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package common
import (
"encoding/binary"
"fmt"
"math/big"
ethCommon "github.com/ethereum/go-ethereum/common"
)
// Batch is a struct that represents Hermez network batch
type Batch struct {
BatchNum BatchNum `meddler:"batch_num"`
EthBlockNum uint64 `meddler:"eth_block_num"` // Ethereum block in which the batch is forged
ForgerAddr ethCommon.Address `meddler:"forger_addr"` // TODO: Should this be retrieved via slot reference?
CollectedFees map[TokenID]*big.Int `meddler:"fees_collected,json"`
StateRoot Hash `meddler:"state_root"`
NumAccounts int `meddler:"num_accounts"`
ExitRoot Hash `meddler:"exit_root"`
ForgeL1TxsNum uint32 `meddler:"forge_l1_txs_num"` // optional, Only when the batch forges L1 txs. Identifier that corresponds to the group of L1 txs forged in the current batch.
SlotNum SlotNum `meddler:"slot_num"` // Slot in which the batch is forged
}
// BatchNum identifies a batch
type BatchNum uint32
// Bytes returns a byte array of length 4 representing the BatchNum
func (bn BatchNum) Bytes() []byte {
var batchNumBytes [4]byte
binary.LittleEndian.PutUint32(batchNumBytes[:], uint32(bn))
return batchNumBytes[:]
}
// BatchNumFromBytes returns BatchNum from a []byte
func BatchNumFromBytes(b []byte) (BatchNum, error) {
if len(b) != 4 {
return 0, fmt.Errorf("can not parse BatchNumFromBytes, bytes len %d, expected 4", len(b))
}
batchNum := binary.LittleEndian.Uint32(b[:4])
return BatchNum(batchNum), nil
}