Class: Ethlite::ContractMethod

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, inputs: [], outputs: [], constant: true) ⇒ ContractMethod

Returns a new instance of ContractMethod.



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# File 'lib/ethlite/contract.rb', line 12

def initialize( name, inputs:   [],
                      outputs:  [],
                      constant: true )
  @name         = name
  @constant     = constant

  ##  parse inputs & outputs into types
  @input_types  = inputs.map { |str| ABI::Type.parse( str ) }
  @output_types = outputs.map { |str| ABI::Type.parse( str ) }

  types = @input_types.map {|type| type.format }.join(',')
  @signature      = "#{@name}(#{types})"
  @signature_hash = Utils.encode_hex( Utils.keccak256( @signature)[0,4] )
end

Instance Attribute Details

#constant ⇒ Object (readonly)

Returns the value of attribute constant.



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# File 'lib/ethlite/contract.rb', line 5

def constant
  @constant
end

#input_types ⇒ Object (readonly)

Returns the value of attribute input_types.



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# File 'lib/ethlite/contract.rb', line 5

def input_types
  @input_types
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/ethlite/contract.rb', line 5

def name
  @name
end

#output_types ⇒ Object (readonly)

Returns the value of attribute output_types.



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# File 'lib/ethlite/contract.rb', line 5

def output_types
  @output_types
end

#signature ⇒ Object (readonly)

Returns the value of attribute signature.



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# File 'lib/ethlite/contract.rb', line 5

def signature
  @signature
end

#signature_hash ⇒ Object (readonly)

Returns the value of attribute signature_hash.



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# File 'lib/ethlite/contract.rb', line 5

def signature_hash
  @signature_hash
end

Instance Method Details

#debug? ⇒ Boolean

private helpers

Returns:

  • (Boolean) 


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# File 'lib/ethlite/contract.rb', line 60

def debug?()  Ethlite.debug?;  end

#do_call(rpc, contract_address, args) ⇒ Object 



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# File 'lib/ethlite/contract.rb', line 28

def do_call( rpc, contract_address, args )
  data = '0x' + @signature_hash + Utils.encode_hex(
                                   ABI.encode(@input_types, args) )

  method = 'eth_call'
  params = [{ to:   contract_address,
              data: data},
            'latest']
  response = rpc.request( method, params )

  if debug?
    puts "response:"
    pp response
  end

  bin = Utils.decode_hex( response )
  return nil    if bin.empty?

  result = ABI.decode( @output_types, bin )


  if debug?
    puts
    puts "result decode_abi:"
    pp result
  end

  result.length==1 ? result.first : result
end