Ethereum library for Ruby

A simple library for Ethereum.

Features

• Pure Ruby implementation
• IPC Client with batch calls support
• Compile and deploy Solidity contracts
• Expose deployed contracts as Ruby classes
• Test solidity contracts with a Ruby testing framework of your choice
• Call and wait for the result of Solidity function calls.

Ruby Compatibility

• Ruby 2.x
• Ruby 1.9.x
• JRuby
• Rubinius

Requirements

We currently support UNIX/Linux environments and Windows IPC support on the roadmap.

You will need to have a properly working Ruby installation. We recommend RVM

To use this library you will need to have a running Ethereum node with IPC support enabled (default). We currently support Go-Ethereum client

Installation

Add this line to your application's Gemfile:

gem 'ethereum'

And then execute:

$ bundle

Or install it yourself as:

$ gem install ethereum

Basic Usage

IPC Client Connection

client = Ethereum::IpcClient.new("#{ENV['HOME']}/.ethereum_testnet/geth.ipc")

Solidity contract compilation and deployment

init = Ethereum::Initializer.new("#{ENV['PWD']}/spec/fixtures/SimpleNameRegistry.sol", client)
init.build_all
simple_name_registry_instance = SimpleNameRegistry.new
simple_name_registry_instance.deploy_and_wait

Transacting and Calling Solidity Functions

Solidity functions are exposed using the following conventions:

transact_[function_name](params) 
transact_and_wait_[function_name](params)  
call_[function_name](params)

Example Contract in Solidity

contract SimpleNameRegistry {

  mapping (address => bool) public myMapping;

  function register(address _a, bytes32 _b) {
  }

  function getSomeValue(address _x) public constant returns(bool b, address b) {
  }

}

simple_name_registry_instance.transact_and_wait_register("0x5b6cb65d40b0e27fab87a2180abcab22174a2d45", "minter.contract.dgx")
simple_name_registry_instance.transact_register("0x385acafdb80b71ae001f1dbd0d65e62ec2fff055", "anthony@eufemio.dgx")
simple_name_registry_instance.call_get_some_value("0x385acafdb80b71ae001f1dbd0d65e62ec2fff055")
simple_name_registry_instance.call_my_mapping("0x385acafdb80b71ae001f1dbd0d65e62ec2fff055")

Run contracts using a different address

simple_name_registry_instance.as("0x0c0d99d3608a2d1d38bb1b28025e970d3910b1e1")

Point contract instance to a previously deployed contract

simple_name_registry_instance.at("0x734533083b5fc0cd14b7cb8c8eb6ed0c9bd184d3")

Roadmap

• Add JSON RPC Client support
• Add support for creating and sending of raw transactions
• Offline account creation
• Add Windows IPC Client (named pipes)
• Solidity constant function output should be properly formatted according to the ouput data type
• Unit testing and contract testing examples
• Add more examples
• API documentation

Support

Please join our Gitter chat room or open a new issue in this repository

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/DigixGlobal/ethereum-ruby. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.