# beacon_chain # Copyright (c) 2018-2024 Status Research & Development GmbH # Licensed and distributed under either of # * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT). # * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0). # at your option. This file may not be copied, modified, or distributed except according to those terms. {.push raises: [].} import stew/[base10, results], chronicles, chronos, eth/async_utils, ./sync/[light_client_sync_helpers, sync_manager], ./consensus_object_pools/[block_clearance, blockchain_dag], ./spec/eth2_apis/rest_beacon_client, ./spec/[beaconstate, eth2_merkleization, forks, light_client_sync, network, presets, state_transition, deposit_snapshots], "."/[beacon_clock, beacon_chain_db, era_db] from presto import RestDecodingError const largeRequestsTimeout = 60.seconds # Downloading large items such as states. smallRequestsTimeout = 30.seconds # Downloading smaller items such as blocks and deposit snapshots. proc fetchDepositSnapshot(client: RestClientRef): Future[Result[DepositTreeSnapshot, string]] {.async.} = let resp = try: awaitWithTimeout(client.getDepositSnapshot(), smallRequestsTimeout): return err "Fetching /eth/v1/beacon/deposit_snapshot timed out" except CatchableError as e: return err("The trusted node likely does not support the /eth/v1/beacon/deposit_snapshot end-point:" & e.msg) let data = resp.data.data let snapshot = DepositTreeSnapshot( eth1Block: data.execution_block_hash, depositContractState: DepositContractState( branch: data.finalized, deposit_count: depositCountBytes(data.deposit_count)), blockHeight: data.execution_block_height) if not snapshot.isValid(data.deposit_root): return err "The obtained deposit snapshot contains self-contradictory data" return ok snapshot from ./spec/datatypes/deneb import asSigVerified, shortLog type TrustedNodeSyncKind* {.pure.} = enum TrustedBlockRoot, StateId TrustedNodeSyncTarget* = object case kind*: TrustedNodeSyncKind of TrustedNodeSyncKind.TrustedBlockRoot: trustedBlockRoot*: Eth2Digest of TrustedNodeSyncKind.StateId: stateId*: string func shortLog*(v: TrustedNodeSyncTarget): auto = case v.kind of TrustedNodeSyncKind.TrustedBlockRoot: "trustedBlockRoot(" & $v.trustedBlockRoot & ")" of TrustedNodeSyncKind.StateId: v.stateId chronicles.formatIt(TrustedNodeSyncTarget): shortLog(it) proc doTrustedNodeSync*( db: BeaconChainDB, cfg: RuntimeConfig, databaseDir: string, eraDir: string, restUrl: string, syncTarget: TrustedNodeSyncTarget, backfill: bool, reindex: bool, downloadDepositSnapshot: bool, genesisState: ref ForkedHashedBeaconState = nil) {.async.} = logScope: restUrl syncTarget notice "Starting trusted node sync", databaseDir, backfill, reindex var client = RestClientRef.new(restUrl).valueOr: error "Cannot connect to server", error = error quit 1 # If possible, we'll store the genesis state in the database - this is not # strictly necessary but renders the resulting database compatible with # versions prior to 22.11 and makes reindexing possible let genesisState = if (let genesisRoot = db.getGenesisBlock(); genesisRoot.isSome()): let genesisBlock = db.getForkedBlock(genesisRoot.get()).valueOr: error "Cannot load genesis block from database", genesisRoot = genesisRoot.get() quit 1 genesisStateRoot = getForkedBlockField(genesisBlock, state_root) consensusFork = cfg.consensusForkAtEpoch(GENESIS_EPOCH) tmp = (ref ForkedHashedBeaconState)(kind: consensusFork) if not db.getState(consensusFork, genesisStateRoot, tmp[], noRollback): error "Cannot load genesis state from database", genesisStateRoot quit 1 if (genesisState != nil) and (getStateRoot(tmp[]) != getStateRoot(genesisState[])): error "Unexpected genesis state in database, is this the same network?", databaseRoot = getStateRoot(tmp[]), genesisRoot = getStateRoot(genesisState[]) quit 1 tmp else: let tmp = if genesisState != nil: genesisState else: case syncTarget.kind of TrustedNodeSyncKind.TrustedBlockRoot: error "Genesis state is required when using `trustedBlockRoot`", missingNetworkMetadataFile = "genesis.ssz" # `genesis_time` and `genesis_validators_root` are required to check # light client data signatures. They are not part of `config.yaml`. # We could download the initial state based on `LightClientBootstrap` # `state_root`, but that state is unlikely to be readily available and # can be much larger than the genesis state. Furthermore, the major # known networks bundle the `genesis.ssz` file with network metadata, # so adding this complexity doesn't solve a practical usecase. Users # on private networks may obtain a trusted `genesis.ssz` file and mark # it as trusted by moving it into the network metadata folder. # # Note that `historical_roots` / `historical_summaries` may be used to # prove correctness of a particular genesis state. However, there is # currently no endpoint to obtain proofs, and they change for every # slot, making it tricky to actually provide them. quit 1 of TrustedNodeSyncKind.StateId: notice "Downloading genesis state", restUrl try: awaitWithTimeout( client.getStateV2(StateIdent.init(StateIdentType.Genesis), cfg), largeRequestsTimeout): info "Attempt to download genesis state timed out" # https://github.com/nim-lang/Nim/issues/22180 (ref ForkedHashedBeaconState)(nil) except CatchableError as exc: info "Unable to download genesis state", error = exc.msg, restUrl nil if isNil(tmp): notice "Server is missing genesis state, node will not be able to reindex history", restUrl tmp let dbHead = db.getHeadBlock() head = if dbHead.isSome(): let bid = db.getBlockId(dbHead.get()).valueOr: error "Database missing head block summary - database too old or corrupt", headRoot = dbHead.get() quit 1 Opt.some bid else: # When we don't have a head, we'll use the given checkpoint as head Opt.none(BlockId) if head.isNone: var stateRoot: Opt[Eth2Digest] let stateId = case syncTarget.kind of TrustedNodeSyncKind.TrustedBlockRoot: # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.7/specs/altair/light-client/light-client.md#light-client-sync-process const lcDataFork = LightClientDataFork.high var bestViableCheckpoint: Opt[tuple[slot: Slot, state_root: Eth2Digest]] func trackBestViableCheckpoint(store: lcDataFork.LightClientStore) = if store.finalized_header.beacon.slot.is_epoch: bestViableCheckpoint.ok(( slot: store.finalized_header.beacon.slot, state_root: store.finalized_header.beacon.state_root)) doAssert genesisState != nil, "Already checked for `TrustedBlockRoot`" let genesisTime = getStateField(genesisState[], genesis_time) beaconClock = BeaconClock.init(genesisTime).valueOr: error "Invalid genesis time in state", genesisTime quit 1 getBeaconTime = beaconClock.getBeaconTimeFn() genesis_validators_root = getStateField(genesisState[], genesis_validators_root) forkDigests = newClone ForkDigests.init(cfg, genesis_validators_root) trustedBlockRoot = syncTarget.trustedBlockRoot var bootstrap = try: notice "Downloading LC bootstrap", trustedBlockRoot awaitWithTimeout( client.getLightClientBootstrap( trustedBlockRoot, cfg, forkDigests), smallRequestsTimeout ): error "Attempt to download LC bootstrap timed out" quit 1 except CatchableError as exc: error "Unable to download LC bootstrap", error = exc.msg quit 1 if bootstrap.kind == LightClientDataFork.None: error "LC bootstrap unavailable on server" quit 1 bootstrap.migrateToDataFork(lcDataFork) var storeRes = initialize_light_client_store( trustedBlockRoot, bootstrap.forky(lcDataFork), cfg) if storeRes.isErr: error "`initialize_light_client_store` failed", err = storeRes.error quit 1 template store: auto = storeRes.get store.trackBestViableCheckpoint() while true: let finalized = store.finalized_header.beacon.slot.sync_committee_period optimistic = store.optimistic_header.beacon.slot.sync_committee_period current = getBeaconTime().slotOrZero().sync_committee_period isNextSyncCommitteeKnown = store.is_next_sync_committee_known let periods: Slice[SyncCommitteePeriod] = if finalized == optimistic and not isNextSyncCommitteeKnown: if finalized >= current: finalized .. finalized else: finalized ..< current elif finalized + 1 < current: finalized + 1 ..< current else: break startPeriod = periods.a count = min(periods.len, MAX_REQUEST_LIGHT_CLIENT_UPDATES).uint64 var updates = try: notice "Downloading LC updates", startPeriod, count awaitWithTimeout( client.getLightClientUpdatesByRange( startPeriod, count, cfg, forkDigests), smallRequestsTimeout ): error "Attempt to download LC updates timed out" quit 1 except CatchableError as exc: error "Unable to download LC updates", error = exc.msg quit 1 let e = updates.checkLightClientUpdates(startPeriod, count) if e.isErr: error "Malformed LC updates response", resError = e.error quit 1 if updates.len == 0: warn "Server does not appear to be fully synced" break for i in 0 ..< updates.len: doAssert updates[i].kind > LightClientDataFork.None updates[i].migrateToDataFork(lcDataFork) let res = process_light_client_update( store, updates[i].forky(lcDataFork), getBeaconTime().slotOrZero(), cfg, genesis_validators_root) if not res.isOk: error "`process_light_client_update` failed", resError = res.error quit 1 store.trackBestViableCheckpoint() var finalityUpdate = try: notice "Downloading LC finality update" awaitWithTimeout( client.getLightClientFinalityUpdate(cfg, forkDigests), smallRequestsTimeout ): error "Attempt to download LC finality update timed out" quit 1 except CatchableError as exc: error "Unable to download LC finality update", error = exc.msg quit 1 if bootstrap.kind == LightClientDataFork.None: error "LC finality update unavailable on server" quit 1 finalityUpdate.migrateToDataFork(lcDataFork) let res = process_light_client_update( store, finalityUpdate.forky(lcDataFork), getBeaconTime().slotOrZero(), cfg, genesis_validators_root) if not res.isOk: error "`process_light_client_update` failed", resError = res.error quit 1 store.trackBestViableCheckpoint() if bestViableCheckpoint.isErr: error "CP not on epoch boundary. Retry later", latestCheckpointSlot = store.finalized_header.beacon.slot quit 1 if not store.finalized_header.beacon.slot.is_epoch: warn "CP not on epoch boundary. Using older one", latestCheckpointSlot = store.finalized_header.beacon.slot, bestViableCheckpointSlot = bestViableCheckpoint.get.slot stateRoot.ok bestViableCheckpoint.get.state_root Base10.toString(distinctBase(bestViableCheckpoint.get.slot)) of TrustedNodeSyncKind.StateId: syncTarget.stateId logScope: stateId notice "Downloading checkpoint state" let state = try: let id = block: let tmp = StateIdent.decodeString(stateId).valueOr: error "Cannot decode checkpoint state id, must be a slot, hash, 'finalized' or 'head'" quit 1 if tmp.kind == StateQueryKind.Slot and not tmp.slot.is_epoch(): notice "Rounding given slot to epoch" StateIdent.init(tmp.slot.epoch().start_slot) else: tmp awaitWithTimeout(client.getStateV2(id, cfg), largeRequestsTimeout): error "Attempt to download checkpoint state timed out" quit 1 except CatchableError as exc: error "Unable to download checkpoint state", error = exc.msg quit 1 if state == nil: error "No state found a given checkpoint" quit 1 if stateRoot.isSome: if state[].getStateRoot() != stateRoot.get: error "Checkpoint state has incorrect root!", expectedStateRoot = stateRoot.get, actualStateRoot = state[].getStateRoot() quit 1 info "Checkpoint state validated against LC data", stateRoot = stateRoot.get if not getStateField(state[], slot).is_epoch(): error "State slot must fall on an epoch boundary", slot = getStateField(state[], slot), offset = getStateField(state[], slot) - getStateField(state[], slot).epoch.start_slot quit 1 if genesisState != nil: if getStateField(state[], genesis_time) != getStateField(genesisState[], genesis_time): error "Checkpoint state does not match genesis", timeInCheckpoint = getStateField(state[], genesis_time), timeInGenesis = getStateField(genesisState[], genesis_time) quit 1 if getStateField(state[], genesis_validators_root) != getStateField(genesisState[], genesis_validators_root): error "Checkpoint state does not match genesis", rootInCheckpoint = getStateField(state[], genesis_validators_root), rootInGenesis = getStateField(genesisState[], genesis_validators_root) quit 1 ChainDAGRef.preInit(db, genesisState[]) if getStateField(genesisState[], slot) != getStateField(state[], slot): ChainDAGRef.preInit(db, state[]) else: ChainDAGRef.preInit(db, state[]) if downloadDepositSnapshot: # Fetch deposit snapshot. This API endpoint is still optional. let depositSnapshot = await fetchDepositSnapshot(client) if depositSnapshot.isOk: if depositSnapshot.get.matches(getStateField(state[], eth1_data)): info "Writing deposit contracts snapshot", depositRoot = depositSnapshot.get.getDepositRoot(), depositCount = depositSnapshot.get.getDepositCountU64 db.putDepositTreeSnapshot(depositSnapshot.get) else: warn "The downloaded deposit snapshot does not agree with the downloaded state" else: warn "Deposit tree snapshot was not imported", reason = depositSnapshot.error else: notice "Skipping checkpoint download, database already exists (remove db directory to get a fresh snapshot)", databaseDir, head = shortLog(head.get()) # Coming this far, we've done what ChainDAGRef.preInit would normally do - # we can now load a ChainDAG to start backfilling it let validatorMonitor = newClone(ValidatorMonitor.init(false, false)) dag = ChainDAGRef.init(cfg, db, validatorMonitor, {}, eraPath = eraDir) backfillSlot = max(dag.backfill.slot, 1.Slot) - 1 horizon = max(dag.horizon, dag.frontfill.valueOr(BlockId()).slot) let canReindex = if backfillSlot <= horizon: info "Database backfilled", backfill = dag.backfill, horizon true elif backfill: # +1 because we need to download the frontfill slot for the frontfill match # detection to kick in, in addBackfillBlock let missingSlots = dag.backfill.slot - horizon + 1 notice "Downloading historical blocks - you can interrupt this process at any time and it will automatically be completed when you start the beacon node", backfillSlot, horizon, missingSlots var # Same averaging as SyncManager syncCount = 0 processed = 0'u64 avgSyncSpeed = 0.0 stamp = SyncMoment.now(0) proc downloadBlock(slot: Slot): Future[Option[ref ForkedSignedBeaconBlock]] {.async.} = # Download block at given slot, retrying a few times, var lastError: ref CatchableError for i in 0..<3: try: return awaitWithTimeout(client.getBlockV2(BlockIdent.init(slot), cfg), smallRequestsTimeout): raise newException(CatchableError, "Request timed out") except RestResponseError as exc: lastError = exc notice "Server does not support block downloads / backfilling - blocks will be downloaded later", msg = exc.msg break except CatchableError as exc: # We'll assume this may be a connectivity error or something similar lastError = exc warn "Retrying download of block", slot, err = exc.msg client = RestClientRef.new(restUrl).valueOr: error "Cannot connect to server", url = restUrl, error = error quit 1 raise lastError # Download several blocks in parallel but process them serially proc processBlock(blck: Option[ref ForkedSignedBeaconBlock]) = let newStamp = SyncMoment.now(processed) if newStamp.stamp - stamp.stamp > 12.seconds: syncCount += 1 let remaining = dag.backfill.slot - horizon slotsPerSec = speed(stamp, newStamp) avgSyncSpeed = avgSyncSpeed + (slotsPerSec - avgSyncSpeed) / float(syncCount) info "Backfilling", timeleft = toTimeLeftString( if avgSyncSpeed >= 0.001: Duration.fromFloatSeconds(remaining.float / avgSyncSpeed) else: InfiniteDuration), slotsPerSecond = avgSyncSpeed, remainingSlots = remaining stamp = newStamp processed += 1 if blck.isSome(): let data = blck.get() withBlck(data[]): let res = case syncTarget.kind of TrustedNodeSyncKind.TrustedBlockRoot: # Trust-minimized sync: the server is only trusted for # data availability, responses must be verified dag.addBackfillBlock(forkyBlck) of TrustedNodeSyncKind.StateId: # The server is fully trusted to provide accurate data; # it could have provided a malicious state dag.addBackfillBlock(forkyBlck.asSigVerified()) if res.isErr(): case res.error() of VerifierError.Invalid, VerifierError.MissingParent, VerifierError.UnviableFork: error "Got invalid block from trusted node - is it on the right network?", blck = shortLog(forkyBlck), err = res.error() quit 1 of VerifierError.Duplicate: discard # Download blocks backwards from the backfill slot, ie the first slot for # which we don't have a block, when walking backwards from the head try: var gets: array[16, Future[Option[ref ForkedSignedBeaconBlock]]] for i in 0.uint64..missingSlots + gets.lenu64: if i >= gets.lenu64(): let fut = gets[int(i mod gets.lenu64)] processBlock(await fut) if i <= backfillSlot: let slot = backfillSlot - i gets[int(i mod gets.lenu64)] = downloadBlock(slot) if i mod 1024 == 0: db.checkpoint() # Transfer stuff from wal periodically true except CatchableError as exc: # Block download failed notice "Backfilling incomplete - blocks will be downloaded when starting the node", msg = exc.msg false else: let missingSlots = dag.backfill.slot - horizon notice "Database initialized, historical blocks will be backfilled when starting the node", missingSlots, backfill = dag.backfill, horizon false if reindex and canReindex: notice "Reindexing historical state lookup tables (you can interrupt this process at any time)" # Build a DAG dag.rebuildIndex() notice "Done, your beacon node is ready to serve you! Don't forget to check that you're on the canonical chain by comparing the checkpoint root with other online sources. See https://nimbus.guide/trusted-node-sync.html for more information.", checkpoint = dag.head when isMainModule: import std/os, networking/network_metadata let cfg = getRuntimeConfig(some os.paramStr(1)) databaseDir = os.paramStr(2) syncTarget = TrustedNodeSyncTarget( kind: TrustedNodeSyncKind.StateId, stateId: os.paramStr(5)) backfill = os.paramCount() > 5 and os.paramStr(6) == "true" db = BeaconChainDB.new(databaseDir, cfg, inMemory = false) waitFor db.doTrustedNodeSync( cfg, databaseDir, os.paramStr(3), os.paramStr(4), syncTarget, backfill, false, true) db.close()