import std_shims/[os_shims, objects], net, sequtils, options, tables, chronos, chronicles, confutils, eth/[p2p, keys], spec/[datatypes, digest, crypto, beaconstate, helpers, validator], conf, time, state_transition, fork_choice, ssz, beacon_chain_db, validator_pool, extras, mainchain_monitor, sync_protocol, gossipsub_protocol, trusted_state_snapshots, eth/trie/db, eth/trie/backends/rocksdb_backend type BeaconNode* = ref object beaconState*: BeaconState network*: EthereumNode db*: BeaconChainDB config*: BeaconNodeConf keys*: KeyPair attachedValidators: ValidatorPool attestationPool: AttestationPool mainchainMonitor: MainchainMonitor lastScheduledEpoch: uint64 headBlock: BeaconBlock headBlockRoot: Eth2Digest blocksChildren: Table[Eth2Digest, seq[Eth2Digest]] const version = "v0.1" # TODO: read this from the nimble file clientId = "nimbus beacon node " & version topicBeaconBlocks = "ethereum/2.1/beacon_chain/blocks" topicAttestations = "ethereum/2.1/beacon_chain/attestations" stateStoragePeriod = EPOCH_LENGTH * 10 # Save states once per this number of slots. TODO: Find a good number. func shortHash(x: auto): string = ($x)[0..7] func shortValidatorKey(node: BeaconNode, validatorIdx: int): string = ($node.beaconState.validator_registry[validatorIdx].pubkey)[0..7] proc ensureNetworkKeys*(dataDir: string): KeyPair = # TODO: # 1. Check if keys already exist in the data dir # 2. Generate new ones and save them in the directory # if necessary return newKeyPair() proc init*(T: type BeaconNode, conf: BeaconNodeConf): T = new result result.config = conf result.attachedValidators = ValidatorPool.init init result.attestationPool, 0 init result.mainchainMonitor, "", Port(0) # TODO: specify geth address and port let trieDB = trieDB newChainDb(string conf.dataDir) result.db = BeaconChainDB.init(trieDB) if not result.db.isInitialized: # Use stateSnapshot as genesis info "Initializing DB" result.db.persistState(result.config.stateSnapshot.get) result.keys = ensureNetworkKeys(string conf.dataDir) var address: Address address.ip = parseIpAddress("127.0.0.1") address.tcpPort = Port(conf.tcpPort) address.udpPort = Port(conf.udpPort) result.network = newEthereumNode(result.keys, address, 0, nil, clientId, minPeers = 1) writeFile(string(conf.dataDir) / "beacon_node.address", $result.network.listeningAddress) proc connectToNetwork(node: BeaconNode) {.async.} = var bootstrapNodes = newSeq[ENode]() for node in node.config.bootstrapNodes: bootstrapNodes.add initENode(node) let bootstrapFile = string node.config.bootstrapNodesFile if bootstrapFile.len > 0: for ln in lines(bootstrapFile): bootstrapNodes.add initENode(string ln) if bootstrapNodes.len > 0: info "Connecting to bootstrap nodes", bootstrapNodes await node.network.connectToNetwork(bootstrapNodes) else: info "Waiting for connections" node.network.startListening() proc sync*(node: BeaconNode): Future[bool] {.async.} = let persistedState = node.db.lastFinalizedState() if persistedState.slotDistanceFromNow() > WEAK_SUBJECTVITY_PERIOD.int64: node.beaconState = await obtainTrustedStateSnapshot(node.db) else: node.beaconState = persistedState var targetSlot = node.beaconState.getSlotFromTime() let t = now() if t < node.beaconState.genesisTime * 1000: await sleepAsync int(node.beaconState.genesisTime * 1000 - t) while node.beaconState.finalized_epoch < targetSlot.slot_to_epoch: var (peer, changeLog) = await node.network.getValidatorChangeLog( node.beaconState.validator_registry_delta_chain_tip) if peer == nil: error "Failed to sync with any peer" return false if applyValidatorChangeLog(changeLog, node.beaconState): node.db.persistState(node.beaconState) node.db.persistBlock(changeLog.signedBlock) else: warn "Ignoring invalid validator change log", sentFrom = peer return true template findIt(s: openarray, predicate: untyped): int = var res = -1 for i, it {.inject.} in s: if predicate: res = i break res proc addLocalValidators*(node: BeaconNode) = for validator in node.config.validators: let privKey = validator.privKey pubKey = privKey.pubKey() randao = validator.randao let idx = node.beaconState.validator_registry.findIt(it.pubKey == pubKey) if idx == -1: warn "Validator not in registry", pubKey else: debug "Attaching validator", validator = shortValidatorKey(node, idx), idx, pubKey node.attachedValidators.addLocalValidator(idx, pubKey, privKey, randao) info "Local validators attached ", count = node.attachedValidators.count proc getAttachedValidator(node: BeaconNode, idx: int): AttachedValidator = let validatorKey = node.beaconState.validator_registry[idx].pubkey return node.attachedValidators.getValidator(validatorKey) proc makeAttestation(node: BeaconNode, validator: AttachedValidator, slot: uint64, shard: uint64, committeeLen: int, indexInCommittee: int) {.async.} = doAssert node != nil doAssert validator != nil if get_current_epoch(node.beaconState) == node.beaconState.justified_epoch: return let justifiedBlockRoot = get_block_root(node.beaconState, get_epoch_start_slot(node.beaconState.justified_epoch)) var attestationData = AttestationData( slot: slot, shard: shard, beacon_block_root: node.headBlockRoot, epoch_boundary_root: Eth2Digest(), # TODO shard_block_root: Eth2Digest(), # TODO latest_crosslink_root: Eth2Digest(), # TODO justified_epoch: node.beaconState.justified_epoch, justified_block_root: justifiedBlockRoot) let validatorSignature = await validator.signAttestation(attestationData) var participationBitfield = repeat(0'u8, ceil_div8(committeeLen)) bitSet(participationBitfield, indexInCommittee) var attestation = Attestation( data: attestationData, aggregate_signature: validatorSignature, aggregation_bitfield: participationBitfield) await node.network.broadcast(topicAttestations, attestation) info "Attestation sent", slot = slot, shard = shard, validator = shortValidatorKey(node, validator.idx), signature = shortHash(validatorSignature) proc proposeBlock(node: BeaconNode, validator: AttachedValidator, slot: uint64) {.async.} = doAssert node != nil doAssert validator != nil doAssert validator.idx < node.beaconState.validator_registry.len var state = node.beaconState if node.beaconState.slot + 1 < slot: info "Proposing block after slot gap", slot, stateSlot = node.beaconState.slot for s in node.beaconState.slot + 1 ..< slot: let ok = updateState(state, node.headBlockRoot, none[BeaconBlock](), {}) doAssert ok var blockBody = BeaconBlockBody( attestations: node.attestationPool.getAttestationsForBlock(node.beaconState, slot)) var newBlock = BeaconBlock( slot: slot, parent_root: node.headBlockRoot, randao_reveal: ValidatorSig(), # TODO probably wrong eth1_data: node.mainchainMonitor.getBeaconBlockRef(), signature: ValidatorSig(), # we need the rest of the block first! body: blockBody) let ok = updateState(state, node.headBlockRoot, some(newBlock), {skipValidation}) doAssert ok # TODO: err, could this fail somehow? newBlock.state_root = Eth2Digest(data: hash_tree_root(state)) var signedData = ProposalSignedData( slot: slot, shard: BEACON_CHAIN_SHARD_NUMBER, blockRoot: hash_tree_root_final(newBlock)) newBlock.signature = await validator.signBlockProposal(signedData) await node.network.broadcast(topicBeaconBlocks, newBlock) info "Block proposed", slot = slot, stateRoot = shortHash(newBlock.state_root), validator = shortValidatorKey(node, validator.idx) proc scheduleBlockProposal(node: BeaconNode, slot: uint64, validator: AttachedValidator) = # TODO: # This function exists only to hide a bug with Nim's closures. # If you inline it in `scheduleEpochActions`, you'll see the # internal `doAssert` starting to fail. doAssert validator != nil let at = node.beaconState.slotStart(slot) info "Scheduling block proposal", validator = shortValidatorKey(node, validator.idx), slot, fromNow = (at - fastEpochTime()) div 1000 addTimer(node.beaconState.slotStart(slot)) do (x: pointer) {.gcsafe.}: # TODO timers are generally not accurate / guaranteed to fire at the right # time - need to guard here against early / late firings doAssert validator != nil asyncCheck proposeBlock(node, validator, slot.uint64) proc scheduleAttestation(node: BeaconNode, validator: AttachedValidator, slot: uint64, shard: uint64, committeeLen: int, indexInCommittee: int) = # TODO: # This function exists only to hide a bug with Nim's closures. # If you inline it in `scheduleEpochActions`, you'll see the # internal `doAssert` starting to fail. doAssert validator != nil addTimer(node.beaconState.slotMiddle(slot)) do (p: pointer) {.gcsafe.}: doAssert validator != nil asyncCheck makeAttestation(node, validator, slot.uint64, shard, committeeLen, indexInCommittee) proc scheduleEpochActions(node: BeaconNode, epoch: uint64) = ## This schedules the required block proposals and ## attestations from our attached validators. doAssert node != nil debug "Scheduling epoch actions", epoch # TODO: this copy of the state shouldn't be necessary, but please # see the comments in `get_beacon_proposer_index` var nextState = node.beaconState for i in 0.uint64 ..< EPOCH_LENGTH: # Schedule block proposals let slot = epoch * EPOCH_LENGTH + i + 1 nextState.slot = slot let proposerIdx = get_beacon_proposer_index(nextState, slot) let validator = node.getAttachedValidator(proposerIdx) if validator != nil: # TODO: # Warm-up the proposer earlier to try to obtain previous # missing blocks if necessary scheduleBlockProposal(node, slot, validator) # Schedule attestations for crosslink_committee in get_crosslink_committees_at_slot( node.beaconState, slot): #for i, validatorIdx in shard.committee: for i, validatorIdx in crosslink_committee.committee: let validator = node.getAttachedValidator(validatorIdx) if validator != nil: #scheduleAttestation(node, validator, slot, shard.shard, shard.committee.len, i) scheduleAttestation( node, validator, slot, crosslink_committee.shard, crosslink_committee.committee.len, i) node.lastScheduledEpoch = epoch let nextEpoch = epoch + 1 at = node.beaconState.slotMiddle(nextEpoch * EPOCH_LENGTH) info "Scheduling next epoch update", fromNow = (at - fastEpochTime()) div 1000, nextEpoch addTimer(at) do (p: pointer): if node.lastScheduledEpoch != nextEpoch: node.scheduleEpochActions(nextEpoch) proc stateNeedsSaving(s: BeaconState): bool = # TODO: Come up with a better predicate logic s.slot mod stateStoragePeriod == 0 proc processBlocks*(node: BeaconNode) = node.network.subscribe(topicBeaconBlocks) do (newBlock: BeaconBlock): let stateSlot = node.beaconState.slot info "Block received", slot = newBlock.slot, stateRoot = shortHash(newBlock.state_root), stateSlot # TODO: This should be replaced with the real fork-choice rule if newBlock.slot <= stateSlot: debug "Ignoring block" return let newBlockRoot = hash_tree_root_final(newBlock) var state = node.beaconState if stateSlot + 1 < newBlock.slot: info "Advancing state past slot gap", blockSlot = newBlock.slot, stateSlot for slot in stateSlot + 1 ..< newBlock.slot: let ok = updateState(state, node.headBlockRoot, none[BeaconBlock](), {}) doAssert ok let ok = updateState(state, node.headBlockRoot, some(newBlock), {}) if not ok: debug "Ignoring non-validating block" return node.headBlock = newBlock node.headBlockRoot = newBlockRoot node.beaconState = state if stateNeedsSaving(node.beaconState): node.db.persistState(node.beaconState) node.db.persistBlock(newBlock) # TODO: # # 1. Check for missing blocks and obtain them # # 2. Apply fork-choice rule (update node.headBlock) # # 3. Peform block processing / state recalculation / etc # let epoch = newBlock.slot.epoch if epoch != node.lastScheduledEpoch: node.scheduleEpochActions(epoch) node.network.subscribe(topicAttestations) do (a: Attestation): let participants = get_attestation_participants( node.beaconState, a.data, a.aggregation_bitfield). mapIt(shortValidatorKey(node, it)) info "Attestation received", slot = a.data.slot, shard = a.data.shard, signature = shortHash(a.aggregate_signature), participants node.attestationPool.add(a, node.beaconState) let epoch = node.beaconState.getSlotFromTime div EPOCH_LENGTH node.scheduleEpochActions(epoch) runForever() var gPidFile: string proc createPidFile(filename: string) = createDir splitFile(filename).dir writeFile filename, $getCurrentProcessId() gPidFile = filename addQuitProc proc {.noconv.} = removeFile gPidFile when isMainModule: let config = load BeaconNodeConf if config.logLevel != LogLevel.NONE: setLogLevel(config.logLevel) case config.cmd of createChain: createStateSnapshot(config.chainStartupData, config.outputStateFile.string) quit 0 of noCommand: waitFor synchronizeClock() createPidFile(config.dataDir.string / "beacon_node.pid") var node = BeaconNode.init config dynamicLogScope(node = node.config.tcpPort - 50000): waitFor node.connectToNetwork() if not waitFor node.sync(): quit 1 info "Starting beacon node", slotsSinceFinalization = node.beaconState.slotDistanceFromNow(), stateSlot = node.beaconState.slot node.addLocalValidators() node.processBlocks()