nimbus-eth2/tests/test_light_client.nim

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# beacon_chain
# Copyright (c) 2021-2022 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.
{.used.}
# This implements the pre-release proposal of the libp2p based light client sync
# protocol. See https://github.com/ethereum/consensus-specs/pull/2802
import
# Status libraries
chronicles, eth/keys, stew/objects, taskpools,
# Beacon chain internals
../beacon_chain/consensus_object_pools/
[block_clearance, block_quarantine, blockchain_dag],
../beacon_chain/spec/[forks, helpers, light_client_sync, state_transition],
# Test utilities
./testutil, ./testdbutil
suite "Light client" & preset():
let
cfg = block:
var res = defaultRuntimeConfig
res.ALTAIR_FORK_EPOCH = GENESIS_EPOCH + 1
res
altairStartSlot = cfg.ALTAIR_FORK_EPOCH.start_slot
proc advanceToSlot(
dag: ChainDAGRef,
targetSlot: Slot,
verifier: var BatchVerifier,
quarantine: var Quarantine,
attested = true,
syncCommitteeRatio = 0.75) =
var cache: StateCache
const maxAttestedSlotsPerPeriod = 3 * SLOTS_PER_EPOCH
while true:
var slot = getStateField(dag.headState, slot)
doAssert targetSlot >= slot
if targetSlot == slot: break
# When there is a large jump, skip to the end of the current period,
# create blocks for a few epochs to finalize it, then proceed
let
nextPeriod = slot.sync_committee_period + 1
periodEpoch = nextPeriod.start_epoch
periodSlot = periodEpoch.start_slot
checkpointSlot = periodSlot - maxAttestedSlotsPerPeriod
if targetSlot > checkpointSlot and checkpointSlot > dag.head.slot:
var info: ForkedEpochInfo
doAssert process_slots(cfg, dag.headState, checkpointSlot,
cache, info, flags = {}).isOk()
slot = checkpointSlot
# Create blocks for final few epochs
let blocks = min(targetSlot - slot, maxAttestedSlotsPerPeriod)
for blck in makeTestBlocks(dag.headState, cache, blocks.int,
attested, syncCommitteeRatio, cfg):
let added =
case blck.kind
of BeaconBlockFork.Phase0:
const nilCallback = OnPhase0BlockAdded(nil)
dag.addHeadBlock(verifier, blck.phase0Data, nilCallback)
of BeaconBlockFork.Altair:
const nilCallback = OnAltairBlockAdded(nil)
dag.addHeadBlock(verifier, blck.altairData, nilCallback)
of BeaconBlockFork.Bellatrix:
const nilCallback = OnBellatrixBlockAdded(nil)
dag.addHeadBlock(verifier, blck.bellatrixData, nilCallback)
check: added.isOk()
dag.updateHead(added[], quarantine)
setup:
const num_validators = SLOTS_PER_EPOCH
let
validatorMonitor = newClone(ValidatorMonitor.init())
dag = ChainDAGRef.init(
cfg, makeTestDB(num_validators), validatorMonitor, {},
serveLightClientData = true,
importLightClientData = ImportLightClientData.OnlyNew)
quarantine = newClone(Quarantine.init())
taskpool = TaskPool.new()
var verifier = BatchVerifier(rng: keys.newRng(), taskpool: taskpool)
test "Pre-Altair":
# Genesis
check:
dag.headState.kind == BeaconStateFork.Phase0
dag.getBestLightClientUpdateForPeriod(0.SyncCommitteePeriod).isNone
dag.getLatestLightClientUpdate.isNone
# Advance to last slot before Altair
dag.advanceToSlot(altairStartSlot - 1, verifier, quarantine[])
check:
dag.headState.kind == BeaconStateFork.Phase0
dag.getBestLightClientUpdateForPeriod(0.SyncCommitteePeriod).isNone
dag.getLatestLightClientUpdate.isNone
# Advance to Altair
dag.advanceToSlot(altairStartSlot, verifier, quarantine[])
check:
dag.headState.kind == BeaconStateFork.Altair
dag.getBestLightClientUpdateForPeriod(0.SyncCommitteePeriod).isNone
dag.getLatestLightClientUpdate.isNone
test "Light client sync":
# Advance to Altair
dag.advanceToSlot(altairStartSlot, verifier, quarantine[])
# Track trusted checkpoint for light client
let
genesis_validators_root = dag.genesisValidatorsRoot
trusted_block_root = dag.head.root
# Advance to target slot
const
headPeriod = 2.SyncCommitteePeriod
periodEpoch = headPeriod.start_epoch
headSlot = (periodEpoch + 2).start_slot + 5
dag.advanceToSlot(headSlot, verifier, quarantine[])
let currentSlot = getStateField(dag.headState, slot)
# Initialize light client store
let bootstrap = dag.getLightClientBootstrap(trusted_block_root)
check bootstrap.isSome
var storeRes = initialize_light_client_store(
trusted_block_root, bootstrap.get)
check storeRes.isOk
template store(): auto = storeRes.get
# Sync to latest sync committee period
var numIterations = 0
while store.finalized_header.slot.sync_committee_period + 1 < headPeriod:
let
period =
if store.next_sync_committee.isZeroMemory:
store.finalized_header.slot.sync_committee_period
else:
store.finalized_header.slot.sync_committee_period + 1
bestUpdate = dag.getBestLightClientUpdateForPeriod(period)
res = process_light_client_update(
store, bestUpdate.get, currentSlot, cfg, genesis_validators_root)
check:
bestUpdate.isSome
bestUpdate.get.finalized_header.slot.sync_committee_period == period
res.isOk
store.finalized_header == bestUpdate.get.finalized_header
inc numIterations
if numIterations > 20: doAssert false # Avoid endless loop on test failure
# Sync to latest update
let
latestUpdate = dag.getLatestLightClientUpdate
res = process_light_client_update(
store, latestUpdate.get, currentSlot, cfg, genesis_validators_root)
check:
latestUpdate.isSome
latestUpdate.get.attested_header.slot == dag.head.parent.slot
res.isOk
store.finalized_header == latestUpdate.get.finalized_header
store.optimistic_header == latestUpdate.get.attested_header
test "Init from checkpoint":
# Fetch genesis state
let genesisState = assignClone dag.headState
# Advance to target slot for checkpoint
let finalizedSlot =
((altairStartSlot.sync_committee_period + 1).start_epoch + 2).start_slot
dag.advanceToSlot(finalizedSlot, verifier, quarantine[])
# Initialize new DAG from checkpoint
let cpDb = BeaconChainDB.new("", inMemory = true)
ChainDAGRef.preInit(
cpDB, genesisState[],
dag.headState, dag.getForkedBlock(dag.head.bid).get)
let cpDag = ChainDAGRef.init(
cfg, cpDb, validatorMonitor, {},
serveLightClientData = true,
importLightClientData = ImportLightClientData.Full)
# Advance by a couple epochs
for i in 1'u64 .. 10:
let headSlot = (finalizedSlot.epoch + i).start_slot
cpDag.advanceToSlot(headSlot, verifier, quarantine[])
check true