Class: Eth::Contract::Function

Inherits:
Object
  • Object
show all
Defined in:
lib/eth/contract/function.rb

Overview

Provides the methods for smart contract function.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data) ⇒ Function

Constructor of the Function class.

Parameters:

  • data (Hash) —

    function input and output data.



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# File 'lib/eth/contract/function.rb', line 27

def initialize(data)
  @name = data["name"]
  @constant = data["constant"]
  @inputs = data["inputs"].map do |input|
    Eth::Contract::FunctionInput.new(input)
  end
  @outputs = data["outputs"].collect do |output|
    Eth::Contract::FunctionOutput.new(output)
  end
  @function_string = self.class.calc_signature(@name, @inputs)
  @signature = self.class.encoded_function_signature(@function_string)
end

Instance Attribute Details

#constant ⇒ Object

Returns the value of attribute constant.



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# File 'lib/eth/contract/function.rb', line 22

def constant
  @constant
end

#function_string ⇒ Object

Returns the value of attribute function_string.



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# File 'lib/eth/contract/function.rb', line 22

def function_string
  @function_string
end

#inputs ⇒ Object

Returns the value of attribute inputs.



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# File 'lib/eth/contract/function.rb', line 22

def inputs
  @inputs
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/eth/contract/function.rb', line 22

def name
  @name
end

#outputs ⇒ Object

Returns the value of attribute outputs.



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# File 'lib/eth/contract/function.rb', line 22

def outputs
  @outputs
end

#signature ⇒ Object

Returns the value of attribute signature.



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# File 'lib/eth/contract/function.rb', line 22

def signature
  @signature
end

Class Method Details

.calc_signature(name, inputs) ⇒ String

Creates function strings.

Parameters:

Returns:

  • (String) —

    function string.



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# File 'lib/eth/contract/function.rb', line 45

def self.calc_signature(name, inputs)
  "#{name}(#{inputs.map { |x| x.parsed_type.to_s }.join(",")})"
end

.encoded_function_signature(signature) ⇒ String

Encodes a function signature.

Parameters:

  • signature (String) —

    function signature.

Returns:

  • (String) —

    encoded function signature string.



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# File 'lib/eth/contract/function.rb', line 53

def self.encoded_function_signature(signature)
  Util.bin_to_hex Util.keccak256(signature)[0..3]
end