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292: Backfill gaps in the recent past on startup when tracking head. (#395)

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* Backfill gaps in the recent past when statediffing head.
This commit is contained in:
Thomas E Lackey 2023-06-23 21:04:57 -07:00 committed by Roy Crihfield
parent c4f16290c7
commit cc17762fdc
11 changed files with 296 additions and 18 deletions
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4
config.go
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@ -38,6 +38,10 @@ type Config struct {
ClientName string
// Whether to enable writing state diffs directly to track blockchain head
EnableWriteLoop bool
// The maximum number of blocks to backfill when tracking head.
BackfillMaxHeadGap uint64
// The maximum number of blocks behind the startup position to check for gaps.
BackfillCheckPastBlocks uint64
// Size of the worker pool
NumWorkers uint
// Should the statediff service wait until geth has synced to the head of the blockchain?

12
indexer/database/dump/indexer.go
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@ -419,6 +419,18 @@ func (sdi *StateDiffIndexer) HasBlock(hash common.Hash, number uint64) (bool, er
return false, nil
}
// CurrentBlock returns the HeaderModel of the highest existing block in the output.
// In the "dump" case, this is always nil.
func (sdi *StateDiffIndexer) CurrentBlock() (*models.HeaderModel, error) {
return nil, nil
}
// DetectGaps returns a list of gaps in the output found within the specified block range.
// In the "dump" case this is always nil.
func (sdi *StateDiffIndexer) DetectGaps(beginBlockNumber uint64, endBlockNumber uint64) ([]*interfaces.BlockGap, error) {
return nil, nil
}
// Close satisfies io.Closer
func (sdi *StateDiffIndexer) Close() error {
return sdi.dump.Close()

12
indexer/database/file/indexer.go
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@ -459,6 +459,18 @@ func (sdi *StateDiffIndexer) PushIPLD(batch interfaces.Batch, ipld sdtypes.IPLD)
return nil
}
// CurrentBlock returns the HeaderModel of the highest existing block in the output.
// In the "file" case, this is always nil.
func (sdi *StateDiffIndexer) CurrentBlock() (*models.HeaderModel, error) {
return nil, nil
}
// DetectGaps returns a list of gaps in the output found within the specified block range.
// In the "file" case this is always nil.
func (sdi *StateDiffIndexer) DetectGaps(beginBlockNumber uint64, endBlockNumber uint64) ([]*interfaces.BlockGap, error) {
return nil, nil
}
// HasBlock checks whether the indicated block already exists in the output.
// In the "file" case this is presumed to be false.
func (sdi *StateDiffIndexer) HasBlock(hash common.Hash, number uint64) (bool, error) {

10
indexer/database/sql/indexer.go
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@ -221,6 +221,16 @@ func (sdi *StateDiffIndexer) PushBlock(block *types.Block, receipts types.Receip
return blockTx, err
}
// CurrentBlock returns the HeaderModel of the highest existing block in the database.
func (sdi *StateDiffIndexer) CurrentBlock() (*models.HeaderModel, error) {
return sdi.dbWriter.maxHeader()
}
// DetectGaps returns a list of gaps in the database found within the specified block range.
func (sdi *StateDiffIndexer) DetectGaps(beginBlockNumber uint64, endBlockNumber uint64) ([]*interfaces.BlockGap, error) {
return sdi.dbWriter.detectGaps(beginBlockNumber, endBlockNumber)
}
// processHeader publishes and indexes a header IPLD in Postgres
// it returns the headerID
func (sdi *StateDiffIndexer) processHeader(tx *BatchTx, header *types.Header, headerNode ipld.IPLD, reward, td *big.Int) (string, error) {

2
indexer/database/sql/interfaces.go
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@ -45,6 +45,8 @@ type Driver interface {
// Statements interface to accommodate different SQL query syntax
type Statements interface {
DetectGapsStm() string
MaxHeaderStm() string
ExistsHeaderStm() string
InsertHeaderStm() string
InsertUncleStm() string

13
indexer/database/sql/postgres/database.go
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@ -41,8 +41,19 @@ type DB struct {
sql.Driver
}
// MaxHeaderStm satisfies the sql.Statements interface
func (db *DB) MaxHeaderStm() string {
return fmt.Sprintf("SELECT block_number, block_hash, parent_hash, cid, td, node_ids, reward, state_root, tx_root, receipt_root, uncles_hash, bloom, timestamp, coinbase FROM %s ORDER BY block_number DESC LIMIT 1", schema.TableHeader.Name)
}
// ExistsHeaderStm satisfies the sql.Statements interface
func (db *DB) ExistsHeaderStm() string {
return fmt.Sprintf("SELECT EXISTS(SELECT 1 from %s WHERE block_number = $1 AND block_hash = $2 LIMIT 1)", schema.TableHeader.Name)
return fmt.Sprintf("SELECT EXISTS(SELECT 1 from %s WHERE block_number = $1::BIGINT AND block_hash = $2::TEXT LIMIT 1)", schema.TableHeader.Name)
}
// DetectGapsStm satisfies the sql.Statements interface
func (db *DB) DetectGapsStm() string {
return fmt.Sprintf("SELECT block_number + 1 AS first_missing, (next_bn - 1) AS last_missing FROM (SELECT block_number, LEAD(block_number) OVER (ORDER BY block_number) AS next_bn FROM %s WHERE block_number >= $1::BIGINT AND block_number <= $2::BIGINT) h WHERE next_bn > block_number + 1", schema.TableHeader.Name)
}
// InsertHeaderStm satisfies the sql.Statements interface

47
indexer/database/sql/writer.go
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@ -27,6 +27,7 @@ import (
"github.com/shopspring/decimal"
"github.com/cerc-io/plugeth-statediff/indexer/database/metrics"
"github.com/cerc-io/plugeth-statediff/indexer/interfaces"
"github.com/cerc-io/plugeth-statediff/indexer/models"
)
@ -47,11 +48,55 @@ func (w *Writer) Close() error {
return w.db.Close()
}
// hasHeader returns true if a matching hash+number record exists in the database, else false.
func (w *Writer) hasHeader(blockHash common.Hash, blockNumber uint64) (exists bool, err error) {
err = w.db.QueryRow(w.db.Context(), w.db.ExistsHeaderStm(), blockNumber, blockHash.String()).Scan(&exists)
// pgx misdetects the parameter OIDs and selects int8, which can overflow.
// unfortunately there is no good place to override it, so it is safer to pass the uint64s as text
// and let PG handle the cast
err = w.db.QueryRow(w.db.Context(), w.db.ExistsHeaderStm(), strconv.FormatUint(blockNumber, 10), blockHash.String()).Scan(&exists)
return exists, err
}
// detectGaps returns a list of BlockGaps detected within the specified block range
// For example, if the database contains blocks the overall range 1000:2000, but is missing blocks 1110:1230 and 1380
// it would return [{FirstMissing: 1110, LastMissing: 1230}, {FirstMissing: 1380, LastMissing: 1380}]
func (w *Writer) detectGaps(beginBlockNumber uint64, endBlockNumber uint64) ([]*interfaces.BlockGap, error) {
var gaps []*interfaces.BlockGap
// pgx misdetects the parameter OIDs and selects int8, which can overflow.
// unfortunately there is no good place to override it, so it is safer to pass the uint64s as text
// and let PG handle the cast
err := w.db.Select(w.db.Context(), &gaps, w.db.DetectGapsStm(), strconv.FormatUint(beginBlockNumber, 10), strconv.FormatUint(endBlockNumber, 10))
return gaps, err
}
// maxHeader returns the header for the highest block number in the database.
// SELECT block_number, block_hash, parent_hash, cid, td, node_ids, reward, state_root, tx_root, receipt_root, uncles_hash, bloom, timestamp, coinbase FROM %s ORDER BY block_number DESC LIMIT 1
func (w *Writer) maxHeader() (*models.HeaderModel, error) {
var model models.HeaderModel
var err error
var number, td, reward uint64
err = w.db.QueryRow(w.db.Context(), w.db.MaxHeaderStm()).Scan(
&number,
&model.BlockHash,
&model.ParentHash,
&model.CID,
&td,
&model.NodeIDs,
&reward,
&model.StateRoot,
&model.TxRoot,
&model.RctRoot,
&model.UnclesHash,
&model.Bloom,
&model.Timestamp,
&model.Coinbase,
)
model.BlockNumber = strconv.FormatUint(number, 10)
model.TotalDifficulty = strconv.FormatUint(td, 10)
model.Reward = strconv.FormatUint(reward, 10)
return &model, err
}
/*
INSERT INTO eth.header_cids (block_number, block_hash, parent_hash, cid, td, node_ids, reward, state_root, tx_root, receipt_root, uncles_hash, bloom, timestamp, coinbase)
VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14)

10
indexer/interfaces/interfaces.go
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@ -20,14 +20,18 @@ import (
"math/big"
"time"
"github.com/cerc-io/plugeth-statediff/indexer/models"
"github.com/cerc-io/plugeth-statediff/indexer/shared"
sdtypes "github.com/cerc-io/plugeth-statediff/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
)
// StateDiffIndexer interface required to index statediff data
type StateDiffIndexer interface {
DetectGaps(beginBlock uint64, endBlock uint64) ([]*BlockGap, error)
CurrentBlock() (*models.HeaderModel, error)
HasBlock(hash common.Hash, number uint64) (bool, error)
PushBlock(block *types.Block, receipts types.Receipts, totalDifficulty *big.Int) (Batch, error)
PushStateNode(tx Batch, stateNode sdtypes.StateLeafNode, headerID string) error
@ -53,3 +57,9 @@ type Batch interface {
type Config interface {
Type() shared.DBType
}
// Used to represent a gap in statediffed blocks
type BlockGap struct {
FirstMissing uint64 `json:"firstMissing"`
LastMissing uint64 `json:"lastMissing"`
}

8
main/flags.go
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@ -52,6 +52,14 @@ func init() {
"statediff.waitforsync", false,
"Should the statediff service wait for geth to catch up to the head of the chain?",
)
Flags.Uint64Var(&config.BackfillCheckPastBlocks,
"statediff.backfillcheckpastblocks", 7200,
"Number of blocks behind the startup statediff position to check (and fill) for gaps when head tracking",
)
Flags.Uint64Var(&config.BackfillMaxHeadGap,
"statediff.backfillmaxheadgap", 7200,
"Maximum gap between the startup statediff and startup head positions that can be backfilled",
)
Flags.Var(&dbType,
"statediff.db.type",

155
service.go
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@ -18,9 +18,11 @@ package statediff
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"math/big"
"strconv"
"strings"
"sync"
"sync/atomic"
@ -80,6 +82,9 @@ type Service struct {
enableWriteLoop bool
// Parameters to use in the service write loop, if enabled
writeLoopParams ParamsWithMutex
// Settings to use for backfilling state diffs (plugging gaps when tracking head)
backfillMaxHeadGap uint64
backfillCheckPastBlocks uint64
// Size of the worker pool
numWorkers uint
// Number of retry for aborted transactions due to deadlock.
@ -167,6 +172,8 @@ func NewService(cfg Config, blockChain BlockChain, backend plugeth.Backend, inde
ShouldWaitForSync: cfg.WaitForSync,
indexer: indexer,
enableWriteLoop: cfg.EnableWriteLoop,
backfillMaxHeadGap: cfg.BackfillMaxHeadGap,
backfillCheckPastBlocks: cfg.BackfillCheckPastBlocks,
numWorkers: workers,
maxRetry: defaultRetryLimit,
jobStatusSubs: map[SubID]jobStatusSubscription{},
@ -555,6 +562,8 @@ func (sds *Service) Start() error {
go sds.PublishLoop(chainEventCh)
if sds.enableWriteLoop {
log.Info("Starting statediff DB backfill", "params", sds.writeLoopParams.Params)
go sds.Backfill()
log.Debug("Starting statediff DB write loop", "params", sds.writeLoopParams.Params)
chainEventCh := make(chan core.ChainEvent, chainEventChanSize)
go sds.WriteLoop(chainEventCh)
@ -916,3 +925,149 @@ func MapWatchAddressArgsToAddresses(args []types2.WatchAddressArg) ([]common.Add
return addresses, nil
}
// Backfill is executed on startup to make sure there are no gaps in the recent past when tracking head.
func (sds *Service) Backfill() {
chainBlock := sds.BlockChain.CurrentBlock()
if nil == chainBlock {
log.Info("Backfill: No previous chain block, nothing to backfill.")
return
}
chainBlockNumber := chainBlock.Number.Uint64()
if chainBlockNumber == 0 {
log.Info("Backfill: At start of chain, nothing to backfill.")
return
}
indexerBlock, err := sds.indexer.CurrentBlock()
if nil == indexerBlock {
log.Info("Backfill: No previous indexer block, nothing to backfill.")
return
}
if nil != err {
log.Error("Backfill error", err)
return
}
indexerBlockNumber, err := strconv.ParseUint(indexerBlock.BlockNumber, 10, 64)
if nil != err {
log.Error("Backfill error", err)
return
}
headGap := chainBlockNumber - indexerBlockNumber
log.Info(
"Backfill: initial positions",
"chain", chainBlockNumber,
"indexer", indexerBlockNumber,
"headGap", headGap,
)
if sds.backfillMaxHeadGap > 0 && headGap > 0 {
if headGap < sds.backfillMaxHeadGap {
sds.backfillHeadGap(indexerBlockNumber, chainBlockNumber)
log.Info("Backfill: all workers done filling headGap.")
} else {
log.Error("Backfill: headGap too large to fill.")
}
}
if sds.backfillCheckPastBlocks > 0 {
var gapCheckBeginNumber uint64 = 0
if indexerBlockNumber > sds.backfillCheckPastBlocks {
gapCheckBeginNumber = indexerBlockNumber - sds.backfillCheckPastBlocks
}
blockGaps, err := sds.indexer.DetectGaps(gapCheckBeginNumber, chainBlockNumber)
if nil != err {
log.Error("Backfill error", err)
return
}
if nil != blockGaps && len(blockGaps) > 0 {
gapsMsg, _ := json.Marshal(blockGaps)
log.Info("Backfill: detected gaps in range", "begin", gapCheckBeginNumber, "end", chainBlockNumber, "gaps", string(gapsMsg))
sds.backfillDetectedGaps(blockGaps)
log.Info("Backfill: done processing detected gaps in range", "begin", gapCheckBeginNumber, "end", chainBlockNumber, "gaps", string(gapsMsg))
} else {
log.Info("Backfill: no gaps detected in range", "begin", gapCheckBeginNumber, "end", chainBlockNumber)
}
}
}
// backfillHeadGap fills in any gap between the statediff position and the chain position at startup.
// A gap can be created in this way if there is some problem in statediffing (eg, DB connectivity is lost,
// while the chain keeps syncing), if the process is terminated with a statediff in-flight, etc.
func (sds *Service) backfillHeadGap(indexerBlockNumber uint64, chainBlockNumber uint64) {
var ch = make(chan uint64)
var wg sync.WaitGroup
for i := uint(0); i < sds.numWorkers; i++ {
wg.Add(1)
go func(w uint) {
defer wg.Done()
for {
select {
case num, ok := <-ch:
if !ok {
log.Info("Backfill: headGap done", "worker", w)
return
}
log.Info("Backfill: backfilling head gap", "block", num, "worker", w)
err := sds.writeStateDiffAt(num, sds.writeLoopParams.Params)
if err != nil {
log.Error("Backfill error", err)
}
case <-sds.QuitChan:
log.Info("Backfill: quitting before finish", "worker", w)
return
}
}
}(i)
}
for bn := indexerBlockNumber + 1; bn <= chainBlockNumber; bn++ {
ch <- bn
}
close(ch)
wg.Wait()
}
// backfillDetectedGaps fills gaps which have occurred in the recent past. These gaps can happen because of
// transient errors, such as DB errors that are later corrected (so head statediffing continues, but with a hole)
// a missed ChainEvent (happens sometimes when debugging), or if the process is terminated when an earlier block
// is still in-flight, but a later block was already written.
func (sds *Service) backfillDetectedGaps(blockGaps []*interfaces.BlockGap) {
var ch = make(chan uint64)
var wg sync.WaitGroup
for i := uint(0); i < sds.numWorkers; i++ {
wg.Add(1)
go func(w uint) {
defer wg.Done()
for {
select {
case num, ok := <-ch:
if !ok {
log.Info("Backfill: detected gap fill done", "worker", w)
return
}
log.Info("Backfill: backfilling detected gap", "block", num, "worker", w)
err := sds.writeStateDiffAt(num, sds.writeLoopParams.Params)
if err != nil {
log.Error("Backfill error: ", err)
}
case <-sds.QuitChan:
log.Info("Backfill: quitting before finish", "worker", w)
return
}
}
}(i)
}
for _, gap := range blockGaps {
for num := gap.FirstMissing; num <= gap.LastMissing; num++ {
ch <- num
}
}
close(ch)
wg.Wait()
}

9
test_helpers/mocks/indexer.go
View File

@ -24,6 +24,7 @@ import (
"github.com/ethereum/go-ethereum/core/types"
"github.com/cerc-io/plugeth-statediff/indexer/interfaces"
"github.com/cerc-io/plugeth-statediff/indexer/models"
sdtypes "github.com/cerc-io/plugeth-statediff/types"
)
@ -33,6 +34,14 @@ var _ interfaces.Batch = &batch{}
// StateDiffIndexer is a mock state diff indexer
type StateDiffIndexer struct{}
func (sdi *StateDiffIndexer) DetectGaps(beginBlock uint64, endBlock uint64) ([]*interfaces.BlockGap, error) {
return nil, nil
}
func (sdi *StateDiffIndexer) CurrentBlock() (*models.HeaderModel, error) {
return nil, nil
}
type batch struct{}
func (sdi *StateDiffIndexer) HasBlock(hash common.Hash, number uint64) (bool, error) {