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[NOD-143] SelectedAncestor now returns the first chain block under height if there's no chain block with exact hight

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This commit is contained in:
Mike Zak 2019-04-28 11:53:48 +03:00
parent 77fae7b522
commit ed76e2c962
1 changed files with 4 additions and 1 deletions
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5
blockdag/blocknode.go
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@ -198,6 +198,9 @@ func (node *blockNode) Header() *wire.BlockHeader {
// the selected chain backwards from this node. The returned block will be nil when a
// height is requested that is after the height of the passed node or is less than zero.
//
// When there's no chain-block of the requested height, the block with the highest height
// that is lower than requested height would be returned.
//
// This function is safe for concurrent access.
func (node *blockNode) SelectedAncestor(height int32) *blockNode {
if height < 0 || height > node.height {
@ -205,7 +208,7 @@ func (node *blockNode) SelectedAncestor(height int32) *blockNode {
}
n := node
for ; n != nil && n.height != height; n = n.selectedParent {
for ; n != nil && n.height > height; n = n.selectedParent {
// Intentionally left blank
}