680 lines
24 KiB
Nim
680 lines
24 KiB
Nim
# beacon_chain
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# Copyright (c) 2021-2022 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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import std/[sets, sequtils]
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import chronicles
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import common, api, block_service
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const
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ServiceName = "duties_service"
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logScope: service = ServiceName
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type
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DutiesServiceLoop* = enum
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AttesterLoop, ProposerLoop, IndicesLoop, SyncCommitteeLoop,
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ProposerPreparationLoop
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chronicles.formatIt(DutiesServiceLoop):
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case it
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of AttesterLoop: "attester_loop"
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of ProposerLoop: "proposer_loop"
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of IndicesLoop: "index_loop"
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of SyncCommitteeLoop: "sync_committee_loop"
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of ProposerPreparationLoop: "proposer_prepare_loop"
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proc checkDuty(duty: RestAttesterDuty): bool =
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(duty.committee_length <= MAX_VALIDATORS_PER_COMMITTEE) and
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(uint64(duty.committee_index) < MAX_COMMITTEES_PER_SLOT) and
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(uint64(duty.validator_committee_index) < duty.committee_length) and
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(uint64(duty.validator_index) <= VALIDATOR_REGISTRY_LIMIT)
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proc checkSyncDuty(duty: RestSyncCommitteeDuty): bool =
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uint64(duty.validator_index) <= VALIDATOR_REGISTRY_LIMIT
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proc pollForValidatorIndices*(vc: ValidatorClientRef) {.async.} =
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let validatorIdents =
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block:
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var res: seq[ValidatorIdent]
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for validator in vc.attachedValidators[].items():
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if validator.index.isNone():
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res.add(ValidatorIdent.init(validator.pubkey))
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res
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var validators: seq[RestValidator]
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var offset = 0
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while offset < len(validatorIdents):
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let arraySize = min(MaximumValidatorIds, len(validatorIdents))
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let idents =
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block:
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var res = newSeq[ValidatorIdent](arraySize)
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var k = 0
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for i in offset ..< arraySize:
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res[k] = validatorIdents[i]
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inc(k)
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res
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let res =
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try:
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await vc.getValidators(idents, ApiStrategyKind.First)
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except ValidatorApiError:
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error "Unable to get head state's validator information"
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return
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except CancelledError as exc:
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debug "Validator's indices processing was interrupted"
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raise exc
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except CatchableError as exc:
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error "Unexpected error occurred while getting validator information",
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err_name = exc.name, err_msg = exc.msg
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return
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for item in res:
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validators.add(item)
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offset += arraySize
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var
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missing: seq[string]
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updated: seq[string]
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list: seq[AttachedValidator]
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for item in validators:
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var validator = vc.attachedValidators[].getValidator(item.validator.pubkey)
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if isNil(validator):
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missing.add(validatorLog(item.validator.pubkey, item.index))
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else:
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validator.index = Opt.some(item.index)
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validator.activationEpoch = Opt.some(item.validator.activation_epoch)
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updated.add(validatorLog(item.validator.pubkey, item.index))
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list.add(validator)
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if len(updated) > 0:
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info "Validator indices updated", missing_validators = len(missing),
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updated_validators = len(updated)
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trace "Validator indices update dump", missing_validators = missing,
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updated_validators = updated
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vc.indicesAvailable.fire()
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vc.addDoppelganger(list)
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proc pollForAttesterDuties*(vc: ValidatorClientRef,
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epoch: Epoch): Future[int] {.async.} =
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let validatorIndices =
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block:
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var res: seq[ValidatorIndex]
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for index in vc.attachedValidators[].indices():
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res.add(index)
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res
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if validatorIndices.len == 0:
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return 0
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var duties: seq[RestAttesterDuty]
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var currentRoot: Option[Eth2Digest]
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var offset = 0
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while offset < len(validatorIndices):
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let arraySize = min(MaximumValidatorIds, len(validatorIndices))
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let indices =
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block:
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var res = newSeq[ValidatorIndex](arraySize)
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var k = 0
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for i in offset ..< arraySize:
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res[k] = validatorIndices[i]
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inc(k)
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res
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let res =
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try:
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await vc.getAttesterDuties(epoch, indices, ApiStrategyKind.First)
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except ValidatorApiError:
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error "Unable to get attester duties", epoch = epoch
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return 0
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except CancelledError as exc:
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debug "Attester duties processing was interrupted"
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raise exc
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except CatchableError as exc:
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error "Unexpected error occured while getting attester duties",
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epoch = epoch, err_name = exc.name, err_msg = exc.msg
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return 0
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if currentRoot.isNone():
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# First request
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currentRoot = some(res.dependent_root)
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else:
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if currentRoot.get() != res.dependent_root:
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# `dependent_root` must be equal for all requests/response, if it got
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# changed it means that some reorg was happened in beacon node and we
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# should re-request all queries again.
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offset = 0
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duties.setLen(0)
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currentRoot = none[Eth2Digest]()
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continue
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for item in res.data:
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duties.add(item)
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offset += arraySize
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let
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relevantDuties = duties.filterIt(
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checkDuty(it) and (it.pubkey in vc.attachedValidators[])
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)
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genesisRoot = vc.beaconGenesis.genesis_validators_root
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let addOrReplaceItems =
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block:
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var alreadyWarned = false
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var res: seq[tuple[epoch: Epoch, duty: RestAttesterDuty]]
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for duty in relevantDuties:
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let map = vc.attesters.getOrDefault(duty.pubkey)
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let epochDuty = map.duties.getOrDefault(epoch, DefaultDutyAndProof)
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if not(epochDuty.isDefault()):
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if epochDuty.dependentRoot != currentRoot.get():
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res.add((epoch, duty))
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if not(alreadyWarned):
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warn "Attester duties re-organization",
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prior_dependent_root = epochDuty.dependentRoot,
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dependent_root = currentRoot.get()
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alreadyWarned = true
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else:
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info "Received new attester duty", duty, epoch = epoch,
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dependent_root = currentRoot.get()
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res.add((epoch, duty))
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res
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if len(addOrReplaceItems) > 0:
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var pendingRequests: seq[Future[SignatureResult]]
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var validators: seq[AttachedValidator]
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for item in addOrReplaceItems:
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let validator = vc.attachedValidators[].getValidator(item.duty.pubkey)
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let fork = vc.forkAtEpoch(item.duty.slot.epoch)
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let future = validator.getSlotSignature(
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fork, genesisRoot, item.duty.slot)
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pendingRequests.add(future)
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validators.add(validator)
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try:
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await allFutures(pendingRequests)
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except CancelledError as exc:
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var pendingCancel: seq[Future[void]]
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for future in pendingRequests:
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if not(future.finished()):
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pendingCancel.add(future.cancelAndWait())
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await allFutures(pendingCancel)
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raise exc
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for index, fut in pendingRequests:
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let item = addOrReplaceItems[index]
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let dap =
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if fut.done():
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let sigRes = fut.read()
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if sigRes.isErr():
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error "Unable to create slot signature using remote signer",
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validator = shortLog(validators[index]),
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error_msg = sigRes.error()
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DutyAndProof.init(item.epoch, currentRoot.get(), item.duty,
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none[ValidatorSig]())
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else:
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DutyAndProof.init(item.epoch, currentRoot.get(), item.duty,
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some(sigRes.get()))
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else:
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DutyAndProof.init(item.epoch, currentRoot.get(), item.duty,
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none[ValidatorSig]())
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var validatorDuties = vc.attesters.getOrDefault(item.duty.pubkey)
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validatorDuties.duties[item.epoch] = dap
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vc.attesters[item.duty.pubkey] = validatorDuties
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return len(addOrReplaceItems)
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proc pruneSyncCommitteeDuties*(vc: ValidatorClientRef, slot: Slot) =
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if slot.is_sync_committee_period():
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var newSyncCommitteeDuties: SyncCommitteeDutiesMap
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let epoch = slot.epoch()
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for key, item in vc.syncCommitteeDuties:
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var currentPeriodDuties = EpochSyncDuties()
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for epochKey, epochDuty in item.duties:
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if epochKey >= epoch:
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currentPeriodDuties.duties[epochKey] = epochDuty
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newSyncCommitteeDuties[key] = currentPeriodDuties
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vc.syncCommitteeDuties = newSyncCommitteeDuties
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proc pollForSyncCommitteeDuties*(vc: ValidatorClientRef,
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epoch: Epoch): Future[int] {.async.} =
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let validatorIndices = toSeq(vc.attachedValidators[].indices())
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var
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filteredDuties: seq[RestSyncCommitteeDuty]
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offset = 0
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remainingItems = len(validatorIndices)
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while offset < len(validatorIndices):
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let
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arraySize = min(MaximumValidatorIds, remainingItems)
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indices = validatorIndices[offset ..< (offset + arraySize)]
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res =
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try:
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await vc.getSyncCommitteeDuties(epoch, indices, ApiStrategyKind.First)
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except ValidatorApiError:
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error "Unable to get sync committee duties", epoch = epoch
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return 0
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except CancelledError as exc:
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debug "Sync committee duties processing was interrupted"
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raise exc
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except CatchableError as exc:
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error "Unexpected error occurred while getting sync committee duties",
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epoch = epoch, err_name = exc.name, err_msg = exc.msg
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return 0
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for item in res.data:
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if checkSyncDuty(item) and (item.pubkey in vc.attachedValidators[]):
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filteredDuties.add(item)
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offset += arraySize
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remainingItems -= arraySize
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let
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relevantDuties =
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block:
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var res: seq[SyncCommitteeDuty]
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for duty in filteredDuties:
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for validatorSyncCommitteeIndex in
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duty.validator_sync_committee_indices:
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res.add(SyncCommitteeDuty(
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pubkey: duty.pubkey,
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validator_index: duty.validator_index,
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validator_sync_committee_index: validatorSyncCommitteeIndex))
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res
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fork = vc.forkAtEpoch(epoch)
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genesisRoot = vc.beaconGenesis.genesis_validators_root
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let addOrReplaceItems =
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block:
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var alreadyWarned = false
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var res: seq[tuple[epoch: Epoch, duty: SyncCommitteeDuty]]
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for duty in relevantDuties:
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let map = vc.syncCommitteeDuties.getOrDefault(duty.pubkey)
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let epochDuty = map.duties.getOrDefault(epoch, DefaultSyncDutyAndProof)
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if epochDuty.isDefault():
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info "Received new sync committee duty", duty, epoch
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res.add((epoch, duty))
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else:
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if epochDuty.data != duty:
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if not(alreadyWarned):
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info "Sync committee duties re-organization", duty, epoch
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alreadyWarned = true
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res.add((epoch, duty))
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res
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if len(addOrReplaceItems) > 0:
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var pendingRequests: seq[Future[SignatureResult]]
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var validators: seq[AttachedValidator]
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let sres = vc.getCurrentSlot()
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if sres.isSome():
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for item in addOrReplaceItems:
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let validator = vc.attachedValidators[].getValidator(item.duty.pubkey)
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let future = validator.getSyncCommitteeSelectionProof(
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fork,
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genesisRoot,
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sres.get(),
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getSubcommitteeIndex(item.duty.validator_sync_committee_index))
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pendingRequests.add(future)
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validators.add(validator)
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try:
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await allFutures(pendingRequests)
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except CancelledError as exc:
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var pendingCancel: seq[Future[void]]
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for future in pendingRequests:
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if not(future.finished()):
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pendingCancel.add(future.cancelAndWait())
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await allFutures(pendingCancel)
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raise exc
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for index, fut in pendingRequests:
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let item = addOrReplaceItems[index]
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let dap =
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if fut.done():
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let sigRes = fut.read()
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if sigRes.isErr():
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error "Unable to create slot signature using remote signer",
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validator = shortLog(validators[index]),
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error_msg = sigRes.error()
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SyncDutyAndProof.init(item.epoch, item.duty,
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none[ValidatorSig]())
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else:
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SyncDutyAndProof.init(item.epoch, item.duty,
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some(sigRes.get()))
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else:
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SyncDutyAndProof.init(item.epoch, item.duty,
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none[ValidatorSig]())
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var validatorDuties =
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vc.syncCommitteeDuties.getOrDefault(item.duty.pubkey)
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validatorDuties.duties[item.epoch] = dap
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vc.syncCommitteeDuties[item.duty.pubkey] = validatorDuties
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return len(addOrReplaceItems)
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proc pruneAttesterDuties(vc: ValidatorClientRef, epoch: Epoch) =
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var attesters: AttesterMap
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for key, item in vc.attesters:
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var v = EpochDuties()
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for epochKey, epochDuty in item.duties:
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if (epochKey + HISTORICAL_DUTIES_EPOCHS) >= epoch:
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v.duties[epochKey] = epochDuty
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else:
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debug "Attester duties for the epoch has been pruned", validator = key,
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epoch = epochKey, loop = AttesterLoop
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attesters[key] = v
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vc.attesters = attesters
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proc pollForAttesterDuties*(vc: ValidatorClientRef) {.async.} =
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## Query the beacon node for attestation duties for all known validators.
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##
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## This function will perform (in the following order):
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##
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## 1. Poll for current-epoch duties and update the local `attesters` map.
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## 2. Poll for next-epoch duties and update the local `attesters` map.
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## 3. Push out any attestation subnet subscriptions to the BN.
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let sres = vc.getCurrentSlot()
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if sres.isSome():
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let
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currentSlot = sres.get()
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currentEpoch = currentSlot.epoch()
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nextEpoch = currentEpoch + 1'u64
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if vc.attachedValidators[].count() != 0:
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var counts: array[2, tuple[epoch: Epoch, count: int]]
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counts[0] = (currentEpoch, await vc.pollForAttesterDuties(currentEpoch))
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counts[1] = (nextEpoch, await vc.pollForAttesterDuties(nextEpoch))
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if (counts[0].count == 0) and (counts[1].count == 0):
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debug "No new attester's duties received", slot = currentSlot
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let subscriptions =
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block:
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var res: seq[RestCommitteeSubscription]
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for item in counts:
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if item.count > 0:
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for duty in vc.attesterDutiesForEpoch(item.epoch):
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if currentSlot + SUBSCRIPTION_BUFFER_SLOTS < duty.data.slot:
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let isAggregator =
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if duty.slotSig.isSome():
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is_aggregator(duty.data.committee_length,
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duty.slotSig.get())
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else:
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false
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let sub = RestCommitteeSubscription(
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validator_index: duty.data.validator_index,
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committee_index: duty.data.committee_index,
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committees_at_slot: duty.data.committees_at_slot,
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slot: duty.data.slot,
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is_aggregator: isAggregator
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)
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res.add(sub)
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res
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if len(subscriptions) > 0:
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let res = await vc.prepareBeaconCommitteeSubnet(subscriptions,
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ApiStrategyKind.First)
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if not(res):
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error "Failed to subscribe validators"
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vc.pruneAttesterDuties(currentEpoch)
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proc pollForSyncCommitteeDuties* (vc: ValidatorClientRef) {.async.} =
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let sres = vc.getCurrentSlot()
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if sres.isSome():
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let
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currentSlot = sres.get()
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currentEpoch = currentSlot.epoch()
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nextEpoch = currentEpoch + 1'u64
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if vc.attachedValidators[].count() != 0:
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var counts: array[2, tuple[epoch: Epoch, count: int]]
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counts[0] =
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(currentEpoch, await vc.pollForSyncCommitteeDuties(currentEpoch))
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counts[1] =
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(nextEpoch, await vc.pollForSyncCommitteeDuties(nextEpoch))
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if (counts[0].count == 0) and (counts[1].count == 0):
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debug "No new sync committee member's duties received",
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slot = currentSlot
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let subscriptions =
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block:
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var res: seq[RestSyncCommitteeSubscription]
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for item in counts:
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if item.count > 0:
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let subscriptionsInfo =
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vc.syncMembersSubscriptionInfoForEpoch(item.epoch)
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for subInfo in subscriptionsInfo:
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let sub = RestSyncCommitteeSubscription(
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validator_index: subInfo.validator_index,
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sync_committee_indices:
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subInfo.validator_sync_committee_indices,
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until_epoch:
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(currentEpoch + EPOCHS_PER_SYNC_COMMITTEE_PERIOD -
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currentEpoch.since_sync_committee_period_start()).Epoch
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)
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res.add(sub)
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res
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if len(subscriptions) > 0:
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let res = await vc.prepareSyncCommitteeSubnets(subscriptions,
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ApiStrategyKind.First)
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if not(res):
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error "Failed to subscribe validators"
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vc.pruneSyncCommitteeDuties(currentSlot)
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proc pruneBeaconProposers(vc: ValidatorClientRef, epoch: Epoch) =
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var proposers: ProposerMap
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for epochKey, data in vc.proposers:
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if (epochKey + HISTORICAL_DUTIES_EPOCHS) >= epoch:
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proposers[epochKey] = data
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else:
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debug "Proposer duty has been pruned", epoch = epochKey,
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loop = ProposerLoop
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vc.proposers = proposers
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proc pollForBeaconProposers*(vc: ValidatorClientRef) {.async.} =
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let sres = vc.getCurrentSlot()
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if sres.isSome():
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let
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currentSlot = sres.get()
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currentEpoch = currentSlot.epoch()
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if vc.attachedValidators[].count() != 0:
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try:
|
|
let res = await vc.getProposerDuties(currentEpoch,
|
|
ApiStrategyKind.First)
|
|
let
|
|
dependentRoot = res.dependent_root
|
|
duties = res.data
|
|
relevantDuties = duties.filterIt(it.pubkey in vc.attachedValidators[])
|
|
|
|
if len(relevantDuties) > 0:
|
|
vc.addOrReplaceProposers(currentEpoch, dependentRoot, relevantDuties)
|
|
else:
|
|
debug "No relevant proposer duties received", slot = currentSlot,
|
|
duties_count = len(duties)
|
|
except ValidatorApiError:
|
|
debug "Unable to get proposer duties", slot = currentSlot,
|
|
epoch = currentEpoch
|
|
except CancelledError as exc:
|
|
debug "Proposer duties processing was interrupted"
|
|
raise exc
|
|
except CatchableError as exc:
|
|
debug "Unexpected error occured while getting proposer duties",
|
|
slot = currentSlot, epoch = currentEpoch, err_name = exc.name,
|
|
err_msg = exc.msg
|
|
|
|
vc.pruneBeaconProposers(currentEpoch)
|
|
|
|
proc prepareBeaconProposers*(service: DutiesServiceRef) {.async.} =
|
|
let vc = service.client
|
|
let sres = vc.getCurrentSlot()
|
|
if sres.isSome():
|
|
let
|
|
currentSlot = sres.get()
|
|
currentEpoch = currentSlot.epoch()
|
|
proposers = vc.prepareProposersList(currentEpoch)
|
|
|
|
if len(proposers) > 0:
|
|
let count =
|
|
try:
|
|
await prepareBeaconProposer(vc, proposers)
|
|
except ValidatorApiError as exc:
|
|
warn "Unable to prepare beacon proposers", slot = currentSlot,
|
|
epoch = currentEpoch, err_name = exc.name,
|
|
err_msg = exc.msg
|
|
0
|
|
except CancelledError as exc:
|
|
debug "Beacon proposer preparation processing was interrupted"
|
|
raise exc
|
|
except CatchableError as exc:
|
|
error "Unexpected error occured while preparing beacon proposers",
|
|
slot = currentSlot, epoch = currentEpoch, err_name = exc.name,
|
|
err_msg = exc.msg
|
|
0
|
|
debug "Beacon proposers prepared",
|
|
validators_count = vc.attachedValidators[].count(),
|
|
proposers_count = len(proposers),
|
|
prepared_count = count
|
|
|
|
proc waitForNextSlot(service: DutiesServiceRef,
|
|
serviceLoop: DutiesServiceLoop) {.async.} =
|
|
let vc = service.client
|
|
let sleepTime = vc.beaconClock.durationToNextSlot()
|
|
await sleepAsync(sleepTime)
|
|
|
|
proc attesterDutiesLoop(service: DutiesServiceRef) {.async.} =
|
|
let vc = service.client
|
|
|
|
debug "Attester duties loop waiting for fork schedule update"
|
|
await vc.forksAvailable.wait()
|
|
doAssert(len(vc.forks) > 0, "Fork schedule must not be empty at this point")
|
|
while true:
|
|
await vc.pollForAttesterDuties()
|
|
await service.waitForNextSlot(AttesterLoop)
|
|
|
|
proc proposerDutiesLoop(service: DutiesServiceRef) {.async.} =
|
|
let vc = service.client
|
|
|
|
debug "Proposer duties loop waiting for fork schedule update"
|
|
await vc.forksAvailable.wait()
|
|
doAssert(len(vc.forks) > 0, "Fork schedule must not be empty at this point")
|
|
while true:
|
|
await vc.pollForBeaconProposers()
|
|
await service.waitForNextSlot(ProposerLoop)
|
|
|
|
proc validatorIndexLoop(service: DutiesServiceRef) {.async.} =
|
|
let vc = service.client
|
|
while true:
|
|
await vc.pollForValidatorIndices()
|
|
await service.waitForNextSlot(IndicesLoop)
|
|
|
|
proc proposerPreparationsLoop(service: DutiesServiceRef) {.async.} =
|
|
let vc = service.client
|
|
debug "Beacon proposer preparation loop waiting for validator indices update"
|
|
await vc.indicesAvailable.wait()
|
|
while true:
|
|
await service.prepareBeaconProposers()
|
|
await service.waitForNextSlot(ProposerPreparationLoop)
|
|
|
|
proc syncCommitteeDutiesLoop(service: DutiesServiceRef) {.async.} =
|
|
let vc = service.client
|
|
|
|
debug "Sync committee duties loop waiting for fork schedule update"
|
|
await vc.forksAvailable.wait()
|
|
doAssert(len(vc.forks) > 0, "Fork schedule must not be empty at this point")
|
|
while true:
|
|
await vc.pollForSyncCommitteeDuties()
|
|
await service.waitForNextSlot(SyncCommitteeLoop)
|
|
|
|
template checkAndRestart(serviceLoop: DutiesServiceLoop,
|
|
future: Future[void], body: untyped): untyped =
|
|
if future.finished():
|
|
if future.failed():
|
|
let error = future.readError()
|
|
debug "The loop ended unexpectedly with an error",
|
|
error_name = error.name, error_msg = error.msg, loop = serviceLoop
|
|
elif future.cancelled():
|
|
debug "The loop was interrupted", loop = serviceLoop
|
|
else:
|
|
debug "The loop is finished unexpectedly without an error",
|
|
loop = serviceLoop
|
|
future = body
|
|
|
|
proc mainLoop(service: DutiesServiceRef) {.async.} =
|
|
service.state = ServiceState.Running
|
|
debug "Service started"
|
|
|
|
var
|
|
attestFut = service.attesterDutiesLoop()
|
|
proposeFut = service.proposerDutiesLoop()
|
|
indicesFut = service.validatorIndexLoop()
|
|
syncFut = service.syncCommitteeDutiesLoop()
|
|
prepareFut = service.proposerPreparationsLoop()
|
|
|
|
while true:
|
|
# This loop could look much more nicer/better, when
|
|
# https://github.com/nim-lang/Nim/issues/19911 will be fixed, so it could
|
|
# become safe to combine loops, breaks and exception handlers.
|
|
let breakLoop =
|
|
try:
|
|
discard await race(attestFut, proposeFut, indicesFut, syncFut,
|
|
prepareFut)
|
|
checkAndRestart(AttesterLoop, attestFut, service.attesterDutiesLoop())
|
|
checkAndRestart(ProposerLoop, proposeFut, service.proposerDutiesLoop())
|
|
checkAndRestart(IndicesLoop, indicesFut, service.validatorIndexLoop())
|
|
checkAndRestart(SyncCommitteeLoop, syncFut,
|
|
service.syncCommitteeDutiesLoop())
|
|
checkAndRestart(ProposerPreparationLoop, prepareFut,
|
|
service.proposerPreparationsLoop())
|
|
false
|
|
except CancelledError:
|
|
debug "Service interrupted"
|
|
var pending: seq[Future[void]]
|
|
if not(attestFut.finished()):
|
|
pending.add(attestFut.cancelAndWait())
|
|
if not(proposeFut.finished()):
|
|
pending.add(proposeFut.cancelAndWait())
|
|
if not(indicesFut.finished()):
|
|
pending.add(indicesFut.cancelAndWait())
|
|
if not(syncFut.finished()):
|
|
pending.add(syncFut.cancelAndWait())
|
|
if not(prepareFut.finished()):
|
|
pending.add(prepareFut.cancelAndWait())
|
|
await allFutures(pending)
|
|
true
|
|
except CatchableError as exc:
|
|
warn "Service crashed with unexpected error", err_name = exc.name,
|
|
err_msg = exc.msg
|
|
true
|
|
|
|
if breakLoop:
|
|
break
|
|
|
|
proc init*(t: typedesc[DutiesServiceRef],
|
|
vc: ValidatorClientRef): Future[DutiesServiceRef] {.async.} =
|
|
logScope: service = ServiceName
|
|
let res = DutiesServiceRef(name: ServiceName,
|
|
client: vc, state: ServiceState.Initialized)
|
|
debug "Initializing service"
|
|
# We query for indices first, to avoid empty queries for duties.
|
|
await vc.pollForValidatorIndices()
|
|
return res
|
|
|
|
proc start*(service: DutiesServiceRef) =
|
|
service.lifeFut = mainLoop(service)
|