import asyncdispatch2, spec/[datatypes, crypto, digest, beaconstate], beacon_chain_db, conf const WEAK_SUBJECTVITY_PERIOD* = uint64(4 * 30 * 24 * 60 * 60) div SLOT_DURATION # TODO: This needs revisiting. # Why was the validator WITHDRAWAL_PERIOD altered in the spec? proc obtainTrustedStateSnapshot*(db: BeaconChainDB): Future[BeaconState] {.async.} = # In case our latest state is too old, we must obtain a recent snapshot # of the state from a trusted location. This is explained in detail here: # https://notes.ethereum.org/oaQV3IF5R2qlJuW-V1r1ew#Beacon-chain-sync # TODO: implement this: # # 1. Specify a large set of trusted state signees # (perhaps stored in a config file) # # 2. Download a signed state hash from a known location # (The known location can be either a HTTPS host or a DHT record) # # 3. Check that enough of the specified required signatures are present # # 4. Download a snapshot file from a known location # (or just obtain it from the network using the ETH protocols) # # 5. Check that the state snapshot hash is correct and save it in the DB. discard proc createStateSnapshot*(startup: ChainStartupData, outFile: string) = let initialState = get_initial_beacon_state(startup.validatorDeposits, startup.genesisTime, Eth1Data(), {}) var vr: Validator Json.saveFile(outFile, initialState, pretty = true) echo "Wrote ", outFile