120 lines
4.1 KiB
Nim
120 lines
4.1 KiB
Nim
# beacon_chain
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# Copyright (c) 2022-2024 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: [].}
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import chronicles
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import "."/[common, api]
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const
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ServiceName = "doppelganger_service"
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logScope: service = ServiceName
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proc getCheckingList*(vc: ValidatorClientRef, epoch: Epoch): seq[ValidatorIndex] =
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var res: seq[ValidatorIndex]
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for validator in vc.attachedValidators[]:
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if validator.index.isSome and
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(validator.doppelCheck.isNone or validator.doppelCheck.get() < epoch):
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res.add validator.index.get()
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res
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proc processActivities(service: DoppelgangerServiceRef, epoch: Epoch,
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activities: GetValidatorsLivenessResponse) =
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let vc = service.client
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if len(activities.data) == 0:
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debug "Unable to monitor validator's activity for epoch", epoch = epoch
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else:
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for item in activities.data:
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let vindex = item.index
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for validator in vc.attachedValidators[]:
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if validator.index == Opt.some(vindex):
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validator.doppelgangerChecked(epoch)
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if item.is_live and validator.triggersDoppelganger(epoch):
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warn "Doppelganger detection triggered",
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validator = validatorLog(validator), epoch
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vc.doppelExit.fire()
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return
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break
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proc mainLoop(service: DoppelgangerServiceRef) {.async.} =
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let vc = service.client
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service.state = ServiceState.Running
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if service.enabled:
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debug "Service started"
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else:
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debug "Service disabled because of configuration settings"
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return
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debug "Doppelganger detection loop is waiting for initialization"
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try:
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await allFutures(
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vc.preGenesisEvent.wait(),
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vc.genesisEvent.wait(),
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vc.indicesAvailable.wait()
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)
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except CancelledError:
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debug "Service interrupted"
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return
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except CatchableError as exc:
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warn "Service crashed with unexpected error", err_name = exc.name,
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err_msg = exc.msg
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return
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# On (re)start, we skip the remainder of the epoch before we start monitoring
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# for doppelgangers so we don't trigger on the attestations we produced before
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# the epoch - there's no activity in the genesis slot, so if we start at or
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# before that, we can safely perform the check for epoch 0 and thus keep
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# validating in epoch 1
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if vc.beaconClock.now().slotOrZero() > GENESIS_SLOT:
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await service.waitForNextEpoch(TIME_DELAY_FROM_SLOT)
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while try:
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# Wait for the epoch to end - at the end (or really, the beginning of the
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# next one, we ask what happened
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await service.waitForNextEpoch(TIME_DELAY_FROM_SLOT)
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let
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currentEpoch = vc.currentSlot().epoch()
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previousEpoch =
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if currentEpoch == Epoch(0):
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currentEpoch
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else:
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currentEpoch - 1'u64
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validators = vc.getCheckingList(previousEpoch)
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if len(validators) > 0:
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let activities = await vc.getValidatorsLiveness(previousEpoch,
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validators)
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service.processActivities(previousEpoch, activities)
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else:
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debug "No validators found that require doppelganger protection"
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discard
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true
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except CancelledError:
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debug "Service interrupted"
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false
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except CatchableError as exc:
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warn "Service crashed with unexpected error", err_name = exc.name,
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err_msg = exc.msg
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false
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: discard
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proc init*(t: type DoppelgangerServiceRef,
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vc: ValidatorClientRef): Future[DoppelgangerServiceRef] {.async.} =
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logScope: service = ServiceName
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let res = DoppelgangerServiceRef(name: ServiceName,
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client: vc, state: ServiceState.Initialized,
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enabled: vc.config.doppelgangerDetection)
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debug "Initializing service"
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return res
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proc start*(service: DoppelgangerServiceRef) =
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service.lifeFut = mainLoop(service)
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