Error when running Python tests 'No such node (gammaABC)'

[HarryR]

Raised in #4 by @uivlis

* G1 elements in proof: 2
* G2 elements in proof: 1
* Proof size in bits: 1019
terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::property_tree::ptree_bad_path> >'
  what():  No such node (gammaABC)
Aborted
make[1]: *** [test] Error 134
make[1]: Leaving directory `/home/ubuntu/workspace/python'
make: *** [python-test] Error 2

Presumably originates from:

• https://github.com/HarryR/ethsnarks-miximus/blob/master/python/miximus.py#L119
• https://github.com/HarryR/ethsnarks-miximus/blob/master/python/test/test_miximus.py#L44

The Python code passes a JSON blob to the native verifier containing the verification key.

Two ways to debug this would be:

1. In https://github.com/HarryR/ethsnarks-miximus/blob/master/python/miximus.py#L116 add a print statement for self._vk.to_json().encode('ascii')
2. In https://github.com/HarryR/ethsnarks-miximus/blob/master/circuit/miximus.cpp#L314 add a print statement for vk_json

This would verify that the JSON is in the correct format in Python, and verify that it's being received correctly by the C++ library.

He said the first error he ran into was:
TypeError: the JSON object must be str, not 'bytes' in line 110 from miximus.py. I changed

return Proof.from_json(data)

into

return Proof.from_json(data.decode('ascii'))

[HarryR]

In #10 I have made it easy to build the project on Amazon Cloid9 using the default Amazon Linux AMI (Redhat based, cmake 2.8).

I'm unable to reproduce the problem described above, Python tests run.

[HarryR]

I have added appveyor.yml to the project, so it's now being built on Windows, see: https://ci.appveyor.com/project/harryr/ethsnarks-miximus/builds/22548437

There has been no testing on windows though.