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btc_transfer.go
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btc_transfer.go
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package trade
import (
"encoding/hex"
"errors"
"fmt"
"github.com/MysGate/go-fundamental/chain/btc/btcapi"
"github.com/MysGate/go-fundamental/chain/btc/txpool"
"github.com/MysGate/go-fundamental/util"
"github.com/btcsuite/btcd/btcutil"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/mempool"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
)
type tx_type int
const (
tx_a_b tx_type = iota
tx_as_b
tx_as_bs
)
const (
dirty_bitcoin int64 = 546
)
type Target struct {
Addr btcutil.Address
Amount int64
}
func BtcWif2Address(wif string, netParams *chaincfg.Params) (address btcutil.Address) {
privKeyWif, err := btcutil.DecodeWIF(wif)
if err != nil {
errMsg := fmt.Sprintf("BtcWif2Address err:%+v", err)
util.Logger().Error(errMsg)
return
}
pubKeySerial := privKeyWif.PrivKey.PubKey().SerializeUncompressed()
pubKey, err := btcutil.NewAddressPubKey(pubKeySerial, netParams)
if err != nil {
errMsg := fmt.Sprintf("BtcWif2Address err:%+v", err)
util.Logger().Error(errMsg)
return
}
addr := pubKey.EncodeAddress()
address, err = btcutil.DecodeAddress(addr, netParams)
if err != nil {
errMsg := fmt.Sprintf("BtcWif2Address err:%+v", err)
util.Logger().Error(errMsg)
return
}
return
}
func GetTxFee(tx *wire.MsgTx, l feelevel) int64 {
feeRate := GetBtcFee().GetFeeRate(l)
fee := btcutil.Amount(mempool.GetTxVirtualSize(btcutil.NewTx(tx))) * btcutil.Amount(feeRate)
return int64(fee)
}
func SignTx(privKey string, pkScripts []string, redeemTx *wire.MsgTx) (*wire.MsgTx, error) {
wif, err := btcutil.DecodeWIF(privKey)
if err != nil {
errMsg := fmt.Sprintf("SignTx err:%+v", err)
util.Logger().Error(errMsg)
return nil, err
}
for idx, pkScript := range pkScripts {
sourcePKScript, err := hex.DecodeString(pkScript)
if err != nil {
errMsg := fmt.Sprintf("SignTx err:%+v", err)
util.Logger().Error(errMsg)
return nil, err
}
signature, err := txscript.SignatureScript(redeemTx, idx, sourcePKScript, txscript.SigHashAll, wif.PrivKey, false)
if err != nil {
errMsg := fmt.Sprintf("SignTx err:%+v", err)
util.Logger().Error(errMsg)
return nil, err
}
redeemTx.TxIn[idx].SignatureScript = signature
}
return redeemTx, nil
}
func GetBalance(outputs []*btcapi.UnspentOutput) (amount int64) {
for _, o := range outputs {
amount += o.Output.Value
}
return
}
func selectA2BOutput(outputs []*btcapi.UnspentOutput, amount int64, last_out *btcapi.UnspentOutput) (output *btcapi.UnspentOutput) {
var last_idx int = -1
if last_out != nil {
last_idx = int(last_out.Outpoint.Index)
}
for _, out := range outputs {
if out.Output.Value > amount && int(out.Outpoint.Index) > last_idx {
return out
}
}
return nil
}
func selectAS2BSOutputs(outputs []*btcapi.UnspentOutput, amount int64) (outs [][]*btcapi.UnspentOutput) {
combinations := util.All(outputs)
for _, combination := range combinations {
var total int64
for _, sub := range combination {
total += sub.Output.Value
}
if total > amount {
outs = append(outs, combination)
}
}
return
}
func buildTxin(redeemTx *wire.MsgTx, out *btcapi.UnspentOutput) (pkScript string) {
outPoint := wire.NewOutPoint(&out.Outpoint.Hash, out.Outpoint.Index)
txIn := wire.NewTxIn(outPoint, nil, nil)
redeemTx.AddTxIn(txIn)
pkScript = hex.EncodeToString(out.Output.PkScript)
return
}
func buildTxout(redeemTx *wire.MsgTx, target *Target, addTx bool) (*wire.TxOut, error) {
outScript, err := txscript.PayToAddrScript(target.Addr)
if err != nil {
errMsg := fmt.Sprintf("buildMsgTx err:%+v", err)
err = errors.New(errMsg)
util.Logger().Error(errMsg)
return nil, err
}
redeemTxOut := wire.NewTxOut(target.Amount, outScript)
if addTx {
redeemTx.AddTxOut(redeemTxOut)
}
return redeemTxOut, nil
}
func buildMsgTx(t tx_type, receivers []*Target, changeReceiver btcutil.Address, outputs []*btcapi.UnspentOutput) (redeemTx *wire.MsgTx, PKScripts []string, err error) {
redeemTx = wire.NewMsgTx(wire.TxVersion)
switch t {
case tx_a_b:
var out *btcapi.UnspentOutput
for {
out = selectA2BOutput(outputs, receivers[0].Amount, nil)
if out == nil {
err = errors.New("buildMsgTx: txin no valid utxo")
return
}
pkScript := buildTxin(redeemTx, out)
PKScripts = append(PKScripts, pkScript)
_, err = buildTxout(redeemTx, receivers[0], true)
if err != nil {
errMsg := fmt.Sprintf("buildMsgTx err:%+v", err)
err = errors.New(errMsg)
util.Logger().Error(errMsg)
return
}
// change
var redeemTxOutChange *wire.TxOut
redeemTxOutChange, err = buildTxout(redeemTx, &Target{Addr: changeReceiver}, true)
if err != nil {
errMsg := fmt.Sprintf("buildMsgTx err:%+v", err)
err = errors.New(errMsg)
util.Logger().Error(errMsg)
return
}
// adjuest fee
fee := GetTxFee(redeemTx, feelevel_mid)
if out.Output.Value-fee-receivers[0].Amount < dirty_bitcoin {
redeemTx.TxIn = nil
redeemTx.TxOut = nil
continue
} else {
redeemTxOutChange.Value = out.Output.Value - fee - receivers[0].Amount
}
}
case tx_as_b:
// txin
for _, output := range outputs {
pkScript := buildTxin(redeemTx, output)
PKScripts = append(PKScripts, pkScript)
}
// txout
total := GetBalance(outputs)
receivers[0].Amount = total
var redeemTxOut *wire.TxOut
redeemTxOut, err = buildTxout(redeemTx, receivers[0], true)
if err != nil {
errMsg := fmt.Sprintf("buildMsgTx err:%+v", err)
err = errors.New(errMsg)
util.Logger().Error(errMsg)
return
}
// adjuest fee
fee := GetTxFee(redeemTx, feelevel_mid)
redeemTxOut.Value = total - fee
case tx_as_bs:
var total int64
for _, receiver := range receivers {
total += receiver.Amount
_, err = buildTxout(redeemTx, receiver, true)
if err != nil {
errMsg := fmt.Sprintf("buildMsgTx err:%+v", err)
err = errors.New(errMsg)
util.Logger().Error(errMsg)
return
}
}
var changeTxout *wire.TxOut
changeTxout, err = buildTxout(redeemTx, &Target{Addr: changeReceiver}, false)
if err != nil {
errMsg := fmt.Sprintf("buildMsgTx err:%+v", err)
err = errors.New(errMsg)
util.Logger().Error(errMsg)
return
}
outs := selectAS2BSOutputs(outputs, total)
for _, out := range outs {
balance := GetBalance(out)
for _, o := range out {
pkScript := buildTxin(redeemTx, o)
PKScripts = append(PKScripts, pkScript)
}
// adjuest fee
fee := GetTxFee(redeemTx, feelevel_mid)
change := balance - total - fee
if change > dirty_bitcoin {
redeemTx.TxOut = append(redeemTx.TxOut, changeTxout)
newFee := GetTxFee(redeemTx, feelevel_mid)
newChange := balance - total - newFee
if change >= dirty_bitcoin {
changeTxout.Value = newChange
} else {
newOuts := util.RemoveIndex(redeemTx.TxOut, len(redeemTx.TxOut)-1)
redeemTx.TxOut = newOuts
}
break
} else if change < 0 {
redeemTx.TxIn = nil
PKScripts = nil
continue
} else if change >= 0 && change <= dirty_bitcoin {
break
}
}
default:
err = errors.New("buildMsgTx: invalid tx type")
return
}
return
}
func GetClientUnspent(wif string, netParams *chaincfg.Params) (client *txpool.TxpoolClient, outputs []*btcapi.UnspentOutput, from btcutil.Address, err error) {
client = txpool.NewClient(netParams)
from = BtcWif2Address(wif, netParams)
outputs, err = client.ListUnspent(from)
return
}
func MakeSignedTxAndBroastcast(t tx_type, client *txpool.TxpoolClient, receivers []*Target, wif string, from btcutil.Address, outputs []*btcapi.UnspentOutput) (txid string, err error) {
redeemTx, PKScripts, err := buildMsgTx(t, receivers, from, outputs)
if err != nil {
errMsg := fmt.Sprintf("MakeSignedTxAndBroastcast err:%+v", err)
util.Logger().Error(errMsg)
err = errors.New(errMsg)
return
}
signedTx, err := SignTx(wif, PKScripts, redeemTx)
if err != nil {
errMsg := fmt.Sprintf("MakeSignedTxAndBroastcast err:%+v", err)
util.Logger().Error(errMsg)
err = errors.New(errMsg)
return
}
commitTxHash, err := client.BroadcastTx(signedTx)
if err != nil {
errMsg := fmt.Sprintf("MakeSignedTxAndBroastcast err:%+v", err)
util.Logger().Error(errMsg)
return
}
txid = commitTxHash.String()
return
}
// common transaction
// 1: common transfer
func A2BTrade(wif string, receiver *Target, netParams *chaincfg.Params) (txid string, err error) {
client, outputs, from, err := GetClientUnspent(wif, netParams)
if err != nil {
errMsg := fmt.Sprintf("A2BTrade err:%+v", err)
util.Logger().Error(errMsg)
return
}
var receivers []*Target
receivers = append(receivers, receiver)
txid, err = MakeSignedTxAndBroastcast(tx_a_b, client, receivers, wif, from, outputs)
if err != nil {
errMsg := fmt.Sprintf("AS2BTrade err:%+v", err)
util.Logger().Error(errMsg)
return
}
return
}
// 2: found collect
func AS2BTrade(wif string, receiver btcutil.Address, netParams *chaincfg.Params) (txid string, err error) {
client, outputs, _, err := GetClientUnspent(wif, netParams)
if err != nil {
errMsg := fmt.Sprintf("AS2BTrade err:%+v", err)
util.Logger().Error(errMsg)
return
}
var receivers []*Target
receivers = append(receivers, &Target{Addr: receiver})
txid, err = MakeSignedTxAndBroastcast(tx_as_b, client, receivers, wif, nil, outputs)
if err != nil {
errMsg := fmt.Sprintf("AS2BTrade err:%+v", err)
util.Logger().Error(errMsg)
return
}
return
}
// 3: pay for salary
func AS2BSTrade(wif string, receivers []*Target, netParams *chaincfg.Params) (txid string, err error) {
client, outputs, from, err := GetClientUnspent(wif, netParams)
if err != nil {
errMsg := fmt.Sprintf("AS2BSTrade err:%+v", err)
util.Logger().Error(errMsg)
return
}
var total int64 = 0
for _, r := range receivers {
total += r.Amount
}
balance := GetBalance(outputs)
if balance < total {
errMsg := "AS2BSTrade insufficient balance."
util.Logger().Error(errMsg)
return
}
txid, err = MakeSignedTxAndBroastcast(tx_as_bs, client, receivers, wif, from, outputs)
if err != nil {
errMsg := fmt.Sprintf("AS2BSTrade err:%+v", err)
util.Logger().Error(errMsg)
return
}
return
}