hermez-node/synchronizer/synchronizer.go

/*
Package synchronizer synchronizes the hermez network state by querying events
emitted by the three smart contracts: `Hermez.sol` (referred as Rollup here),
`HermezAuctionProtocol.sol` (referred as Auction here) and
`WithdrawalDelayer.sol` (referred as WDelayer here).

The main entry point for synchronization is the `Sync` function, which at most
will synchronize one ethereum block, and all the hermez events that happened in
that block.  During a `Sync` call, a reorg can be detected; in such case, uncle
blocks will be discarded, and only in a future `Sync` call correct blocks will
be synced.

The synchronization of the events in each smart contracts are done
in the methods `rollupSync`, `auctionSync` and `wdelayerSync`, which in turn
use the interface code to read each smart contract state and events found in
"github.com/hermeznetwork/hermez-node/eth".  After these three methods are
called, an object of type `common.BlockData` is built containing all the
updates and events that happened in that block, and it is inserted in the
HistoryDB in a single SQL transaction.

`rollupSync` is the method that synchronizes batches sent via the `forgeBatch`
transaction in `Hermez.sol`.  In `rollupSync`, for every batch,  the accounts
state is updated in the StateDB by processing all transactions that have been
forged in that batch.

The consistency of the stored data is guaranteed by the HistoryDB: All the
block information is inserted in a single SQL transaction at the end of the
`Sync` method, once the StateDB has been updated.  And every time the
Synchronizer starts, it continues from the last block in the HistoryDB.  The
StateDB stores updates organized by checkpoints for every batch, and each batch
is only accessed if it appears in the HistoryDB.
*/
package synchronizer

import (
	"context"
	"database/sql"
	"fmt"
	"math/big"
	"sync"
	"time"

	"github.com/ethereum/go-ethereum"
	"github.com/hermeznetwork/hermez-node/common"
	"github.com/hermeznetwork/hermez-node/db/historydb"
	"github.com/hermeznetwork/hermez-node/db/l2db"
	"github.com/hermeznetwork/hermez-node/db/statedb"
	"github.com/hermeznetwork/hermez-node/eth"
	"github.com/hermeznetwork/hermez-node/log"
	"github.com/hermeznetwork/hermez-node/txprocessor"
	"github.com/hermeznetwork/tracerr"
)

const (
	// errStrUnknownBlock is the string returned by geth when querying an
	// unknown block
	errStrUnknownBlock = "unknown block"
)

var (
	// ErrUnknownBlock is the error returned by the Synchronizer when a
	// block is queried by hash but the ethereum node doesn't find it due
	// to it being discarded from a reorg.
	ErrUnknownBlock = fmt.Errorf("unknown block")
)

// Stats of the synchronizer
type Stats struct {
	Eth struct {
		RefreshPeriod time.Duration
		Updated       time.Time
		FirstBlockNum int64
		LastBlock     common.Block
		LastBatchNum  int64
	}
	Sync struct {
		Updated   time.Time
		LastBlock common.Block
		LastBatch common.Batch
		// LastL1BatchBlock is the last ethereum block in which an
		// l1Batch was forged
		LastL1BatchBlock  int64
		LastForgeL1TxsNum int64
		Auction           struct {
			CurrentSlot common.Slot
			NextSlot    common.Slot
		}
	}
}

// Synced returns true if the Synchronizer is up to date with the last ethereum block
func (s *Stats) Synced() bool {
	return s.Eth.LastBlock.Num == s.Sync.LastBlock.Num
}

// TODO(Edu): Consider removing all the mutexes from StatsHolder, make
// Synchronizer.Stats not thread-safe, don't pass the synchronizer to the
// debugAPI, and have a copy of the Stats in the DebugAPI that the node passes
// when the Sync updates.

// StatsHolder stores stats and that allows reading and writing them
// concurrently
type StatsHolder struct {
	Stats
	rw sync.RWMutex
}

// NewStatsHolder creates a new StatsHolder
func NewStatsHolder(firstBlockNum int64, refreshPeriod time.Duration) *StatsHolder {
	stats := Stats{}
	stats.Eth.RefreshPeriod = refreshPeriod
	stats.Eth.FirstBlockNum = firstBlockNum
	stats.Sync.LastForgeL1TxsNum = -1
	return &StatsHolder{Stats: stats}
}

// UpdateCurrentNextSlot updates the auction stats
func (s *StatsHolder) UpdateCurrentNextSlot(current *common.Slot, next *common.Slot) {
	s.rw.Lock()
	s.Sync.Auction.CurrentSlot = *current
	s.Sync.Auction.NextSlot = *next
	s.rw.Unlock()
}

// UpdateSync updates the synchronizer stats
func (s *StatsHolder) UpdateSync(lastBlock *common.Block, lastBatch *common.Batch,
	lastL1BatchBlock *int64, lastForgeL1TxsNum *int64) {
	now := time.Now()
	s.rw.Lock()
	s.Sync.LastBlock = *lastBlock
	if lastBatch != nil {
		s.Sync.LastBatch = *lastBatch
	}
	if lastL1BatchBlock != nil {
		s.Sync.LastL1BatchBlock = *lastL1BatchBlock
		s.Sync.LastForgeL1TxsNum = *lastForgeL1TxsNum
	}
	s.Sync.Updated = now
	s.rw.Unlock()
}

// UpdateEth updates the ethereum stats, only if the previous stats expired
func (s *StatsHolder) UpdateEth(ethClient eth.ClientInterface) error {
	now := time.Now()
	s.rw.RLock()
	elapsed := now.Sub(s.Eth.Updated)
	s.rw.RUnlock()
	if elapsed < s.Eth.RefreshPeriod {
		return nil
	}

	lastBlock, err := ethClient.EthBlockByNumber(context.TODO(), -1)
	if err != nil {
		return tracerr.Wrap(fmt.Errorf("EthBlockByNumber: %w", err))
	}
	lastBatchNum, err := ethClient.RollupLastForgedBatch()
	if err != nil {
		return tracerr.Wrap(fmt.Errorf("RollupLastForgedBatch: %w", err))
	}
	s.rw.Lock()
	s.Eth.Updated = now
	s.Eth.LastBlock = *lastBlock
	s.Eth.LastBatchNum = lastBatchNum
	s.rw.Unlock()
	return nil
}

// CopyStats returns a copy of the inner Stats
func (s *StatsHolder) CopyStats() *Stats {
	s.rw.RLock()
	sCopy := s.Stats
	if s.Sync.Auction.CurrentSlot.BidValue != nil {
		sCopy.Sync.Auction.CurrentSlot.BidValue =
			common.CopyBigInt(s.Sync.Auction.CurrentSlot.BidValue)
	}
	if s.Sync.Auction.CurrentSlot.DefaultSlotBid != nil {
		sCopy.Sync.Auction.CurrentSlot.DefaultSlotBid =
			common.CopyBigInt(s.Sync.Auction.CurrentSlot.DefaultSlotBid)
	}
	if s.Sync.Auction.NextSlot.BidValue != nil {
		sCopy.Sync.Auction.NextSlot.BidValue =
			common.CopyBigInt(s.Sync.Auction.NextSlot.BidValue)
	}
	if s.Sync.Auction.NextSlot.DefaultSlotBid != nil {
		sCopy.Sync.Auction.NextSlot.DefaultSlotBid =
			common.CopyBigInt(s.Sync.Auction.NextSlot.DefaultSlotBid)
	}
	if s.Sync.LastBatch.StateRoot != nil {
		sCopy.Sync.LastBatch.StateRoot =
			common.CopyBigInt(s.Sync.LastBatch.StateRoot)
	}
	s.rw.RUnlock()
	return &sCopy
}

func (s *StatsHolder) blocksPerc() float64 {
	syncLastBlockNum := s.Sync.LastBlock.Num
	if s.Sync.LastBlock.Num == 0 {
		syncLastBlockNum = s.Eth.FirstBlockNum - 1
	}
	return float64(syncLastBlockNum-(s.Eth.FirstBlockNum-1)) * 100.0 /
		float64(s.Eth.LastBlock.Num-(s.Eth.FirstBlockNum-1))
}

func (s *StatsHolder) batchesPerc(batchNum common.BatchNum) float64 {
	return float64(batchNum) * 100.0 /
		float64(s.Eth.LastBatchNum)
}

// StartBlockNums sets the first block used to start tracking the smart
// contracts
type StartBlockNums struct {
	Rollup   int64
	Auction  int64
	WDelayer int64
}

// Config is the Synchronizer configuration
type Config struct {
	StatsRefreshPeriod time.Duration
	ChainID            uint16
}

// Synchronizer implements the Synchronizer type
type Synchronizer struct {
	ethClient        eth.ClientInterface
	consts           common.SCConsts
	historyDB        *historydb.HistoryDB
	l2DB             *l2db.L2DB
	stateDB          *statedb.StateDB
	cfg              Config
	initVars         common.SCVariables
	startBlockNum    int64
	vars             common.SCVariables
	stats            *StatsHolder
	resetStateFailed bool
}

// NewSynchronizer creates a new Synchronizer
func NewSynchronizer(ethClient eth.ClientInterface, historyDB *historydb.HistoryDB,
	l2DB *l2db.L2DB, stateDB *statedb.StateDB, cfg Config) (*Synchronizer, error) {
	auctionConstants, err := ethClient.AuctionConstants()
	if err != nil {
		return nil, tracerr.Wrap(fmt.Errorf("NewSynchronizer ethClient.AuctionConstants(): %w",
			err))
	}
	rollupConstants, err := ethClient.RollupConstants()
	if err != nil {
		return nil, tracerr.Wrap(fmt.Errorf("NewSynchronizer ethClient.RollupConstants(): %w",
			err))
	}
	wDelayerConstants, err := ethClient.WDelayerConstants()
	if err != nil {
		return nil, tracerr.Wrap(fmt.Errorf("NewSynchronizer ethClient.WDelayerConstants(): %w",
			err))
	}
	consts := common.SCConsts{
		Rollup:   *rollupConstants,
		Auction:  *auctionConstants,
		WDelayer: *wDelayerConstants,
	}

	initVars, startBlockNums, err := getInitialVariables(ethClient, &consts)
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	log.Infow("Synchronizer syncing from smart contract blocks",
		"rollup", startBlockNums.Rollup,
		"auction", startBlockNums.Auction,
		"wdelayer", startBlockNums.WDelayer,
	)
	// Set startBlockNum to the minimum between Auction, Rollup and
	// WDelayer StartBlockNum
	startBlockNum := startBlockNums.Auction
	if startBlockNums.Rollup < startBlockNum {
		startBlockNum = startBlockNums.Rollup
	}
	if startBlockNums.WDelayer < startBlockNum {
		startBlockNum = startBlockNums.WDelayer
	}
	stats := NewStatsHolder(startBlockNum, cfg.StatsRefreshPeriod)
	s := &Synchronizer{
		ethClient:     ethClient,
		consts:        consts,
		historyDB:     historyDB,
		l2DB:          l2DB,
		stateDB:       stateDB,
		cfg:           cfg,
		initVars:      *initVars,
		startBlockNum: startBlockNum,
		stats:         stats,
	}
	return s, s.init()
}

// StateDB returns the inner StateDB
func (s *Synchronizer) StateDB() *statedb.StateDB {
	return s.stateDB
}

// Stats returns a copy of the Synchronizer Stats.  It is safe to call Stats()
// during a Sync call
func (s *Synchronizer) Stats() *Stats {
	return s.stats.CopyStats()
}

// AuctionConstants returns the AuctionConstants read from the smart contract
func (s *Synchronizer) AuctionConstants() *common.AuctionConstants {
	return &s.consts.Auction
}

// RollupConstants returns the RollupConstants read from the smart contract
func (s *Synchronizer) RollupConstants() *common.RollupConstants {
	return &s.consts.Rollup
}

// WDelayerConstants returns the WDelayerConstants read from the smart contract
func (s *Synchronizer) WDelayerConstants() *common.WDelayerConstants {
	return &s.consts.WDelayer
}

// SCVars returns a copy of the Smart Contract Variables
func (s *Synchronizer) SCVars() *common.SCVariables {
	return &common.SCVariables{
		Rollup:   *s.vars.Rollup.Copy(),
		Auction:  *s.vars.Auction.Copy(),
		WDelayer: *s.vars.WDelayer.Copy(),
	}
}

// setSlotCoordinator queries the highest bidder of a slot in the HistoryDB to
// determine the coordinator that can bid in a slot
func (s *Synchronizer) setSlotCoordinator(slot *common.Slot) error {
	bidCoord, err := s.historyDB.GetBestBidCoordinator(slot.SlotNum)
	if err != nil && tracerr.Unwrap(err) != sql.ErrNoRows {
		return tracerr.Wrap(err)
	}
	if tracerr.Unwrap(err) == sql.ErrNoRows {
		slot.BootCoord = true
		slot.Forger = s.vars.Auction.BootCoordinator
		slot.URL = s.vars.Auction.BootCoordinatorURL
	} else if err == nil {
		slot.BidValue = bidCoord.BidValue
		slot.DefaultSlotBid = bidCoord.DefaultSlotSetBid[slot.SlotNum%6]
		// Only if the highest bid value is greater/equal than
		// the default slot bid, the bidder is the winner of
		// the slot.  Otherwise the boot coordinator is the
		// winner.
		if slot.BidValue.Cmp(slot.DefaultSlotBid) >= 0 {
			slot.Bidder = bidCoord.Bidder
			slot.Forger = bidCoord.Forger
			slot.URL = bidCoord.URL
		} else {
			slot.BootCoord = true
			slot.Forger = s.vars.Auction.BootCoordinator
			slot.URL = s.vars.Auction.BootCoordinatorURL
		}
	}
	return nil
}

// updateCurrentSlot updates the slot with information of the current slot.
// The information about which coordinator is allowed to forge is only updated
// when we are Synced.
// hasBatch is true when the last synced block contained at least one batch.
func (s *Synchronizer) updateCurrentSlot(slot *common.Slot, reset bool, hasBatch bool) error {
	// We want the next block because the current one is already mined
	blockNum := s.stats.Sync.LastBlock.Num + 1
	slotNum := s.consts.Auction.SlotNum(blockNum)
	syncLastBlockNum := s.stats.Sync.LastBlock.Num
	if reset {
		// Using this query only to know if there
		dbFirstBatchBlockNum, err := s.historyDB.GetFirstBatchBlockNumBySlot(slotNum)
		if err != nil && tracerr.Unwrap(err) != sql.ErrNoRows {
			return tracerr.Wrap(fmt.Errorf("historyDB.GetFirstBatchBySlot: %w", err))
		} else if tracerr.Unwrap(err) == sql.ErrNoRows {
			hasBatch = false
		} else {
			hasBatch = true
			syncLastBlockNum = dbFirstBatchBlockNum
		}
		slot.ForgerCommitment = false
	} else if slotNum > slot.SlotNum {
		// We are in a new slotNum, start from default values
		slot.ForgerCommitment = false
	}
	slot.SlotNum = slotNum
	slot.StartBlock, slot.EndBlock = s.consts.Auction.SlotBlocks(slot.SlotNum)
	if hasBatch && s.consts.Auction.RelativeBlock(syncLastBlockNum) < int64(s.vars.Auction.SlotDeadline) {
		slot.ForgerCommitment = true
	}
	// If Synced, update the current coordinator
	if s.stats.Synced() && blockNum >= s.consts.Auction.GenesisBlockNum {
		if err := s.setSlotCoordinator(slot); err != nil {
			return tracerr.Wrap(err)
		}

		// TODO: Remove this SANITY CHECK once this code is tested enough
		// BEGIN SANITY CHECK
		canForge, err := s.ethClient.AuctionCanForge(slot.Forger, blockNum)
		if err != nil {
			return tracerr.Wrap(fmt.Errorf("AuctionCanForge: %w", err))
		}
		if !canForge {
			return tracerr.Wrap(fmt.Errorf("Synchronized value of forger address for closed slot "+
				"differs from smart contract: %+v", slot))
		}
		// END SANITY CHECK
	}
	return nil
}

// updateNextSlot updates the slot with information of the next slot.
// The information about which coordinator is allowed to forge is only updated
// when we are Synced.
func (s *Synchronizer) updateNextSlot(slot *common.Slot) error {
	// We want the next block because the current one is already mined
	blockNum := s.stats.Sync.LastBlock.Num + 1
	slotNum := s.consts.Auction.SlotNum(blockNum) + 1
	slot.SlotNum = slotNum
	slot.ForgerCommitment = false
	slot.StartBlock, slot.EndBlock = s.consts.Auction.SlotBlocks(slot.SlotNum)
	// If Synced, update the current coordinator
	if s.stats.Synced() && blockNum >= s.consts.Auction.GenesisBlockNum {
		if err := s.setSlotCoordinator(slot); err != nil {
			return tracerr.Wrap(err)
		}

		// TODO: Remove this SANITY CHECK once this code is tested enough
		// BEGIN SANITY CHECK
		canForge, err := s.ethClient.AuctionCanForge(slot.Forger, slot.StartBlock)
		if err != nil {
			return tracerr.Wrap(fmt.Errorf("AuctionCanForge: %w", err))
		}
		if !canForge {
			return tracerr.Wrap(fmt.Errorf("Synchronized value of forger address for closed slot "+
				"differs from smart contract: %+v", slot))
		}
		// END SANITY CHECK
	}
	return nil
}

// updateCurrentNextSlotIfSync updates the current and next slot.  Information
// about forger address that is allowed to forge is only updated if we are
// Synced.
func (s *Synchronizer) updateCurrentNextSlotIfSync(reset bool, hasBatch bool) error {
	current := s.stats.Sync.Auction.CurrentSlot
	next := s.stats.Sync.Auction.NextSlot
	if err := s.updateCurrentSlot(&current, reset, hasBatch); err != nil {
		return tracerr.Wrap(err)
	}
	if err := s.updateNextSlot(&next); err != nil {
		return tracerr.Wrap(err)
	}
	s.stats.UpdateCurrentNextSlot(&current, &next)
	return nil
}

func (s *Synchronizer) init() error {
	// Update stats parameters so that they have valid values before the
	// first Sync call
	if err := s.stats.UpdateEth(s.ethClient); err != nil {
		return tracerr.Wrap(err)
	}
	lastBlock := &common.Block{}
	lastSavedBlock, err := s.historyDB.GetLastBlock()
	// `s.historyDB.GetLastBlock()` will never return `sql.ErrNoRows`
	// because we always have the default block 0 in the DB
	if err != nil {
		return tracerr.Wrap(err)
	}
	// If we only have the default block 0,
	// make sure that the stateDB is clean
	if lastSavedBlock.Num == 0 {
		if err := s.stateDB.Reset(0); err != nil {
			return tracerr.Wrap(err)
		}
	} else {
		lastBlock = lastSavedBlock
	}
	if err := s.resetState(lastBlock); err != nil {
		s.resetStateFailed = true
		return tracerr.Wrap(err)
	}
	s.resetStateFailed = false

	log.Infow("Sync init block",
		"syncLastBlock", s.stats.Sync.LastBlock,
		"syncBlocksPerc", s.stats.blocksPerc(),
		"ethFirstBlockNum", s.stats.Eth.FirstBlockNum,
		"ethLastBlock", s.stats.Eth.LastBlock,
	)
	log.Infow("Sync init batch",
		"syncLastBatch", s.stats.Sync.LastBatch.BatchNum,
		"syncBatchesPerc", s.stats.batchesPerc(s.stats.Sync.LastBatch.BatchNum),
		"ethLastBatch", s.stats.Eth.LastBatchNum,
	)
	return nil
}

func (s *Synchronizer) resetIntermediateState() error {
	lastBlock, err := s.historyDB.GetLastBlock()
	if tracerr.Unwrap(err) == sql.ErrNoRows {
		lastBlock = &common.Block{}
	} else if err != nil {
		return tracerr.Wrap(fmt.Errorf("historyDB.GetLastBlock: %w", err))
	}
	if err := s.resetState(lastBlock); err != nil {
		s.resetStateFailed = true
		return tracerr.Wrap(fmt.Errorf("resetState at block %v: %w", lastBlock.Num, err))
	}
	s.resetStateFailed = false
	return nil
}

// Sync attempts to synchronize an ethereum block starting from lastSavedBlock.
// If lastSavedBlock is nil, the lastSavedBlock value is obtained from de DB.
// If a block is synced, it will be returned and also stored in the DB.  If a
// reorg is detected, the number of discarded blocks will be returned and no
// synchronization will be made.
// TODO: Be smart about locking: only lock during the read/write operations
func (s *Synchronizer) Sync(ctx context.Context,
	lastSavedBlock *common.Block) (blockData *common.BlockData, discarded *int64, err error) {
	if s.resetStateFailed {
		if err := s.resetIntermediateState(); err != nil {
			return nil, nil, tracerr.Wrap(err)
		}
	}

	var nextBlockNum int64 // next block number to sync
	if lastSavedBlock == nil {
		// Get lastSavedBlock from History DB
		lastSavedBlock, err = s.historyDB.GetLastBlock()
		if err != nil && tracerr.Unwrap(err) != sql.ErrNoRows {
			return nil, nil, tracerr.Wrap(err)
		}
		// If we don't have any stored block, we must do a full sync
		// starting from the startBlockNum
		if tracerr.Unwrap(err) == sql.ErrNoRows || lastSavedBlock.Num == 0 {
			nextBlockNum = s.startBlockNum
			lastSavedBlock = nil
		}
	}
	if lastSavedBlock != nil {
		nextBlockNum = lastSavedBlock.Num + 1
		if lastSavedBlock.Num < s.startBlockNum {
			return nil, nil, tracerr.Wrap(
				fmt.Errorf("lastSavedBlock (%v) < startBlockNum (%v)",
					lastSavedBlock.Num, s.startBlockNum))
		}
	}

	ethBlock, err := s.ethClient.EthBlockByNumber(ctx, nextBlockNum)
	if tracerr.Unwrap(err) == ethereum.NotFound {
		return nil, nil, nil
	} else if err != nil {
		return nil, nil, tracerr.Wrap(fmt.Errorf("EthBlockByNumber: %w", err))
	}
	log.Debugf("ethBlock: num: %v, parent: %v, hash: %v",
		ethBlock.Num, ethBlock.ParentHash.String(), ethBlock.Hash.String())

	if err := s.stats.UpdateEth(s.ethClient); err != nil {
		return nil, nil, tracerr.Wrap(err)
	}

	log.Debugw("Syncing...",
		"block", nextBlockNum,
		"ethLastBlock", s.stats.Eth.LastBlock,
	)

	// Check that the obtained ethBlock.ParentHash == prevEthBlock.Hash; if not, reorg!
	if lastSavedBlock != nil {
		if lastSavedBlock.Hash != ethBlock.ParentHash {
			// Reorg detected
			log.Debugw("Reorg Detected",
				"blockNum", ethBlock.Num,
				"block.parent(got)", ethBlock.ParentHash, "parent.hash(exp)", lastSavedBlock.Hash)
			lastDBBlockNum, err := s.reorg(lastSavedBlock)
			if err != nil {
				return nil, nil, tracerr.Wrap(err)
			}
			discarded := lastSavedBlock.Num - lastDBBlockNum
			return nil, &discarded, nil
		}
	}

	defer func() {
		// If there was an error during sync, reset to the last block
		// in the historyDB because the historyDB is written last in
		// the Sync method and is the source of consistency.  This
		// allows resetting the stateDB in the case a batch was
		// processed but the historyDB block was not committed due to an
		// error.
		if err != nil {
			if err2 := s.resetIntermediateState(); err2 != nil {
				log.Errorw("sync revert", "err", err2)
			}
		}
	}()

	// Get data from the rollup contract
	rollupData, err := s.rollupSync(ethBlock)
	if err != nil {
		return nil, nil, tracerr.Wrap(err)
	}

	// Get data from the auction contract
	auctionData, err := s.auctionSync(ethBlock)
	if err != nil {
		return nil, nil, tracerr.Wrap(err)
	}

	// Get data from the WithdrawalDelayer contract
	wDelayerData, err := s.wdelayerSync(ethBlock)
	if err != nil {
		return nil, nil, tracerr.Wrap(err)
	}

	for i := range rollupData.Withdrawals {
		withdrawal := &rollupData.Withdrawals[i]
		if !withdrawal.InstantWithdraw {
			wDelayerTransfers := wDelayerData.DepositsByTxHash[withdrawal.TxHash]
			if len(wDelayerTransfers) == 0 {
				return nil, nil, tracerr.Wrap(fmt.Errorf("WDelayer deposit corresponding to " +
					"non-instant rollup withdrawal not found"))
			}
			// Pop the first wDelayerTransfer to consume them in chronological order
			wDelayerTransfer := wDelayerTransfers[0]
			wDelayerData.DepositsByTxHash[withdrawal.TxHash] =
				wDelayerData.DepositsByTxHash[withdrawal.TxHash][1:]

			withdrawal.Owner = wDelayerTransfer.Owner
			withdrawal.Token = wDelayerTransfer.Token
		}
	}

	// Group all the block data into the structs to save into HistoryDB
	blockData = &common.BlockData{
		Block:    *ethBlock,
		Rollup:   *rollupData,
		Auction:  *auctionData,
		WDelayer: *wDelayerData,
	}

	err = s.historyDB.AddBlockSCData(blockData)
	if err != nil {
		return nil, nil, tracerr.Wrap(err)
	}

	batchesLen := len(rollupData.Batches)
	if batchesLen == 0 {
		s.stats.UpdateSync(ethBlock, nil, nil, nil)
	} else {
		var lastL1BatchBlock *int64
		var lastForgeL1TxsNum *int64
		for _, batchData := range rollupData.Batches {
			if batchData.L1Batch {
				lastL1BatchBlock = &batchData.Batch.EthBlockNum
				lastForgeL1TxsNum = batchData.Batch.ForgeL1TxsNum
			}
		}
		s.stats.UpdateSync(ethBlock,
			&rollupData.Batches[batchesLen-1].Batch,
			lastL1BatchBlock, lastForgeL1TxsNum)
	}
	hasBatch := false
	if len(rollupData.Batches) > 0 {
		hasBatch = true
	}
	if err = s.updateCurrentNextSlotIfSync(false, hasBatch); err != nil {
		return nil, nil, tracerr.Wrap(err)
	}

	for _, batchData := range rollupData.Batches {
		metricSyncedLastBatchNum.Set(float64(batchData.Batch.BatchNum))
		metricEthLastBatchNum.Set(float64(s.stats.Eth.LastBatchNum))
		log.Debugw("Synced batch",
			"syncLastBatch", batchData.Batch.BatchNum,
			"syncBatchesPerc", s.stats.batchesPerc(batchData.Batch.BatchNum),
			"ethLastBatch", s.stats.Eth.LastBatchNum,
		)
	}
	metricSyncedLastBlockNum.Set(float64(s.stats.Sync.LastBlock.Num))
	metricEthLastBlockNum.Set(float64(s.stats.Eth.LastBlock.Num))
	log.Debugw("Synced block",
		"syncLastBlockNum", s.stats.Sync.LastBlock.Num,
		"syncBlocksPerc", s.stats.blocksPerc(),
		"ethLastBlockNum", s.stats.Eth.LastBlock.Num,
	)

	return blockData, nil, nil
}

// reorg manages a reorg, updating History and State DB as needed.  Keeps
// checking previous blocks from the HistoryDB against the blockchain until a
// block hash match is found.  All future blocks in the HistoryDB and
// corresponding batches in StateBD are discarded.  Returns the last valid
// blockNum from the HistoryDB.
func (s *Synchronizer) reorg(uncleBlock *common.Block) (int64, error) {
	blockNum := uncleBlock.Num

	var block *common.Block
	for blockNum >= s.startBlockNum {
		ethBlock, err := s.ethClient.EthBlockByNumber(context.Background(), blockNum)
		if err != nil {
			return 0, tracerr.Wrap(fmt.Errorf("ethClient.EthBlockByNumber: %w", err))
		}

		block, err = s.historyDB.GetBlock(blockNum)
		if err != nil {
			return 0, tracerr.Wrap(fmt.Errorf("historyDB.GetBlock: %w", err))
		}
		if block.Hash == ethBlock.Hash {
			log.Debugf("Found valid block: %v", blockNum)
			break
		}
		blockNum--
	}
	total := uncleBlock.Num - block.Num
	log.Debugw("Discarding blocks", "total", total, "from", uncleBlock.Num, "to", block.Num+1)

	// Set History DB and State DB to the correct state
	if err := s.historyDB.Reorg(block.Num); err != nil {
		return 0, tracerr.Wrap(err)
	}

	if err := s.resetState(block); err != nil {
		s.resetStateFailed = true
		return 0, tracerr.Wrap(err)
	}
	s.resetStateFailed = false

	return block.Num, nil
}

func getInitialVariables(ethClient eth.ClientInterface,
	consts *common.SCConsts) (*common.SCVariables, *StartBlockNums, error) {
	rollupInit, rollupInitBlock, err := ethClient.RollupEventInit(consts.Auction.GenesisBlockNum)
	if err != nil {
		return nil, nil, tracerr.Wrap(fmt.Errorf("RollupEventInit: %w", err))
	}
	auctionInit, auctionInitBlock, err := ethClient.AuctionEventInit(consts.Auction.GenesisBlockNum)
	if err != nil {
		return nil, nil, tracerr.Wrap(fmt.Errorf("AuctionEventInit: %w", err))
	}
	wDelayerInit, wDelayerInitBlock, err := ethClient.WDelayerEventInit(consts.Auction.GenesisBlockNum)
	if err != nil {
		return nil, nil, tracerr.Wrap(fmt.Errorf("WDelayerEventInit: %w", err))
	}
	rollupVars := rollupInit.RollupVariables()
	auctionVars := auctionInit.AuctionVariables(consts.Auction.InitialMinimalBidding)
	wDelayerVars := wDelayerInit.WDelayerVariables()
	return &common.SCVariables{
			Rollup:   *rollupVars,
			Auction:  *auctionVars,
			WDelayer: *wDelayerVars,
		}, &StartBlockNums{
			Rollup:   rollupInitBlock,
			Auction:  auctionInitBlock,
			WDelayer: wDelayerInitBlock,
		}, nil
}

func (s *Synchronizer) resetState(block *common.Block) error {
	rollup, auction, wDelayer, err := s.historyDB.GetSCVars()
	// If SCVars are not in the HistoryDB, this is probably the first run
	// of the Synchronizer: store the initial vars taken from config
	if tracerr.Unwrap(err) == sql.ErrNoRows {
		vars := s.initVars
		log.Info("Setting initial SCVars in HistoryDB")
		if err = s.historyDB.SetInitialSCVars(&vars.Rollup, &vars.Auction, &vars.WDelayer); err != nil {
			return tracerr.Wrap(fmt.Errorf("historyDB.SetInitialSCVars: %w", err))
		}
		s.vars.Rollup = *vars.Rollup.Copy()
		s.vars.Auction = *vars.Auction.Copy()
		s.vars.WDelayer = *vars.WDelayer.Copy()
		// Add initial boot coordinator to HistoryDB
		if err := s.historyDB.AddCoordinators([]common.Coordinator{{
			Forger:      s.initVars.Auction.BootCoordinator,
			URL:         s.initVars.Auction.BootCoordinatorURL,
			EthBlockNum: s.initVars.Auction.EthBlockNum,
		}}); err != nil {
			return tracerr.Wrap(err)
		}
	} else if err != nil {
		return tracerr.Wrap(err)
	} else {
		s.vars.Rollup = *rollup
		s.vars.Auction = *auction
		s.vars.WDelayer = *wDelayer
	}

	batch, err := s.historyDB.GetLastBatch()
	if err != nil && tracerr.Unwrap(err) != sql.ErrNoRows {
		return tracerr.Wrap(fmt.Errorf("historyDB.GetLastBatchNum: %w", err))
	}
	if tracerr.Unwrap(err) == sql.ErrNoRows {
		batch = &common.Batch{}
	}

	err = s.stateDB.Reset(batch.BatchNum)
	if err != nil {
		return tracerr.Wrap(fmt.Errorf("stateDB.Reset: %w", err))
	}

	lastL1BatchBlockNum, err := s.historyDB.GetLastL1BatchBlockNum()
	if err != nil && tracerr.Unwrap(err) != sql.ErrNoRows {
		return tracerr.Wrap(fmt.Errorf("historyDB.GetLastL1BatchBlockNum: %w", err))
	}
	if tracerr.Unwrap(err) == sql.ErrNoRows {
		lastL1BatchBlockNum = 0
	}

	lastForgeL1TxsNum, err := s.historyDB.GetLastL1TxsNum()
	if err != nil && tracerr.Unwrap(err) != sql.ErrNoRows {
		return tracerr.Wrap(fmt.Errorf("historyDB.GetLastL1BatchBlockNum: %w", err))
	}
	if tracerr.Unwrap(err) == sql.ErrNoRows || lastForgeL1TxsNum == nil {
		n := int64(-1)
		lastForgeL1TxsNum = &n
	}

	s.stats.UpdateSync(block, batch, &lastL1BatchBlockNum, lastForgeL1TxsNum)

	if err := s.updateCurrentNextSlotIfSync(true, false); err != nil {
		return tracerr.Wrap(err)
	}
	return nil
}

// rollupSync retrieves all the Rollup Smart Contract Data that happened at
// ethBlock.blockNum with ethBlock.Hash.
func (s *Synchronizer) rollupSync(ethBlock *common.Block) (*common.RollupData, error) {
	blockNum := ethBlock.Num
	var rollupData = common.NewRollupData()
	// var forgeL1TxsNum int64

	// Get rollup events in the block, and make sure the block hash matches
	// the expected one.
	rollupEvents, err := s.ethClient.RollupEventsByBlock(blockNum, &ethBlock.Hash)
	if err != nil && err.Error() == errStrUnknownBlock {
		return nil, tracerr.Wrap(ErrUnknownBlock)
	} else if err != nil {
		return nil, tracerr.Wrap(fmt.Errorf("RollupEventsByBlock: %w", err))
	}
	// No events in this block
	if rollupEvents == nil {
		return &rollupData, nil
	}

	var nextForgeL1TxsNum int64 // forgeL1TxsNum for the next L1Batch
	nextForgeL1TxsNumPtr, err := s.historyDB.GetLastL1TxsNum()
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	if nextForgeL1TxsNumPtr != nil {
		nextForgeL1TxsNum = *nextForgeL1TxsNumPtr + 1
	} else {
		nextForgeL1TxsNum = 0
	}

	// Get L1UserTX
	rollupData.L1UserTxs, err = getL1UserTx(rollupEvents.L1UserTx, blockNum)
	if err != nil {
		return nil, tracerr.Wrap(err)
	}

	// Get ForgeBatch events to get the L1CoordinatorTxs
	for _, evtForgeBatch := range rollupEvents.ForgeBatch {
		batchData := common.NewBatchData()
		position := 0

		// Get the input for each Tx
		forgeBatchArgs, sender, err := s.ethClient.RollupForgeBatchArgs(evtForgeBatch.EthTxHash,
			evtForgeBatch.L1UserTxsLen)
		if err != nil {
			return nil, tracerr.Wrap(fmt.Errorf("RollupForgeBatchArgs: %w", err))
		}

		batchNum := common.BatchNum(evtForgeBatch.BatchNum)
		var l1UserTxs []common.L1Tx
		// Check if this is a L1Batch to get L1 Tx from it
		if forgeBatchArgs.L1Batch {
			// Get L1UserTxs with toForgeL1TxsNum, which correspond
			// to the L1UserTxs that are forged in this batch, so
			// that stateDB can process them.

			// First try to find them in HistoryDB.
			l1UserTxs, err = s.historyDB.GetUnforgedL1UserTxs(nextForgeL1TxsNum)
			if err != nil {
				return nil, tracerr.Wrap(err)
			}
			// Apart from the DB, try to find them in this block.
			// This could happen because in a block there could be
			// multiple batches with L1Batch = true (although it's
			// a very rare case).  If not found in the DB and the
			// block doesn't contain the l1UserTxs, it means that
			// the L1UserTxs queue with toForgeL1TxsNum was closed
			// empty, so we leave `l1UserTxs` as an empty slice.
			for _, l1UserTx := range rollupData.L1UserTxs {
				if *l1UserTx.ToForgeL1TxsNum == nextForgeL1TxsNum {
					l1UserTxs = append(l1UserTxs, l1UserTx)
				}
			}

			position = len(l1UserTxs)
		}

		l1TxsAuth := make([]common.AccountCreationAuth,
			0, len(forgeBatchArgs.L1CoordinatorTxsAuths))
		// Get L1 Coordinator Txs
		for i := range forgeBatchArgs.L1CoordinatorTxs {
			l1CoordinatorTx := forgeBatchArgs.L1CoordinatorTxs[i]
			l1CoordinatorTx.Position = position
			// l1CoordinatorTx.ToForgeL1TxsNum = &forgeL1TxsNum
			l1CoordinatorTx.UserOrigin = false
			l1CoordinatorTx.EthBlockNum = blockNum
			l1CoordinatorTx.BatchNum = &batchNum
			l1Tx, err := common.NewL1Tx(&l1CoordinatorTx)
			if err != nil {
				return nil, tracerr.Wrap(err)
			}

			batchData.L1CoordinatorTxs = append(batchData.L1CoordinatorTxs, *l1Tx)
			position++

			// Create a slice of account creation auth to be
			// inserted later if not exists
			if l1CoordinatorTx.FromEthAddr != common.RollupConstEthAddressInternalOnly {
				l1CoordinatorTxAuth := forgeBatchArgs.L1CoordinatorTxsAuths[i]
				l1TxsAuth = append(l1TxsAuth, common.AccountCreationAuth{
					EthAddr:   l1CoordinatorTx.FromEthAddr,
					BJJ:       l1CoordinatorTx.FromBJJ,
					Signature: l1CoordinatorTxAuth,
				})
			}

			// fmt.Println("DGB l1coordtx")
		}

		// Insert the slice of account creation auth
		// only if the node run as a coordinator
		if s.l2DB != nil && len(l1TxsAuth) > 0 {
			err = s.l2DB.AddManyAccountCreationAuth(l1TxsAuth)
			if err != nil {
				return nil, tracerr.Wrap(err)
			}
		}

		// Insert all the txs forged in this batch (l1UserTxs,
		// L1CoordinatorTxs, PoolL2Txs) into stateDB so that they are
		// processed.

		// Set TxType to the forged L2Txs
		for i := range forgeBatchArgs.L2TxsData {
			if err := forgeBatchArgs.L2TxsData[i].SetType(); err != nil {
				return nil, tracerr.Wrap(err)
			}
		}

		// Transform L2 txs to PoolL2Txs
		// NOTE: This is a big ugly, find a better way
		poolL2Txs := common.L2TxsToPoolL2Txs(forgeBatchArgs.L2TxsData)

		if int(forgeBatchArgs.VerifierIdx) >= len(s.consts.Rollup.Verifiers) {
			return nil, tracerr.Wrap(fmt.Errorf("forgeBatchArgs.VerifierIdx (%v) >= "+
				" len(s.consts.Rollup.Verifiers) (%v)",
				forgeBatchArgs.VerifierIdx, len(s.consts.Rollup.Verifiers)))
		}
		tpc := txprocessor.Config{
			NLevels:  uint32(s.consts.Rollup.Verifiers[forgeBatchArgs.VerifierIdx].NLevels),
			MaxTx:    uint32(s.consts.Rollup.Verifiers[forgeBatchArgs.VerifierIdx].MaxTx),
			ChainID:  s.cfg.ChainID,
			MaxFeeTx: common.RollupConstMaxFeeIdxCoordinator,
			MaxL1Tx:  common.RollupConstMaxL1Tx,
		}
		tp := txprocessor.NewTxProcessor(s.stateDB, tpc)

		// ProcessTxs updates poolL2Txs adding: Nonce (and also TokenID, but we don't use it).
		processTxsOut, err := tp.ProcessTxs(forgeBatchArgs.FeeIdxCoordinator,
			l1UserTxs, batchData.L1CoordinatorTxs, poolL2Txs)
		if err != nil {
			return nil, tracerr.Wrap(err)
		}
		if s.stateDB.CurrentBatch() != batchNum {
			return nil, tracerr.Wrap(fmt.Errorf("stateDB.BatchNum (%v) != "+
				"evtForgeBatch.BatchNum = (%v)",
				s.stateDB.CurrentBatch(), batchNum))
		}
		if s.stateDB.MT.Root().BigInt().Cmp(forgeBatchArgs.NewStRoot) != 0 {
			return nil, tracerr.Wrap(fmt.Errorf("stateDB.MTRoot (%v) != "+
				"forgeBatchArgs.NewStRoot (%v)",
				s.stateDB.MT.Root().BigInt(), forgeBatchArgs.NewStRoot))
		}

		// Transform processed PoolL2 txs to L2 and store in BatchData
		l2Txs, err := common.PoolL2TxsToL2Txs(poolL2Txs) // NOTE: This is a big uggly, find a better way
		if err != nil {
			return nil, tracerr.Wrap(err)
		}

		// Set TxID, BlockNum, BatchNum and Position to the forged L2Txs
		for i := range l2Txs {
			if err := l2Txs[i].SetID(); err != nil {
				return nil, tracerr.Wrap(err)
			}
			l2Txs[i].EthBlockNum = blockNum
			l2Txs[i].BatchNum = batchNum
			l2Txs[i].Position = position
			position++
		}
		batchData.L2Txs = l2Txs

		// Set the BatchNum in the forged L1UserTxs
		for i := range l1UserTxs {
			l1UserTxs[i].BatchNum = &batchNum
		}
		batchData.L1UserTxs = l1UserTxs

		// Set batchNum in exits
		for i := range processTxsOut.ExitInfos {
			exit := &processTxsOut.ExitInfos[i]
			exit.BatchNum = batchNum
		}
		batchData.ExitTree = processTxsOut.ExitInfos

		for i := range processTxsOut.CreatedAccounts {
			createdAccount := &processTxsOut.CreatedAccounts[i]
			createdAccount.Nonce = 0
			createdAccount.Balance = big.NewInt(0)
			createdAccount.BatchNum = batchNum
		}
		batchData.CreatedAccounts = processTxsOut.CreatedAccounts

		batchData.UpdatedAccounts = make([]common.AccountUpdate, 0,
			len(processTxsOut.UpdatedAccounts))
		for _, acc := range processTxsOut.UpdatedAccounts {
			batchData.UpdatedAccounts = append(batchData.UpdatedAccounts,
				common.AccountUpdate{
					EthBlockNum: blockNum,
					BatchNum:    batchNum,
					Idx:         acc.Idx,
					Nonce:       acc.Nonce,
					Balance:     acc.Balance,
				})
		}

		slotNum := int64(0)
		if ethBlock.Num >= s.consts.Auction.GenesisBlockNum {
			slotNum = (ethBlock.Num - s.consts.Auction.GenesisBlockNum) /
				int64(s.consts.Auction.BlocksPerSlot)
		}

		// Get Batch information
		batch := common.Batch{
			BatchNum:           batchNum,
			EthBlockNum:        blockNum,
			ForgerAddr:         *sender,
			CollectedFees:      processTxsOut.CollectedFees,
			FeeIdxsCoordinator: forgeBatchArgs.FeeIdxCoordinator,
			StateRoot:          forgeBatchArgs.NewStRoot,
			NumAccounts:        len(batchData.CreatedAccounts),
			LastIdx:            forgeBatchArgs.NewLastIdx,
			ExitRoot:           forgeBatchArgs.NewExitRoot,
			SlotNum:            slotNum,
		}
		nextForgeL1TxsNumCpy := nextForgeL1TxsNum
		if forgeBatchArgs.L1Batch {
			batch.ForgeL1TxsNum = &nextForgeL1TxsNumCpy
			batchData.L1Batch = true
			nextForgeL1TxsNum++
		}
		batchData.Batch = batch
		rollupData.Batches = append(rollupData.Batches, *batchData)
	}

	// Get Registered Tokens
	for _, evtAddToken := range rollupEvents.AddToken {
		var token common.Token

		token.TokenID = common.TokenID(evtAddToken.TokenID)
		token.EthAddr = evtAddToken.TokenAddress
		token.EthBlockNum = blockNum

		if consts, err := s.ethClient.EthERC20Consts(evtAddToken.TokenAddress); err != nil {
			log.Warnw("Error retreiving ERC20 token constants", "addr", evtAddToken.TokenAddress)
			token.Name = "ERC20_ETH_ERROR"
			token.Symbol = "ERROR"
			token.Decimals = 1
		} else {
			token.Name = cutStringMax(consts.Name, 20)
			token.Symbol = cutStringMax(consts.Symbol, 10)
			token.Decimals = consts.Decimals
		}

		rollupData.AddedTokens = append(rollupData.AddedTokens, token)
	}

	for _, evt := range rollupEvents.UpdateBucketWithdraw {
		rollupData.UpdateBucketWithdraw = append(rollupData.UpdateBucketWithdraw,
			common.BucketUpdate{
				EthBlockNum: blockNum,
				NumBucket:   evt.NumBucket,
				BlockStamp:  evt.BlockStamp,
				Withdrawals: evt.Withdrawals,
			})
	}

	for _, evt := range rollupEvents.Withdraw {
		rollupData.Withdrawals = append(rollupData.Withdrawals, common.WithdrawInfo{
			Idx:             common.Idx(evt.Idx),
			NumExitRoot:     common.BatchNum(evt.NumExitRoot),
			InstantWithdraw: evt.InstantWithdraw,
			TxHash:          evt.TxHash,
		})
	}

	for _, evt := range rollupEvents.UpdateTokenExchange {
		if len(evt.AddressArray) != len(evt.ValueArray) {
			return nil, tracerr.Wrap(fmt.Errorf("in RollupEventUpdateTokenExchange "+
				"len(AddressArray) != len(ValueArray) (%v != %v)",
				len(evt.AddressArray), len(evt.ValueArray)))
		}
		for i := range evt.AddressArray {
			rollupData.TokenExchanges = append(rollupData.TokenExchanges,
				common.TokenExchange{
					EthBlockNum: blockNum,
					Address:     evt.AddressArray[i],
					ValueUSD:    int64(evt.ValueArray[i]),
				})
		}
	}

	varsUpdate := false

	for _, evt := range rollupEvents.UpdateForgeL1L2BatchTimeout {
		s.vars.Rollup.ForgeL1L2BatchTimeout = evt.NewForgeL1L2BatchTimeout
		varsUpdate = true
	}

	for _, evt := range rollupEvents.UpdateFeeAddToken {
		s.vars.Rollup.FeeAddToken = evt.NewFeeAddToken
		varsUpdate = true
	}

	for _, evt := range rollupEvents.UpdateWithdrawalDelay {
		s.vars.Rollup.WithdrawalDelay = evt.NewWithdrawalDelay
		varsUpdate = true
	}

	// NOTE: We skip the event rollupEvents.SafeMode because the
	// implementation RollupEventsByBlock already inserts a non-existing
	// RollupEventUpdateBucketsParameters into UpdateBucketsParameters with
	// all the bucket values at 0 and SafeMode = true

	for _, evt := range rollupEvents.UpdateBucketsParameters {
		for i, bucket := range evt.ArrayBuckets {
			s.vars.Rollup.Buckets[i] = common.BucketParams{
				CeilUSD:             bucket.CeilUSD,
				Withdrawals:         bucket.Withdrawals,
				BlockWithdrawalRate: bucket.BlockWithdrawalRate,
				MaxWithdrawals:      bucket.MaxWithdrawals,
			}
		}
		s.vars.Rollup.SafeMode = evt.SafeMode
		varsUpdate = true
	}

	if varsUpdate {
		s.vars.Rollup.EthBlockNum = blockNum
		rollupData.Vars = s.vars.Rollup.Copy()
	}

	return &rollupData, nil
}

func cutStringMax(s string, max int) string {
	if len(s) > max {
		return s[:max]
	}
	return s
}

// auctionSync gets information from the Auction Contract
func (s *Synchronizer) auctionSync(ethBlock *common.Block) (*common.AuctionData, error) {
	blockNum := ethBlock.Num
	var auctionData = common.NewAuctionData()

	// Get auction events in the block
	auctionEvents, err := s.ethClient.AuctionEventsByBlock(blockNum, &ethBlock.Hash)
	if err != nil && err.Error() == errStrUnknownBlock {
		return nil, tracerr.Wrap(ErrUnknownBlock)
	} else if err != nil {
		return nil, tracerr.Wrap(fmt.Errorf("AuctionEventsByBlock: %w", err))
	}
	// No events in this block
	if auctionEvents == nil {
		return &auctionData, nil
	}

	// Get bids
	for _, evt := range auctionEvents.NewBid {
		bid := common.Bid{
			SlotNum:     evt.Slot,
			BidValue:    evt.BidAmount,
			Bidder:      evt.Bidder,
			EthBlockNum: blockNum,
		}
		auctionData.Bids = append(auctionData.Bids, bid)
	}

	// Get Coordinators
	for _, evt := range auctionEvents.SetCoordinator {
		coordinator := common.Coordinator{
			Bidder:      evt.BidderAddress,
			Forger:      evt.ForgerAddress,
			URL:         evt.CoordinatorURL,
			EthBlockNum: blockNum,
		}
		auctionData.Coordinators = append(auctionData.Coordinators, coordinator)
	}

	varsUpdate := false

	for _, evt := range auctionEvents.NewSlotDeadline {
		s.vars.Auction.SlotDeadline = evt.NewSlotDeadline
		varsUpdate = true
	}
	for _, evt := range auctionEvents.NewClosedAuctionSlots {
		s.vars.Auction.ClosedAuctionSlots = evt.NewClosedAuctionSlots
		varsUpdate = true
	}
	for _, evt := range auctionEvents.NewOutbidding {
		s.vars.Auction.Outbidding = evt.NewOutbidding
		varsUpdate = true
	}
	for _, evt := range auctionEvents.NewDonationAddress {
		s.vars.Auction.DonationAddress = evt.NewDonationAddress
		varsUpdate = true
	}
	for _, evt := range auctionEvents.NewBootCoordinator {
		s.vars.Auction.BootCoordinator = evt.NewBootCoordinator
		s.vars.Auction.BootCoordinatorURL = evt.NewBootCoordinatorURL
		varsUpdate = true
		// Add new boot coordinator
		auctionData.Coordinators = append(auctionData.Coordinators, common.Coordinator{
			Forger:      evt.NewBootCoordinator,
			URL:         evt.NewBootCoordinatorURL,
			EthBlockNum: blockNum,
		})
	}
	for _, evt := range auctionEvents.NewOpenAuctionSlots {
		s.vars.Auction.OpenAuctionSlots = evt.NewOpenAuctionSlots
		varsUpdate = true
	}
	for _, evt := range auctionEvents.NewAllocationRatio {
		s.vars.Auction.AllocationRatio = evt.NewAllocationRatio
		varsUpdate = true
	}
	for _, evt := range auctionEvents.NewDefaultSlotSetBid {
		if evt.SlotSet > 6 { //nolint:gomnd
			return nil, tracerr.Wrap(fmt.Errorf("unexpected SlotSet in "+
				"auctionEvents.NewDefaultSlotSetBid: %v", evt.SlotSet))
		}
		s.vars.Auction.DefaultSlotSetBid[evt.SlotSet] = evt.NewInitialMinBid
		s.vars.Auction.DefaultSlotSetBidSlotNum = s.consts.Auction.SlotNum(blockNum) +
			int64(s.vars.Auction.ClosedAuctionSlots)
		varsUpdate = true
	}

	// NOTE: We ignore NewForgeAllocated
	// NOTE: We ignore NewForge because we're already tracking ForgeBatch event from Rollup
	// NOTE: We ignore HEZClaimed

	if varsUpdate {
		s.vars.Auction.EthBlockNum = blockNum
		auctionData.Vars = s.vars.Auction.Copy()
	}

	return &auctionData, nil
}

// wdelayerSync gets information from the Withdrawal Delayer Contract
func (s *Synchronizer) wdelayerSync(ethBlock *common.Block) (*common.WDelayerData, error) {
	blockNum := ethBlock.Num
	wDelayerData := common.NewWDelayerData()

	// Get wDelayer events in the block
	wDelayerEvents, err := s.ethClient.WDelayerEventsByBlock(blockNum, &ethBlock.Hash)
	if err != nil && err.Error() == errStrUnknownBlock {
		return nil, tracerr.Wrap(ErrUnknownBlock)
	} else if err != nil {
		return nil, tracerr.Wrap(fmt.Errorf("WDelayerEventsByBlock: %w", err))
	}
	// No events in this block
	if wDelayerEvents == nil {
		return &wDelayerData, nil
	}

	for _, evt := range wDelayerEvents.Deposit {
		wDelayerData.Deposits = append(wDelayerData.Deposits, common.WDelayerTransfer{
			Owner:  evt.Owner,
			Token:  evt.Token,
			Amount: evt.Amount,
		})
		wDelayerData.DepositsByTxHash[evt.TxHash] =
			append(wDelayerData.DepositsByTxHash[evt.TxHash],
				&wDelayerData.Deposits[len(wDelayerData.Deposits)-1])
	}
	for _, evt := range wDelayerEvents.Withdraw {
		wDelayerData.Withdrawals = append(wDelayerData.Withdrawals, common.WDelayerTransfer{
			Owner:  evt.Owner,
			Token:  evt.Token,
			Amount: evt.Amount,
		})
	}
	for _, evt := range wDelayerEvents.EscapeHatchWithdrawal {
		wDelayerData.EscapeHatchWithdrawals = append(wDelayerData.EscapeHatchWithdrawals,
			common.WDelayerEscapeHatchWithdrawal{
				EthBlockNum: blockNum,
				Who:         evt.Who,
				To:          evt.To,
				TokenAddr:   evt.Token,
				Amount:      evt.Amount,
			})
	}

	varsUpdate := false

	for range wDelayerEvents.EmergencyModeEnabled {
		s.vars.WDelayer.EmergencyMode = true
		s.vars.WDelayer.EmergencyModeStartingBlock = blockNum
		varsUpdate = true
	}
	for _, evt := range wDelayerEvents.NewWithdrawalDelay {
		s.vars.WDelayer.WithdrawalDelay = evt.WithdrawalDelay
		varsUpdate = true
	}
	for _, evt := range wDelayerEvents.NewEmergencyCouncil {
		s.vars.WDelayer.EmergencyCouncilAddress = evt.NewEmergencyCouncil
		varsUpdate = true
	}
	for _, evt := range wDelayerEvents.NewHermezGovernanceAddress {
		s.vars.WDelayer.HermezGovernanceAddress = evt.NewHermezGovernanceAddress
		varsUpdate = true
	}

	if varsUpdate {
		s.vars.WDelayer.EthBlockNum = blockNum
		wDelayerData.Vars = s.vars.WDelayer.Copy()
	}

	return &wDelayerData, nil
}

func getL1UserTx(eventsL1UserTx []eth.RollupEventL1UserTx, blockNum int64) ([]common.L1Tx, error) {
	l1Txs := make([]common.L1Tx, len(eventsL1UserTx))
	for i := range eventsL1UserTx {
		eventsL1UserTx[i].L1UserTx.EthBlockNum = blockNum
		// Check validity of L1UserTx
		l1Tx, err := common.NewL1Tx(&eventsL1UserTx[i].L1UserTx)
		if err != nil {
			return nil, tracerr.Wrap(err)
		}
		l1Txs[i] = *l1Tx
	}
	return l1Txs, nil
}