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package statedb
import (
"errors"
"io/ioutil"
"math/big"
"os"
"github.com/hermeznetwork/hermez-node/common"
"github.com/hermeznetwork/hermez-node/log"
"github.com/iden3/go-iden3-crypto/babyjub"
"github.com/iden3/go-merkletree"
"github.com/iden3/go-merkletree/db"
"github.com/iden3/go-merkletree/db/pebble"
)
var (
// keyidx is used as key in the db to store the current Idx
keyidx = []byte("k:idx")
)
func (s *StateDB) resetZKInputs() {
s.zki = nil
s.i = 0 // initialize current transaction index in the ZKInputs generation
}
type processedExit struct {
exit bool
newExit bool
idx common.Idx
acc common.Account
}
// ProcessTxOutput contains the output of the ProcessTxs method
type ProcessTxOutput struct {
ZKInputs *common.ZKInputs
ExitInfos []common.ExitInfo
CreatedAccounts []common.Account
CoordinatorIdxsMap map[common.TokenID]common.Idx
CollectedFees map[common.TokenID]*big.Int
}
// ProcessTxs process the given L1Txs & L2Txs applying the needed updates to
// the StateDB depending on the transaction Type. If StateDB
// type==TypeBatchBuilder, returns the common.ZKInputs to generate the
// SnarkProof later used by the BatchBuilder. If StateDB
// type==TypeSynchronizer, assumes that the call is done from the Synchronizer,
// returns common.ExitTreeLeaf that is later used by the Synchronizer to update
// the HistoryDB, and adds Nonce & TokenID to the L2Txs.
// And if TypeSynchronizer returns an array of common.Account with all the
// created accounts.
func (s *StateDB) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinatortxs []common.L1Tx, l2txs []common.PoolL2Tx) (ptOut *ProcessTxOutput, err error) {
defer func() {
if err == nil {
err = s.MakeCheckpoint()
}
}()
var exitTree *merkletree.MerkleTree
var createdAccounts []common.Account
if s.zki != nil {
return nil, errors.New("Expected StateDB.zki==nil, something went wrong and it's not empty")
}
defer s.resetZKInputs()
nTx := len(l1usertxs) + len(l1coordinatortxs) + len(l2txs)
if nTx == 0 {
// TODO return ZKInputs of batch without txs
return &ProcessTxOutput{
ZKInputs: nil,
ExitInfos: nil,
CreatedAccounts: nil,
CoordinatorIdxsMap: nil,
CollectedFees: nil,
}, nil
}
exits := make([]processedExit, nTx)
// get TokenIDs of coordIdxs
coordIdxsMap, err := s.getTokenIDsFromIdxs(coordIdxs)
if err != nil {
return nil, err
}
var collectedFees map[common.TokenID]*big.Int
if s.typ == TypeSynchronizer {
collectedFees = make(map[common.TokenID]*big.Int)
for tokenID := range coordIdxsMap {
collectedFees[tokenID] = big.NewInt(0)
}
}
if s.typ == TypeBatchBuilder {
maxFeeTx := 2 // TODO this value will be a parameter
s.zki = common.NewZKInputs(nTx, maxFeeTx, s.mt.MaxLevels())
s.zki.OldLastIdx = (s.idx - 1).BigInt()
s.zki.OldStateRoot = s.mt.Root().BigInt()
}
// TBD if ExitTree is only in memory or stored in disk, for the moment
// only needed in memory
if s.typ == TypeSynchronizer || s.typ == TypeBatchBuilder {
tmpDir, err := ioutil.TempDir("", "hermez-statedb-exittree")
if err != nil {
return nil, err
}
defer func() {
if err := os.RemoveAll(tmpDir); err != nil {
log.Errorw("Deleting statedb temp exit tree", "err", err)
}
}()
sto, err := pebble.NewPebbleStorage(tmpDir, false)
if err != nil {
return nil, err
}
exitTree, err = merkletree.NewMerkleTree(sto, s.mt.MaxLevels())
if err != nil {
return nil, err
}
}
// assumption: l1usertx are sorted by L1Tx.Position
for i := 0; i < len(l1usertxs); i++ {
exitIdx, exitAccount, newExit, createdAccount, err := s.processL1Tx(exitTree, &l1usertxs[i])
if err != nil {
return nil, err
}
if s.typ == TypeSynchronizer || s.typ == TypeBatchBuilder {
if exitIdx != nil && exitTree != nil {
exits[s.i] = processedExit{
exit: true,
newExit: newExit,
idx: *exitIdx,
acc: *exitAccount,
}
}
s.i++
}
if s.typ == TypeSynchronizer && createdAccount != nil {
createdAccounts = append(createdAccounts, *createdAccount)
}
}
for i := 0; i < len(l1coordinatortxs); i++ {
exitIdx, _, _, createdAccount, err := s.processL1Tx(exitTree, &l1coordinatortxs[i])
if err != nil {
return nil, err
}
if exitIdx != nil {
log.Error("Unexpected Exit in L1CoordinatorTx")
}
if s.typ == TypeSynchronizer && createdAccount != nil {
createdAccounts = append(createdAccounts, *createdAccount)
}
}
for i := 0; i < len(l2txs); i++ {
exitIdx, exitAccount, newExit, err := s.processL2Tx(coordIdxsMap, collectedFees, exitTree, &l2txs[i])
if err != nil {
return nil, err
}
if s.typ == TypeSynchronizer || s.typ == TypeBatchBuilder {
if exitIdx != nil && exitTree != nil {
exits[s.i] = processedExit{
exit: true,
newExit: newExit,
idx: *exitIdx,
acc: *exitAccount,
}
}
s.i++
}
}
if s.typ == TypeTxSelector {
return nil, nil
}
// once all txs processed (exitTree root frozen), for each Exit,
// generate common.ExitInfo data
var exitInfos []common.ExitInfo
// exitInfos := []common.ExitInfo{}
for i := 0; i < nTx; i++ {
if !exits[i].exit {
continue
}
exitIdx := exits[i].idx
exitAccount := exits[i].acc
// 0. generate MerkleProof
p, err := exitTree.GenerateCircomVerifierProof(exitIdx.BigInt(), nil)
if err != nil {
return nil, err
}
// 1. generate common.ExitInfo
ei := common.ExitInfo{
AccountIdx: exitIdx,
MerkleProof: p,
Balance: exitAccount.Balance,
}
exitInfos = append(exitInfos, ei)
if s.zki != nil {
s.zki.TokenID2[i] = exitAccount.TokenID.BigInt()
s.zki.Nonce2[i] = exitAccount.Nonce.BigInt()
if babyjub.PointCoordSign(exitAccount.PublicKey.X) {
s.zki.Sign2[i] = big.NewInt(1)
}
s.zki.Ay2[i] = exitAccount.PublicKey.Y
s.zki.Balance2[i] = exitAccount.Balance
s.zki.EthAddr2[i] = common.EthAddrToBigInt(exitAccount.EthAddr)
for j := 0; j < len(p.Siblings); j++ {
s.zki.Siblings2[i][j] = p.Siblings[j].BigInt()
}
if exits[i].newExit {
s.zki.NewExit[i] = big.NewInt(1)
}
if p.IsOld0 {
s.zki.IsOld0_2[i] = big.NewInt(1)
}
s.zki.OldKey2[i] = p.OldKey.BigInt()
s.zki.OldValue2[i] = p.OldValue.BigInt()
}
}
if s.typ == TypeSynchronizer {
// return exitInfos, createdAccounts and collectedFees, so Synchronizer will
// be able to store it into HistoryDB for the concrete BatchNum
return &ProcessTxOutput{
ZKInputs: nil,
ExitInfos: exitInfos,
CreatedAccounts: createdAccounts,
CoordinatorIdxsMap: coordIdxsMap,
CollectedFees: collectedFees,
}, nil
}
// compute last ZKInputs parameters
s.zki.GlobalChainID = big.NewInt(0) // TODO, 0: ethereum, this will be get from config file
// zki.FeeIdxs = ? // TODO, this will be get from the config file
tokenIDs, err := s.getTokenIDsBigInt(l1usertxs, l1coordinatortxs, l2txs)
if err != nil {
log.Error(err)
return nil, err
}
s.zki.FeePlanTokens = tokenIDs
// s.zki.ISInitStateRootFee = s.mt.Root().BigInt()
// TODO once the Node Config sets the Accounts where to send the Fees
// compute fees & update ZKInputs
// return ZKInputs as the BatchBuilder will return it to forge the Batch
return &ProcessTxOutput{
ZKInputs: s.zki,
ExitInfos: nil,
CreatedAccounts: nil,
CoordinatorIdxsMap: coordIdxsMap,
CollectedFees: nil,
}, nil
}
// getTokenIDsBigInt returns the list of TokenIDs in *big.Int format
func (s *StateDB) getTokenIDsBigInt(l1usertxs, l1coordinatortxs []common.L1Tx, l2txs []common.PoolL2Tx) ([]*big.Int, error) {
tokenIDs := make(map[common.TokenID]bool)
for i := 0; i < len(l1usertxs); i++ {
tokenIDs[l1usertxs[i].TokenID] = true
}
for i := 0; i < len(l1coordinatortxs); i++ {
tokenIDs[l1coordinatortxs[i].TokenID] = true
}
for i := 0; i < len(l2txs); i++ {
// as L2Tx does not have parameter TokenID, get it from the
// AccountsDB (in the StateDB)
acc, err := s.GetAccount(l2txs[i].FromIdx)
if err != nil {
log.Errorf("could not get account to determine TokenID of L2Tx: FromIdx %d not found: %s", l2txs[i].FromIdx, err.Error())
return nil, err
}
tokenIDs[acc.TokenID] = true
}
var tBI []*big.Int
for t := range tokenIDs {
tBI = append(tBI, t.BigInt())
}
return tBI, nil
}
// processL1Tx process the given L1Tx applying the needed updates to the
// StateDB depending on the transaction Type. It returns the 3 parameters
// related to the Exit (in case of): Idx, ExitAccount, boolean determining if
// the Exit created a new Leaf in the ExitTree.
// And another *common.Account parameter which contains the created account in
// case that has been a new created account and that the StateDB is of type
// TypeSynchronizer.
func (s *StateDB) processL1Tx(exitTree *merkletree.MerkleTree, tx *common.L1Tx) (*common.Idx, *common.Account, bool, *common.Account, error) {
// ZKInputs
if s.zki != nil {
// Txs
// s.zki.TxCompressedData[s.i] = tx.TxCompressedData() // uncomment once L1Tx.TxCompressedData is ready
s.zki.FromIdx[s.i] = tx.FromIdx.BigInt()
s.zki.ToIdx[s.i] = tx.ToIdx.BigInt()
s.zki.OnChain[s.i] = big.NewInt(1)
// L1Txs
s.zki.LoadAmountF[s.i] = tx.LoadAmount
s.zki.FromEthAddr[s.i] = common.EthAddrToBigInt(tx.FromEthAddr)
if tx.FromBJJ != nil {
s.zki.FromBJJCompressed[s.i] = BJJCompressedTo256BigInts(tx.FromBJJ.Compress())
}
// Intermediate States, for all the transactions except for the last one
if s.i < len(s.zki.ISOnChain) { // len(s.zki.ISOnChain) == nTx
s.zki.ISOnChain[s.i] = big.NewInt(1)
}
}
switch tx.Type {
case common.TxTypeForceTransfer:
// go to the MT account of sender and receiver, and update balance
// & nonce
// coordIdxsMap is 'nil', as at L1Txs there is no L2 fees
// 0 for the parameter toIdx, as at L1Tx ToIdx can only be 0 in the Deposit type case.
err := s.applyTransfer(nil, nil, tx.Tx(), 0)
if err != nil {
log.Error(err)
return nil, nil, false, nil, err
}
case common.TxTypeCreateAccountDeposit:
// add new account to the MT, update balance of the MT account
err := s.applyCreateAccount(tx)
if err != nil {
log.Error(err)
return nil, nil, false, nil, err
}
// TODO applyCreateAccount will return the created account,
// which in the case type==TypeSynchronizer will be added to an
// array of created accounts that will be returned
if s.zki != nil {
s.zki.AuxFromIdx[s.i] = s.idx.BigInt() // last s.idx is the one used for creating the new account
s.zki.NewAccount[s.i] = big.NewInt(1)
}
case common.TxTypeDeposit:
// update balance of the MT account
err := s.applyDeposit(tx, false)
if err != nil {
log.Error(err)
return nil, nil, false, nil, err
}
case common.TxTypeDepositTransfer:
// update balance in MT account, update balance & nonce of sender
// & receiver
err := s.applyDeposit(tx, true)
if err != nil {
log.Error(err)
return nil, nil, false, nil, err
}
case common.TxTypeCreateAccountDepositTransfer:
// add new account to the merkletree, update balance in MT account,
// update balance & nonce of sender & receiver
err := s.applyCreateAccountDepositTransfer(tx)
if err != nil {
log.Error(err)
return nil, nil, false, nil, err
}
if s.zki != nil {
s.zki.AuxFromIdx[s.i] = s.idx.BigInt() // last s.idx is the one used for creating the new account
s.zki.NewAccount[s.i] = big.NewInt(1)
}
case common.TxTypeForceExit:
// execute exit flow
// coordIdxsMap is 'nil', as at L1Txs there is no L2 fees
exitAccount, newExit, err := s.applyExit(nil, nil, exitTree, tx.Tx())
if err != nil {
log.Error(err)
return nil, nil, false, nil, err
}
return &tx.FromIdx, exitAccount, newExit, nil, nil
default:
}
var createdAccount *common.Account
if s.typ == TypeSynchronizer && (tx.Type == common.TxTypeCreateAccountDeposit || tx.Type == common.TxTypeCreateAccountDepositTransfer) {
var err error
createdAccount, err = s.GetAccount(s.idx)
if err != nil {
log.Error(err)
return nil, nil, false, nil, err
}
}
return nil, nil, false, createdAccount, nil
}
// processL2Tx process the given L2Tx applying the needed updates to the
// StateDB depending on the transaction Type. It returns the 3 parameters
// related to the Exit (in case of): Idx, ExitAccount, boolean determining if
// the Exit created a new Leaf in the ExitTree.
func (s *StateDB) processL2Tx(coordIdxsMap map[common.TokenID]common.Idx, collectedFees map[common.TokenID]*big.Int,
exitTree *merkletree.MerkleTree, tx *common.PoolL2Tx) (*common.Idx, *common.Account, bool, error) {
var err error
// if tx.ToIdx==0, get toIdx by ToEthAddr or ToBJJ
if tx.ToIdx == common.Idx(0) && tx.AuxToIdx == common.Idx(0) {
// case when tx.Type== common.TxTypeTransferToEthAddr or common.TxTypeTransferToBJJ
tx.AuxToIdx, err = s.GetIdxByEthAddrBJJ(tx.ToEthAddr, tx.ToBJJ, tx.TokenID)
if err != nil {
return nil, nil, false, err
}
}
// ZKInputs
if s.zki != nil {
// Txs
// s.zki.TxCompressedData[s.i] = tx.TxCompressedData() // uncomment once L1Tx.TxCompressedData is ready
// s.zki.TxCompressedDataV2[s.i] = tx.TxCompressedDataV2() // uncomment once L2Tx.TxCompressedDataV2 is ready
s.zki.FromIdx[s.i] = tx.FromIdx.BigInt()
s.zki.ToIdx[s.i] = tx.ToIdx.BigInt()
// fill AuxToIdx if needed
if tx.ToIdx == 0 {
// use toIdx that can have been filled by tx.ToIdx or
// if tx.Idx==0 (this case), toIdx is filled by the Idx
// from db by ToEthAddr&ToBJJ
s.zki.AuxToIdx[s.i] = tx.AuxToIdx.BigInt()
}
if tx.ToBJJ != nil {
s.zki.ToBJJAy[s.i] = tx.ToBJJ.Y
}
s.zki.ToEthAddr[s.i] = common.EthAddrToBigInt(tx.ToEthAddr)
s.zki.OnChain[s.i] = big.NewInt(0)
s.zki.NewAccount[s.i] = big.NewInt(0)
// L2Txs
// s.zki.RqOffset[s.i] = // TODO Rq once TxSelector is ready
// s.zki.RqTxCompressedDataV2[s.i] = // TODO
// s.zki.RqToEthAddr[s.i] = common.EthAddrToBigInt(tx.RqToEthAddr) // TODO
// s.zki.RqToBJJAy[s.i] = tx.ToBJJ.Y // TODO
signature, err := tx.Signature.Decompress()
if err != nil {
log.Error(err)
return nil, nil, false, err
}
s.zki.S[s.i] = signature.S
s.zki.R8x[s.i] = signature.R8.X
s.zki.R8y[s.i] = signature.R8.Y
}
// if StateDB type==TypeSynchronizer, will need to add Nonce
if s.typ == TypeSynchronizer {
// as type==TypeSynchronizer, always tx.ToIdx!=0
acc, err := s.GetAccount(tx.FromIdx)
if err != nil {
log.Errorw("GetAccount", "fromIdx", tx.FromIdx, "err", err)
return nil, nil, false, err
}
tx.Nonce = acc.Nonce + 1
tx.TokenID = acc.TokenID
}
switch tx.Type {
case common.TxTypeTransfer, common.TxTypeTransferToEthAddr, common.TxTypeTransferToBJJ:
// go to the MT account of sender and receiver, and update
// balance & nonce
err = s.applyTransfer(coordIdxsMap, collectedFees, tx.Tx(), tx.AuxToIdx)
if err != nil {
log.Error(err)
return nil, nil, false, err
}
case common.TxTypeExit:
// execute exit flow
exitAccount, newExit, err := s.applyExit(coordIdxsMap, collectedFees, exitTree, tx.Tx())
if err != nil {
log.Error(err)
return nil, nil, false, err
}
return &tx.FromIdx, exitAccount, newExit, nil
default:
}
return nil, nil, false, nil
}
// applyCreateAccount creates a new account in the account of the depositer, it
// stores the deposit value
func (s *StateDB) applyCreateAccount(tx *common.L1Tx) error {
account := &common.Account{
TokenID: tx.TokenID,
Nonce: 0,
Balance: tx.LoadAmount,
PublicKey: tx.FromBJJ,
EthAddr: tx.FromEthAddr,
}
p, err := s.CreateAccount(common.Idx(s.idx+1), account)
if err != nil {
return err
}
if s.zki != nil {
s.zki.TokenID1[s.i] = tx.TokenID.BigInt()
s.zki.Nonce1[s.i] = big.NewInt(0)
if babyjub.PointCoordSign(tx.FromBJJ.X) {
s.zki.Sign1[s.i] = big.NewInt(1)
}
s.zki.Ay1[s.i] = tx.FromBJJ.Y
s.zki.Balance1[s.i] = tx.LoadAmount
s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(tx.FromEthAddr)
s.zki.Siblings1[s.i] = siblingsToZKInputFormat(p.Siblings)
if p.IsOld0 {
s.zki.IsOld0_1[s.i] = big.NewInt(1)
}
s.zki.OldKey1[s.i] = p.OldKey.BigInt()
s.zki.OldValue1[s.i] = p.OldValue.BigInt()
}
s.idx = s.idx + 1
return s.setIdx(s.idx)
}
// applyDeposit updates the balance in the account of the depositer, if
// andTransfer parameter is set to true, the method will also apply the
// Transfer of the L1Tx/DepositTransfer
func (s *StateDB) applyDeposit(tx *common.L1Tx, transfer bool) error {
// deposit the tx.LoadAmount into the sender account
accSender, err := s.GetAccount(tx.FromIdx)
if err != nil {
return err
}
accSender.Balance = new(big.Int).Add(accSender.Balance, tx.LoadAmount)
// in case that the tx is a L1Tx>DepositTransfer
var accReceiver *common.Account
if transfer {
accReceiver, err = s.GetAccount(tx.ToIdx)
if err != nil {
return err
}
// subtract amount to the sender
accSender.Balance = new(big.Int).Sub(accSender.Balance, tx.Amount)
// add amount to the receiver
accReceiver.Balance = new(big.Int).Add(accReceiver.Balance, tx.Amount)
}
// update sender account in localStateDB
p, err := s.UpdateAccount(tx.FromIdx, accSender)
if err != nil {
return err
}
if s.zki != nil {
s.zki.TokenID1[s.i] = accSender.TokenID.BigInt()
s.zki.Nonce1[s.i] = accSender.Nonce.BigInt()
if babyjub.PointCoordSign(accSender.PublicKey.X) {
s.zki.Sign1[s.i] = big.NewInt(1)
}
s.zki.Ay1[s.i] = accSender.PublicKey.Y
s.zki.Balance1[s.i] = accSender.Balance
s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(accSender.EthAddr)
s.zki.Siblings1[s.i] = siblingsToZKInputFormat(p.Siblings)
// IsOld0_1, OldKey1, OldValue1 not needed as this is not an insert
}
// this is done after updating Sender Account (depositer)
if transfer {
// update receiver account in localStateDB
p, err := s.UpdateAccount(tx.ToIdx, accReceiver)
if err != nil {
return err
}
if s.zki != nil {
s.zki.TokenID2[s.i] = accReceiver.TokenID.BigInt()
s.zki.Nonce2[s.i] = accReceiver.Nonce.BigInt()
if babyjub.PointCoordSign(accReceiver.PublicKey.X) {
s.zki.Sign2[s.i] = big.NewInt(1)
}
s.zki.Ay2[s.i] = accReceiver.PublicKey.Y
s.zki.Balance2[s.i] = accReceiver.Balance
s.zki.EthAddr2[s.i] = common.EthAddrToBigInt(accReceiver.EthAddr)
s.zki.Siblings2[s.i] = siblingsToZKInputFormat(p.Siblings)
// IsOld0_2, OldKey2, OldValue2 not needed as this is not an insert
}
}
return nil
}
// applyTransfer updates the balance & nonce in the account of the sender, and
// the balance in the account of the receiver.
// Parameter 'toIdx' should be at 0 if the tx already has tx.ToIdx!=0, if
// tx.ToIdx==0, then toIdx!=0, and will be used the toIdx parameter as Idx of
// the receiver. This parameter is used when the tx.ToIdx is not specified and
// the real ToIdx is found trhrough the ToEthAddr or ToBJJ.
func (s *StateDB) applyTransfer(coordIdxsMap map[common.TokenID]common.Idx, collectedFees map[common.TokenID]*big.Int,
tx common.Tx, auxToIdx common.Idx) error {
if auxToIdx == common.Idx(0) {
auxToIdx = tx.ToIdx
}
// get sender and receiver accounts from localStateDB
accSender, err := s.GetAccount(tx.FromIdx)
if err != nil {
log.Error(err)
return err
}
accReceiver, err := s.GetAccount(auxToIdx)
if err != nil {
log.Error(err)
return err
}
// increment nonce
accSender.Nonce++
if !tx.IsL1 {
// compute fee and subtract it from the accSender
fee, err := common.CalcFeeAmount(tx.Amount, *tx.Fee)
if err != nil {
return err
}
feeAndAmount := new(big.Int).Add(tx.Amount, fee)
accSender.Balance = new(big.Int).Sub(accSender.Balance, feeAndAmount)
// send the fee to the Idx of the Coordinator for the TokenID
accCoord, err := s.GetAccount(coordIdxsMap[accSender.TokenID])
if err != nil {
log.Debugw("No coord Idx to receive fee", "tx", tx)
} else {
accCoord.Balance = new(big.Int).Add(accCoord.Balance, fee)
_, err = s.UpdateAccount(coordIdxsMap[accSender.TokenID], accCoord)
if err != nil {
log.Error(err)
return err
}
if s.typ == TypeSynchronizer {
collected := collectedFees[accSender.TokenID]
collected.Add(collected, fee)
}
}
} else {
accSender.Balance = new(big.Int).Sub(accSender.Balance, tx.Amount)
}
// add amount-feeAmount to the receiver
accReceiver.Balance = new(big.Int).Add(accReceiver.Balance, tx.Amount)
// update sender account in localStateDB
pSender, err := s.UpdateAccount(tx.FromIdx, accSender)
if err != nil {
log.Error(err)
return err
}
if s.zki != nil {
s.zki.TokenID1[s.i] = accSender.TokenID.BigInt()
s.zki.Nonce1[s.i] = accSender.Nonce.BigInt()
if babyjub.PointCoordSign(accSender.PublicKey.X) {
s.zki.Sign1[s.i] = big.NewInt(1)
}
s.zki.Ay1[s.i] = accSender.PublicKey.Y
s.zki.Balance1[s.i] = accSender.Balance
s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(accSender.EthAddr)
s.zki.Siblings1[s.i] = siblingsToZKInputFormat(pSender.Siblings)
}
// update receiver account in localStateDB
pReceiver, err := s.UpdateAccount(auxToIdx, accReceiver)
if err != nil {
return err
}
if s.zki != nil {
s.zki.TokenID2[s.i] = accReceiver.TokenID.BigInt()
s.zki.Nonce2[s.i] = accReceiver.Nonce.BigInt()
if babyjub.PointCoordSign(accReceiver.PublicKey.X) {
s.zki.Sign2[s.i] = big.NewInt(1)
}
s.zki.Ay2[s.i] = accReceiver.PublicKey.Y
s.zki.Balance2[s.i] = accReceiver.Balance
s.zki.EthAddr2[s.i] = common.EthAddrToBigInt(accReceiver.EthAddr)
s.zki.Siblings2[s.i] = siblingsToZKInputFormat(pReceiver.Siblings)
}
return nil
}
// applyCreateAccountDepositTransfer, in a single tx, creates a new account,
// makes a deposit, and performs a transfer to another account
func (s *StateDB) applyCreateAccountDepositTransfer(tx *common.L1Tx) error {
accSender := &common.Account{
TokenID: tx.TokenID,
Nonce: 0,
Balance: tx.LoadAmount,
PublicKey: tx.FromBJJ,
EthAddr: tx.FromEthAddr,
}
accReceiver, err := s.GetAccount(tx.ToIdx)
if err != nil {
return err
}
// subtract amount to the sender
accSender.Balance = new(big.Int).Sub(accSender.Balance, tx.Amount)
// add amount to the receiver
accReceiver.Balance = new(big.Int).Add(accReceiver.Balance, tx.Amount)
// create Account of the Sender
p, err := s.CreateAccount(common.Idx(s.idx+1), accSender)
if err != nil {
return err
}
if s.zki != nil {
s.zki.TokenID1[s.i] = tx.TokenID.BigInt()
s.zki.Nonce1[s.i] = big.NewInt(0)
if babyjub.PointCoordSign(tx.FromBJJ.X) {
s.zki.Sign1[s.i] = big.NewInt(1)
}
s.zki.Ay1[s.i] = tx.FromBJJ.Y
s.zki.Balance1[s.i] = tx.LoadAmount
s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(tx.FromEthAddr)
s.zki.Siblings1[s.i] = siblingsToZKInputFormat(p.Siblings)
if p.IsOld0 {
s.zki.IsOld0_1[s.i] = big.NewInt(1)
}
s.zki.OldKey1[s.i] = p.OldKey.BigInt()
s.zki.OldValue1[s.i] = p.OldValue.BigInt()
}
// update receiver account in localStateDB
p, err = s.UpdateAccount(tx.ToIdx, accReceiver)
if err != nil {
return err
}
if s.zki != nil {
s.zki.TokenID2[s.i] = accReceiver.TokenID.BigInt()
s.zki.Nonce2[s.i] = accReceiver.Nonce.BigInt()
if babyjub.PointCoordSign(accReceiver.PublicKey.X) {
s.zki.Sign2[s.i] = big.NewInt(1)
}
s.zki.Ay2[s.i] = accReceiver.PublicKey.Y
s.zki.Balance2[s.i] = accReceiver.Balance
s.zki.EthAddr2[s.i] = common.EthAddrToBigInt(accReceiver.EthAddr)
s.zki.Siblings2[s.i] = siblingsToZKInputFormat(p.Siblings)
}
s.idx = s.idx + 1
return s.setIdx(s.idx)
}
// It returns the ExitAccount and a boolean determining if the Exit created a
// new Leaf in the ExitTree.
func (s *StateDB) applyExit(coordIdxsMap map[common.TokenID]common.Idx, collectedFees map[common.TokenID]*big.Int,
exitTree *merkletree.MerkleTree, tx common.Tx) (*common.Account, bool, error) {
// 0. subtract tx.Amount from current Account in StateMT
// add the tx.Amount into the Account (tx.FromIdx) in the ExitMT
acc, err := s.GetAccount(tx.FromIdx)
if err != nil {
return nil, false, err
}
if !tx.IsL1 {
// compute fee and subtract it from the accSender
fee, err := common.CalcFeeAmount(tx.Amount, *tx.Fee)
if err != nil {
return nil, false, err
}
feeAndAmount := new(big.Int).Add(tx.Amount, fee)
acc.Balance = new(big.Int).Sub(acc.Balance, feeAndAmount)
// send the fee to the Idx of the Coordinator for the TokenID
accCoord, err := s.GetAccount(coordIdxsMap[acc.TokenID])
if err != nil {
log.Debugw("No coord Idx to receive fee", "tx", tx)
} else {
accCoord.Balance = new(big.Int).Add(accCoord.Balance, fee)
_, err = s.UpdateAccount(coordIdxsMap[acc.TokenID], accCoord)
if err != nil {
log.Error(err)
return nil, false, err
}
if s.typ == TypeSynchronizer {
collected := collectedFees[acc.TokenID]
collected.Add(collected, fee)
}
}
} else {
acc.Balance = new(big.Int).Sub(acc.Balance, tx.Amount)
}
p, err := s.UpdateAccount(tx.FromIdx, acc)
if err != nil {
return nil, false, err
}
if s.zki != nil {
s.zki.TokenID1[s.i] = acc.TokenID.BigInt()
s.zki.Nonce1[s.i] = acc.Nonce.BigInt()
if babyjub.PointCoordSign(acc.PublicKey.X) {
s.zki.Sign1[s.i] = big.NewInt(1)
}
s.zki.Ay1[s.i] = acc.PublicKey.Y
s.zki.Balance1[s.i] = acc.Balance
s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(acc.EthAddr)
s.zki.Siblings1[s.i] = siblingsToZKInputFormat(p.Siblings)
}
if exitTree == nil {
return nil, false, nil
}
exitAccount, err := getAccountInTreeDB(exitTree.DB(), tx.FromIdx)
if err == db.ErrNotFound {
// 1a. if idx does not exist in exitTree:
// add new leaf 'ExitTreeLeaf', where ExitTreeLeaf.Balance = exitAmount (exitAmount=tx.Amount)
exitAccount := &common.Account{
TokenID: acc.TokenID,
Nonce: common.Nonce(1),
Balance: tx.Amount,
PublicKey: acc.PublicKey,
EthAddr: acc.EthAddr,
}
_, err = createAccountInTreeDB(exitTree.DB(), exitTree, tx.FromIdx, exitAccount)
return exitAccount, true, err
} else if err != nil {
return exitAccount, false, err
}
// 1b. if idx already exist in exitTree:
// update account, where account.Balance += exitAmount
exitAccount.Balance = new(big.Int).Add(exitAccount.Balance, tx.Amount)
_, err = updateAccountInTreeDB(exitTree.DB(), exitTree, tx.FromIdx, exitAccount)
return exitAccount, false, err
}
// getIdx returns the stored Idx from the localStateDB, which is the last Idx
// used for an Account in the localStateDB.
func (s *StateDB) getIdx() (common.Idx, error) {
idxBytes, err := s.DB().Get(keyidx)
if err == db.ErrNotFound {
return 0, nil
}
if err != nil {
return 0, err
}
return common.IdxFromBytes(idxBytes[:])
}
// setIdx stores Idx in the localStateDB
func (s *StateDB) setIdx(idx common.Idx) error {
tx, err := s.DB().NewTx()
if err != nil {
return err
}
idxBytes, err := idx.Bytes()
if err != nil {
return err
}
err = tx.Put(keyidx, idxBytes[:])
if err != nil {
return err
}
if err := tx.Commit(); err != nil {
return err
}
return nil
}