Ejemplo n.º 1
0
func Txs(args []string) error {
	alltx, err := SCon.TS.GetAllTxs()
	if err != nil {
		return err
	}
	for i, tx := range alltx {
		fmt.Printf("tx %d %s\n", i, uspv.TxToString(tx))
	}
	return nil
}
Ejemplo n.º 2
0
// SendCoins does send coins, but it's very rudimentary
func SendCoins(s uspv.SPVCon, adr btcutil.Address, sendAmt int64) error {
	var err error
	var score int64
	allUtxos, err := s.TS.GetAllUtxos()
	if err != nil {
		return err
	}

	for _, utxo := range allUtxos {
		score += utxo.Value
	}
	// important rule in bitcoin, output total > input total is invalid.
	if sendAmt > score {
		return fmt.Errorf("trying to send %d but %d available.",
			sendAmt, score)
	}

	tx := wire.NewMsgTx() // make new tx
	// make address script 76a914...88ac
	adrScript, err := txscript.PayToAddrScript(adr)
	if err != nil {
		return err
	}
	// make user specified txout and add to tx
	txout := wire.NewTxOut(sendAmt, adrScript)
	tx.AddTxOut(txout)

	nokori := sendAmt // nokori is how much is needed on input side
	for _, utxo := range allUtxos {
		// generate pkscript to sign
		prevPKscript, err := txscript.PayToAddrScript(
			s.TS.Adrs[utxo.KeyIdx].PkhAdr)
		if err != nil {
			return err
		}
		// make new input from this utxo
		thisInput := wire.NewTxIn(&utxo.Op, prevPKscript)
		tx.AddTxIn(thisInput)
		nokori -= utxo.Value
		if nokori < -10000 { // minimum overage / fee is 1K now
			break
		}
	}
	// there's enough left to make a change output
	if nokori < -200000 {
		change, err := s.TS.NewAdr()
		if err != nil {
			return err
		}

		changeScript, err := txscript.PayToAddrScript(change)
		if err != nil {
			return err
		}
		changeOut := wire.NewTxOut((-100000)-nokori, changeScript)
		tx.AddTxOut(changeOut)
	}

	// use txstore method to sign
	err = s.TS.SignThis(tx)
	if err != nil {
		return err
	}

	fmt.Printf("tx: %s", uspv.TxToString(tx))
	buf := bytes.NewBuffer(make([]byte, 0, tx.SerializeSize()))
	tx.Serialize(buf)
	fmt.Printf("tx: %x\n", buf.Bytes())

	// send it out on the wire.  hope it gets there.
	// we should deal with rejects.  Don't yet.
	err = s.NewOutgoingTx(tx)
	if err != nil {
		return err
	}
	return nil
}