344 lines
12 KiB
Nim
344 lines
12 KiB
Nim
# beacon_chain
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# Copyright (c) 2022-2024 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [].}
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import
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std/os,
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chronicles, chronos, stew/io2,
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eth/db/kvstore_sqlite3,
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./el/el_manager,
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./gossip_processing/optimistic_processor,
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./networking/[topic_params, network_metadata_downloads],
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./spec/beaconstate,
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./spec/datatypes/[phase0, altair, bellatrix, capella, deneb],
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"."/[filepath, light_client, light_client_db, nimbus_binary_common, version]
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from ./gossip_processing/block_processor import newExecutionPayload
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from ./gossip_processing/eth2_processor import toValidationResult
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# this needs to be global, so it can be set in the Ctrl+C signal handler
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var globalRunning = true
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programMain:
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## Ctrl+C handling
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proc controlCHandler() {.noconv.} =
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when defined(windows):
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# workaround for https://github.com/nim-lang/Nim/issues/4057
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try:
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setupForeignThreadGc()
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except Exception as exc: raiseAssert exc.msg # shouldn't happen
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notice "Shutting down after having received SIGINT"
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globalRunning = false
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try:
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setControlCHook(controlCHandler)
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except Exception as exc: # TODO Exception
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warn "Cannot set ctrl-c handler", msg = exc.msg
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var config = makeBannerAndConfig(
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"Nimbus light client " & fullVersionStr, LightClientConf)
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setupLogging(config.logLevel, config.logStdout, config.logFile)
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notice "Launching light client",
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version = fullVersionStr, cmdParams = commandLineParams(), config
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let dbDir = config.databaseDir
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if (let res = secureCreatePath(dbDir); res.isErr):
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fatal "Failed to create create database directory",
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path = dbDir, err = ioErrorMsg(res.error)
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quit 1
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let backend = SqStoreRef.init(dbDir, "nlc").expect("Database OK")
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defer: backend.close()
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let db = backend.initLightClientDB(LightClientDBNames(
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legacyAltairHeaders: "altair_lc_headers",
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headers: "lc_headers",
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altairSyncCommittees: "altair_sync_committees")).expect("Database OK")
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defer: db.close()
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let metadata = loadEth2Network(config.eth2Network)
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for node in metadata.bootstrapNodes:
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config.bootstrapNodes.add node
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template cfg(): auto = metadata.cfg
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let
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genesisBytes = try: waitFor metadata.fetchGenesisBytes()
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except CatchableError as err:
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error "Failed to obtain genesis state",
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source = metadata.genesis.sourceDesc,
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err = err.msg
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quit 1
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genesisState =
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try:
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newClone(readSszForkedHashedBeaconState(cfg, genesisBytes))
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except CatchableError as err:
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raiseAssert "Invalid baked-in state: " & err.msg
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genesisTime = getStateField(genesisState[], genesis_time)
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beaconClock = BeaconClock.init(genesisTime).valueOr:
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error "Invalid genesis time in state", genesisTime
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quit 1
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getBeaconTime = beaconClock.getBeaconTimeFn()
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genesis_validators_root =
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getStateField(genesisState[], genesis_validators_root)
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forkDigests = newClone ForkDigests.init(cfg, genesis_validators_root)
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genesisBlockRoot = get_initial_beacon_block(genesisState[]).root
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rng = HmacDrbgContext.new()
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netKeys = getRandomNetKeys(rng[])
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network = createEth2Node(
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rng, config, netKeys, cfg,
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forkDigests, getBeaconTime, genesis_validators_root)
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engineApiUrls = config.engineApiUrls
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elManager =
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if engineApiUrls.len > 0:
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ELManager.new(
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cfg,
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metadata.depositContractBlock,
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metadata.depositContractBlockHash,
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db = nil,
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engineApiUrls,
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metadata.eth1Network)
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else:
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nil
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optimisticHandler = proc(signedBlock: ForkedMsgTrustedSignedBeaconBlock):
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Future[void] {.async: (raises: [CancelledError]).} =
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notice "New LC optimistic block",
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opt = signedBlock.toBlockId(),
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wallSlot = getBeaconTime().slotOrZero
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withBlck(signedBlock):
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when consensusFork >= ConsensusFork.Bellatrix:
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if forkyBlck.message.is_execution_block:
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template payload(): auto = forkyBlck.message.body.execution_payload
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if elManager != nil and not payload.block_hash.isZero:
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discard await elManager.newExecutionPayload(forkyBlck.message)
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discard await elManager.forkchoiceUpdated(
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headBlockHash = payload.block_hash,
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safeBlockHash = payload.block_hash, # stub value
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finalizedBlockHash = ZERO_HASH,
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payloadAttributes = Opt.none(consensusFork.PayloadAttributes))
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else: discard
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optimisticProcessor = initOptimisticProcessor(
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getBeaconTime, optimisticHandler)
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lightClient = createLightClient(
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network, rng, config, cfg, forkDigests, getBeaconTime,
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genesis_validators_root, LightClientFinalizationMode.Optimistic)
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# Run `exchangeTransitionConfiguration` loop
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if elManager != nil:
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elManager.start(syncChain = false)
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info "Listening to incoming network requests"
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network.registerProtocol(
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PeerSync, PeerSync.NetworkState.init(
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cfg, forkDigests, genesisBlockRoot, getBeaconTime))
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withAll(ConsensusFork):
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let forkDigest = forkDigests[].atConsensusFork(consensusFork)
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network.addValidator(
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getBeaconBlocksTopic(forkDigest), proc (
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signedBlock: consensusFork.SignedBeaconBlock
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): ValidationResult =
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toValidationResult(
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optimisticProcessor.processSignedBeaconBlock(signedBlock)))
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lightClient.installMessageValidators()
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waitFor network.startListening()
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waitFor network.start()
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proc onFinalizedHeader(
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lightClient: LightClient, finalizedHeader: ForkedLightClientHeader) =
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withForkyHeader(finalizedHeader):
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when lcDataFork > LightClientDataFork.None:
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info "New LC finalized header",
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finalized_header = shortLog(forkyHeader)
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let
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period = forkyHeader.beacon.slot.sync_committee_period
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syncCommittee = lightClient.finalizedSyncCommittee.expect("Init OK")
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db.putSyncCommittee(period, syncCommittee)
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db.putLatestFinalizedHeader(finalizedHeader)
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proc onOptimisticHeader(
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lightClient: LightClient, optimisticHeader: ForkedLightClientHeader) =
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withForkyHeader(optimisticHeader):
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when lcDataFork > LightClientDataFork.None:
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info "New LC optimistic header",
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optimistic_header = shortLog(forkyHeader)
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optimisticProcessor.setOptimisticHeader(forkyHeader.beacon)
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lightClient.onFinalizedHeader = onFinalizedHeader
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lightClient.onOptimisticHeader = onOptimisticHeader
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lightClient.trustedBlockRoot = some config.trustedBlockRoot
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let latestHeader = db.getLatestFinalizedHeader()
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withForkyHeader(latestHeader):
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when lcDataFork > LightClientDataFork.None:
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let
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period = forkyHeader.beacon.slot.sync_committee_period
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syncCommittee = db.getSyncCommittee(period)
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if syncCommittee.isErr:
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error "LC store lacks sync committee", finalized_header = forkyHeader
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else:
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lightClient.resetToFinalizedHeader(latestHeader, syncCommittee.get)
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# Full blocks gossip is required to portably drive an EL client:
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# - EL clients may not sync when only driven with `forkChoiceUpdated`,
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# e.g., Geth: "Forkchoice requested unknown head"
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# - `newPayload` requires the full `ExecutionPayload` (most of block content)
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# - `ExecutionPayload` block hash is not available in
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# `altair.LightClientHeader`, so won't be exchanged via light client gossip
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#
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# Future `ethereum/consensus-specs` versions may remove need for full blocks.
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# Therefore, this current mechanism is to be seen as temporary; it is not
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# optimized for reducing code duplication, e.g., with `nimbus_beacon_node`.
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func isSynced(wallSlot: Slot): bool =
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let optimisticHeader = lightClient.optimisticHeader
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withForkyHeader(optimisticHeader):
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when lcDataFork > LightClientDataFork.None:
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# Check whether light client has synced sufficiently close to wall slot
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const maxAge = 2 * SLOTS_PER_EPOCH
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forkyHeader.beacon.slot >= max(wallSlot, maxAge.Slot) - maxAge
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else:
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false
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func shouldSyncOptimistically(wallSlot: Slot): bool =
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# Check whether an EL is connected
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if elManager == nil:
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return false
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isSynced(wallSlot)
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var blocksGossipState: GossipState = {}
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proc updateBlocksGossipStatus(slot: Slot) =
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let
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isBehind = not shouldSyncOptimistically(slot)
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targetGossipState = getTargetGossipState(
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slot.epoch, cfg.ALTAIR_FORK_EPOCH, cfg.BELLATRIX_FORK_EPOCH,
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cfg.CAPELLA_FORK_EPOCH, cfg.DENEB_FORK_EPOCH, FAR_FUTURE_EPOCH,
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isBehind)
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template currentGossipState(): auto = blocksGossipState
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if currentGossipState == targetGossipState:
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return
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if currentGossipState.card == 0 and targetGossipState.card > 0:
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debug "Enabling blocks topic subscriptions",
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wallSlot = slot, targetGossipState
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elif currentGossipState.card > 0 and targetGossipState.card == 0:
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debug "Disabling blocks topic subscriptions",
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wallSlot = slot
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else:
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# Individual forks added / removed
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discard
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let
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newGossipForks = targetGossipState - currentGossipState
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oldGossipForks = currentGossipState - targetGossipState
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for gossipFork in oldGossipForks:
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let forkDigest = forkDigests[].atConsensusFork(gossipFork)
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network.unsubscribe(getBeaconBlocksTopic(forkDigest))
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for gossipFork in newGossipForks:
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let forkDigest = forkDigests[].atConsensusFork(gossipFork)
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network.subscribe(
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getBeaconBlocksTopic(forkDigest), blocksTopicParams,
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enableTopicMetrics = true)
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blocksGossipState = targetGossipState
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proc onSlot(wallTime: BeaconTime, lastSlot: Slot) =
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let
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wallSlot = wallTime.slotOrZero()
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expectedSlot = lastSlot + 1
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delay = wallTime - expectedSlot.start_beacon_time()
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finalizedHeader = lightClient.finalizedHeader
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optimisticHeader = lightClient.optimisticHeader
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finalizedBid = withForkyHeader(finalizedHeader):
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when lcDataFork > LightClientDataFork.None:
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forkyHeader.beacon.toBlockId()
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else:
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BlockId(root: genesisBlockRoot, slot: GENESIS_SLOT)
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optimisticBid = withForkyHeader(optimisticHeader):
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when lcDataFork > LightClientDataFork.None:
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forkyHeader.beacon.toBlockId()
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else:
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BlockId(root: genesisBlockRoot, slot: GENESIS_SLOT)
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syncStatus =
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if optimisticHeader.kind == LightClientDataFork.None:
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"bootstrapping(" & $config.trustedBlockRoot & ")"
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elif not isSynced(wallSlot):
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"syncing"
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else:
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"synced"
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info "Slot start",
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slot = shortLog(wallSlot),
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epoch = shortLog(wallSlot.epoch),
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sync = syncStatus,
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peers = len(network.peerPool),
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head = shortLog(optimisticBid),
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finalized = shortLog(finalizedBid),
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delay = shortLog(delay)
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proc runOnSlotLoop() {.async.} =
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var
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curSlot = getBeaconTime().slotOrZero()
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nextSlot = curSlot + 1
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timeToNextSlot = nextSlot.start_beacon_time() - getBeaconTime()
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while true:
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await sleepAsync(timeToNextSlot)
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let
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wallTime = getBeaconTime()
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wallSlot = wallTime.slotOrZero()
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onSlot(wallTime, curSlot)
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curSlot = wallSlot
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nextSlot = wallSlot + 1
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timeToNextSlot = nextSlot.start_beacon_time() - getBeaconTime()
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proc onSecond(time: Moment) =
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let wallSlot = getBeaconTime().slotOrZero()
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if checkIfShouldStopAtEpoch(wallSlot, config.stopAtEpoch):
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quit(0)
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updateBlocksGossipStatus(wallSlot + 1)
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lightClient.updateGossipStatus(wallSlot + 1)
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proc runOnSecondLoop() {.async.} =
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let sleepTime = chronos.seconds(1)
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while true:
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let start = chronos.now(chronos.Moment)
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await chronos.sleepAsync(sleepTime)
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let afterSleep = chronos.now(chronos.Moment)
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let sleepTime = afterSleep - start
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onSecond(start)
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let finished = chronos.now(chronos.Moment)
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let processingTime = finished - afterSleep
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trace "onSecond task completed", sleepTime, processingTime
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onSecond(Moment.now())
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lightClient.start()
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asyncSpawn runOnSlotLoop()
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asyncSpawn runOnSecondLoop()
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while globalRunning:
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poll()
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notice "Exiting light client"
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