class EthereumContractABI::ContractInterface::Function

Attributes

inputs[R]
name[R]
outputs[R]

Public Class Methods

new(name, inputs, outputs) click to toggle source
# File lib/ethereum-contract-abi/contract/function.rb, line 15
def initialize(name, inputs, outputs)
  @name = name
  @inputs = inputs
  @outputs = outputs
  @decoder = FunctionDecoder.new(outputs)
  @encoder = FunctionEncoder.new(inputs)
end

Public Instance Methods

decode_output(output_string) click to toggle source
# File lib/ethereum-contract-abi/contract/function.rb, line 48
def decode_output(output_string)
  output_hex_string = EthereumContractABI::Util.remove_hex_prefix(output_string)
  if has_any_dynamic_outputs
    @decoder.decode_dynamic_output(output_hex_string)
  else
    @decoder.decode_static_output(output_hex_string)
  end
end
encode_call(*args) click to toggle source
# File lib/ethereum-contract-abi/contract/function.rb, line 38
def encode_call(*args)
  raise ArgumentError.new("Invalid function arguments") unless valid_args?(args)
  if has_any_dynamic_inputs
    encoded_input = @encoder.encode_dynamic_input(args)
  else
    encoded_input = @encoder.encode_static_input(args)
  end
  EthereumContractABI::Util.fromHexByteString(method_id + encoded_input)
end
method_id() click to toggle source
# File lib/ethereum-contract-abi/contract/function.rb, line 28
def method_id
  hash = [Digest::Keccak256.new.hexdigest(signature)].pack("H*")
  hash.slice(0..3)
end
signature() click to toggle source
# File lib/ethereum-contract-abi/contract/function.rb, line 23
def signature
  params = @inputs.map { |i| i.type.to_s }
  "#{@name}(#{params.join(",")})"
end
valid_args?(args) click to toggle source
# File lib/ethereum-contract-abi/contract/function.rb, line 33
def valid_args?(args)
  return false unless args.size === @inputs.size
  true
end

Private Instance Methods

has_any_dynamic_inputs() click to toggle source
# File lib/ethereum-contract-abi/contract/function.rb, line 63
def has_any_dynamic_inputs
  @inputs.find { |o| o.type.is_dynamic }
end
has_any_dynamic_outputs() click to toggle source
# File lib/ethereum-contract-abi/contract/function.rb, line 59
def has_any_dynamic_outputs
  @outputs.find { |o| o.type.is_dynamic }
end