_estimated_compression_context_size(self):
p = zstd.ZstdCompressionParameters(
window_log=20,
chain_log=16,
hash_log=17,
search_log=1,
min_match=5,
target_length=16,
strategy=zstd.STRATEGY_DFAST,
)
# 32-bit has slightly different values from 64-bit.
self.assertAlmostEqual(
p.estimated_compression_context_size(), 1294464, delta=400
)
def test_strategy(self):
with self.assertRaisesRegex(
ValueError, "cannot specify both compression_strategy"
):
zstd.ZstdCompressionParameters(strategy=0, compression_strategy=0)
p = zstd.ZstdCompressionParameters(strategy=2)
self.assertEqual(p.compression_strategy, 2)
p = zstd.ZstdCompressionParameters(strategy=3)
self.assertEqual(p.compression_strategy, 3)
def test_ldm_hash_rate_log(self):
with self.assertRaisesRegex(
ValueError, "cannot specify both ldm_hash_rate_log"
):
zstd.ZstdCompressionParameters(
ldm_hash_rate_log=8, ldm_hash_every_log=4
)
p = zstd.ZstdCompressionParameters(ldm_hash_rate_log=8)
self.assertEqual(p.ldm_hash_every_log, 8)
p = zstd.ZstdCompressionParameters(ldm_hash_every_log=16)
self.assertEqual(p.ldm_hash_every_log, 16)
def test_overlap_log(self):
with self.assertRaisesRegex(
ValueError, "cannot specify both overlap_log"
):
zstd.ZstdCompressionParameters(overlap_log=1, overlap_size_log=9)
p = zstd.ZstdCompressionParameters(overlap_log=2)
self.assertEqual(p.overlap_log, 2)
self.assertEqual(p.overlap_size_log, 2)
p = zstd.ZstdCompressionParameters(overlap_size_log=4)
self.assertEqual(p.overlap_log, 4)
self.assertEqual(p.overlap_size_log, 4)
@make_cffi
class TestFrameParameters(TestCase):
def test_invalid_type(self):
with self.assertRaises(TypeError):
zstd.get_frame_parameters(None)
# Python 3 doesn't appear to convert unicode to Py_buffer.
if sys.version_info[0] >= 3:
with self.assertRaises(TypeError):
zstd.get_frame_parameters(u"foobarbaz")
else:
# CPython will convert unicode to Py_buffer. But CFFI won't.
if zstd.backend == "cffi":
with self.assertRaises(TypeError):
zstd.get_frame_parameters(u"foobarbaz")
else:
with self.assertRaises(zstd.ZstdError):
zstd.get_frame_parameters(u"foobarbaz")
def test_invalid_input_sizes(self):
with self.assertRaisesRegex(
zstd.ZstdError, "not enough data for frame"
):
zstd.get_frame_parameters(b"")
with self.assertRaisesRegex(
zstd.ZstdError, "not enough data for frame"
):
zstd.get_frame_parameters(zstd.FRAME_HEADER)
def test_invalid_frame(self):
with self.assertRaisesRegex(zstd.ZstdError, "Unknown frame descriptor"):
zstd.get_frame_parameters(b"foobarbaz")
def test_attributes(self):
params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x00\x00")
self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
self.assertEqual(params.window_size, 1024)
self.assertEqual(params.dict_id, 0)
self.assertFalse(params.has_checksum)
# Lowest 2 bits indicate a dictionary and length. Here, the dict id is 1 byte.
params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x01\x00\xff")
self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
self.assertEqual(params.window_size, 1024)
self.assertEqual(params.dict_id, 255)
self.assertFalse(params.has_checksum)
# Lowest 3rd bit indicates if checksum is present.
params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x04\x00")
self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
self.assertEqual(params.window_size, 1024)
self.assertEqual(params.dict_id, 0)
self.assertTrue(params.has_checksum)
# Upper 2 bits indicate content size.
params = zstd.get_frame_parameters(
zstd.FRAME_HEADER + b"\x40\x00\xff\x00"
)
self.assertEqual(params.content_size, 511)
self.assertEqual(params.window_size, 1024)
self.assertEqual(params.dict_id, 0)
self.assertFalse(params.has_checksum)
# Window descriptor is 2nd byte after frame header.
params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x00\x40")
self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
self.assertEqual(params.window_size, 262144)
self.assertEqual(params.dict_id, 0)
self.assertFalse(params.has_checksum)
# Set multiple things.
params = zstd.get_frame_parameters(
zstd.FRAME_HEADER + b"\x45\x40\x0f\x10\x00"
)
self.assertEqual(params.content_size, 272)
self.assertEqual(params.window_size, 262144)
self.assertEqual(params.dict_id, 15)
self.assertTrue(params.has_checksum)
def test_input_types(self):
v = zstd.FRAME_HEADER + b"\x00\x00"
mutable_array = bytearray(len(v))
mutable_array[:] = v
sources = [
memoryview(v),
bytearray(v),
mutable_array,
]
for source in sources:
params = zstd.get_frame_parameters(source)
self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
self.assertEqual(params.window_size, 1024)
self.assertEqual(params.dict_id, 0)
self.assertFalse(params.has_checksum)