nimbus-eth1/fluffy/network/beacon_light_client/beacon_light_client.nim

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# beacon hain light client
# Copyright (c) 2022 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [Defect].}
import
chronicles,
eth/p2p/discoveryv5/random2,
beacon_chain/gossip_processing/light_client_processor,
beacon_chain/spec/datatypes/altair,
beacon_chain/beacon_clock,
"."/[light_client_network, beacon_light_client_manager]
export LightClientFinalizationMode
logScope: topics = "lightcl"
type
LightClientHeaderCallback* =
proc(lightClient: LightClient, header: BeaconBlockHeader) {.
gcsafe, raises: [Defect].}
LightClient* = ref object
network: LightClientNetwork
cfg: RuntimeConfig
forkDigests: ref ForkDigests
getBeaconTime: GetBeaconTimeFn
store: ref Option[LightClientStore]
processor: ref LightClientProcessor
manager: LightClientManager
onFinalizedHeader*, onOptimisticHeader*: LightClientHeaderCallback
trustedBlockRoot*: Option[Eth2Digest]
func finalizedHeader*(lightClient: LightClient): Opt[BeaconBlockHeader] =
if lightClient.store[].isSome:
ok lightClient.store[].get.finalized_header
else:
err()
func optimisticHeader*(lightClient: LightClient): Opt[BeaconBlockHeader] =
if lightClient.store[].isSome:
ok lightClient.store[].get.optimistic_header
else:
err()
proc new*(
T: type LightClient,
network: LightClientNetwork,
rng: ref HmacDrbgContext,
dumpEnabled: bool,
dumpDirInvalid, dumpDirIncoming: string,
cfg: RuntimeConfig,
forkDigests: ref ForkDigests,
getBeaconTime: GetBeaconTimeFn,
genesis_validators_root: Eth2Digest,
finalizationMode: LightClientFinalizationMode): T =
let lightClient = LightClient(
network: network,
cfg: cfg,
forkDigests: forkDigests,
getBeaconTime: getBeaconTime,
store: (ref Option[LightClientStore])())
func getTrustedBlockRoot(): Option[Eth2Digest] =
lightClient.trustedBlockRoot
proc onStoreInitialized() =
discard
proc onFinalizedHeader() =
if lightClient.onFinalizedHeader != nil:
lightClient.onFinalizedHeader(
lightClient, lightClient.finalizedHeader.get)
proc onOptimisticHeader() =
if lightClient.onOptimisticHeader != nil:
lightClient.onOptimisticHeader(
lightClient, lightClient.optimisticHeader.get)
lightClient.processor = LightClientProcessor.new(
dumpEnabled, dumpDirInvalid, dumpDirIncoming,
cfg, genesis_validators_root, finalizationMode,
lightClient.store, getBeaconTime, getTrustedBlockRoot,
onStoreInitialized, onFinalizedHeader, onOptimisticHeader)
proc lightClientVerifier(obj: SomeLightClientObject):
Future[Result[void, BlockError]] =
let resfut = newFuture[Result[void, BlockError]]("lightClientVerifier")
lightClient.processor[].addObject(MsgSource.gossip, obj, resfut)
resfut
proc bootstrapVerifier(obj: altair.LightClientBootstrap): auto =
lightClientVerifier(obj)
proc updateVerifier(obj: altair.LightClientUpdate): auto =
lightClientVerifier(obj)
proc finalityVerifier(obj: altair.LightClientFinalityUpdate): auto =
lightClientVerifier(obj)
proc optimisticVerifier(obj: altair.LightClientOptimisticUpdate): auto =
lightClientVerifier(obj)
func isLightClientStoreInitialized(): bool =
lightClient.store[].isSome
func isNextSyncCommitteeKnown(): bool =
if lightClient.store[].isSome:
lightClient.store[].get.is_next_sync_committee_known
else:
false
func getFinalizedSlot(): Slot =
if lightClient.store[].isSome:
lightClient.store[].get.finalized_header.slot
else:
GENESIS_SLOT
func getOptimistiSlot(): Slot =
if lightClient.store[].isSome:
lightClient.store[].get.optimistic_header.slot
else:
GENESIS_SLOT
lightClient.manager = LightClientManager.init(
lightClient.network, rng, getTrustedBlockRoot,
bootstrapVerifier, updateVerifier, finalityVerifier, optimisticVerifier,
isLightClientStoreInitialized, isNextSyncCommitteeKnown,
getFinalizedSlot, getOptimistiSlot, getBeaconTime)
lightClient
proc new*(
T: type LightClient,
network: LightClientNetwork,
rng: ref HmacDrbgContext,
cfg: RuntimeConfig,
forkDigests: ref ForkDigests,
getBeaconTime: GetBeaconTimeFn,
genesis_validators_root: Eth2Digest,
finalizationMode: LightClientFinalizationMode): T =
LightClient.new(
network, rng,
dumpEnabled = false, dumpDirInvalid = ".", dumpDirIncoming = ".",
cfg, forkDigests, getBeaconTime, genesis_validators_root, finalizationMode
)
proc start*(lightClient: LightClient) =
notice "Starting light client",
trusted_block_root = lightClient.trustedBlockRoot
lightClient.manager.start()
proc resetToFinalizedHeader*(
lightClient: LightClient,
header: BeaconBlockHeader,
current_sync_committee: SyncCommittee) =
lightClient.processor[].resetToFinalizedHeader(header, current_sync_committee)