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  1. package common
  2. import (
  3. "encoding/binary"
  4. "fmt"
  5. "math/big"
  6. ethCommon "github.com/ethereum/go-ethereum/common"
  7. )
  8. const batchNumBytesLen = 8
  9. // Batch is a struct that represents Hermez network batch
  10. type Batch struct {
  11. BatchNum BatchNum `meddler:"batch_num"`
  12. EthBlockNum int64 `meddler:"eth_block_num"` // Ethereum block in which the batch is forged
  13. ForgerAddr ethCommon.Address `meddler:"forger_addr"` // TODO: Should this be retrieved via slot reference?
  14. CollectedFees map[TokenID]*big.Int `meddler:"fees_collected,json"`
  15. StateRoot Hash `meddler:"state_root"`
  16. NumAccounts int `meddler:"num_accounts"`
  17. ExitRoot Hash `meddler:"exit_root"`
  18. ForgeL1TxsNum *int64 `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.
  19. SlotNum SlotNum `meddler:"slot_num"` // Slot in which the batch is forged
  20. TotalFeesUSD *float64 `meddler:"total_fees_usd"`
  21. }
  22. // BatchNum identifies a batch
  23. type BatchNum int64
  24. // Bytes returns a byte array of length 4 representing the BatchNum
  25. func (bn BatchNum) Bytes() []byte {
  26. var batchNumBytes [batchNumBytesLen]byte
  27. binary.BigEndian.PutUint64(batchNumBytes[:], uint64(bn))
  28. return batchNumBytes[:]
  29. }
  30. // BatchNumFromBytes returns BatchNum from a []byte
  31. func BatchNumFromBytes(b []byte) (BatchNum, error) {
  32. if len(b) != batchNumBytesLen {
  33. return 0, fmt.Errorf("can not parse BatchNumFromBytes, bytes len %d, expected %d", len(b), batchNumBytesLen)
  34. }
  35. batchNum := binary.BigEndian.Uint64(b[:batchNumBytesLen])
  36. return BatchNum(batchNum), nil
  37. }