As some of you may have already heard, I am working on Mimblewimble implementation in Python. The library already provides some useful functionalities, but it is far from ready.
Current obstacle is access to secp256k1-zkp methods. We have our own fork of secp256k1-zkp library and the way it is used in Rust is via a wrapper.
I am writing a similar wrapper for Python. I have already wrapped some methods, it builds and those methods are accessible using Python. Unfortunately, I am not fluent with C and my work on it is very inefficient. I have prepared a necessary setup to get started
Basically one needs to help me write more definitions in deps.c in a way to avoid type errors during compilation I keep getting. The repo contains everything you need to get started with, once we have the definitions and everything builds (not just few methods I prepared to get started) I will make a Python module out of it and publish it and integrate it with mimblewimble-py.
I also hope ツ Community Council could offer a bounty for someone who is willing to help.
Please leave your feedback!
Cheers!
Really hard to tell, it depends on experience… My suggestion is:
Offer a flat rate prize and state this is assuming X hours of work are needed.
Make it clear that if in the process the problem ends up more challenging the extra time will also be compensated as long as sufficiently documented and there are traces of work over time (GitHub, questions on the forum / keybase etc).
I’m interested in working on this one, will fork it tonight and have a look to see what is happening. Do you have a branch that has the problem with the compilation errors?
and you will start getting parsing errors, type errors etc
Traceback (most recent call last):
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/cffi/cparser.py", line 336, in _parse
ast = _get_parser().parse(fullcsource)
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/pycparser/c_parser.py", line 152, in parse
debug=debuglevel)
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/pycparser/ply/yacc.py", line 331, in parse
return self.parseopt_notrack(input, lexer, debug, tracking, tokenfunc)
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/pycparser/ply/yacc.py", line 1199, in parseopt_notrack
tok = call_errorfunc(self.errorfunc, errtoken, self)
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/pycparser/ply/yacc.py", line 193, in call_errorfunc
r = errorfunc(token)
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/pycparser/c_parser.py", line 1861, in p_error
column=self.clex.find_tok_column(p)))
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/pycparser/plyparser.py", line 67, in _parse_error
raise ParseError("%s: %s" % (coord, msg))
pycparser.plyparser.ParseError: <cdef source string>:57:5: before: secp256k1_pubkey
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "build.py", line 51, in <module>
ffi.cdef(_source)
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/cffi/api.py", line 112, in cdef
self._cdef(csource, override=override, packed=packed, pack=pack)
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/cffi/api.py", line 126, in _cdef
self._parser.parse(csource, override=override, **options)
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/cffi/cparser.py", line 389, in parse
self._internal_parse(csource)
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/cffi/cparser.py", line 394, in _internal_parse
ast, macros, csource = self._parse(csource)
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/cffi/cparser.py", line 338, in _parse
self.convert_pycparser_error(e, csource)
File "/Users/marek/.pyenv/versions/3.7.4/Python.framework/Versions/3.7/lib/python3.7/site-packages/cffi/cparser.py", line 367, in convert_pycparser_error
raise CDefError(msg)
cffi.CDefError: cannot parse "secp256k1_pubkey* pubkey,"
<cdef source string>:57:5: before: secp256k1_pubkey
@renzokuken,@walkbackgod,@Cobragrin
The bounty proposed in Tuesdays 13th of September’s CC meeting has officially been approved by the CC members:
Bounty for a Python cffi secp256k1-zkp wrapper
-3000$ bounty for significant progress
-10.000$ (includes the $3000) for the finished, well documented and well tested wrapper. MIT license open source, or if possible with the wrapped package, Apache license are required.
We now lock the bounty for you to work on this project @walkbackgod. Keep us informed on your estimate timeline and any progress.
OK have forked and managed to get through one set of errors.
I expect to spend some hours on this later today, will let you guys know how going in next few days.
As you can see from the repo, I completed the first bit a while ago which was to get all the methods from the mw fork working and building. I am working on the next bit which is definitely harder. Trying to get the other methods working… Once i get past the first few it may become easier, but right now it’s difficult. @renzokuken not sure if you want to check the current repo to make sure you are happy with what is there right now?
Thank you! I will do my best to review your code before October 7th, 2022. I am currently travelling for business and it is difficult for me to find a time slot, but I acknowledge I received your request and I added this review to my current TODO list.
Terribly sorry for the delays. @walkbackgod I just added your remote and build from the branch wbg-pythonwrapper. Build properly and without errors. Since I left this project and applied for the funding the bounty you added these following methods:
