nimbus-eth1/fluffy/tools/beacon_lc_bridge/beacon_lc_bridge.nim

808 lines
30 KiB
Nim

# Nimbus
# Copyright (c) 2023-2024 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.
#
# This beacon_lc_bridge allows for following the head of the beacon chain and
# seeding the latest execution block headers and bodies into the Portal network.
#
# The bridge does consensus light client sync and follows beacon block gossip.
# Once it is synced, the execution payload of new beacon blocks will be
# extracted and injected in the Portal network as execution headers and blocks.
#
# The injection into the Portal network is done via the `portal_historyGossip`
# JSON-RPC endpoint of a running Fluffy node.
#
# If a web3 provider is configured, then block receipts will also be injected
# into the network whenever there is a new block. The web3 provider is needed
# to request the receipts. The receipts root is verified against the root
# provided bij the exection payload of the beacon block.
# To get the block receipts, the web3 provider currently needs to support the
# `eth_getBlockReceipts` JSON-RPC endpoint (not in standard specification).
#
# Other, currently not implemented, options to seed data:
# - Backfill post-merge block headers & bodies block into the network. Could
# walk down the parent blocks and seed them. Could also verify if the data is
# already available on the network before seeding it, potentially jumping in
# steps > 1.
# - For backfill of pre-merge headers and blocks, access to epoch accumulators
# is needed to be able to build the proofs. These could be retrieved from the
# network, but would require usage of the `portal_historyRecursiveFindContent`
# JSON-RPC endpoint. Additionally, the actualy block headers and bodies need
# to be requested from an execution JSON-RPC endpoint.
# Data would flow from:
# (block data) execution client -> bridge
# (epoch accumulator) fluffy -> bridge
# (portal content) bridge -> fluffy
# This seems awfully cumbersome. Other options sound better, see comment down.
#
# Data seeding of Epoch accumulators is unlikely to be supported by this bridge.
# It is currently done by first downloading and storing all headers into files
# per epoch. Then the accumulator and epoch accumulators can be build from this
# data.
# The reason for this approach is because downloading all the headers from an
# execution endpoint takes long (you actually request the full blocks). An
# intermediate local storage step is preferred because of this. The accumulator
# build itself can be done in minutes when the data is locally available. These
# locally stored accumulators can then be seeded directly from a Fluffy node via
# a (currently) non standardized JSON-RPC endpoint.
#
# Data seeding of the block headers, bodies and receipts can be done the same
# way. Downloading and storing them first locally in files. Then seeding them
# into the network.
# For the headers, the proof needs to be build and added from the right
# epoch accumulator, so access to the epoch accumulator is a requirement
# (offline or from the network).
# This functionality is currently directly part of Fluffy and triggered via
# non standardized JSON-RPC calls
# Alternatively, this could also be moved to a seperate tool which gossips the
# data with a portal_historyGossip JSON-RPC call, but the building of the header
# proofs would be slighty more cumbersome.
#
{.push raises: [].}
import
std/[os, strutils, options],
chronicles, chronos, confutils,
eth/[keys, rlp],
# Need to rename this because of web3 ethtypes and ambigious indentifier mess
# for `BlockHeader`.
eth/common/eth_types as etypes,
eth/common/eth_types_rlp,
beacon_chain/el/el_manager,
beacon_chain/gossip_processing/optimistic_processor,
beacon_chain/networking/topic_params,
beacon_chain/spec/beaconstate,
beacon_chain/spec/datatypes/[phase0, altair, bellatrix],
beacon_chain/[light_client, nimbus_binary_common],
# Weirdness. Need to import this to be able to do errors.ValidationResult as
# else we get an ambiguous identifier, ValidationResult from eth & libp2p.
libp2p/protocols/pubsub/errors,
../../../nimbus/rpc/rpc_types,
../../rpc/[portal_rpc_client, eth_rpc_client],
../../network/history/[history_content, history_network],
../../network/beacon/beacon_content,
../../common/common_types,
../../nimbus/db/core_db,
./beacon_lc_bridge_conf
from stew/objects import checkedEnumAssign
from stew/byteutils import readHexChar
from web3/primitives as web3types import BlockHash
from beacon_chain/gossip_processing/block_processor import newExecutionPayload
from beacon_chain/gossip_processing/eth2_processor import toValidationResult
type Hash256 = etypes.Hash256
template asEthHash(hash: web3types.BlockHash): Hash256 =
Hash256(data: distinctBase(hash))
# TODO: Ugh why isn't gasLimit and gasUsed a uint64 in nim-eth / nimbus-eth1 :(
template unsafeQuantityToInt64(q: Quantity): int64 =
int64 q
# TODO: Cannot use the `hexToInt` from rpc_utils as it importing that causes a
# strange "Exception can raise an unlisted exception: Exception` compile error.
func hexToInt(
s: string, T: typedesc[SomeInteger]): T {.raises: [ValueError].} =
var i = 0
if s[i] == '0' and (s[i+1] in {'x', 'X'}):
inc(i, 2)
if s.len - i > sizeof(T) * 2:
raise newException(ValueError, "Input hex too big for destination int")
var res: T = 0
while i < s.len:
res = res shl 4 or readHexChar(s[i]).T
inc(i)
res
func asTxType(quantity: Option[Quantity]): Result[TxType, string] =
let value = quantity.get(0.Quantity).uint8
var txType: TxType
if not checkedEnumAssign(txType, value):
err("Invalid data for TxType: " & $value)
else:
ok(txType)
func asReceipt(
receiptObject: rpc_types.ReceiptObject): Result[Receipt, string] =
let receiptType = asTxType(receiptObject.`type`).valueOr:
return err("Failed conversion to TxType" & error)
var logs: seq[Log]
if receiptObject.logs.len > 0:
for log in receiptObject.logs:
var topics: seq[eth_types.Topic]
for topic in log.topics:
topics.add(eth_types.Topic(topic))
logs.add(Log(
address: ethAddr log.address,
data: log.data,
topics: topics
))
let cumulativeGasUsed = receiptObject.cumulativeGasUsed.GasInt
if receiptObject.status.isSome():
let status = receiptObject.status.get().int
ok(Receipt(
receiptType: receiptType,
isHash: false,
status: status == 1,
cumulativeGasUsed: cumulativeGasUsed,
bloom: BloomFilter(receiptObject.logsBloom),
logs: logs
))
elif receiptObject.root.isSome():
ok(Receipt(
receiptType: receiptType,
isHash: true,
hash: ethHash receiptObject.root.get(),
cumulativeGasUsed: cumulativeGasUsed,
bloom: BloomFilter(receiptObject.logsBloom),
logs: logs
))
else:
err("No root nor status field in the JSON receipt object")
proc calculateTransactionData(
items: openArray[TypedTransaction]):
Hash256 {.raises: [].} =
var tr = newCoreDbRef(LegacyDbMemory).mptPrune
for i, t in items:
try:
let tx = distinctBase(t)
tr.put(rlp.encode(i), tx)
except CatchableError as e:
# tr.put interface can raise exception
raiseAssert(e.msg)
return tr.rootHash()
# TODO: Since Capella we can also access ExecutionPayloadHeader and thus
# could get the Roots through there instead.
proc calculateWithdrawalsRoot(
items: openArray[WithdrawalV1]):
Hash256 {.raises: [].} =
var tr = newCoreDbRef(LegacyDbMemory).mptPrune
for i, w in items:
try:
let withdrawal = etypes.Withdrawal(
index: distinctBase(w.index),
validatorIndex: distinctBase(w.validatorIndex),
address: distinctBase(w.address),
amount: distinctBase(w.amount)
)
tr.put(rlp.encode(i), rlp.encode(withdrawal))
except CatchableError as e:
raiseAssert(e.msg)
return tr.rootHash()
proc asPortalBlockData*(
payload: ExecutionPayloadV1):
(common_types.BlockHash, BlockHeaderWithProof, PortalBlockBodyLegacy) =
let
txRoot = calculateTransactionData(payload.transactions)
withdrawalsRoot = options.none(Hash256)
header = etypes.BlockHeader(
parentHash: payload.parentHash.asEthHash,
ommersHash: EMPTY_UNCLE_HASH,
coinbase: EthAddress payload.feeRecipient,
stateRoot: payload.stateRoot.asEthHash,
txRoot: txRoot,
receiptRoot: payload.receiptsRoot.asEthHash,
bloom: distinctBase(payload.logsBloom),
difficulty: default(DifficultyInt),
blockNumber: payload.blockNumber.distinctBase.u256,
gasLimit: payload.gasLimit.unsafeQuantityToInt64,
gasUsed: payload.gasUsed.unsafeQuantityToInt64,
timestamp: payload.timestamp.EthTime,
extraData: bytes payload.extraData,
mixDigest: payload.prevRandao.asEthHash,
nonce: default(BlockNonce),
fee: some(payload.baseFeePerGas),
withdrawalsRoot: withdrawalsRoot,
blobGasUsed: options.none(uint64),
excessBlobGas: options.none(uint64)
)
headerWithProof = BlockHeaderWithProof(
header: ByteList(rlp.encode(header)),
proof: BlockHeaderProof.init())
var transactions: Transactions
for tx in payload.transactions:
discard transactions.add(TransactionByteList(distinctBase(tx)))
let body = PortalBlockBodyLegacy(
transactions: transactions,
uncles: Uncles(@[byte 0xc0]))
let hash = common_types.BlockHash(data: distinctBase(payload.blockHash))
(hash, headerWithProof, body)
proc asPortalBlockData*(
payload: ExecutionPayloadV2 | ExecutionPayloadV3):
(common_types.BlockHash, BlockHeaderWithProof, PortalBlockBodyShanghai) =
let
txRoot = calculateTransactionData(payload.transactions)
withdrawalsRoot = some(calculateWithdrawalsRoot(payload.withdrawals))
header = etypes.BlockHeader(
parentHash: payload.parentHash.asEthHash,
ommersHash: EMPTY_UNCLE_HASH,
coinbase: EthAddress payload.feeRecipient,
stateRoot: payload.stateRoot.asEthHash,
txRoot: txRoot,
receiptRoot: payload.receiptsRoot.asEthHash,
bloom: distinctBase(payload.logsBloom),
difficulty: default(DifficultyInt),
blockNumber: payload.blockNumber.distinctBase.u256,
gasLimit: payload.gasLimit.unsafeQuantityToInt64,
gasUsed: payload.gasUsed.unsafeQuantityToInt64,
timestamp: payload.timestamp.EthTime,
extraData: bytes payload.extraData,
mixDigest: payload.prevRandao.asEthHash,
nonce: default(BlockNonce),
fee: some(payload.baseFeePerGas),
withdrawalsRoot: withdrawalsRoot,
blobGasUsed: options.none(uint64),
excessBlobGas: options.none(uint64) # TODO: adjust later according to deneb fork
)
headerWithProof = BlockHeaderWithProof(
header: ByteList(rlp.encode(header)),
proof: BlockHeaderProof.init())
var transactions: Transactions
for tx in payload.transactions:
discard transactions.add(TransactionByteList(distinctBase(tx)))
func toWithdrawal(x: WithdrawalV1): Withdrawal =
Withdrawal(
index: x.index.uint64,
validatorIndex: x.validatorIndex.uint64,
address: x.address.EthAddress,
amount: x.amount.uint64
)
var withdrawals: Withdrawals
for w in payload.withdrawals:
discard withdrawals.add(WithdrawalByteList(rlp.encode(toWithdrawal(w))))
let body = PortalBlockBodyShanghai(
transactions: transactions,
uncles: Uncles(@[byte 0xc0]),
withdrawals: withdrawals
)
let hash = common_types.BlockHash(data: distinctBase(payload.blockHash))
(hash, headerWithProof, body)
proc getBlockReceipts(
client: RpcClient, transactions: seq[TypedTransaction], blockHash: Hash256):
Future[Result[seq[Receipt], string]] {.async.} =
## Note: This makes use of `eth_getBlockReceipts` JSON-RPC endpoint which is
## only supported by Alchemy.
var receipts: seq[Receipt]
if transactions.len() > 0:
let receiptObjects =
# TODO: Add some retries depending on the failure
try:
await client.eth_getBlockReceipts(w3Hash blockHash)
except CatchableError as e:
await client.close()
return err("JSON-RPC eth_getBlockReceipts failed: " & e.msg)
await client.close()
for receiptObject in receiptObjects:
let receipt = asReceipt(receiptObject).valueOr:
return err(error)
receipts.add(receipt)
return ok(receipts)
# TODO: This requires a seperate call for each transactions, which in reality
# takes too long and causes too much overhead. To make this usable the JSON-RPC
# code needs to get support for batch requests.
proc getBlockReceipts(
client: RpcClient, transactions: seq[TypedTransaction]):
Future[Result[seq[Receipt], string]] {.async.} =
var receipts: seq[Receipt]
for tx in transactions:
let txHash = keccakHash(tx.distinctBase)
let receiptObjectOpt =
# TODO: Add some retries depending on the failure
try:
await client.eth_getTransactionReceipt(w3Hash txHash)
except CatchableError as e:
await client.close()
return err("JSON-RPC eth_getTransactionReceipt failed: " & e.msg)
await client.close()
if receiptObjectOpt.isNone():
return err("eth_getTransactionReceipt returned no receipt")
let receipt = asReceipt(receiptObjectOpt.get()).valueOr:
return err(error)
receipts.add(receipt)
return ok(receipts)
proc run(config: BeaconBridgeConf) {.raises: [CatchableError].} =
# Required as both Eth2Node and LightClient requires correct config type
var lcConfig = config.asLightClientConf()
setupLogging(config.logLevel, config.logStdout, none(OutFile))
notice "Launching fluffy beacon chain light bridge",
cmdParams = commandLineParams(), config
let metadata = loadEth2Network(config.eth2Network)
for node in metadata.bootstrapNodes:
lcConfig.bootstrapNodes.add node
template cfg(): auto = metadata.cfg
let
genesisState =
try:
template genesisData(): auto = metadata.genesis.bakedBytes
newClone(readSszForkedHashedBeaconState(
cfg, genesisData.toOpenArray(genesisData.low, genesisData.high)))
except CatchableError as err:
raiseAssert "Invalid baked-in state: " & err.msg
genesisTime = getStateField(genesisState[], genesis_time)
beaconClock = BeaconClock.init(genesisTime).valueOr:
error "Invalid genesis time in state", genesisTime
quit QuitFailure
getBeaconTime = beaconClock.getBeaconTimeFn()
genesis_validators_root =
getStateField(genesisState[], genesis_validators_root)
forkDigests = newClone ForkDigests.init(cfg, genesis_validators_root)
genesisBlockRoot = get_initial_beacon_block(genesisState[]).root
rng = keys.newRng()
netKeys = getRandomNetKeys(rng[])
network = createEth2Node(
rng, lcConfig, netKeys, cfg,
forkDigests, getBeaconTime, genesis_validators_root
)
portalRpcClient = newRpcHttpClient()
web3Client: Opt[RpcClient] =
if config.web3Url.isNone():
Opt.none(RpcClient)
else:
let client: RpcClient =
case config.web3Url.get().kind
of HttpUrl:
newRpcHttpClient()
of WsUrl:
newRpcWebSocketClient()
Opt.some(client)
optimisticHandler = proc(signedBlock: ForkedMsgTrustedSignedBeaconBlock):
Future[void] {.async.} =
# TODO: Should not be gossiping optimistic blocks, but instead store them
# in a cache and only gossip them after they are confirmed due to an LC
# finalized header.
notice "New LC optimistic block",
opt = signedBlock.toBlockId(),
wallSlot = getBeaconTime().slotOrZero
withBlck(signedBlock):
when consensusFork >= ConsensusFork.Bellatrix:
if forkyBlck.message.is_execution_block:
template payload(): auto = forkyBlck.message.body.execution_payload
# TODO: Get rid of the asEngineExecutionPayload step?
let executionPayload = payload.asEngineExecutionPayload()
let (hash, headerWithProof, body) =
asPortalBlockData(executionPayload)
logScope:
blockhash = history_content.`$`hash
block: # gossip header
let contentKey = history_content.ContentKey.init(blockHeader, hash)
let encodedContentKey = contentKey.encode.asSeq()
try:
let peers = await portalRpcClient.portal_historyGossip(
toHex(encodedContentKey),
SSZ.encode(headerWithProof).toHex())
info "Block header gossiped", peers,
contentKey = encodedContentKey.toHex()
except CatchableError as e:
error "JSON-RPC error", error = $e.msg
await portalRpcClient.close()
# For bodies to get verified, the header needs to be available on
# the network. Wait a little to get the headers propagated through
# the network.
await sleepAsync(2.seconds)
block: # gossip block
let contentKey = history_content.ContentKey.init(blockBody, hash)
let encodedContentKey = contentKey.encode.asSeq()
try:
let peers = await portalRpcClient.portal_historyGossip(
encodedContentKey.toHex(),
SSZ.encode(body).toHex())
info "Block body gossiped", peers,
contentKey = encodedContentKey.toHex()
except CatchableError as e:
error "JSON-RPC error", error = $e.msg
await portalRpcClient.close()
if web3Client.isSome():
# get receipts
let receipts =
(await web3Client.get().getBlockReceipts(
executionPayload.transactions, hash)).valueOr:
# (await web3Client.get().getBlockReceipts(
# executionPayload.transactions)).valueOr:
error "Error getting block receipts", error
return
let portalReceipts = PortalReceipts.fromReceipts(receipts)
if validateReceipts(portalReceipts, payload.receiptsRoot).isErr():
error "Receipts root is invalid"
return
# gossip receipts
let contentKey = history_content.ContentKey.init(
history_content.ContentType.receipts, hash)
let encodedContentKeyHex = contentKey.encode.asSeq().toHex()
try:
let peers = await portalRpcClient.portal_historyGossip(
encodedContentKeyHex,
SSZ.encode(portalReceipts).toHex())
info "Block receipts gossiped", peers,
contentKey = encodedContentKeyHex
except CatchableError as e:
error "JSON-RPC error for portal_historyGossip", error = $e.msg
await portalRpcClient.close()
return
optimisticProcessor = initOptimisticProcessor(
getBeaconTime, optimisticHandler)
lightClient = createLightClient(
network, rng, lcConfig, cfg, forkDigests, getBeaconTime,
genesis_validators_root, LightClientFinalizationMode.Optimistic)
### Beacon Light Client content bridging specific callbacks
proc onBootstrap(
lightClient: LightClient,
bootstrap: ForkedLightClientBootstrap) =
withForkyObject(bootstrap):
when lcDataFork > LightClientDataFork.None:
info "New Beacon LC bootstrap",
forkyObject, slot = forkyObject.header.beacon.slot
let
root = hash_tree_root(forkyObject.header)
contentKey = encode(bootstrapContentKey(root))
contentId = beacon_content.toContentId(contentKey)
forkDigest = forkDigestAtEpoch(
forkDigests[], epoch(forkyObject.header.beacon.slot), cfg)
content = encodeBootstrapForked(
forkDigest,
bootstrap
)
proc GossipRpcAndClose() {.async.} =
try:
let
contentKeyHex = contentKey.asSeq().toHex()
peers = await portalRpcClient.portal_beaconGossip(
contentKeyHex,
content.toHex())
info "Beacon LC bootstrap gossiped", peers,
contentKey = contentKeyHex
except CatchableError as e:
error "JSON-RPC error", error = $e.msg
await portalRpcClient.close()
asyncSpawn(GossipRpcAndClose())
proc onUpdate(lightClient: LightClient, update: ForkedLightClientUpdate) =
withForkyObject(update):
when lcDataFork > LightClientDataFork.None:
info "New Beacon LC update",
update, slot = forkyObject.attested_header.beacon.slot
let
period = forkyObject.attested_header.beacon.slot.sync_committee_period
contentKey = encode(updateContentKey(period.uint64, uint64(1)))
contentId = beacon_content.toContentId(contentKey)
forkDigest = forkDigestAtEpoch(
forkDigests[], epoch(forkyObject.attested_header.beacon.slot), cfg)
content = encodeLightClientUpdatesForked(
forkDigest,
@[update]
)
proc GossipRpcAndClose() {.async.} =
try:
let
contentKeyHex = contentKey.asSeq().toHex()
peers = await portalRpcClient.portal_beaconGossip(
contentKeyHex,
content.toHex())
info "Beacon LC bootstrap gossiped", peers,
contentKey = contentKeyHex
except CatchableError as e:
error "JSON-RPC error", error = $e.msg
await portalRpcClient.close()
asyncSpawn(GossipRpcAndClose())
proc onOptimisticUpdate(
lightClient: LightClient,
update: ForkedLightClientOptimisticUpdate) =
withForkyObject(update):
when lcDataFork > LightClientDataFork.None:
info "New Beacon LC optimistic update",
update, slot = forkyObject.attested_header.beacon.slot
let
slot = forkyObject.signature_slot
contentKey = encode(optimisticUpdateContentKey(slot.uint64))
contentId = beacon_content.toContentId(contentKey)
forkDigest = forkDigestAtEpoch(
forkDigests[], epoch(forkyObject.attested_header.beacon.slot), cfg)
content = encodeOptimisticUpdateForked(
forkDigest,
update
)
proc GossipRpcAndClose() {.async.} =
try:
let
contentKeyHex = contentKey.asSeq().toHex()
peers = await portalRpcClient.portal_beaconGossip(
contentKeyHex,
content.toHex())
info "Beacon LC bootstrap gossiped", peers,
contentKey = contentKeyHex
except CatchableError as e:
error "JSON-RPC error", error = $e.msg
await portalRpcClient.close()
asyncSpawn(GossipRpcAndClose())
proc onFinalityUpdate(
lightClient: LightClient,
update: ForkedLightClientFinalityUpdate) =
withForkyObject(update):
when lcDataFork > LightClientDataFork.None:
info "New Beacon LC finality update",
update, slot = forkyObject.attested_header.beacon.slot
let
finalizedSlot = forkyObject.finalized_header.beacon.slot
contentKey = encode(finalityUpdateContentKey(finalizedSlot.uint64))
contentId = beacon_content.toContentId(contentKey)
forkDigest = forkDigestAtEpoch(
forkDigests[], epoch(forkyObject.attested_header.beacon.slot), cfg)
content = encodeFinalityUpdateForked(
forkDigest,
update
)
proc GossipRpcAndClose() {.async.} =
try:
let
contentKeyHex = contentKey.asSeq().toHex()
peers = await portalRpcClient.portal_beaconGossip(
contentKeyHex,
content.toHex())
info "Beacon LC bootstrap gossiped", peers,
contentKey = contentKeyHex
except CatchableError as e:
error "JSON-RPC error", error = $e.msg
await portalRpcClient.close()
asyncSpawn(GossipRpcAndClose())
###
waitFor portalRpcClient.connect(config.rpcAddress, Port(config.rpcPort), false)
if web3Client.isSome():
if config.web3Url.get().kind == HttpUrl:
waitFor (RpcHttpClient(web3Client.get())).connect(config.web3Url.get().web3Url)
info "Listening to incoming network requests"
network.initBeaconSync(cfg, forkDigests, genesisBlockRoot, getBeaconTime)
network.addValidator(
getBeaconBlocksTopic(forkDigests.phase0),
proc (signedBlock: phase0.SignedBeaconBlock): errors.ValidationResult =
toValidationResult(
optimisticProcessor.processSignedBeaconBlock(signedBlock)))
network.addValidator(
getBeaconBlocksTopic(forkDigests.altair),
proc (signedBlock: altair.SignedBeaconBlock): errors.ValidationResult =
toValidationResult(
optimisticProcessor.processSignedBeaconBlock(signedBlock)))
network.addValidator(
getBeaconBlocksTopic(forkDigests.bellatrix),
proc (signedBlock: bellatrix.SignedBeaconBlock): errors.ValidationResult =
toValidationResult(
optimisticProcessor.processSignedBeaconBlock(signedBlock)))
network.addValidator(
getBeaconBlocksTopic(forkDigests.capella),
proc (signedBlock: capella.SignedBeaconBlock): errors.ValidationResult =
toValidationResult(
optimisticProcessor.processSignedBeaconBlock(signedBlock)))
network.addValidator(
getBeaconBlocksTopic(forkDigests.deneb),
proc (signedBlock: deneb.SignedBeaconBlock): errors.ValidationResult =
toValidationResult(
optimisticProcessor.processSignedBeaconBlock(signedBlock)))
lightClient.installMessageValidators()
waitFor network.startListening()
waitFor network.start()
proc onFinalizedHeader(
lightClient: LightClient, finalizedHeader: ForkedLightClientHeader) =
withForkyHeader(finalizedHeader):
when lcDataFork > LightClientDataFork.None:
info "New LC finalized header",
finalized_header = shortLog(forkyHeader)
proc onOptimisticHeader(
lightClient: LightClient, optimisticHeader: ForkedLightClientHeader) =
withForkyHeader(optimisticHeader):
when lcDataFork > LightClientDataFork.None:
info "New LC optimistic header",
optimistic_header = shortLog(forkyHeader)
optimisticProcessor.setOptimisticHeader(forkyHeader.beacon)
lightClient.onFinalizedHeader = onFinalizedHeader
lightClient.onOptimisticHeader = onOptimisticHeader
lightClient.trustedBlockRoot = some config.trustedBlockRoot
if config.beaconLightClient:
lightClient.bootstrapObserver = onBootstrap
lightClient.updateObserver = onUpdate
lightClient.finalityUpdateObserver = onFinalityUpdate
lightClient.optimisticUpdateObserver = onOptimisticUpdate
func shouldSyncOptimistically(wallSlot: Slot): bool =
let optimisticHeader = lightClient.optimisticHeader
withForkyHeader(optimisticHeader):
when lcDataFork > LightClientDataFork.None:
# Check whether light client has synced sufficiently close to wall slot
const maxAge = 2 * SLOTS_PER_EPOCH
forkyHeader.beacon.slot >= max(wallSlot, maxAge.Slot) - maxAge
else:
false
var blocksGossipState: GossipState = {}
proc updateBlocksGossipStatus(slot: Slot) =
let
isBehind = not shouldSyncOptimistically(slot)
targetGossipState = getTargetGossipState(
slot.epoch, cfg.ALTAIR_FORK_EPOCH, cfg.BELLATRIX_FORK_EPOCH,
cfg.CAPELLA_FORK_EPOCH, cfg.DENEB_FORK_EPOCH, isBehind)
template currentGossipState(): auto = blocksGossipState
if currentGossipState == targetGossipState:
return
if currentGossipState.card == 0 and targetGossipState.card > 0:
debug "Enabling blocks topic subscriptions",
wallSlot = slot, targetGossipState
elif currentGossipState.card > 0 and targetGossipState.card == 0:
debug "Disabling blocks topic subscriptions",
wallSlot = slot
else:
# Individual forks added / removed
discard
let
newGossipForks = targetGossipState - currentGossipState
oldGossipForks = currentGossipState - targetGossipState
for gossipFork in oldGossipForks:
let forkDigest = forkDigests[].atConsensusFork(gossipFork)
network.unsubscribe(getBeaconBlocksTopic(forkDigest))
for gossipFork in newGossipForks:
let forkDigest = forkDigests[].atConsensusFork(gossipFork)
network.subscribe(
getBeaconBlocksTopic(forkDigest), blocksTopicParams,
enableTopicMetrics = true)
blocksGossipState = targetGossipState
proc onSecond(time: Moment) =
let wallSlot = getBeaconTime().slotOrZero()
updateBlocksGossipStatus(wallSlot + 1)
lightClient.updateGossipStatus(wallSlot + 1)
proc runOnSecondLoop() {.async.} =
let sleepTime = chronos.seconds(1)
while true:
let start = chronos.now(chronos.Moment)
await chronos.sleepAsync(sleepTime)
let afterSleep = chronos.now(chronos.Moment)
let sleepTime = afterSleep - start
onSecond(start)
let finished = chronos.now(chronos.Moment)
let processingTime = finished - afterSleep
trace "onSecond task completed", sleepTime, processingTime
onSecond(Moment.now())
lightClient.start()
asyncSpawn runOnSecondLoop()
while true:
poll()
when isMainModule:
{.pop.}
var config = makeBannerAndConfig(
"Nimbus beacon chain bridge", BeaconBridgeConf)
{.push raises: [].}
run(config)