Skip to main content

Veriteos Ethereum ABI Utils

Project description

# Ethereum Contract

[![Build Status](https://circleci.com/gh/ethereum/eth-abi.svg?style=shield)](https://circleci.com/gh/ethereum/eth-abi) [![Documentation Status](https://readthedocs.org/projects/eth-abi/badge/?version=latest)](https://readthedocs.org/projects/eth-abi/?badge=latest) [![PyPi version](https://img.shields.io/pypi/v/eth-abi.svg)](https://pypi.python.org/pypi/eth-abi)

Python utilities for working with the Ethereum ABI

## Installation

`sh pip install eth-abi `

## Documentation

### Decoding

These functions are intended for decoding return values from the EVM.

  • eth_abi.decode_single(type, data)

This function tries to decode data into the python type that corresponds to the provided type. This function accepts data of type bytes.

>>> decode_single('uint256', b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0009')
12345

The value parameter is expected to be one of the recognized EVM types.

  • eth_abi.decode_abi(types, data)

This function decodes data into the python type corresponding to the provided types. This function accepts arrays of type byte.

>>> decode_abi(['uint256'], b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0009')
[12345]
>>> decode_abi(['bytes32', 'bytes32'], b'a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
['a', 'b']

The values parameter is expected to be an iterable whose values are all one of the recognized EVM types.

### Encoding

These functions are intended for encoding python values into representations that are suitable for interacting with the EVM.

  • eth_abi.encode_single(type, value)

This function encodes value in the ABI encoding for the provided type.

>>> encode_single('uint256', 12345)
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0009'

The value parameter is expected to be one of the recognized EVM types.

  • eth_abi.encode_abi(types, values)

This function encodes values in the ABI encoding for the corresponding type provided by the types argument.

>>> encode_abi(['uint256'], [12345])
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0009'
>>> encode_abi(['bytes32', 'bytes32'], ['a', 'b'])
b'a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'

The values parameter is expected to be an iterable whose values are all one of the recognized EVM types.

## Development

Clone the repository and then run:

`sh pip install -e . -r requirements-dev.txt `

### Running the tests

You can run the tests with:

`sh py.test tests `

Or you can install tox to run the full test suite.

### Releasing

Pandoc is required for transforming the markdown README to the proper format to render correctly on pypi.

For Debian-like systems:

` apt install pandoc `

Or on OSX:

`sh brew install pandoc `

To release a new version:

`sh make release bump=$$VERSION_PART_TO_BUMP$$ `

#### How to bumpversion

The version format for this repo is {major}.{minor}.{patch} for stable, and {major}.{minor}.{patch}-{stage}.{devnum} for unstable (stage can be alpha or beta).

To issue the next version in line, specify which part to bump, like make release bump=minor or make release bump=devnum.

If you are in a beta version, make release bump=stage will switch to a stable.

To issue an unstable version when the current version is stable, specify the new version explicitly, like make release bump=”–new-version 4.0.0-alpha.1 devnum”

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

veriteos-eth-abi-1.2.0.post0.tar.gz (44.3 kB view hashes)

Uploaded Source

Built Distribution

veriteos_eth_abi-1.2.0.post0-py2-none-any.whl (20.8 kB view hashes)

Uploaded Python 2

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page