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nimbus-eth2/beacon_chain/eth1_monitor.nim

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import
std/[deques, tables, hashes, options, strformat, strutils],
chronos, web3, web3/ethtypes as web3Types, json, chronicles,
eth/common/eth_types, eth/async_utils,
spec/[datatypes, digest, crypto, beaconstate, helpers],
ssz, beacon_chain_db, network_metadata, merkle_minimal, beacon_node_status
export
web3Types
contract(DepositContract):
proc deposit(pubkey: Bytes48,
withdrawalCredentials: Bytes32,
signature: Bytes96,
deposit_data_root: FixedBytes[32])
proc get_deposit_root(): FixedBytes[32]
proc get_deposit_count(): Bytes8
proc DepositEvent(pubkey: Bytes48,
withdrawalCredentials: Bytes32,
amount: Bytes8,
signature: Bytes96,
index: Bytes8) {.event.}
# TODO
# The raises list of this module are still not usable due to general
# Exceptions being reported from Chronos's asyncfutures2.
type
Eth1BlockNumber* = uint64
Eth1BlockTimestamp* = uint64
Eth1BlockHeader = web3Types.BlockHeader
Database* = object
Eth1Block* = ref object
number*: Eth1BlockNumber
timestamp*: Eth1BlockTimestamp
deposits*: seq[Deposit]
voteData*: Eth1Data
activeValidatorsCount*: uint64
Eth1Chain* = object
knownStart: Eth1Data
blocks: Deque[Eth1Block]
blocksByHash: Table[BlockHash, Eth1Block]
Eth1Monitor* = ref object
db: BeaconChainDB
preset: RuntimePreset
dataProvider: Web3DataProviderRef
latestEth1BlockNumber: Eth1BlockNumber
eth1Progress: AsyncEvent
eth1Chain: Eth1Chain
genesisState: NilableBeaconStateRef
genesisStateFut: Future[void]
runFut: Future[void]
Web3DataProvider* = object
url: string
web3: Web3
ns: Sender[DepositContract]
blockHeadersSubscription: Subscription
Web3DataProviderRef* = ref Web3DataProvider
ReorgDepthLimitExceeded = object of CatchableError
CorruptDataProvider = object of CatchableError
DisconnectHandler* = proc () {.gcsafe, raises: [Defect].}
DepositEventHandler* = proc (
pubkey: Bytes48,
withdrawalCredentials: Bytes32,
amount: Bytes8,
signature: Bytes96, merkleTreeIndex: Bytes8, j: JsonNode) {.raises: [Defect], gcsafe.}
const
web3Timeouts = 5.seconds
hasDepositRootChecks = defined(with_deposit_root_checks)
template depositContractAddress(m: Eth1Monitor): Eth1Address =
m.dataProvider.ns.contractAddress
template web3Url(m: Eth1Monitor): string =
m.dataProvider.url
proc fixupInfuraUrls*(web3Url: var string) =
## Converts HTTP and HTTPS Infura URLs to their WebSocket equivalents
## because we are missing a functional HTTPS client.
let normalizedUrl = toLowerAscii(web3Url)
var pos = 0
template skip(x: string): bool =
if normalizedUrl.len - pos >= x.len and
normalizedUrl.toOpenArray(pos, pos + x.len - 1) == x:
pos += x.len
true
else:
false
if not (skip("https://") or skip("http://")):
return
let
isMainnet = skip("mainnet")
isGoerli = skip("goerli")
if not (isMainnet or isGoerli):
return
if not skip(".infura.io/v3/"):
return
template infuraKey: string = normalizedUrl.substr(pos)
web3Url = "wss://" & (if isMainnet: "mainnet" else: "goerli") &
".infura.io/ws/v3/" & infuraKey
# TODO: Add preset validation
# MIN_GENESIS_ACTIVE_VALIDATOR_COUNT should be larger than SLOTS_PER_EPOCH
# doAssert SECONDS_PER_ETH1_BLOCK * preset.ETH1_FOLLOW_DISTANCE < GENESIS_DELAY,
# "Invalid configuration: GENESIS_DELAY is set too low"
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#get_eth1_data
func compute_time_at_slot(state: BeaconState, slot: Slot): uint64 =
state.genesis_time + slot * SECONDS_PER_SLOT
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#get_eth1_data
func voting_period_start_time*(state: BeaconState): uint64 =
let eth1_voting_period_start_slot =
state.slot - state.slot mod SLOTS_PER_ETH1_VOTING_PERIOD.uint64
compute_time_at_slot(state, eth1_voting_period_start_slot)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#get_eth1_data
func is_candidate_block(preset: RuntimePreset, blk: Eth1Block, period_start: uint64): bool =
(blk.timestamp + SECONDS_PER_ETH1_BLOCK.uint64 * preset.ETH1_FOLLOW_DISTANCE <= period_start) and
(blk.timestamp + SECONDS_PER_ETH1_BLOCK.uint64 * preset.ETH1_FOLLOW_DISTANCE * 2 >= period_start)
func asEth2Digest*(x: BlockHash): Eth2Digest =
Eth2Digest(data: array[32, byte](x))
template asBlockHash(x: Eth2Digest): BlockHash =
BlockHash(x.data)
func shortLog*(b: Eth1Block): string =
&"{b.number}:{shortLog b.voteData.block_hash}"
template findBlock*(eth1Chain: Eth1Chain, hash: BlockHash): Eth1Block =
eth1Chain.blocksByHash.getOrDefault(hash, nil)
template findBlock*(eth1Chain: Eth1Chain, eth1Data: Eth1Data): Eth1Block =
getOrDefault(eth1Chain.blocksByHash, asBlockHash(eth1Data.block_hash), nil)
func latestCandidateBlock(eth1Chain: Eth1Chain,
preset: RuntimePreset,
periodStart: uint64): Eth1Block =
for i in countdown(eth1Chain.blocks.len - 1, 0):
let blk = eth1Chain.blocks[i]
if is_candidate_block(preset, blk, periodStart):
return blk
func popFirst(eth1Chain: var Eth1Chain) =
let removed = eth1Chain.blocks.popFirst
eth1Chain.blocksByHash.del removed.voteData.block_hash.asBlockHash
func addBlock(eth1Chain: var Eth1Chain, newBlock: Eth1Block) =
eth1Chain.blocks.addLast newBlock
eth1Chain.blocksByHash[newBlock.voteData.block_hash.asBlockHash] = newBlock
template hash*(x: Eth1Block): Hash =
hash(x.voteData.block_hash.data)
proc close*(p: Web3DataProviderRef): Future[void] {.async.} =
if p.blockHeadersSubscription != nil:
await p.blockHeadersSubscription.unsubscribe()
await p.web3.close()
proc getBlockByHash*(p: Web3DataProviderRef, hash: BlockHash):
Future[BlockObject] =
return p.web3.provider.eth_getBlockByHash(hash, false)
proc getBlockByNumber*(p: Web3DataProviderRef,
number: Eth1BlockNumber): Future[BlockObject] =
return p.web3.provider.eth_getBlockByNumber(&"0x{number:X}", false)
proc getBlockNumber(p: Web3DataProviderRef, hash: BlockHash):
Future[Eth1BlockNumber] {.async.} =
try:
let blk = awaitWithTimeout(p.getBlockByHash(hash), web3Timeouts):
return 0
return Eth1BlockNumber(blk.number)
except CatchableError as exc:
debug "Failed to get Eth1 block number from hash",
hash = $hash, err = exc.msg
raise exc
template readJsonField(j: JsonNode, fieldName: string, ValueType: type): untyped =
var res: ValueType
fromJson(j[fieldName], fieldName, res)
res
proc depositEventsToBlocks(depositsList: JsonNode): seq[Eth1Block] =
if depositsList.kind != JArray:
raise newException(CatchableError,
"Web3 provider didn't return a list of deposit events")
var lastEth1Block: Eth1Block
for logEvent in depositsList:
let
blockNumber = Eth1BlockNumber readJsonField(logEvent, "blockNumber", Quantity)
blockHash = readJsonField(logEvent, "blockHash", BlockHash)
logData = strip0xPrefix(logEvent["data"].getStr)
if lastEth1Block == nil or lastEth1Block.number != blockNumber:
lastEth1Block = Eth1Block(
number: blockNumber,
voteData: Eth1Data(block_hash: blockHash.asEth2Digest))
result.add lastEth1Block
var
pubkey: Bytes48
withdrawalCredentials: Bytes32
amount: Bytes8
signature: Bytes96
index: Bytes8
var offset = 0
offset += decode(logData, offset, pubkey)
offset += decode(logData, offset, withdrawalCredentials)
offset += decode(logData, offset, amount)
offset += decode(logData, offset, signature)
offset += decode(logData, offset, index)
lastEth1Block.deposits.add Deposit(
data: DepositData(
pubkey: ValidatorPubKey.init(array[48, byte](pubkey)),
withdrawal_credentials: Eth2Digest(data: array[32, byte](withdrawalCredentials)),
amount: bytes_to_uint64(array[8, byte](amount)),
signature: ValidatorSig.init(array[96, byte](signature))))
proc fetchTimestamp(p: Web3DataProviderRef, blk: Eth1Block) {.async.} =
let web3block = await p.getBlockByHash(blk.voteData.block_hash.asBlockHash)
blk.timestamp = Eth1BlockTimestamp web3block.timestamp
when hasDepositRootChecks:
type
DepositContractDataStatus = enum
Fetched
VerifiedCorrect
DepositRootIncorrect
DepositRootUnavailable
DepositCountIncorrect
DepositCountUnavailable
proc fetchDepositContractData(p: Web3DataProviderRef, blk: Eth1Block):
Future[DepositContractDataStatus] {.async.} =
let
depositRoot = p.ns.get_deposit_root.call(blockNumber = blk.number)
rawCount = p.ns.get_deposit_count.call(blockNumber = blk.number)
try:
let fetchedRoot = asEth2Digest(await depositRoot)
if blk.voteData.deposit_root == default(Eth2Digest):
blk.voteData.deposit_root = fetchedRoot
result = Fetched
elif blk.voteData.deposit_root == fetchedRoot:
result = VerifiedCorrect
else:
result = DepositRootIncorrect
except CatchableError as err:
debug "Failed to fetch deposits root",
blockNumber = blk.number,
err = err.msg
result = DepositRootUnavailable
try:
let fetchedCount = bytes_to_uint64(array[8, byte](await rawCount))
if blk.voteData.deposit_count == 0:
blk.voteData.deposit_count = fetchedCount
elif blk.voteData.deposit_count != fetchedCount:
result = DepositCountIncorrect
except CatchableError as err:
debug "Failed to fetch deposits count",
blockNumber = blk.number,
err = err.msg
result = DepositCountUnavailable
proc onBlockHeaders*(p: Web3DataProviderRef,
blockHeaderHandler: BlockHeaderHandler,
errorHandler: SubscriptionErrorHandler) {.async.} =
if p.blockHeadersSubscription != nil:
await p.blockHeadersSubscription.unsubscribe()
info "Waiting for new Eth1 block headers"
p.blockHeadersSubscription = await p.web3.subscribeForBlockHeaders(
blockHeaderHandler, errorHandler)
func getDepositsRoot(m: DepositsMerkleizer): Eth2Digest =
mixInLength(m.getFinalHash, int m.totalChunks)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#get_eth1_data
proc getBlockProposalData*(m: Eth1Monitor,
state: BeaconState,
finalizedEth1Data: Eth1Data): (Eth1Data, seq[Deposit]) =
var pendingDepositsCount = state.eth1_data.deposit_count -
state.eth1_deposit_index
# TODO To make block proposal cheaper, we can perform this action more regularly
# (e.g. in BeaconNode.onSlot). But keep in mind that this action needs to be
# performed only when there are validators attached to the node.
let ourDepositsCount = m.db.deposits.len
let targetDepositsCount = finalizedEth1Data.deposit_count
let hasLatestDeposits = if ourDepositsCount >= targetDepositsCount:
m.db.finalizedEth2DepositsMerkleizer.advanceTo(m.db, targetDepositsCount)
let ourDepositsRoot = m.db.finalizedEth2DepositsMerkleizer.getDepositsRoot
if (ourDepositsRoot != finalizedEth1Data.deposit_root):
error "Corrupted deposits history. Producing block without deposits",
ourDepositsRoot,
targetDepositsRoot = finalizedEth1Data.deposit_root,
depositsCount = ourDepositsCount
false
else:
true
else:
warn "ETH1 deposits not fully synced. Producing block without deposits",
targetDepositsCount, ourDepositsCount
false
let periodStart = voting_period_start_time(state)
var otherVotesCountTable = initCountTable[Eth1Block]()
for vote in state.eth1_data_votes:
let eth1Block = m.eth1Chain.findBlock(vote)
if eth1Block != nil and
is_candidate_block(m.preset, eth1Block, periodStart) and
eth1Block.voteData.deposit_count > state.eth1_data.deposit_count:
otherVotesCountTable.inc eth1Block
if otherVotesCountTable.len > 0:
let (winningBlock, votes) = otherVotesCountTable.largest
result[0] = winningBlock.voteData
if uint64((votes + 1) * 2) > SLOTS_PER_ETH1_VOTING_PERIOD:
pendingDepositsCount = winningBlock.voteData.deposit_count -
state.eth1_deposit_index
else:
let latestBlock = m.eth1Chain.latestCandidateBlock(m.preset, periodStart)
if latestBlock == nil:
result[0] = state.eth1_data
else:
result[0] = latestBlock.voteData
if pendingDepositsCount > 0 and hasLatestDeposits:
let totalDepositsInNewBlock = min(MAX_DEPOSITS, pendingDepositsCount)
var
deposits = newSeq[Deposit](pendingDepositsCount)
depositRoots = newSeq[Eth2Digest](pendingDepositsCount)
depositsMerkleizerClone = clone m.db.finalizedEth2DepositsMerkleizer
depositsMerkleizerClone.advanceTo(m.db, state.eth1_deposit_index)
for i in 0 ..< totalDepositsInNewBlock:
deposits[i].data = m.db.deposits.get(state.eth1_deposit_index + i)
depositRoots[i] = hash_tree_root(deposits[i].data)
let proofs = depositsMerkleizerClone.addChunksAndGenMerkleProofs(depositRoots)
for i in 0 ..< totalDepositsInNewBlock:
deposits[i].proof[0..31] = proofs.getProof(i.int)
deposits[i].proof[32].data[0..7] =
toBytesLE uint64(state.eth1_deposit_index + i + 1)
swap(result[1], deposits)
proc init*(T: type Eth1Monitor,
db: BeaconChainDB,
preset: RuntimePreset,
web3Url: string,
depositContractAddress: Eth1Address,
depositContractDeployedAt: string): Future[Result[T, string]] {.async.} =
var web3Url = web3Url
fixupInfuraUrls web3Url
let web3 = try: await newWeb3(web3Url)
except CatchableError as err:
return err "Failed to setup web3 connection"
let
ns = web3.contractSender(DepositContract, depositContractAddress)
dataProvider = Web3DataProviderRef(url: web3Url, web3: web3, ns: ns)
let
previouslyPersistedTo = db.getEth1PersistedTo()
knownStart = previouslyPersistedTo.get:
# `previouslyPersistedTo` wall null, we start from scratch
let deployedAtHash = if depositContractDeployedAt.startsWith "0x":
try: BlockHash.fromHex depositContractDeployedAt
except ValueError:
return err "Invalid hex value specified for deposit-contract-block"
else:
let blockNum = try: parseBiggestUInt depositContractDeployedAt
except ValueError:
return err "Invalid nummeric value for deposit-contract-block"
try:
let blk = await dataProvider.getBlockByNumber(blockNum)
blk.hash
except CatchableError:
return err("Failed to obtain block hash for block number " & $blockNum)
Eth1Data(block_hash: deployedAtHash.asEth2Digest, deposit_count: 0)
return ok T(
db: db,
preset: preset,
dataProvider: dataProvider,
eth1Progress: newAsyncEvent(),
eth1Chain: Eth1Chain(knownStart: knownStart))
proc allDepositsUpTo(m: Eth1Monitor, totalDeposits: uint64): seq[Deposit] =
for i in 0'u64 ..< totalDeposits:
result.add Deposit(data: m.db.deposits.get(i))
proc createGenesisState(m: Eth1Monitor, eth1Block: Eth1Block): BeaconStateRef =
notice "Generating genesis state",
blockNum = eth1Block.number,
blockHash = eth1Block.voteData.block_hash,
blockTimestamp = eth1Block.timestamp,
totalDeposits = eth1Block.voteData.deposit_count,
activeValidators = eth1Block.activeValidatorsCount
var deposits = m.allDepositsUpTo(eth1Block.voteData.deposit_count)
attachMerkleProofs deposits
result = initialize_beacon_state_from_eth1(
m.preset,
eth1Block.voteData.block_hash,
eth1Block.timestamp.uint64,
deposits, {})
doAssert result.validators.lenu64 == eth1Block.activeValidatorsCount
proc signalGenesis(m: Eth1Monitor, genesisState: BeaconStateRef) =
m.genesisState = genesisState
if not m.genesisStateFut.isNil:
m.genesisStateFut.complete()
m.genesisStateFut = nil
template hasEnoughValidators(m: Eth1Monitor, blk: Eth1Block): bool =
blk.activeValidatorsCount >= m.preset.MIN_GENESIS_ACTIVE_VALIDATOR_COUNT
func isAfterMinGenesisTime(m: Eth1Monitor, blk: Eth1Block): bool =
doAssert blk.timestamp != 0
let t = genesis_time_from_eth1_timestamp(m.preset, uint64 blk.timestamp)
t >= m.preset.MIN_GENESIS_TIME
func isGenesisCandidate(m: Eth1Monitor, blk: Eth1Block): bool =
m.hasEnoughValidators(blk) and m.isAfterMinGenesisTime(blk)
proc findGenesisBlockInRange(m: Eth1Monitor, startBlock, endBlock: Eth1Block):
Future[Eth1Block] {.async.} =
doAssert startBlock.timestamp != 0 and not m.isAfterMinGenesisTime(startBlock)
doAssert endBlock.timestamp != 0 and m.isAfterMinGenesisTime(endBlock)
doAssert m.hasEnoughValidators(startBlock)
doAssert m.hasEnoughValidators(endBlock)
var
startBlock = startBlock
endBlock = endBlock
depositData = startBlock.voteData
activeValidatorsCountDuringRange = startBlock.activeValidatorsCount
while startBlock.number + 1 < endBlock.number:
let
MIN_GENESIS_TIME = m.preset.MIN_GENESIS_TIME
startBlockTime = genesis_time_from_eth1_timestamp(m.preset, startBlock.timestamp)
secondsPerBlock = float(endBlock.timestamp - startBlock.timestamp) /
float(endBlock.number - startBlock.number)
blocksToJump = max(float(MIN_GENESIS_TIME - startBlockTime) / secondsPerBlock, 1.0)
candidateNumber = min(endBlock.number - 1, startBlock.number + blocksToJump.uint64)
candidateBlock = await m.dataProvider.getBlockByNumber(candidateNumber)
var candidateAsEth1Block = Eth1Block(number: candidateBlock.number.uint64,
timestamp: candidateBlock.timestamp.uint64,
voteData: depositData)
candidateAsEth1Block.voteData.block_hash = candidateBlock.hash.asEth2Digest
let candidateGenesisTime = genesis_time_from_eth1_timestamp(
m.preset, candidateBlock.timestamp.uint64)
notice "Probing possible genesis block",
`block` = candidateBlock.number.uint64,
candidateGenesisTime
if candidateGenesisTime < MIN_GENESIS_TIME:
startBlock = candidateAsEth1Block
else:
endBlock = candidateAsEth1Block
if endBlock.activeValidatorsCount == 0:
endBlock.activeValidatorsCount = activeValidatorsCountDuringRange
return endBlock
proc safeCancel(fut: var Future[void]) =
if not fut.isNil and not fut.finished:
fut.cancel()
fut = nil
proc stop*(m: Eth1Monitor) =
safeCancel m.runFut
proc waitGenesis*(m: Eth1Monitor): Future[BeaconStateRef] {.async.} =
if m.genesisState.isNil:
if m.genesisStateFut.isNil:
m.genesisStateFut = newFuture[void]("waitGenesis")
info "Awaiting genesis event"
await m.genesisStateFut
m.genesisStateFut = nil
if m.genesisState != nil:
return m.genesisState
else:
doAssert bnStatus == BeaconNodeStatus.Stopping
return new BeaconStateRef # cannot return nil...
proc syncBlockRange(m: Eth1Monitor, fromBlock, toBlock: Eth1BlockNumber) {.async.} =
var currentBlock = fromBlock
while currentBlock <= toBlock:
var depositLogs: JsonNode = nil
var blocksPerRequest = 5000'u64 # This is roughly a day of Eth1 blocks
while true:
let requestToBlock = min(toBlock, currentBlock + blocksPerRequest - 1)
debug "Obtaining deposit log events",
fromBlock = currentBlock,
toBlock = requestToBlock
try:
depositLogs = await m.dataProvider.ns.getJsonLogs(
DepositEvent,
fromBlock = some blockId(currentBlock),
toBlock = some blockId(requestToBlock))
currentBlock = requestToBlock + 1
break
except CatchableError as err:
blocksPerRequest = blocksPerRequest div 2
if blocksPerRequest == 0:
raise err
let eth1Blocks = depositEventsToBlocks(depositLogs)
for i in 0 ..< eth1Blocks.len:
# TODO: The DB operations should be executed as a transaction here
let blk = eth1Blocks[i]
for deposit in blk.deposits:
m.db.processDeposit(deposit.data)
blk.voteData.deposit_count =
m.db.finalizedEth1DepositsMerkleizer.totalChunks
blk.voteData.deposit_root =
m.db.finalizedEth1DepositsMerkleizer.getDepositsRoot
blk.activeValidatorsCount = m.db.immutableValidatorData.lenu64
m.eth1Chain.addBlock blk
if eth1Blocks.len > 0:
let lastBlock = eth1Blocks[^1]
when hasDepositRootChecks:
let status = await m.dataProvider.fetchDepositContractData(lastBlock)
debug "Deposit root checks", status,
ourCount = lastBlock.voteData.deposit_count,
ourRoot = lastBlock.voteData.deposit_root
m.db.putEth1PersistedTo lastBlock.voteData
notice "Eth1 sync progress",
blockNumber = lastBlock.number,
depositsProcessed = lastBlock.voteData.deposit_count
if m.genesisStateFut != nil and m.hasEnoughValidators(lastBlock):
await m.dataProvider.fetchTimestamp(lastBlock)
if m.isAfterMinGenesisTime(lastBlock):
var genesisBlockIdx = m.eth1Chain.blocks.len - 1
for i in 1 ..< eth1Blocks.len:
let idx = (m.eth1Chain.blocks.len - 1) - i
let blk = m.eth1Chain.blocks[idx]
await m.dataProvider.fetchTimestamp(blk)
if m.isGenesisCandidate(blk):
genesisBlockIdx = idx
else:
break
# We have a candidate state on our hands, but our current Eth1Chain
# may consist only of blocks that have deposits attached to them
# while the real genesis may have happened in a block without any
# deposits (triggered by MIN_GENESIS_TIME).
#
# This can happen when the beacon node is launched after the genesis
# event. We take a short cut when constructing the initial Eth1Chain
# by downloading only deposit log entries. Thus, we'll see all the
# blocks with deposits, but not the regular blocks in between.
#
# We'll handle this special case below by examing whether we are in
# this potential scenario and we'll use a fast guessing algorith to
# discover the ETh1 block with minimal valid genesis time.
var genesisBlock = m.eth1Chain.blocks[genesisBlockIdx]
if genesisBlockIdx > 0:
let genesisParent = m.eth1Chain.blocks[genesisBlockIdx - 1]
if genesisParent.timestamp == 0:
await m.dataProvider.fetchTimestamp(genesisParent)
if m.hasEnoughValidators(genesisParent) and
genesisBlock.number - genesisParent.number > 1:
genesisBlock = await m.findGenesisBlockInRange(genesisParent,
genesisBlock)
m.signalGenesis m.createGenesisState(genesisBlock)
proc handleEth1Progress(m: Eth1Monitor) {.async.} =
# ATTENTION!
# Please note that this code is using an async event in order
# to guarantee the strict serial order of processing of deposits.
# If we had the same code embedded in the new block headers event,
# it could easily re-order the steps due to the interruptible
# interleaved execution of async code.
var eth1SyncedTo = await m.dataProvider.getBlockNumber(
m.eth1Chain.knownStart.block_hash.asBlockHash)
while true:
if bnStatus == BeaconNodeStatus.Stopping:
if not m.genesisStateFut.isNil:
m.genesisStateFut.complete()
m.genesisStateFut = nil
m.stop()
return
await m.eth1Progress.wait()
m.eth1Progress.clear()
if m.latestEth1BlockNumber <= m.preset.ETH1_FOLLOW_DISTANCE:
continue
let targetBlock = m.latestEth1BlockNumber - m.preset.ETH1_FOLLOW_DISTANCE
if targetBlock <= eth1SyncedTo:
continue
await m.syncBlockRange(eth1SyncedTo + 1, targetBlock)
eth1SyncedTo = targetBlock
while m.eth1Chain.blocks.len > 0:
# We'll clean old blocks that can no longer be voting candidates.
# Technically, we should check that the block is outside of the current
# voting period as determined by its timestamp, but we'll approximate
# this by requiring a much larger difference in block numbers.
# (i.e. twice the follow distance).
let earliestBlock = m.eth1Chain.blocks.peekFirst
if earliestBlock.number < targetBlock and
targetBlock - earliestBlock.number < m.preset.ETH1_FOLLOW_DISTANCE * 2:
break
m.eth1Chain.popFirst()
proc run(m: Eth1Monitor, delayBeforeStart: Duration) {.async.} =
if delayBeforeStart != ZeroDuration:
await sleepAsync(delayBeforeStart)
info "Starting Eth1 deposit contract monitoring",
contract = $m.depositContractAddress, url = m.web3Url
await m.dataProvider.onBlockHeaders do (blk: Eth1BlockHeader)
{.raises: [Defect], gcsafe.}:
try:
if blk.number.uint64 > m.latestEth1BlockNumber:
m.latestEth1BlockNumber = blk.number.uint64
m.eth1Progress.fire()
except Exception:
# TODO Investigate why this exception is being raised
raiseAssert "AsyncEvent.fire should not raise exceptions"
do (err: CatchableError):
debug "Error while processing Eth1 block headers subscription", err = err.msg
await m.handleEth1Progress()
proc start(m: Eth1Monitor, delayBeforeStart: Duration) =
if m.runFut.isNil:
let runFut = m.run(delayBeforeStart)
m.runFut = runFut
runFut.addCallback do (p: pointer):
if runFut.failed:
if runFut.error[] of CatchableError:
if runFut == m.runFut:
error "Eth1 chain monitoring failure, restarting", err = runFut.error.msg
m.stop()
m.start(5.seconds)
else:
fatal "Fatal exception reached", err = runFut.error.msg
quit 1
proc start*(m: Eth1Monitor) {.inline.} =
m.start(0.seconds)
proc getEth1BlockHash*(url: string, blockId: RtBlockIdentifier): Future[BlockHash] {.async.} =
let web3 = await newWeb3(url)
try:
let blk = await web3.provider.eth_getBlockByNumber(blockId, false)
return blk.hash
finally:
await web3.close()
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