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authorFelföldi Zsolt <zsfelfoldi@gmail.com>2018-06-12 21:52:54 +0800
committerPéter Szilágyi <peterke@gmail.com>2018-06-12 21:52:54 +0800
commit049f5b357200406c01f7bf2d2e2936d1d28a319b (patch)
treeef73043730c3d77359b9163ab6cbb2f053e5cf86 /light
parent0255951587ef0eada5d162f3404bc481f70a2ce2 (diff)
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core, eth, les: more efficient hash-based header chain retrieval (#16946)
Diffstat (limited to 'light')
-rw-r--r--light/lightchain.go12
1 files changed, 12 insertions, 0 deletions
diff --git a/light/lightchain.go b/light/lightchain.go
index 9d0a4e4f7..30b9bd89a 100644
--- a/light/lightchain.go
+++ b/light/lightchain.go
@@ -433,6 +433,18 @@ func (self *LightChain) GetBlockHashesFromHash(hash common.Hash, max uint64) []c
return self.hc.GetBlockHashesFromHash(hash, max)
}
+// GetAncestor retrieves the Nth ancestor of a given block. It assumes that either the given block or
+// a close ancestor of it is canonical. maxNonCanonical points to a downwards counter limiting the
+// number of blocks to be individually checked before we reach the canonical chain.
+//
+// Note: ancestor == 0 returns the same block, 1 returns its parent and so on.
+func (bc *LightChain) GetAncestor(hash common.Hash, number, ancestor uint64, maxNonCanonical *uint64) (common.Hash, uint64) {
+ bc.chainmu.Lock()
+ defer bc.chainmu.Unlock()
+
+ return bc.hc.GetAncestor(hash, number, ancestor, maxNonCanonical)
+}
+
// GetHeaderByNumber retrieves a block header from the database by number,
// caching it (associated with its hash) if found.
func (self *LightChain) GetHeaderByNumber(number uint64) *types.Header {