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package synchronizer
import (
"context"
"database/sql"
"errors"
"strconv"
"sync"
"github.com/hermeznetwork/hermez-node/common"
"github.com/hermeznetwork/hermez-node/db/historydb"
"github.com/hermeznetwork/hermez-node/db/statedb"
"github.com/hermeznetwork/hermez-node/eth"
"github.com/hermeznetwork/hermez-node/log"
)
var (
// ErrNotAbleToSync is used when there is not possible to find a valid block to sync
ErrNotAbleToSync = errors.New("it has not been possible to synchronize any block")
)
// rollupData contains information returned by the Rollup SC
type rollupData struct {
l1Txs []*common.L1Tx
batches []*BatchData
// withdrawals []*common.ExitInfo
registeredTokens []*common.Token
rollupVars *common.RollupVars
}
// NewRollupData creates an empty rollupData with the slices initialized.
func newRollupData() rollupData {
return rollupData{
l1Txs: make([]*common.L1Tx, 0),
batches: make([]*BatchData, 0),
// withdrawals: make([]*common.ExitInfo, 0),
registeredTokens: make([]*common.Token, 0),
}
}
// auctionData contains information returned by the Action SC
type auctionData struct {
bids []*common.Bid
coordinators []*common.Coordinator
auctionVars *common.AuctionVars
}
// newAuctionData creates an empty auctionData with the slices initialized.
func newAuctionData() *auctionData {
return &auctionData{
bids: make([]*common.Bid, 0),
coordinators: make([]*common.Coordinator, 0),
}
}
// BatchData contains information about Batches from the contracts
type BatchData struct {
l1UserTxs []*common.L1Tx
l1CoordinatorTxs []*common.L1Tx
l2Txs []*common.L2Tx
createdAccounts []*common.Account
exitTree []*common.ExitInfo
batch *common.Batch
}
// NewBatchData creates an empty BatchData with the slices initialized.
func NewBatchData() *BatchData {
return &BatchData{
l1UserTxs: make([]*common.L1Tx, 0),
l1CoordinatorTxs: make([]*common.L1Tx, 0),
l2Txs: make([]*common.L2Tx, 0),
createdAccounts: make([]*common.Account, 0),
exitTree: make([]*common.ExitInfo, 0),
}
}
// BlockData contains information about Blocks from the contracts
type BlockData struct {
block *common.Block
// Rollup
l1Txs []*common.L1Tx // TODO: Answer: User? Coordinator? Both?
batches []*BatchData // TODO: Also contains L1Txs!
// withdrawals []*common.ExitInfo // TODO
registeredTokens []*common.Token
rollupVars *common.RollupVars
// Auction
bids []*common.Bid
coordinators []*common.Coordinator
auctionVars *common.AuctionVars
// WithdrawalDelayer
withdrawalDelayerVars *common.WithdrawalDelayerVars
}
// Synchronizer implements the Synchronizer type
type Synchronizer struct {
ethClient *eth.Client
historyDB *historydb.HistoryDB
stateDB *statedb.StateDB
firstSavedBlock *common.Block
mux sync.Mutex
}
// NewSynchronizer creates a new Synchronizer
func NewSynchronizer(ethClient *eth.Client, historyDB *historydb.HistoryDB, stateDB *statedb.StateDB) *Synchronizer {
s := &Synchronizer{
ethClient: ethClient,
historyDB: historyDB,
stateDB: stateDB,
}
return s
}
// TODO: Be smart about locking: only lock during the read/write operations
// Sync updates History and State DB with information from the blockchain
// TODO: Return true if a new block was processed
// TODO: Add argument: maximum number of blocks to process
// TODO: Check reorgs in the middle of syncing a block. Probably make
// rollupSync, auctionSync and withdrawalSync return the block hash.
func (s *Synchronizer) Sync() error {
// Avoid new sync while performing one
s.mux.Lock()
defer s.mux.Unlock()
var nextBlockNum int64 // next block number to sync
// Get lastSavedBlock from History DB
lastSavedBlock, err := s.historyDB.GetLastBlock()
if err != nil && err != sql.ErrNoRows {
return err
}
// If we don't have any stored block, we must do a full sync starting from the rollup genesis block
if err == sql.ErrNoRows {
// TODO: Query rollup constants and genesis information, store them
nextBlockNum = 1234 // TODO: Replace this with genesisBlockNum
} else {
// Get the latest block we have in History DB from blockchain to detect a reorg
ethBlock, err := s.ethClient.EthBlockByNumber(context.Background(), lastSavedBlock.EthBlockNum)
if err != nil {
return err
}
if ethBlock.Hash != lastSavedBlock.Hash {
// Reorg detected
log.Debugf("Reorg Detected...")
_, err := s.reorg(lastSavedBlock)
if err != nil {
return err
}
lastSavedBlock, err = s.historyDB.GetLastBlock()
if err != nil {
return err
}
}
nextBlockNum = lastSavedBlock.EthBlockNum + 1
}
log.Debugf("Syncing...")
// Get latest blockNum in blockchain
latestBlockNum, err := s.ethClient.EthCurrentBlock()
if err != nil {
return err
}
log.Debugf("Blocks to sync: %v (firstBlockToSync: %v, latestBlock: %v)", latestBlockNum-nextBlockNum+1, nextBlockNum, latestBlockNum)
for nextBlockNum < latestBlockNum {
ethBlock, err := s.ethClient.EthBlockByNumber(context.Background(), nextBlockNum)
if err != nil {
return err
}
// TODO: Check that the obtianed ethBlock.ParentHash == prevEthBlock.Hash; if not, reorg!
// TODO: Send the ethHash in rollupSync(), auctionSync() and
// wdelayerSync() and make sure they all use the same block
// hash.
// Get data from the rollup contract
rollupData, err := s.rollupSync(nextBlockNum)
if err != nil {
return err
}
// Get data from the auction contract
auctionData, err := s.auctionSync(nextBlockNum)
if err != nil {
return err
}
// Get data from the WithdrawalDelayer contract
wdelayerData, err := s.wdelayerSync(nextBlockNum)
if err != nil {
return err
}
// Group all the block data into the structs to save into HistoryDB
var blockData BlockData
blockData.block = ethBlock
if rollupData != nil {
blockData.l1Txs = rollupData.l1Txs
blockData.batches = rollupData.batches
// blockData.withdrawals = rollupData.withdrawals // TODO
blockData.registeredTokens = rollupData.registeredTokens
blockData.rollupVars = rollupData.rollupVars
}
if auctionData != nil {
blockData.bids = auctionData.bids
blockData.coordinators = auctionData.coordinators
blockData.auctionVars = auctionData.auctionVars
}
if wdelayerData != nil {
blockData.withdrawalDelayerVars = wdelayerData
}
// Add rollupData and auctionData once the method is updated
// TODO: Save Whole Struct -> AddBlockSCData(blockData)
err = s.historyDB.AddBlock(blockData.block)
if err != nil {
return err
}
}
return 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) {
var block *common.Block
blockNum := uncleBlock.EthBlockNum
found := false
log.Debugf("Reorg first uncle block: %v", blockNum)
// Iterate History DB and the blokchain looking for the latest valid block
for !found && blockNum > s.firstSavedBlock.EthBlockNum {
ethBlock, err := s.ethClient.EthBlockByNumber(context.Background(), blockNum)
if err != nil {
return 0, err
}
block, err = s.historyDB.GetBlock(blockNum)
if err != nil {
return 0, err
}
if block.Hash == ethBlock.Hash {
found = true
log.Debugf("Found valid block: %v", blockNum)
} else {
log.Debugf("Discarding block: %v", blockNum)
}
blockNum--
}
if found {
// Set History DB and State DB to the correct state
err := s.historyDB.Reorg(block.EthBlockNum)
if err != nil {
return 0, err
}
batchNum, err := s.historyDB.GetLastBatchNum()
if err != nil && err != sql.ErrNoRows {
return 0, err
}
if batchNum != 0 {
err = s.stateDB.Reset(batchNum)
if err != nil {
return 0, err
}
}
return block.EthBlockNum, nil
}
return 0, ErrNotAbleToSync
}
// Status returns current status values from the Synchronizer
func (s *Synchronizer) Status() (*common.SyncStatus, error) {
// Avoid possible inconsistencies
s.mux.Lock()
defer s.mux.Unlock()
var status *common.SyncStatus
// TODO: Join all queries to the DB into a single transaction so that
// we can remove the mutex locking here:
// - HistoryDB.GetLastBlock
// - HistoryDB.GetLastBatchNum
// - HistoryDB.GetCurrentForgerAddr
// - HistoryDB.GetNextForgerAddr
// Get latest block in History DB
lastSavedBlock, err := s.historyDB.GetLastBlock()
if err != nil {
return nil, err
}
status.CurrentBlock = lastSavedBlock.EthBlockNum
// Get latest batch in History DB
lastSavedBatch, err := s.historyDB.GetLastBatchNum()
if err != nil && err != sql.ErrNoRows {
return nil, err
}
status.CurrentBatch = lastSavedBatch
// Get latest blockNum in blockchain
latestBlockNum, err := s.ethClient.EthCurrentBlock()
if err != nil {
return nil, err
}
// TODO: Get CurrentForgerAddr & NextForgerAddr from the Auction SC / Or from the HistoryDB
// Check if Synchronizer is synchronized
status.Synchronized = status.CurrentBlock == latestBlockNum
return status, nil
}
// rollupSync gets information from the Rollup Contract
func (s *Synchronizer) rollupSync(blockNum int64) (*rollupData, error) {
var rollupData = newRollupData()
// var forgeL1TxsNum int64
var numAccounts int
// Get rollup events in the block
rollupEvents, _, err := s.ethClient.RollupEventsByBlock(blockNum)
if err != nil {
return nil, err
}
// TODO: Replace GetLastL1TxsNum by GetNextL1TxsNum
nextForgeL1TxsNum := int64(0)
nextForgeL1TxsNumPtr, err := s.historyDB.GetLastL1TxsNum()
if err != nil {
return nil, err
}
if nextForgeL1TxsNumPtr != nil {
nextForgeL1TxsNum = *nextForgeL1TxsNumPtr + 1
}
// Get newLastIdx that will be used to complete the accounts
// idx, err := s.getIdx(rollupEvents)
// if err != nil {
// return nil, err
// }
// Get L1UserTX
rollupData.l1Txs = getL1UserTx(rollupEvents.L1UserTx, blockNum)
// Get ForgeBatch events to get the L1CoordinatorTxs
for _, fbEvent := range rollupEvents.ForgeBatch {
batchData := NewBatchData()
position := 0
// Get the input for each Tx
forgeBatchArgs, err := s.ethClient.RollupForgeBatchArgs(fbEvent.EthTxHash)
if err != nil {
return nil, err
}
forgeL1TxsNum := int64(0)
// Check if this is a L1Batch to get L1 Tx from it
if forgeBatchArgs.L1Batch {
forgeL1TxsNum = nextForgeL1TxsNum
// Get L1 User Txs from History DB
// TODO: Get L1TX from HistoryDB filtered by toforgeL1txNum & fromidx = 0 and
// update batch number and add accounts to createdAccounts updating idx
// l1UserTxs, err := s.historyDB.GetL1UserTxs(nextForgeL1TxsNum)
// If HistoryDB doesn't have L1UserTxs at
// nextForgeL1TxsNum, check if they exist in
// rollupData.l1Txs. This could happen because in a
// block there could be multiple batches with L1Batch =
// true (although it's a very rare case). If the
// L1UserTxs are not in rollupData.l1Txs, use an empty
// array (this happens when the L1UserTxs queue is
// frozen but didn't store any tx).
l1UserTxs := []common.L1Tx{}
position = len(l1UserTxs)
// Get L1 Coordinator Txs
for _, l1CoordinatorTx := range forgeBatchArgs.L1CoordinatorTxs {
l1CoordinatorTx.Position = position
l1CoordinatorTx.ToForgeL1TxsNum = nextForgeL1TxsNum
l1CoordinatorTx.TxID = common.TxID(common.Hash([]byte("0x01" + strconv.FormatInt(int64(nextForgeL1TxsNum), 10) + strconv.FormatInt(int64(l1CoordinatorTx.Position), 10) + "00")))
l1CoordinatorTx.UserOrigin = false
l1CoordinatorTx.EthBlockNum = blockNum
bn := new(common.BatchNum)
*bn = common.BatchNum(fbEvent.BatchNum)
l1CoordinatorTx.BatchNum = bn
batchData.l1CoordinatorTxs = append(batchData.l1CoordinatorTxs, l1CoordinatorTx)
// Check if we have to register an account
// if l1CoordinatorTx.FromIdx == 0 {
// account := common.Account{
// // TODO: Uncommnent when common.account has IDx
// // IDx: common.Idx(idx),
// TokenID: l1CoordinatorTx.TokenID,
// Nonce: 0,
// Balance: l1CoordinatorTx.LoadAmount,
// PublicKey: l1CoordinatorTx.FromBJJ,
// EthAddr: l1CoordinatorTx.FromEthAddr,
// }
// idx++
// batchData.createdAccounts = append(batchData.createdAccounts, &account)
// numAccounts++
// }
position++
}
nextForgeL1TxsNum++
}
// Get L2Txs
poolL2Txs := common.L2TxsToPoolL2Txs(forgeBatchArgs.L2Txs) // TODO: This is a big uggly, find a better way
// Get exitTree
// TODO: Get createdAccounts from ProcessTxs()
// TODO: Get CollectedFees from ProcessTxs()
// TODO: Pass forgeBatchArgs.FeeIdxCoordinator to ProcessTxs()
_, exitInfo, err := s.stateDB.ProcessTxs(true, false, batchData.l1UserTxs, batchData.l1CoordinatorTxs, poolL2Txs)
if err != nil {
return nil, err
}
l2Txs := common.PoolL2TxsToL2Txs(poolL2Txs) // TODO: This is a big uggly, find a better way
batchData.l2Txs = append(batchData.l2Txs, l2Txs...)
batchData.exitTree = exitInfo
// Get Batch information
batch := &common.Batch{
BatchNum: common.BatchNum(fbEvent.BatchNum),
EthBlockNum: blockNum,
// ForgerAddr: , TODO: Get it from ethClient -> Add ForgerAddr to RollupEventForgeBatch
// CollectedFees: , TODO: Clarify where to get them if they are still needed
StateRoot: common.Hash(forgeBatchArgs.NewStRoot.Bytes()),
NumAccounts: numAccounts,
ExitRoot: common.Hash(forgeBatchArgs.NewExitRoot.Bytes()),
ForgeL1TxsNum: forgeL1TxsNum,
// SlotNum: TODO: Calculate once ethClient provides the info // calculate from blockNum + ethClient Constants
}
batchData.batch = batch
rollupData.batches = append(rollupData.batches, batchData)
}
// Get Registered Tokens
for _, eAddToken := range rollupEvents.AddToken {
var token *common.Token
token.TokenID = common.TokenID(eAddToken.TokenID)
token.EthAddr = eAddToken.Address
token.EthBlockNum = blockNum
// TODO: Add external information consulting SC about it using Address
rollupData.registeredTokens = append(rollupData.registeredTokens, token)
}
// TODO: rollupEvents.UpdateForgeL1L2BatchTimeout
// TODO: rollupEvents.UpdateFeeAddToken
// TODO: rollupEvents.WithdrawEvent
// TODO: Emergency Mechanism
// TODO: Variables
// TODO: Constants
return &rollupData, nil
}
// auctionSync gets information from the Auction Contract
func (s *Synchronizer) auctionSync(blockNum int64) (*auctionData, error) {
var auctionData = newAuctionData()
// Get auction events in the block
auctionEvents, _, err := s.ethClient.AuctionEventsByBlock(blockNum)
if err != nil {
return nil, err
}
// Get bids
for _, eNewBid := range auctionEvents.NewBid {
bid := &common.Bid{
SlotNum: common.SlotNum(eNewBid.Slot),
BidValue: eNewBid.BidAmount,
ForgerAddr: eNewBid.CoordinatorForger,
EthBlockNum: blockNum,
}
auctionData.bids = append(auctionData.bids, bid)
}
// Get Coordinators
for _, eNewCoordinator := range auctionEvents.NewCoordinator {
coordinator := &common.Coordinator{
Forger: eNewCoordinator.ForgerAddress,
WithdrawAddr: eNewCoordinator.WithdrawalAddress,
URL: eNewCoordinator.CoordinatorURL,
}
auctionData.coordinators = append(auctionData.coordinators, coordinator)
}
// TODO: NewSlotDeadline
// TODO: NewClosedAuctionSlots
// TODO: NewOutbidding
// TODO: NewDonationAddress
// TODO: NewBootCoordinator
// TODO: NewOpenAuctionSlots
// TODO: NewAllocationRatio
// TODO: NewForgeAllocated
// TODO: NewDefaultSlotSetBid
// TODO: NewForge
// TODO: HEZClaimed
// TODO: Think about separating new coordinaors from coordinator updated
// Get Coordinators from updates
for _, eCoordinatorUpdated := range auctionEvents.CoordinatorUpdated {
coordinator := &common.Coordinator{
Forger: eCoordinatorUpdated.ForgerAddress,
WithdrawAddr: eCoordinatorUpdated.WithdrawalAddress,
URL: eCoordinatorUpdated.CoordinatorURL,
}
auctionData.coordinators = append(auctionData.coordinators, coordinator)
}
// TODO: VARS
// TODO: CONSTANTS
return auctionData, nil
}
// wdelayerSync gets information from the Withdrawal Delayer Contract
func (s *Synchronizer) wdelayerSync(blockNum int64) (*common.WithdrawalDelayerVars, error) {
// TODO: VARS
// TODO: CONSTANTS
return nil, nil
}
// func (s *Synchronizer) getIdx(rollupEvents *eth.RollupEvents) (int64, error) {
// // TODO: FIXME: There will be an error here when `len(rollupEvents.ForgeBatch) == 0`
// lastForgeBatch := rollupEvents.ForgeBatch[len(rollupEvents.ForgeBatch)-1]
//
// // TODO: RollupForgeBatchArgs is already called in `rollupSync`.
// // Ideally it should not need to be called twice for the same batch.
// // Get the input for forgeBatch
// forgeBatchArgs, err := s.ethClient.RollupForgeBatchArgs(lastForgeBatch.EthTxHash)
// if err != nil {
// return 0, err
// }
//
// return forgeBatchArgs.NewLastIdx + 1, nil
// }
func getL1UserTx(l1UserTxEvents []eth.RollupEventL1UserTx, blockNum int64) []*common.L1Tx {
l1Txs := make([]*common.L1Tx, 0)
for _, eL1UserTx := range l1UserTxEvents {
// Fill aditional Tx fields
eL1UserTx.L1Tx.TxID = common.TxID(common.Hash([]byte("0x00" + strconv.FormatInt(int64(eL1UserTx.ToForgeL1TxsNum), 10) + strconv.FormatInt(int64(eL1UserTx.Position), 10) + "00")))
eL1UserTx.L1Tx.ToForgeL1TxsNum = eL1UserTx.ToForgeL1TxsNum
eL1UserTx.L1Tx.Position = eL1UserTx.Position
eL1UserTx.L1Tx.UserOrigin = true
eL1UserTx.L1Tx.EthBlockNum = blockNum
l1Txs = append(l1Txs, &eL1UserTx.L1Tx)
}
return l1Txs
}