1096 lines
41 KiB
Nim
1096 lines
41 KiB
Nim
import
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# Standard library
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net, sequtils, tables, osproc, random, strutils, times, strformat,
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# Nimble packages
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stew/shims/os, stew/[objects, bitseqs],
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chronos, chronicles, confutils, metrics,
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json_serialization/std/[options, sets], serialization/errors,
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eth/trie/db, eth/trie/backends/rocksdb_backend, eth/async_utils,
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# Local modules
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spec/[datatypes, digest, crypto, beaconstate, helpers, validator, network],
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conf, time, state_transition, fork_choice, ssz, beacon_chain_db,
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validator_pool, extras, attestation_pool, block_pool, eth2_network,
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beacon_node_types, mainchain_monitor, version,
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sync_protocol, request_manager, validator_keygen, interop, statusbar
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const
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dataDirValidators = "validators"
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networkMetadataFile = "network.json"
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genesisFile = "genesis.json"
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testnetsBaseUrl = "https://serenity-testnets.status.im"
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hasPrompt = not defined(withoutPrompt)
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# https://github.com/ethereum/eth2.0-metrics/blob/master/metrics.md#interop-metrics
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declareGauge beacon_slot, "Latest slot of the beacon chain state"
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declareGauge beacon_head_slot, "Slot of the head block of the beacon chain"
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declareGauge beacon_head_root, "Root of the head block of the beacon chain"
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# https://github.com/ethereum/eth2.0-metrics/blob/master/metrics.md#additional-metrics
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declareGauge beacon_pending_exits, "Number of pending voluntary exits in local operation pool" # On slot
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# Metrics for tracking attestation and beacon block loss
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declareCounter beacon_attestations_sent, "Number of beacon chain attestations sent by this peer"
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declareCounter beacon_attestations_received, "Number of beacon chain attestations received by this peer"
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declareCounter beacon_blocks_proposed, "Number of beacon chain blocks sent by this peer"
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declareCounter beacon_blocks_received, "Number of becon chain blocks received by this peer"
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logScope: topics = "beacnde"
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proc onBeaconBlock*(node: BeaconNode, blck: BeaconBlock) {.gcsafe.}
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func localValidatorsDir(conf: BeaconNodeConf): string =
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conf.dataDir / "validators"
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func databaseDir(conf: BeaconNodeConf): string =
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conf.dataDir / "db"
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template `//`(url, fragment: string): string =
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url & "/" & fragment
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proc downloadFile(url: string): Future[string] {.async.} =
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# TODO We need a proper HTTP client able to perform HTTPS downloads
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let tempFile = getTempDir() / "nimbus.download"
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let cmd = "curl --fail -o " & quoteShell(tempFile) & " " & url
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let (fileContents, errorCode) = execCmdEx(cmd, options = {poUsePath})
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if errorCode != 0:
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raise newException(IOError, "Failed external command: '" & cmd & "', exit code: " & $errorCode & ", output: '" & fileContents & "'")
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return readFile(tempFile)
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proc updateTestnetMetadata(conf: BeaconNodeConf): Future[NetworkMetadata] {.async.} =
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let metadataUrl = testnetsBaseUrl // $conf.network // networkMetadataFile
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let latestMetadata = await downloadFile(metadataUrl)
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try:
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result = Json.decode(latestMetadata, NetworkMetadata)
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except SerializationError as err:
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stderr.write "Error while loading the testnet metadata. Your client my be out of date.\n"
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stderr.write err.formatMsg(metadataUrl), "\n"
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stderr.write "Please follow the instructions at https://github.com/status-im/nim-beacon-chain " &
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"in order to produce an up-to-date build.\n"
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quit 1
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let localMetadataFile = conf.dataDir / networkMetadataFile
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if fileExists(localMetadataFile) and readFile(localMetadataFile).string == latestMetadata:
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return
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info "New testnet genesis data received. Starting with a fresh database."
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createDir conf.dataDir.string
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removeDir conf.databaseDir
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writeFile localMetadataFile, latestMetadata
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let newGenesis = await downloadFile(testnetsBaseUrl // $conf.network // genesisFile)
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writeFile conf.dataDir / genesisFile, newGenesis
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proc obtainTestnetKey(conf: BeaconNodeConf): Future[(string, string)] {.async.} =
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let
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metadata = await updateTestnetMetadata(conf)
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privKeyName = validatorFileBaseName(rand(metadata.userValidatorsRange)) & ".privkey"
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privKeyUrl = testnetsBaseUrl // $conf.network // privKeyName
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privKeyContent = strip await downloadFile(privKeyUrl)
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let key = ValidatorPrivKey.init(privKeyContent)
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return (privKeyName, privKeyContent)
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proc saveValidatorKey(keyName, key: string, conf: BeaconNodeConf) =
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let validatorsDir = conf.dataDir / dataDirValidators
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let outputFile = validatorsDir / keyName
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createDir validatorsDir
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writeFile(outputFile, key)
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info "Imported validator key", file = outputFile
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proc initGenesis(node: BeaconNode) {.async.} =
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template conf: untyped = node.config
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var tailState: BeaconState
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if conf.depositWeb3Url.len != 0:
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info "Waiting for genesis state from eth1"
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tailState = await node.mainchainMonitor.getGenesis()
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else:
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var snapshotFile = conf.dataDir / genesisFile
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try:
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if conf.stateSnapshot.isSome:
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snapshotFile = conf.stateSnapshot.get.string
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if not fileExists(snapshotFile):
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error "Nimbus database not initialized. Please specify the initial state snapshot file."
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quit 1
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template loadSnapshot(Format) =
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info "Importing snapshot file", path = snapshotFile
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tailState = loadFile(Format, snapshotFile, BeaconState)
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let ext = splitFile(snapshotFile).ext
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if cmpIgnoreCase(ext, ".ssz") == 0:
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loadSnapshot SSZ
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elif cmpIgnoreCase(ext, ".json") == 0:
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loadSnapshot Json
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else:
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error "The --stateSnapshot option expects a json or a ssz file."
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quit 1
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except SerializationError as err:
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stderr.write "Failed to import ", snapshotFile, "\n"
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stderr.write err.formatMsg(snapshotFile), "\n"
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quit 1
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info "Got genesis state", hash = hash_tree_root(tailState)
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node.forkVersion = tailState.fork.current_version
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try:
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let tailBlock = get_initial_beacon_block(tailState)
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BlockPool.preInit(node.db, tailState, tailBlock)
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except:
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stderr.write "Failed to initialize database\n"
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stderr.write getCurrentExceptionMsg(), "\n"
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quit 1
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proc init*(T: type BeaconNode, conf: BeaconNodeConf): Future[BeaconNode] {.async.} =
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new result
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result.onBeaconBlock = onBeaconBlock
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result.config = conf
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result.networkIdentity = getPersistentNetIdentity(conf)
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result.nickname = if conf.nodename == "auto": shortForm(result.networkIdentity)
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else: conf.nodename
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template fail(args: varargs[untyped]) =
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stderr.write args, "\n"
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quit 1
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if not conf.quickStart:
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case conf.network
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of "mainnet":
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fail "The Serenity mainnet hasn't been launched yet"
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of "testnet0", "testnet1":
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result.networkMetadata = await updateTestnetMetadata(conf)
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else:
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try:
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result.networkMetadata = Json.loadFile(conf.network, NetworkMetadata)
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except SerializationError as err:
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fail "Failed to load network metadata: \n", err.formatMsg(conf.network)
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var metadataErrorMsg = ""
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template checkCompatibility(metadataField, LOCAL_CONSTANT) =
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let metadataValue = metadataField
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if metadataValue != LOCAL_CONSTANT:
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if metadataErrorMsg.len > 0: metadataErrorMsg.add " and"
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metadataErrorMsg.add " -d:" & astToStr(LOCAL_CONSTANT) & "=" & $metadataValue &
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" (instead of " & $LOCAL_CONSTANT & ")"
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if result.networkMetadata.networkGeneration != semanticVersion:
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let newerVersionRequired = result.networkMetadata.networkGeneration.int > semanticVersion
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let newerOrOlder = if newerVersionRequired: "a newer" else: "an older"
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stderr.write &"Connecting to '{conf.network}' requires {newerOrOlder} version of Nimbus. "
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if newerVersionRequired:
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stderr.write "Please follow the instructions at https://github.com/status-im/nim-beacon-chain " &
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"in order to produce an up-to-date build.\n"
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quit 1
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checkCompatibility result.networkMetadata.numShards , SHARD_COUNT
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checkCompatibility result.networkMetadata.slotDuration , SECONDS_PER_SLOT
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checkCompatibility result.networkMetadata.slotsPerEpoch , SLOTS_PER_EPOCH
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if metadataErrorMsg.len > 0:
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fail "To connect to the ", conf.network, " network, please compile with", metadataErrorMsg
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for bootNode in result.networkMetadata.bootstrapNodes:
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if bootNode.isSameNode(result.networkIdentity):
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result.isBootstrapNode = true
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else:
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result.bootstrapNodes.add bootNode
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for bootNode in conf.bootstrapNodes:
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result.bootstrapNodes.add BootstrapAddr.init(bootNode)
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let bootstrapFile = string conf.bootstrapNodesFile
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if bootstrapFile.len > 0:
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for ln in lines(bootstrapFile):
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result.bootstrapNodes.add BootstrapAddr.init(string ln)
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result.attachedValidators = ValidatorPool.init
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if conf.depositWeb3Url.len != 0:
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result.mainchainMonitor = MainchainMonitor.init(conf.depositWeb3Url, conf.depositContractAddress)
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result.mainchainMonitor.start()
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let trieDB = trieDB newChainDb(string conf.databaseDir)
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result.db = BeaconChainDB.init(trieDB)
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# TODO this is problably not the right place to ensure that db is sane..
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# TODO does it really make sense to load from DB if a state snapshot has been
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# specified on command line? potentially, this should be the other way
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# around...
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if result.db.getHeadBlock().isNone():
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await result.initGenesis()
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result.blockPool = BlockPool.init(result.db)
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result.attestationPool = AttestationPool.init(result.blockPool)
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result.network = await createEth2Node(conf, result.bootstrapNodes)
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result.requestManager.init result.network
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# TODO sync is called when a remote peer is connected - is that the right
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# time to do so?
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let sync = result.network.protocolState(BeaconSync)
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sync.node = result
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sync.db = result.db
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result.stateCache = result.blockPool.loadTailState()
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result.justifiedStateCache = result.stateCache
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let addressFile = string(conf.dataDir) / "beacon_node.address"
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result.network.saveConnectionAddressFile(addressFile)
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result.beaconClock = BeaconClock.init(result.stateCache.data.data)
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when useInsecureFeatures:
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if conf.metricsServer:
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let metricsAddress = conf.metricsServerAddress
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info "Starting metrics HTTP server", address = metricsAddress, port = conf.metricsServerPort
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metrics.startHttpServer(metricsAddress, Port(conf.metricsServerPort))
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template withState(
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pool: BlockPool, cache: var StateData, blockSlot: BlockSlot, body: untyped): untyped =
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## Helper template that updates state to a particular BlockSlot - usage of
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## cache is unsafe outside of block.
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## TODO async transformations will lead to a race where cache gets updated
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## while waiting for future to complete - catch this here somehow?
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updateStateData(pool, cache, blockSlot)
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template hashedState(): HashedBeaconState {.inject.} = cache.data
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template state(): BeaconState {.inject.} = cache.data.data
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template blck(): BlockRef {.inject.} = cache.blck
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template root(): Eth2Digest {.inject.} = cache.data.root
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body
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proc connectToNetwork(node: BeaconNode) {.async.} =
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if node.bootstrapNodes.len > 0:
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info "Connecting to bootstrap nodes", bootstrapNodes = node.bootstrapNodes
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else:
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info "Waiting for connections"
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await node.network.connectToNetwork(node.bootstrapNodes)
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template findIt(s: openarray, predicate: untyped): int =
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var res = -1
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for i, it {.inject.} in s:
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if predicate:
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res = i
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break
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res
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proc addLocalValidator(
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node: BeaconNode, state: BeaconState, privKey: ValidatorPrivKey) =
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let pubKey = privKey.pubKey()
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let idx = state.validators.findIt(it.pubKey == pubKey)
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if idx == -1:
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warn "Validator not in registry", pubKey
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else:
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node.attachedValidators.addLocalValidator(ValidatorIndex(idx), pubKey, privKey)
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proc addLocalValidators(node: BeaconNode, state: BeaconState) =
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for validatorKeyFile in node.config.validators:
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node.addLocalValidator state, validatorKeyFile.load
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for kind, file in walkDir(node.config.localValidatorsDir):
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if kind in {pcFile, pcLinkToFile}:
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node.addLocalValidator state, ValidatorPrivKey.init(readFile(file).string)
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info "Local validators attached ", count = node.attachedValidators.count
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proc getAttachedValidator(
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node: BeaconNode, state: BeaconState, idx: ValidatorIndex): AttachedValidator =
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let validatorKey = state.validators[idx].pubkey
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node.attachedValidators.getValidator(validatorKey)
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proc updateHead(node: BeaconNode, slot: Slot): BlockRef =
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# Use head state for attestation resolution below
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# Check pending attestations - maybe we found some blocks for them
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node.attestationPool.resolve(node.stateCache)
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# TODO move all of this logic to BlockPool
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let
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justifiedHead = node.blockPool.latestJustifiedBlock()
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let newHead = node.blockPool.withState(
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node.justifiedStateCache, justifiedHead):
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lmdGhost(node.attestationPool, state, justifiedHead.blck)
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node.blockPool.updateHead(node.stateCache, newHead)
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beacon_head_slot.set slot.int64
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beacon_head_root.set newHead.root.toGaugeValue
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newHead
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proc sendAttestation(node: BeaconNode,
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state: BeaconState,
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validator: AttachedValidator,
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attestationData: AttestationData,
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committeeLen: int,
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indexInCommittee: int) {.async.} =
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logScope: pcs = "send_attestation"
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let
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validatorSignature = await validator.signAttestation(attestationData, state)
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var aggregationBits = CommitteeValidatorsBits.init(committeeLen)
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aggregationBits.raiseBit indexInCommittee
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var attestation = Attestation(
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data: attestationData,
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signature: validatorSignature,
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aggregation_bits: aggregationBits,
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# Stub in phase0
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custody_bits: CommitteeValidatorsBits.init(committeeLen)
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)
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node.network.broadcast(topicAttestations, attestation)
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info "Attestation sent",
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attestationData = shortLog(attestationData),
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validator = shortLog(validator),
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signature = shortLog(validatorSignature),
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indexInCommittee = indexInCommittee,
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cat = "consensus"
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beacon_attestations_sent.inc()
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proc proposeBlock(node: BeaconNode,
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validator: AttachedValidator,
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head: BlockRef,
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slot: Slot): Future[BlockRef] {.async.} =
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logScope: pcs = "block_proposal"
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if head.slot > slot:
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notice "Skipping proposal, we've already selected a newer head",
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headSlot = shortLog(head.slot),
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headBlockRoot = shortLog(head.root),
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slot = shortLog(slot),
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cat = "fastforward"
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return head
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if head.slot == slot:
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# Weird, we should never see as head the same slot as we're proposing a
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# block for - did someone else steal our slot? why didn't we discard it?
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warn "Found head at same slot as we're supposed to propose for!",
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headSlot = shortLog(head.slot),
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headBlockRoot = shortLog(head.root),
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cat = "consensus_conflict"
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# TODO investigate how and when this happens.. maybe it shouldn't be an
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# assert?
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doAssert false, "head slot matches proposal slot (!)"
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# return
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# Get eth1data which may be async
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# TODO it's a bad idea to get eth1data async because that might delay block
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# production
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let (eth1data, deposits) = node.blockPool.withState(
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node.stateCache, BlockSlot(blck: head, slot: slot - 1)):
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if node.mainchainMonitor.isNil:
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let e1d =
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get_eth1data_stub(
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state.eth1_deposit_index, slot.compute_epoch_of_slot())
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(e1d, newSeq[Deposit]())
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else:
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let e1d = await node.mainchainMonitor.getBeaconBlockRef()
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(e1d, node.mainchainMonitor.getPendingDeposits())
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let (nroot, nblck) = node.blockPool.withState(
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node.stateCache, BlockSlot(blck: head, slot: slot - 1)):
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# To create a block, we'll first apply a partial block to the state, skipping
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# some validations.
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let
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blockBody = BeaconBlockBody(
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randao_reveal: validator.genRandaoReveal(state, slot),
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eth1_data: eth1data,
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attestations:
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node.attestationPool.getAttestationsForBlock(state, slot),
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deposits: deposits)
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var
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newBlock = BeaconBlock(
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slot: slot,
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parent_root: head.root,
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body: blockBody,
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# TODO: This shouldn't be necessary if OpaqueBlob is the default
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signature: ValidatorSig(kind: OpaqueBlob))
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var
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tmpState = hashedState
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cache = get_empty_per_epoch_cache()
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let ok = state_transition(tmpState, newBlock, {skipValidation})
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# TODO only enable in fast-fail debugging situations
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# otherwise, bad attestations can bring down network
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# doAssert ok # TODO: err, could this fail somehow?
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newBlock.state_root = tmpState.root
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let blockRoot = signing_root(newBlock)
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# Careful, state no longer valid after here..
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newBlock.signature =
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await validator.signBlockProposal(state, slot, blockRoot)
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(blockRoot, newBlock)
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let newBlockRef = node.blockPool.add(node.stateCache, nroot, nblck)
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if newBlockRef == nil:
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warn "Unable to add proposed block to block pool",
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newBlock = shortLog(newBlock),
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blockRoot = shortLog(blockRoot),
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cat = "bug"
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return head
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info "Block proposed",
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blck = shortLog(newBlock),
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blockRoot = shortLog(newBlockRef.root),
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validator = shortLog(validator),
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cat = "consensus"
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node.network.broadcast(topicBeaconBlocks, newBlock)
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beacon_blocks_proposed.inc()
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return newBlockRef
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proc onAttestation(node: BeaconNode, attestation: Attestation) =
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# We received an attestation from the network but don't know much about it
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# yet - in particular, we haven't verified that it belongs to particular chain
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# we're on, or that it follows the rules of the protocol
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logScope: pcs = "on_attestation"
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debug "Attestation received",
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attestationData = shortLog(attestation.data),
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signature = shortLog(attestation.signature),
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cat = "consensus" # Tag "consensus|attestation"?
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# This is the shared codepath for both topic attestation and beacon block
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# attestations.
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beacon_attestations_received.inc()
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if (let attestedBlock = node.blockPool.getOrResolve(
|
|
attestation.data.beacon_block_root); attestedBlock != nil):
|
|
let
|
|
wallSlot = node.beaconClock.now().toSlot()
|
|
head = node.blockPool.head
|
|
|
|
if not wallSlot.afterGenesis or wallSlot.slot < head.blck.slot:
|
|
warn "Received attestation before genesis or head - clock is wrong?",
|
|
afterGenesis = wallSlot.afterGenesis,
|
|
wallSlot = shortLog(wallSlot.slot),
|
|
headSlot = shortLog(head.blck.slot),
|
|
cat = "clock_drift" # Tag "attestation|clock_drift"?
|
|
return
|
|
|
|
# TODO seems reasonable to use the latest head state here.. needs thinking
|
|
# though - maybe we should use the state from the block pointed to by
|
|
# the attestation for some of the check? Consider interop with block
|
|
# production!
|
|
let
|
|
bs = BlockSlot(blck: head.blck, slot: wallSlot.slot)
|
|
|
|
node.blockPool.withState(node.stateCache, bs):
|
|
node.attestationPool.add(state, attestedBlock, attestation)
|
|
else:
|
|
node.attestationPool.addUnresolved(attestation)
|
|
|
|
proc onBeaconBlock(node: BeaconNode, blck: BeaconBlock) =
|
|
# We received a block but don't know much about it yet - in particular, we
|
|
# don't know if it's part of the chain we're currently building.
|
|
let blockRoot = signing_root(blck)
|
|
debug "Block received",
|
|
blck = shortLog(blck),
|
|
blockRoot = shortLog(blockRoot),
|
|
cat = "block_listener",
|
|
pcs = "receive_block"
|
|
|
|
beacon_blocks_received.inc()
|
|
|
|
if node.blockPool.add(node.stateCache, blockRoot, blck).isNil:
|
|
return
|
|
|
|
# The block we received contains attestations, and we might not yet know about
|
|
# all of them. Let's add them to the attestation pool - in case they block
|
|
# is not yet resolved, neither will the attestations be!
|
|
# TODO shouldn't add attestations if the block turns out to be invalid..
|
|
for attestation in blck.body.attestations:
|
|
node.onAttestation(attestation)
|
|
|
|
proc handleAttestations(node: BeaconNode, head: BlockRef, slot: Slot) =
|
|
## Perform all attestations that the validators attached to this node should
|
|
## perform during the given slot
|
|
logScope: pcs = "on_attestation"
|
|
|
|
if slot + SLOTS_PER_EPOCH < head.slot:
|
|
# The latest block we know about is a lot newer than the slot we're being
|
|
# asked to attest to - this makes it unlikely that it will be included
|
|
# at all.
|
|
# TODO the oldest attestations allowed are those that are older than the
|
|
# finalized epoch.. also, it seems that posting very old attestations
|
|
# is risky from a slashing perspective. More work is needed here.
|
|
notice "Skipping attestation, head is too recent",
|
|
headSlot = shortLog(head.slot),
|
|
slot = shortLog(slot)
|
|
return
|
|
|
|
let attestationHead = head.findAncestorBySlot(slot)
|
|
if head != attestationHead.blck:
|
|
# In rare cases, such as when we're busy syncing or just slow, we'll be
|
|
# attesting to a past state - we must then recreate the world as it looked
|
|
# like back then
|
|
notice "Attesting to a state in the past, falling behind?",
|
|
headSlot = shortLog(head.slot),
|
|
attestationHeadSlot = shortLog(attestationHead.slot),
|
|
attestationSlot = shortLog(slot)
|
|
|
|
trace "Checking attestations",
|
|
attestationHeadRoot = shortLog(attestationHead.blck.root),
|
|
attestationSlot = shortLog(slot),
|
|
cat = "attestation"
|
|
|
|
# Collect data to send before node.stateCache grows stale
|
|
var attestations: seq[tuple[
|
|
data: AttestationData, committeeLen, indexInCommittee: int,
|
|
validator: AttachedValidator]]
|
|
|
|
# We need to run attestations exactly for the slot that we're attesting to.
|
|
# In case blocks went missing, this means advancing past the latest block
|
|
# using empty slots as fillers.
|
|
# https://github.com/ethereum/eth2.0-specs/blob/v0.8.4/specs/validator/0_beacon-chain-validator.md#validator-assignments
|
|
# TODO we could cache the validator assignment since it's valid for the entire
|
|
# epoch since it doesn't change, but that has to be weighed against
|
|
# the complexity of handling forks correctly - instead, we use an adapted
|
|
# version here that calculates the committee for a single slot only
|
|
node.blockPool.withState(node.stateCache, attestationHead):
|
|
var cache = get_empty_per_epoch_cache()
|
|
let
|
|
epoch = compute_epoch_of_slot(slot)
|
|
committees_per_slot = get_committee_count(state, epoch) div SLOTS_PER_EPOCH
|
|
start_slot = compute_start_slot_of_epoch(epoch)
|
|
offset = committees_per_slot * (slot mod SLOTS_PER_EPOCH)
|
|
slot_start_shard = (get_start_shard(state, epoch) + offset) mod SHARD_COUNT
|
|
|
|
for i in 0'u64..<committees_per_slot:
|
|
let
|
|
shard = Shard((slot_start_shard + i) mod SHARD_COUNT)
|
|
committee = get_crosslink_committee(state, epoch, shard, cache)
|
|
|
|
for i, validatorIdx in committee:
|
|
let validator = node.getAttachedValidator(state, validatorIdx)
|
|
if validator != nil:
|
|
let ad = makeAttestationData(state, shard, blck.root)
|
|
attestations.add((ad, committee.len, i, validator))
|
|
|
|
for a in attestations:
|
|
traceAsyncErrors sendAttestation(
|
|
node, state, a.validator, a.data, a.committeeLen, a.indexInCommittee)
|
|
|
|
proc handleProposal(node: BeaconNode, head: BlockRef, slot: Slot):
|
|
Future[BlockRef] {.async.} =
|
|
## Perform the proposal for the given slot, iff we have a validator attached
|
|
## that is supposed to do so, given the shuffling in head
|
|
|
|
# TODO here we advanced the state to the new slot, but later we'll be
|
|
# proposing for it - basically, we're selecting proposer based on an
|
|
# empty slot.. wait for the committee selection to settle, then
|
|
# revisit this - we should be able to advance behind
|
|
var cache = get_empty_per_epoch_cache()
|
|
node.blockPool.withState(node.stateCache, BlockSlot(blck: head, slot: slot)):
|
|
let
|
|
proposerIdx = get_beacon_proposer_index(state, cache)
|
|
validator = node.getAttachedValidator(state, proposerIdx)
|
|
|
|
if validator != nil:
|
|
return await proposeBlock(node, validator, head, slot)
|
|
|
|
trace "Expecting block proposal",
|
|
headRoot = shortLog(head.root),
|
|
slot = shortLog(slot),
|
|
proposer = shortLog(state.validators[proposerIdx].pubKey),
|
|
cat = "consensus",
|
|
pcs = "wait_for_proposal"
|
|
|
|
return head
|
|
|
|
proc onSlotStart(node: BeaconNode, lastSlot, scheduledSlot: Slot) {.gcsafe, async.} =
|
|
## Called at the beginning of a slot - usually every slot, but sometimes might
|
|
## skip a few in case we're running late.
|
|
## lastSlot: the last slot that we sucessfully processed, so we know where to
|
|
## start work from
|
|
## scheduledSlot: the slot that we were aiming for, in terms of timing
|
|
|
|
logScope: pcs = "slot_start"
|
|
|
|
let
|
|
# The slot we should be at, according to the clock
|
|
beaconTime = node.beaconClock.now()
|
|
wallSlot = beaconTime.toSlot()
|
|
|
|
debug "Slot start",
|
|
lastSlot = shortLog(lastSlot),
|
|
scheduledSlot = shortLog(scheduledSlot),
|
|
beaconTime = shortLog(beaconTime),
|
|
peers = node.network.peersCount,
|
|
cat = "scheduling"
|
|
|
|
if not wallSlot.afterGenesis or (wallSlot.slot < lastSlot):
|
|
# This can happen if the system clock changes time for example, and it's
|
|
# pretty bad
|
|
# TODO shut down? time either was or is bad, and PoS relies on accuracy..
|
|
warn "Beacon clock time moved back, rescheduling slot actions",
|
|
beaconTime = shortLog(beaconTime),
|
|
lastSlot = shortLog(lastSlot),
|
|
scheduledSlot = shortLog(scheduledSlot),
|
|
cat = "clock_drift" # tag "scheduling|clock_drift"?
|
|
|
|
let
|
|
slot = Slot(
|
|
if wallSlot.afterGenesis:
|
|
max(1'u64, wallSlot.slot.uint64)
|
|
else: GENESIS_SLOT.uint64 + 1)
|
|
nextSlot = slot + 1
|
|
|
|
addTimer(saturate(node.beaconClock.fromNow(nextSlot))) do (p: pointer):
|
|
asyncCheck node.onSlotStart(slot, nextSlot)
|
|
|
|
return
|
|
|
|
let
|
|
slot = wallSlot.slot # afterGenesis == true!
|
|
nextSlot = slot + 1
|
|
|
|
beacon_slot.set slot.int64
|
|
|
|
if slot > lastSlot + SLOTS_PER_EPOCH:
|
|
# We've fallen behind more than an epoch - there's nothing clever we can
|
|
# do here really, except skip all the work and try again later.
|
|
# TODO how long should the period be? Using an epoch because that's roughly
|
|
# how long attestations remain interesting
|
|
# TODO should we shut down instead? clearly we're unable to keep up
|
|
warn "Unable to keep up, skipping ahead without doing work",
|
|
lastSlot = shortLog(lastSlot),
|
|
slot = shortLog(slot),
|
|
scheduledSlot = shortLog(scheduledSlot),
|
|
cat = "overload"
|
|
|
|
addTimer(saturate(node.beaconClock.fromNow(nextSlot))) do (p: pointer):
|
|
# We pass the current slot here to indicate that work should be skipped!
|
|
asyncCheck node.onSlotStart(slot, nextSlot)
|
|
return
|
|
|
|
# Whatever we do during the slot, we need to know the head, because this will
|
|
# give us a state to work with and thus a shuffling.
|
|
# TODO typically, what consitutes correct actions stays constant between slot
|
|
# updates and is stable across some epoch transitions as well - see how
|
|
# we can avoid recalculating everything here
|
|
|
|
var head = node.updateHead(slot)
|
|
|
|
# TODO if the head is very old, that is indicative of something being very
|
|
# wrong - us being out of sync or disconnected from the network - need
|
|
# to consider what to do in that case:
|
|
# * nothing - the other parts of the application will reconnect and
|
|
# start listening to broadcasts, learn a new head etc..
|
|
# risky, because the network might stall if everyone does
|
|
# this, because no blocks will be produced
|
|
# * shut down - this allows the user to notice and take action, but is
|
|
# kind of harsh
|
|
# * keep going - we create blocks and attestations as usual and send them
|
|
# out - if network conditions improve, fork choice should
|
|
# eventually select the correct head and the rest will
|
|
# disappear naturally - risky because user is not aware,
|
|
# and might lose stake on canonical chain but "just works"
|
|
# when reconnected..
|
|
# Right now, we keep going
|
|
|
|
var curSlot = lastSlot + 1
|
|
while curSlot < slot:
|
|
# Timers may be delayed because we're busy processing, and we might have
|
|
# more work to do. We'll try to do so in an expedited way.
|
|
# TODO maybe even collect all work synchronously to avoid unnecessary
|
|
# state rewinds while waiting for async operations like validator
|
|
# signature..
|
|
notice "Catching up",
|
|
curSlot = shortLog(curSlot),
|
|
lastSlot = shortLog(lastSlot),
|
|
slot = shortLog(slot),
|
|
cat = "overload"
|
|
|
|
# For every slot we're catching up, we'll propose then send
|
|
# attestations - head should normally be advancing along the same branch
|
|
# in this case
|
|
# TODO what if we receive blocks / attestations while doing this work?
|
|
head = await handleProposal(node, head, curSlot)
|
|
|
|
# For each slot we missed, we need to send out attestations - if we were
|
|
# proposing during this time, we'll use the newly proposed head, else just
|
|
# keep reusing the same - the attestation that goes out will actually
|
|
# rewind the state to what it looked like at the time of that slot
|
|
# TODO smells like there's an optimization opportunity here
|
|
handleAttestations(node, head, curSlot)
|
|
|
|
curSlot += 1
|
|
|
|
head = await handleProposal(node, head, slot)
|
|
|
|
# We've been doing lots of work up until now which took time. Normally, we
|
|
# send out attestations at the slot mid-point, so we go back to the clock
|
|
# to see how much time we need to wait.
|
|
# TODO the beacon clock might jump here also. It's probably easier to complete
|
|
# the work for the whole slot using a monotonic clock instead, then deal
|
|
# with any clock discrepancies once only, at the start of slot timer
|
|
# processing..
|
|
let
|
|
attestationStart = node.beaconClock.fromNow(slot)
|
|
halfSlot = seconds(int64(SECONDS_PER_SLOT div 2))
|
|
|
|
if attestationStart.inFuture or attestationStart.offset <= halfSlot:
|
|
let fromNow =
|
|
if attestationStart.inFuture: attestationStart.offset + halfSlot
|
|
else: halfSlot - attestationStart.offset
|
|
|
|
trace "Waiting to send attestations",
|
|
slot = shortLog(slot),
|
|
fromNow = shortLog(fromNow),
|
|
cat = "scheduling"
|
|
|
|
await sleepAsync(fromNow)
|
|
|
|
# Time passed - we might need to select a new head in that case
|
|
head = node.updateHead(slot)
|
|
|
|
handleAttestations(node, head, slot)
|
|
|
|
# TODO ... and beacon clock might jump here also. sigh.
|
|
let
|
|
nextSlotStart = saturate(node.beaconClock.fromNow(nextSlot))
|
|
|
|
addTimer(nextSlotStart) do (p: pointer):
|
|
asyncCheck node.onSlotStart(slot, nextSlot)
|
|
|
|
proc onSecond(node: BeaconNode, moment: Moment) {.async.} =
|
|
let missingBlocks = node.blockPool.checkMissing()
|
|
if missingBlocks.len > 0:
|
|
info "Requesting detected missing blocks", missingBlocks
|
|
node.requestManager.fetchAncestorBlocks(missingBlocks) do (b: BeaconBlock):
|
|
onBeaconBlock(node ,b)
|
|
|
|
let nextSecond = max(Moment.now(), moment + chronos.seconds(1))
|
|
addTimer(nextSecond) do (p: pointer):
|
|
asyncCheck node.onSecond(nextSecond)
|
|
|
|
proc run*(node: BeaconNode) =
|
|
waitFor node.network.subscribe(topicBeaconBlocks) do (blck: BeaconBlock):
|
|
onBeaconBlock(node, blck)
|
|
|
|
waitFor node.network.subscribe(topicAttestations) do (attestation: Attestation):
|
|
node.onAttestation(attestation)
|
|
|
|
let
|
|
t = node.beaconClock.now()
|
|
startSlot = if t > BeaconTime(0): t.toSlot.slot + 1
|
|
else: GENESIS_SLOT + 1
|
|
fromNow = saturate(node.beaconClock.fromNow(startSlot))
|
|
|
|
info "Scheduling first slot action",
|
|
beaconTime = shortLog(node.beaconClock.now()),
|
|
nextSlot = shortLog(startSlot),
|
|
fromNow = shortLog(fromNow),
|
|
cat = "scheduling"
|
|
|
|
addTimer(fromNow) do (p: pointer):
|
|
asyncCheck node.onSlotStart(startSlot - 1, startSlot)
|
|
|
|
let second = Moment.now() + chronos.seconds(1)
|
|
addTimer(second) do (p: pointer):
|
|
asyncCheck node.onSecond(second)
|
|
|
|
runForever()
|
|
|
|
var gPidFile: string
|
|
proc createPidFile(filename: string) =
|
|
createDir splitFile(filename).dir
|
|
writeFile filename, $os.getCurrentProcessId()
|
|
gPidFile = filename
|
|
addQuitProc proc {.noconv.} = removeFile gPidFile
|
|
|
|
proc start(node: BeaconNode, headState: BeaconState) =
|
|
# TODO: while it's nice to cheat by waiting for connections here, we
|
|
# actually need to make this part of normal application flow -
|
|
# losing all connections might happen at any time and we should be
|
|
# prepared to handle it.
|
|
waitFor node.connectToNetwork()
|
|
|
|
info "Starting beacon node",
|
|
timeSinceFinalization =
|
|
int64(node.blockPool.finalizedHead.slot.toBeaconTime()) -
|
|
int64(node.beaconClock.now()),
|
|
stateSlot = shortLog(headState.slot),
|
|
SHARD_COUNT,
|
|
SLOTS_PER_EPOCH,
|
|
SECONDS_PER_SLOT,
|
|
SPEC_VERSION,
|
|
dataDir = node.config.dataDir.string,
|
|
cat = "init",
|
|
pcs = "start_beacon_node"
|
|
|
|
node.addLocalValidators(headState)
|
|
node.run()
|
|
|
|
func formatGwei(amount: uint64): string =
|
|
# TODO This is implemented in a quite a silly way.
|
|
# Better routines for formatting decimal numbers
|
|
# should exists somewhere else.
|
|
let
|
|
eth = amount div 1000000000
|
|
remainder = amount mod 1000000000
|
|
|
|
result = $eth
|
|
if remainder != 0:
|
|
result.add '.'
|
|
result.add $remainder
|
|
while result[^1] == '0':
|
|
result.setLen(result.len - 1)
|
|
|
|
when hasPrompt:
|
|
from unicode import Rune
|
|
import terminal, prompt
|
|
|
|
proc providePromptCompletions*(line: seq[Rune], cursorPos: int): seq[string] =
|
|
# TODO
|
|
# The completions should be generated with the general-purpose command-line
|
|
# parsing API of Confutils
|
|
result = @[]
|
|
|
|
proc processPromptCommands(p: ptr Prompt) {.thread.} =
|
|
while true:
|
|
var cmd = p[].readLine()
|
|
case cmd
|
|
of "quit":
|
|
quit 0
|
|
else:
|
|
p[].writeLine("Unknown command: " & cmd)
|
|
|
|
proc slotOrZero(time: BeaconTime): Slot =
|
|
let exSlot = time.toSlot
|
|
if exSlot.afterGenesis: exSlot.slot
|
|
else: Slot(0)
|
|
|
|
proc initPrompt(node: BeaconNode) =
|
|
if isatty(stdout) and node.config.statusbar:
|
|
enableTrueColors()
|
|
|
|
# TODO: nim-prompt seems to have threading issues at the moment
|
|
# which result in sporadic crashes. We should introduce a
|
|
# lock that guards the access to the internal prompt line
|
|
# variable.
|
|
#
|
|
# var p = Prompt.init("nimbus > ", providePromptCompletions)
|
|
# p.useHistoryFile()
|
|
|
|
proc dataResolver(expr: string): string =
|
|
# TODO:
|
|
# We should introduce a general API for resolving dot expressions
|
|
# such as `db.latest_block.slot` or `metrics.connected_peers`.
|
|
# Such an API can be shared between the RPC back-end, CLI tools
|
|
# such as ncli, a potential GraphQL back-end and so on.
|
|
# The status bar feature would allow the user to specify an
|
|
# arbitrary expression that is resolvable through this API.
|
|
case expr.toLowerAscii
|
|
of "connected_peers":
|
|
$(sync_protocol.libp2p_peers.value.int)
|
|
|
|
of "last_finalized_epoch":
|
|
var head = node.blockPool.finalizedHead
|
|
# TODO: Should we display a state root instead?
|
|
$(head.slot.epoch) & " (" & shortLog(head.blck.root) & ")"
|
|
|
|
of "epoch":
|
|
$node.beaconClock.now.slotOrZero.epoch
|
|
|
|
of "epoch_slot":
|
|
$(node.beaconClock.now.slotOrZero mod SLOTS_PER_EPOCH)
|
|
|
|
of "slots_per_epoch":
|
|
$SLOTS_PER_EPOCH
|
|
|
|
of "slot_trailing_digits":
|
|
var slotStr = $node.beaconClock.now.slotOrZero
|
|
if slotStr.len > 3: slotStr = slotStr[^3..^1]
|
|
slotStr
|
|
|
|
of "attached_validators_balance":
|
|
var balance = uint64(0)
|
|
for _, validator in node.attachedValidators.validators:
|
|
balance += node.stateCache.data.data.balances[validator.idx]
|
|
formatGwei(balance)
|
|
|
|
else:
|
|
# We ignore typos for now and just render the expression
|
|
# as it was written. TODO: come up with a good way to show
|
|
# an error message to the user.
|
|
"$" & expr
|
|
|
|
var statusBar = StatusBarView.init(
|
|
node.config.statusbarContents,
|
|
dataResolver)
|
|
|
|
defaultChroniclesStream.output.writer =
|
|
proc (logLevel: LogLevel, msg: LogOutputStr) {.gcsafe.} =
|
|
# p.hidePrompt
|
|
erase statusBar
|
|
# p.writeLine msg
|
|
stdout.write msg
|
|
render statusBar
|
|
# p.showPrompt
|
|
|
|
proc statusBarUpdatesPollingLoop() {.async.} =
|
|
while true:
|
|
update statusBar
|
|
await sleepAsync(1000)
|
|
|
|
traceAsyncErrors statusBarUpdatesPollingLoop()
|
|
|
|
# var t: Thread[ptr Prompt]
|
|
# createThread(t, processPromptCommands, addr p)
|
|
|
|
when isMainModule:
|
|
randomize()
|
|
let config = BeaconNodeConf.load(version = fullVersionStr())
|
|
|
|
doAssert defaultChroniclesStream.outputs.len > 0
|
|
doAssert defaultChroniclesStream.output is DynamicOutput
|
|
|
|
defaultChroniclesStream.output.writer =
|
|
proc (logLevel: LogLevel, msg: LogOutputStr) {.gcsafe.} =
|
|
stdout.write(msg)
|
|
|
|
if config.logLevel != LogLevel.NONE:
|
|
setLogLevel(config.logLevel)
|
|
|
|
## Ctrl+C handling
|
|
proc controlCHandler() {.noconv.} =
|
|
when defined(windows):
|
|
# workaround for https://github.com/nim-lang/Nim/issues/4057
|
|
setupForeignThreadGc()
|
|
debug "Shutting down after having received SIGINT"
|
|
quit(1)
|
|
setControlCHook(controlCHandler)
|
|
|
|
case config.cmd
|
|
of createTestnet:
|
|
var deposits: seq[Deposit]
|
|
for i in config.firstValidator.int ..< config.totalValidators.int:
|
|
let depositFile = config.validatorsDir /
|
|
validatorFileBaseName(i) & ".deposit.json"
|
|
try:
|
|
deposits.add Json.loadFile(depositFile, Deposit)
|
|
except SerializationError as err:
|
|
stderr.write "Error while loading a deposit file:\n"
|
|
stderr.write err.formatMsg(depositFile), "\n"
|
|
stderr.write "Please regenerate the deposit files by running makeDeposits again\n"
|
|
quit 1
|
|
|
|
var
|
|
startTime = uint64(times.toUnix(times.getTime()) + config.genesisOffset)
|
|
initialState = initialize_beacon_state_from_eth1(
|
|
eth1BlockHash, startTime, deposits, {skipValidation})
|
|
|
|
# https://github.com/ethereum/eth2.0-pm/tree/6e41fcf383ebeb5125938850d8e9b4e9888389b4/interop/mocked_start#create-genesis-state
|
|
initialState.genesis_time = startTime
|
|
|
|
doAssert initialState.validators.len > 0
|
|
|
|
Json.saveFile(config.outputGenesis.string, initialState, pretty = true)
|
|
echo "Wrote ", config.outputGenesis.string
|
|
|
|
let sszGenesis = config.outputGenesis.string.changeFileExt "ssz"
|
|
SSZ.saveFile(sszGenesis, initialState)
|
|
echo "Wrote ", sszGenesis
|
|
|
|
var
|
|
bootstrapAddress = getPersistenBootstrapAddr(
|
|
config, parseIpAddress(config.bootstrapAddress), Port config.bootstrapPort)
|
|
|
|
testnetMetadata = NetworkMetadata(
|
|
networkGeneration: semanticVersion,
|
|
genesisRoot:
|
|
if config.withGenesisRoot:
|
|
some(hash_tree_root(initialState))
|
|
else: none(Eth2Digest),
|
|
bootstrapNodes: @[bootstrapAddress],
|
|
numShards: SHARD_COUNT,
|
|
slotDuration: SECONDS_PER_SLOT,
|
|
slotsPerEpoch: SLOTS_PER_EPOCH,
|
|
totalValidators: config.totalValidators,
|
|
lastUserValidator: config.lastUserValidator)
|
|
|
|
Json.saveFile(config.outputNetworkMetadata.string, testnetMetadata, pretty = true)
|
|
echo "Wrote ", config.outputNetworkMetadata.string
|
|
|
|
let bootstrapFile = config.outputBootstrapNodes.string
|
|
if bootstrapFile.len > 0:
|
|
let bootstrapAddrLine = when networkBackend == libp2pBackend:
|
|
$bootstrapAddress.addresses[0] & "/p2p/" & bootstrapAddress.peer.pretty
|
|
else:
|
|
$bootstrapAddress
|
|
writeFile(bootstrapFile, bootstrapAddrLine)
|
|
echo "Wrote ", bootstrapFile
|
|
|
|
of updateTestnet:
|
|
discard waitFor updateTestnetMetadata(config)
|
|
|
|
of importValidator:
|
|
template reportFailureFor(keyExpr) =
|
|
error "Failed to import validator key", key = keyExpr
|
|
programResult = 1
|
|
|
|
for keyFile in config.keyFiles:
|
|
try:
|
|
saveValidatorKey(keyFile.string.extractFilename,
|
|
readFile(keyFile.string), config)
|
|
except:
|
|
reportFailureFor keyFile.string
|
|
|
|
if config.keyFiles.len == 0:
|
|
if config.network in ["testnet0", "testnet1"]:
|
|
try:
|
|
let (keyName, key) = waitFor obtainTestnetKey(config)
|
|
saveValidatorKey(keyName, key, config)
|
|
except:
|
|
stderr.write "Failed to download key\n", getCurrentExceptionMsg()
|
|
quit 1
|
|
else:
|
|
echo "Validator keys can be downloaded only for testnets"
|
|
quit 1
|
|
|
|
of noCommand:
|
|
createPidFile(config.dataDir.string / "beacon_node.pid")
|
|
|
|
var node = waitFor BeaconNode.init(config)
|
|
when hasPrompt: initPrompt(node)
|
|
|
|
# TODO slightly ugly to rely on node.stateCache state here..
|
|
if node.nickname != "":
|
|
dynamicLogScope(node = node.nickname): node.start(node.stateCache.data.data)
|
|
else:
|
|
node.start(node.stateCache.data.data)
|
|
|
|
of makeDeposits:
|
|
let deposits = generateDeposits(
|
|
config.totalDeposits, config.depositsDir, config.randomKeys)
|
|
|
|
if config.depositWeb3Url.len() > 0 and config.depositContractAddress.len() > 0:
|
|
waitFor sendDeposits(
|
|
deposits, config.depositWeb3Url, config.depositContractAddress)
|