Module: MastercoinWallet::Builder

Included in:
BitcoinOfferWindow, PurchaseOfferWindow, SellingOfferWindow, SimpleSendWindow
Defined in:
lib/mastercoin-wallet/builder.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#btc_amount ⇒ Object

Returns the value of attribute btc_amount.



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# File 'lib/mastercoin-wallet/builder.rb', line 3

def btc_amount
  @btc_amount
end

#fee ⇒ Object

Returns the value of attribute fee.



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# File 'lib/mastercoin-wallet/builder.rb', line 3

def fee
  @fee
end

#mastercoin_tx ⇒ Object

Returns the value of attribute mastercoin_tx.



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# File 'lib/mastercoin-wallet/builder.rb', line 3

def mastercoin_tx
  @mastercoin_tx
end

#tx_amount ⇒ Object

Returns the value of attribute tx_amount.



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# File 'lib/mastercoin-wallet/builder.rb', line 3

def tx_amount
  @tx_amount
end

Instance Method Details

#create_bitcoin_transaction_for(amount) ⇒ Object 



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# File 'lib/mastercoin-wallet/builder.rb', line 21

def create_bitcoin_transaction_for(amount)
  self.btc_amount = BigDecimal.new(amount)
  self.fee = BigDecimal.new("0.0001")
  self.tx_amount = BigDecimal.new("0.00006")

  # TODO REFACTOR AND DRY IT
  valid_output = MastercoinWallet.config.spendable_outputs.find{|x| BigDecimal.new(x[:value]) > (self.fee + self.tx_amount + self.btc_amount)}

  if valid_output.is_a?(Array)
    ouput = valid_output[0]
  else
    output = valid_output
  end

  unless output
      Qt::MessageBox.critical(self, tr("Could not send transaction"),
                             tr("It appears there are no spendable outputs for this address that are big enough to transmit this transaction. Please consolidate some coins and send them to your Mastercoin address."))
      return
  end

  change_amount = BigDecimal.new(output["value"]) - self.fee - self.btc_amount - self.tx_amount

  tx = MastercoinWallet.config.bitcoin_transactions.find{|x| x["hash"] == output["prev_out"]["hash"]}
  if tx.is_a?(Array)
    tx = tx[0]
  end

  # DRY THIS AS WELL SHOULD BE IS OWN METHOD
  begin
    priv_key = MastercoinWallet.config.get_encrypted_key(:private_key, @password)
  rescue ArgumentError
    Qt::MessageBox.information(self, tr("Could not send payment."),
                               tr("Could not send payment, wrong password."))
    return
  end
    begin
      key = Bitcoin::Key.from_base58(priv_key)
    rescue ArgumentError, RuntimeError
      begin
        key = Bitcoin::Key.new(priv_key)
      rescue ArgumentError, OpenSSL::BNError, RuntimeError
          Qt::MessageBox.information(self, tr("Could not send payment."),
                                     tr("Could not send payment, wrong password."))
        return
      end
    end

    tx = build_tx do |t|
      t.input do |i|
        i.prev_out Bitcoin::Protocol::Tx.from_hash(tx)
        i.prev_out_index output["prev_out"]["n"] 
        i.signature_key key
      end

      # Change address
      t.output do |o|
        o.value change_amount * 1e8

        o.script do |s|
          s.type :address
          s.recipient MastercoinWallet.config.address
        end
      end

      # Receiving address
      t.output do |o|
        o.value self.btc_amount * 1e8

        o.script do |s|
          s.type :address
          s.recipient @receiving_address
        end
      end

      # Exodus address
      t.output do |o|
        o.value self.tx_amount * 1e8

        o.script do |s|
          s.type :address
          s.recipient Mastercoin::EXODUS_ADDRESS
        end
      end
    end

    transmit!(tx)
end

#create_transaction_with_keys(data_keys, options = {}) ⇒ Object 



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# File 'lib/mastercoin-wallet/builder.rb', line 145

def create_transaction_with_keys(data_keys, options = {})
  public_keys = []
  public_keys << data_keys
  public_keys.flatten!

  if options.has_key?(:force_fee)
    self.set_fee(BigDecimal.new(options[:force_fee]))
  else
    self.set_fee
  end

  required_amount = (self.fee + self.mastercoin_tx)
  output, tx = pick_outputs(required_amount)

#      puts "Using output: #{output} and Tx: #{tx}"

  unless output
      Qt::MessageBox.critical(self, tr("Could not send transaction"),
                             tr("It appears there are no spendable outputs for this address that are big enough to transmit this transaction. Please consolidate some coins and send them to your Mastercoin address."))
      return
  end

  change_amount = BigDecimal.new(output["value"]) - fee - mastercoin_tx


  begin
    priv_key = MastercoinWallet.config.get_encrypted_key(:private_key, @password)
  rescue ArgumentError
    Qt::MessageBox.information(self, tr("Could not send payment."),
                               tr("Could not send payment, wrong password."))
    return
  end
    begin
      key = Bitcoin::Key.from_base58(priv_key)
    rescue ArgumentError, RuntimeError
      begin
        key = Bitcoin::Key.new(priv_key)
      rescue ArgumentError, OpenSSL::BNError, RuntimeError
          Qt::MessageBox.information(self, tr("Could not send payment."),
                                     tr("Could not send payment, wrong password."))
        return
      end
    end

    begin
      public_keys.insert(0, key.pub_compressed)
    rescue RuntimeError => e
          Qt::MessageBox.information(self, tr("Could not send payment."),
                                     tr("Something went wrong while trying to generate your public key. Please report this: #{e}"))
          return
    end


    tx = build_tx do |t|
      t.input do |i|
        i.prev_out Bitcoin::Protocol::Tx.from_hash(tx)
        i.prev_out_index output["prev_out"]["n"] 
        i.signature_key key
      end

      # Change address
      t.output do |o|
        o.value change_amount * 1e8

        o.script do |s|
          s.type :address
          s.recipient MastercoinWallet.config.address
        end
      end

      if @receiving_address
        # Receiving address
        t.output do |o|
          o.value tx_amount * 1e8

          o.script do |s|
            s.type :address
            s.recipient @receiving_address
          end
        end
      end

      # Exodus address
      t.output do |o|
        o.value tx_amount * 1e8

        o.script do |s|
          s.type :address
          s.recipient Mastercoin::EXODUS_ADDRESS
        end
      end

      # Data address
      t.output do |o|
        o.value (tx_amount) * 1e8 * 2

        o.script do |s|
          s.type :multisig
          s.recipient 1, *public_keys
        end
      end
    end
    transmit!(tx)
end

#pick_outputs(required_amount) ⇒ Object 



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# File 'lib/mastercoin-wallet/builder.rb', line 109

def pick_outputs(required_amount)
  used_outputs = MastercoinWallet.config.created_transactions.collect{|x| x["in"][0]["prev_out"] }
  usuable_outputs = MastercoinWallet.config.spendable_outputs.find{|x| BigDecimal.new(x[:value]) > BigDecimal.new(required_amount.to_s) }

  unless usuable_outputs
      Qt::MessageBox.critical(self, tr("Could not send transaction"),
                             tr("It appears there are no spendable outputs for this address that are big enough to transmit this transaction. Please consolidate some coins and send them to your Mastercoin address."))
      return
  end

  usuable_outputs = [usuable_outputs] if usuable_outputs.is_a?(Hash)
  usuable_outputs.reject!{|x| puts x; used_outputs.include?(x["prev_out"])}

  if usuable_outputs.empty?
    # Outputs are saved in order so the last output should always the one that's unused, make sure it's an output for thist address and that it's big enough
    if MastercoinWallet.config.created_transactions.last["out"].first["address"] == MastercoinWallet.config.address && MastercoinWallet.config.created_transactions.last["out"].first["value"].to_f >= BigDecimal.new(required_amount)
      # We are taking an full transaction and building a spendable output based on the details we have
      output = MastercoinWallet.config.created_transactions.last["out"].first.reverse_merge({prev_out: {hash: MastercoinWallet.config.created_transactions.last["hash"], n: 0}})
      tx = MastercoinWallet.config.created_transactions.last
      return output,tx
    else
      return nil, nil
    end
  else
    if usuable_outputs.is_a?(Array)
      usuable_outputs = usuable_outputs[0]
    end

    tx = MastercoinWallet.config.bitcoin_transactions.find{|x| x["hash"] == usuable_outputs["prev_out"]["hash"]}
    if tx.is_a?(Array)
      tx = tx[0]
    end
    return usuable_outputs, tx
  end
end

#set_fee(force_fee = nil) ⇒ Object 



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# File 'lib/mastercoin-wallet/builder.rb', line 5

def set_fee(force_fee = nil)
  self.fee = force_fee || BigDecimal.new("0.0001")

  if self.fee < 0.0001
    self.fee = BigDecimal.new("0.0001")
  end

  self.tx_amount = BigDecimal.new("0.00006")
  if @receiving_address
    output_counter = 4
  else
    output_counter = 3
  end
  self.mastercoin_tx = (output_counter * tx_amount)
end

#transmit!(tx) ⇒ Object 



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# File 'lib/mastercoin-wallet/builder.rb', line 250

def transmit!(tx)
    tx = Bitcoin::Protocol::Tx.new( tx.to_payload )

    MastercoinWallet.log.debug("TX Made: #{tx.to_hash}")

    transaction_hash = tx.to_payload.unpack("H*").first

    MastercoinWallet.log.debug("If you want to send it by Bitcoind use this")
    MastercoinWallet.log.debug(transaction_hash)
    MastercoinWallet.log.debug("Required fee: #{tx.calculate_minimum_fee} - Multisig size: #{tx.outputs.last.script.bytesize}")

    remote_transaction = Transaction.new(tx.to_hash["hash"], tx.to_json)
    response = remote_transaction.create!
    if response.parsed_response.keys.include?("error")
      Qt::MessageBox.critical(self, tr("Could not relay transaction"),
                             tr("The remote server could not transmit your transaction at this moment. #{response.parsed_response}"))
      return
    else
      sent_transactions = MastercoinWallet.config.get_key("created_transactions")
      sent_transactions ||= []
      sent_transactions << tx.to_hash(with_address: true)

      MastercoinWallet.config.set_key!(:created_transactions, sent_transactions)

      Qt::MessageBox.information(self, tr("Transaction send"),
                             tr("Your transaction with hash #{tx.to_hash["hash"]} has been offered to the relay server, it should show up within 10 minutes."))
    end
end