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from __future__ import annotations
import pytest
import dask
from distributed.protocol import dumps, loads, maybe_compress, msgpack, to_serialize
from distributed.protocol.compression import (
compressions,
default_compression,
get_default_compression,
)
from distributed.protocol.cuda import cuda_deserialize, cuda_serialize
from distributed.protocol.serialize import (
Serialize,
Serialized,
dask_deserialize,
dask_serialize,
deserialize,
serialize,
)
from distributed.system import MEMORY_LIMIT
from distributed.utils import nbytes
def test_protocol():
for msg in [1, "a", b"a", {"x": 1}, {b"x": 1}, {"x": b""}, {}]:
assert loads(dumps(msg)) == msg
@pytest.mark.parametrize(
"config,default",
[
("auto", default_compression),
(None, None),
("zlib", "zlib"),
("foo", ValueError),
],
)
def test_compression_config(config, default):
with dask.config.set({"distributed.comm.compression": config}):
if type(default) is type and issubclass(default, Exception):
with pytest.raises(default):
assert get_default_compression()
else:
assert get_default_compression() == default
def test_compression_1():
pytest.importorskip("lz4")
np = pytest.importorskip("numpy")
x = np.ones(1000000)
b = x.tobytes()
frames = dumps({"x": Serialize(b)})
assert sum(map(nbytes, frames)) < nbytes(b)
y = loads(frames)
assert {"x": b} == y
def test_compression_2():
pytest.importorskip("lz4")
np = pytest.importorskip("numpy")
x = np.random.random(10000)
msg = dumps(to_serialize(x.data))
compression = msgpack.loads(msg[1]).get("compression")
assert all(c is None for c in compression)
def test_compression_3():
pytest.importorskip("lz4")
np = pytest.importorskip("numpy")
x = np.ones(1000000)
frames = dumps({"x": Serialize(x.data)})
assert sum(map(nbytes, frames)) < x.nbytes
y = loads(frames)
assert {"x": x.data} == y
def test_compression_without_deserialization():
pytest.importorskip("lz4")
np = pytest.importorskip("numpy")
x = np.ones(1000000)
frames = dumps({"x": Serialize(x)})
assert all(len(frame) < 1000000 for frame in frames)
msg = loads(frames, deserialize=False)
assert all(len(frame) < 1000000 for frame in msg["x"].frames)
def test_small():
assert sum(map(nbytes, dumps(b""))) < 10
assert sum(map(nbytes, dumps(1))) < 10
def test_small_and_big():
d = {"x": (1, 2, 3), "y": b"0" * 10000000}
L = dumps(d)
assert loads(L) == d
# assert loads([small_header, small]) == {'x': [1, 2, 3]}
# assert loads([big_header, big]) == {'y': d['y']}
@pytest.mark.parametrize(
"lib,compression",
[(None, None), ("zlib", "zlib"), ("lz4", "lz4"), ("zstandard", "zstd")],
)
def test_maybe_compress(lib, compression):
if lib:
pytest.importorskip(lib)
try_converters = [bytes, memoryview]
for f in try_converters:
payload = b"123"
assert maybe_compress(f(payload), compression=compression) == (None, payload)
payload = b"0" * 10000
rc, rd = maybe_compress(f(payload), compression=compression)
assert rc == compression
assert compressions[rc]["decompress"](rd) == payload
@pytest.mark.parametrize(
"lib,compression",
[(None, None), ("zlib", "zlib"), ("lz4", "lz4"), ("zstandard", "zstd")],
)
def test_maybe_compress_config_default(lib, compression):
if lib:
pytest.importorskip(lib)
try_converters = [bytes, memoryview]
with dask.config.set({"distributed.comm.compression": compression}):
for f in try_converters:
payload = b"123"
assert maybe_compress(f(payload)) == (None, payload)
payload = b"0" * 10000
rc, rd = maybe_compress(f(payload))
assert rc == compression
assert compressions[rc]["decompress"](rd) == payload
def test_maybe_compress_sample():
np = pytest.importorskip("numpy")
lz4 = pytest.importorskip("lz4")
payload = np.random.randint(0, 255, size=10000).astype("u1").tobytes()
fmt, compressed = maybe_compress(payload)
assert fmt is None
assert compressed == payload
def test_large_bytes():
for tp in (bytes, bytearray):
msg = {"x": to_serialize(tp(b"0" * 1000000)), "y": 1}
frames = dumps(msg)
msg["x"] = msg["x"].data
assert loads(frames) == msg
assert len(frames[0]) < 1000
assert len(frames[1]) < 1000
@pytest.mark.slow
def test_large_messages():
np = pytest.importorskip("numpy")
pytest.importorskip("lz4")
if MEMORY_LIMIT < 8e9:
pytest.skip("insufficient memory")
x = np.random.randint(0, 255, size=200000000, dtype="u1")
msg = {
"x": [Serialize(x), b"small_bytes"],
"y": {"a": Serialize(x), "b": b"small_bytes"},
}
b = dumps(msg)
msg2 = loads(b)
assert msg["x"][1] == msg2["x"][1]
assert msg["y"]["b"] == msg2["y"]["b"]
assert (msg["x"][0].data == msg2["x"][0]).all()
assert (msg["y"]["a"].data == msg2["y"]["a"]).all()
def test_large_messages_map():
if MEMORY_LIMIT < 8e9:
pytest.skip("insufficient memory")
x = {i: "mystring_%d" % i for i in range(100000)}
b = dumps(x)
x2 = loads(b)
assert x == x2
def test_loads_deserialize_False():
frames = dumps({"data": Serialize(123), "status": "OK"})
msg = loads(frames)
assert msg == {"data": 123, "status": "OK"}
msg = loads(frames, deserialize=False)
assert msg["status"] == "OK"
assert isinstance(msg["data"], Serialized)
result = deserialize(msg["data"].header, msg["data"].frames)
assert result == 123
def test_loads_without_deserialization_avoids_compression():
pytest.importorskip("lz4")
b = b"0" * 100000
msg = {"x": 1, "data": to_serialize(b)}
frames = dumps(msg)
assert sum(map(nbytes, frames)) < 10000
msg2 = loads(frames, deserialize=False)
assert sum(map(nbytes, msg2["data"].frames)) < 10000
msg3 = dumps(msg2)
msg4 = loads(msg3)
assert msg4 == {"x": 1, "data": b"0" * 100000}
def eq_frames(a, b):
if b"headers" in a:
return msgpack.loads(a, use_list=False, strict_map_key=False) == msgpack.loads(
b, use_list=False, strict_map_key=False
)
else:
return a == b
def test_dumps_loads_Serialize():
msg = {"x": 1, "data": Serialize(123)}
frames = dumps(msg)
assert len(frames) > 2
result = loads(frames)
assert result == {"x": 1, "data": 123}
result2 = loads(frames, deserialize=False)
assert result2["x"] == 1
assert isinstance(result2["data"], Serialized)
assert any(a is b for a in result2["data"].frames for b in frames)
frames2 = dumps(result2)
assert all(map(eq_frames, frames, frames2))
result3 = loads(frames2)
assert result == result3
def test_dumps_loads_Serialized():
msg = {"x": 1, "data": Serialized(*serialize(123))}
frames = dumps(msg)
assert len(frames) > 2
result = loads(frames)
assert result == {"x": 1, "data": 123}
result2 = loads(frames, deserialize=False)
assert result2 == msg
frames2 = dumps(result2)
assert all(map(eq_frames, frames, frames2))
result3 = loads(frames2)
assert result == result3
def test_maybe_compress_memoryviews():
np = pytest.importorskip("numpy")
pytest.importorskip("lz4")
x = np.arange(1000000, dtype="int64")
compression, payload = maybe_compress(x.data)
assert compression == "lz4"
assert len(payload) < x.nbytes * 0.75
@pytest.mark.parametrize("serializers", [("dask",), ("cuda",)])
def test_preserve_header(serializers):
"""
Test that a serialization family doesn't overwrite the headers
of the underlying registered dumps/loads functions.
"""
class MyObj:
pass
@cuda_serialize.register(MyObj)
@dask_serialize.register(MyObj)
def _(x):
return {}, []
@cuda_deserialize.register(MyObj)
@dask_deserialize.register(MyObj)
def _(header, frames):
assert header == {}
assert frames == []
return MyObj()
header, frames = serialize(MyObj(), serializers=serializers)
o = deserialize(header, frames)
assert isinstance(o, MyObj)
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