AbiCoderRb

modified from https://github.com/rubycocos/blockchain/blob/master/abicoder

for better readability code and deep learning abi codec.

Changes compared to original code:

0. Adjusted files structure
1. The biggest change for readability is that the 'data' to decode in every decode_* function is no longer exact but now includes both the data needed for decoding and the remaining data. This change means that in the entry point('AbiCoderRb.decode'), there's no longer a need to calculate the precise data required for decoding for each type. This simplification streamlines the code.
2. Fixed some encoding end decoding bugs.
3. Use string to describe any abi type. This is for compatibility with other abi libs.
4. Added pre- encoding and post- decoding callbacks to facilitate transforming data before encoding and after decoding. See 1 2
5. pass all web3.js tests in encodeDecodeParams.test.ts. That is about 1024 unit tests from fixture abitestsdata.json.
6. support packed encoding similar to abi.encodePacked. See test

Also, some code was modified to compile to wasm. Try it online: https://wuminzhe.github.io/abi.html

Install the gem and add to the application's Gemfile by executing:

$ bundle add abi_coder_rb

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install abi_coder_rb

require 'abi_coder_rb'

module ABI
  extend AbiCoderRb
end

type = "(bytes4)"
value = ["\x124Vx"] # or ABI.hex "0x12345678"
data = ABI.hex "1234567800000000000000000000000000000000000000000000000000000000"
ABI.decode(type, data) == value # => true
ABI.encode(type, value) == data # => true

You can transform the value according to the type before encoding it. For example, you can convert the hex string to bytes before encoding it. Here is same example but the value for "bytes4" is a hex string.

require 'abi_coder_rb'

module ABI
  extend AbiCoderRb

  before_encoding ->(type, value) { 
    if type.start_with?("bytes")
      hex(value)
    else
      value
    end
  }
end

type = "(bytes4)"
value = ["0x12345678"]
data = ABI.hex "1234567800000000000000000000000000000000000000000000000000000000"
ABI.encode(type, value) == data # => true

class Hello
  include AbiCoderRb

  def world
    data = hex "0000000000000000000000000000000000000000000000000000000000000020" \
               "000000000000000000000000000000000000000000000000000000000000000b" \
               "48656c6c6f20576f726c64000000000000000000000000000000000000000000"
    decode("(string)", data)
  end
end

Hello.new.world # => ["Hello World"]

# encodePacked
type = "int64"
value = 17

encode(type, value, true) # => "0x0000000000000011"

It is similar to abi.encode(v1, v2, ..) or abi.encodePacked(v1, v2, ..) in solidity.

types = ["int32", "uint64"]
values = [17, 17]

# abi.encode(v1, v2)
encode(types, values) # => "0x00000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000011"

# abi.encodePacked(v1, v2)
encode(types, values, true) # => "0x000000110000000000000011"

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 the created tag, and push the .gem file to rubygems.org.

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

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

Everyone interacting in the AbiCoderRb project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.