669 lines
25 KiB
Nim
669 lines
25 KiB
Nim
import
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std/[deques, tables, hashes, options, strformat, strutils],
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chronos, web3, web3/ethtypes as web3Types, json, chronicles,
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eth/common/eth_types, eth/async_utils,
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spec/[datatypes, digest, crypto, beaconstate, helpers],
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ssz, beacon_chain_db, network_metadata, merkle_minimal, beacon_node_status
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export
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web3Types
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contract(DepositContract):
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proc deposit(pubkey: Bytes48,
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withdrawalCredentials: Bytes32,
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signature: Bytes96,
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deposit_data_root: FixedBytes[32])
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proc get_deposit_root(): FixedBytes[32]
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proc get_deposit_count(): Bytes8
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proc DepositEvent(pubkey: Bytes48,
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withdrawalCredentials: Bytes32,
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amount: Bytes8,
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signature: Bytes96,
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index: Bytes8) {.event.}
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# TODO
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# The raises list of this module are still not usable due to general
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# Exceptions being reported from Chronos's asyncfutures2.
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type
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Eth1BlockNumber* = uint64
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Eth1BlockTimestamp* = uint64
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Eth1BlockHeader = web3Types.BlockHeader
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Database* = object
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Eth1Block* = ref object
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number*: Eth1BlockNumber
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timestamp*: Eth1BlockTimestamp
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deposits*: seq[Deposit]
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voteData*: Eth1Data
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activeValidatorsCount*: uint64
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Eth1Chain* = object
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knownStart: Eth1Data
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blocks: Deque[Eth1Block]
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blocksByHash: Table[BlockHash, Eth1Block]
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Eth1Monitor* = ref object
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db: BeaconChainDB
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preset: RuntimePreset
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dataProvider: Web3DataProviderRef
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latestEth1BlockNumber: Eth1BlockNumber
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eth1Progress: AsyncEvent
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eth1Chain: Eth1Chain
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genesisState: NilableBeaconStateRef
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genesisStateFut: Future[void]
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runFut: Future[void]
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Web3DataProvider* = object
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url: string
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web3: Web3
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ns: Sender[DepositContract]
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blockHeadersSubscription: Subscription
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Web3DataProviderRef* = ref Web3DataProvider
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ReorgDepthLimitExceeded = object of CatchableError
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CorruptDataProvider = object of CatchableError
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DisconnectHandler* = proc () {.gcsafe, raises: [Defect].}
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DepositEventHandler* = proc (
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pubkey: Bytes48,
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withdrawalCredentials: Bytes32,
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amount: Bytes8,
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signature: Bytes96, merkleTreeIndex: Bytes8, j: JsonNode) {.raises: [Defect], gcsafe.}
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const
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web3Timeouts = 5.seconds
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hasDepositRootChecks = defined(with_deposit_root_checks)
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template depositContractAddress(m: Eth1Monitor): Eth1Address =
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m.dataProvider.ns.contractAddress
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template web3Url(m: Eth1Monitor): string =
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m.dataProvider.url
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# TODO: Add preset validation
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# MIN_GENESIS_ACTIVE_VALIDATOR_COUNT should be larger than SLOTS_PER_EPOCH
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# doAssert SECONDS_PER_ETH1_BLOCK * preset.ETH1_FOLLOW_DISTANCE < GENESIS_DELAY,
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# "Invalid configuration: GENESIS_DELAY is set too low"
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# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#get_eth1_data
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func compute_time_at_slot(state: BeaconState, slot: Slot): uint64 =
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state.genesis_time + slot * SECONDS_PER_SLOT
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# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#get_eth1_data
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func voting_period_start_time*(state: BeaconState): uint64 =
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let eth1_voting_period_start_slot =
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state.slot - state.slot mod SLOTS_PER_ETH1_VOTING_PERIOD.uint64
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compute_time_at_slot(state, eth1_voting_period_start_slot)
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# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#get_eth1_data
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func is_candidate_block(preset: RuntimePreset, blk: Eth1Block, period_start: uint64): bool =
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(blk.timestamp + SECONDS_PER_ETH1_BLOCK.uint64 * preset.ETH1_FOLLOW_DISTANCE <= period_start) and
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(blk.timestamp + SECONDS_PER_ETH1_BLOCK.uint64 * preset.ETH1_FOLLOW_DISTANCE * 2 >= period_start)
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func asEth2Digest*(x: BlockHash): Eth2Digest =
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Eth2Digest(data: array[32, byte](x))
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template asBlockHash(x: Eth2Digest): BlockHash =
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BlockHash(x.data)
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func shortLog*(b: Eth1Block): string =
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&"{b.number}:{shortLog b.voteData.block_hash}"
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template findBlock*(eth1Chain: Eth1Chain, hash: BlockHash): Eth1Block =
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eth1Chain.blocksByHash.getOrDefault(hash, nil)
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template findBlock*(eth1Chain: Eth1Chain, eth1Data: Eth1Data): Eth1Block =
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getOrDefault(eth1Chain.blocksByHash, asBlockHash(eth1Data.block_hash), nil)
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func latestCandidateBlock(eth1Chain: Eth1Chain,
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preset: RuntimePreset,
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periodStart: uint64): Eth1Block =
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for i in countdown(eth1Chain.blocks.len - 1, 0):
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let blk = eth1Chain.blocks[i]
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if is_candidate_block(preset, blk, periodStart):
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return blk
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func popFirst(eth1Chain: var Eth1Chain) =
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let removed = eth1Chain.blocks.popFirst
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eth1Chain.blocksByHash.del removed.voteData.block_hash.asBlockHash
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func addBlock(eth1Chain: var Eth1Chain, newBlock: Eth1Block) =
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eth1Chain.blocks.addLast newBlock
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eth1Chain.blocksByHash[newBlock.voteData.block_hash.asBlockHash] = newBlock
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template hash*(x: Eth1Block): Hash =
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hash(x.voteData.block_hash.data)
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proc close*(p: Web3DataProviderRef): Future[void] {.async.} =
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if p.blockHeadersSubscription != nil:
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await p.blockHeadersSubscription.unsubscribe()
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await p.web3.close()
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proc getBlockByHash*(p: Web3DataProviderRef, hash: BlockHash):
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Future[BlockObject] =
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return p.web3.provider.eth_getBlockByHash(hash, false)
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proc getBlockByNumber*(p: Web3DataProviderRef,
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number: Eth1BlockNumber): Future[BlockObject] =
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return p.web3.provider.eth_getBlockByNumber(&"0x{number:X}", false)
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proc getBlockNumber(p: Web3DataProviderRef, hash: BlockHash):
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Future[Eth1BlockNumber] {.async.} =
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try:
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let blk = awaitWithTimeout(p.getBlockByHash(hash), web3Timeouts):
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return 0
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return Eth1BlockNumber(blk.number)
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except CatchableError as exc:
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debug "Failed to get Eth1 block number from hash",
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hash = $hash, err = exc.msg
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raise exc
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template readJsonField(j: JsonNode, fieldName: string, ValueType: type): untyped =
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var res: ValueType
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fromJson(j[fieldName], fieldName, res)
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res
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proc depositEventsToBlocks(depositsList: JsonNode): seq[Eth1Block] =
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if depositsList.kind != JArray:
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raise newException(CatchableError,
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"Web3 provider didn't return a list of deposit events")
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var lastEth1Block: Eth1Block
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for logEvent in depositsList:
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let
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blockNumber = Eth1BlockNumber readJsonField(logEvent, "blockNumber", Quantity)
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blockHash = readJsonField(logEvent, "blockHash", BlockHash)
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logData = strip0xPrefix(logEvent["data"].getStr)
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if lastEth1Block == nil or lastEth1Block.number != blockNumber:
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lastEth1Block = Eth1Block(
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number: blockNumber,
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voteData: Eth1Data(block_hash: blockHash.asEth2Digest))
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result.add lastEth1Block
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var
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pubkey: Bytes48
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withdrawalCredentials: Bytes32
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amount: Bytes8
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signature: Bytes96
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index: Bytes8
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var offset = 0
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offset += decode(logData, offset, pubkey)
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offset += decode(logData, offset, withdrawalCredentials)
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offset += decode(logData, offset, amount)
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offset += decode(logData, offset, signature)
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offset += decode(logData, offset, index)
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lastEth1Block.deposits.add Deposit(
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data: DepositData(
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pubkey: ValidatorPubKey.init(array[48, byte](pubkey)),
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withdrawal_credentials: Eth2Digest(data: array[32, byte](withdrawalCredentials)),
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amount: bytes_to_uint64(array[8, byte](amount)),
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signature: ValidatorSig.init(array[96, byte](signature))))
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proc fetchTimestamp(p: Web3DataProviderRef, blk: Eth1Block) {.async.} =
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let web3block = await p.getBlockByHash(blk.voteData.block_hash.asBlockHash)
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blk.timestamp = Eth1BlockTimestamp web3block.timestamp
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when hasDepositRootChecks:
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type
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DepositContractDataStatus = enum
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Fetched
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VerifiedCorrect
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DepositRootIncorrect
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DepositRootUnavailable
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DepositCountIncorrect
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DepositCountUnavailable
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proc fetchDepositContractData(p: Web3DataProviderRef, blk: Eth1Block):
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Future[DepositContractDataStatus] {.async.} =
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let
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depositRoot = p.ns.get_deposit_root.call(blockNumber = blk.number)
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rawCount = p.ns.get_deposit_count.call(blockNumber = blk.number)
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try:
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let fetchedRoot = asEth2Digest(await depositRoot)
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if blk.voteData.deposit_root == default(Eth2Digest):
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blk.voteData.deposit_root = fetchedRoot
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result = Fetched
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elif blk.voteData.deposit_root == fetchedRoot:
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result = VerifiedCorrect
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else:
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result = DepositRootIncorrect
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except CatchableError as err:
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debug "Failed to fetch deposits root",
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blockNumber = blk.number,
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err = err.msg
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result = DepositRootUnavailable
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try:
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let fetchedCount = bytes_to_uint64(array[8, byte](await rawCount))
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if blk.voteData.deposit_count == 0:
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blk.voteData.deposit_count = fetchedCount
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elif blk.voteData.deposit_count != fetchedCount:
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result = DepositCountIncorrect
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except CatchableError as err:
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debug "Failed to fetch deposits count",
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blockNumber = blk.number,
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err = err.msg
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result = DepositCountUnavailable
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proc onBlockHeaders*(p: Web3DataProviderRef,
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blockHeaderHandler: BlockHeaderHandler,
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errorHandler: SubscriptionErrorHandler) {.async.} =
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if p.blockHeadersSubscription != nil:
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await p.blockHeadersSubscription.unsubscribe()
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info "Waiting for new Eth1 block headers"
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p.blockHeadersSubscription = await p.web3.subscribeForBlockHeaders(
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blockHeaderHandler, errorHandler)
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# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#get_eth1_data
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proc getBlockProposalData*(m: Eth1Monitor,
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state: BeaconState,
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finalizedEth1Data: Eth1Data): (Eth1Data, seq[Deposit]) =
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# TODO To make block proposal cheaper, we can perform this action more regularly
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# (e.g. in BeaconNode.onSlot). But keep in mind that this action needs to be
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# performed only when there are validators attached to the node.
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m.db.finalizedEth2DepositsMerkleizer.advanceTo(
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m.db, finalizedEth1Data.deposit_count)
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doAssert(m.db.finalizedEth2DepositsMerkleizer.getFinalHash ==
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finalizedEth1Data.deposit_root)
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let periodStart = voting_period_start_time(state)
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var otherVotesCountTable = initCountTable[Eth1Block]()
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for vote in state.eth1_data_votes:
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let eth1Block = m.eth1Chain.findBlock(vote)
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if eth1Block != nil and
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is_candidate_block(m.preset, eth1Block, periodStart) and
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eth1Block.voteData.deposit_count > state.eth1_data.deposit_count:
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otherVotesCountTable.inc eth1Block
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var pendingDeposits = state.eth1_data.deposit_count - state.eth1_deposit_index
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if otherVotesCountTable.len > 0:
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let (winningBlock, votes) = otherVotesCountTable.largest
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result[0] = winningBlock.voteData
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if uint64((votes + 1) * 2) > SLOTS_PER_ETH1_VOTING_PERIOD:
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pendingDeposits = winningBlock.voteData.deposit_count -
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state.eth1_deposit_index
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else:
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let latestBlock = m.eth1Chain.latestCandidateBlock(m.preset, periodStart)
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if latestBlock == nil:
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result[0] = state.eth1_data
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else:
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result[0] = latestBlock.voteData
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if pendingDeposits > 0:
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let totalDepositsInNewBlock = min(MAX_DEPOSITS, pendingDeposits)
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var
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deposits = newSeq[Deposit](pendingDeposits)
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depositRoots = newSeq[Eth2Digest](pendingDeposits)
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depositsMerkleizerClone = clone m.db.finalizedEth2DepositsMerkleizer
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depositsMerkleizerClone.advanceTo(m.db, state.eth1_deposit_index)
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for i in 0 ..< totalDepositsInNewBlock:
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deposits[i].data = m.db.deposits.get(state.eth1_deposit_index + i)
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depositRoots[i] = hash_tree_root(deposits[i].data)
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let proofs = depositsMerkleizerClone.addChunksAndGenMerkleProofs(depositRoots)
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for i in 0 ..< totalDepositsInNewBlock:
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deposits[i].proof[0..31] = proofs.getProof(i.int)
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deposits[i].proof[32].data[0..7] =
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toBytesLE uint64(state.eth1_deposit_index + i + 1)
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swap(result[1], deposits)
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proc init*(T: type Eth1Monitor,
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db: BeaconChainDB,
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preset: RuntimePreset,
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web3Url: string,
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depositContractAddress: Eth1Address,
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depositContractDeployedAt: string): Future[Result[T, string]] {.async.} =
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let web3 = try: await newWeb3(web3Url)
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except CatchableError as err:
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return err "Failed to setup web3 connection"
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let
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ns = web3.contractSender(DepositContract, depositContractAddress)
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dataProvider = Web3DataProviderRef(url: web3Url, web3: web3, ns: ns)
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let
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previouslyPersistedTo = db.getEth1PersistedTo()
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knownStart = previouslyPersistedTo.get:
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# `previouslyPersistedTo` wall null, we start from scratch
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let deployedAtHash = if depositContractDeployedAt.startsWith "0x":
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try: BlockHash.fromHex depositContractDeployedAt
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except ValueError:
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return err "Invalid hex value specified for deposit-contract-block"
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else:
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let blockNum = try: parseBiggestUInt depositContractDeployedAt
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except ValueError:
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return err "Invalid nummeric value for deposit-contract-block"
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try:
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let blk = await dataProvider.getBlockByNumber(blockNum)
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blk.hash
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except CatchableError:
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return err("Failed to obtain block hash for block number " & $blockNum)
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Eth1Data(block_hash: deployedAtHash.asEth2Digest, deposit_count: 0)
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return ok T(
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db: db,
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preset: preset,
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dataProvider: dataProvider,
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eth1Progress: newAsyncEvent(),
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eth1Chain: Eth1Chain(knownStart: knownStart))
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proc allDepositsUpTo(m: Eth1Monitor, totalDeposits: uint64): seq[Deposit] =
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for i in 0'u64 ..< totalDeposits:
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result.add Deposit(data: m.db.deposits.get(i))
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proc createGenesisState(m: Eth1Monitor, eth1Block: Eth1Block): BeaconStateRef =
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notice "Generating genesis state",
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blockNum = eth1Block.number,
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blockHash = eth1Block.voteData.block_hash,
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blockTimestamp = eth1Block.timestamp,
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totalDeposits = eth1Block.voteData.deposit_count,
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activeValidators = eth1Block.activeValidatorsCount
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var deposits = m.allDepositsUpTo(eth1Block.voteData.deposit_count)
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attachMerkleProofs deposits
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result = initialize_beacon_state_from_eth1(
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m.preset,
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eth1Block.voteData.block_hash,
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eth1Block.timestamp.uint64,
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deposits, {})
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doAssert result.validators.lenu64 == eth1Block.activeValidatorsCount
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proc signalGenesis(m: Eth1Monitor, genesisState: BeaconStateRef) =
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m.genesisState = genesisState
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|
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if not m.genesisStateFut.isNil:
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m.genesisStateFut.complete()
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m.genesisStateFut = nil
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template hasEnoughValidators(m: Eth1Monitor, blk: Eth1Block): bool =
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blk.activeValidatorsCount >= m.preset.MIN_GENESIS_ACTIVE_VALIDATOR_COUNT
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func isAfterMinGenesisTime(m: Eth1Monitor, blk: Eth1Block): bool =
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doAssert blk.timestamp != 0
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let t = genesis_time_from_eth1_timestamp(m.preset, uint64 blk.timestamp)
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t >= m.preset.MIN_GENESIS_TIME
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func isGenesisCandidate(m: Eth1Monitor, blk: Eth1Block): bool =
|
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m.hasEnoughValidators(blk) and m.isAfterMinGenesisTime(blk)
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proc findGenesisBlockInRange(m: Eth1Monitor, startBlock, endBlock: Eth1Block):
|
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Future[Eth1Block] {.async.} =
|
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doAssert startBlock.timestamp != 0 and not m.isAfterMinGenesisTime(startBlock)
|
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doAssert endBlock.timestamp != 0 and m.isAfterMinGenesisTime(endBlock)
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doAssert m.hasEnoughValidators(startBlock)
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doAssert m.hasEnoughValidators(endBlock)
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|
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var
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startBlock = startBlock
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endBlock = endBlock
|
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depositData = startBlock.voteData
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activeValidatorsCountDuringRange = startBlock.activeValidatorsCount
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|
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while startBlock.number + 1 < endBlock.number:
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let
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MIN_GENESIS_TIME = m.preset.MIN_GENESIS_TIME
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startBlockTime = genesis_time_from_eth1_timestamp(m.preset, startBlock.timestamp)
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secondsPerBlock = float(endBlock.timestamp - startBlock.timestamp) /
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float(endBlock.number - startBlock.number)
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blocksToJump = max(float(MIN_GENESIS_TIME - startBlockTime) / secondsPerBlock, 1.0)
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candidateNumber = min(endBlock.number - 1, startBlock.number + blocksToJump.uint64)
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candidateBlock = await m.dataProvider.getBlockByNumber(candidateNumber)
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|
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var candidateAsEth1Block = Eth1Block(number: candidateBlock.number.uint64,
|
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timestamp: candidateBlock.timestamp.uint64,
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voteData: depositData)
|
|
candidateAsEth1Block.voteData.block_hash = candidateBlock.hash.asEth2Digest
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|
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let candidateGenesisTime = genesis_time_from_eth1_timestamp(
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m.preset, candidateBlock.timestamp.uint64)
|
|
|
|
notice "Probing possible genesis block",
|
|
`block` = candidateBlock.number.uint64,
|
|
candidateGenesisTime
|
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|
|
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 "Waiting genesis state"
|
|
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 = mixInLength(
|
|
m.db.finalizedEth1DepositsMerkleizer.getFinalHash,
|
|
int blk.voteData.deposit_count)
|
|
|
|
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()
|
|
|