1package common
 2
 3import (
 4	"encoding/binary"
 5	"fmt"
 6	"math/big"
 7
 8	ethCommon "github.com/ethereum/go-ethereum/common"
 9)
10
11const batchNumBytesLen = 8
12
13// Batch is a struct that represents Hermez network batch
14type Batch struct {
15	BatchNum           BatchNum             `meddler:"batch_num"`
16	EthBlockNum        int64                `meddler:"eth_block_num"` // Ethereum block in which the batch is forged
17	ForgerAddr         ethCommon.Address    `meddler:"forger_addr"`
18	CollectedFees      map[TokenID]*big.Int `meddler:"fees_collected,json"`
19	FeeIdxsCoordinator []Idx                `meddler:"fee_idxs_coordinator,json"`
20	StateRoot          *big.Int             `meddler:"state_root,bigint"`
21	NumAccounts        int                  `meddler:"num_accounts"`
22	LastIdx            int64                `meddler:"last_idx"`
23	ExitRoot           *big.Int             `meddler:"exit_root,bigint"`
24	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.
25	SlotNum            int64                `meddler:"slot_num"`         // Slot in which the batch is forged
26	TotalFeesUSD       *float64             `meddler:"total_fees_usd"`
27}
28
29// BatchNum identifies a batch
30type BatchNum int64
31
32// Bytes returns a byte array of length 4 representing the BatchNum
33func (bn BatchNum) Bytes() []byte {
34	var batchNumBytes [batchNumBytesLen]byte
35	binary.BigEndian.PutUint64(batchNumBytes[:], uint64(bn))
36	return batchNumBytes[:]
37}
38
39// BatchNumFromBytes returns BatchNum from a []byte
40func BatchNumFromBytes(b []byte) (BatchNum, error) {
41	if len(b) != batchNumBytesLen {
42		return 0, fmt.Errorf("can not parse BatchNumFromBytes, bytes len %d, expected %d", len(b), batchNumBytesLen)
43	}
44	batchNum := binary.BigEndian.Uint64(b[:batchNumBytesLen])
45	return BatchNum(batchNum), nil
46}