nimbus-eth2/research/block_sim.nim

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# beacon_chain
# Copyright (c) 2019-2020 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
confutils, chronicles, stats, times, strformat,
options, random, tables, os,
eth/db/kvstore_sqlite3,
../tests/[testblockutil],
../beacon_chain/spec/[beaconstate, crypto, datatypes, digest, presets,
helpers, validator, signatures, state_transition],
../beacon_chain/[
attestation_pool, beacon_node_types, beacon_chain_db,
interop, validator_pool],
../beacon_chain/block_pools/[
spec_cache, chain_dag, quarantine, clearance],
../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"
# TODO confutils is an impenetrable black box. how can a help text be added here?
cli do(slots = SLOTS_PER_EPOCH * 6,
validators = SLOTS_PER_EPOCH * 200, # 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 = loadGenesis(validators, true)
genesisBlock = get_initial_beacon_block(state[].data)
runtimePreset = defaultRuntimePreset
echo "Starting simulation..."
let db = BeaconChainDB.init(runtimePreset, "block_sim_db")
defer: db.close()
ChainDAGRef.preInit(db, state[].data, state[].data, genesisBlock)
var
chainDag = init(ChainDAGRef, runtimePreset, db)
quarantine = QuarantineRef()
attPool = AttestationPool.init(chainDag, quarantine)
timers: array[Timers, RunningStat]
attesters: RunningStat
r = initRand(1)
let replayState = assignClone(chainDag.headState)
proc handleAttestations(slot: Slot) =
let
attestationHead = chainDag.head.atSlot(slot)
chainDag.withState(chainDag.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, 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].toHashSet(), data.slot)
proc proposeBlock(slot: Slot) =
if rand(r, 1.0) > blockRatio:
return
let
head = chainDag.head
chainDag.withState(chainDag.tmpState, head.atSlot(slot)):
let
proposerIdx = get_beacon_proposer_index(state, cache).get()
privKey = hackPrivKey(state.validators[proposerIdx])
eth1data = get_eth1data_stub(
state.eth1_deposit_index, slot.compute_epoch_at_slot())
message = makeBeaconBlock(
runtimePreset,
hashedState,
proposerIdx,
head.root,
privKey.genRandaoReveal(state.fork, state.genesis_validators_root, slot),
eth1data,
default(GraffitiBytes),
attPool.getAttestationsForBlock(state, cache),
@[],
@[],
@[],
@[],
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: SignedBeaconBlock,
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)
for i in 0..<slots:
let
slot = Slot(i + 1)
t =
if slot.isEpoch: tEpoch
else: tBlock
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)), cache)
echo "Done!"
printTimers(chainDag.headState.data.data, attesters, true, timers)