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Universal Binary JSON encoder/decoder

Project description

Overview

This is a Python v3.2+ (and 2.7+) Universal Binary JSON encoder/decoder based on the draft-12 specification.

Installing / packaging

# To get from PyPI
pip3 install py-ubjson

# To only build extension modules inline (e.g. in repository)
python3 setup.py build_ext -i

# To build & install globally
python3 setup.py install

# To skip building of extensions when installing (or building)
PYUBJSON_NO_EXTENSION=1 python3 setup.py install

Notes

  • The (cython-generated) extension modules are not required but provide a significant speed boost.
  • The above can also be run with v2.7+
  • PyPI releases are signed with the Iotic Labs Software release signing key
  • If any .py or .pxd has been modified, cythongenerate.sh_ has to be run first
  • At run time, one can check whether compiled version is in use via the ubjson.EXTENSIONENABLED_ boolean

Usage

It’s meant to behave very much like Python’s built-in JSON module, e.g.:

import ubjson

encoded = ubjson.dumpb({u'a': 1})

decoded = ubjson.loadb(encoded)

Note: Only unicode strings in Python 2 will be encoded as strings, plain str will be encoded as a byte array.

Documentation

import ubsjon
help(ubjson.dump)
help(ubjson.load)

Command-line utility

This converts between JSON and UBJSON formats:

python3 -mubjson
USAGE: ubjson (fromjson|tojson) (INFILE|-) [OUTFILE]

Tests

Static

This library has been checked using flake8 and pylint, using a modified configuration - see pylint.rc and flake8.cfg.

Unit

./coverage_test.sh

Note: This requires coverage.

Limitations

  • The No-Op type is not supported. (This should arguably be a protocol-level rather than serialisation-level option.)
  • Strongly-typed containers are only supported by the decoder (apart from for bytes/bytearray).
  • Encoder/decoder extensions are not supported at this time.
  • cython optimizations could be improved.

Why?

The only existing implementation I was aware of at the time of writing (simpleubjson) had the following limitations:

  • Does not support efficient binary encoding
  • Only supports draft-9
  • Only supports individual Python types rather than anything implementing an interface (e.g. Mapping)
  • Does not decode nested arrays or objects in expected form
  • Lacks C extension speed-up

Project details


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