msgpack-python/test/test_except.py

#!/usr/bin/env python

import datetime

from pytest import raises

from msgpack import ExtType, FormatError, OutOfData, StackError, Unpacker, packb, unpackb


class DummyException(Exception):
    pass


def test_raise_on_find_unsupported_value():
    with raises(TypeError):
        packb(datetime.datetime.now())


def test_raise_from_object_hook():
    def hook(obj):
        raise DummyException

    raises(DummyException, unpackb, packb({}), object_hook=hook)
    raises(DummyException, unpackb, packb({"fizz": "buzz"}), object_hook=hook)
    raises(DummyException, unpackb, packb({"fizz": "buzz"}), object_pairs_hook=hook)
    raises(DummyException, unpackb, packb({"fizz": {"buzz": "spam"}}), object_hook=hook)
    raises(
        DummyException,
        unpackb,
        packb({"fizz": {"buzz": "spam"}}),
        object_pairs_hook=hook,
    )


def test_raise_from_list_hook():
    def hook(lst: list) -> list:
        raise DummyException

    with raises(DummyException):
        unpackb(packb([1, 2, 3]), list_hook=hook)

    with raises(DummyException):
        unpacker = Unpacker(list_hook=hook)
        unpacker.feed(packb([1, 2, 3]))
        unpacker.unpack()


def test_raise_from_ext_hook():
    def hook(code: int, data: bytes) -> ExtType:
        raise DummyException

    packed = packb(ExtType(42, b"hello"))

    with raises(DummyException):
        unpackb(packed, ext_hook=hook)

    with raises(DummyException):
        unpacker = Unpacker(ext_hook=hook)
        unpacker.feed(packed)
        unpacker.unpack()


def test_invalidvalue():
    incomplete = b"\xd9\x97#DL_"  # raw8 - length=0x97
    with raises(ValueError):
        unpackb(incomplete)

    with raises(OutOfData):
        unpacker = Unpacker()
        unpacker.feed(incomplete)
        unpacker.unpack()

    with raises(FormatError):
        unpackb(b"\xc1")  # (undefined tag)

    with raises(FormatError):
        unpackb(b"\x91\xc1")  # fixarray(len=1) [ (undefined tag) ]

    with raises(StackError):
        unpackb(b"\x91" * 3000)  # nested fixarray(len=1)


def test_strict_map_key():
    valid = {"unicode": 1, b"bytes": 2}
    packed = packb(valid, use_bin_type=True)
    assert valid == unpackb(packed, raw=False, strict_map_key=True)

    invalid = {42: 1}
    packed = packb(invalid, use_bin_type=True)
    with raises(ValueError):
        unpackb(packed, raw=False, strict_map_key=True)


def test_strict_map_key_with_object_pairs_hook():
    # strict_map_key should be enforced even when object_pairs_hook is set
    invalid = {42: "value"}
    packed = packb(invalid, use_bin_type=True)
    with raises(ValueError):
        unpackb(packed, raw=False, strict_map_key=True, object_pairs_hook=list)

    # valid keys (str/bytes) should still work with object_pairs_hook
    valid = {"key": "value"}
    packed = packb(valid, use_bin_type=True)
    result = unpackb(packed, raw=False, strict_map_key=True, object_pairs_hook=list)
    assert result == [("key", "value")]