package common import ( "fmt" "math/big" "github.com/hermeznetwork/tracerr" ) // L2Tx is a struct that represents an already forged L2 tx type L2Tx struct { // Stored in DB: mandatory fileds TxID TxID `meddler:"id"` BatchNum BatchNum `meddler:"batch_num"` // batchNum in which this tx was forged. Position int `meddler:"position"` FromIdx Idx `meddler:"from_idx"` ToIdx Idx `meddler:"to_idx"` Amount *big.Int `meddler:"amount,bigint"` Fee FeeSelector `meddler:"fee"` Nonce Nonce `meddler:"nonce"` Type TxType `meddler:"type"` EthBlockNum int64 `meddler:"eth_block_num"` // Ethereum Block Number in which this L2Tx was added to the queue } // NewL2Tx returns the given L2Tx with the TxId & Type parameters calculated // from the L2Tx values func NewL2Tx(l2Tx *L2Tx) (*L2Tx, error) { // calculate TxType var txType TxType if l2Tx.ToIdx == Idx(1) { txType = TxTypeExit } else if l2Tx.ToIdx >= IdxUserThreshold { txType = TxTypeTransfer } else { return l2Tx, tracerr.Wrap(fmt.Errorf("Can not determine type of L2Tx, invalid ToIdx value: %d", l2Tx.ToIdx)) } // if TxType!=l2Tx.TxType return error if l2Tx.Type != "" && l2Tx.Type != txType { return l2Tx, tracerr.Wrap(fmt.Errorf("L2Tx.Type: %s, should be: %s", l2Tx.Type, txType)) } l2Tx.Type = txType var txid [TxIDLen]byte txid[0] = TxIDPrefixL2Tx fromIdxBytes, err := l2Tx.FromIdx.Bytes() if err != nil { return l2Tx, tracerr.Wrap(err) } copy(txid[1:7], fromIdxBytes[:]) nonceBytes, err := l2Tx.Nonce.Bytes() if err != nil { return l2Tx, tracerr.Wrap(err) } copy(txid[7:12], nonceBytes[:]) l2Tx.TxID = TxID(txid) return l2Tx, nil } // Tx returns a *Tx from the L2Tx func (tx *L2Tx) Tx() *Tx { batchNum := new(BatchNum) *batchNum = tx.BatchNum fee := new(FeeSelector) *fee = tx.Fee nonce := new(Nonce) *nonce = tx.Nonce return &Tx{ IsL1: false, TxID: tx.TxID, Type: tx.Type, Position: tx.Position, FromIdx: tx.FromIdx, ToIdx: tx.ToIdx, Amount: tx.Amount, BatchNum: batchNum, EthBlockNum: tx.EthBlockNum, Fee: fee, Nonce: nonce, } } // PoolL2Tx returns the data structure of PoolL2Tx with the parameters of a // L2Tx filled func (tx L2Tx) PoolL2Tx() *PoolL2Tx { return &PoolL2Tx{ TxID: tx.TxID, FromIdx: tx.FromIdx, ToIdx: tx.ToIdx, Amount: tx.Amount, Fee: tx.Fee, Nonce: tx.Nonce, Type: tx.Type, } } // L2TxsToPoolL2Txs returns an array of []*PoolL2Tx from an array of []*L2Tx, // where the PoolL2Tx only have the parameters of a L2Tx filled. func L2TxsToPoolL2Txs(txs []L2Tx) []PoolL2Tx { var r []PoolL2Tx for _, tx := range txs { r = append(r, *tx.PoolL2Tx()) } return r } // BytesDataAvailability encodes a L2Tx into []byte for the Data Availability func (tx L2Tx) BytesDataAvailability(nLevels uint32) ([]byte, error) { idxLen := nLevels / 8 //nolint:gomnd b := make([]byte, ((nLevels*2)+16+8)/8) //nolint:gomnd fromIdxBytes, err := tx.FromIdx.Bytes() if err != nil { return nil, tracerr.Wrap(err) } copy(b[0:idxLen], fromIdxBytes[6-idxLen:]) // [6-idxLen:] as is BigEndian toIdxBytes, err := tx.ToIdx.Bytes() if err != nil { return nil, tracerr.Wrap(err) } copy(b[idxLen:idxLen*2], toIdxBytes[6-idxLen:]) amountFloat16, err := NewFloat16(tx.Amount) if err != nil { return nil, tracerr.Wrap(err) } copy(b[idxLen*2:idxLen*2+2], amountFloat16.Bytes()) b[idxLen*2+2] = byte(tx.Fee) return b[:], nil } // L2TxFromBytes decodes a L1Tx from []byte func L2TxFromBytes(b []byte, nLevels int) (*L2Tx, error) { idxLen := nLevels / 8 //nolint:gomnd tx := &L2Tx{} var err error var paddedFromIdxBytes [6]byte copy(paddedFromIdxBytes[6-idxLen:], b[0:idxLen]) tx.FromIdx, err = IdxFromBytes(paddedFromIdxBytes[:]) if err != nil { return nil, tracerr.Wrap(err) } var paddedToIdxBytes [6]byte copy(paddedToIdxBytes[6-idxLen:6], b[idxLen:idxLen*2]) tx.ToIdx, err = IdxFromBytes(paddedToIdxBytes[:]) if err != nil { return nil, tracerr.Wrap(err) } tx.Amount = Float16FromBytes(b[idxLen*2 : idxLen*2+2]).BigInt() tx.Fee = FeeSelector(b[idxLen*2+2]) return tx, nil }