Refactor and add comments.
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2bf4c91269
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b091f3382e
@ -327,145 +327,6 @@ type workerParams struct {
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id uint
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}
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func (sds *Service) backfillDetectedGaps(blockGaps []*interfaces.BlockGap) {
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var ch = make(chan uint64)
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var wg sync.WaitGroup
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for i := uint(0); i < sds.numWorkers; i++ {
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wg.Add(1)
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go func(w uint) {
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defer wg.Done()
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for {
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select {
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case num, ok := <-ch:
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if !ok {
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log.Info("Backfill: detected gap fill done", "worker", w)
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return
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}
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log.Info("Backfill: backfilling detected gap", "block", num, "worker", w)
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err := sds.writeStateDiffAt(num, writeLoopParams.Params)
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if err != nil {
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log.Error("Backfill error: " + err.Error())
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}
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case <-sds.QuitChan:
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log.Info("Backfill: quitting before finish", "worker", w)
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return
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}
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}
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}(i)
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}
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for _, gap := range blockGaps {
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for num := gap.FirstMissing; num <= gap.LastMissing; num++ {
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ch <- num
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}
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}
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close(ch)
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wg.Wait()
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}
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func (sds *Service) backfillHeadGap(indexerBlockNumber uint64, chainBlockNumber uint64) {
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headGap := chainBlockNumber - indexerBlockNumber
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var ch = make(chan uint64, headGap)
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for bn := indexerBlockNumber; bn < chainBlockNumber; bn++ {
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ch <- bn
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}
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var wg sync.WaitGroup
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for i := uint(0); i < sds.numWorkers; i++ {
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wg.Add(1)
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go func(w uint) {
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defer wg.Done()
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for {
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select {
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case num, ok := <-ch:
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if !ok {
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log.Info("Backfill: headGap done", "worker", w)
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return
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}
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log.Info("Backfill: backfilling head gap", "block", num, "worker", w)
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err := sds.writeStateDiffAt(num, writeLoopParams.Params)
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if err != nil {
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log.Error("Backfill error: " + err.Error())
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}
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case <-sds.QuitChan:
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log.Info("Backfill: quitting before finish", "worker", w)
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return
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}
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}
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}(i)
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}
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close(ch)
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wg.Wait()
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}
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func (sds *Service) Backfill() {
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chainBlock := sds.BlockChain.CurrentBlock()
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if nil == chainBlock {
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log.Info("Backfill: No previous chain block, nothing to backfill.")
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return
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}
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chainBlockNumber := chainBlock.Number.Uint64()
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if chainBlockNumber == 0 {
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log.Info("Backfill: At start of chain, nothing to backfill.")
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return
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}
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indexerBlock, err := sds.indexer.CurrentBlock()
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if nil == indexerBlock {
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log.Info("Backfill: No previous indexer block, nothing to backfill.")
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return
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}
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if nil != err {
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log.Error("Backfill error: " + err.Error())
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return
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}
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indexerBlockNumber, err := strconv.ParseUint(indexerBlock.BlockNumber, 10, 64)
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if nil != err {
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log.Error("Backfill error: " + err.Error())
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return
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}
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headGap := chainBlockNumber - indexerBlockNumber
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log.Info(
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"Backfill: initial positions",
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"chain", chainBlockNumber,
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"indexer", indexerBlockNumber,
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"headGap", headGap,
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)
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if sds.backfillMaxHeadGap > 0 && headGap > 0 {
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if headGap < sds.backfillMaxHeadGap {
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sds.backfillHeadGap(indexerBlockNumber, chainBlockNumber)
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log.Info("Backfill: all workers done filling headGap.")
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} else {
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log.Error("Backfill: headGap too large to fill.")
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}
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}
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if sds.backfillCheckPastBlocks > 0 {
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var gapCheckBeginNumber uint64 = 0
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if indexerBlockNumber > sds.backfillCheckPastBlocks {
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gapCheckBeginNumber = indexerBlockNumber - sds.backfillCheckPastBlocks
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}
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blockGaps, err := sds.indexer.DetectGaps(gapCheckBeginNumber, chainBlockNumber)
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if nil != err {
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log.Error("Backfill error: " + err.Error())
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return
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}
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if nil != blockGaps && len(blockGaps) > 0 {
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gapsMsg, _ := json.Marshal(blockGaps)
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log.Info("Backfill: detected gaps in range", "begin", gapCheckBeginNumber, "end", chainBlockNumber, "gaps", string(gapsMsg))
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sds.backfillDetectedGaps(blockGaps)
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log.Info("Backfill: done processing detected gaps in range", "begin", gapCheckBeginNumber, "end", chainBlockNumber, "gaps", string(gapsMsg))
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} else {
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log.Info("Backfill: no gaps detected in range", "begin", gapCheckBeginNumber, "end", chainBlockNumber)
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}
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}
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}
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func (sds *Service) WriteLoop(chainEventCh chan core.ChainEvent) {
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chainEventSub := sds.BlockChain.SubscribeChainEvent(chainEventCh)
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defer chainEventSub.Unsubscribe()
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@ -1250,3 +1111,150 @@ func MapWatchAddressArgsToAddresses(args []types2.WatchAddressArg) ([]common.Add
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return addresses, nil
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}
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// Backfill is executed on startup to make sure there are no gaps in the recent past when tracking head.
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func (sds *Service) Backfill() {
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chainBlock := sds.BlockChain.CurrentBlock()
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if nil == chainBlock {
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log.Info("Backfill: No previous chain block, nothing to backfill.")
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return
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}
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chainBlockNumber := chainBlock.Number.Uint64()
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if chainBlockNumber == 0 {
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log.Info("Backfill: At start of chain, nothing to backfill.")
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return
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}
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indexerBlock, err := sds.indexer.CurrentBlock()
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if nil == indexerBlock {
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log.Info("Backfill: No previous indexer block, nothing to backfill.")
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return
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}
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if nil != err {
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log.Error("Backfill error: " + err.Error())
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return
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}
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indexerBlockNumber, err := strconv.ParseUint(indexerBlock.BlockNumber, 10, 64)
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if nil != err {
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log.Error("Backfill error: " + err.Error())
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return
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}
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headGap := chainBlockNumber - indexerBlockNumber
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log.Info(
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"Backfill: initial positions",
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"chain", chainBlockNumber,
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"indexer", indexerBlockNumber,
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"headGap", headGap,
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)
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if sds.backfillMaxHeadGap > 0 && headGap > 0 {
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if headGap < sds.backfillMaxHeadGap {
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sds.backfillHeadGap(indexerBlockNumber, chainBlockNumber)
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log.Info("Backfill: all workers done filling headGap.")
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} else {
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log.Error("Backfill: headGap too large to fill.")
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}
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}
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if sds.backfillCheckPastBlocks > 0 {
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var gapCheckBeginNumber uint64 = 0
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if indexerBlockNumber > sds.backfillCheckPastBlocks {
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gapCheckBeginNumber = indexerBlockNumber - sds.backfillCheckPastBlocks
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}
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blockGaps, err := sds.indexer.DetectGaps(gapCheckBeginNumber, chainBlockNumber)
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if nil != err {
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log.Error("Backfill error: " + err.Error())
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return
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}
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if nil != blockGaps && len(blockGaps) > 0 {
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gapsMsg, _ := json.Marshal(blockGaps)
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log.Info("Backfill: detected gaps in range", "begin", gapCheckBeginNumber, "end", chainBlockNumber, "gaps", string(gapsMsg))
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sds.backfillDetectedGaps(blockGaps)
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log.Info("Backfill: done processing detected gaps in range", "begin", gapCheckBeginNumber, "end", chainBlockNumber, "gaps", string(gapsMsg))
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} else {
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log.Info("Backfill: no gaps detected in range", "begin", gapCheckBeginNumber, "end", chainBlockNumber)
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}
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}
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}
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// backfillHeadGap fills in any gap between the statediff position and the chain position at startup.
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// A gap can be created in this way if there is some problem in statediffing (eg, DB connectivity is lost,
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// while the chain keeps syncing), if the process is terminated with a statediff in-flight, etc.
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func (sds *Service) backfillHeadGap(indexerBlockNumber uint64, chainBlockNumber uint64) {
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headGap := chainBlockNumber - indexerBlockNumber
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var ch = make(chan uint64, headGap)
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for bn := indexerBlockNumber; bn < chainBlockNumber; bn++ {
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ch <- bn
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}
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var wg sync.WaitGroup
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for i := uint(0); i < sds.numWorkers; i++ {
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wg.Add(1)
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go func(w uint) {
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defer wg.Done()
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for {
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select {
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case num, ok := <-ch:
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if !ok {
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log.Info("Backfill: headGap done", "worker", w)
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return
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}
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log.Info("Backfill: backfilling head gap", "block", num, "worker", w)
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err := sds.writeStateDiffAt(num, writeLoopParams.Params)
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if err != nil {
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log.Error("Backfill error: " + err.Error())
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}
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case <-sds.QuitChan:
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log.Info("Backfill: quitting before finish", "worker", w)
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return
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}
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}
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}(i)
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}
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close(ch)
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wg.Wait()
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}
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// backfillDetectedGaps fills gaps which have occurred in the recent past. These gaps can happen because of
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// transient errors, such as DB errors that are later corrected (so head statediffing continues, but with a hole)
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// a missed ChainEvent (happens sometimes when debugging), or if the process is terminated when an earlier block
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// is still in-flight, but a later block was already written.
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func (sds *Service) backfillDetectedGaps(blockGaps []*interfaces.BlockGap) {
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var ch = make(chan uint64)
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var wg sync.WaitGroup
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for i := uint(0); i < sds.numWorkers; i++ {
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wg.Add(1)
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go func(w uint) {
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defer wg.Done()
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for {
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select {
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case num, ok := <-ch:
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if !ok {
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log.Info("Backfill: detected gap fill done", "worker", w)
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return
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}
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log.Info("Backfill: backfilling detected gap", "block", num, "worker", w)
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err := sds.writeStateDiffAt(num, writeLoopParams.Params)
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if err != nil {
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log.Error("Backfill error: " + err.Error())
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}
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case <-sds.QuitChan:
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log.Info("Backfill: quitting before finish", "worker", w)
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return
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}
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}
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}(i)
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}
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for _, gap := range blockGaps {
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for num := gap.FirstMissing; num <= gap.LastMissing; num++ {
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ch <- num
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}
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}
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close(ch)
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wg.Wait()
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}
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