import std/[sets, sequtils] import chronicles import common, api, block_service logScope: service = "attestation_service" type AggregateItem* = object aggregator_index: uint64 selection_proof: ValidatorSig validator: AttachedValidator proc serveAttestation(service: AttestationServiceRef, adata: AttestationData, duty: DutyAndProof): Future[bool] {.async.} = let vc = service.client let validator = block: let res = vc.getValidator(duty.data.pubkey) if res.isNone(): return false res.get() let fork = vc.fork.get() # TODO: signing_root is recomputed in signBlockProposal just after, # but not for locally attached validators. let signingRoot = compute_attestation_root(fork, vc.beaconGenesis.genesis_validators_root, adata) let vindex = validator.index.get() let notSlashable = vc.attachedValidators.slashingProtection .registerAttestation(vindex, validator.pubKey, adata.source.epoch, adata.target.epoch, signingRoot) if notSlashable.isErr(): warn "Slashing protection activated for attestation", slot = duty.data.slot, validator = shortLog(validator), validator_index = vindex, badVoteDetails = $notSlashable.error return false let attestation = await validator.produceAndSignAttestation(adata, int(duty.data.committee_length), Natural(duty.data.validator_committee_index), fork, vc.beaconGenesis.genesis_validators_root) let res = try: await vc.submitPoolAttestations(@[attestation]) except ValidatorApiError: error "Unable to publish attestation", attestation = shortLog(attestation), validator = shortLog(validator), validator_index = vindex return false except CatchableError as exc: error "Unexpected error occured while publishing attestation", attestation = shortLog(attestation), validator = shortLog(validator), validator_index = vindex, err_name = exc.name, err_msg = exc.msg return false let delay = vc.getDelay(seconds(int64(SECONDS_PER_SLOT) div 3)) let indexInCommittee = duty.data.validator_committee_index if res: notice "Attestation published", attestation = shortLog(attestation), validator = shortLog(validator), validator_index = vindex, delay = delay, indexInCommittee = indexInCommittee else: warn "Attestation was not accepted by beacon node", attestation = shortLog(attestation), validator = shortLog(validator), validator_index = vindex, delay = delay, indexInCommittee = indexInCommittee return res proc serveAggregateAndProof*(service: AttestationServiceRef, proof: AggregateAndProof, validator: AttachedValidator): Future[bool] {. async.} = let vc = service.client genesisRoot = vc.beaconGenesis.genesis_validators_root fork = vc.fork.get() let signature = await signAggregateAndProof(validator, proof, fork, genesisRoot) let signedProof = SignedAggregateAndProof(message: proof, signature: signature) let aggregationSlot = proof.aggregate.data.slot let vindex = validator.index.get() let res = try: await vc.publishAggregateAndProofs(@[signedProof]) except ValidatorApiError: error "Unable to publish aggregated attestation", attestation = shortLog(signedProof.message.aggregate), validator = shortLog(validator), aggregationSlot = aggregationSlot, validator_index = vindex return false except CatchableError as exc: error "Unexpected error occured while publishing aggregated attestation", attestation = shortLog(signedProof.message.aggregate), validator = shortLog(validator), aggregationSlot = aggregationSlot, validator_index = vindex, err_name = exc.name, err_msg = exc.msg return false if res: notice "Aggregated attestation published", attestation = shortLog(signedProof.message.aggregate), validator = shortLog(validator), aggregationSlot = aggregationSlot, validator_index = vindex else: warn "Aggregated attestation was not accepted by beacon node", attestation = shortLog(signedProof.message.aggregate), validator = shortLog(validator), aggregationSlot = aggregationSlot, validator_index = vindex return res proc produceAndPublishAttestations*(service: AttestationServiceRef, slot: Slot, committee_index: CommitteeIndex, duties: seq[DutyAndProof] ): Future[AttestationData] {. async.} = doAssert(MAX_VALIDATORS_PER_COMMITTEE <= uint64(high(int))) let vc = service.client # This call could raise ValidatorApiError, but it is handled in # publishAttestationsAndAggregates(). let ad = await vc.produceAttestationData(slot, committee_index) let pendingAttestations = block: var res: seq[Future[bool]] for duty in duties: debug "Serving attestation duty", duty = duty.data, epoch = slot.epoch() if (duty.data.slot != ad.slot) or (uint64(duty.data.committee_index) != ad.index): error "Inconsistent validator duties during attestation signing", validator = shortLog(duty.data.pubkey), duty_slot = duty.data.slot, duty_index = duty.data.committee_index, attestation_slot = ad.slot, attestation_index = ad.index continue res.add(service.serveAttestation(ad, duty)) res let statistics = block: var errored, succeed, failed = 0 try: await allFutures(pendingAttestations) except CancelledError: for fut in pendingAttestations: if not(fut.finished()): fut.cancel() await allFutures(pendingAttestations) for future in pendingAttestations: if future.done(): if future.read(): inc(succeed) else: inc(failed) else: inc(errored) (succeed, errored, failed) let delay = vc.getDelay(seconds(int64(SECONDS_PER_SLOT) div 3)) debug "Attestation statistics", total = len(pendingAttestations), succeed = statistics[0], failed_to_deliver = statistics[1], not_accepted = statistics[2], delay = delay, slot = slot, committee_index = committeeIndex, duties_count = len(duties) return ad proc produceAndPublishAggregates(service: AttestationServiceRef, adata: AttestationData, duties: seq[DutyAndProof]) {.async.} = let vc = service.client slot = adata.slot committeeIndex = CommitteeIndex(adata.index) attestationRoot = adata.hash_tree_root() genesisRoot = vc.beaconGenesis.genesis_validators_root let aggregateItems = block: var res: seq[AggregateItem] for duty in duties: let validator = vc.attachedValidators.getValidator(duty.data.pubkey) if not(isNil(validator)): if (duty.data.slot != slot) or (duty.data.committee_index != committeeIndex): error "Inconsistent validator duties during aggregate signing", duty_slot = duty.data.slot, slot = slot, duty_committee_index = duty.data.committee_index, committee_index = committeeIndex continue if duty.slotSig.isSome(): let slotSignature = duty.slotSig.get() if is_aggregator(duty.data.committee_length, slotSignature): res.add(AggregateItem( aggregator_index: uint64(duty.data.validator_index), selection_proof: slotSignature, validator: validator )) res if len(aggregateItems) > 0: let aggAttestation = try: await vc.getAggregatedAttestation(slot, attestationRoot) except ValidatorApiError: error "Unable to get aggregated attestation data", slot = slot, attestation_root = shortLog(attestationRoot) return except CatchableError as exc: error "Unexpected error occured while getting aggregated attestation", slot = slot, attestation_root = shortLog(attestationRoot), err_name = exc.name, err_msg = exc.msg return let pendingAggregates = block: var res: seq[Future[bool]] for item in aggregateItems: let proof = AggregateAndProof( aggregator_index: item.aggregator_index, aggregate: aggAttestation, selection_proof: item.selection_proof ) res.add(service.serveAggregateAndProof(proof, item.validator)) res let statistics = block: var errored, succeed, failed = 0 try: await allFutures(pendingAggregates) except CancelledError: for fut in pendingAggregates: if not(fut.finished()): fut.cancel() await allFutures(pendingAggregates) for future in pendingAggregates: if future.done(): if future.read(): inc(succeed) else: inc(failed) else: inc(errored) (succeed, errored, failed) let delay = vc.getDelay(seconds((int64(SECONDS_PER_SLOT) div 3) * 2)) debug "Aggregated attestation statistics", total = len(pendingAggregates), succeed = statistics[0], failed_to_deliver = statistics[1], not_accepted = statistics[2], delay = delay, slot = slot, committee_index = committeeIndex else: debug "No aggregate and proofs scheduled for slot", slot = slot, committee_index = committeeIndex proc publishAttestationsAndAggregates(service: AttestationServiceRef, slot: Slot, committee_index: CommitteeIndex, duties: seq[DutyAndProof]) {.async.} = let vc = service.client let aggregateTime = # chronos.Duration substraction could not return negative value, in such # case it will return `ZeroDuration`. vc.beaconClock.durationToNextSlot() - seconds(int64(SECONDS_PER_SLOT) div 3) # Waiting for blocks to be published before attesting. # TODO (cheatfate): Here should be present timeout. let startTime = Moment.now() await vc.waitForBlockPublished(slot) let dur = Moment.now() - startTime debug "Block proposal awaited", slot = slot, duration = dur block: let delay = vc.getDelay(seconds(int64(SECONDS_PER_SLOT) div 3)) debug "Producing attestations", delay = delay, slot = slot, committee_index = committee_index, duties_count = len(duties) let ad = try: await service.produceAndPublishAttestations(slot, committee_index, duties) except ValidatorApiError: error "Unable to proceed attestations", slot = slot, committee_index = committee_index, duties_count = len(duties) return except CatchableError as exc: error "Unexpected error while producing attestations", slot = slot, committee_index = committee_index, duties_count = len(duties), err_name = exc.name, err_msg = exc.msg return if aggregateTime != ZeroDuration: await sleepAsync(aggregateTime) block: let delay = vc.getDelay(seconds((int64(SECONDS_PER_SLOT) div 3) * 2)) debug "Producing aggregate and proofs", delay = delay await service.produceAndPublishAggregates(ad, duties) proc spawnAttestationTasks(service: AttestationServiceRef, slot: Slot) = let vc = service.client let dutiesByCommittee = block: var res: Table[CommitteeIndex, seq[DutyAndProof]] let attesters = vc.getAttesterDutiesForSlot(slot) var default: seq[DutyAndProof] for item in attesters: res.mgetOrPut(item.data.committee_index, default).add(item) res for index, duties in dutiesByCommittee.pairs(): if len(duties) > 0: asyncSpawn service.publishAttestationsAndAggregates(slot, index, duties) proc mainLoop(service: AttestationServiceRef) {.async.} = let vc = service.client service.state = ServiceState.Running try: while true: let sleepTime = vc.beaconClock.durationToNextSlot() + seconds(int64(SECONDS_PER_SLOT) div 3) let sres = vc.getCurrentSlot() if sres.isSome(): let currentSlot = sres.get() service.spawnAttestationTasks(currentSlot) await sleepAsync(sleepTime) except CatchableError as exc: warn "Service crashed with unexpected error", err_name = exc.name, err_msg = exc.msg proc init*(t: typedesc[AttestationServiceRef], vc: ValidatorClientRef): Future[AttestationServiceRef] {.async.} = debug "Initializing service" var res = AttestationServiceRef(client: vc, state: ServiceState.Initialized) return res proc start*(service: AttestationServiceRef) = service.lifeFut = mainLoop(service)