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pallet-mmr: fix offchain db for sync from zero #12498
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acatangiu
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A0-please_review
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@andresilva @svyatonik @serban300 @Lederstrumpf please prioritize reviewing this PR as it fixes a not-yet released |
serban300
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serban300
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Oct 17, 2022
…nt_hash)` Do this so that both canon and fork-resitant keys have the same `(prefix, pos).encode()` prefix. Might be useful in the future if we'd be able to to "get" offchain db entries using key prefixes as well. Signed-off-by: acatangiu <[email protected]>
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Feb 27, 2023
* pallet-mmr: cosmetic improvements * pallet-mmr: fix offchain storage for initial sync * address review comments * pallet-mmr: change offchain fork-resistant key to `(prefix, pos, parent_hash)` Do this so that both canon and fork-resitant keys have the same `(prefix, pos).encode()` prefix. Might be useful in the future if we'd be able to to "get" offchain db entries using key prefixes as well. Signed-off-by: acatangiu <[email protected]> Signed-off-by: acatangiu <[email protected]>
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MMR nodes are saved in off-chain db under fork-resistant keys based on
frame_system::block_hash(), as such only nodes added by latestframe_system::BlockHashCountcan be accessed that way.Nodes added by blocks older than
frame_system::BlockHashCountare moved byoffchain_workerto "canon" (not fork resistant) location - thus being made available regardless of age.See #11594 for more details.
Issue is that
offchain_workerdoesn't run for blocks imported during initial sync. So for initial syncs >frame_system::BlockHashCount(practically any node syncing from scratch), MMR nodes aren't moved to canon position and access to them is lost.Solution proposed by this PR: runtime block execution saves node to both fork-resistant and canon locations:
offchain_index::set()because it will be overwritten byoffchain_workerwith canon values anyway.