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from __future__ import annotations
import pickle
import sys
import weakref
from functools import partial
from operator import add
import cloudpickle
import pytest
from dask.utils import tmpdir
from distributed import profile
from distributed.protocol import deserialize, serialize
from distributed.protocol.pickle import (
CLOUDPICKLE_GTE_20,
HIGHEST_PROTOCOL,
dumps,
loads,
)
from distributed.utils_test import save_sys_modules
class MemoryviewHolder:
def __init__(self, mv):
self.mv = memoryview(mv)
def __reduce_ex__(self, protocol):
if protocol >= 5:
return MemoryviewHolder, (pickle.PickleBuffer(self.mv),)
else:
return MemoryviewHolder, (self.mv.tobytes(),)
@pytest.mark.parametrize("protocol", {4, HIGHEST_PROTOCOL})
def test_pickle_data(protocol):
context = {"pickle-protocol": protocol}
data = [1, b"123", "123", [123], {}, set()]
for d in data:
assert loads(dumps(d, protocol=protocol)) == d
assert deserialize(*serialize(d, serializers=("pickle",), context=context)) == d
@pytest.mark.parametrize("protocol", {4, HIGHEST_PROTOCOL})
def test_pickle_out_of_band(protocol):
context = {"pickle-protocol": protocol}
mv = memoryview(b"123")
mvh = MemoryviewHolder(mv)
if protocol >= 5:
l = []
d = dumps(mvh, protocol=protocol, buffer_callback=l.append)
mvh2 = loads(d, buffers=l)
assert len(l) == 1
assert isinstance(l[0], pickle.PickleBuffer)
assert memoryview(l[0]) == mv
else:
mvh2 = loads(dumps(mvh, protocol=protocol))
assert isinstance(mvh2, MemoryviewHolder)
assert isinstance(mvh2.mv, memoryview)
assert mvh2.mv == mv
h, f = serialize(mvh, serializers=("pickle",), context=context)
mvh3 = deserialize(h, f)
assert isinstance(mvh3, MemoryviewHolder)
assert isinstance(mvh3.mv, memoryview)
assert mvh3.mv == mv
if protocol >= 5:
assert len(f) == 2
assert isinstance(f[0], bytes)
assert isinstance(f[1], memoryview)
assert f[1] == mv
else:
assert len(f) == 1
assert isinstance(f[0], bytes)
@pytest.mark.parametrize("protocol", {4, HIGHEST_PROTOCOL})
def test_pickle_empty(protocol):
context = {"pickle-protocol": protocol}
x = MemoryviewHolder(bytearray()) # Empty view
header, frames = serialize(x, serializers=("pickle",), context=context)
assert header["serializer"] == "pickle"
assert len(frames) >= 1
assert isinstance(frames[0], bytes)
if protocol >= 5:
assert len(frames) == 2
assert len(header["writeable"]) == 1
header["writeable"] = (False,) * len(frames)
else:
assert len(frames) == 1
assert len(header["writeable"]) == 0
y = deserialize(header, frames)
assert isinstance(y, MemoryviewHolder)
assert isinstance(y.mv, memoryview)
assert y.mv == x.mv
assert y.mv.nbytes == 0
assert y.mv.readonly
@pytest.mark.parametrize("protocol", {4, HIGHEST_PROTOCOL})
def test_pickle_numpy(protocol):
np = pytest.importorskip("numpy")
context = {"pickle-protocol": protocol}
x = np.ones(5)
assert (loads(dumps(x, protocol=protocol)) == x).all()
assert (
deserialize(*serialize(x, serializers=("pickle",), context=context)) == x
).all()
x = np.ones(5000)
assert (loads(dumps(x, protocol=protocol)) == x).all()
assert (
deserialize(*serialize(x, serializers=("pickle",), context=context)) == x
).all()
x = np.array([np.arange(3), np.arange(4, 6)], dtype=object)
x2 = loads(dumps(x, protocol=protocol))
assert x.shape == x2.shape
assert x.dtype == x2.dtype
assert x.strides == x2.strides
for e_x, e_x2 in zip(x.flat, x2.flat):
np.testing.assert_equal(e_x, e_x2)
h, f = serialize(x, serializers=("pickle",), context=context)
if protocol >= 5:
assert len(f) == 3
else:
assert len(f) == 1
x3 = deserialize(h, f)
assert x.shape == x3.shape
assert x.dtype == x3.dtype
assert x.strides == x3.strides
for e_x, e_x3 in zip(x.flat, x3.flat):
np.testing.assert_equal(e_x, e_x3)
if protocol >= 5:
x = np.ones(5000)
l = []
d = dumps(x, protocol=protocol, buffer_callback=l.append)
assert len(l) == 1
assert isinstance(l[0], pickle.PickleBuffer)
assert memoryview(l[0]) == memoryview(x)
assert (loads(d, buffers=l) == x).all()
h, f = serialize(x, serializers=("pickle",), context=context)
assert len(f) == 2
assert isinstance(f[0], bytes)
assert isinstance(f[1], memoryview)
assert (deserialize(h, f) == x).all()
@pytest.mark.parametrize("protocol", {4, HIGHEST_PROTOCOL})
def test_pickle_functions(protocol):
context = {"pickle-protocol": protocol}
def make_closure():
value = 1
def f(x): # closure
return x + value
return f
def funcs():
yield make_closure()
yield (lambda x: x + 1)
yield partial(add, 1)
for func in funcs():
wr = weakref.ref(func)
func2 = loads(dumps(func, protocol=protocol))
wr2 = weakref.ref(func2)
assert func2(1) == func(1)
func3 = deserialize(*serialize(func, serializers=("pickle",), context=context))
wr3 = weakref.ref(func3)
assert func3(1) == func(1)
del func, func2, func3
with profile.lock:
assert wr() is None
assert wr2() is None
assert wr3() is None
@pytest.mark.skipif(
not CLOUDPICKLE_GTE_20, reason="Pickle by value registration not supported"
)
def test_pickle_by_value_when_registered():
with save_sys_modules():
with tmpdir() as d:
try:
sys.path.insert(0, d)
module = f"{d}/mymodule.py"
with open(module, "w") as f:
f.write("def myfunc(x):\n return x + 1")
import mymodule # noqa
assert dumps(mymodule.myfunc) == pickle.dumps(
mymodule.myfunc, protocol=HIGHEST_PROTOCOL
)
cloudpickle.register_pickle_by_value(mymodule)
assert len(dumps(mymodule.myfunc)) > len(pickle.dumps(mymodule.myfunc))
finally:
sys.path.pop(0)
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