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core: reset tx lookup cache if necessary #28865

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Jan 30, 2024
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14 changes: 11 additions & 3 deletions core/blockchain.go
Original file line number Diff line number Diff line change
Expand Up @@ -2188,6 +2188,12 @@ func (bc *BlockChain) reorg(oldHead *types.Header, newHead *types.Block) error {
// rewind the canonical chain to a lower point.
log.Error("Impossible reorg, please file an issue", "oldnum", oldBlock.Number(), "oldhash", oldBlock.Hash(), "oldblocks", len(oldChain), "newnum", newBlock.Number(), "newhash", newBlock.Hash(), "newblocks", len(newChain))
}
// Reset the tx lookup cache in case to clear stale txlookups.
// This is done before writing any new chain data to avoid the
// weird scenario that canonical chain is changed while the
// stale lookups are still cached.
bc.txLookupCache.Purge()

// Insert the new chain(except the head block(reverse order)),
// taking care of the proper incremental order.
for i := len(newChain) - 1; i >= 1; i-- {
Expand All @@ -2202,11 +2208,13 @@ func (bc *BlockChain) reorg(oldHead *types.Header, newHead *types.Block) error {

// Delete useless indexes right now which includes the non-canonical
// transaction indexes, canonical chain indexes which above the head.
indexesBatch := bc.db.NewBatch()
for _, tx := range types.HashDifference(deletedTxs, addedTxs) {
var (
indexesBatch = bc.db.NewBatch()
diffs = types.HashDifference(deletedTxs, addedTxs)
)
for _, tx := range diffs {
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If we're going to purge before writing canonical chain, can we revert this chunk?

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They are equal, i am just too lazy to wait another round of CI. I think it should be fine.

rawdb.DeleteTxLookupEntry(indexesBatch, tx)
}

// Delete all hash markers that are not part of the new canonical chain.
// Because the reorg function does not handle new chain head, all hash
// markers greater than or equal to new chain head should be deleted.
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