552 lines
21 KiB
Nim
552 lines
21 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2024 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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stew/base10,
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chronicles, chronos, eth/async_utils,
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./sync/[light_client_sync_helpers, sync_manager],
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./consensus_object_pools/[block_clearance, blockchain_dag],
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./spec/eth2_apis/rest_beacon_client,
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./spec/[beaconstate, eth2_merkleization, forks, light_client_sync,
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network, presets,
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state_transition, deposit_snapshots],
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"."/[beacon_clock, beacon_chain_db, era_db]
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from presto import RestDecodingError
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const
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largeRequestsTimeout = 90.seconds # Downloading large items such as states.
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smallRequestsTimeout = 30.seconds # Downloading smaller items such as blocks and deposit snapshots.
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proc fetchDepositSnapshot(
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client: RestClientRef
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): Future[Result[DepositContractSnapshot, string]] {.async.} =
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let resp = try:
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awaitWithTimeout(client.getDepositSnapshot(), smallRequestsTimeout):
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return err "Fetching /eth/v1/beacon/deposit_snapshot timed out"
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except CatchableError as e:
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return err("The trusted node likely does not support the /eth/v1/beacon/deposit_snapshot end-point:" & e.msg)
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let snapshot = DepositContractSnapshot.init(resp.data.data).valueOr:
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return err "The obtained deposit snapshot contains self-contradictory data"
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ok snapshot
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from ./spec/datatypes/deneb import asSigVerified, shortLog
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type
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TrustedNodeSyncKind* {.pure.} = enum
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TrustedBlockRoot,
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StateId
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TrustedNodeSyncTarget* = object
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case kind*: TrustedNodeSyncKind
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of TrustedNodeSyncKind.TrustedBlockRoot:
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trustedBlockRoot*: Eth2Digest
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of TrustedNodeSyncKind.StateId:
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stateId*: string
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func shortLog*(v: TrustedNodeSyncTarget): auto =
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case v.kind
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of TrustedNodeSyncKind.TrustedBlockRoot:
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"trustedBlockRoot(" & $v.trustedBlockRoot & ")"
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of TrustedNodeSyncKind.StateId:
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v.stateId
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chronicles.formatIt(TrustedNodeSyncTarget): shortLog(it)
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proc doTrustedNodeSync*(
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db: BeaconChainDB,
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cfg: RuntimeConfig,
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databaseDir: string,
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eraDir: string,
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restUrl: string,
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syncTarget: TrustedNodeSyncTarget,
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backfill: bool,
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reindex: bool,
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downloadDepositSnapshot: bool,
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genesisState: ref ForkedHashedBeaconState = nil) {.async.} =
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logScope:
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restUrl
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syncTarget
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notice "Starting trusted node sync",
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databaseDir, backfill, reindex
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var
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client = RestClientRef.new(restUrl).valueOr:
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error "Cannot connect to server", error = error
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quit 1
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# If possible, we'll store the genesis state in the database - this is not
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# strictly necessary but renders the resulting database compatible with
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# versions prior to 22.11 and makes reindexing possible
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let genesisState =
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if (let genesisRoot = db.getGenesisBlock(); genesisRoot.isSome()):
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let
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genesisBlock = db.getForkedBlock(genesisRoot.get()).valueOr:
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error "Cannot load genesis block from database",
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genesisRoot = genesisRoot.get()
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quit 1
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genesisStateRoot = getForkedBlockField(genesisBlock, state_root)
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consensusFork = cfg.consensusForkAtEpoch(GENESIS_EPOCH)
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tmp = (ref ForkedHashedBeaconState)(kind: consensusFork)
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if not db.getState(consensusFork, genesisStateRoot, tmp[], noRollback):
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error "Cannot load genesis state from database",
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genesisStateRoot
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quit 1
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if (genesisState != nil) and
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(getStateRoot(tmp[]) != getStateRoot(genesisState[])):
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error "Unexpected genesis state in database, is this the same network?",
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databaseRoot = getStateRoot(tmp[]),
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genesisRoot = getStateRoot(genesisState[])
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quit 1
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tmp
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else:
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let tmp = if genesisState != nil:
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genesisState
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else:
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case syncTarget.kind
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of TrustedNodeSyncKind.TrustedBlockRoot:
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error "Genesis state is required when using `trustedBlockRoot`",
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missingNetworkMetadataFile = "genesis.ssz"
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# `genesis_time` and `genesis_validators_root` are required to check
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# light client data signatures. They are not part of `config.yaml`.
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# We could download the initial state based on `LightClientBootstrap`
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# `state_root`, but that state is unlikely to be readily available and
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# can be much larger than the genesis state. Furthermore, the major
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# known networks bundle the `genesis.ssz` file with network metadata,
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# so adding this complexity doesn't solve a practical usecase. Users
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# on private networks may obtain a trusted `genesis.ssz` file and mark
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# it as trusted by moving it into the network metadata folder.
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#
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# Note that `historical_roots` / `historical_summaries` may be used to
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# prove correctness of a particular genesis state. However, there is
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# currently no endpoint to obtain proofs, and they change for every
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# slot, making it tricky to actually provide them.
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quit 1
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of TrustedNodeSyncKind.StateId:
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notice "Downloading genesis state", restUrl
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try:
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awaitWithTimeout(
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client.getStateV2(StateIdent.init(StateIdentType.Genesis), cfg),
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largeRequestsTimeout):
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info "Attempt to download genesis state timed out"
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# https://github.com/nim-lang/Nim/issues/22180
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(ref ForkedHashedBeaconState)(nil)
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except CatchableError as exc:
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info "Unable to download genesis state",
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error = exc.msg, restUrl
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nil
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if isNil(tmp):
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notice "Server is missing genesis state, node will not be able to reindex history",
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restUrl
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tmp
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let
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dbHead = db.getHeadBlock()
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head = if dbHead.isSome():
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let
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bid = db.getBlockId(dbHead.get()).valueOr:
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error "Database missing head block summary - database too old or corrupt",
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headRoot = dbHead.get()
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quit 1
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Opt.some bid
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else:
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# When we don't have a head, we'll use the given checkpoint as head
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Opt.none(BlockId)
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if head.isNone:
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var stateRoot: Opt[Eth2Digest]
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let stateId =
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case syncTarget.kind
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of TrustedNodeSyncKind.TrustedBlockRoot:
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# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.4/specs/altair/light-client/light-client.md#light-client-sync-process
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const lcDataFork = LightClientDataFork.high
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var bestViableCheckpoint: Opt[tuple[slot: Slot, state_root: Eth2Digest]]
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func trackBestViableCheckpoint(store: lcDataFork.LightClientStore) =
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if store.finalized_header.beacon.slot.is_epoch:
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bestViableCheckpoint.ok((
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slot: store.finalized_header.beacon.slot,
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state_root: store.finalized_header.beacon.state_root))
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doAssert genesisState != nil, "Already checked for `TrustedBlockRoot`"
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let
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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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trustedBlockRoot = syncTarget.trustedBlockRoot
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var bootstrap =
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try:
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notice "Downloading LC bootstrap", trustedBlockRoot
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awaitWithTimeout(
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client.getLightClientBootstrap(
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trustedBlockRoot, cfg, forkDigests),
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smallRequestsTimeout
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):
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error "Attempt to download LC bootstrap timed out"
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quit 1
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except CatchableError as exc:
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error "Unable to download LC bootstrap", error = exc.msg
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quit 1
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if bootstrap.kind == LightClientDataFork.None:
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error "LC bootstrap unavailable on server"
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quit 1
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bootstrap.migrateToDataFork(lcDataFork)
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var storeRes = initialize_light_client_store(
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trustedBlockRoot, bootstrap.forky(lcDataFork), cfg)
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if storeRes.isErr:
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error "`initialize_light_client_store` failed", err = storeRes.error
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quit 1
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template store: auto = storeRes.get
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store.trackBestViableCheckpoint()
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while true:
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let
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finalized =
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store.finalized_header.beacon.slot.sync_committee_period
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optimistic =
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store.optimistic_header.beacon.slot.sync_committee_period
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current =
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getBeaconTime().slotOrZero().sync_committee_period
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isNextSyncCommitteeKnown =
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store.is_next_sync_committee_known
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let
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periods: Slice[SyncCommitteePeriod] =
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if finalized == optimistic and not isNextSyncCommitteeKnown:
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if finalized >= current:
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finalized .. finalized
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else:
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finalized ..< current
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elif finalized + 1 < current:
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finalized + 1 ..< current
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else:
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break
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startPeriod = periods.a
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count = min(periods.len, MAX_REQUEST_LIGHT_CLIENT_UPDATES).uint64
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var updates =
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try:
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notice "Downloading LC updates", startPeriod, count
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awaitWithTimeout(
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client.getLightClientUpdatesByRange(
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startPeriod, count, cfg, forkDigests),
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smallRequestsTimeout
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):
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error "Attempt to download LC updates timed out"
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quit 1
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except CatchableError as exc:
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error "Unable to download LC updates", error = exc.msg
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quit 1
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let e = updates.checkLightClientUpdates(startPeriod, count)
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if e.isErr:
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error "Malformed LC updates response", resError = e.error
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quit 1
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if updates.len == 0:
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warn "Server does not appear to be fully synced"
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break
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for i in 0 ..< updates.len:
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doAssert updates[i].kind > LightClientDataFork.None
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updates[i].migrateToDataFork(lcDataFork)
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let res = process_light_client_update(
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store, updates[i].forky(lcDataFork),
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getBeaconTime().slotOrZero(), cfg, genesis_validators_root)
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if not res.isOk:
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error "`process_light_client_update` failed", resError = res.error
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quit 1
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store.trackBestViableCheckpoint()
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var finalityUpdate =
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try:
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notice "Downloading LC finality update"
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awaitWithTimeout(
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client.getLightClientFinalityUpdate(cfg, forkDigests),
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smallRequestsTimeout
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):
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error "Attempt to download LC finality update timed out"
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quit 1
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except CatchableError as exc:
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error "Unable to download LC finality update", error = exc.msg
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quit 1
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if bootstrap.kind == LightClientDataFork.None:
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error "LC finality update unavailable on server"
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quit 1
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finalityUpdate.migrateToDataFork(lcDataFork)
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let res = process_light_client_update(
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store, finalityUpdate.forky(lcDataFork),
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getBeaconTime().slotOrZero(), cfg, genesis_validators_root)
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if not res.isOk:
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error "`process_light_client_update` failed", resError = res.error
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quit 1
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store.trackBestViableCheckpoint()
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if bestViableCheckpoint.isErr:
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error "CP not on epoch boundary. Retry later",
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latestCheckpointSlot = store.finalized_header.beacon.slot
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quit 1
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if not store.finalized_header.beacon.slot.is_epoch:
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warn "CP not on epoch boundary. Using older one",
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latestCheckpointSlot = store.finalized_header.beacon.slot,
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bestViableCheckpointSlot = bestViableCheckpoint.get.slot
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stateRoot.ok bestViableCheckpoint.get.state_root
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Base10.toString(distinctBase(bestViableCheckpoint.get.slot))
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of TrustedNodeSyncKind.StateId:
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syncTarget.stateId
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logScope: stateId
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notice "Downloading checkpoint state"
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let
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state = try:
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let id = block:
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let tmp = StateIdent.decodeString(stateId).valueOr:
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error "Cannot decode checkpoint state id, must be a slot, hash, 'finalized' or 'head'"
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quit 1
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if tmp.kind == StateQueryKind.Slot and not tmp.slot.is_epoch():
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notice "Rounding given slot to epoch"
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StateIdent.init(tmp.slot.epoch().start_slot)
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else:
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tmp
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awaitWithTimeout(client.getStateV2(id, cfg), largeRequestsTimeout):
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error "Attempt to download checkpoint state timed out"
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quit 1
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except CatchableError as exc:
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error "Unable to download checkpoint state",
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error = exc.msg
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quit 1
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if state == nil:
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error "No state found a given checkpoint"
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quit 1
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if stateRoot.isSome:
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if state[].getStateRoot() != stateRoot.get:
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error "Checkpoint state has incorrect root!",
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expectedStateRoot = stateRoot.get,
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actualStateRoot = state[].getStateRoot()
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quit 1
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info "Checkpoint state validated against LC data",
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stateRoot = stateRoot.get
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if not getStateField(state[], slot).is_epoch():
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error "State slot must fall on an epoch boundary",
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slot = getStateField(state[], slot),
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offset = getStateField(state[], slot) -
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getStateField(state[], slot).epoch.start_slot
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quit 1
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if genesisState != nil:
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if getStateField(state[], genesis_time) !=
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getStateField(genesisState[], genesis_time):
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error "Checkpoint state does not match genesis",
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timeInCheckpoint = getStateField(state[], genesis_time),
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timeInGenesis = getStateField(genesisState[], genesis_time)
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quit 1
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if getStateField(state[], genesis_validators_root) !=
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getStateField(genesisState[], genesis_validators_root):
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error "Checkpoint state does not match genesis",
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rootInCheckpoint = getStateField(state[], genesis_validators_root),
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rootInGenesis = getStateField(genesisState[], genesis_validators_root)
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quit 1
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ChainDAGRef.preInit(db, genesisState[])
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if getStateField(genesisState[], slot) != getStateField(state[], slot):
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ChainDAGRef.preInit(db, state[])
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else:
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ChainDAGRef.preInit(db, state[])
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if downloadDepositSnapshot:
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# Fetch deposit snapshot. This API endpoint is still optional.
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let depositSnapshot = await fetchDepositSnapshot(client)
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if depositSnapshot.isOk:
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if depositSnapshot.get.matches(getStateField(state[], eth1_data)):
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info "Writing deposit contracts snapshot",
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depositRoot = depositSnapshot.get.getDepositRoot(),
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depositCount = depositSnapshot.get.getDepositCountU64
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db.putDepositContractSnapshot(depositSnapshot.get)
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else:
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warn "The downloaded deposit snapshot does not agree with the downloaded state"
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else:
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warn "Deposit tree snapshot was not imported", reason = depositSnapshot.error
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else:
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notice "Skipping checkpoint download, database already exists (remove db directory to get a fresh snapshot)",
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databaseDir, head = shortLog(head.get())
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# Coming this far, we've done what ChainDAGRef.preInit would normally do -
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# we can now load a ChainDAG to start backfilling it
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let
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validatorMonitor = newClone(ValidatorMonitor.init(false, false))
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dag = ChainDAGRef.init(cfg, db, validatorMonitor, {}, eraPath = eraDir)
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backfillSlot = max(dag.backfill.slot, 1.Slot) - 1
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horizon = max(dag.horizon, dag.frontfill.valueOr(BlockId()).slot)
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let canReindex = if backfillSlot <= horizon:
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info "Database backfilled", backfill = dag.backfill, horizon
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true
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elif backfill:
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# +1 because we need to download the frontfill slot for the frontfill match
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# detection to kick in, in addBackfillBlock
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let missingSlots = dag.backfill.slot - horizon + 1
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notice "Downloading historical blocks - you can interrupt this process at any time and it will automatically be completed when you start the beacon node",
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backfillSlot, horizon, missingSlots
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var # Same averaging as SyncManager
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syncCount = 0
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processed = 0'u64
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avgSyncSpeed = 0.0
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stamp = SyncMoment.now(0)
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proc downloadBlock(slot: Slot):
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Future[Option[ref ForkedSignedBeaconBlock]] {.async.} =
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# Download block at given slot, retrying a few times,
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var lastError: ref CatchableError
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for i in 0..<3:
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try:
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return awaitWithTimeout(client.getBlockV2(BlockIdent.init(slot), cfg),
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smallRequestsTimeout):
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raise newException(CatchableError, "Request timed out")
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except RestResponseError as exc:
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lastError = exc
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notice "Server does not support block downloads / backfilling - blocks will be downloaded later",
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msg = exc.msg
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break
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except CatchableError as exc:
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# We'll assume this may be a connectivity error or something similar
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lastError = exc
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warn "Retrying download of block", slot, err = exc.msg
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client = RestClientRef.new(restUrl).valueOr:
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error "Cannot connect to server", url = restUrl, error = error
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quit 1
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raise lastError
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# Download several blocks in parallel but process them serially
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proc processBlock(blck: Option[ref ForkedSignedBeaconBlock]) =
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let newStamp = SyncMoment.now(processed)
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if newStamp.stamp - stamp.stamp > 12.seconds:
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syncCount += 1
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let
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remaining = dag.backfill.slot - horizon
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slotsPerSec = speed(stamp, newStamp)
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avgSyncSpeed = avgSyncSpeed + (slotsPerSec - avgSyncSpeed) / float(syncCount)
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info "Backfilling",
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timeleft = toTimeLeftString(
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if avgSyncSpeed >= 0.001:
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Duration.fromFloatSeconds(remaining.float / avgSyncSpeed)
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else: InfiniteDuration),
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slotsPerSecond = avgSyncSpeed,
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remainingSlots = remaining
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stamp = newStamp
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processed += 1
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if blck.isSome():
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let
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data = blck.get()
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withBlck(data[]):
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let res =
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case syncTarget.kind
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of TrustedNodeSyncKind.TrustedBlockRoot:
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# Trust-minimized sync: the server is only trusted for
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# data availability, responses must be verified
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dag.addBackfillBlock(forkyBlck)
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of TrustedNodeSyncKind.StateId:
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# The server is fully trusted to provide accurate data;
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# it could have provided a malicious state
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dag.addBackfillBlock(forkyBlck.asSigVerified())
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if res.isErr():
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case res.error()
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of VerifierError.Invalid,
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VerifierError.MissingParent,
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|
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()
|