NameError: name '_cast_uint32_native' is not defined

[konyshev-dmitry]

Using Bleak to fetch Bluetooth Low Energy (BLE) devices.

Versions of dbus-fast <=1.50.0 are working fine.
Versions of dbus-fast >=1.51.0 give:
File "/home/d/.local/lib/python3.11/site-packages/dbus_fast/_private/unmarshaller.py", line 434, in _read_header self._body_len = _cast_uint32_native(self._buf, 4) # pragma: no cover ^^^^^^^^^^^^^^^^^^^ NameError: name '_cast_uint32_native' is not defined

Ubuntu 20.04.5 (amd64 and aarch64), Python 3.8-3.11

[bdraco]

We don’t have python 3.11 support yet, but your post implies you have the issue on other versions as well.

Can you post the trace from 3.10/3.9/3.8?

[konyshev-dmitry]

$ python3.8 --version
Python 3.8.10

$ python3.8 blu.py
Traceback (most recent call last):
  File "blu.py", line 9, in <module>
    asyncio.run(main())
  File "/usr/lib/python3.8/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
    return future.result()
  File "blek.py", line 5, in main
    devices = await BleakScanner.discover()
  File "/home/d/.local/lib/python3.8/site-packages/bleak/__init__.py", line 216, in discover
    async with cls(**kwargs) as scanner:
  File "/home/d/.local/lib/python3.8/site-packages/bleak/__init__.py", line 126, in __aenter__
    await self._backend.start()
  File "/home/d/.local/lib/python3.8/site-packages/bleak/backends/bluezdbus/scanner.py", line 174, in start
    manager = await get_global_bluez_manager()
  File "/home/d/.local/lib/python3.8/site-packages/bleak/backends/bluezdbus/manager.py", line 891, in get_global_bluez_manager
    await instance.async_init()
  File "/home/d/.local/lib/python3.8/site-packages/bleak/backends/bluezdbus/manager.py", line 191, in async_init
    await bus.connect()
  File "/home/d/.local/lib/python3.8/site-packages/dbus_fast/aio/message_bus.py", line 230, in connect
    return await future
  File "/home/d/.local/lib/python3.8/site-packages/dbus_fast/aio/message_bus.py", line 209, in on_hello
    raise err
  File "/home/d/.local/lib/python3.8/site-packages/dbus_fast/aio/message_reader.py", line 22, in _message_reader
    message = unmarshall()
  File "/home/d/.local/lib/python3.8/site-packages/dbus_fast/_private/unmarshaller.py", line 615, in unmarshall
    self._read_header()
  File "/home/d/.local/lib/python3.8/site-packages/dbus_fast/_private/unmarshaller.py", line 527, in _read_header
    self._body_len = _cast_uint32_native(self._buf, 4)  # pragma: no cover
NameError: name '_cast_uint32_native' is not defined

$ pip list
Package             Version
------------------- --------------------
async-timeout       4.0.2
bcrypt              3.1.7
bleak               0.19.1
blinker             1.4
Brlapi              0.7.0
certifi             2019.11.28
chardet             3.0.4
Click               7.0
colorama            0.4.3
cryptography        2.8
cupshelpers         1.0
dbus-fast           1.59.1
dbus-next           0.2.3
dbus-python         1.2.16
defer               1.0.6
distro              1.4.0
distro-info         0.23ubuntu1
duplicity           0.8.12.0
entrypoints         0.3
fasteners           0.14.1
future              0.18.2
gpg                 1.13.1-unknown
httplib2            0.14.0
idna                2.8
keyring             18.0.1
launchpadlib        1.10.13
lazr.restfulclient  0.14.2
lazr.uri            1.0.3
lockfile            0.12.2
louis               3.12.0
macaroonbakery      1.3.1
Mako                1.1.0
MarkupSafe          1.1.0
monotonic           1.5
netifaces           0.10.4
oauthlib            3.1.0
olefile             0.46
paramiko            2.6.0
pexpect             4.6.0
Pillow              7.0.0
pip                 22.3
protobuf            3.6.1
pycairo             1.16.2
pycrypto            2.6.1
pycups              1.9.73
PyGObject           3.36.0
PyJWT               1.7.1
pymacaroons         0.13.0
PyNaCl              1.3.0
pyRFC3339           1.1
python-apt          2.0.0+ubuntu0.20.4.8
python-dateutil     2.7.3
python-debian       0.1.36ubuntu1
pytz                2019.3
pyxdg               0.26
PyYAML              5.3.1
reportlab           3.5.34
requests            2.22.0
requests-unixsocket 0.2.0
SecretStorage       2.3.1
setuptools          45.2.0
simplejson          3.16.0
six                 1.14.0
ssh-import-id       5.10
systemd-python      234
typing_extensions   4.4.0
ufw                 0.36
urllib3             1.25.8
usb-creator         0.3.7
wadllib             1.3.3
wheel               0.34.2
xkit                0.0.0

$ dpkg --status bluez | grep '^Version:'
Version: 5.53-0ubuntu3.6

Using standard Bleak example code:

import asyncio
from bleak import BleakScanner

async def main():
    devices = await BleakScanner.discover()
    for d in devices:
        print(d)

asyncio.run(main())

[bdraco]

Are you using the wheels from PyPI or building for source?

Is the cython extension being compiled or are you running pure python only?

[bdraco]

Pushed 1.59.2

Please let me know if that resolves it for you

[bdraco]

It will take 10-15 minutes before wheels are uploaded
https://github.com/Bluetooth-Devices/dbus-fast/actions/runs/3360664409

[konyshev-dmitry]

Thanks, the issue is resolved.

And thanks again, it was really [dbus-]fast!

[bdraco]

1.61.0 has python 3.11 support