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index: Use first block from locator instead of looking for fork point

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The index sync code has logic to go back the chain to the forking point, while
also updating index-specific state, which is necessary to prevent
possible corruption of the coinstatsindex.

Also add a test for this (a reorg happens while the index is deactivated)
that would not pass before this change.
This commit is contained in:
Martin Zumsande
2022-05-22 20:29:45 +02:00
parent 594f05db19
commit 60bec3c82d
2 changed files with 31 additions and 1 deletions
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8
src/index/base.cpp
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@@ -92,7 +92,13 @@ bool BaseIndex::Init()
if (locator.IsNull()) {
SetBestBlockIndex(nullptr);
} else {
SetBestBlockIndex(m_chainstate->FindForkInGlobalIndex(locator));
// Setting the best block to the locator's top block. If it is not part of the
// best chain, we will rewind to the fork point during index sync
const CBlockIndex* locator_index{m_chainstate->m_blockman.LookupBlockIndex(locator.vHave.at(0))};
if (!locator_index) {
return InitError(strprintf(Untranslated("%s: best block of the index not found. Please rebuild the index."), GetName()));
}
SetBestBlockIndex(locator_index);
}
// Note: this will latch to true immediately if the user starts up with an empty