Skip to content

Commit

Permalink
fix: get shuffling decision block at genesis state
Browse files Browse the repository at this point in the history
  • Loading branch information
twoeths committed Nov 9, 2023
1 parent e1fafb4 commit 29be86f
Showing 1 changed file with 16 additions and 2 deletions.
18 changes: 16 additions & 2 deletions packages/beacon-node/src/chain/shufflingCache.ts
Original file line number Diff line number Diff line change
@@ -1,7 +1,10 @@
import {toHexString} from "@chainsafe/ssz";
import {CachedBeaconStateAllForks, EpochShuffling, getShufflingDecisionBlock} from "@lodestar/state-transition";
import {Epoch, RootHex} from "@lodestar/types";
import {Epoch, RootHex, ssz} from "@lodestar/types";
import {MapDef, pruneSetToMax} from "@lodestar/utils";
import {GENESIS_SLOT} from "@lodestar/params";
import {Metrics} from "../metrics/metrics.js";
import {computeAnchorCheckpoint} from "./initState.js";

/**
* Same value to CheckpointBalancesCache, with the assumption that we don't have to use it for old epochs. In the worse case:
Expand Down Expand Up @@ -72,7 +75,7 @@ export class ShufflingCache {
* Extract shuffling from state and add to cache
*/
processState(state: CachedBeaconStateAllForks, shufflingEpoch: Epoch): EpochShuffling {
const decisionBlockHex = getShufflingDecisionBlock(state, shufflingEpoch);
const decisionBlockHex = getDecisionBlock(state, shufflingEpoch);
let shuffling: EpochShuffling;
switch (shufflingEpoch) {
case state.epochCtx.nextShuffling.epoch:
Expand Down Expand Up @@ -178,3 +181,14 @@ function isShufflingCacheItem(item: CacheItem): item is ShufflingCacheItem {
function isPromiseCacheItem(item: CacheItem): item is PromiseCacheItem {
return item.type === CacheItemType.promise;
}

/**
* Get the shuffling decision block root for the given epoch of given state
* - Special case close to genesis block, return the genesis block root
* - This is similar to forkchoice.getDependentRoot() function, otherwise we cannot get cached shuffing in attestation verification when syncing from genesis.
*/
function getDecisionBlock(state: CachedBeaconStateAllForks, epoch: Epoch): RootHex {
return state.slot > GENESIS_SLOT
? getShufflingDecisionBlock(state, epoch)
: toHexString(ssz.phase0.BeaconBlockHeader.hashTreeRoot(computeAnchorCheckpoint(state.config, state).blockHeader));
}

0 comments on commit 29be86f

Please sign in to comment.