Class: Bitcoin::Protocol::Tx

Inherits:
Object
  • Object
show all
Includes:
Util
Defined in:
lib/segwit/tx.rb

Overview

extension for Bitcoin::Protocol::Tx to support segwit

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data = nil) ⇒ Tx

Returns a new instance of Tx.



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# File 'lib/segwit/tx.rb', line 7

def initialize(data=nil)
  @ver, @lock_time, @in, @out, @scripts, @witness = 1, 0, [], [], [], Bitcoin::Protocol::TxWitness.new
  @enable_bitcoinconsensus = !!ENV['USE_BITCOINCONSENSUS']
  if data
    begin
      parse_witness_data_from_io(data) unless parse_data_from_io(data).is_a?(TrueClass)
    rescue Exception
      parse_witness_data_from_io(data)
    end
  end
end

Instance Attribute Details

#witness ⇒ Object (readonly)

Returns the value of attribute witness.



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# File 'lib/segwit/tx.rb', line 5

def witness
  @witness
end

Instance Method Details

#parse_witness_data_from_io(data) ⇒ Object

parse raw data which include witness data serialization format is defined by github.com/bitcoin/bips/blob/master/bip-0144.mediawiki



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# File 'lib/segwit/tx.rb', line 26

def parse_witness_data_from_io(data)
  buf = data.is_a?(String) ? StringIO.new(data) : data

  @ver = buf.read(4).unpack("V").first

  @marker = buf.read(1).unpack("c").first

  @flag = buf.read(1).unpack("c").first

  in_size = Bitcoin::Protocol.unpack_var_int_from_io(buf)
  @in = []
  in_size.times{
    break if buf.eof?
    @in << Bitcoin::Protocol::TxIn.from_io(buf)
  }

  out_size = Bitcoin::Protocol.unpack_var_int_from_io(buf)
  @out = []
  out_size.times{
    break if buf.eof?
    @out << Bitcoin::Protocol::TxOut.from_io(buf)
  }

  @witness = Bitcoin::Protocol::TxWitness.new
  in_size.times{
    witness_count = Bitcoin::Protocol.unpack_var_int_from_io(buf)
    in_witness = Bitcoin::Protocol::TxInWitness.new
    witness_count.times{
      length = Bitcoin::Protocol.unpack_var_int_from_io(buf)
      in_witness.add_stack(buf.read(length).unpack("H*").first)
    }
    @witness.add_witness(in_witness)
  }

  @lock_time = buf.read(4).unpack("V").first

  @hash = hash_from_payload(to_payload)
end

#to_witness_payload ⇒ Object

output transaction in raw binary format with witness



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# File 'lib/segwit/tx.rb', line 66

def to_witness_payload
  pin = ""
  @in.each{|input| pin << input.to_payload }
  pout = ""
  @out.each{|output| pout << output.to_payload }
  payload = [@ver].pack("V") << [0].pack("c") << [1].pack("c") << Bitcoin::Protocol.pack_var_int(@in.size) << pin <<
      Bitcoin::Protocol.pack_var_int(@out.size) << pout << @witness.to_payload << [@lock_time].pack("V")
  payload
end

#witness_hash ⇒ Object

get witness hash



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# File 'lib/segwit/tx.rb', line 20

def witness_hash
  hash_from_payload(to_witness_payload)
end