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lightning/libwally-core/README.md

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libwally-core

Wally is a collection of useful primitives for cryptocurrency wallets.

Note that the library is currently pre-release and so the API may change without notice.

Please report bugs and submit patches to https://github.com/jgriffiths/libwally-core.

Build Status

Platforms

Wally currently builds on all linux and OSX platforms as well as all supported Android NDK targets. Bindings for Python and Java are included.

Windows support and further language bindings such as JavaScript are planned.

Building

$ ./tools/autogen.sh
$ ./configure <options - see below>
$ make
$ make check

configure options

  • --enable-debug. Enables debugging information and disables compiler optimisations (default: no).
  • --enable-export-all. Export all functions from the wally shared library. Ordinarily only API functions are exported. (default: no). Enable this if you want to test the internal functions of the library or are planning to submit patches.
  • --enable-swig-python. Enable the SWIG Python interface. The resulting shared library can be imported from Python using the generated interface file src/swig_python/wallycore/wallycore.py. (default: no).
  • --enable-swig-java. Enable the SWIG Java (JNI) interface. After building, see src/swig_java/src/com/blockstream/libwally/Wally.java for the Java interface definition (default: no).
  • --enable-coverage. Enables code coverage (default: no) Note that you will need lcov installed to build with this option enabled and generate coverage reports.

NOTE: If you wish to run the Python tests you currently need to pass the --enable-swig-python option. This requirement will be removed in a future version.

Recommended development configure options

$ ./configure --enable-debug --enable-export-all --enable-swig-python --enable-coverage

Python

For python development, you can build and install wally using:

$ python setup.py install

It is suggested you only install this way into a virtualenv while the library is under heavy development.

Cleaning

$ ./tools/cleanup.sh

Submitting patches

Please use pull requests on github to submit. Before producing your patch you should format your changes using uncrustify version 0.60 or later. The script ./tools/uncrustify will reformat all C sources in the library as needed, with the currently chosen uncrustify options.

The version of uncrustify in Debian is unfortunately out of date and buggy. If you are using Debian this means you will need to download and build uncrustify from source using something like:

$ git clone --depth 1 https://github.com/uncrustify/uncrustify.git
$ cd uncrustify
$ ./autogen.sh
$ ./configure
$ make
$ sudo make install

You should also make sure the existing tests pass and if possible write tests covering any new functionality, following the existing style.

Generating a coverage report

To generate an HTML coverage report, use:

$ ./tools/cleanup.sh
$ ./tools/autogen.sh
$ ./configure --enable-debug --enable-export-all --enable-swig-python --enable-swig-java --enable-coverage
$ make
$ ./tools/coverage.sh clean
$ make check
$ ./tools/coverage.sh

The coverage report can then be viewed at src/lcov/index.html. Patches to increase the test coverage are welcome.