mirror of
https://github.com/status-im/nimbus-eth2.git
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9180f09641
The optimistic sync spec was updated since the LC based optsync module was introduced. It is no longer necessary to wait for the justified checkpoint to have execution enabled; instead, any block is okay to be optimistically imported to the EL client, as long as its parent block has execution enabled. Complex syncing logic has been removed, and the LC optsync module will now follow gossip directly, reducing the latency when using this module. Note that because this is now based on gossip instead of using sync manager / request manager, that individual blocks may be missed. However, EL clients should recover from this by fetching missing blocks themselves.
366 lines
13 KiB
Nim
366 lines
13 KiB
Nim
# beacon_chain
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# Copyright (c) 2022 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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when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect].}
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else:
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{.push raises: [].}
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import
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chronicles,
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eth/keys,
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./gossip_processing/light_client_processor,
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./networking/[eth2_network, topic_params],
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./spec/datatypes/altair,
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./spec/helpers,
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./sync/light_client_manager,
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"."/[beacon_clock, conf_light_client]
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export LightClientFinalizationMode, eth2_network, conf_light_client
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logScope: topics = "lightcl"
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type
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LightClientHeaderCallback* =
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proc(lightClient: LightClient, header: BeaconBlockHeader) {.
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gcsafe, raises: [Defect].}
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LightClient* = ref object
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network: Eth2Node
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cfg: RuntimeConfig
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forkDigests: ref ForkDigests
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getBeaconTime: GetBeaconTimeFn
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store: ref Option[LightClientStore]
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processor: ref LightClientProcessor
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manager: LightClientManager
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gossipState: GossipState
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onFinalizedHeader*, onOptimisticHeader*: LightClientHeaderCallback
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trustedBlockRoot*: Option[Eth2Digest]
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func finalizedHeader*(lightClient: LightClient): Opt[BeaconBlockHeader] =
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if lightClient.store[].isSome:
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ok lightClient.store[].get.finalized_header
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else:
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err()
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func optimisticHeader*(lightClient: LightClient): Opt[BeaconBlockHeader] =
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if lightClient.store[].isSome:
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ok lightClient.store[].get.optimistic_header
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else:
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err()
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proc createLightClient(
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network: Eth2Node,
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rng: ref HmacDrbgContext,
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dumpEnabled: bool,
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dumpDirInvalid, dumpDirIncoming: string,
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cfg: RuntimeConfig,
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forkDigests: ref ForkDigests,
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getBeaconTime: GetBeaconTimeFn,
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genesis_validators_root: Eth2Digest,
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finalizationMode: LightClientFinalizationMode
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): LightClient =
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let lightClient = LightClient(
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network: network,
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cfg: cfg,
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forkDigests: forkDigests,
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getBeaconTime: getBeaconTime,
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store: (ref Option[LightClientStore])())
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func getTrustedBlockRoot(): Option[Eth2Digest] =
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lightClient.trustedBlockRoot
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proc onStoreInitialized() =
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discard
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proc onFinalizedHeader() =
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if lightClient.onFinalizedHeader != nil:
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lightClient.onFinalizedHeader(
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lightClient, lightClient.finalizedHeader.get)
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proc onOptimisticHeader() =
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if lightClient.onOptimisticHeader != nil:
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lightClient.onOptimisticHeader(
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lightClient, lightClient.optimisticHeader.get)
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lightClient.processor = LightClientProcessor.new(
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dumpEnabled, dumpDirInvalid, dumpDirIncoming,
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cfg, genesis_validators_root, finalizationMode,
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lightClient.store, getBeaconTime, getTrustedBlockRoot,
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onStoreInitialized, onFinalizedHeader, onOptimisticHeader)
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proc lightClientVerifier(obj: SomeLightClientObject):
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Future[Result[void, BlockError]] =
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let resfut = newFuture[Result[void, BlockError]]("lightClientVerifier")
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lightClient.processor[].addObject(MsgSource.gossip, obj, resfut)
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resfut
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proc bootstrapVerifier(obj: altair.LightClientBootstrap): auto =
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lightClientVerifier(obj)
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proc updateVerifier(obj: altair.LightClientUpdate): auto =
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lightClientVerifier(obj)
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proc finalityVerifier(obj: altair.LightClientFinalityUpdate): auto =
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lightClientVerifier(obj)
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proc optimisticVerifier(obj: altair.LightClientOptimisticUpdate): auto =
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lightClientVerifier(obj)
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func isLightClientStoreInitialized(): bool =
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lightClient.store[].isSome
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func isNextSyncCommitteeKnown(): bool =
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if lightClient.store[].isSome:
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lightClient.store[].get.is_next_sync_committee_known
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else:
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false
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func getFinalizedPeriod(): SyncCommitteePeriod =
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if lightClient.store[].isSome:
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lightClient.store[].get.finalized_header.slot.sync_committee_period
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else:
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GENESIS_SLOT.sync_committee_period
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func getOptimisticPeriod(): SyncCommitteePeriod =
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if lightClient.store[].isSome:
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lightClient.store[].get.optimistic_header.slot.sync_committee_period
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else:
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GENESIS_SLOT.sync_committee_period
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lightClient.manager = LightClientManager.init(
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lightClient.network, rng, getTrustedBlockRoot,
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bootstrapVerifier, updateVerifier, finalityVerifier, optimisticVerifier,
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isLightClientStoreInitialized, isNextSyncCommitteeKnown,
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getFinalizedPeriod, getOptimisticPeriod, getBeaconTime)
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lightClient.gossipState = {}
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lightClient
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proc createLightClient*(
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network: Eth2Node,
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rng: ref HmacDrbgContext,
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config: BeaconNodeConf,
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cfg: RuntimeConfig,
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forkDigests: ref ForkDigests,
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getBeaconTime: GetBeaconTimeFn,
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genesis_validators_root: Eth2Digest,
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finalizationMode: LightClientFinalizationMode
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): LightClient =
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createLightClient(
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network, rng,
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config.dumpEnabled, config.dumpDirInvalid, config.dumpDirIncoming,
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cfg, forkDigests, getBeaconTime, genesis_validators_root, finalizationMode)
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proc createLightClient*(
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network: Eth2Node,
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rng: ref HmacDrbgContext,
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config: LightClientConf,
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cfg: RuntimeConfig,
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forkDigests: ref ForkDigests,
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getBeaconTime: GetBeaconTimeFn,
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genesis_validators_root: Eth2Digest,
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finalizationMode: LightClientFinalizationMode
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): LightClient =
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createLightClient(
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network, rng,
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dumpEnabled = false, dumpDirInvalid = ".", dumpDirIncoming = ".",
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cfg, forkDigests, getBeaconTime, genesis_validators_root, finalizationMode)
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proc start*(lightClient: LightClient) =
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notice "Starting light client",
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trusted_block_root = lightClient.trustedBlockRoot
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lightClient.manager.start()
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proc resetToFinalizedHeader*(
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lightClient: LightClient,
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header: BeaconBlockHeader,
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current_sync_committee: SyncCommittee) =
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lightClient.processor[].resetToFinalizedHeader(header, current_sync_committee)
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import metrics
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from
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./gossip_processing/eth2_processor
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import
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processLightClientFinalityUpdate, processLightClientOptimisticUpdate
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declareCounter beacon_light_client_finality_updates_received,
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"Number of valid LC finality updates processed by this node"
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declareCounter beacon_light_client_finality_updates_dropped,
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"Number of invalid LC finality updates dropped by this node", labels = ["reason"]
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declareCounter beacon_light_client_optimistic_updates_received,
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"Number of valid LC optimistic updates processed by this node"
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declareCounter beacon_light_client_optimistic_updates_dropped,
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"Number of invalid LC optimistic updates dropped by this node", labels = ["reason"]
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template logReceived(
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msg: altair.LightClientFinalityUpdate) =
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debug "LC finality update received", finality_update = msg
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template logValidated(
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msg: altair.LightClientFinalityUpdate) =
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trace "LC finality update validated", finality_update = msg
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beacon_light_client_finality_updates_received.inc()
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proc logDropped(
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msg: altair.LightClientFinalityUpdate, es: varargs[ValidationError]) =
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for e in es:
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debug "Dropping LC finality update", finality_update = msg, error = e
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beacon_light_client_finality_updates_dropped.inc(1, [$es[0][0]])
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template logReceived(
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msg: altair.LightClientOptimisticUpdate) =
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debug "LC optimistic update received", optimistic_update = msg
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template logValidated(
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msg: altair.LightClientOptimisticUpdate) =
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trace "LC optimistic update validated", optimistic_update = msg
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beacon_light_client_optimistic_updates_received.inc()
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proc logDropped(
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msg: altair.LightClientOptimisticUpdate, es: varargs[ValidationError]) =
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for e in es:
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debug "Dropping LC optimistic update", optimistic_update = msg, error = e
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beacon_light_client_optimistic_updates_dropped.inc(1, [$es[0][0]])
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proc installMessageValidators*(
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lightClient: LightClient, eth2Processor: ref Eth2Processor = nil) =
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# When registering multiple message validators, IGNORE results take precedence
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# over ACCEPT results. However, because the opposite behaviour is needed here,
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# we handle both full node and light client validation in this module
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template getLocalWallPeriod(): auto =
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lightClient.getBeaconTime().slotOrZero().sync_committee_period
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template validate[T: SomeLightClientObject](
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msg: T, validatorProcName: untyped): ValidationResult =
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msg.logReceived()
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var
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ignoreErrors {.noinit.}: array[2, ValidationError]
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numIgnoreErrors = 0
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let res1 =
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if eth2Processor != nil:
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let
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v = eth2Processor[].`validatorProcName`(MsgSource.gossip, msg)
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res = v.toValidationResult()
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if res == ValidationResult.Reject:
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msg.logDropped(v.error)
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return res
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if res == ValidationResult.Ignore:
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ignoreErrors[numIgnoreErrors] = v.error
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inc numIgnoreErrors
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res
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else:
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ValidationResult.Ignore
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let res2 =
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if lightClient.manager.isGossipSupported(getLocalWallPeriod()):
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let
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v = lightClient.processor[].`validatorProcName`(MsgSource.gossip, msg)
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res = v.toValidationResult()
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if res == ValidationResult.Reject:
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msg.logDropped(v.error)
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return res
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if res == ValidationResult.Ignore:
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ignoreErrors[numIgnoreErrors] = v.error
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inc numIgnoreErrors
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res
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else:
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ValidationResult.Ignore
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if res1 == ValidationResult.Accept or res2 == ValidationResult.Accept:
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msg.logValidated()
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return ValidationResult.Accept
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doAssert res1 == ValidationResult.Ignore and res2 == ValidationResult.Ignore
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if numIgnoreErrors == 0:
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ignoreErrors[numIgnoreErrors] = static:
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(ValidationResult.Ignore, cstring T.name & ": irrelevant")
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inc numIgnoreErrors
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msg.logDropped(ignoreErrors.toOpenArray(0, numIgnoreErrors - 1))
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ValidationResult.Ignore
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let forkDigests = lightClient.forkDigests
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for digest in [forkDigests.altair, forkDigests.bellatrix]:
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lightClient.network.addValidator(
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getLightClientFinalityUpdateTopic(digest),
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proc(msg: altair.LightClientFinalityUpdate): ValidationResult =
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validate(msg, processLightClientFinalityUpdate))
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lightClient.network.addValidator(
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getLightClientOptimisticUpdateTopic(digest),
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proc(msg: altair.LightClientOptimisticUpdate): ValidationResult =
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validate(msg, processLightClientOptimisticUpdate))
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proc updateGossipStatus*(
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lightClient: LightClient, slot: Slot, dagIsBehind = default(Option[bool])) =
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template cfg(): auto = lightClient.cfg
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let
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epoch = slot.epoch
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lcBehind =
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not lightClient.manager.isGossipSupported(slot.sync_committee_period)
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dagBehind =
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# While separate message validators can be installed for both
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# full node and light client (both are called unless one rejects msg),
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# only a single subscription is supported per topic.
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# The full node subscription is also handled in this module, even though
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# it does not directly relate to the client side of the LC sync protocol
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dagIsBehind.get(true)
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isBehind = lcBehind and dagBehind
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currentEpochTargetGossipState = getTargetGossipState(
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epoch, cfg.ALTAIR_FORK_EPOCH, cfg.BELLATRIX_FORK_EPOCH, isBehind)
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targetGossipState =
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if lcBehind or epoch < 1:
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currentEpochTargetGossipState
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else:
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# The fork digest for light client topics depends on the attested slot,
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# which is in the past relative to the signature slot (current slot).
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# Therefore, LC topic subscriptions are kept for 1 extra epoch.
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let previousEpochTargetGossipState = getTargetGossipState(
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epoch - 1, cfg.ALTAIR_FORK_EPOCH, cfg.BELLATRIX_FORK_EPOCH, isBehind)
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currentEpochTargetGossipState + previousEpochTargetGossipState
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template currentGossipState(): auto = lightClient.gossipState
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if currentGossipState == targetGossipState:
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return
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if currentGossipState.card == 0 and targetGossipState.card > 0:
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debug "Enabling LC topic subscriptions",
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wallSlot = slot, targetGossipState
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elif currentGossipState.card > 0 and targetGossipState.card == 0:
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debug "Disabling LC topic subscriptions",
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wallSlot = slot
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else:
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# Individual forks added / removed
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discard
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let
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newGossipForks = targetGossipState - currentGossipState
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oldGossipForks = currentGossipState - targetGossipState
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for gossipFork in oldGossipForks:
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if gossipFork >= BeaconStateFork.Altair:
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let forkDigest = lightClient.forkDigests[].atStateFork(gossipFork)
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lightClient.network.unsubscribe(
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getLightClientFinalityUpdateTopic(forkDigest))
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lightClient.network.unsubscribe(
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getLightClientOptimisticUpdateTopic(forkDigest))
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for gossipFork in newGossipForks:
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if gossipFork >= BeaconStateFork.Altair:
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let forkDigest = lightClient.forkDigests[].atStateFork(gossipFork)
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lightClient.network.subscribe(
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getLightClientFinalityUpdateTopic(forkDigest),
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basicParams)
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lightClient.network.subscribe(
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getLightClientOptimisticUpdateTopic(forkDigest),
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basicParams)
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lightClient.gossipState = targetGossipState
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