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anticone.go
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anticone.go
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package dagtraversalmanager
import (
"github.com/catspa3/catspad/domain/consensus/model"
"github.com/catspa3/catspad/domain/consensus/model/externalapi"
"github.com/catspa3/catspad/domain/consensus/utils/hashset"
"github.com/pkg/errors"
)
func (dtm *dagTraversalManager) AnticoneFromVirtualPOV(stagingArea *model.StagingArea, blockHash *externalapi.DomainHash) (
[]*externalapi.DomainHash, error) {
virtualParents, err := dtm.dagTopologyManager.Parents(stagingArea, model.VirtualBlockHash)
if err != nil {
return nil, err
}
return dtm.AnticoneFromBlocks(stagingArea, virtualParents, blockHash, 0)
}
func (dtm *dagTraversalManager) AnticoneFromBlocks(stagingArea *model.StagingArea, tips []*externalapi.DomainHash,
blockHash *externalapi.DomainHash, maxTraversalAllowed uint64) (
[]*externalapi.DomainHash, error) {
anticone := []*externalapi.DomainHash{}
queue := tips
visited := hashset.New()
traversalCounter := uint64(0)
for len(queue) > 0 {
var current *externalapi.DomainHash
current, queue = queue[0], queue[1:]
if visited.Contains(current) {
continue
}
visited.Add(current)
currentIsAncestorOfBlock, err := dtm.dagTopologyManager.IsAncestorOf(stagingArea, current, blockHash)
if err != nil {
return nil, err
}
if currentIsAncestorOfBlock {
continue
}
blockIsAncestorOfCurrent, err := dtm.dagTopologyManager.IsAncestorOf(stagingArea, blockHash, current)
if err != nil {
return nil, err
}
// We count the number of blocks in past(tips) \setminus past(blockHash).
// We don't use `len(visited)` since it includes some maximal blocks in past(blockHash) as well.
traversalCounter++
if maxTraversalAllowed > 0 && traversalCounter > maxTraversalAllowed {
return nil, errors.Wrapf(model.ErrReachedMaxTraversalAllowed,
"Passed max allowed traversal (%d > %d)", traversalCounter, maxTraversalAllowed)
}
if !blockIsAncestorOfCurrent {
anticone = append(anticone, current)
}
currentParents, err := dtm.dagTopologyManager.Parents(stagingArea, current)
if err != nil {
return nil, err
}
for _, parent := range currentParents {
queue = append(queue, parent)
}
}
return anticone, nil
}