245 lines
8.6 KiB
Nim
245 lines
8.6 KiB
Nim
# beacon_chain
|
|
# Copyright (c) 2019-2021 Status Research & Development GmbH
|
|
# Licensed and distributed under either of
|
|
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
|
|
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
|
|
# at your option. This file may not be copied, modified, or distributed except according to those terms.
|
|
|
|
# `block_sim` is a block and attestation simulator similar to `state_sim` whose
|
|
# task is to run the beacon chain without considering the network or the
|
|
# wall clock. Functionally, it achieves the same as the distributed beacon chain
|
|
# by producing blocks and attestations as if they were created by separate
|
|
# nodes, just like a set of `beacon_node` instances would.
|
|
#
|
|
# Similar to `state_sim`, but uses the block and attestation pools along with
|
|
# a database, as if a real node was running.
|
|
|
|
import
|
|
math, stats, times, strformat,
|
|
options, random, tables, os,
|
|
confutils, chronicles, eth/db/kvstore_sqlite3,
|
|
eth/keys,
|
|
../tests/[testblockutil],
|
|
../beacon_chain/spec/[beaconstate, crypto, datatypes, digest, presets,
|
|
helpers, validator, signatures, state_transition],
|
|
../beacon_chain/[beacon_node_types, beacon_chain_db, extras],
|
|
../beacon_chain/eth1/eth1_monitor,
|
|
../beacon_chain/validators/validator_pool,
|
|
../beacon_chain/consensus_object_pools/[blockchain_dag, block_quarantine, block_clearance, attestation_pool],
|
|
../beacon_chain/ssz/[merkleization, ssz_serialization],
|
|
./simutils
|
|
|
|
type Timers = enum
|
|
tBlock = "Process non-epoch slot with block"
|
|
tEpoch = "Process epoch slot with block"
|
|
tHashBlock = "Tree-hash block"
|
|
tSignBlock = "Sign block"
|
|
tAttest = "Have committee attest to block"
|
|
tReplay = "Replay all produced blocks"
|
|
|
|
proc gauss(r: var Rand; mu = 0.0; sigma = 1.0): float =
|
|
# TODO This is present in Nim 1.4
|
|
const K = sqrt(2 / E)
|
|
var
|
|
a = 0.0
|
|
b = 0.0
|
|
while true:
|
|
a = rand(r, 1.0)
|
|
b = (2.0 * rand(r, 1.0) - 1.0) * K
|
|
if b * b <= -4.0 * a * a * ln(a): break
|
|
result = mu + sigma * (b / a)
|
|
|
|
# TODO confutils is an impenetrable black box. how can a help text be added here?
|
|
cli do(slots = SLOTS_PER_EPOCH * 5,
|
|
validators = SLOTS_PER_EPOCH * 400, # One per shard is minimum
|
|
attesterRatio {.desc: "ratio of validators that attest in each round"} = 0.82,
|
|
blockRatio {.desc: "ratio of slots with blocks"} = 1.0,
|
|
replay = true):
|
|
let
|
|
(state, depositContractSnapshot) = loadGenesis(validators, false)
|
|
genesisBlock = get_initial_beacon_block(state[].data)
|
|
runtimePreset = defaultRuntimePreset
|
|
genesisTime = float state[].data.genesis_time
|
|
|
|
echo "Starting simulation..."
|
|
|
|
let db = BeaconChainDB.new(runtimePreset, "block_sim_db")
|
|
defer: db.close()
|
|
|
|
ChainDAGRef.preInit(db, state[].data, state[].data, genesisBlock)
|
|
putInitialDepositContractSnapshot(db, depositContractSnapshot)
|
|
|
|
var
|
|
chainDag = ChainDAGRef.init(runtimePreset, db)
|
|
eth1Chain = Eth1Chain.init(runtimePreset, db)
|
|
merkleizer = depositContractSnapshot.createMerkleizer
|
|
quarantine = QuarantineRef.init(keys.newRng())
|
|
attPool = AttestationPool.init(chainDag, quarantine)
|
|
timers: array[Timers, RunningStat]
|
|
attesters: RunningStat
|
|
r = initRand(1)
|
|
tmpState = assignClone(chainDag.headState)
|
|
|
|
eth1Chain.addBlock Eth1Block(
|
|
number: Eth1BlockNumber 1,
|
|
timestamp: Eth1BlockTimestamp genesisTime,
|
|
voteData: Eth1Data(
|
|
deposit_root: merkleizer.getDepositsRoot,
|
|
deposit_count: merkleizer.getChunkCount))
|
|
|
|
let replayState = assignClone(chainDag.headState)
|
|
|
|
proc handleAttestations(slot: Slot) =
|
|
let
|
|
attestationHead = chainDag.head.atSlot(slot)
|
|
|
|
chainDag.withState(tmpState[], attestationHead):
|
|
let committees_per_slot =
|
|
get_committee_count_per_slot(state, slot.epoch, cache)
|
|
|
|
for committee_index in 0'u64..<committees_per_slot:
|
|
let committee = get_beacon_committee(
|
|
state, slot, committee_index.CommitteeIndex, cache)
|
|
|
|
for index_in_committee, validatorIdx in committee:
|
|
if rand(r, 1.0) <= attesterRatio:
|
|
let
|
|
data = makeAttestationData(
|
|
state, slot, committee_index.CommitteeIndex, blck.root)
|
|
sig =
|
|
get_attestation_signature(state.fork,
|
|
state.genesis_validators_root,
|
|
data, hackPrivKey(state.validators[validatorIdx]))
|
|
var aggregation_bits = CommitteeValidatorsBits.init(committee.len)
|
|
aggregation_bits.setBit index_in_committee
|
|
|
|
attPool.addAttestation(
|
|
Attestation(
|
|
data: data,
|
|
aggregation_bits: aggregation_bits,
|
|
signature: sig
|
|
), @[validatorIdx], data.slot)
|
|
|
|
proc proposeBlock(slot: Slot) =
|
|
if rand(r, 1.0) > blockRatio:
|
|
return
|
|
|
|
let
|
|
head = chainDag.head
|
|
|
|
chainDag.withState(tmpState[], head.atSlot(slot)):
|
|
let
|
|
finalizedEpochRef = chainDag.getFinalizedEpochRef()
|
|
proposerIdx = get_beacon_proposer_index(state, cache).get()
|
|
privKey = hackPrivKey(state.validators[proposerIdx])
|
|
eth1ProposalData = eth1Chain.getBlockProposalData(
|
|
state,
|
|
finalizedEpochRef.eth1_data,
|
|
finalizedEpochRef.eth1_deposit_index)
|
|
message = makeBeaconBlock(
|
|
runtimePreset,
|
|
hashedState,
|
|
proposerIdx,
|
|
head.root,
|
|
privKey.genRandaoReveal(state.fork, state.genesis_validators_root, slot),
|
|
eth1ProposalData.vote,
|
|
default(GraffitiBytes),
|
|
attPool.getAttestationsForBlock(state, cache),
|
|
eth1ProposalData.deposits,
|
|
@[],
|
|
@[],
|
|
@[],
|
|
noRollback,
|
|
cache)
|
|
|
|
var
|
|
newBlock = SignedBeaconBlock(
|
|
message: message.get()
|
|
)
|
|
|
|
let blockRoot = withTimerRet(timers[tHashBlock]):
|
|
hash_tree_root(newBlock.message)
|
|
newBlock.root = blockRoot
|
|
# Careful, state no longer valid after here because of the await..
|
|
newBlock.signature = withTimerRet(timers[tSignBlock]):
|
|
get_block_signature(
|
|
state.fork, state.genesis_validators_root, newBlock.message.slot,
|
|
blockRoot, privKey)
|
|
|
|
let added = chainDag.addRawBlock(quarantine, newBlock) do (
|
|
blckRef: BlockRef, signedBlock: TrustedSignedBeaconBlock,
|
|
epochRef: EpochRef, state: HashedBeaconState):
|
|
# Callback add to fork choice if valid
|
|
attPool.addForkChoice(epochRef, blckRef, signedBlock.message, blckRef.slot)
|
|
|
|
blck() = added[]
|
|
chainDag.updateHead(added[], quarantine)
|
|
if chainDag.needStateCachesAndForkChoicePruning():
|
|
chainDag.pruneStateCachesDAG()
|
|
attPool.prune()
|
|
|
|
var
|
|
lastEth1BlockAt = genesisTime
|
|
eth1BlockNum = 1000
|
|
|
|
for i in 0..<slots:
|
|
let
|
|
slot = Slot(i + 1)
|
|
t =
|
|
if slot.isEpoch: tEpoch
|
|
else: tBlock
|
|
now = genesisTime + float(slot * SECONDS_PER_SLOT)
|
|
|
|
while true:
|
|
let nextBlockTime = lastEth1BlockAt +
|
|
max(1.0, gauss(r, float SECONDS_PER_ETH1_BLOCK, 3.0))
|
|
if nextBlockTime > now:
|
|
break
|
|
|
|
inc eth1BlockNum
|
|
var eth1Block = Eth1Block(
|
|
number: Eth1BlockNumber eth1BlockNum,
|
|
timestamp: Eth1BlockTimestamp nextBlockTime,
|
|
voteData: Eth1Data(
|
|
block_hash: makeFakeHash(eth1BlockNum)))
|
|
|
|
let newDeposits = int clamp(gauss(r, 5.0, 8.0), 0.0, 1000.0)
|
|
for i in 0 ..< newDeposits:
|
|
let d = makeDeposit(merkleizer.getChunkCount.int, {skipBLSValidation})
|
|
eth1Block.deposits.add d
|
|
merkleizer.addChunk hash_tree_root(d).data
|
|
|
|
eth1Block.voteData.deposit_root = merkleizer.getDepositsRoot
|
|
eth1Block.voteData.deposit_count = merkleizer.getChunkCount
|
|
|
|
eth1Chain.addBlock eth1Block
|
|
lastEth1BlockAt = nextBlockTime
|
|
|
|
if blockRatio > 0.0:
|
|
withTimer(timers[t]):
|
|
proposeBlock(slot)
|
|
if attesterRatio > 0.0:
|
|
withTimer(timers[tAttest]):
|
|
handleAttestations(slot)
|
|
|
|
# TODO if attestation pool was smarter, it would include older attestations
|
|
# too!
|
|
verifyConsensus(chainDag.headState.data.data, attesterRatio * blockRatio)
|
|
|
|
if t == tEpoch:
|
|
echo &". slot: {shortLog(slot)} ",
|
|
&"epoch: {shortLog(slot.compute_epoch_at_slot)}"
|
|
else:
|
|
write(stdout, ".")
|
|
flushFile(stdout)
|
|
|
|
if replay:
|
|
withTimer(timers[tReplay]):
|
|
var cache = StateCache()
|
|
chainDag.updateStateData(
|
|
replayState[], chainDag.head.atSlot(Slot(slots)), false, cache)
|
|
|
|
echo "Done!"
|
|
|
|
printTimers(chainDag.headState.data.data, attesters, true, timers)
|