273 lines
9.9 KiB
Nim
273 lines
9.9 KiB
Nim
# Nimbus
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# Copyright (c) 2023-2024 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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# * MIT license ([LICENSE-MIT](LICENSE-MIT))
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# at your option.
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# This file may not be copied, modified, or distributed except according to
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# those terms.
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import
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std/[sequtils, tables],
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eth/common/[hashes, headers],
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chronicles,
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web3/execution_types,
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./web3_eth_conv,
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./payload_conv,
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./payload_queue,
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./api_handler/api_utils,
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../core/[tx_pool, casper, chain]
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export
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chain,
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ExecutionBundle
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type
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BeaconEngineRef* = ref object
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txPool: TxPoolRef
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queue : PayloadQueue
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chain : ForkedChainRef
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# The forkchoice update and new payload method require us to return the
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# latest valid hash in an invalid chain. To support that return, we need
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# to track historical bad blocks as well as bad tipsets in case a chain
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# is constantly built on it.
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#
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# There are a few important caveats in this mechanism:
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# - The bad block tracking is ephemeral, in-memory only. We must never
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# persist any bad block information to disk as a bug in Geth could end
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# up blocking a valid chain, even if a later Geth update would accept
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# it.
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# - Bad blocks will get forgotten after a certain threshold of import
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# attempts and will be retried. The rationale is that if the network
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# really-really-really tries to feed us a block, we should give it a
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# new chance, perhaps us being racey instead of the block being legit
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# bad (this happened in Geth at a point with import vs. pending race).
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# - Tracking all the blocks built on top of the bad one could be a bit
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# problematic, so we will only track the head chain segment of a bad
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# chain to allow discarding progressing bad chains and side chains,
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# without tracking too much bad data.
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# Ephemeral cache to track invalid blocks and their hit count
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invalidBlocksHits: Table[Hash32, int]
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# Ephemeral cache to track invalid tipsets and their bad ancestor
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invalidTipsets : Table[Hash32, Header]
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{.push gcsafe, raises:[].}
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const
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# invalidBlockHitEviction is the number of times an invalid block can be
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# referenced in forkchoice update or new payload before it is attempted
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# to be reprocessed again.
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invalidBlockHitEviction = 128
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# invalidTipsetsCap is the max number of recent block hashes tracked that
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# have lead to some bad ancestor block. It's just an OOM protection.
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invalidTipsetsCap = 512
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# ------------------------------------------------------------------------------
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# Private helpers
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# ------------------------------------------------------------------------------
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func setWithdrawals(ctx: CasperRef, attrs: PayloadAttributes) =
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case attrs.version
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of Version.V2, Version.V3:
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ctx.withdrawals = ethWithdrawals attrs.withdrawals.get
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else:
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ctx.withdrawals = @[]
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template wrapException(body: untyped): auto =
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try:
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body
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except CatchableError as ex:
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err(ex.msg)
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# setInvalidAncestor is a callback for the downloader to notify us if a bad block
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# is encountered during the async sync.
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func setInvalidAncestor(ben: BeaconEngineRef,
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invalid, origin: Header) =
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ben.invalidTipsets[origin.blockHash] = invalid
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inc ben.invalidBlocksHits.mgetOrPut(invalid.blockHash, 0)
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# ------------------------------------------------------------------------------
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# Constructors
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# ------------------------------------------------------------------------------
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func new*(_: type BeaconEngineRef,
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txPool: TxPoolRef,
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chain: ForkedChainRef): BeaconEngineRef =
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let ben = BeaconEngineRef(
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txPool: txPool,
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queue : PayloadQueue(),
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chain : chain,
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)
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txPool.com.notifyBadBlock = proc(invalid, origin: Header)
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{.gcsafe, raises: [].} =
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ben.setInvalidAncestor(invalid, origin)
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ben
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# ------------------------------------------------------------------------------
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# Public functions, setters
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# ------------------------------------------------------------------------------
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func put*(ben: BeaconEngineRef,
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hash: Hash32, header: Header) =
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ben.queue.put(hash, header)
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func put*(ben: BeaconEngineRef, id: Bytes8,
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payload: ExecutionBundle) =
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ben.queue.put(id, payload)
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# ------------------------------------------------------------------------------
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# Public functions, getters
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# ------------------------------------------------------------------------------
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func com*(ben: BeaconEngineRef): CommonRef =
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ben.txPool.com
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func chain*(ben: BeaconEngineRef): ForkedChainRef =
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ben.chain
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func get*(ben: BeaconEngineRef, hash: Hash32,
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header: var Header): bool =
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ben.queue.get(hash, header)
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func get*(ben: BeaconEngineRef, id: Bytes8,
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payload: var ExecutionBundle): bool =
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ben.queue.get(id, payload)
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc generateExecutionBundle*(ben: BeaconEngineRef,
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attrs: PayloadAttributes):
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Result[ExecutionBundle, string] =
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wrapException:
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let
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xp = ben.txPool
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pos = xp.com.pos
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headBlock = ben.chain.latestHeader
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pos.prevRandao = attrs.prevRandao
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pos.timestamp = ethTime attrs.timestamp
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pos.feeRecipient = attrs.suggestedFeeRecipient
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if attrs.parentBeaconBlockRoot.isSome:
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pos.parentBeaconBlockRoot = attrs.parentBeaconBlockRoot.get
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pos.setWithdrawals(attrs)
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if headBlock.blockHash != xp.head.blockHash:
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# reorg
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discard xp.smartHead(headBlock)
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if pos.timestamp <= headBlock.timestamp:
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return err "timestamp must be strictly later than parent"
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# someBaseFee = true: make sure bundle.blk.header
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# have the same blockHash with generated payload
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let bundle = xp.assembleBlock(someBaseFee = true).valueOr:
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return err(error)
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if bundle.blk.header.extraData.len > 32:
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return err "extraData length should not exceed 32 bytes"
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var blobsBundle: Opt[BlobsBundleV1]
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if bundle.blobsBundle.isSome:
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template blobData: untyped = bundle.blobsBundle.get
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blobsBundle = Opt.some BlobsBundleV1(
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commitments: blobData.commitments,
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proofs: blobData.proofs,
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blobs: blobData.blobs.mapIt it.Web3Blob)
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ok ExecutionBundle(
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payload: executionPayload(bundle.blk),
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blobsBundle: blobsBundle,
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blockValue: bundle.blockValue,
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executionRequests: bundle.executionRequests)
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func setInvalidAncestor*(ben: BeaconEngineRef, header: Header, blockHash: Hash32) =
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ben.invalidBlocksHits[blockHash] = 1
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ben.invalidTipsets[blockHash] = header
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# checkInvalidAncestor checks whether the specified chain end links to a known
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# bad ancestor. If yes, it constructs the payload failure response to return.
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proc checkInvalidAncestor*(ben: BeaconEngineRef,
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check, head: Hash32): Opt[PayloadStatusV1] =
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proc latestValidHash(chain: ForkedChainRef, invalid: auto): Hash32 =
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let parent = chain.headerByHash(invalid.parentHash).valueOr:
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return invalid.parentHash
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if parent.difficulty != 0.u256:
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return default(Hash32)
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invalid.parentHash
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# If the hash to check is unknown, return valid
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ben.invalidTipsets.withValue(check, invalid) do:
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# If the bad hash was hit too many times, evict it and try to reprocess in
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# the hopes that we have a data race that we can exit out of.
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let badHash = invalid[].blockHash
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inc ben.invalidBlocksHits.mgetOrPut(badHash, 0)
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if ben.invalidBlocksHits.getOrDefault(badHash) >= invalidBlockHitEviction:
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warn "Too many bad block import attempt, trying",
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number=invalid.number, hash=badHash.short
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ben.invalidBlocksHits.del(badHash)
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var deleted = newSeq[Hash32]()
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for descendant, badHeader in ben.invalidTipsets:
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if badHeader.blockHash == badHash:
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deleted.add descendant
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for x in deleted:
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ben.invalidTipsets.del(x)
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return Opt.none(PayloadStatusV1)
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# Not too many failures yet, mark the head of the invalid chain as invalid
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if check != head:
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warn "Marked new chain head as invalid",
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hash=head, badnumber=invalid.number, badhash=badHash
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if ben.invalidTipsets.len >= invalidTipsetsCap:
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let size = invalidTipsetsCap - ben.invalidTipsets.len
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var deleted = newSeqOfCap[Hash32](size)
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for key in ben.invalidTipsets.keys:
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deleted.add key
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if deleted.len >= size:
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break
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for x in deleted:
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ben.invalidTipsets.del(x)
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ben.invalidTipsets[head] = invalid[]
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# If the last valid hash is the terminal pow block, return 0x0 for latest valid hash
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let lastValid = latestValidHash(ben.chain, invalid)
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return Opt.some invalidStatus(lastValid, "links to previously rejected block")
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do:
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return Opt.none(PayloadStatusV1)
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# delayPayloadImport stashes the given block away for import at a later time,
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# either via a forkchoice update or a sync extension. This method is meant to
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# be called by the newpayload command when the block seems to be ok, but some
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# prerequisite prevents it from being processed (e.g. no parent, or snap sync).
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proc delayPayloadImport*(ben: BeaconEngineRef, header: Header): PayloadStatusV1 =
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# Sanity check that this block's parent is not on a previously invalidated
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# chain. If it is, mark the block as invalid too.
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let blockHash = header.blockHash
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let res = ben.checkInvalidAncestor(header.parentHash, blockHash)
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if res.isSome:
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return res.get
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# Stash the block away for a potential forced forkchoice update to it
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# at a later time.
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ben.put(blockHash, header)
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# Although we don't want to trigger a sync, if there is one already in
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# progress, try to extend it with the current payload request to relieve
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# some strain from the forkchoice update.
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ben.com.syncReqNewHead(header)
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PayloadStatusV1(status: PayloadExecutionStatus.syncing)
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