60 lines
2.3 KiB
Nim
60 lines
2.3 KiB
Nim
import
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chronos, web3, json,
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spec/[datatypes, digest, crypto, beaconstate, helpers, validator],
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conf, extras
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contract(DepositContract):
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proc deposit(pubkey: Bytes48, withdrawalCredentials: Bytes32, signature: Bytes96)
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proc DepositEvent(pubkey: Bytes48, withdrawalCredentials: Bytes32, amount: Bytes8, signature: Bytes96, index: Bytes8) {.event.}
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const MIN_GENESIS_TIME = 0
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type
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QueueElement = (BlockHash, DepositData)
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DepositCollector = ref object
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deposits: seq[datatypes.Deposit]
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queue: AsyncQueue[QueueElement]
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proc processDeposit(d: DepositCollector, web3: Web3): Future[BeaconState] {.async.} =
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while true:
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let (blkHash, data) = await d.queue.popFirst()
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let blk = await web3.provider.eth_getBlockByHash(blkHash, false)
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let dep = datatypes.Deposit(data: data)
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d.deposits.add(dep)
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if d.deposits.len >= SLOTS_PER_EPOCH and d.deposits.len >= MIN_GENESIS_ACTIVE_VALIDATOR_COUNT and blk.timestamp.uint64 >= MIN_GENESIS_TIME.uint64:
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# This block is a genesis candidate
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var h: Eth2Digest
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h.data = array[32, byte](blkHash)
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let s = initialize_beacon_state_from_eth1(h, blk.timestamp.uint64, d.deposits, {skipValidation})
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if is_valid_genesis_state(s):
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return s
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proc getGenesisFromEth1*(conf: BeaconNodeConf): Future[BeaconState] {.async.} =
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let web3 = await newWeb3(conf.depositWeb3Url)
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let contractAddress = Address.fromHex(conf.depositContractAddress)
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let ns = web3.contractSender(DepositContract, contractAddress)
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var deposits = DepositCollector()
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deposits.queue = newAsyncQueue[QueueElement]()
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let s = await ns.subscribe(DepositEvent, %*{"fromBlock": "0x0"}) do(pubkey: Bytes48, withdrawalCredentials: Bytes32, amount: Bytes8, signature: Bytes96, merkleTreeIndex: Bytes8, j: JsonNode):
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let blkHash = BlockHash.fromHex(j["blockHash"].getStr())
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let amount = bytes_to_int(array[8, byte](amount))
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deposits.queue.addLastNoWait((blkHash,
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DepositData(pubkey: ValidatorPubKey.init(array[48, byte](pubkey)),
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withdrawal_credentials: Eth2Digest(data: array[32, byte](withdrawalCredentials)),
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amount: amount,
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signature: ValidatorSig.init(array[96, byte](signature)))))
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let genesisState = await processDeposit(deposits, web3)
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await s.unsubscribe()
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return genesisState
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