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resolve_block_status.go
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resolve_block_status.go
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package consensusstatemanager
import (
"fmt"
"github.com/Nexellia-Network/nexelliad/util/staging"
"github.com/Nexellia-Network/nexelliad/domain/consensus/model"
"github.com/Nexellia-Network/nexelliad/domain/consensus/model/externalapi"
"github.com/Nexellia-Network/nexelliad/domain/consensus/ruleerrors"
"github.com/Nexellia-Network/nexelliad/infrastructure/logger"
"github.com/pkg/errors"
)
func (csm *consensusStateManager) resolveBlockStatus(stagingArea *model.StagingArea, blockHash *externalapi.DomainHash,
useSeparateStagingAreaPerBlock bool) (externalapi.BlockStatus, *model.UTXODiffReversalData, error) {
onEnd := logger.LogAndMeasureExecutionTime(log, fmt.Sprintf("resolveBlockStatus for %s", blockHash))
defer onEnd()
log.Debugf("Getting a list of all blocks in the selected "+
"parent chain of %s that have no yet resolved their status", blockHash)
unverifiedBlocks, err := csm.getUnverifiedChainBlocks(stagingArea, blockHash)
if err != nil {
return 0, nil, err
}
log.Debugf("Got %d unverified blocks in the selected parent "+
"chain of %s: %s", len(unverifiedBlocks), blockHash, unverifiedBlocks)
// If there's no unverified blocks in the given block's chain - this means the given block already has a
// UTXO-verified status, and therefore it should be retrieved from the store and returned
if len(unverifiedBlocks) == 0 {
log.Debugf("There are not unverified blocks in %s's selected parent chain. "+
"This means that the block already has a UTXO-verified status.", blockHash)
status, err := csm.blockStatusStore.Get(csm.databaseContext, stagingArea, blockHash)
if err != nil {
return 0, nil, err
}
log.Debugf("Block %s's status resolved to: %s", blockHash, status)
return status, nil, nil
}
log.Debugf("Finding the status of the selected parent of %s", blockHash)
selectedParentHash, selectedParentStatus, selectedParentUTXOSet, err := csm.selectedParentInfo(stagingArea, unverifiedBlocks)
if err != nil {
return 0, nil, err
}
log.Debugf("The status of the selected parent of %s is: %s", blockHash, selectedParentStatus)
log.Debugf("Resolving the unverified blocks' status in reverse order (past to present)")
var blockStatus externalapi.BlockStatus
previousBlockHash := selectedParentHash
previousBlockUTXOSet := selectedParentUTXOSet
var oneBeforeLastResolvedBlockUTXOSet externalapi.UTXODiff
var oneBeforeLastResolvedBlockHash *externalapi.DomainHash
for i := len(unverifiedBlocks) - 1; i >= 0; i-- {
unverifiedBlockHash := unverifiedBlocks[i]
stagingAreaForCurrentBlock := stagingArea
isResolveTip := i == 0
useSeparateStagingArea := useSeparateStagingAreaPerBlock && !isResolveTip
if useSeparateStagingArea {
stagingAreaForCurrentBlock = model.NewStagingArea()
}
if selectedParentStatus == externalapi.StatusDisqualifiedFromChain {
blockStatus = externalapi.StatusDisqualifiedFromChain
} else {
oneBeforeLastResolvedBlockUTXOSet = previousBlockUTXOSet
oneBeforeLastResolvedBlockHash = previousBlockHash
blockStatus, previousBlockUTXOSet, err = csm.resolveSingleBlockStatus(
stagingAreaForCurrentBlock, unverifiedBlockHash, previousBlockHash, previousBlockUTXOSet, isResolveTip)
if err != nil {
return 0, nil, err
}
}
csm.blockStatusStore.Stage(stagingAreaForCurrentBlock, unverifiedBlockHash, blockStatus)
selectedParentStatus = blockStatus
log.Debugf("Block %s status resolved to `%s`, finished %d/%d of unverified blocks",
unverifiedBlockHash, blockStatus, len(unverifiedBlocks)-i, len(unverifiedBlocks))
if useSeparateStagingArea {
err := staging.CommitAllChanges(csm.databaseContext, stagingAreaForCurrentBlock)
if err != nil {
return 0, nil, err
}
}
previousBlockHash = unverifiedBlockHash
}
var reversalData *model.UTXODiffReversalData
if blockStatus == externalapi.StatusUTXOValid && len(unverifiedBlocks) > 1 {
log.Debugf("Preparing data for reversing the UTXODiff")
// During resolveSingleBlockStatus, all unverifiedBlocks (excluding the tip) were assigned their selectedParent
// as their UTXODiffChild.
// Now that the whole chain has been resolved - we can reverse the UTXODiffs, to create shorter UTXODiffChild paths.
// However, we can't do this right now, because the tip of the chain is not yet committed, so we prepare the
// needed data (tip's selectedParent and selectedParent's UTXODiff)
selectedParentUTXODiff, err := previousBlockUTXOSet.DiffFrom(oneBeforeLastResolvedBlockUTXOSet)
if err != nil {
return 0, nil, err
}
reversalData = &model.UTXODiffReversalData{
SelectedParentHash: oneBeforeLastResolvedBlockHash,
SelectedParentUTXODiff: selectedParentUTXODiff,
}
}
return blockStatus, reversalData, nil
}
// selectedParentInfo returns the hash and status of the selectedParent of the last block in the unverifiedBlocks
// chain, in addition, if the status is UTXOValid, it return it's pastUTXOSet
func (csm *consensusStateManager) selectedParentInfo(
stagingArea *model.StagingArea, unverifiedBlocks []*externalapi.DomainHash) (
*externalapi.DomainHash, externalapi.BlockStatus, externalapi.UTXODiff, error) {
log.Tracef("findSelectedParentStatus start")
defer log.Tracef("findSelectedParentStatus end")
lastUnverifiedBlock := unverifiedBlocks[len(unverifiedBlocks)-1]
if lastUnverifiedBlock.Equal(csm.genesisHash) {
log.Debugf("the most recent unverified block is the genesis block, "+
"which by definition has status: %s", externalapi.StatusUTXOValid)
utxoDiff, err := csm.utxoDiffStore.UTXODiff(csm.databaseContext, stagingArea, lastUnverifiedBlock)
if err != nil {
return nil, 0, nil, err
}
return lastUnverifiedBlock, externalapi.StatusUTXOValid, utxoDiff, nil
}
lastUnverifiedBlockGHOSTDAGData, err := csm.ghostdagDataStore.Get(csm.databaseContext, stagingArea, lastUnverifiedBlock, false)
if err != nil {
return nil, 0, nil, err
}
selectedParent := lastUnverifiedBlockGHOSTDAGData.SelectedParent()
selectedParentStatus, err := csm.blockStatusStore.Get(csm.databaseContext, stagingArea, selectedParent)
if err != nil {
return nil, 0, nil, err
}
if selectedParentStatus != externalapi.StatusUTXOValid {
return selectedParent, selectedParentStatus, nil, nil
}
selectedParentUTXOSet, err := csm.restorePastUTXO(stagingArea, selectedParent)
if err != nil {
return nil, 0, nil, err
}
return selectedParent, selectedParentStatus, selectedParentUTXOSet, nil
}
func (csm *consensusStateManager) getUnverifiedChainBlocks(stagingArea *model.StagingArea,
blockHash *externalapi.DomainHash) ([]*externalapi.DomainHash, error) {
log.Tracef("getUnverifiedChainBlocks start for block %s", blockHash)
defer log.Tracef("getUnverifiedChainBlocks end for block %s", blockHash)
var unverifiedBlocks []*externalapi.DomainHash
currentHash := blockHash
for {
log.Tracef("Getting status for block %s", currentHash)
currentBlockStatus, err := csm.blockStatusStore.Get(csm.databaseContext, stagingArea, currentHash)
if err != nil {
return nil, err
}
if currentBlockStatus != externalapi.StatusUTXOPendingVerification {
log.Tracef("Block %s has status %s. Returning all the "+
"unverified blocks prior to it: %s", currentHash, currentBlockStatus, unverifiedBlocks)
return unverifiedBlocks, nil
}
log.Tracef("Block %s is unverified. Adding it to the unverified block collection", currentHash)
unverifiedBlocks = append(unverifiedBlocks, currentHash)
currentBlockGHOSTDAGData, err := csm.ghostdagDataStore.Get(csm.databaseContext, stagingArea, currentHash, false)
if err != nil {
return nil, err
}
if currentBlockGHOSTDAGData.SelectedParent() == nil {
log.Tracef("Genesis block reached. Returning all the "+
"unverified blocks prior to it: %s", unverifiedBlocks)
return unverifiedBlocks, nil
}
currentHash = currentBlockGHOSTDAGData.SelectedParent()
}
}
func (csm *consensusStateManager) resolveSingleBlockStatus(stagingArea *model.StagingArea,
blockHash, selectedParentHash *externalapi.DomainHash, selectedParentPastUTXOSet externalapi.UTXODiff, isResolveTip bool) (
externalapi.BlockStatus, externalapi.UTXODiff, error) {
onEnd := logger.LogAndMeasureExecutionTime(log, fmt.Sprintf("resolveSingleBlockStatus for %s", blockHash))
defer onEnd()
log.Tracef("Calculating pastUTXO and acceptance data and multiset for block %s", blockHash)
pastUTXOSet, acceptanceData, multiset, err := csm.calculatePastUTXOAndAcceptanceDataWithSelectedParentUTXO(
stagingArea, blockHash, selectedParentPastUTXOSet)
if err != nil {
return 0, nil, err
}
log.Tracef("Staging the calculated acceptance data of block %s", blockHash)
csm.acceptanceDataStore.Stage(stagingArea, blockHash, acceptanceData)
block, err := csm.blockStore.Block(csm.databaseContext, stagingArea, blockHash)
if err != nil {
return 0, nil, err
}
log.Tracef("verifying the UTXO of block %s", blockHash)
err = csm.verifyUTXO(stagingArea, block, blockHash, pastUTXOSet, acceptanceData, multiset)
if err != nil {
if errors.As(err, &ruleerrors.RuleError{}) {
log.Debugf("UTXO verification for block %s failed: %s", blockHash, err)
return externalapi.StatusDisqualifiedFromChain, nil, nil
}
return 0, nil, err
}
log.Debugf("UTXO verification for block %s passed", blockHash)
log.Tracef("Staging the multiset of block %s", blockHash)
csm.multisetStore.Stage(stagingArea, blockHash, multiset)
if csm.genesisHash.Equal(blockHash) {
log.Tracef("Staging the utxoDiff of genesis")
csm.stageDiff(stagingArea, blockHash, pastUTXOSet, nil)
return externalapi.StatusUTXOValid, nil, nil
}
oldSelectedTip, err := csm.virtualSelectedParent(stagingArea)
if err != nil {
return 0, nil, err
}
if isResolveTip {
oldSelectedTipUTXOSet, err := csm.restorePastUTXO(stagingArea, oldSelectedTip)
if err != nil {
return 0, nil, err
}
isNewSelectedTip, err := csm.isNewSelectedTip(stagingArea, blockHash, oldSelectedTip)
if err != nil {
return 0, nil, err
}
if isNewSelectedTip {
log.Debugf("Block %s is the new selected tip, therefore setting it as old selected tip's diffChild", blockHash)
updatedOldSelectedTipUTXOSet, err := pastUTXOSet.DiffFrom(oldSelectedTipUTXOSet)
if err != nil {
return 0, nil, err
}
log.Debugf("Setting the old selected tip's (%s) diffChild to be the new selected tip (%s)",
oldSelectedTip, blockHash)
csm.stageDiff(stagingArea, oldSelectedTip, updatedOldSelectedTipUTXOSet, blockHash)
log.Tracef("Staging the utxoDiff of block %s, with virtual as diffChild", blockHash)
csm.stageDiff(stagingArea, blockHash, pastUTXOSet, nil)
} else {
log.Debugf("Block %s is the tip of currently resolved chain, but not the new selected tip,"+
"therefore setting it's utxoDiffChild to be the current selectedTip %s", blockHash, oldSelectedTip)
utxoDiff, err := oldSelectedTipUTXOSet.DiffFrom(pastUTXOSet)
if err != nil {
return 0, nil, err
}
csm.stageDiff(stagingArea, blockHash, utxoDiff, oldSelectedTip)
}
} else {
// If the block is not the tip of the currently resolved chain, we set it's diffChild to be the selectedParent,
// this is a temporary measure to ensure there's a restore path to all blocks at all times.
// Later down the process, the diff will be reversed in reverseUTXODiffs.
log.Debugf("Block %s is not the new selected tip, and is not the tip of the currently verified chain, "+
"therefore temporarily setting selectedParent as it's diffChild", blockHash)
utxoDiff, err := selectedParentPastUTXOSet.DiffFrom(pastUTXOSet)
if err != nil {
return 0, nil, err
}
csm.stageDiff(stagingArea, blockHash, utxoDiff, selectedParentHash)
}
return externalapi.StatusUTXOValid, pastUTXOSet, nil
}
func (csm *consensusStateManager) isNewSelectedTip(stagingArea *model.StagingArea,
blockHash, oldSelectedTip *externalapi.DomainHash) (bool, error) {
newSelectedTip, err := csm.ghostdagManager.ChooseSelectedParent(stagingArea, blockHash, oldSelectedTip)
if err != nil {
return false, err
}
return blockHash.Equal(newSelectedTip), nil
}
func (csm *consensusStateManager) virtualSelectedParent(stagingArea *model.StagingArea) (*externalapi.DomainHash, error) {
virtualGHOSTDAGData, err := csm.ghostdagDataStore.Get(csm.databaseContext, stagingArea, model.VirtualBlockHash, false)
if err != nil {
return nil, err
}
return virtualGHOSTDAGData.SelectedParent(), nil
}