1106 lines
44 KiB
Nim
1106 lines
44 KiB
Nim
# beacon_chain
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# Copyright (c) 2022-2024 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [].}
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import
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# Status libraries
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stew/bitops2,
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# Beacon chain internals
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../spec/forks,
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../beacon_chain_db_light_client,
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"."/[block_pools_types, blockchain_dag]
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logScope: topics = "chaindag_lc"
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template nextEpochBoundarySlot(slot: Slot): Slot =
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## Compute the first possible epoch boundary state slot of a `Checkpoint`
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## referring to a block at given slot.
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(slot + (SLOTS_PER_EPOCH - 1)).epoch.start_slot
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proc updateExistingState(
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dag: ChainDAGRef, state: var ForkedHashedBeaconState, bsi: BlockSlotId,
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save: bool, cache: var StateCache): bool =
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## Wrapper around `updateState` for states expected to exist.
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let ok = dag.updateState(state, bsi, save, cache)
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if not ok:
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error "State failed to load unexpectedly", bsi, tail = dag.tail.slot
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doAssert strictVerification notin dag.updateFlags
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ok
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template withUpdatedExistingState(
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dag: ChainDAGRef, stateParam: var ForkedHashedBeaconState,
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bsiParam: BlockSlotId, okBody: untyped, failureBody: untyped): untyped =
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## Wrapper around `withUpdatedState` for states expected to exist.
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block:
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let bsi = bsiParam
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dag.withUpdatedState(stateParam, bsiParam) do:
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okBody
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do:
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error "State failed to load unexpectedly", bsi, tail = dag.tail.slot
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doAssert strictVerification notin dag.updateFlags
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failureBody
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proc getExistingBlockIdAtSlot(dag: ChainDAGRef, slot: Slot): Opt[BlockSlotId] =
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## Wrapper around `getBlockIdAtSlot` for blocks expected to exist.
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let bsi = dag.getBlockIdAtSlot(slot)
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if bsi.isNone:
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error "Block failed to load unexpectedly", slot, tail = dag.tail.slot
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doAssert strictVerification notin dag.updateFlags
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bsi
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proc existingParent(dag: ChainDAGRef, bid: BlockId): Opt[BlockId] =
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## Wrapper around `parent` for parents known to exist.
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let parent = dag.parent(bid)
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if parent.isNone:
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error "Parent failed to load unexpectedly", bid, tail = dag.tail.slot
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doAssert strictVerification notin dag.updateFlags
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parent
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proc getExistingForkedBlock(
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dag: ChainDAGRef, bid: BlockId): Opt[ForkedTrustedSignedBeaconBlock] =
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## Wrapper around `getForkedBlock` for blocks expected to exist.
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let bdata = dag.getForkedBlock(bid)
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if bdata.isNone:
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error "Block failed to load unexpectedly", bid, tail = dag.tail.slot
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doAssert strictVerification notin dag.updateFlags
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bdata
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proc existingCurrentSyncCommitteeForPeriod(
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dag: ChainDAGRef,
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tmpState: var ForkedHashedBeaconState,
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period: SyncCommitteePeriod): Opt[SyncCommittee] =
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## Wrapper around `currentSyncCommitteeForPeriod` for states known to exist.
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let syncCommittee = dag.currentSyncCommitteeForPeriod(tmpState, period)
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if syncCommittee.isNone:
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error "Current sync committee failed to load unexpectedly",
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period, tail = dag.tail.slot
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doAssert strictVerification notin dag.updateFlags
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syncCommittee
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func pruneToCapacity[A, B](t: var OrderedTable[A, B], capacity: int) =
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while t.len > capacity:
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var key {.noinit.}: A
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for k in t.keys:
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key = k
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break
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t.del(key)
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func cacheRecentLightClientHeader(
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dag: ChainDAGRef, bid: BlockId, header: ForkedLightClientHeader) =
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dag.lcDataStore.cache.recentHeaders[bid] = header
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dag.lcDataStore.cache.recentHeaders.pruneToCapacity(10)
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func cacheRecentSyncAggregate(
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dag: ChainDAGRef, bid: BlockId, syncAggregate: SyncAggregate) =
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dag.lcDataStore.cache.recentSyncAggregates[bid] = syncAggregate
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dag.lcDataStore.cache.recentSyncAggregates.pruneToCapacity(5)
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func lightClientHeader(
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blck: ForkyTrustedSignedBeaconBlock): ForkedLightClientHeader =
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const lcDataFork = max(
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lcDataForkAtConsensusFork(typeof(blck).kind), LightClientDataFork.Altair)
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ForkedLightClientHeader.init(blck.toLightClientHeader(lcDataFork))
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func syncAggregate(
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blck: ForkyTrustedSignedBeaconBlock): SyncAggregate =
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blck.asSigned().message.body.sync_aggregate
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proc getExistingLightClientHeader(
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dag: ChainDAGRef, bid: BlockId): ForkedLightClientHeader =
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var res = dag.lcDataStore.cache.recentHeaders.getOrDefault(bid)
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if res.kind > LightClientDataFork.None:
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return res
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let bdata = dag.getExistingForkedBlock(bid)
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if bdata.isNone:
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return res
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res = withBlck(bdata.get): forkyBlck.lightClientHeader()
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dag.cacheRecentLightClientHeader(bid, res)
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res
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proc getExistingSyncAggregate(
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dag: ChainDAGRef, bid: BlockId): Opt[SyncAggregate] =
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if bid in dag.lcDataStore.cache.recentSyncAggregates:
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return Opt.some dag.lcDataStore.cache.recentSyncAggregates.getOrDefault(bid)
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let bdata = dag.getExistingForkedBlock(bid)
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if bdata.isNone:
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return Opt.none(SyncAggregate)
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let res = withBlck(bdata.get):
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when consensusFork >= ConsensusFork.Altair:
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Opt.some forkyBlck.syncAggregate()
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else:
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return Opt.none(SyncAggregate)
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dag.cacheRecentSyncAggregate(bid, res.get)
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res
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proc initLightClientDataStore*(
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config: LightClientDataConfig,
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cfg: RuntimeConfig,
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db: LightClientDataDB): LightClientDataStore =
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## Initialize light client data store.
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let
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defaultMaxPeriods = cfg.defaultLightClientDataMaxPeriods
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maxPeriods = config.maxPeriods.get(distinctBase(SyncCommitteePeriod.high))
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if maxPeriods < defaultMaxPeriods:
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warn "Retaining fewer periods than recommended",
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lightClientDataMaxPeriods = config.maxPeriods,
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specRecommendation = defaultMaxPeriods
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LightClientDataStore(
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db: db,
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serve: config.serve,
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importMode: config.importMode,
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maxPeriods: maxPeriods,
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onLightClientFinalityUpdate: config.onLightClientFinalityUpdate,
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onLightClientOptimisticUpdate: config.onLightClientOptimisticUpdate)
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func targetLightClientTailSlot(dag: ChainDAGRef): Slot =
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## Earliest slot for which light client data is retained.
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let
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maxPeriods = dag.lcDataStore.maxPeriods
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headPeriod = dag.head.slot.sync_committee_period
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lowSlot = dag.cfg.ALTAIR_FORK_EPOCH.start_slot
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tail = max(headPeriod + 1, maxPeriods.SyncCommitteePeriod) - maxPeriods
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max(tail.start_slot, lowSlot)
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func handleUnexpectedLightClientError(dag: ChainDAGRef, buggedSlot: Slot) =
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## If there is an unexpected error, adjust `tailSlot` to keep track of the
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## section for which complete light client data is available, and to avoid
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## failed lookups of cached light client data.
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doAssert strictVerification notin dag.updateFlags
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if buggedSlot >= dag.lcDataStore.cache.tailSlot:
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dag.lcDataStore.cache.tailSlot = buggedSlot + 1
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proc initLightClientBootstrapForPeriod(
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dag: ChainDAGRef,
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period: SyncCommitteePeriod): Opt[void] =
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## Compute and cache `LightClientBootstrap` data for all finalized
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## epoch boundary blocks within a given sync committee period.
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if dag.finalizedHead.slot < period.start_slot:
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return ok()
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if dag.finalizedHead.slot < dag.cfg.ALTAIR_FORK_EPOCH.start_slot:
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return ok()
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if dag.lcDataStore.db.isPeriodSealed(period):
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return ok()
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let startTick = Moment.now()
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debug "Caching historic LC bootstrap data", period
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defer:
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let endTick = Moment.now()
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debug "Historic LC bootstrap data cached", period,
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cacheDur = endTick - startTick
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let
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periodStartSlot = period.start_slot
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periodEndSlot = periodStartSlot + SLOTS_PER_SYNC_COMMITTEE_PERIOD - 1
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tailSlot = max(dag.targetLightClientTailSlot, dag.tail.slot)
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lowSlot = max(periodStartSlot, tailSlot)
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highSlot = min(periodEndSlot, dag.finalizedHead.blck.slot)
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lowBoundarySlot = lowSlot.nextEpochBoundarySlot
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highBoundarySlot = highSlot.nextEpochBoundarySlot
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var
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res = ok()
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tmpState = assignClone(dag.headState)
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tmpCache: StateCache
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nextBoundarySlot = lowBoundarySlot
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while nextBoundarySlot <= highBoundarySlot:
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defer: nextBoundarySlot += SLOTS_PER_EPOCH
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let
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bsi = dag.getExistingBlockIdAtSlot(nextBoundarySlot).valueOr:
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dag.handleUnexpectedLightClientError(nextBoundarySlot)
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res.err()
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continue
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bid = bsi.bid
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boundarySlot = bid.slot.nextEpochBoundarySlot
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if boundarySlot == nextBoundarySlot and bid.slot >= lowSlot and
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not dag.lcDataStore.db.hasCurrentSyncCommitteeBranch(bid.slot):
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let bdata = dag.getExistingForkedBlock(bid).valueOr:
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dag.handleUnexpectedLightClientError(bid.slot)
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res.err()
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continue
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if not dag.updateExistingState(
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tmpState[], bid.atSlot, save = false, tmpCache):
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dag.handleUnexpectedLightClientError(bid.slot)
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res.err()
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continue
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withStateAndBlck(tmpState[], bdata):
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when consensusFork >= ConsensusFork.Altair:
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const lcDataFork = lcDataForkAtConsensusFork(consensusFork)
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if not dag.lcDataStore.db.hasSyncCommittee(period):
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dag.lcDataStore.db.putSyncCommittee(
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period, forkyState.data.current_sync_committee)
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dag.lcDataStore.db.putHeader(
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forkyBlck.toLightClientHeader(lcDataFork))
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dag.lcDataStore.db.putCurrentSyncCommitteeBranch(
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bid.slot, forkyState.data.build_proof(
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altair.CURRENT_SYNC_COMMITTEE_GINDEX).get)
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else: raiseAssert "Unreachable"
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res
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proc initLightClientUpdateForPeriod(
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dag: ChainDAGRef, period: SyncCommitteePeriod): Opt[void] =
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## Compute and cache the best `LightClientUpdate` within a given
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## sync committee period up through the finalized head block.
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## Non-finalized blocks are processed incrementally by other functions.
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## Should not be called for periods for which incremental computation started.
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if dag.finalizedHead.slot < period.start_slot:
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return ok()
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if dag.finalizedHead.slot < dag.cfg.ALTAIR_FORK_EPOCH.start_slot:
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return ok()
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if dag.lcDataStore.db.isPeriodSealed(period):
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return ok()
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let startTick = Moment.now()
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debug "Computing best historic LC update", period
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proc logBest(endTick = Moment.now()) =
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# Using a helper function reduces code size as the `defer` beneath is
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# replicated on every `return`, and the log statement allocates another
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# copy of the arguments on the stack for each instantiation (~1 MB stack!)
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debug "Best historic LC update computed",
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period, update = dag.lcDataStore.db.getBestUpdate(period),
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computeDur = endTick - startTick
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defer: logBest()
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proc maxParticipantsBlock(
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dag: ChainDAGRef, highBid: BlockId, lowSlot: Slot
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): tuple[bid: Opt[BlockId], res: Opt[void]] =
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## Determine the earliest block with most sync committee signatures among
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## ancestors of `highBid` with at least `lowSlot` as parent block slot.
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## Return `err` if no block with `MIN_SYNC_COMMITTEE_PARTICIPANTS` exists.
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## `res` in result indicates whether no unexpected errors occurred.
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var
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maxParticipants = MIN_SYNC_COMMITTEE_PARTICIPANTS
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maxBid: Opt[BlockId]
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res = Opt[void].ok()
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bid = highBid
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while true:
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if bid.slot <= lowSlot:
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break
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let parentBid = dag.existingParent(bid).valueOr:
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dag.handleUnexpectedLightClientError(bid.slot)
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res.err()
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break
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if parentBid.slot < lowSlot:
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break
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let
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bdata = dag.getExistingForkedBlock(bid).valueOr:
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dag.handleUnexpectedLightClientError(bid.slot)
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res.err()
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break
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numParticipants =
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withBlck(bdata):
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when consensusFork >= ConsensusFork.Altair:
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forkyBlck.message.body.sync_aggregate.num_active_participants
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else: raiseAssert "Unreachable"
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if numParticipants >= maxParticipants:
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maxParticipants = numParticipants
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maxBid.ok bid
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bid = parentBid
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(bid: maxBid, res: res)
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# Determine the block in the period with highest sync committee participation
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let
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periodStartSlot = period.start_slot
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periodEndSlot = periodStartSlot + SLOTS_PER_SYNC_COMMITTEE_PERIOD - 1
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tailSlot = max(dag.targetLightClientTailSlot, dag.tail.slot)
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lowSlot = max(periodStartSlot, tailSlot)
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highSlot = min(periodEndSlot, dag.finalizedHead.blck.slot)
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highBsi = dag.getExistingBlockIdAtSlot(highSlot).valueOr:
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dag.handleUnexpectedLightClientError(highSlot)
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return err()
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highBid = highBsi.bid
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maxParticipantsRes = dag.maxParticipantsBlock(highBid, lowSlot)
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maxParticipantsBid = maxParticipantsRes.bid.valueOr:
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const update = default(ForkedLightClientUpdate)
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dag.lcDataStore.db.putBestUpdate(period, update)
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return maxParticipantsRes.res
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# The block with highest participation may refer to a `finalized_checkpoint`
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# in a different sync committee period. If that is the case, search for a
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# later block with a `finalized_checkpoint` within the given sync committee
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# period, despite it having a lower sync committee participation
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var
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res = ok()
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tmpState = assignClone(dag.headState)
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signatureBid {.noinit.}, finalizedBid {.noinit.}: BlockId
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signatureBid.slot = FAR_FUTURE_SLOT
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finalizedBid.slot = FAR_FUTURE_SLOT
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while true:
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if signatureBid.slot == FAR_FUTURE_SLOT:
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signatureBid = maxParticipantsBid
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else:
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let signatureRes = dag.maxParticipantsBlock(highBid, signatureBid.slot)
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if signatureRes.res.isErr:
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res.err()
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signatureBid = signatureRes.bid.valueOr:
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signatureBid = maxParticipantsBid
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break
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let
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attestedBid = dag.existingParent(signatureBid).valueOr:
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dag.handleUnexpectedLightClientError(signatureBid.slot)
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res.err()
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continue
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finalizedEpoch = block:
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dag.withUpdatedExistingState(tmpState[], attestedBid.atSlot) do:
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withState(updatedState):
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when consensusFork >= ConsensusFork.Altair:
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forkyState.data.finalized_checkpoint.epoch
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else: raiseAssert "Unreachable"
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do:
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dag.handleUnexpectedLightClientError(attestedBid.slot)
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res.err()
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continue
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finalizedSlot = finalizedEpoch.start_slot
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finalizedBsi =
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if finalizedSlot >= dag.tail.slot:
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dag.getExistingBlockIdAtSlot(finalizedSlot).valueOr:
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dag.handleUnexpectedLightClientError(finalizedSlot)
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res.err()
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continue
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else:
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continue
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if finalizedBsi.bid.slot >= lowSlot:
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finalizedBid = finalizedBsi.bid
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break
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if signatureBid == maxParticipantsBid:
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finalizedBid = finalizedBsi.bid # For fallback `break` at start of loop
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# Save best light client data for given period
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var update {.noinit.}: ForkedLightClientUpdate
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let attestedBid = dag.existingParent(signatureBid).valueOr:
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dag.handleUnexpectedLightClientError(signatureBid.slot)
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return err()
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dag.withUpdatedExistingState(tmpState[], attestedBid.atSlot) do:
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let bdata = dag.getExistingForkedBlock(bid).valueOr:
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dag.handleUnexpectedLightClientError(bid.slot)
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return err()
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withStateAndBlck(updatedState, bdata):
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when consensusFork >= ConsensusFork.Altair:
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const lcDataFork = lcDataForkAtConsensusFork(consensusFork)
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update = ForkedLightClientUpdate.init(lcDataFork.LightClientUpdate(
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attested_header: forkyBlck.toLightClientHeader(lcDataFork),
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next_sync_committee: forkyState.data.next_sync_committee,
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next_sync_committee_branch:
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forkyState.data.build_proof(altair.NEXT_SYNC_COMMITTEE_GINDEX).get,
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finality_branch:
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if finalizedBid.slot != FAR_FUTURE_SLOT:
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forkyState.data.build_proof(altair.FINALIZED_ROOT_GINDEX).get
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else:
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default(FinalityBranch)))
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else: raiseAssert "Unreachable"
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do:
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dag.handleUnexpectedLightClientError(attestedBid.slot)
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return err()
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if finalizedBid.slot != FAR_FUTURE_SLOT and finalizedBid.slot != GENESIS_SLOT:
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let bdata = dag.getExistingForkedBlock(finalizedBid).valueOr:
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dag.handleUnexpectedLightClientError(finalizedBid.slot)
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return err()
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withBlck(bdata):
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withForkyUpdate(update):
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when lcDataFork > LightClientDataFork.None:
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when lcDataFork >= lcDataForkAtConsensusFork(consensusFork):
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forkyUpdate.finalized_header =
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forkyBlck.toLightClientHeader(lcDataFork)
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else: raiseAssert "Unreachable"
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let bdata = dag.getExistingForkedBlock(signatureBid).valueOr:
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dag.handleUnexpectedLightClientError(signatureBid.slot)
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return err()
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withBlck(bdata):
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when consensusFork >= ConsensusFork.Altair:
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withForkyUpdate(update):
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when lcDataFork > LightClientDataFork.None:
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forkyUpdate.sync_aggregate =
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forkyBlck.asSigned().message.body.sync_aggregate
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else: raiseAssert "Unreachable"
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withForkyUpdate(update):
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when lcDataFork > LightClientDataFork.None:
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forkyUpdate.signature_slot = signatureBid.slot
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dag.lcDataStore.db.putBestUpdate(period, update)
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res
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proc initLightClientDataForPeriod(
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dag: ChainDAGRef, period: SyncCommitteePeriod): Opt[void] =
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## Import light client data for a given sync committee period.
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if dag.lcDataStore.db.isPeriodSealed(period):
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return ok()
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let
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fullPeriodCovered = (dag.finalizedHead.slot >= (period + 1).start_slot)
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res1 = dag.initLightClientBootstrapForPeriod(period)
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res2 = dag.initLightClientUpdateForPeriod(period)
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if res1.isErr or res2.isErr:
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return err()
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if fullPeriodCovered:
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dag.lcDataStore.db.sealPeriod(period)
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ok()
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proc getLightClientData(
|
|
dag: ChainDAGRef,
|
|
bid: BlockId): CachedLightClientData =
|
|
## Fetch cached light client data about a given block.
|
|
## Data must be cached (`cacheLightClientData`) before calling this function.
|
|
try: dag.lcDataStore.cache.data[bid]
|
|
except KeyError: raiseAssert "Unreachable"
|
|
|
|
proc cacheLightClientData(
|
|
dag: ChainDAGRef,
|
|
state: ForkyHashedBeaconState,
|
|
blck: ForkyTrustedSignedBeaconBlock,
|
|
current_period_best_update: ref ForkedLightClientUpdate,
|
|
latest_signature_slot: Slot) =
|
|
## Cache data for a given block and its post-state to speed up creating future
|
|
## `LightClientUpdate` and `LightClientBootstrap` instances that refer to this
|
|
## block and state.
|
|
let
|
|
bid = blck.toBlockId()
|
|
cachedData = CachedLightClientData(
|
|
current_sync_committee_branch:
|
|
state.data.build_proof(altair.CURRENT_SYNC_COMMITTEE_GINDEX).get,
|
|
next_sync_committee_branch:
|
|
state.data.build_proof(altair.NEXT_SYNC_COMMITTEE_GINDEX).get,
|
|
finalized_slot:
|
|
state.data.finalized_checkpoint.epoch.start_slot,
|
|
finality_branch:
|
|
state.data.build_proof(altair.FINALIZED_ROOT_GINDEX).get,
|
|
current_period_best_update:
|
|
current_period_best_update,
|
|
latest_signature_slot:
|
|
latest_signature_slot)
|
|
if dag.lcDataStore.cache.data.hasKeyOrPut(bid, cachedData):
|
|
doAssert false, "Redundant `cacheLightClientData` call"
|
|
dag.cacheRecentLightClientHeader(bid, blck.lightClientHeader())
|
|
dag.cacheRecentSyncAggregate(bid, blck.syncAggregate())
|
|
|
|
func shouldImportLcData(dag: ChainDAGRef): bool =
|
|
dag.lcDataStore.importMode != LightClientDataImportMode.None and
|
|
dag.cfg.ALTAIR_FORK_EPOCH != FAR_FUTURE_EPOCH
|
|
|
|
proc deleteLightClientData*(dag: ChainDAGRef, bid: BlockId) =
|
|
## Delete cached light client data for a given block. This needs to be called
|
|
## when a block becomes unreachable due to finalization of a different fork.
|
|
if not dag.shouldImportLcData:
|
|
return
|
|
|
|
dag.lcDataStore.cache.data.del bid
|
|
|
|
proc assignLightClientData(
|
|
obj: var SomeForkedLightClientUpdateWithFinality,
|
|
dag: ChainDAGRef,
|
|
attested_bid: BlockId,
|
|
signature_slot: Slot,
|
|
sync_aggregate: SyncAggregate,
|
|
next_sync_committee = Opt.none(SyncCommittee)): Opt[void] {.discardable.} =
|
|
## Update `obj` based on `attested_bid` / `signature_slot` / `sync_aggregate`
|
|
## and `next_sync_committee` (for full `LightClientUpdate`).
|
|
## Return `ok` if there were changes; `err` otherwise.
|
|
|
|
# If `sync_aggregate` is unchanged, the rest is also unchanged
|
|
withForkyObject(obj):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
if forkyObject.signature_slot == signature_slot and
|
|
forkyObject.sync_aggregate == sync_aggregate:
|
|
return err()
|
|
|
|
# Bump `attested_header`; if it is unchanged, finality info is also unchanged
|
|
let new_attested_header = withForkyObject(obj):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
template beacon_header: untyped = forkyObject.attested_header.beacon
|
|
beacon_header.slot != attested_bid.slot or
|
|
beacon_header.hash_tree_root() != attested_bid.root
|
|
else:
|
|
true
|
|
if new_attested_header:
|
|
let att_header = dag.getExistingLightClientHeader(attested_bid)
|
|
withForkyHeader(att_header):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
obj.migrateToDataFork(lcDataFork)
|
|
obj.forky(lcDataFork).attested_header = forkyHeader
|
|
else:
|
|
dag.handleUnexpectedLightClientError(attested_bid.slot)
|
|
return err()
|
|
var attested_data = dag.getLightClientData(attested_bid)
|
|
when obj is SomeForkedLightClientUpdateWithSyncCommittee:
|
|
doAssert next_sync_committee.isSome
|
|
withForkyObject(obj):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
forkyObject.next_sync_committee =
|
|
next_sync_committee.get
|
|
forkyObject.next_sync_committee_branch =
|
|
attested_data.next_sync_committee_branch
|
|
else:
|
|
doAssert next_sync_committee.isNone
|
|
var finalized_slot = attested_data.finalized_slot
|
|
withForkyObject(obj):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
if finalized_slot == forkyObject.finalized_header.beacon.slot:
|
|
forkyObject.finality_branch = attested_data.finality_branch
|
|
elif finalized_slot < dag.tail.slot:
|
|
forkyObject.finalized_header.reset()
|
|
forkyObject.finality_branch.reset()
|
|
else:
|
|
let finalized_bsi = dag.getExistingBlockIdAtSlot(finalized_slot)
|
|
if finalized_bsi.isNone:
|
|
dag.handleUnexpectedLightClientError(finalized_slot)
|
|
forkyObject.finalized_header.reset()
|
|
forkyObject.finality_branch.reset()
|
|
else:
|
|
let finalized_bid = finalized_bsi.get.bid
|
|
if finalized_bid.slot != finalized_slot:
|
|
# Empty slots at end of epoch, update cache for latest block slot
|
|
finalized_slot = finalized_bid.slot
|
|
attested_data.finalized_slot = finalized_slot
|
|
dag.lcDataStore.cache.data[attested_bid] = attested_data
|
|
if finalized_slot == forkyObject.finalized_header.beacon.slot:
|
|
forkyObject.finality_branch = attested_data.finality_branch
|
|
elif finalized_slot == GENESIS_SLOT:
|
|
forkyObject.finalized_header.reset()
|
|
forkyObject.finality_branch = attested_data.finality_branch
|
|
else:
|
|
var fin_header = dag.getExistingLightClientHeader(finalized_bid)
|
|
if fin_header.kind == LightClientDataFork.None:
|
|
dag.handleUnexpectedLightClientError(finalized_bid.slot)
|
|
forkyObject.finalized_header.reset()
|
|
forkyObject.finality_branch.reset()
|
|
else:
|
|
fin_header.migrateToDataFork(lcDataFork)
|
|
forkyObject.finalized_header = fin_header.forky(lcDataFork)
|
|
forkyObject.finality_branch = attested_data.finality_branch
|
|
withForkyObject(obj):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
forkyObject.sync_aggregate = sync_aggregate
|
|
forkyObject.signature_slot = signature_slot
|
|
ok()
|
|
|
|
proc createLightClientUpdates(
|
|
dag: ChainDAGRef,
|
|
state: ForkyHashedBeaconState,
|
|
blck: ForkyTrustedSignedBeaconBlock,
|
|
parent_bid: BlockId) =
|
|
## Create `LightClientUpdate` instances for a given block and its post-state,
|
|
## and keep track of best / latest ones. Data about the parent block's
|
|
## post-state must be cached (`cacheLightClientData`) before calling this.
|
|
|
|
# Verify attested block (parent) is recent enough and that state is available
|
|
template attested_bid(): auto = parent_bid
|
|
let attested_slot = attested_bid.slot
|
|
if attested_slot < dag.lcDataStore.cache.tailSlot:
|
|
dag.cacheLightClientData(state, blck,
|
|
current_period_best_update = (ref ForkedLightClientUpdate)(),
|
|
latest_signature_slot = GENESIS_SLOT)
|
|
return
|
|
|
|
# If sync committee period changed, reset `best`
|
|
let
|
|
attested_period = attested_slot.sync_committee_period
|
|
signature_slot = blck.message.slot
|
|
signature_period = signature_slot.sync_committee_period
|
|
attested_data = dag.getLightClientData(attested_bid)
|
|
var best =
|
|
if attested_period != signature_period:
|
|
(ref ForkedLightClientUpdate)()
|
|
else:
|
|
attested_data.current_period_best_update
|
|
|
|
# If sync committee does not have sufficient participants, do not bump latest
|
|
template sync_aggregate(): auto = blck.asSigned().message.body.sync_aggregate
|
|
let
|
|
num_active_participants = sync_aggregate.num_active_participants.uint64
|
|
latest_signature_slot =
|
|
if num_active_participants < MIN_SYNC_COMMITTEE_PARTICIPANTS:
|
|
attested_data.latest_signature_slot
|
|
else:
|
|
signature_slot
|
|
|
|
# To update `best`, sync committee must have sufficient participants, and
|
|
# `signature_slot` must be in `attested_slot`'s sync committee period
|
|
if num_active_participants < MIN_SYNC_COMMITTEE_PARTICIPANTS or
|
|
attested_period != signature_period:
|
|
dag.cacheLightClientData(state, blck,
|
|
current_period_best_update = best,
|
|
latest_signature_slot = latest_signature_slot)
|
|
return
|
|
|
|
# Check if light client data improved
|
|
let
|
|
finalized_slot = attested_data.finalized_slot
|
|
finalized_bsi = dag.getExistingBlockIdAtSlot(finalized_slot)
|
|
has_finality =
|
|
finalized_bsi.isSome and
|
|
finalized_bsi.get.bid.slot >= dag.tail.slot
|
|
meta = LightClientUpdateMetadata(
|
|
attested_slot: attested_slot,
|
|
finalized_slot: finalized_slot,
|
|
signature_slot: signature_slot,
|
|
has_sync_committee: true,
|
|
has_finality: has_finality,
|
|
num_active_participants: num_active_participants)
|
|
is_better = is_better_data(
|
|
meta, attested_data.current_period_best_update[].toMeta())
|
|
if not is_better:
|
|
dag.cacheLightClientData(state, blck,
|
|
current_period_best_update = best,
|
|
latest_signature_slot = latest_signature_slot)
|
|
return
|
|
|
|
# Update best light client data for current sync committee period
|
|
best = newClone attested_data.current_period_best_update[]
|
|
let res = best[].assignLightClientData(
|
|
dag, attested_bid, signature_slot, sync_aggregate,
|
|
Opt.some(state.data.next_sync_committee))
|
|
if not res.isOk:
|
|
dag.cacheLightClientData(state, blck,
|
|
current_period_best_update = attested_data.current_period_best_update,
|
|
latest_signature_slot = latest_signature_slot)
|
|
return
|
|
debug "Best LC update improved", period = attested_period, update = best[]
|
|
dag.cacheLightClientData(state, blck,
|
|
current_period_best_update = best,
|
|
latest_signature_slot = latest_signature_slot)
|
|
|
|
proc initLightClientDataCache*(dag: ChainDAGRef) =
|
|
## Initialize cached light client data
|
|
if not dag.shouldImportLcData:
|
|
return
|
|
|
|
# Initialize tail slot
|
|
let targetTailSlot = max(dag.targetLightClientTailSlot, dag.tail.slot)
|
|
dag.lcDataStore.cache.tailSlot = max(dag.head.slot, targetTailSlot)
|
|
if dag.head.slot < dag.lcDataStore.cache.tailSlot:
|
|
return
|
|
|
|
# Import light client data for finalized period through finalized head
|
|
let
|
|
finalizedSlot = max(dag.finalizedHead.blck.slot, targetTailSlot)
|
|
finalizedPeriod = finalizedSlot.sync_committee_period
|
|
var res =
|
|
if dag.lcDataStore.importMode == LightClientDataImportMode.OnlyNew:
|
|
Opt[void].ok()
|
|
elif finalizedSlot >= dag.lcDataStore.cache.tailSlot:
|
|
Opt[void].ok()
|
|
else:
|
|
dag.lcDataStore.cache.tailSlot = finalizedSlot
|
|
dag.initLightClientDataForPeriod(finalizedPeriod)
|
|
|
|
let lightClientStartTick = Moment.now()
|
|
logScope:
|
|
lightClientDataMaxPeriods = dag.lcDataStore.maxPeriods
|
|
importMode = dag.lcDataStore.importMode
|
|
debug "Initializing cached LC data", res
|
|
|
|
proc isSyncAggregateCanonical(
|
|
dag: ChainDAGRef, state: ForkyHashedBeaconState,
|
|
sync_aggregate: TrustedSyncAggregate, signature_slot: Slot): bool =
|
|
if signature_slot > state.data.slot:
|
|
return false
|
|
let bid = dag.getBlockIdAtSlot(state, signature_slot).valueOr:
|
|
return false
|
|
if bid.slot != signature_slot:
|
|
return false
|
|
let bdata = dag.getForkedBlock(bid).valueOr:
|
|
return false
|
|
withBlck(bdata):
|
|
when consensusFork >= ConsensusFork.Altair:
|
|
forkyBlck.message.body.sync_aggregate == sync_aggregate
|
|
else:
|
|
false
|
|
|
|
# Build list of block to process.
|
|
# As it is slow to load states in descending order,
|
|
# build a reverse todo list to then process them in ascending order
|
|
let tailSlot = dag.lcDataStore.cache.tailSlot
|
|
var
|
|
blocks = newSeqOfCap[BlockId](dag.head.slot - tailSlot + 1)
|
|
bid = dag.head.bid
|
|
while bid.slot > tailSlot:
|
|
blocks.add bid
|
|
bid = dag.existingParent(bid).valueOr:
|
|
dag.handleUnexpectedLightClientError(bid.slot)
|
|
res.err()
|
|
break
|
|
if bid.slot == tailSlot:
|
|
blocks.add bid
|
|
|
|
# Process blocks (reuses `dag.headState`, but restores it to the current head)
|
|
var cache: StateCache
|
|
for i in countdown(blocks.high, blocks.low):
|
|
bid = blocks[i]
|
|
if not dag.updateExistingState(
|
|
dag.headState, bid.atSlot(), save = false, cache):
|
|
dag.handleUnexpectedLightClientError(bid.slot)
|
|
res.err()
|
|
continue
|
|
let bdata = dag.getExistingForkedBlock(bid).valueOr:
|
|
dag.handleUnexpectedLightClientError(bid.slot)
|
|
res.err()
|
|
continue
|
|
withStateAndBlck(dag.headState, bdata):
|
|
when consensusFork >= ConsensusFork.Altair:
|
|
if i == blocks.high:
|
|
let
|
|
period = bid.slot.sync_committee_period
|
|
best = newClone dag.lcDataStore.db.getBestUpdate(period)
|
|
withForkyUpdate(best[]):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
let
|
|
attestedSlot = forkyUpdate.attested_header.beacon.slot
|
|
signatureSlot = forkyUpdate.signature_slot
|
|
if attestedSlot.sync_committee_period != period or
|
|
signatureSlot.sync_committee_period != period:
|
|
error "Invalid LC data cached", best = best[], period
|
|
best[].reset()
|
|
elif not dag.isSyncAggregateCanonical(
|
|
forkyState,
|
|
forkyUpdate.sync_aggregate.asTrusted(), # From DB, is trusted
|
|
forkyUpdate.signature_slot):
|
|
best[].reset() # Cached data is too recent or from other branch
|
|
else:
|
|
discard # Cached data is ancestor of `bid`
|
|
dag.cacheLightClientData(forkyState, forkyBlck,
|
|
current_period_best_update = best,
|
|
latest_signature_slot = GENESIS_SLOT)
|
|
else:
|
|
dag.createLightClientUpdates(
|
|
forkyState, forkyBlck, parentBid = blocks[i + 1])
|
|
else: raiseAssert "Unreachable"
|
|
|
|
let lightClientEndTick = Moment.now()
|
|
debug "Initialized cached LC data",
|
|
initDur = lightClientEndTick - lightClientStartTick, res
|
|
if res.isErr:
|
|
return
|
|
|
|
# Import historic data
|
|
if dag.lcDataStore.importMode == LightClientDataImportMode.Full:
|
|
dag.lcDataStore.cache.tailSlot = targetTailSlot
|
|
let targetTailPeriod = targetTailSlot.sync_committee_period
|
|
if targetTailPeriod < finalizedPeriod:
|
|
# `countdown` through 0 fails on distinct `uint64`
|
|
# https://github.com/nim-lang/Nim/pull/19926
|
|
var period = finalizedPeriod - 1
|
|
while period >= targetTailPeriod:
|
|
if dag.initLightClientDataForPeriod(period).isErr:
|
|
res.err()
|
|
if period <= targetTailPeriod:
|
|
break
|
|
dec period
|
|
debug "Historic LC data imported", res
|
|
|
|
proc processNewBlockForLightClient*(
|
|
dag: ChainDAGRef,
|
|
state: ForkedHashedBeaconState,
|
|
signedBlock: ForkyTrustedSignedBeaconBlock,
|
|
parentBid: BlockId) =
|
|
## Update light client data with information from a new block.
|
|
if not dag.shouldImportLcData:
|
|
return
|
|
if signedBlock.message.slot < dag.lcDataStore.cache.tailSlot:
|
|
return
|
|
|
|
const consensusFork = typeof(signedBlock).kind
|
|
when consensusFork >= ConsensusFork.Altair:
|
|
template forkyState: untyped = state.forky(consensusFork)
|
|
dag.createLightClientUpdates(forkyState, signedBlock, parentBid)
|
|
else:
|
|
raiseAssert "Unreachable" # `tailSlot` cannot be before Altair
|
|
|
|
proc processHeadChangeForLightClient*(dag: ChainDAGRef) =
|
|
## Update light client data to account for a new head block.
|
|
## Note that `dag.finalizedHead` is not yet updated when this is called.
|
|
if not dag.shouldImportLcData:
|
|
return
|
|
if dag.head.slot < dag.lcDataStore.cache.tailSlot:
|
|
return
|
|
|
|
# Commit best light client data for non-finalized periods
|
|
let
|
|
headPeriod = dag.head.slot.sync_committee_period
|
|
lowSlot = max(dag.lcDataStore.cache.tailSlot, dag.finalizedHead.slot)
|
|
lowPeriod = lowSlot.sync_committee_period
|
|
var blck = dag.head
|
|
for period in countdown(headPeriod, lowPeriod):
|
|
blck = blck.get_ancestor((period + 1).start_slot - 1)
|
|
if blck == nil or blck.slot < lowSlot:
|
|
break
|
|
dag.lcDataStore.db.putBestUpdate(
|
|
blck.slot.sync_committee_period,
|
|
dag.getLightClientData(blck.bid).current_period_best_update[])
|
|
|
|
# Update latest light client data
|
|
template latest(): untyped = dag.lcDataStore.cache.latest
|
|
let
|
|
head_data = dag.getLightClientData(dag.head.bid)
|
|
signature_slot = head_data.latest_signature_slot
|
|
if signature_slot <= lowSlot:
|
|
latest.reset()
|
|
return
|
|
blck = dag.head.get_ancestor(signature_slot)
|
|
if blck == nil or blck.parent == nil or blck.parent.slot < lowSlot:
|
|
# If `attested_bid` is before `finalizedHead`, we don't have cached data.
|
|
latest.reset()
|
|
return
|
|
let
|
|
signature_bid = blck.bid
|
|
attested_bid = blck.parent.bid
|
|
sync_aggregate = dag.getExistingSyncAggregate(signature_bid).valueOr:
|
|
dag.handleUnexpectedLightClientError(signature_bid.slot)
|
|
return
|
|
old_meta = latest.toMeta()
|
|
latest.assignLightClientData(
|
|
dag, attested_bid, signature_slot, sync_aggregate)
|
|
let
|
|
new_meta = latest.toMeta()
|
|
new_optimistic =
|
|
if new_meta.attested_slot != old_meta.attested_slot:
|
|
new_meta.attested_slot > old_meta.attested_slot
|
|
else:
|
|
new_meta.signature_slot > old_meta.signature_slot
|
|
new_finality =
|
|
if not new_meta.has_finality:
|
|
false
|
|
elif new_meta.finalized_slot != old_meta.finalized_slot:
|
|
new_meta.finalized_slot > old_meta.finalized_slot
|
|
else:
|
|
let
|
|
old_has_supermajority =
|
|
hasSupermajoritySyncParticipation(old_meta.num_active_participants)
|
|
new_has_supermajority =
|
|
hasSupermajoritySyncParticipation(new_meta.num_active_participants)
|
|
new_has_supermajority > old_has_supermajority
|
|
if new_finality and dag.lcDataStore.onLightClientFinalityUpdate != nil:
|
|
dag.lcDataStore.onLightClientFinalityUpdate(latest)
|
|
if new_optimistic and dag.lcDataStore.onLightClientOptimisticUpdate != nil:
|
|
dag.lcDataStore.onLightClientOptimisticUpdate(latest.toOptimistic())
|
|
|
|
proc processFinalizationForLightClient*(
|
|
dag: ChainDAGRef, oldFinalizedHead: BlockSlot) =
|
|
## Prune cached data that is no longer useful for creating future
|
|
## `LightClientUpdate` and `LightClientBootstrap` instances.
|
|
## This needs to be called whenever `finalized_checkpoint` changes.
|
|
if not dag.shouldImportLcData:
|
|
return
|
|
let finalizedSlot = dag.finalizedHead.slot
|
|
if finalizedSlot < dag.lcDataStore.cache.tailSlot:
|
|
return
|
|
|
|
# Cache `LightClientBootstrap` for newly finalized epoch boundary blocks
|
|
let
|
|
firstNewSlot = oldFinalizedHead.slot + 1
|
|
lowSlot = max(firstNewSlot, dag.lcDataStore.cache.tailSlot)
|
|
var boundarySlot = finalizedSlot
|
|
while boundarySlot >= lowSlot:
|
|
let
|
|
bsi = dag.getExistingBlockIdAtSlot(boundarySlot).valueOr:
|
|
dag.handleUnexpectedLightClientError(boundarySlot)
|
|
break
|
|
bid = bsi.bid
|
|
if bid.slot >= lowSlot:
|
|
let
|
|
bdata = dag.getExistingForkedBlock(bid).valueOr:
|
|
dag.handleUnexpectedLightClientError(bid.slot)
|
|
break
|
|
period = bid.slot.sync_committee_period
|
|
if not dag.lcDataStore.db.hasSyncCommittee(period):
|
|
let didPutSyncCommittee = withState(dag.headState):
|
|
when consensusFork >= ConsensusFork.Altair:
|
|
if period == forkyState.data.slot.sync_committee_period:
|
|
dag.lcDataStore.db.putSyncCommittee(
|
|
period, forkyState.data.current_sync_committee)
|
|
true
|
|
else:
|
|
false
|
|
else:
|
|
false
|
|
if not didPutSyncCommittee:
|
|
let
|
|
tmpState = assignClone(dag.headState)
|
|
syncCommittee = dag.existingCurrentSyncCommitteeForPeriod(
|
|
tmpState[], period).valueOr:
|
|
dag.handleUnexpectedLightClientError(bid.slot)
|
|
break
|
|
dag.lcDataStore.db.putSyncCommittee(period, syncCommittee)
|
|
withBlck(bdata):
|
|
when consensusFork >= ConsensusFork.Altair:
|
|
const lcDataFork = lcDataForkAtConsensusFork(consensusFork)
|
|
dag.lcDataStore.db.putHeader(
|
|
forkyBlck.toLightClientHeader(lcDataFork))
|
|
else: raiseAssert "Unreachable"
|
|
dag.lcDataStore.db.putCurrentSyncCommitteeBranch(
|
|
bid.slot, dag.getLightClientData(bid).current_sync_committee_branch)
|
|
boundarySlot = bid.slot.nextEpochBoundarySlot
|
|
if boundarySlot < SLOTS_PER_EPOCH:
|
|
break
|
|
boundarySlot -= SLOTS_PER_EPOCH
|
|
|
|
# Seal sync committee periods for which data can no longer improve further
|
|
let
|
|
oldFinalizedPeriod = oldFinalizedHead.slot.sync_committee_period
|
|
newFinalizedPeriod = dag.finalizedHead.slot.sync_committee_period
|
|
if newFinalizedPeriod > oldFinalizedPeriod:
|
|
for period in countdown(newFinalizedPeriod - 1, oldFinalizedPeriod):
|
|
if dag.lcDataStore.cache.tailSlot > period.start_slot:
|
|
break
|
|
debug "Best LC update sealed",
|
|
period, update = dag.lcDataStore.db.getBestUpdate(period)
|
|
dag.lcDataStore.db.sealPeriod(period)
|
|
|
|
# Prune light client data that is no longer referrable by future updates
|
|
var bidsToDelete: seq[BlockId]
|
|
for bid, data in dag.lcDataStore.cache.data:
|
|
if bid.slot >= dag.finalizedHead.blck.slot:
|
|
continue
|
|
bidsToDelete.add bid
|
|
for bid in bidsToDelete:
|
|
dag.lcDataStore.cache.data.del bid
|
|
|
|
# Prune seal tracking data that is no longer relevant
|
|
let targetTailPeriod = dag.targetLightClientTailSlot.sync_committee_period
|
|
dag.lcDataStore.db.keepPeriodsFrom(targetTailPeriod)
|
|
|
|
proc getLightClientBootstrap(
|
|
dag: ChainDAGRef,
|
|
header: ForkyLightClientHeader): ForkedLightClientBootstrap =
|
|
let
|
|
slot = header.beacon.slot
|
|
period = slot.sync_committee_period
|
|
blockRoot = hash_tree_root(header)
|
|
if slot < dag.targetLightClientTailSlot:
|
|
debug "LC bootstrap unavailable: Block too old", slot
|
|
return default(ForkedLightClientBootstrap)
|
|
if slot > dag.finalizedHead.blck.slot:
|
|
debug "LC bootstrap unavailable: Not finalized", blockRoot
|
|
return default(ForkedLightClientBootstrap)
|
|
|
|
# Ensure `current_sync_committee_branch` is known
|
|
if dag.lcDataStore.importMode == LightClientDataImportMode.OnDemand and
|
|
not dag.lcDataStore.db.hasCurrentSyncCommitteeBranch(slot):
|
|
let
|
|
bsi = dag.getExistingBlockIdAtSlot(slot).valueOr:
|
|
return default(ForkedLightClientBootstrap)
|
|
tmpState = assignClone(dag.headState)
|
|
dag.withUpdatedExistingState(tmpState[], bsi) do:
|
|
withState(updatedState):
|
|
when consensusFork >= ConsensusFork.Altair:
|
|
if not dag.lcDataStore.db.hasSyncCommittee(period):
|
|
dag.lcDataStore.db.putSyncCommittee(
|
|
period, forkyState.data.current_sync_committee)
|
|
dag.lcDataStore.db.putHeader(header)
|
|
dag.lcDataStore.db.putCurrentSyncCommitteeBranch(
|
|
slot, forkyState.data.build_proof(
|
|
altair.CURRENT_SYNC_COMMITTEE_GINDEX).get)
|
|
else: raiseAssert "Unreachable"
|
|
do: return default(ForkedLightClientBootstrap)
|
|
|
|
# Ensure `current_sync_committee` is known
|
|
if not dag.lcDataStore.db.hasSyncCommittee(period):
|
|
let
|
|
tmpState = assignClone(dag.headState)
|
|
syncCommittee = dag.existingCurrentSyncCommitteeForPeriod(
|
|
tmpState[], period).valueOr:
|
|
return default(ForkedLightClientBootstrap)
|
|
dag.lcDataStore.db.putSyncCommittee(period, syncCommittee)
|
|
|
|
# Construct `LightClientBootstrap` from cached data
|
|
const lcDataFork = typeof(header).kind
|
|
ForkedLightClientBootstrap.init(lcDataFork.LightClientBootstrap(
|
|
header: header,
|
|
current_sync_committee: (block:
|
|
dag.lcDataStore.db.getSyncCommittee(period).valueOr:
|
|
debug "LC bootstrap unavailable: Sync committee not cached", period
|
|
return default(ForkedLightClientBootstrap)),
|
|
current_sync_committee_branch: (block:
|
|
dag.lcDataStore.db.getCurrentSyncCommitteeBranch(slot).valueOr:
|
|
debug "LC bootstrap unavailable: Committee branch not cached", slot
|
|
return default(ForkedLightClientBootstrap))))
|
|
|
|
proc getLightClientBootstrap*(
|
|
dag: ChainDAGRef,
|
|
blockRoot: Eth2Digest): ForkedLightClientBootstrap =
|
|
if not dag.lcDataStore.serve:
|
|
return default(ForkedLightClientBootstrap)
|
|
|
|
# Try to load from cache
|
|
withAll(LightClientDataFork):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
let header = getHeader[lcDataFork.LightClientHeader](
|
|
dag.lcDataStore.db, blockRoot)
|
|
if header.isOk:
|
|
return dag.getLightClientBootstrap(header.get)
|
|
|
|
# Fallback to DAG
|
|
let bdata = dag.getForkedBlock(blockRoot).valueOr:
|
|
debug "LC bootstrap unavailable: Block not found", blockRoot
|
|
return default(ForkedLightClientBootstrap)
|
|
withBlck(bdata):
|
|
when consensusFork >= ConsensusFork.Altair:
|
|
const lcDataFork = lcDataForkAtConsensusFork(consensusFork)
|
|
let
|
|
header = forkyBlck.toLightClientHeader(lcDataFork)
|
|
bootstrap = dag.getLightClientBootstrap(header)
|
|
if bootstrap.kind > LightClientDataFork.None:
|
|
dag.lcDataStore.db.putHeader(header)
|
|
return bootstrap
|
|
else:
|
|
debug "LC bootstrap unavailable: Block before Altair", blockRoot
|
|
return default(ForkedLightClientBootstrap)
|
|
|
|
proc getLightClientUpdateForPeriod*(
|
|
dag: ChainDAGRef,
|
|
period: SyncCommitteePeriod): ForkedLightClientUpdate =
|
|
if not dag.lcDataStore.serve:
|
|
return default(ForkedLightClientUpdate)
|
|
|
|
if dag.lcDataStore.importMode == LightClientDataImportMode.OnDemand and
|
|
period < dag.finalizedHead.blck.slot.sync_committee_period:
|
|
if dag.initLightClientUpdateForPeriod(period).isErr:
|
|
return default(ForkedLightClientUpdate)
|
|
let
|
|
update = dag.lcDataStore.db.getBestUpdate(period)
|
|
numParticipants = withForkyUpdate(update):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
forkyUpdate.sync_aggregate.num_active_participants
|
|
else:
|
|
0
|
|
if numParticipants < MIN_SYNC_COMMITTEE_PARTICIPANTS:
|
|
return default(ForkedLightClientUpdate)
|
|
update
|
|
|
|
proc getLightClientFinalityUpdate*(
|
|
dag: ChainDAGRef): ForkedLightClientFinalityUpdate =
|
|
if not dag.lcDataStore.serve:
|
|
return default(ForkedLightClientFinalityUpdate)
|
|
|
|
let
|
|
finalityUpdate = dag.lcDataStore.cache.latest
|
|
numParticipants = withForkyFinalityUpdate(finalityUpdate):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
forkyFinalityUpdate.sync_aggregate.num_active_participants
|
|
else:
|
|
0
|
|
if numParticipants < MIN_SYNC_COMMITTEE_PARTICIPANTS:
|
|
return default(ForkedLightClientFinalityUpdate)
|
|
finalityUpdate
|
|
|
|
proc getLightClientOptimisticUpdate*(
|
|
dag: ChainDAGRef): ForkedLightClientOptimisticUpdate =
|
|
if not dag.lcDataStore.serve:
|
|
return default(ForkedLightClientOptimisticUpdate)
|
|
|
|
let
|
|
optimisticUpdate = dag.lcDataStore.cache.latest.toOptimistic
|
|
numParticipants = withForkyOptimisticUpdate(optimisticUpdate):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
forkyOptimisticUpdate.sync_aggregate.num_active_participants
|
|
else:
|
|
0
|
|
if numParticipants < MIN_SYNC_COMMITTEE_PARTICIPANTS:
|
|
return default(ForkedLightClientOptimisticUpdate)
|
|
optimisticUpdate
|