# beacon_chain # Copyright (c) 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. import std/sets, metrics, chronicles, ../spec/datatypes/[phase0, altair, bellatrix], ../spec/eth2_apis/rest_types, ../validators/activity_metrics, "."/[common, api, block_service] const ServiceName = "sync_committee_service" logScope: service = ServiceName type ContributionItem* = object aggregator_index: uint64 selection_proof: ValidatorSig validator: AttachedValidator subcommitteeIdx: SyncSubcommitteeIndex proc serveSyncCommitteeMessage*(service: SyncCommitteeServiceRef, slot: Slot, beaconBlockRoot: Eth2Digest, duty: SyncCommitteeDuty): Future[bool] {. async.} = let vc = service.client fork = vc.forkAtEpoch(slot.epoch) genesisValidatorsRoot = vc.beaconGenesis.genesis_validators_root vindex = duty.validator_index subcommitteeIdx = getSubcommitteeIndex( duty.validator_sync_committee_index) validator = vc.getValidatorForDuties(duty.pubkey, slot).valueOr: return false message = block: let res = await getSyncCommitteeMessage(validator, fork, genesisValidatorsRoot, slot, beaconBlockRoot) if res.isErr(): error "Unable to sign committee message using remote signer", validator = shortLog(validator), slot = slot, block_root = shortLog(beaconBlockRoot) return res.get() debug "Sending sync committee message", message = shortLog(message), validator = shortLog(validator), validator_index = vindex, delay = vc.getDelay(message.slot.sync_committee_message_deadline()) let res = try: await vc.submitPoolSyncCommitteeSignature(message, ApiStrategyKind.First) except ValidatorApiError: error "Unable to publish sync committee message", message = shortLog(message), validator = shortLog(validator), validator_index = vindex return false except CancelledError: debug "Publish sync committee message request was interrupted" return false except CatchableError as exc: error "Unexpected error occurred while publishing sync committee message", message = shortLog(message), validator = shortLog(validator), validator_index = vindex, err_name = exc.name, err_msg = exc.msg return false let delay = vc.getDelay(message.slot.sync_committee_message_deadline()) if res: beacon_sync_committee_messages_sent.inc() beacon_sync_committee_message_sent_delay.observe(delay.toFloatSeconds()) notice "Sync committee message published", message = shortLog(message), validator = shortLog(validator), validator_index = vindex, delay = delay else: warn "Sync committee message was not accepted by beacon node", message = shortLog(message), validator = shortLog(validator), validator_index = vindex, delay = delay return res proc produceAndPublishSyncCommitteeMessages(service: SyncCommitteeServiceRef, slot: Slot, beaconBlockRoot: Eth2Digest, duties: seq[SyncCommitteeDuty]) {.async.} = let vc = service.client let pendingSyncCommitteeMessages = block: var res: seq[Future[bool]] for duty in duties: debug "Serving sync message duty", duty, epoch = slot.epoch() res.add(service.serveSyncCommitteeMessage(slot, beaconBlockRoot, duty)) res let statistics = block: var errored, succeed, failed = 0 try: await allFutures(pendingSyncCommitteeMessages) except CancelledError as exc: for fut in pendingSyncCommitteeMessages: if not(fut.finished()): fut.cancel() await allFutures(pendingSyncCommitteeMessages) raise exc for future in pendingSyncCommitteeMessages: if future.done(): if future.read(): inc(succeed) else: inc(failed) else: inc(errored) (succeed, errored, failed) let delay = vc.getDelay(slot.attestation_deadline()) debug "Sync committee message statistics", total = len(pendingSyncCommitteeMessages), succeed = statistics[0], failed_to_deliver = statistics[1], not_accepted = statistics[2], delay = delay, slot = slot, duties_count = len(duties) proc serveContributionAndProof*(service: SyncCommitteeServiceRef, proof: ContributionAndProof, validator: AttachedValidator): Future[bool] {. async.} = let vc = service.client slot = proof.contribution.slot validatorIdx = validator.index.get() genesisRoot = vc.beaconGenesis.genesis_validators_root fork = vc.forkAtEpoch(slot.epoch) let signature = block: let res = await validator.getContributionAndProofSignature( fork, genesisRoot, proof) if res.isErr(): error "Unable to sign sync committee contribution using remote signer", validator = shortLog(validator), contribution = shortLog(proof.contribution), error_msg = res.error() return false res.get() debug "Sending sync contribution", contribution = shortLog(proof.contribution), validator = shortLog(validator), validator_index = validatorIdx, delay = vc.getDelay(slot.sync_contribution_deadline()) let restSignedProof = RestSignedContributionAndProof.init( proof, signature) let res = try: await vc.publishContributionAndProofs(@[restSignedProof], ApiStrategyKind.First) except ValidatorApiError as err: error "Unable to publish sync contribution", contribution = shortLog(proof.contribution), validator = shortLog(validator), validator_index = validatorIdx, err_msg = err.msg false except CancelledError: debug "Publish sync contribution request was interrupted" return false except CatchableError as err: error "Unexpected error occurred while publishing sync contribution", contribution = shortLog(proof.contribution), validator = shortLog(validator), err_name = err.name, err_msg = err.msg false if res: beacon_sync_committee_contributions_sent.inc() notice "Sync contribution published", validator = shortLog(validator), validator_index = validatorIdx else: warn "Sync contribution was not accepted by beacon node", contribution = shortLog(proof.contribution), validator = shortLog(validator), validator_index = validatorIdx return res proc produceAndPublishContributions(service: SyncCommitteeServiceRef, slot: Slot, beaconBlockRoot: Eth2Digest, duties: seq[SyncCommitteeDuty]) {.async.} = let vc = service.client epoch = slot.epoch fork = vc.forkAtEpoch(epoch) var slotSignatureReqs: seq[Future[SignatureResult]] var validators: seq[(AttachedValidator, SyncSubcommitteeIndex)] for duty in duties: let validator = vc.attachedValidators[].getValidatorForDuties( duty.pubkey, slot).valueOr: continue let subCommitteeIdx = getSubcommitteeIndex(duty.validator_sync_committee_index) future = validator.getSyncCommitteeSelectionProof( fork, vc.beaconGenesis.genesis_validators_root, slot, subCommitteeIdx) slotSignatureReqs.add(future) validators.add((validator, subCommitteeIdx)) try: await allFutures(slotSignatureReqs) except CancelledError as exc: var pendingCancel: seq[Future[void]] for future in slotSignatureReqs: if not(future.finished()): pendingCancel.add(future.cancelAndWait()) await allFutures(pendingCancel) raise exc var contributionsFuts: array[SYNC_COMMITTEE_SUBNET_COUNT, Future[SyncCommitteeContribution]] let validatorContributions = block: var res: seq[ContributionItem] for idx, fut in slotSignatureReqs: if fut.done: let sigRes = fut.read validator = validators[idx][0] subCommitteeIdx = validators[idx][1] if sigRes.isErr: error "Unable to create slot signature using remote signer", validator = shortLog(validator), error_msg = sigRes.error() elif validator.index.isSome and is_sync_committee_aggregator(sigRes.get): res.add ContributionItem( aggregator_index: uint64(validator.index.get), selection_proof: sigRes.get, validator: validator, subcommitteeIdx: subCommitteeIdx) if isNil(contributionsFuts[subCommitteeIdx]): contributionsFuts[int subCommitteeIdx] = vc.produceSyncCommitteeContribution( slot, subCommitteeIdx, beaconBlockRoot, ApiStrategyKind.Best) res if len(validatorContributions) > 0: let pendingAggregates = block: var res: seq[Future[bool]] for item in validatorContributions: let aggContribution = try: await contributionsFuts[item.subcommitteeIdx] except ValidatorApiError: error "Unable to get sync message contribution data", slot = slot, beaconBlockRoot = shortLog(beaconBlockRoot) return except CancelledError: debug "Request for sync message contribution was interrupted" return except CatchableError as exc: error "Unexpected error occurred while getting sync message "& "contribution", slot = slot, beaconBlockRoot = shortLog(beaconBlockRoot), err_name = exc.name, err_msg = exc.msg return let proof = ContributionAndProof( aggregator_index: item.aggregator_index, contribution: aggContribution, selection_proof: item.selection_proof ) res.add(service.serveContributionAndProof(proof, item.validator)) res let statistics = block: var errored, succeed, failed = 0 try: await allFutures(pendingAggregates) except CancelledError as err: for fut in pendingAggregates: if not(fut.finished()): fut.cancel() await allFutures(pendingAggregates) raise err 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(slot.aggregate_deadline()) debug "Sync message contribution statistics", total = len(pendingAggregates), succeed = statistics[0], failed_to_deliver = statistics[1], not_accepted = statistics[2], delay = delay, slot = slot else: debug "No contribution and proofs scheduled for slot", slot = slot proc publishSyncMessagesAndContributions(service: SyncCommitteeServiceRef, slot: Slot, duties: seq[SyncCommitteeDuty]) {. async.} = let vc = service.client await vc.waitForBlockPublished(slot, syncCommitteeMessageSlotOffset) block: let delay = vc.getDelay(slot.sync_committee_message_deadline()) debug "Producing sync committee messages", delay = delay, slot = slot, duties_count = len(duties) let beaconBlockRoot = block: try: let res = await vc.getHeadBlockRoot(ApiStrategyKind.First) if res.execution_optimistic.isNone(): ## The `execution_optimistic` is missing from the response, we assume ## that the BN is unaware optimistic sync, so we consider the BN ## to be synchronized with the network. ## TODO (cheatfate): This should be removed when VC will be able to ## handle getSpec() API call with fork constants. res.data.root else: if res.execution_optimistic.get(): error "Could not obtain head block's root because beacon node " & "only optimistically synced", slot = slot return res.data.root except ValidatorApiError as exc: error "Unable to retrieve head block's root to sign", reason = exc.msg return except CancelledError: debug "Block root request was interrupted" return except CatchableError as exc: error "Unexpected error while requesting sync message block root", err_name = exc.name, err_msg = exc.msg, slot = slot return try: await service.produceAndPublishSyncCommitteeMessages(slot, beaconBlockRoot, duties) except ValidatorApiError: error "Unable to proceed sync committee messages", slot = slot, duties_count = len(duties) return except CancelledError: debug "Sync committee producing process was interrupted" return except CatchableError as exc: error "Unexpected error while producing sync committee messages", slot = slot, duties_count = len(duties), err_name = exc.name, err_msg = exc.msg return let contributionTime = # chronos.Duration subtraction cannot return a negative value; in such # case it will return `ZeroDuration`. vc.beaconClock.durationToNextSlot() - OneThirdDuration if contributionTime != ZeroDuration: await sleepAsync(contributionTime) block: let delay = vc.getDelay(slot.sync_contribution_deadline()) debug "Producing contribution and proofs", delay = delay await service.produceAndPublishContributions(slot, beaconBlockRoot, duties) proc spawnSyncCommitteeTasks(service: SyncCommitteeServiceRef, slot: Slot) = let vc = service.client duties = vc.getSyncCommitteeDutiesForSlot(slot + 1) asyncSpawn service.publishSyncMessagesAndContributions(slot, duties) proc mainLoop(service: SyncCommitteeServiceRef) {.async.} = let vc = service.client service.state = ServiceState.Running debug "Service started" debug "Sync committee duties loop waiting for fork schedule update" await vc.forksAvailable.wait() 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: let sleepTime = syncCommitteeMessageSlotOffset + vc.beaconClock.durationToNextSlot() let sres = vc.getCurrentSlot() if sres.isSome(): let currentSlot = sres.get() service.spawnSyncCommitteeTasks(currentSlot) await sleepAsync(sleepTime) false except CancelledError: debug "Service interrupted" 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[SyncCommitteeServiceRef], vc: ValidatorClientRef): Future[SyncCommitteeServiceRef] {.async.} = logScope: service = ServiceName let res = SyncCommitteeServiceRef(name: ServiceName, client: vc, state: ServiceState.Initialized) debug "Initializing service" return res proc start*(service: SyncCommitteeServiceRef) = service.lifeFut = mainLoop(service)