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ext_redeem.go
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/
ext_redeem.go
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/*
*/
package btc
import (
"bytes"
"encoding/json"
"fmt"
"github.com/tendermint/tendermint/libs/kv"
"github.com/btcsuite/btcd/wire"
"github.com/pkg/errors"
"github.com/Oneledger/protocol/action"
bitcoin2 "github.com/Oneledger/protocol/chains/bitcoin"
"github.com/Oneledger/protocol/data/bitcoin"
)
type Redeem struct {
Redeemer action.Address
TrackerName string
BTCTxn []byte
RedeemAmount int64
}
var _ action.Msg = &Redeem{}
func (bl Redeem) Signers() []action.Address {
return []action.Address{bl.Redeemer}
}
func (bl Redeem) Type() action.Type {
return action.BTC_REDEEM
}
func (bl Redeem) Tags() kv.Pairs {
tags := make([]kv.Pair, 0)
tag := kv.Pair{
Key: []byte("tx.type"),
Value: []byte(bl.Type().String()),
}
tag2 := kv.Pair{
Key: []byte("tx.redeem"),
Value: bl.Redeemer.Bytes(),
}
tag3 := kv.Pair{
Key: []byte("tx.redeemer"),
Value: bl.Redeemer,
}
tag4 := kv.Pair{
Key: []byte("tx.redeem_currency"),
Value: []byte("BTC"),
}
tags = append(tags, tag, tag2, tag3, tag4)
return tags
}
func (bl Redeem) Marshal() ([]byte, error) {
return json.Marshal(bl)
}
func (bl *Redeem) Unmarshal(data []byte) error {
return json.Unmarshal(data, bl)
}
type btcRedeemTx struct {
}
var _ action.Tx = btcRedeemTx{}
func (btcRedeemTx) Validate(ctx *action.Context, signedTx action.SignedTx) (bool, error) {
redeem := Redeem{}
err := redeem.Unmarshal(signedTx.Data)
if err != nil {
return false, errors.Wrap(action.ErrWrongTxType, err.Error())
}
err = action.ValidateBasic(signedTx.RawBytes(), redeem.Signers(), signedTx.Signatures)
if err != nil {
return false, err
}
err = action.ValidateFee(ctx.FeePool.GetOpt(), signedTx.Fee)
if err != nil {
return false, err
}
tracker, err := ctx.BTCTrackers.Get(redeem.TrackerName)
if err != nil {
return false, err
}
if !tracker.IsAvailable() {
return false, errors.New("tracker not available")
}
tx := wire.NewMsgTx(wire.TxVersion)
buf := bytes.NewBuffer(redeem.BTCTxn)
err = tx.Deserialize(buf)
if err != nil {
return false, errors.New("err in the deserialized btc txn")
}
if len(tx.TxIn) != 1 {
return false, errors.New("input should be 1 in txn")
}
op := tx.TxIn[0].PreviousOutPoint
// check if the source 0 in the txn is our tracker
if op.Hash != *tracker.CurrentTxId {
return false, errors.New("txn doesn't match tracker")
}
if op.Index != 0 {
return false, errors.New("txn doesn't match tracker")
}
opt := ctx.BTCTrackers.GetConfig()
if !bitcoin2.ValidateRedeem(tx, opt.BlockCypherToken, opt.BlockCypherChainType, tracker.CurrentTxId,
tracker.ProcessLockScriptAddress, tracker.CurrentBalance, redeem.RedeemAmount) {
return false, errors.New("txn doesn't match tracker")
}
return true, nil
}
func (btcRedeemTx) ProcessCheck(ctx *action.Context, tx action.RawTx) (bool, action.Response) {
return runExtRedeem(ctx, tx)
}
func (btcRedeemTx) ProcessDeliver(ctx *action.Context, tx action.RawTx) (bool, action.Response) {
return runExtRedeem(ctx, tx)
}
func (btcRedeemTx) ProcessFee(ctx *action.Context, signedTx action.SignedTx, start action.Gas, size action.Gas, gasUsed action.Gas) (bool, action.Response) {
ctx.State.ConsumeUpfront(701660)
return action.BasicFeeHandling(ctx, signedTx, start, size, 1)
}
func runExtRedeem(ctx *action.Context, tx action.RawTx) (bool, action.Response) {
redeem := Redeem{}
err := redeem.Unmarshal(tx.Data)
if err != nil {
return false, action.Response{Log: "wrong tx type"}
}
tracker, err := ctx.BTCTrackers.Get(redeem.TrackerName)
if err != nil {
return false, action.Response{Log: fmt.Sprintf("tracker not found: %s", redeem.TrackerName)}
}
if !tracker.IsAvailable() {
return false, action.Response{Log: fmt.Sprintf("tracker not available for redeem: ", redeem.TrackerName)}
}
btcTx := wire.NewMsgTx(wire.TxVersion)
buf := bytes.NewBuffer(redeem.BTCTxn)
err = btcTx.Deserialize(buf)
if err != nil {
return false, action.Response{Log: fmt.Sprintf("err bad btc txn: %s", redeem.TrackerName)}
}
if len(btcTx.TxIn) != 1 {
return false, action.Response{Log: fmt.Sprintf("err bad btc txn: %s", redeem.TrackerName)}
}
op := btcTx.TxIn[0].PreviousOutPoint
// check if the source 0 in the txn is our tracker
if op.Hash != *tracker.CurrentTxId {
return false, action.Response{Log: fmt.Sprintf("err bad btc txn: %s", redeem.TrackerName)}
}
if op.Index != 0 {
return false, action.Response{Log: fmt.Sprintf("err bad btc txn: %s", redeem.TrackerName)}
}
if !bytes.Equal(btcTx.TxOut[0].PkScript, tracker.ProcessLockScriptAddress) {
return false, action.Response{Log: fmt.Sprintf("err incorrect btc lock address ", redeem.TrackerName)}
}
tracker.ProcessType = bitcoin.ProcessTypeRedeem
tracker.ProcessOwner = redeem.Redeemer
tracker.Multisig.Msg = redeem.BTCTxn
tracker.ProcessBalance = tracker.CurrentBalance - redeem.RedeemAmount
tracker.ProcessUnsignedTx = redeem.BTCTxn // with user signature
tracker.State = bitcoin.Requested
dat := bitcoin.BTCTransitionContext{Tracker: tracker}
//_, err = bitcoin.Engine.Process("reserveTracker", dat, tracker.State)
//if err != nil {
// return false, action.Response{Log: "failed transition " + err.Error()}
//}
_ = dat
err = ctx.BTCTrackers.SetTracker(redeem.TrackerName, tracker)
if err != nil {
return false, action.Response{Log: "failed to update tracker err:" + err.Error()}
}
btcCurr, ok := ctx.Currencies.GetCurrencyByName("BTC")
if !ok {
return false, action.Response{Log: "failed to find currency BTC"}
}
coin := btcCurr.NewCoinFromUnit(redeem.RedeemAmount)
err = ctx.Balances.MinusFromAddress(redeem.Redeemer, coin)
if err != nil {
return false, action.Response{Log: "failed to subtract currency err:" + err.Error()}
}
tally := action.Address(ctx.BTCTrackers.GetOption().TotalSupplyAddr)
err = ctx.Balances.MinusFromAddress(tally, coin)
if err != nil {
return false, action.Response{Log: "failed to subtract currency err:" + err.Error()}
}
return true, action.Response{
Events: action.GetEvent(redeem.Tags(), "btc_redeem"),
}
}