Class: Klaytn::Encoder

Inherits:
Object
  • Object
show all
Defined in:
lib/klaytn/encoder.rb

Instance Method Summary collapse

Instance Method Details

#do_encode_fixed(value, n) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 87

def do_encode_fixed(value, n)
  encode_uint((value * 2**n).to_i)
end

#encode(type, value) ⇒ Object

code below this point was adopted from ethereum.rb gem in order to avoid dependency issues with Digest requiring older Ruby versions



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# File 'lib/klaytn/encoder.rb', line 19

def encode(type, value)
  is_array, arity, array_subtype = parse_array_type(type)
  if is_array && arity
    encode_static_array(arity, array_subtype, value)
  elsif is_array
    encode_dynamic_array(array_subtype, value)
  else
    core, subtype = parse_type(type)
    method_name = "encode_#{core}".to_sym
    self.send(method_name, value, subtype)
  end
end

#encode_address(value, _) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/klaytn/encoder.rb', line 117

def encode_address(value, _)
  value = "0" * 24 + value.gsub(/^0x/,'')
  raise ArgumentError if value.size != 64
  value
end

#encode_arguments(inputs, args) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 61

def encode_arguments(inputs, args)
  raise "Wrong number of arguments" if inputs.length != args.length
  @head = ""
  @tail = ""
  @inputs = inputs
  inputs.each.with_index do |input, index|
    encoded = encode(input.type, args[index])
    if encoded.is_a? Array
      @head << encoded[0]
      @tail << encoded[1]
    else
      @head << encoded
    end
  end
  @head + @tail
end

#encode_bool(value, _) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 78

def encode_bool(value, _)
  (value ? "1" : "0").rjust(64, '0')
end

#encode_bytes(value, subtype) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 95

def encode_bytes(value, subtype)
  subtype.nil? ? encode_dynamic_bytes(value) : encode_static_bytes(value)
end

#encode_dynamic_array(array_subtype, array) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 37

def encode_dynamic_array(array_subtype, array)
  location = encode_uint(@inputs ? size_of_inputs(@inputs) + @tail.size/2 : 32)
  size = encode_uint(array.size)
  data = array.inject("") { |a, e| a << encode(array_subtype, e) }
  [location, size + data]
end

#encode_dynamic_bytes(value) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 103

def encode_dynamic_bytes(value)
  location = encode_uint(@inputs ? size_of_inputs(@inputs) + @tail.size/2 : 32)
  size = encode_uint(value.size)
  content = encode_static_bytes(value)
  [location, size + content]
end

#encode_fixed(value, subtype) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 82

def encode_fixed(value, subtype)
  n = subtype.nil? ? 128 : /(\d+)x(\d+)/.match(subtype)[2].to_i
  do_encode_fixed(value, n)
end

#encode_function(definition, inputs, params) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 3

def encode_function(definition, inputs, params)
  prefix = '0x'
  str = Digest::Keccak.hexdigest(definition, 256)[0..7] # ex: "getEarnout(uint256)"
  num = encode_arguments(inputs, params)

  "#{prefix}#{str}#{num}"
end

#encode_int(value, _ = nil) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 128

def encode_int(value, _ = nil)
  to_twos_complement(value).to_s(16).rjust(64, '0')
end

#encode_integer(integer) ⇒ Object

ex: 5000000000000000000 (5 KLAY) => 0x4563918244f40000



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# File 'lib/klaytn/encoder.rb', line 11

def encode_integer(integer) # ex: 5000000000000000000 (5 KLAY) => 0x4563918244f40000
  return '0x0' if integer.zero?
  long = encode_uint(integer)
  '0x' + long.sub!(/^[0]+/,'')
end

#encode_static_array(arity, array_subtype, array) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 32

def encode_static_array(arity, array_subtype, array)
  raise "Wrong number of arguments" if arity != array.size
  array.inject("") { |a, e| a << encode(array_subtype, e) }
end

#encode_static_bytes(value) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 99

def encode_static_bytes(value)
  value.bytes.map {|x| x.to_s(16).rjust(2, '0')}.join("").ljust(64, '0')
end

#encode_string(value, _) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 110

def encode_string(value, _)
  location = encode_uint(@inputs ? size_of_inputs(@inputs) + @tail.size/2 : 32)
  size = encode_uint(value.bytes.size)
  content = value.bytes.map {|x| x.to_s(16).rjust(2, '0')}.join("").ljust(64, '0')
  [location, size + content]
end

#encode_ufixed(_value, _) ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/klaytn/encoder.rb', line 91

def encode_ufixed(_value, _)
  raise NotImplementedError
end

#encode_uint(value, _ = nil) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/klaytn/encoder.rb', line 123

def encode_uint(value, _ = nil)
  raise ArgumentError if value < 0
  encode_int(value)
end

#parse_array_type(type) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 44

def parse_array_type(type)
  match = /(.+)\[(\d*)\]\z/.match(type)
  if match
    [true, match[2].present? ? match[2].to_i : nil, match[1]]
  else
    [false, nil, nil]
  end
end

#parse_type(type) ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/klaytn/encoder.rb', line 53

def parse_type(type)
  puts "TYPE: #{type}"
  # raise NotImplementedError if type.ends_with?("]")
  raise NotImplementedError if type[-1] == "]"
  match = /(\D+)(\d.*)?/.match(type)
  [match[1], match[2]]
end

#to_twos_complement(number) ⇒ Object 



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# File 'lib/klaytn/encoder.rb', line 132

def to_twos_complement(number)
  (number & ((1 << 256) - 1))
end