msgpack-python/test/test_limits.py at main · msgpack/msgpack-python · GitHub

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#!/usr/bin/env python

import sysconfig

import tracemalloc

import pytest

from msgpack import (

ExtType,

OutOfData,

Packer,

PackOverflowError,

PackValueError,

Unpacker,

UnpackValueError,

packb,

unpackb,

)

def test_integer():

x = -(2**63)

assert unpackb(packb(x)) == x

with pytest.raises(PackOverflowError):

packb(x - 1)

x = 2**64 - 1

assert unpackb(packb(x)) == x

with pytest.raises(PackOverflowError):

packb(x + 1)

def test_single_float():

x = 3.4028234663852886e38 # FLT_MAX

assert unpackb(packb(x, use_single_float=True)) == x

with pytest.raises(PackOverflowError):

packb(x * 2, use_single_float=True)

# Infinities are representable in single precision, so they must not raise.

for x in (float("inf"), float("-inf")):

assert unpackb(packb(x, use_single_float=True)) == x

def test_array_header():

packer = Packer()

packer.pack_array_header(2**32 - 1)

with pytest.raises(PackValueError):

packer.pack_array_header(2**32)

def test_map_header():

packer = Packer()

packer.pack_map_header(2**32 - 1)

with pytest.raises(PackValueError):

packer.pack_array_header(2**32)

@pytest.mark.parametrize("method", ["pack_array_header", "pack_map_header"])

@pytest.mark.parametrize("size", [-1, -(2**32)])

def test_negative_header_size(method, size):

packer = Packer(autoreset=False)

packer.pack("existing")

with pytest.raises(PackValueError, match="size must be non-negative"):

getattr(packer, method)(size)

assert packer.bytes() == packb("existing")

def test_max_str_len():

d = "x" * 3

packed = packb(d)

unpacker = Unpacker(max_str_len=3, raw=False)

unpacker.feed(packed)

assert unpacker.unpack() == d

unpacker = Unpacker(max_str_len=2, raw=False)

with pytest.raises(UnpackValueError):

unpacker.feed(packed)

unpacker.unpack()

def test_max_bin_len():

d = b"x" * 3

packed = packb(d, use_bin_type=True)

unpacker = Unpacker(max_bin_len=3)

unpacker.feed(packed)

assert unpacker.unpack() == d

unpacker = Unpacker(max_bin_len=2)

with pytest.raises(UnpackValueError):

unpacker.feed(packed)

unpacker.unpack()

def test_max_array_len():

d = [1, 2, 3]

packed = packb(d)

unpacker = Unpacker(max_array_len=3)

unpacker.feed(packed)

assert unpacker.unpack() == d

unpacker = Unpacker(max_array_len=2)

with pytest.raises(UnpackValueError):

unpacker.feed(packed)

unpacker.unpack()

def test_max_map_len():

d = {1: 2, 3: 4, 5: 6}

packed = packb(d)

unpacker = Unpacker(max_map_len=3, strict_map_key=False)

unpacker.feed(packed)

assert unpacker.unpack() == d

unpacker = Unpacker(max_map_len=2, strict_map_key=False)

with pytest.raises(UnpackValueError):

unpacker.feed(packed)

unpacker.unpack()

@pytest.mark.parametrize("size", [9999, 10000, 10001, 20001])

@pytest.mark.parametrize("use_list", [False, True])

def test_array_preallocation_boundary(size, use_list):

value = list(range(size))

expected = value if use_list else tuple(value)

packed = packb(value)

assert unpackb(packed, use_list=use_list, list_hook=lambda obj: obj) == expected

unpacker = Unpacker(use_list=use_list)

# Suspend after crossing the preallocation boundary.

unpacker.feed(packed[:-1])

with pytest.raises(OutOfData):

unpacker.unpack()

unpacker.feed(packed[-1:])

assert unpacker.unpack() == expected

@pytest.mark.parametrize("size", [9999, 10000, 10001, 20001])

def test_pairs_preallocation_boundary(size):

value = {str(i): i for i in range(size)}

expected = list(value.items())

packed = packb(value)

assert unpackb(packed, object_pairs_hook=list) == expected

unpacker = Unpacker(object_pairs_hook=list)

unpacker.feed(packed[:-1])

with pytest.raises(OutOfData):

unpacker.unpack()

unpacker.feed(packed[-1:])

assert unpacker.unpack() == expected

@pytest.mark.parametrize("kind", ["list", "tuple", "pairs"])

@pytest.mark.thread_unsafe(reason="tracemalloc changes process-wide state and measures all threads")

def test_nested_headers_preallocation(kind):

packer = Packer()

header = (

packer.pack_map_header(100_000) if kind == "pairs" else packer.pack_array_header(100_000)

)

unpacker = Unpacker(

use_list=kind != "tuple", object_pairs_hook=list if kind == "pairs" else None

)

# Map headers nest in key position, so no completed pairs are needed.

unpacker.feed(header * 16)

already_tracing = tracemalloc.is_tracing()

tracemalloc.start()

try:

before = tracemalloc.get_traced_memory()[0]

with pytest.raises(OutOfData):

unpacker.unpack()

# Full preallocation would retain over 12 MB in the C unpacker.

assert tracemalloc.get_traced_memory()[0] - before < 4 * 1024 * 1024

finally:

if not already_tracing:

tracemalloc.stop()

def test_max_ext_len():

d = ExtType(42, b"abc")

packed = packb(d)

unpacker = Unpacker(max_ext_len=3)

unpacker.feed(packed)

assert unpacker.unpack() == d

unpacker = Unpacker(max_ext_len=2)

with pytest.raises(UnpackValueError):

unpacker.feed(packed)

unpacker.unpack()

# PyPy fails following tests because of constant folding?

# https://bugs.pypy.org/issue1721

# @pytest.mark.skipif(True, reason="Requires very large memory.")

# def test_binary():

# x = b'x' * (2**32 - 1)

# assert unpackb(packb(x)) == x

# del x

# x = b'x' * (2**32)

# with pytest.raises(ValueError):

# packb(x)

# @pytest.mark.skipif(True, reason="Requires very large memory.")

# def test_string():

# x = 'x' * (2**32 - 1)

# assert unpackb(packb(x)) == x

# x += 'y'

# with pytest.raises(ValueError):

# packb(x)

# @pytest.mark.skipif(True, reason="Requires very large memory.")

# def test_array():

# x = [0] * (2**32 - 1)

# assert unpackb(packb(x)) == x

# x.append(0)

# with pytest.raises(ValueError):

# packb(x)

# auto max len

def test_auto_max_array_len():

packed = b"\xde\x00\x06zz"

with pytest.raises(UnpackValueError):

unpackb(packed, raw=False)

unpacker = Unpacker(max_buffer_size=5, raw=False)

unpacker.feed(packed)

with pytest.raises(UnpackValueError):

unpacker.unpack()

# Skip on free-threaded CPython builds because this test depends on recursion behavior.

IS_FREE_THREADED_BUILD = bool(sysconfig.get_config_var("Py_GIL_DISABLED"))

@pytest.mark.skipif(IS_FREE_THREADED_BUILD, reason="Skipped on free-threaded build")

@pytest.mark.thread_unsafe

def test_nest_limit_1024():

import sys

# Build a list nested 1024 levels deep

d = None

for _ in range(1024):

d = [d]

# Temporarily raise Python's recursion limit so packing 1024 levels succeeds

old_limit = sys.getrecursionlimit()

sys.setrecursionlimit(max(old_limit, 30000))

try:

packed = packb(d)

result = unpackb(packed)

finally:

sys.setrecursionlimit(old_limit)

# Verify structure iteratively to avoid hitting C-level recursion limit in ==

for _ in range(1024):

assert isinstance(result, list) and len(result) == 1

result = result[0]

assert result is None

def test_auto_max_map_len():

# len(packed) == 6 -> max_map_len == 3

packed = b"\xde\x00\x04zzz"

with pytest.raises(UnpackValueError):

unpackb(packed, raw=False)

unpacker = Unpacker(max_buffer_size=6, raw=False)

unpacker.feed(packed)

with pytest.raises(UnpackValueError):

unpacker.unpack()

msgpack-python/test/test_limits.py at main · msgpack/msgpack-python · GitHub

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