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core: optimize HasBlock check for recent blocks

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When block is being spread through the network we can get a lot of invs with
the same hash. Some more stale nodes may also announce previous or some
earlier block. We can avoid full DB lookup for them and minimize inv handling
time (timeouts in inv handler had happened in #2744).

It doesn't affect tests, just makes node a little less likely to spend some
considerable amount of time in the inv handler.
This commit is contained in:
Roman Khimov 2022-10-19 13:02:27 +03:00
parent bf4636f70a
commit 0c3b03617e
1 changed files with 10 additions and 0 deletions
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10
pkg/core/blockchain.go
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@ -1714,6 +1714,16 @@ func (bc *Blockchain) HasTransaction(hash util.Uint256) bool {
// HasBlock returns true if the blockchain contains the given
// block hash.
func (bc *Blockchain) HasBlock(hash util.Uint256) bool {
var height = bc.BlockHeight()
bc.headerHashesLock.RLock()
for i := int(height); i >= int(height)-4 && i >= 0; i-- {
if hash.Equals(bc.headerHashes[i]) {
bc.headerHashesLock.RUnlock()
return true
}
}
bc.headerHashesLock.RUnlock()
if header, err := bc.GetHeader(hash); err == nil {
return header.Index <= bc.BlockHeight()
}