48 lines
1.7 KiB
Nim
48 lines
1.7 KiB
Nim
import
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ospaths, chronos, json_serialization, strformat,
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spec/[datatypes, crypto, digest, beaconstate], beacon_chain_db, conf
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const
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WEAK_SUBJECTVITY_PERIOD* = uint64(4 * 30 * 24 * 60 * 60) div SECONDS_PER_SLOT
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# TODO: This needs revisiting.
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# Why was the validator WITHDRAWAL_PERIOD altered in the spec?
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proc obtainTrustedStateSnapshot*(db: BeaconChainDB): Future[BeaconState] {.async.} =
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# In case our latest state is too old, we must obtain a recent snapshot
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# of the state from a trusted location. This is explained in detail here:
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# https://notes.ethereum.org/oaQV3IF5R2qlJuW-V1r1ew#Beacon-chain-sync
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# TODO: implement this:
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#
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# 1. Specify a large set of trusted state signees
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# (perhaps stored in a config file)
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#
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# 2. Download a signed state hash from a known location
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# (The known location can be either a HTTPS host or a DHT record)
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#
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# 3. Check that enough of the specified required signatures are present
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#
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# 4. Download a snapshot file from a known location
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# (or just obtain it from the network using the ETH protocols)
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#
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# 5. Check that the state snapshot hash is correct and save it in the DB.
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doAssert(false, "Not implemented")
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proc createStateSnapshot*(
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validatorDir: string, numValidators, firstValidator, genesisOffset: int,
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outFile: string) =
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var deposits: seq[Deposit]
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for i in firstValidator..<numValidators:
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deposits.add Json.loadFile(validatorDir / &"v{i:07}.deposit.json", Deposit)
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let initialState = get_genesis_beacon_state(
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deposits,
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uint64(int(fastEpochTime() div 1000) + genesisOffset),
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Eth1Data(), {})
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var vr: Validator
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Json.saveFile(outFile, initialState, pretty = true)
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echo "Wrote ", outFile
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