nimbus-eth2/beacon_chain/beacon_node_light_client.nim

104 lines
3.4 KiB
Nim

# beacon_chain
# 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].}
# This implements the pre-release proposal of the libp2p based light client sync
# protocol. See https://github.com/ethereum/consensus-specs/pull/2802
import
chronicles,
./beacon_node
logScope: topics = "beacnde"
proc initLightClient*(
node: BeaconNode,
rng: ref BrHmacDrbgContext,
cfg: RuntimeConfig,
forkDigests: ref ForkDigests,
getBeaconTime: GetBeaconTimeFn,
genesis_validators_root: Eth2Digest) =
template config(): auto = node.config
# Creating a light client is not dependent on `lightClientEnable`
# because the light client module also handles gossip subscriptions
# for broadcasting light client data as a server.
let lightClient = createLightClient(
node.network, rng, config, cfg,
forkDigests, getBeaconTime, genesis_validators_root)
if config.lightClientEnable.get:
lightClient.trustedBlockRoot = config.lightClientTrustedBlockRoot
elif config.lightClientTrustedBlockRoot.isSome:
warn "Ignoring `lightClientTrustedBlockRoot`, light client not enabled",
lightClientEnable = config.lightClientEnable.get,
lightClientTrustedBlockRoot = config.lightClientTrustedBlockRoot
node.lightClient = lightClient
proc startLightClient*(node: BeaconNode) =
if not node.config.lightClientEnable.get:
return
node.lightClient.start()
proc installLightClientMessageValidators*(node: BeaconNode) =
let eth2Processor =
if node.config.serveLightClientData.get:
# Process gossip using both full node and light client
node.processor
elif node.config.lightClientEnable.get:
# Only process gossip using light client
nil
else:
# Light client topics will never be subscribed to, no validators needed
return
node.lightClient.installMessageValidators(eth2Processor)
proc updateLightClientGossipStatus*(
node: BeaconNode, slot: Slot, dagIsBehind: bool) =
let isBehind =
if node.config.serveLightClientData.get:
# Forward DAG's readiness to handle light client gossip
dagIsBehind
else:
# Full node is not interested in gossip
true
node.lightClient.updateGossipStatus(slot, some isBehind)
proc updateLightClientFromDag*(node: BeaconNode) =
if not node.config.lightClientEnable.get:
return
if node.config.lightClientTrustedBlockRoot.isSome:
return
let
dagHead = node.dag.finalizedHead
dagPeriod = dagHead.slot.sync_committee_period
if dagHead.slot < node.dag.cfg.ALTAIR_FORK_EPOCH.start_slot:
return
let lcHeader = node.lightClient.finalizedHeader
if lcHeader.isSome:
if dagPeriod <= lcHeader.get.slot.sync_committee_period:
return
let
bdata = node.dag.getForkedBlock(dagHead.blck.bid).valueOr:
return
header = bdata.toBeaconBlockHeader
current_sync_committee = block:
var tmpState = assignClone(node.dag.headState)
node.dag.currentSyncCommitteeForPeriod(tmpState[], dagPeriod).valueOr:
return
node.lightClient.resetToFinalizedHeader(header, current_sync_committee)