libuniffi_c2pa.so: undefined symbol: uniffi_c2pa_fn_free_reader

[sohams98]

Hey Everyone,
The latest 0.8.0 release seems to have broken C bindings for this package. I am facing issues when installing and using the latest version from pypi.

The redacted traceback for the error I am facing is detailed below.

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/gunicorn/arbiter.py", line 608, in spawn_worker
    worker.init_process()
  File "/usr/local/lib/python3.10/site-packages/gunicorn/workers/ggevent.py", line 146, in init_process
    super().init_process()
  File "/usr/local/lib/python3.10/site-packages/gunicorn/workers/base.py", line 135, in init_process
    self.load_wsgi()
  File "/usr/local/lib/python3.10/site-packages/gunicorn/workers/base.py", line 147, in load_wsgi
    self.wsgi = self.app.wsgi()
  File "/usr/local/lib/python3.10/site-packages/gunicorn/app/base.py", line 66, in wsgi
    self.callable = self.load()
  File "/usr/local/lib/python3.10/site-packages/gunicorn/app/wsgiapp.py", line 57, in load
    return self.load_wsgiapp()
  File "/usr/local/lib/python3.10/site-packages/gunicorn/app/wsgiapp.py", line 47, in load_wsgiapp
    return util.import_app(self.app_uri)
  File "/usr/local/lib/python3.10/site-packages/gunicorn/util.py", line 370, in import_app
    mod = importlib.import_module(module)
  File "/usr/local/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/usr/src/app/wsgi.py", line 1, in <module>
    from <redacted> import handler
  File "<redacted>", line 18, in <module>
    from <redacted> import <redacted>
  File "<redacted>/c2pa_service.py", line 1, in <module>
    import c2pa
  File "/usr/local/lib/python3.10/site-packages/c2pa/__init__.py", line 1, in <module>
    from .c2pa import *  # NOQA
  File "/usr/local/lib/python3.10/site-packages/c2pa/c2pa.py", line 570, in <module>
    _UniFFILib.uniffi_c2pa_fn_free_reader.argtypes = (
  File "/usr/local/lib/python3.10/ctypes/__init__.py", line 387, in __getattr__
    func = self.__getitem__(name)
  File "/usr/local/lib/python3.10/ctypes/__init__.py", line 392, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: /usr/local/lib/python3.10/site-packages/c2pa/libuniffi_c2pa.so: undefined symbol: uniffi_c2pa_fn_free_reader

The core error is AttributeError: /usr/local/lib/python3.10/site-packages/c2pa/libuniffi_c2pa.so: undefined symbol: uniffi_c2pa_fn_free_reader

Downgrading to 0.6.1 solves this issue.

[tmathern]

Thank you for the report. We just published a v0.9.0. Would you mind checking that one out, and report if the issue is still there or fixed?

[sohams98]

I am still facing this issue.

Minimal reproducible code sample

Open a terminal

pip install c2pa-python==0.9.0

Start python in this terminal, import c2pa.

The error still persists.

For context, I have tried this in both WSL and a docker image with Rust installed.

[dienhoa]

I confirm having the same problem.

Reverting back to version 0.8.3 works fine (but this version is noted as yanked on pypi, not sure which feature doesn't work)

[ilic5000]

Same problem here. Reverting back to 0.6.1 works for now.

[rokclimb15]

Confirmed, same issue

[atlas-editor]

same issue on 0.9.0

added: replicated in docker environment using image python:3.12-slim-bookworm, got the error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.12/site-packages/c2pa/__init__.py", line 14, in <module>
    from .c2pa_api import (
  File "/usr/local/lib/python3.12/site-packages/c2pa/c2pa_api/__init__.py", line 1, in <module>
    from .c2pa_api import *
  File "/usr/local/lib/python3.12/site-packages/c2pa/c2pa_api/c2pa_api.py", line 25, in <module>
    import c2pa.c2pa as api
  File "/usr/local/lib/python3.12/site-packages/c2pa/c2pa/__init__.py", line 1, in <module>
    from .c2pa import *  # NOQA
    ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/c2pa/c2pa/c2pa.py", line 570, in <module>
    _UniFFILib.uniffi_c2pa_fn_free_reader.argtypes = (
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/ctypes/__init__.py", line 392, in __getattr__
    func = self.__getitem__(name)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/ctypes/__init__.py", line 397, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: /usr/local/lib/python3.12/site-packages/c2pa/c2pa/libuniffi_c2pa.so: undefined symbol: uniffi_c2pa_fn_free_reader

[tmathern]

Update: We're currently working on totally removing the uniffi layer, which should solve this (currently work-in-progress, not ready yet).

[gwudakar]

@tmathern, is there any version of python with which the uniffi layer will work in the interim? No work around?

[tmathern]

@gwudakar I see some people downgraded to 0.6.1 (=> #101 (comment)), but that means you would loose some functionality/bug fixes from the later version, unfortunately.

[dienhoa]

@gwudakar While waiting for the next version of c2pa-python, we (Sightengine) have developed a simple Python wrapper for c2pa-rs using PyO3.

If you only need to read C2PA metadata, you can use this package. It doesn't support writing for now, as we currently don’t need that

It's also faster than c2pa-python in our tests (maybe thanks to PyO3 instead of uniffi)

Repo: https://github.com/Sightengine/fast_c2pa_python

---

P.S. I’m not trying to pull users away from c2pa-python. Just wanted to share an alternative for those who need a quick solution while waiting for the next c2pa-python version, which I believe will be much better, especially with the rewrite and removal of uniffi that you seem to be working on.

[tmathern]

We've released v0.10.0 which should fix the issue, as long as you're on an architecture that is natively supported.

https://github.com/contentauth/c2pa-python/releases/tag/v0.10.0 | https://pypi.org/project/c2pa-python/0.10.0/
(I verified the builds with a small example from here).