88 lines
3.8 KiB
Markdown
88 lines
3.8 KiB
Markdown
# toxygen_wrapper
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[ctypes](https://docs.python.org/3/library/ctypes.html)
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wrapping of [Tox](https://tox.chat/)
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[```libtoxcore```](https://github.com/TokTok/c-toxcore) into Python.
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Taken from the ```wrapper``` directory of the now abandoned
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<https://github.com/toxygen-project/toxygen> ```next_gen``` branch
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by Ingvar.
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The basics of NGC groups are supported, as well as AV and toxencryptsave.
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There is no coverage of conferences as they are not used in ```toxygen```
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and the list of still unwrapped calls as of Sept. 2022 can be found in
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```tox.c-toxcore.missing```. The code still needs double-checking
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that every call in ```tox.py``` has the right signature, but it runs
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```toxygen``` with no apparent issues.
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It has been tested with UDP and TCP proxy (Tor). It has ***not*** been
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tested on Windows, and there may be some minor breakage, which should be
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easy to fix. There is a good coverage integration testsuite in ```wrapper_tests```.
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Change to that directory and run ```tests_wrapper.py --help```; the test
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suite gives a good set of examples of usage.
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## Install
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Put the parent of the wrapper directory on your PYTHONPATH and
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touch a file called `__init__.py` in its parent directory.
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Then you need a ```libs``` directory beside the `wrapper` directory
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and you need to link your ```libtoxcore.so``` and ```libtoxav.so```
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and ```libtoxencryptsave.so``` into it. Link all 3 filenames
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to ```libtoxcore.so``` if you have only ```libtoxcore.so```
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(which is usually the case if you built ```c-toxcore``` with ```cmake```
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rather than ```autogen/configure```). If you want to be different,
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the environment variable TOXCORE_LIBS overrides the location of ```libs```.
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As is, the code in ```tox.py``` is very verbose. Edit the file to change
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```
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def LOG_ERROR(a): print('EROR> '+a)
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def LOG_WARN(a): print('WARN> '+a)
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def LOG_INFO(a): print('INFO> '+a)
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def LOG_DEBUG(a): print('DBUG> '+a)
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def LOG_TRACE(a): pass # print('TRAC> '+a)
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```
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to all ```pass #``` or use ```logging.logger``` to suite your tastes.
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```logging.logger``` can be dangerous in callbacks in ```Qt``` applications,
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so we use simple print statements as default. The same applies to
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```wrapper/tests_wrapper.py```.
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## Prerequisites
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No prerequisites in Python3.
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## Other wrappers
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There are a number of other wrappings into Python of Tox core.
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This one uses [ctypes](https://docs.python.org/3/library/ctypes.html)
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which has its merits - there is no need to recompile anything as with
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Cython - change the Python file and it's done. And you can follow things
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in a Python debugger, or with the utterly stupendous Python feature of
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```gdb``` (```gdb -ex r --args /usr/bin/python3.9 <pyfile>```).
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CTYPES code can be brittle, segfaulting if you've got things wrong,
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but if your wrapping is right, it is very efficient and easy to work on.
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The [faulthandler](https://docs.python.org/3/library/faulthandler.html)
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module can be helpful in debugging crashes
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(e.g. from segmentation faults produced by erroneous C library wrapping).
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Others include:
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* <https://github.com/TokTok/py-toxcore-c> Cython bindings.
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Incomplete and not really actively supported. Maybe it will get
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worked on in the future, but TokTok seems to be working on
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java, rust, scalla, go, etc. bindings instead.
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No support for NGC groups or toxencryptsave.
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* <https://github.com/oxij/PyTox>
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forked from https://github.com/aitjcize/PyTox
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by Wei-Ning Huang <aitjcize@gmail.com>.
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Hardcore C wrapping which is not easy to keep up to date.
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No support for NGC or toxencryptsave. Abandonned.
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This was the basis for the TokTok/py-toxcore-c code until recently.
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To our point of view, the ability of CTYPEs to follow code in the
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debugger is a crucial advantage.
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Work on this project is suspended until the
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[MultiDevice](https://git.plastiras.org/emdee/tox_profile/wiki/MultiDevice-Announcements-POC) problem is solved. Fork me!
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