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Raise DEFAULT_RECURSE_LIMIT from 511 to 1024 by Copilot · Pull Request #676 · msgpack/msgpack-python · GitHub
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Raise DEFAULT_RECURSE_LIMIT from 511 to 1024 #676

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Merged
methane merged 3 commits into from
May 22, 2026
Merged

Raise DEFAULT_RECURSE_LIMIT from 511 to 1024 #676

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8bdc6c2
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Copilot May 20, 2026
3e1ab43
Change DEFAULT_RECURSE_LIMIT from 511 to 1024 and add nest_limit test
Copilot May 20, 2026
30e46c8
Fix test_nest_limit_1024: use iterative comparison to avoid C-level r…
Copilot May 20, 2026
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2 changes: 1 addition & 1 deletion msgpack/_packer.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ cdef extern from "pack.h":
int msgpack_pack_timestamp(msgpack_packer* x, long long seconds, unsigned long nanoseconds) except -1


cdef int DEFAULT_RECURSE_LIMIT=511
cdef int DEFAULT_RECURSE_LIMIT=1024
cdef long long ITEM_LIMIT = (2**32)-1


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2 changes: 1 addition & 1 deletion msgpack/fallback.py
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Expand Up @@ -52,7 +52,7 @@ def newlist_hint(size):
TYPE_BIN = 4
TYPE_EXT = 5

DEFAULT_RECURSE_LIMIT = 511
DEFAULT_RECURSE_LIMIT = 1024


def _check_type_strict(obj, t, type=type, tuple=tuple):
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18 changes: 18 additions & 0 deletions test/test_limits.py
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Expand Up @@ -153,6 +153,24 @@ def test_auto_max_array_len():
unpacker.unpack()


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, 10000))
try:
packed = packb(d)
assert unpackb(packed) == d

@methane methane May 20, 2026

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@copilot この == が インタプリタ内部の recursion limit に当たってRuntimeErrorになるんだ。これはCレベルの制限だから sys.setrecursionlimit() では対策できない。

json.dumps(packed) == json.dumps(d) にしてくれる？もしくは他にいいやり方があったら提案お願い。

Copilot AI May 20, 2026

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Fixed in 30e46c8. Instead of using == (which recurses through the 1024-level structure at C level), the test now iteratively unwraps the result one level at a time and asserts structure/type at each step, avoiding any deep recursion in the comparison.

finally:
sys.setrecursionlimit(old_limit)


def test_auto_max_map_len():
# len(packed) == 6 -> max_map_len == 3
packed = b"\xde\x00\x04zzz"
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