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package batchbuilder
import (
"encoding/binary"
"math/big"
ethCommon "github.com/ethereum/go-ethereum/common"
"github.com/hermeznetwork/hermez-node/common"
"github.com/hermeznetwork/hermez-node/db/statedb"
"github.com/iden3/go-merkletree/db"
)
// KEYIDX is used as key in the db to store the current Idx
var KEYIDX = []byte("idx")
// ConfigCircuit contains the circuit configuration
type ConfigCircuit struct {
TxsMax uint64
L1TxsMax uint64
SMTLevelsMax uint64
}
// BatchBuilder implements the batch builder type, which contains the
// functionalities
type BatchBuilder struct {
// idx holds the current Idx that the BatchBuilder is using
idx uint64
localStateDB *statedb.LocalStateDB
configCircuits []ConfigCircuit
}
// ConfigBatch contains the batch configuration
type ConfigBatch struct {
ForgerAddress ethCommon.Address
}
// NewBatchBuilder constructs a new BatchBuilder, and executes the bb.Reset
// method
func NewBatchBuilder(dbpath string, synchronizerStateDB *statedb.StateDB, configCircuits []ConfigCircuit, batchNum uint64, nLevels uint64) (*BatchBuilder, error) {
localStateDB, err := statedb.NewLocalStateDB(dbpath, synchronizerStateDB, true, int(nLevels))
if err != nil {
return nil, err
}
bb := BatchBuilder{
localStateDB: localStateDB,
configCircuits: configCircuits,
}
err = bb.Reset(batchNum, true)
return &bb, err
}
// Reset tells the BatchBuilder to reset it's internal state to the required
// `batchNum`. If `fromSynchronizer` is true, the BatchBuilder must take a
// copy of the rollup state from the Synchronizer at that `batchNum`, otherwise
// it can just roll back the internal copy.
func (bb *BatchBuilder) Reset(batchNum uint64, fromSynchronizer bool) error {
if batchNum == 0 {
bb.idx = 0
return nil
}
err := bb.localStateDB.Reset(batchNum, fromSynchronizer)
if err != nil {
return err
}
// idx is obtained from the statedb reset
bb.idx, err = bb.getIdx()
return err
}
// BuildBatch takes the transactions and returns the common.ZKInputs of the next batch
func (bb *BatchBuilder) BuildBatch(configBatch ConfigBatch, l1usertxs, l1coordinatortxs []*common.L1Tx, l2txs []*common.PoolL2Tx, tokenIDs []common.TokenID) (*common.ZKInputs, error) {
for _, tx := range l1usertxs {
err := bb.processL1Tx(tx)
if err != nil {
return nil, err
}
}
for _, tx := range l1coordinatortxs {
err := bb.processL1Tx(tx)
if err != nil {
return nil, err
}
}
for _, tx := range l2txs {
switch tx.Type {
case common.TxTypeTransfer:
// go to the MT account of sender and receiver, and update
// balance & nonce
err := bb.applyTransfer(tx.Tx())
if err != nil {
return nil, err
}
case common.TxTypeExit:
// execute exit flow
default:
}
}
return nil, nil
}
func (bb *BatchBuilder) processL1Tx(tx *common.L1Tx) error {
switch tx.Type {
case common.TxTypeForceTransfer, common.TxTypeTransfer:
// go to the MT account of sender and receiver, and update balance
// & nonce
err := bb.applyTransfer(tx.Tx())
if err != nil {
return err
}
case common.TxTypeCreateAccountDeposit:
// add new account to the MT, update balance of the MT account
err := bb.applyCreateAccount(tx)
if err != nil {
return err
}
case common.TxTypeDeposit: // TODO check if this type will ever exist, or will be TxTypeDepositAndTransfer with transfer 0 value
// update balance of the MT account
err := bb.applyDeposit(tx, false)
if err != nil {
return err
}
case common.TxTypeDepositAndTransfer:
// update balance in MT account, update balance & nonce of sender
// & receiver
err := bb.applyDeposit(tx, true)
if err != nil {
return err
}
case common.TxTypeCreateAccountDepositAndTransfer:
// add new account to the merkletree, update balance in MT account,
// update balance & nonce of sender & receiver
err := bb.applyCreateAccount(tx)
if err != nil {
return err
}
err = bb.applyTransfer(tx.Tx())
if err != nil {
return err
}
case common.TxTypeExit:
// execute exit flow
default:
}
return nil
}
// applyCreateAccount creates a new account in the account of the depositer, it
// stores the deposit value
func (bb *BatchBuilder) applyCreateAccount(tx *common.L1Tx) error {
account := &common.Account{
TokenID: tx.TokenID,
Nonce: 0,
Balance: tx.LoadAmount,
PublicKey: tx.FromBJJ,
EthAddr: tx.FromEthAddr,
}
err := bb.localStateDB.CreateAccount(common.Idx(bb.idx+1), account)
if err != nil {
return err
}
bb.idx = bb.idx + 1
return bb.setIdx(bb.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/DepositAndTransfer
func (bb *BatchBuilder) applyDeposit(tx *common.L1Tx, transfer bool) error {
// deposit the tx.LoadAmount into the sender account
accSender, err := bb.localStateDB.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>DepositAndTransfer
if transfer {
accReceiver, err := bb.localStateDB.GetAccount(tx.ToIdx)
if err != nil {
return err
}
// substract 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 receiver account in localStateDB
err = bb.localStateDB.UpdateAccount(tx.ToIdx, accReceiver)
if err != nil {
return err
}
}
// update sender account in localStateDB
err = bb.localStateDB.UpdateAccount(tx.FromIdx, accSender)
if err != nil {
return err
}
return nil
}
// applyTransfer updates the balance & nonce in the account of the sender, and
// the balance in the account of the receiver
func (bb *BatchBuilder) applyTransfer(tx *common.Tx) error {
// get sender and receiver accounts from localStateDB
accSender, err := bb.localStateDB.GetAccount(tx.FromIdx)
if err != nil {
return err
}
accReceiver, err := bb.localStateDB.GetAccount(tx.ToIdx)
if err != nil {
return err
}
// substract 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 receiver account in localStateDB
err = bb.localStateDB.UpdateAccount(tx.ToIdx, accReceiver)
if err != nil {
return err
}
// update sender account in localStateDB
err = bb.localStateDB.UpdateAccount(tx.FromIdx, accSender)
if err != nil {
return err
}
return nil
}
// getIdx returns the stored Idx from the localStateDB, which is the last Idx used for an Account in the localStateDB.
func (bb *BatchBuilder) getIdx() (uint64, error) {
idxBytes, err := bb.localStateDB.DB().Get(KEYIDX)
if err == db.ErrNotFound {
return 0, nil
}
if err != nil {
return 0, err
}
idx := binary.LittleEndian.Uint64(idxBytes[:8])
return idx, nil
}
// setIdx stores Idx in the localStateDB
func (bb *BatchBuilder) setIdx(idx uint64) error {
tx, err := bb.localStateDB.DB().NewTx()
if err != nil {
return err
}
var idxBytes [8]byte
binary.LittleEndian.PutUint64(idxBytes[:], idx)
tx.Put(KEYIDX, idxBytes[:])
if err := tx.Commit(); err != nil {
return err
}
return nil
}