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package txselector
// current: very simple version of TxSelector
import (
"bytes"
"math/big"
"sort"
ethCommon "github.com/ethereum/go-ethereum/common"
"github.com/hermeznetwork/hermez-node/common"
"github.com/hermeznetwork/hermez-node/db/l2db"
"github.com/hermeznetwork/hermez-node/db/statedb"
"github.com/hermeznetwork/hermez-node/log"
"github.com/iden3/go-iden3-crypto/babyjub"
)
// txs implements the interface Sort for an array of Tx
type txs []common.PoolL2Tx
func (t txs) Len() int {
return len(t)
}
func (t txs) Swap(i, j int) {
t[i], t[j] = t[j], t[i]
}
func (t txs) Less(i, j int) bool {
return *t[i].AbsoluteFee > *t[j].AbsoluteFee
}
// TxSelector implements all the functionalities to select the txs for the next batch
type TxSelector struct {
// MaxL1UserTxs is the maximum L1-user-tx for a batch
MaxL1UserTxs uint64
// MaxL1OperatorTxs is the maximum L1-operator-tx for a batch
MaxL1OperatorTxs uint64
// MaxTxs is the maximum txs for a batch
MaxTxs uint64
l2db *l2db.L2DB
localAccountsDB *statedb.LocalStateDB
}
// NewTxSelector returns a *TxSelector
func NewTxSelector(dbpath string, synchronizerStateDB *statedb.StateDB, l2 *l2db.L2DB, maxL1UserTxs, maxL1OperatorTxs, maxTxs uint64) (*TxSelector, error) {
localAccountsDB, err := statedb.NewLocalStateDB(dbpath, synchronizerStateDB, statedb.TypeTxSelector, 0) // without merkletree
if err != nil {
return nil, err
}
return &TxSelector{
MaxL1UserTxs: maxL1UserTxs,
MaxL1OperatorTxs: maxL1OperatorTxs,
MaxTxs: maxTxs,
l2db: l2,
localAccountsDB: localAccountsDB,
}, nil
}
// Reset tells the TxSelector to get it's internal AccountsDB
// from the required `batchNum`
func (txsel *TxSelector) Reset(batchNum common.BatchNum) error {
err := txsel.localAccountsDB.Reset(batchNum, true)
if err != nil {
return err
}
return nil
}
// GetL2TxSelection returns a selection of the L2Txs for the next batch, from the L2DB pool
func (txsel *TxSelector) GetL2TxSelection(batchNum common.BatchNum) ([]common.PoolL2Tx, error) {
// get pending l2-tx from tx-pool
l2TxsRaw, err := txsel.l2db.GetPendingTxs() // once l2db ready, maybe use parameter 'batchNum'
if err != nil {
return nil, err
}
// discard the txs that don't have an Account in the AccountDB
var validTxs txs
for _, tx := range l2TxsRaw {
_, err = txsel.localAccountsDB.GetAccount(&tx.FromIdx)
if err == nil {
// if FromIdx has an account into the AccountsDB
validTxs = append(validTxs, tx)
}
}
// get most profitable L2-tx
txs := txsel.getL2Profitable(validTxs, txsel.MaxTxs)
// process the txs in the local AccountsDB
_, _, err = txsel.localAccountsDB.ProcessTxs(nil, nil, txs)
if err != nil {
return nil, err
}
err = txsel.localAccountsDB.MakeCheckpoint()
return txs, err
}
// GetL1L2TxSelection returns the selection of L1 + L2 txs
func (txsel *TxSelector) GetL1L2TxSelection(batchNum common.BatchNum, l1Txs []common.L1Tx) ([]common.L1Tx, []common.L1Tx, []common.PoolL2Tx, error) {
// apply l1-user-tx to localAccountDB
// create new leaves
// update balances
// update nonces
// get pending l2-tx from tx-pool
l2TxsRaw, err := txsel.l2db.GetPendingTxs() // (batchID)
if err != nil {
return nil, nil, nil, err
}
var validTxs txs
var l1CoordinatorTxs []common.L1Tx
positionL1 := len(l1Txs)
// if tx.ToIdx>=256, tx.ToIdx should exist to localAccountsDB, if so,
// tx is used. if tx.ToIdx==0, check if tx.ToEthAddr/tx.ToBJJ exist in
// localAccountsDB, if yes tx is used; if not, check if tx.ToEthAddr is
// in AccountCreationAuthDB, if so, tx is used and L1CoordinatorTx of
// CreateAccountAndDeposit is created.
for i := 0; i < len(l2TxsRaw); i++ {
if l2TxsRaw[i].ToIdx == nil {
if checkAlreadyPendingToCreate(l1CoordinatorTxs, l2TxsRaw[i].ToEthAddr, l2TxsRaw[i].ToBJJ) {
// if L2Tx needs a new L1CoordinatorTx of CreateAccount type,
// and a previous L2Tx in the current process already created
// a L1CoordinatorTx of this type, in the DB there still seem
// that needs to create a new L1CoordinatorTx, but as is already
// created, the tx is valid
validTxs = append(validTxs, l2TxsRaw[i])
continue
}
if !bytes.Equal(l2TxsRaw[i].ToEthAddr.Bytes(), common.EmptyAddr.Bytes()) &&
!bytes.Equal(l2TxsRaw[i].ToEthAddr.Bytes(), common.FFAddr.Bytes()) {
// case: ToEthAddr != 0x00 neither 0xff
var accAuth *common.AccountCreationAuth
if l2TxsRaw[i].ToBJJ != nil {
// case: ToBJJ!=0:
// if idx exist for EthAddr&BJJ use it
_, err := txsel.localAccountsDB.GetIdxByEthAddrBJJ(l2TxsRaw[i].ToEthAddr, l2TxsRaw[i].ToBJJ)
if err == nil {
// account for ToEthAddr&ToBJJ already exist,
// there is no need to create a new one.
// tx valid, StateDB will use the ToIdx==0 to define the AuxToIdx
validTxs = append(validTxs, l2TxsRaw[i])
continue
}
// if not, check if AccountCreationAuth exist for that ToEthAddr&BJJ
// accAuth, err = txsel.l2db.GetAccountCreationAuthBJJ(l2TxsRaw[i].ToEthAddr, l2TxsRaw[i].ToBJJ)
accAuth, err = txsel.l2db.GetAccountCreationAuth(l2TxsRaw[i].ToEthAddr)
if err != nil {
// not found, l2Tx will not be added in the selection
log.Debugw("invalid L2Tx: ToIdx not found in StateDB, neither ToEthAddr & ToBJJ found in AccountCreationAuths L2DB", "ToIdx", l2TxsRaw[i].ToIdx, "ToEthAddr", l2TxsRaw[i].ToEthAddr)
continue
}
if accAuth.BJJ != l2TxsRaw[i].ToBJJ {
// if AccountCreationAuth.BJJ is not the same than in the tx, tx is not accepted
log.Debugw("invalid L2Tx: ToIdx not found in StateDB, neither ToEthAddr & ToBJJ found in AccountCreationAuths L2DB", "ToIdx", l2TxsRaw[i].ToIdx, "ToEthAddr", l2TxsRaw[i].ToEthAddr, "ToBJJ", l2TxsRaw[i].ToBJJ)
continue
}
validTxs = append(validTxs, l2TxsRaw[i])
} else {
// case: ToBJJ==0:
// if idx exist for EthAddr use it
_, err := txsel.localAccountsDB.GetIdxByEthAddr(l2TxsRaw[i].ToEthAddr)
if err == nil {
// account for ToEthAddr already exist,
// there is no need to create a new one.
// tx valid, StateDB will use the ToIdx==0 to define the AuxToIdx
validTxs = append(validTxs, l2TxsRaw[i])
continue
}
// if not, check if AccountCreationAuth exist for that ToEthAddr
accAuth, err = txsel.l2db.GetAccountCreationAuth(l2TxsRaw[i].ToEthAddr)
if err != nil {
// not found, l2Tx will not be added in the selection
log.Debugw("invalid L2Tx: ToIdx not found in StateDB, neither ToEthAddr found in AccountCreationAuths L2DB", "ToIdx", l2TxsRaw[i].ToIdx, "ToEthAddr", l2TxsRaw[i].ToEthAddr)
continue
}
validTxs = append(validTxs, l2TxsRaw[i])
}
// create L1CoordinatorTx for the accountCreation
l1CoordinatorTx := common.L1Tx{
Position: positionL1,
UserOrigin: false,
FromEthAddr: accAuth.EthAddr,
FromBJJ: accAuth.BJJ,
TokenID: l2TxsRaw[i].TokenID,
LoadAmount: big.NewInt(0),
Type: common.TxTypeCreateAccountDeposit,
}
positionL1++
l1CoordinatorTxs = append(l1CoordinatorTxs, l1CoordinatorTx)
} else if bytes.Equal(l2TxsRaw[i].ToEthAddr.Bytes(), common.FFAddr.Bytes()) && l2TxsRaw[i].ToBJJ != nil {
// if idx exist for EthAddr&BJJ use it
_, err := txsel.localAccountsDB.GetIdxByEthAddrBJJ(l2TxsRaw[i].ToEthAddr, l2TxsRaw[i].ToBJJ)
if err == nil {
// account for ToEthAddr&ToBJJ already exist, (where ToEthAddr==0xff)
// there is no need to create a new one.
// tx valid, StateDB will use the ToIdx==0 to define the AuxToIdx
validTxs = append(validTxs, l2TxsRaw[i])
continue
}
// if idx don't exist for EthAddr&BJJ,
// coordinator can create a new account without
// L1Authorization, as ToEthAddr==0xff
// create L1CoordinatorTx for the accountCreation
if l2TxsRaw[i].ToEthAddr == nil {
log.Warn("l2TxsRaw[i].ToEthAddr should not be nil")
continue
}
l1CoordinatorTx := common.L1Tx{
Position: positionL1,
UserOrigin: false,
FromEthAddr: *l2TxsRaw[i].ToEthAddr,
FromBJJ: l2TxsRaw[i].ToBJJ,
TokenID: l2TxsRaw[i].TokenID,
LoadAmount: big.NewInt(0),
Type: common.TxTypeCreateAccountDeposit,
}
positionL1++
l1CoordinatorTxs = append(l1CoordinatorTxs, l1CoordinatorTx)
}
} else if *l2TxsRaw[i].ToIdx >= common.IdxUserThreshold {
_, err = txsel.localAccountsDB.GetAccount(l2TxsRaw[i].ToIdx)
if err != nil {
// tx not valid
log.Debugw("invalid L2Tx: ToIdx not found in StateDB", "ToIdx", l2TxsRaw[i].ToIdx)
continue
}
// Account found in the DB, include the l2Tx in the selection
validTxs = append(validTxs, l2TxsRaw[i])
} else if *l2TxsRaw[i].ToIdx == common.Idx(1) { // nil already checked before
// valid txs (of Exit type)
validTxs = append(validTxs, l2TxsRaw[i])
}
}
// get most profitable L2-tx
maxL2Txs := txsel.MaxTxs - uint64(len(l1CoordinatorTxs)) // - len(l1UserTxs)
l2Txs := txsel.getL2Profitable(validTxs, maxL2Txs)
// process the txs in the local AccountsDB
_, _, err = txsel.localAccountsDB.ProcessTxs(l1Txs, l1CoordinatorTxs, l2Txs)
if err != nil {
return nil, nil, nil, err
}
err = txsel.localAccountsDB.MakeCheckpoint()
if err != nil {
return nil, nil, nil, err
}
return l1Txs, l1CoordinatorTxs, l2Txs, nil
}
func checkAlreadyPendingToCreate(l1CoordinatorTxs []common.L1Tx, addr *ethCommon.Address, bjj *babyjub.PublicKey) bool {
if addr == nil {
log.Warn("The provided addr is nil")
return false
}
for i := 0; i < len(l1CoordinatorTxs); i++ {
if bytes.Equal(l1CoordinatorTxs[i].FromEthAddr.Bytes(), addr.Bytes()) {
if bjj == nil {
return true
}
if l1CoordinatorTxs[i].FromBJJ == bjj {
return true
}
}
}
return false
}
func (txsel *TxSelector) getL2Profitable(txs txs, max uint64) txs {
sort.Sort(txs)
if len(txs) < int(max) {
return txs
}
return txs[:max]
}