104 lines
3.4 KiB
Nim
104 lines
3.4 KiB
Nim
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# 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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{.push raises: [Defect].}
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# This implements the pre-release proposal of the libp2p based light client sync
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# protocol. See https://github.com/ethereum/consensus-specs/pull/2802
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import
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chronicles,
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./beacon_node
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logScope: topics = "beacnde"
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proc initLightClient*(
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node: BeaconNode,
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rng: ref BrHmacDrbgContext,
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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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template config(): auto = node.config
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# Creating a light client is not dependent on `lightClientEnable`
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# because the light client module also handles gossip subscriptions
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# for broadcasting light client data as a server.
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let lightClient = createLightClient(
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node.network, rng, config, cfg,
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forkDigests, getBeaconTime, genesis_validators_root)
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if config.lightClientEnable.get:
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lightClient.trustedBlockRoot = config.lightClientTrustedBlockRoot
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elif config.lightClientTrustedBlockRoot.isSome:
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warn "Ignoring `lightClientTrustedBlockRoot`, light client not enabled",
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lightClientEnable = config.lightClientEnable.get,
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lightClientTrustedBlockRoot = config.lightClientTrustedBlockRoot
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node.lightClient = lightClient
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proc startLightClient*(node: BeaconNode) =
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if not node.config.lightClientEnable.get:
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return
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node.lightClient.start()
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proc installLightClientMessageValidators*(node: BeaconNode) =
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let eth2Processor =
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if node.config.serveLightClientData.get:
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# Process gossip using both full node and light client
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node.processor
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elif node.config.lightClientEnable.get:
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# Only process gossip using light client
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nil
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else:
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# Light client topics will never be subscribed to, no validators needed
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return
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node.lightClient.installMessageValidators(eth2Processor)
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proc updateLightClientGossipStatus*(
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node: BeaconNode, slot: Slot, dagIsBehind: bool) =
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let isBehind =
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if node.config.serveLightClientData.get:
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# Forward DAG's readiness to handle light client gossip
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dagIsBehind
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else:
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# Full node is not interested in gossip
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true
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node.lightClient.updateGossipStatus(slot, some isBehind)
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proc updateLightClientFromDag*(node: BeaconNode) =
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if not node.config.lightClientEnable.get:
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return
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if node.config.lightClientTrustedBlockRoot.isSome:
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return
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let
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dagHead = node.dag.finalizedHead
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dagPeriod = dagHead.slot.sync_committee_period
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if dagHead.slot < node.dag.cfg.ALTAIR_FORK_EPOCH.start_slot:
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return
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let lcHeader = node.lightClient.finalizedHeader
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if lcHeader.isSome:
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if dagPeriod <= lcHeader.get.slot.sync_committee_period:
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return
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let
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bdata = node.dag.getForkedBlock(dagHead.blck.bid).valueOr:
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return
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header = bdata.toBeaconBlockHeader
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current_sync_committee = block:
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var tmpState = assignClone(node.dag.headState)
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node.dag.currentSyncCommitteeForPeriod(tmpState[], dagPeriod).valueOr:
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return
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node.lightClient.resetToFinalizedHeader(header, current_sync_committee)
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