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package til
import (
"crypto/ecdsa"
"fmt"
"math/big"
"strconv"
"strings"
"time"
ethCommon "github.com/ethereum/go-ethereum/common"
ethCrypto "github.com/ethereum/go-ethereum/crypto"
"github.com/hermeznetwork/hermez-node/common"
"github.com/hermeznetwork/hermez-node/log"
"github.com/iden3/go-iden3-crypto/babyjub"
)
func newBatchData(batchNum int) common.BatchData {
return common.BatchData{
L1CoordinatorTxs: []common.L1Tx{},
L2Txs: []common.L2Tx{},
Batch: common.Batch{
BatchNum: common.BatchNum(batchNum),
StateRoot: big.NewInt(0), ExitRoot: big.NewInt(0)},
}
}
func newBlock(blockNum int64) common.BlockData {
return common.BlockData{
Block: common.Block{
EthBlockNum: blockNum,
},
Rollup: common.RollupData{
L1UserTxs: []common.L1Tx{},
},
}
}
// Context contains the data of the test
type Context struct {
Instructions []instruction
userNames []string
Users map[string]*User
LastRegisteredTokenID common.TokenID
l1CreatedAccounts map[string]*Account
// rollupConstMaxL1UserTx Maximum L1-user transactions allowed to be queued in a batch
rollupConstMaxL1UserTx int
idx int
currBlock common.BlockData
currBatch common.BatchData
currBatchNum int
Queues [][]L1Tx
ToForgeNum int
openToForge int
currBatchTest struct {
l1CoordinatorTxs []L1Tx
l2Txs []L2Tx
}
blockNum int64
}
// NewContext returns a new Context
func NewContext(rollupConstMaxL1UserTx int) *Context {
currBatchNum := 1 // The protocol defines the first batchNum to be 1
return &Context{
Users: make(map[string]*User),
l1CreatedAccounts: make(map[string]*Account),
LastRegisteredTokenID: 0,
rollupConstMaxL1UserTx: rollupConstMaxL1UserTx,
idx: common.UserThreshold,
// We use some placeholder values for StateRoot and ExitTree
// because these values will never be nil
currBlock: newBlock(2), //nolint:gomnd
currBatch: newBatchData(currBatchNum),
currBatchNum: currBatchNum,
// start with 2 queues, one for toForge, and the other for openToForge
Queues: make([][]L1Tx, 2),
ToForgeNum: 0,
openToForge: 1,
//nolint:gomnd
blockNum: 2, // rollup genesis blockNum
}
}
// Account contains the data related to the account for a specific TokenID of a User
type Account struct {
Idx common.Idx
Nonce common.Nonce
}
// User contains the data related to a testing user
type User struct {
BJJ *babyjub.PrivateKey
Addr ethCommon.Address
Accounts map[common.TokenID]*Account
}
// L1Tx is the data structure used internally for transaction test generation,
// which contains a common.L1Tx data plus some intermediate data for the
// transaction generation.
type L1Tx struct {
lineNum int
fromIdxName string
toIdxName string
L1Tx common.L1Tx
}
// L2Tx is the data structure used internally for transaction test generation,
// which contains a common.L2Tx data plus some intermediate data for the
// transaction generation.
type L2Tx struct {
lineNum int
fromIdxName string
toIdxName string
tokenID common.TokenID
L2Tx common.L2Tx
}
// GenerateBlocks returns an array of BlockData for a given set. It uses the
// users (keys & nonces) of the Context.
func (tc *Context) GenerateBlocks(set string) ([]common.BlockData, error) {
parser := newParser(strings.NewReader(set))
parsedSet, err := parser.parse()
if err != nil {
return nil, err
}
if parsedSet.typ != setTypeBlockchain {
return nil, fmt.Errorf("Expected set type: %s, found: %s", setTypeBlockchain, parsedSet.typ)
}
tc.Instructions = parsedSet.instructions
tc.userNames = parsedSet.users
tc.generateKeys(tc.userNames)
var blocks []common.BlockData
for _, inst := range parsedSet.instructions {
switch inst.typ {
case txTypeCreateAccountDepositCoordinator: // tx source: L1CoordinatorTx
if err := tc.checkIfTokenIsRegistered(inst); err != nil {
log.Error(err)
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
tx := common.L1Tx{
FromEthAddr: tc.Users[inst.from].Addr,
FromBJJ: tc.Users[inst.from].BJJ.Public(),
TokenID: inst.tokenID,
Amount: big.NewInt(0),
LoadAmount: big.NewInt(0),
Type: common.TxTypeCreateAccountDeposit, // as txTypeCreateAccountDepositCoordinator is not valid oustide Til package
}
testTx := L1Tx{
lineNum: inst.lineNum,
fromIdxName: inst.from,
L1Tx: tx,
}
tc.currBatchTest.l1CoordinatorTxs = append(tc.currBatchTest.l1CoordinatorTxs, testTx)
case common.TxTypeCreateAccountDeposit, common.TxTypeCreateAccountDepositTransfer: // tx source: L1UserTx
if err := tc.checkIfTokenIsRegistered(inst); err != nil {
log.Error(err)
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
tx := common.L1Tx{
FromEthAddr: tc.Users[inst.from].Addr,
FromBJJ: tc.Users[inst.from].BJJ.Public(),
TokenID: inst.tokenID,
Amount: big.NewInt(0),
LoadAmount: big.NewInt(int64(inst.loadAmount)),
Type: inst.typ,
}
if inst.typ == common.TxTypeCreateAccountDepositTransfer {
tx.Amount = big.NewInt(int64(inst.amount))
}
testTx := L1Tx{
lineNum: inst.lineNum,
fromIdxName: inst.from,
toIdxName: inst.to,
L1Tx: tx,
}
if err := tc.addToL1Queue(testTx); err != nil {
return nil, err
}
case common.TxTypeDeposit, common.TxTypeDepositTransfer: // tx source: L1UserTx
if err := tc.checkIfTokenIsRegistered(inst); err != nil {
log.Error(err)
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
if err := tc.checkIfAccountExists(inst.from, inst); err != nil {
log.Error(err)
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
tx := common.L1Tx{
TokenID: inst.tokenID,
Amount: big.NewInt(0),
LoadAmount: big.NewInt(int64(inst.loadAmount)),
Type: inst.typ,
}
if inst.typ == common.TxTypeDepositTransfer {
tx.Amount = big.NewInt(int64(inst.amount))
}
testTx := L1Tx{
lineNum: inst.lineNum,
fromIdxName: inst.from,
toIdxName: inst.to,
L1Tx: tx,
}
if err := tc.addToL1Queue(testTx); err != nil {
return nil, err
}
case common.TxTypeTransfer: // L2Tx
if err := tc.checkIfTokenIsRegistered(inst); err != nil {
log.Error(err)
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
tx := common.L2Tx{
Amount: big.NewInt(int64(inst.amount)),
Fee: common.FeeSelector(inst.fee),
Type: common.TxTypeTransfer,
EthBlockNum: tc.blockNum,
}
tx.BatchNum = common.BatchNum(tc.currBatchNum) // when converted to PoolL2Tx BatchNum parameter is lost
testTx := L2Tx{
lineNum: inst.lineNum,
fromIdxName: inst.from,
toIdxName: inst.to,
tokenID: inst.tokenID,
L2Tx: tx,
}
tc.currBatchTest.l2Txs = append(tc.currBatchTest.l2Txs, testTx)
case common.TxTypeForceTransfer: // tx source: L1UserTx
if err := tc.checkIfTokenIsRegistered(inst); err != nil {
log.Error(err)
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
tx := common.L1Tx{
TokenID: inst.tokenID,
Amount: big.NewInt(int64(inst.amount)),
LoadAmount: big.NewInt(0),
Type: common.TxTypeForceTransfer,
}
testTx := L1Tx{
lineNum: inst.lineNum,
fromIdxName: inst.from,
toIdxName: inst.to,
L1Tx: tx,
}
if err := tc.addToL1Queue(testTx); err != nil {
return nil, err
}
case common.TxTypeExit: // tx source: L2Tx
if err := tc.checkIfTokenIsRegistered(inst); err != nil {
log.Error(err)
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
tx := common.L2Tx{
ToIdx: common.Idx(1), // as is an Exit
Fee: common.FeeSelector(inst.fee),
Amount: big.NewInt(int64(inst.amount)),
Type: common.TxTypeExit,
EthBlockNum: tc.blockNum,
}
tx.BatchNum = common.BatchNum(tc.currBatchNum) // when converted to PoolL2Tx BatchNum parameter is lost
testTx := L2Tx{
lineNum: inst.lineNum,
fromIdxName: inst.from,
toIdxName: inst.to,
tokenID: inst.tokenID,
L2Tx: tx,
}
tc.currBatchTest.l2Txs = append(tc.currBatchTest.l2Txs, testTx)
case common.TxTypeForceExit: // tx source: L1UserTx
if err := tc.checkIfTokenIsRegistered(inst); err != nil {
log.Error(err)
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
tx := common.L1Tx{
ToIdx: common.Idx(1), // as is an Exit
TokenID: inst.tokenID,
Amount: big.NewInt(int64(inst.amount)),
LoadAmount: big.NewInt(0),
Type: common.TxTypeForceExit,
}
testTx := L1Tx{
lineNum: inst.lineNum,
fromIdxName: inst.from,
toIdxName: inst.to,
L1Tx: tx,
}
if err := tc.addToL1Queue(testTx); err != nil {
return nil, err
}
case typeNewBatch:
if err = tc.calculateIdxForL1Txs(true, tc.currBatchTest.l1CoordinatorTxs); err != nil {
return nil, err
}
if err = tc.setIdxs(); err != nil {
log.Error(err)
return nil, err
}
case typeNewBatchL1:
// for each L1UserTx of the Queues[ToForgeNum], calculate the Idx
if err = tc.calculateIdxForL1Txs(false, tc.Queues[tc.ToForgeNum]); err != nil {
return nil, err
}
if err = tc.calculateIdxForL1Txs(true, tc.currBatchTest.l1CoordinatorTxs); err != nil {
return nil, err
}
tc.currBatch.L1Batch = true
if err = tc.setIdxs(); err != nil {
log.Error(err)
return nil, err
}
toForgeL1TxsNum := int64(tc.openToForge)
tc.currBatch.Batch.ForgeL1TxsNum = &toForgeL1TxsNum
// advance batch
tc.ToForgeNum++
if tc.ToForgeNum == tc.openToForge {
tc.openToForge++
newQueue := []L1Tx{}
tc.Queues = append(tc.Queues, newQueue)
}
case typeNewBlock:
blocks = append(blocks, tc.currBlock)
tc.blockNum++
tc.currBlock = newBlock(tc.blockNum)
case typeAddToken:
newToken := common.Token{
EthAddr: ethCommon.BigToAddress(big.NewInt(int64(inst.tokenID * 100))), //nolint:gomnd
// Name: fmt.Sprintf("Token %d", inst.tokenID),
// Symbol: fmt.Sprintf("TK%d", inst.tokenID),
// Decimals: 18,
TokenID: inst.tokenID,
EthBlockNum: tc.blockNum,
}
if inst.tokenID != tc.LastRegisteredTokenID+1 {
return nil, fmt.Errorf("Line %d: AddToken TokenID should be sequential, expected TokenID: %d, defined TokenID: %d", inst.lineNum, tc.LastRegisteredTokenID+1, inst.tokenID)
}
tc.LastRegisteredTokenID++
tc.currBlock.Rollup.AddedTokens = append(tc.currBlock.Rollup.AddedTokens, newToken)
default:
return nil, fmt.Errorf("Line %d: Unexpected type: %s", inst.lineNum, inst.typ)
}
}
return blocks, nil
}
// calculateIdxsForL1Txs calculates new Idx for new created accounts. If
// 'isCoordinatorTxs==true', adds the tx to tc.currBatch.L1CoordinatorTxs.
func (tc *Context) calculateIdxForL1Txs(isCoordinatorTxs bool, txs []L1Tx) error {
// for each batch.L1CoordinatorTxs of the Queues[ToForgeNum], calculate the Idx
for i := 0; i < len(txs); i++ {
tx := txs[i]
if tx.L1Tx.Type == common.TxTypeCreateAccountDeposit || tx.L1Tx.Type == common.TxTypeCreateAccountDepositTransfer {
if tc.Users[tx.fromIdxName].Accounts[tx.L1Tx.TokenID] != nil { // if account already exists, return error
return fmt.Errorf("Can not create same account twice (same User (%s) & same TokenID (%d)) (this is a design property of Til)", tx.fromIdxName, tx.L1Tx.TokenID)
}
tc.Users[tx.fromIdxName].Accounts[tx.L1Tx.TokenID] = &Account{
Idx: common.Idx(tc.idx),
Nonce: common.Nonce(0),
}
tc.l1CreatedAccounts[idxTokenIDToString(tx.fromIdxName, tx.L1Tx.TokenID)] = tc.Users[tx.fromIdxName].Accounts[tx.L1Tx.TokenID]
tc.idx++
}
if isCoordinatorTxs {
tc.currBatch.L1CoordinatorTxs = append(tc.currBatch.L1CoordinatorTxs, tx.L1Tx)
}
}
return nil
}
// setIdxs sets the Idxs to the transactions of the tc.currBatch
func (tc *Context) setIdxs() error {
// once Idxs are calculated, update transactions to use the new Idxs
for i := 0; i < len(tc.currBatchTest.l2Txs); i++ {
testTx := &tc.currBatchTest.l2Txs[i]
if tc.Users[testTx.fromIdxName].Accounts[testTx.tokenID] == nil {
return fmt.Errorf("Line %d: %s from User %s for TokenID %d while account not created yet", testTx.lineNum, testTx.L2Tx.Type, testTx.fromIdxName, testTx.tokenID)
}
if testTx.L2Tx.Type == common.TxTypeTransfer {
if _, ok := tc.l1CreatedAccounts[idxTokenIDToString(testTx.toIdxName, testTx.tokenID)]; !ok {
return fmt.Errorf("Line %d: Can not create Transfer for a non existing account. Batch %d, ToIdx name: %s, TokenID: %d", testTx.lineNum, tc.currBatchNum, testTx.toIdxName, testTx.tokenID)
}
}
tc.Users[testTx.fromIdxName].Accounts[testTx.tokenID].Nonce++
// next line is commented to avoid Blockchain L2Txs to have
// Nonce different from 0, as from Blockchain those
// transactions will come without Nonce
// testTx.L2Tx.Nonce = tc.Users[testTx.fromIdxName].Accounts[testTx.tokenID].Nonce
// set real Idx
testTx.L2Tx.FromIdx = tc.Users[testTx.fromIdxName].Accounts[testTx.tokenID].Idx
if testTx.L2Tx.Type == common.TxTypeTransfer {
testTx.L2Tx.ToIdx = tc.Users[testTx.toIdxName].Accounts[testTx.tokenID].Idx
}
// in case Type==Exit, ToIdx=1, already set at the
// GenerateBlocks main switch inside TxTypeExit case
nTx, err := common.NewL2Tx(&testTx.L2Tx)
if err != nil {
return fmt.Errorf("Line %d: %s", testTx.lineNum, err.Error())
}
testTx.L2Tx = *nTx
tc.currBatch.L2Txs = append(tc.currBatch.L2Txs, testTx.L2Tx)
}
tc.currBatch.Batch.LastIdx = int64(tc.idx - 1) // `-1` because tc.idx is the next available idx
tc.currBlock.Rollup.Batches = append(tc.currBlock.Rollup.Batches, tc.currBatch)
tc.currBatchNum++
tc.currBatch = newBatchData(tc.currBatchNum)
tc.currBatchTest.l1CoordinatorTxs = nil
tc.currBatchTest.l2Txs = nil
return nil
}
// addToL1Queue adds the L1Tx into the queue that is open and has space
func (tc *Context) addToL1Queue(tx L1Tx) error {
if len(tc.Queues[tc.openToForge]) >= tc.rollupConstMaxL1UserTx {
// if current OpenToForge queue reached its Max, move into a
// new queue
tc.openToForge++
newQueue := []L1Tx{}
tc.Queues = append(tc.Queues, newQueue)
}
// Fill L1UserTx specific parameters
tx.L1Tx.UserOrigin = true
toForgeL1TxsNum := int64(tc.openToForge)
tx.L1Tx.ToForgeL1TxsNum = &toForgeL1TxsNum
tx.L1Tx.EthBlockNum = tc.blockNum
tx.L1Tx.Position = len(tc.Queues[tc.openToForge])
// When an L1UserTx is generated, all idxs must be available (except when idx == 0 or idx == 1)
if tx.L1Tx.Type != common.TxTypeCreateAccountDeposit && tx.L1Tx.Type != common.TxTypeCreateAccountDepositTransfer {
tx.L1Tx.FromIdx = tc.Users[tx.fromIdxName].Accounts[tx.L1Tx.TokenID].Idx
}
tx.L1Tx.FromEthAddr = tc.Users[tx.fromIdxName].Addr
tx.L1Tx.FromBJJ = tc.Users[tx.fromIdxName].BJJ.Public()
if tx.toIdxName == "" {
tx.L1Tx.ToIdx = common.Idx(0)
} else {
account, ok := tc.Users[tx.toIdxName].Accounts[tx.L1Tx.TokenID]
if !ok {
return fmt.Errorf("Line %d: Transfer to User: %s, for TokenID: %d, "+
"while account not created yet", tx.lineNum, tx.toIdxName, tx.L1Tx.TokenID)
}
tx.L1Tx.ToIdx = account.Idx
}
if tx.L1Tx.Type == common.TxTypeForceExit {
tx.L1Tx.ToIdx = common.Idx(1)
}
nTx, err := common.NewL1Tx(&tx.L1Tx)
if err != nil {
return fmt.Errorf("Line %d: %s", tx.lineNum, err.Error())
}
tx.L1Tx = *nTx
tc.Queues[tc.openToForge] = append(tc.Queues[tc.openToForge], tx)
tc.currBlock.Rollup.L1UserTxs = append(tc.currBlock.Rollup.L1UserTxs, tx.L1Tx)
return nil
}
func (tc *Context) checkIfAccountExists(tf string, inst instruction) error {
if tc.Users[tf].Accounts[inst.tokenID] == nil {
return fmt.Errorf("%s at User: %s, for TokenID: %d, while account not created yet", inst.typ, tf, inst.tokenID)
}
return nil
}
func (tc *Context) checkIfTokenIsRegistered(inst instruction) error {
if inst.tokenID > tc.LastRegisteredTokenID {
return fmt.Errorf("Can not process %s: TokenID %d not registered, last registered TokenID: %d", inst.typ, inst.tokenID, tc.LastRegisteredTokenID)
}
return nil
}
// GeneratePoolL2Txs returns an array of common.PoolL2Tx from a given set. It
// uses the users (keys) of the Context.
func (tc *Context) GeneratePoolL2Txs(set string) ([]common.PoolL2Tx, error) {
parser := newParser(strings.NewReader(set))
parsedSet, err := parser.parse()
if err != nil {
return nil, err
}
if parsedSet.typ != setTypePoolL2 {
return nil, fmt.Errorf("Expected set type: %s, found: %s", setTypePoolL2, parsedSet.typ)
}
tc.Instructions = parsedSet.instructions
tc.userNames = parsedSet.users
tc.generateKeys(tc.userNames)
txs := []common.PoolL2Tx{}
for _, inst := range tc.Instructions {
switch inst.typ {
case common.TxTypeTransfer, common.TxTypeTransferToEthAddr, common.TxTypeTransferToBJJ:
if err := tc.checkIfAccountExists(inst.from, inst); err != nil {
log.Error(err)
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
if inst.typ == common.TxTypeTransfer {
// if TxTypeTransfer, need to exist the ToIdx account
if err := tc.checkIfAccountExists(inst.to, inst); err != nil {
log.Error(err)
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
}
tc.Users[inst.from].Accounts[inst.tokenID].Nonce++
// if account of receiver does not exist, don't use
// ToIdx, and use only ToEthAddr & ToBJJ
tx := common.PoolL2Tx{
FromIdx: tc.Users[inst.from].Accounts[inst.tokenID].Idx,
TokenID: inst.tokenID,
Amount: big.NewInt(int64(inst.amount)),
Fee: common.FeeSelector(inst.fee),
Nonce: tc.Users[inst.from].Accounts[inst.tokenID].Nonce,
State: common.PoolL2TxStatePending,
Timestamp: time.Now(),
RqToEthAddr: common.EmptyAddr,
RqToBJJ: nil,
Type: inst.typ,
}
if tx.Type == common.TxTypeTransfer {
tx.ToIdx = tc.Users[inst.to].Accounts[inst.tokenID].Idx
tx.ToEthAddr = tc.Users[inst.to].Addr
tx.ToBJJ = tc.Users[inst.to].BJJ.Public()
} else if tx.Type == common.TxTypeTransferToEthAddr {
tx.ToIdx = common.Idx(0)
tx.ToEthAddr = tc.Users[inst.to].Addr
} else if tx.Type == common.TxTypeTransferToBJJ {
tx.ToIdx = common.Idx(0)
tx.ToEthAddr = common.FFAddr
tx.ToBJJ = tc.Users[inst.to].BJJ.Public()
}
nTx, err := common.NewPoolL2Tx(&tx)
if err != nil {
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
tx = *nTx
// perform signature and set it to tx.Signature
toSign, err := tx.HashToSign()
if err != nil {
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
sig := tc.Users[inst.from].BJJ.SignPoseidon(toSign)
tx.Signature = sig.Compress()
txs = append(txs, tx)
case common.TxTypeExit:
tc.Users[inst.from].Accounts[inst.tokenID].Nonce++
tx := common.PoolL2Tx{
FromIdx: tc.Users[inst.from].Accounts[inst.tokenID].Idx,
ToIdx: common.Idx(1), // as is an Exit
Fee: common.FeeSelector(inst.fee),
TokenID: inst.tokenID,
Amount: big.NewInt(int64(inst.amount)),
Nonce: tc.Users[inst.from].Accounts[inst.tokenID].Nonce,
Type: common.TxTypeExit,
}
nTx, err := common.NewPoolL2Tx(&tx)
if err != nil {
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
tx = *nTx
// perform signature and set it to tx.Signature
toSign, err := tx.HashToSign()
if err != nil {
return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error())
}
sig := tc.Users[inst.from].BJJ.SignPoseidon(toSign)
tx.Signature = sig.Compress()
txs = append(txs, tx)
default:
return nil, fmt.Errorf("Line %d: instruction type unrecognized: %s", inst.lineNum, inst.typ)
}
}
return txs, nil
}
// generateKeys generates BabyJubJub & Address keys for the given list of user
// names in a deterministic way. This means, that for the same given
// 'userNames' in a certain order, the keys will be always the same.
func (tc *Context) generateKeys(userNames []string) {
for i := 1; i < len(userNames)+1; i++ {
if _, ok := tc.Users[userNames[i-1]]; ok {
// account already created
continue
}
// babyjubjub key
var sk babyjub.PrivateKey
copy(sk[:], []byte(strconv.Itoa(i))) // only for testing
// eth address
var key ecdsa.PrivateKey
key.D = big.NewInt(int64(i)) // only for testing
key.PublicKey.X, key.PublicKey.Y = ethCrypto.S256().ScalarBaseMult(key.D.Bytes())
key.Curve = ethCrypto.S256()
addr := ethCrypto.PubkeyToAddress(key.PublicKey)
u := User{
BJJ: &sk,
Addr: addr,
Accounts: make(map[common.TokenID]*Account),
}
tc.Users[userNames[i-1]] = &u
}
}
// L1TxsToCommonL1Txs converts an array of []til.L1Tx to []common.L1Tx
func L1TxsToCommonL1Txs(l1 []L1Tx) []common.L1Tx {
var r []common.L1Tx
for i := 0; i < len(l1); i++ {
r = append(r, l1[i].L1Tx)
}
return r
}