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# fluffy
# Copyright (c) 2022-2024 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: [].}
import
std/typetraits,
chronos,
chronicles,
stew/[base10, results],
eth/p2p/discoveryv5/random2,
beacon_chain/spec/datatypes/[phase0, altair, bellatrix, capella, deneb],
beacon_chain/spec/[forks_light_client, digest],
beacon_chain/beacon_clock,
beacon_chain/sync/light_client_sync_helpers,
"."/[beacon_network, beacon_content, beacon_db]
from beacon_chain/consensus_object_pools/block_pools_types import VerifierError
logScope:
topics = "beacon_lc_man"
type
Nothing = object
ResponseError = object of CatchableError
NetRes*[T] = Result[T, void]
Endpoint[K, V] = (K, V) # https://github.com/nim-lang/Nim/issues/19531
Bootstrap = Endpoint[Eth2Digest, ForkedLightClientBootstrap]
UpdatesByRange = Endpoint[
tuple[startPeriod: SyncCommitteePeriod, count: uint64], ForkedLightClientUpdate
]
FinalityUpdate = Endpoint[Slot, ForkedLightClientFinalityUpdate]
OptimisticUpdate = Endpoint[Slot, ForkedLightClientOptimisticUpdate]
ValueVerifier[V] =
proc(v: V): Future[Result[void, VerifierError]] {.gcsafe, raises: [].}
BootstrapVerifier* = ValueVerifier[ForkedLightClientBootstrap]
UpdateVerifier* = ValueVerifier[ForkedLightClientUpdate]
FinalityUpdateVerifier* = ValueVerifier[ForkedLightClientFinalityUpdate]
OptimisticUpdateVerifier* = ValueVerifier[ForkedLightClientOptimisticUpdate]
GetTrustedBlockRootCallback* = proc(): Option[Eth2Digest] {.gcsafe, raises: [].}
GetBoolCallback* = proc(): bool {.gcsafe, raises: [].}
GetSlotCallback* = proc(): Slot {.gcsafe, raises: [].}
LightClientManager* = object
network: BeaconNetwork
rng: ref HmacDrbgContext
getTrustedBlockRoot: GetTrustedBlockRootCallback
bootstrapVerifier: BootstrapVerifier
updateVerifier: UpdateVerifier
finalityUpdateVerifier: FinalityUpdateVerifier
optimisticUpdateVerifier: OptimisticUpdateVerifier
isLightClientStoreInitialized: GetBoolCallback
isNextSyncCommitteeKnown: GetBoolCallback
getFinalizedSlot: GetSlotCallback
getOptimisticSlot: GetSlotCallback
getBeaconTime: GetBeaconTimeFn
loopFuture: Future[void]
func init*(
T: type LightClientManager,
network: BeaconNetwork,
rng: ref HmacDrbgContext,
getTrustedBlockRoot: GetTrustedBlockRootCallback,
bootstrapVerifier: BootstrapVerifier,
updateVerifier: UpdateVerifier,
finalityUpdateVerifier: FinalityUpdateVerifier,
optimisticUpdateVerifier: OptimisticUpdateVerifier,
isLightClientStoreInitialized: GetBoolCallback,
isNextSyncCommitteeKnown: GetBoolCallback,
getFinalizedSlot: GetSlotCallback,
getOptimisticSlot: GetSlotCallback,
getBeaconTime: GetBeaconTimeFn,
): LightClientManager =
## Initialize light client manager.
LightClientManager(
network: network,
rng: rng,
getTrustedBlockRoot: getTrustedBlockRoot,
bootstrapVerifier: bootstrapVerifier,
updateVerifier: updateVerifier,
finalityUpdateVerifier: finalityUpdateVerifier,
optimisticUpdateVerifier: optimisticUpdateVerifier,
isLightClientStoreInitialized: isLightClientStoreInitialized,
isNextSyncCommitteeKnown: isNextSyncCommitteeKnown,
getFinalizedSlot: getFinalizedSlot,
getOptimisticSlot: getOptimisticSlot,
getBeaconTime: getBeaconTime,
)
proc getFinalizedPeriod(self: LightClientManager): SyncCommitteePeriod =
self.getFinalizedSlot().sync_committee_period
proc getOptimisticPeriod(self: LightClientManager): SyncCommitteePeriod =
self.getOptimisticSlot().sync_committee_period
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
proc doRequest(
e: typedesc[Bootstrap], n: BeaconNetwork, blockRoot: Eth2Digest
): Future[NetRes[ForkedLightClientBootstrap]] =
n.getLightClientBootstrap(blockRoot)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
type LightClientUpdatesByRangeResponse = NetRes[ForkedLightClientUpdateList]
proc doRequest(
e: typedesc[UpdatesByRange],
n: BeaconNetwork,
key: tuple[startPeriod: SyncCommitteePeriod, count: uint64],
): Future[LightClientUpdatesByRangeResponse] {.async.} =
let (startPeriod, count) = key
doAssert count > 0 and count <= MAX_REQUEST_LIGHT_CLIENT_UPDATES
let response = await n.getLightClientUpdatesByRange(startPeriod, count)
if response.isOk:
let e = distinctBase(response.get).checkLightClientUpdates(startPeriod, count)
if e.isErr:
raise newException(ResponseError, e.error)
return response
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
proc doRequest(
e: typedesc[FinalityUpdate], n: BeaconNetwork, finalizedSlot: Slot
): Future[NetRes[ForkedLightClientFinalityUpdate]] =
n.getLightClientFinalityUpdate(distinctBase(finalizedSlot))
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
proc doRequest(
e: typedesc[OptimisticUpdate], n: BeaconNetwork, optimisticSlot: Slot
): Future[NetRes[ForkedLightClientOptimisticUpdate]] =
n.getLightClientOptimisticUpdate(distinctBase(optimisticSlot))
template valueVerifier[E](
self: LightClientManager, e: typedesc[E]
): ValueVerifier[E.V] =
when E.V is ForkedLightClientBootstrap:
self.bootstrapVerifier
elif E.V is ForkedLightClientUpdate:
self.updateVerifier
elif E.V is ForkedLightClientFinalityUpdate:
self.finalityUpdateVerifier
elif E.V is ForkedLightClientOptimisticUpdate:
self.optimisticUpdateVerifier
else:
static:
doAssert false
iterator values(v: auto): auto =
## Local helper for `workerTask` to share the same implementation for both
## scalar and aggregate values, by treating scalars as 1-length aggregates.
when v is List:
for i in v:
yield i
else:
yield v
proc workerTask[E](
self: LightClientManager, e: typedesc[E], key: E.K
): Future[bool] {.async.} =
var didProgress = false
try:
let value =
when E.K is Nothing:
await E.doRequest(self.network)
else:
await E.doRequest(self.network, key)
if value.isOk:
for val in value.get().values:
let res = await self.valueVerifier(E)(val)
if res.isErr:
case res.error
of VerifierError.MissingParent:
# Stop, requires different request to progress
return didProgress
of VerifierError.Duplicate:
# Ignore, a concurrent request may have already fulfilled this
when E.V is ForkedLightClientBootstrap:
didProgress = true
else:
discard
of VerifierError.UnviableFork:
withForkyObject(val):
when lcDataFork > LightClientDataFork.None:
notice "Received value from an unviable fork",
value = forkyObject, endpoint = E.name
else:
notice "Received value from an unviable fork", endpoint = E.name
return didProgress
of VerifierError.Invalid:
withForkyObject(val):
when lcDataFork > LightClientDataFork.None:
warn "Received invalid value",
value = forkyObject.shortLog, endpoint = E.name
else:
warn "Received invalid value", endpoint = E.name
return didProgress
else:
# TODO:
# This is data coming from either the network or the database.
# Either way it comes in encoded and is passed along till here in its
# decoded format. It only gets stored in the database here as it is
# required to pass validation first ( didprogress == true). Next it
# gets encoded again before dropped in the database. Optimisations
# are possible here if the beacon_light_client_manager and the
# manager are better interfaced with each other.
when E.V is ForkedLightClientBootstrap:
withForkyObject(val):
when lcDataFork > LightClientDataFork.None:
self.network.beaconDb.putBootstrap(key, val)
else:
notice "Received value from an unviable fork", endpoint = E.name
elif E.V is ForkedLightClientUpdate:
withForkyObject(val):
when lcDataFork > LightClientDataFork.None:
let period =
forkyObject.attested_header.beacon.slot.sync_committee_period
self.network.beaconDb.putUpdateIfBetter(period, val)
else:
notice "Received value from an unviable fork", endpoint = E.name
didProgress = true
else:
debug "Failed to receive value on request", value, endpoint = E.name
except ResponseError as exc:
warn "Received invalid response", error = exc.msg, endpoint = E.name
except CancelledError as exc:
raise exc
except CatchableError as exc:
debug "Unexpected exception while receiving value", exc = exc.msg
raise exc
return didProgress
proc query[E](self: LightClientManager, e: typedesc[E], key: E.K): Future[bool] =
# Note:
# The libp2p version does concurrent requests here. But it seems to be done
# for the same key and thus as redundant request to avoid waiting on a not
# responding peer.
# In Portal this is already build into the lookups and thus not really
# needed. On difference important is that the lookup concurrent requests are
# already getting canceled when 1 peer returns the content but before the
# content gets validated. This is improvement to do for all Portal content
# requests however, see: https://github.com/status-im/nimbus-eth1/issues/1769
self.workerTask(e, key)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/light-client.md#light-client-sync-process
proc loop(self: LightClientManager) {.async.} =
var nextSyncTaskTime = self.getBeaconTime()
while true:
# Periodically wake and check for changes
let wallTime = self.getBeaconTime()
if wallTime < nextSyncTaskTime:
await sleepAsync(chronos.seconds(2))
continue
# Obtain bootstrap data once a trusted block root is supplied
if not self.isLightClientStoreInitialized():
let trustedBlockRoot = self.getTrustedBlockRoot()
if trustedBlockRoot.isNone:
await sleepAsync(chronos.seconds(2))
continue
let didProgress = await self.query(Bootstrap, trustedBlockRoot.get)
nextSyncTaskTime =
if didProgress:
wallTime
else:
wallTime + self.rng.computeDelayWithJitter(chronos.seconds(0))
continue
# Fetch updates
let
current = wallTime.slotOrZero().sync_committee_period
syncTask = nextLightClientSyncTask(
current = current,
finalized = self.getFinalizedPeriod(),
optimistic = self.getOptimisticPeriod(),
isNextSyncCommitteeKnown = self.isNextSyncCommitteeKnown(),
)
didProgress =
case syncTask.kind
of LcSyncKind.UpdatesByRange:
await self.query(
UpdatesByRange, (startPeriod: syncTask.startPeriod, count: syncTask.count)
)
of LcSyncKind.FinalityUpdate:
let finalizedSlot = start_slot(epoch(wallTime.slotOrZero()) - 2)
await self.query(FinalityUpdate, finalizedSlot)
of LcSyncKind.OptimisticUpdate:
let optimisticSlot = wallTime.slotOrZero()
await self.query(OptimisticUpdate, optimisticSlot)
nextSyncTaskTime =
wallTime +
self.rng.nextLcSyncTaskDelay(
wallTime,
finalized = self.getFinalizedPeriod(),
optimistic = self.getOptimisticPeriod(),
isNextSyncCommitteeKnown = self.isNextSyncCommitteeKnown(),
didLatestSyncTaskProgress = didProgress,
)
proc start*(self: var LightClientManager) =
## Start light client manager's loop.
doAssert self.loopFuture == nil
self.loopFuture = self.loop()
proc stop*(self: var LightClientManager) {.async.} =
## Stop light client manager's loop.
if self.loopFuture != nil:
await self.loopFuture.cancelAndWait()
self.loopFuture = nil
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