Module: BitcoinOpReturn

Defined in:
lib/bitcoin_op_return.rb

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.bitcoind_cmd ⇒ Object

Returns the value of attribute bitcoind_cmd.



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# File 'lib/bitcoin_op_return.rb', line 12

def bitcoind_cmd
  @bitcoind_cmd
end

.transaction_fee ⇒ Object

Returns the value of attribute transaction_fee.



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# File 'lib/bitcoin_op_return.rb', line 12

def transaction_fee
  @transaction_fee
end

Class Method Details

.create(options) ⇒ Object 



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# File 'lib/bitcoin_op_return.rb', line 14

def create options
  send_address = options[:address].to_s
  send_amount = options[:amount].to_f
  metadata = options[:metadata].to_s
  testnet = !options[:testnet].nil?
  transaction_fee = options[:transaction_fee].to_f || self.transaction_fee

  # convert to hex where possible
  metadata = [ metadata ].pack("H*") if metadata =~ /\A([0-9A-Fa-f]{2})*\z/

  return { :error => "invalid address" } unless bitcoind("validateaddress", testnet, send_address)["isvalid"]
  return { :error => "metadata too long, limit is 75, recommended is 40 bytes" } if metadata.length > 75

  # get the unspent inputs
  unspent_inputs = bitcoind("listunspent", testnet, 0)
  return { :error => "unable to retrieve unspent inputs" } unless unspent_inputs.kind_of? Array

  unspent_inputs.each do |input|
    input["priority"] = input["amount"] * input["confirmations"]
  end

  unspent_inputs.sort! do |a, b|
    a = a["priority"]
    b = b["priority"]
    # a follows b => -1
    # a == b => 0
    # b follows a => 1
    a == b ? 0 : (a < b ? 1 : -1)
  end

  inputs_spend = []
  output_amount = send_amount + self.transaction_fee
  inputs_amount = 0

  unspent_inputs.each do |input|
    inputs_spend << input
    inputs_amount += input["amount"]
    break if inputs_amount >= output_amount
  end

  return { :error => "insufficient funds to carry out transaction" } if inputs_amount < output_amount


  outputs_hash = {}
  outputs_hash[send_address] = send_amount


  unless inputs_amount == output_amount # no change
    change = inputs_amount - output_amount
    outputs_hash[bitcoind("getrawchangeaddress", testnet)] = change
  end

  # pack then unpack
  raw_txn = bitcoind("createrawtransaction", testnet, inputs_spend, outputs_hash)

  unpacked_txn = unpack_raw_txn(raw_txn)

  # append opreturn (6a represents op_return)
  
  op_return_script = "6a" + "#{metadata.length.chr}#{metadata}".unpack("H*")[0]

  unpacked_txn["vout"].push({
    "value" => 0,
    "scriptPubKey" => op_return_script
  })

  # $raw_txn=coinspark_pack_raw_txn($txn_unpacked);
  raw_txn = pack_raw_txn(unpacked_txn)
    
  sign_txn_response = bitcoind("signrawtransaction", testnet, raw_txn)
  # txid = bitcoind("sendrawtransaction", testnet, signed_txn)

  return { :error => "error signing transaction" } unless sign_txn_response["complete"]

  txid = bitcoind("sendrawtransaction", testnet, sign_txn_response["hex"])

  if txid.length != 64
    { :error => "could not send transaction" }
  else
    { :txid => txid }
  end
end