41 lines
1.5 KiB
Nim
41 lines
1.5 KiB
Nim
import
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asyncdispatch2,
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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 SLOT_DURATION
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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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discard
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proc createStateSnapshot*(startup: ChainStartupData, outFile: string) =
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let initialState = get_initial_beacon_state(startup.validatorDeposits,
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startup.genesisTime,
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Eth2Digest(), {})
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var vr: ValidatorRecord
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Json.saveFile(outFile, initialState, pretty = true)
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echo "Wrote ", outFile
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