nimbus-eth2/research/block_sim.nim

511 lines
19 KiB
Nim

# beacon_chain
# Copyright (c) 2019-2024 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.
{.push raises: [].}
# `block_sim` is a block, attestation, and sync committee simulator, 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.
import
confutils, chronicles, eth/db/kvstore_sqlite3,
chronos/timer, taskpools,
../tests/testblockutil,
../beacon_chain/el/eth1_chain,
../beacon_chain/spec/[forks, state_transition],
../beacon_chain/beacon_chain_db,
../beacon_chain/validators/validator_pool,
../beacon_chain/gossip_processing/[batch_validation, gossip_validation],
../beacon_chain/consensus_object_pools/[blockchain_dag, block_clearance],
./simutils
from std/random import Rand, gauss, initRand, rand
from std/stats import RunningStat
from ../beacon_chain/consensus_object_pools/attestation_pool import
AttestationPool, addAttestation, addForkChoice, getAttestationsForBlock,
init, prune
from ../beacon_chain/consensus_object_pools/block_quarantine import
Quarantine, init
from ../beacon_chain/consensus_object_pools/sync_committee_msg_pool import
SyncCommitteeMsgPool, addContribution, addSyncCommitteeMessage, init,
produceContribution, produceSyncAggregate, pruneData
from ../beacon_chain/spec/beaconstate import
get_beacon_committee, get_beacon_proposer_index,
get_committee_count_per_slot, get_committee_indices
from ../beacon_chain/spec/state_transition_block import process_block
from ../tests/testbcutil import addHeadBlock
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"
tSyncCommittees = "Produce sync committee actions"
tReplay = "Replay all produced blocks"
# TODO The rest of nimbus-eth2 uses only the forked version of these, and in
# general it's better for the validator_duties caller to use the forkedstate
# version, so isolate these here pending refactoring of block_sim to prefer,
# when possible, to also use the forked version. It'll be worth keeping some
# example of the non-forked version because it enables fork bootstrapping.
proc makeSimulationBlock(
cfg: RuntimeConfig,
state: var capella.HashedBeaconState,
proposer_index: ValidatorIndex,
randao_reveal: ValidatorSig,
eth1_data: Eth1Data,
graffiti: GraffitiBytes,
attestations: seq[Attestation],
deposits: seq[Deposit],
exits: BeaconBlockValidatorChanges,
sync_aggregate: SyncAggregate,
execution_payload: capella.ExecutionPayloadForSigning,
bls_to_execution_changes: SignedBLSToExecutionChangeList,
rollback: RollbackHashedProc[capella.HashedBeaconState],
cache: var StateCache,
# TODO:
# `verificationFlags` is needed only in tests and can be
# removed if we don't use invalid signatures there
verificationFlags: UpdateFlags = {}): Result[capella.BeaconBlock, cstring] =
## Create a block for the given state. The latest block applied to it will
## be used for the parent_root value, and the slot will be take from
## state.slot meaning process_slots must be called up to the slot for which
## the block is to be created.
# To create a block, we'll first apply a partial block to the state, skipping
# some validations.
var blck = partialBeaconBlock(
cfg, state, proposer_index, randao_reveal, eth1_data, graffiti,
attestations, deposits, exits, sync_aggregate, execution_payload)
let res = process_block(
cfg, state.data, blck.asSigVerified(), verificationFlags, cache)
if res.isErr:
rollback(state)
return err(res.error())
state.root = hash_tree_root(state.data)
blck.state_root = state.root
ok(blck)
proc makeSimulationBlock(
cfg: RuntimeConfig,
state: var deneb.HashedBeaconState,
proposer_index: ValidatorIndex,
randao_reveal: ValidatorSig,
eth1_data: Eth1Data,
graffiti: GraffitiBytes,
attestations: seq[Attestation],
deposits: seq[Deposit],
exits: BeaconBlockValidatorChanges,
sync_aggregate: SyncAggregate,
execution_payload: deneb.ExecutionPayloadForSigning,
bls_to_execution_changes: SignedBLSToExecutionChangeList,
rollback: RollbackHashedProc[deneb.HashedBeaconState],
cache: var StateCache,
# TODO:
# `verificationFlags` is needed only in tests and can be
# removed if we don't use invalid signatures there
verificationFlags: UpdateFlags = {}): Result[deneb.BeaconBlock, cstring] =
## Create a block for the given state. The latest block applied to it will
## be used for the parent_root value, and the slot will be take from
## state.slot meaning process_slots must be called up to the slot for which
## the block is to be created.
# To create a block, we'll first apply a partial block to the state, skipping
# some validations.
var blck = partialBeaconBlock(
cfg, state, proposer_index, randao_reveal, eth1_data, graffiti,
attestations, deposits, exits, sync_aggregate, execution_payload)
let res = process_block(
cfg, state.data, blck.asSigVerified(), verificationFlags, cache)
if res.isErr:
rollback(state)
return err(res.error())
state.root = hash_tree_root(state.data)
blck.state_root = state.root
ok(blck)
# TODO confutils is an impenetrable black box. how can a help text be added here?
cli do(slots = SLOTS_PER_EPOCH * 7,
validators = SLOTS_PER_EPOCH * 500,
attesterRatio {.desc: "ratio of validators that attest in each round"} = 0.82,
syncCommitteeRatio {.desc: "ratio of validators that perform sync committee actions in each round"} = 0.82,
blockRatio {.desc: "ratio of slots with blocks"} = 1.0,
replay = true):
let
(genesisState, depositTreeSnapshot) = loadGenesis(validators, false)
genesisTime = float getStateField(genesisState[], genesis_time)
const cfg = getSimulationConfig()
echo "Starting simulation..."
let db = BeaconChainDB.new("block_sim_db")
defer: db.close()
ChainDAGRef.preInit(db, genesisState[])
db.putDepositContractSnapshot(depositTreeSnapshot)
let rng = HmacDrbgContext.new()
var
validatorMonitor = newClone(ValidatorMonitor.init())
dag = ChainDAGRef.init(cfg, db, validatorMonitor, {})
eth1Chain = Eth1Chain.init(cfg, db, 0, default Eth2Digest)
merkleizer = DepositsMerkleizer.init(depositTreeSnapshot.depositContractState)
taskpool =
try:
Taskpool.new()
except Exception as exc:
raiseAssert "Failed to initialize Taskpool: " & exc.msg
verifier = BatchVerifier.init(rng, taskpool)
quarantine = newClone(Quarantine.init())
attPool = AttestationPool.init(dag, quarantine)
batchCrypto = BatchCrypto.new(
rng, eager = func(): bool = true,
genesis_validators_root = dag.genesis_validators_root,
taskpool).expect("working batcher")
syncCommitteePool = newClone SyncCommitteeMsgPool.init(rng, cfg)
timers: array[Timers, RunningStat]
attesters: RunningStat
r = initRand(1)
tmpState = assignClone(dag.headState)
eth1Chain.addBlock Eth1Block(
number: Eth1BlockNumber 1,
timestamp: Eth1BlockTimestamp genesisTime)
let replayState = assignClone(dag.headState)
proc handleAttestations(slot: Slot) =
let
attestationHead = dag.head.atSlot(slot)
dag.withUpdatedState(tmpState[], attestationHead.toBlockSlotId.expect("not nil")) do:
let
fork = getStateField(updatedState, fork)
genesis_validators_root = getStateField(updatedState, genesis_validators_root)
committees_per_slot =
get_committee_count_per_slot(updatedState, slot.epoch, cache)
for committee_index in get_committee_indices(committees_per_slot):
let committee = get_beacon_committee(
updatedState, slot, committee_index, cache)
for index_in_committee, validator_index in committee:
if rand(r, 1.0) <= attesterRatio:
let
data = makeAttestationData(
updatedState, slot, committee_index, bid.root)
sig =
get_attestation_signature(
fork, genesis_validators_root, data,
MockPrivKeys[validator_index])
attestation = Attestation.init(
[uint64 index_in_committee], committee.len, data,
sig.toValidatorSig()).expect("valid data")
attPool.addAttestation(
attestation, [validator_index], sig, data.slot.start_beacon_time)
do:
raiseAssert "withUpdatedState failed"
proc handleSyncCommitteeActions(slot: Slot) =
type
Aggregator = object
subcommitteeIdx: SyncSubcommitteeIndex
validatorIdx: ValidatorIndex
selectionProof: ValidatorSig
let
syncCommittee = @(dag.syncCommitteeParticipants(slot + 1))
genesis_validators_root = dag.genesis_validators_root
fork = dag.forkAtEpoch(slot.epoch)
messagesTime = slot.attestation_deadline()
contributionsTime = slot.sync_contribution_deadline()
var aggregators: seq[Aggregator]
for subcommitteeIdx in SyncSubcommitteeIndex:
for validatorIdx in syncSubcommittee(syncCommittee, subcommitteeIdx):
if rand(r, 1.0) > syncCommitteeRatio:
continue
let
validatorPrivKey = MockPrivKeys[validatorIdx]
signature = get_sync_committee_message_signature(
fork, genesis_validators_root,
slot, dag.head.root, validatorPrivKey)
msg = SyncCommitteeMessage(
slot: slot,
beacon_block_root: dag.head.root,
validator_index: uint64 validatorIdx,
signature: signature.toValidatorSig)
let res = waitFor noCancel dag.validateSyncCommitteeMessage(
quarantine,
batchCrypto,
syncCommitteePool,
msg,
subcommitteeIdx,
messagesTime,
false)
doAssert res.isOk
let (bid, cookedSig, positions) = res.get()
syncCommitteePool[].addSyncCommitteeMessage(
msg.slot,
bid,
msg.validator_index,
cookedSig,
subcommitteeIdx,
positions)
let
selectionProofSig = get_sync_committee_selection_proof(
fork, genesis_validators_root, slot, subcommitteeIdx,
validatorPrivKey).toValidatorSig
if is_sync_committee_aggregator(selectionProofSig):
aggregators.add Aggregator(
subcommitteeIdx: subcommitteeIdx,
validatorIdx: validatorIdx,
selectionProof: selectionProofSig)
for aggregator in aggregators:
var contribution: SyncCommitteeContribution
let contributionWasProduced = syncCommitteePool[].produceContribution(
slot, dag.head.bid, aggregator.subcommitteeIdx, contribution)
if contributionWasProduced:
let
contributionAndProof = ContributionAndProof(
aggregator_index: uint64 aggregator.validatorIdx,
contribution: contribution,
selection_proof: aggregator.selectionProof)
validatorPrivKey =
MockPrivKeys[aggregator.validatorIdx.ValidatorIndex]
signedContributionAndProof = SignedContributionAndProof(
message: contributionAndProof,
signature: get_contribution_and_proof_signature(
fork, genesis_validators_root, contributionAndProof,
validatorPrivKey).toValidatorSig)
res = waitFor noCancel dag.validateContribution(
quarantine,
batchCrypto,
syncCommitteePool,
signedContributionAndProof,
contributionsTime,
false)
if res.isOk():
let (bid, sig, _) = res.get
syncCommitteePool[].addContribution(
signedContributionAndProof, bid, sig)
else:
# We ignore duplicates / already-covered contributions
doAssert res.error()[0] == ValidationResult.Ignore
proc getNewBlock[T](
state: var ForkedHashedBeaconState, slot: Slot, cache: var StateCache): T =
let
finalizedEpochRef = dag.getFinalizedEpochRef()
proposerIdx = get_beacon_proposer_index(
state, cache, getStateField(state, slot)).get()
privKey = MockPrivKeys[proposerIdx]
eth1ProposalData = eth1Chain.getBlockProposalData(
state,
finalizedEpochRef.eth1_data,
finalizedEpochRef.eth1_deposit_index)
sync_aggregate =
syncCommitteePool[].produceSyncAggregate(dag.head.bid, slot)
hashedState =
when T is capella.SignedBeaconBlock:
addr state.capellaData
elif T is deneb.SignedBeaconBlock:
addr state.denebData
else:
static: doAssert false
message = makeSimulationBlock(
cfg,
hashedState[],
proposerIdx,
get_epoch_signature(
getStateField(state, fork),
getStateField(state, genesis_validators_root),
slot.epoch, privKey).toValidatorSig(),
eth1ProposalData.vote,
default(GraffitiBytes),
attPool.getAttestationsForBlock(state, cache),
eth1ProposalData.deposits,
BeaconBlockValidatorChanges(),
sync_aggregate,
when T is deneb.SignedBeaconBlock:
default(deneb.ExecutionPayloadForSigning)
elif T is capella.SignedBeaconBlock:
default(capella.ExecutionPayloadForSigning)
else:
default(bellatrix.ExecutionPayloadForSigning),
static(default(SignedBLSToExecutionChangeList)),
noRollback,
cache)
var newBlock = T(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(
getStateField(state, fork),
getStateField(state, genesis_validators_root),
newBlock.message.slot,
blockRoot, privKey).toValidatorSig()
newBlock
# TODO when withUpdatedState's state template doesn't conflict with chronos's
# HTTP server's state function, combine all proposeForkBlock functions into a
# single generic function. Until https://github.com/nim-lang/Nim/issues/20811
# is fixed, that generic function must take `blockRatio` as a parameter.
proc proposeCapellaBlock(slot: Slot) =
if rand(r, 1.0) > blockRatio:
return
dag.withUpdatedState(tmpState[], dag.getBlockIdAtSlot(slot).expect("block")) do:
let
newBlock = getNewBlock[capella.SignedBeaconBlock](updatedState, slot, cache)
added = dag.addHeadBlock(verifier, newBlock) do (
blckRef: BlockRef, signedBlock: capella.TrustedSignedBeaconBlock,
epochRef: EpochRef, unrealized: FinalityCheckpoints):
# Callback add to fork choice if valid
attPool.addForkChoice(
epochRef, blckRef, unrealized, signedBlock.message,
blckRef.slot.start_beacon_time)
dag.updateHead(added[], quarantine[], [])
if dag.needStateCachesAndForkChoicePruning():
dag.pruneStateCachesDAG()
attPool.prune()
do:
raiseAssert "withUpdatedState failed"
proc proposeDenebBlock(slot: Slot) =
if rand(r, 1.0) > blockRatio:
return
dag.withUpdatedState(tmpState[], dag.getBlockIdAtSlot(slot).expect("block")) do:
let
newBlock = getNewBlock[deneb.SignedBeaconBlock](updatedState, slot, cache)
added = dag.addHeadBlock(verifier, newBlock) do (
blckRef: BlockRef, signedBlock: deneb.TrustedSignedBeaconBlock,
epochRef: EpochRef, unrealized: FinalityCheckpoints):
# Callback add to fork choice if valid
attPool.addForkChoice(
epochRef, blckRef, unrealized, signedBlock.message,
blckRef.slot.start_beacon_time)
dag.updateHead(added[], quarantine[], [])
if dag.needStateCachesAndForkChoicePruning():
dag.pruneStateCachesDAG()
attPool.prune()
do:
raiseAssert "withUpdatedState failed"
var
lastEth1BlockAt = genesisTime
eth1BlockNum = 1000
for i in 0..<slots:
let
slot = Slot(i + 1)
t =
if slot.is_epoch: tEpoch
else: tBlock
now = genesisTime + float(slot * SECONDS_PER_SLOT)
while true:
let nextBlockTime = lastEth1BlockAt +
max(1.0, gauss(r, float cfg.SECONDS_PER_ETH1_BLOCK, 3.0))
if nextBlockTime > now:
break
inc eth1BlockNum
var eth1Block = Eth1Block(
hash: makeFakeHash(eth1BlockNum),
number: Eth1BlockNumber eth1BlockNum,
timestamp: Eth1BlockTimestamp nextBlockTime)
let newDeposits = int clamp(gauss(r, 5.0, 8.0), 0.0, 1000.0)
for i in 0 ..< newDeposits:
let validatorIdx = merkleizer.getChunkCount.int
let d = makeDeposit(validatorIdx, {skipBlsValidation})
eth1Block.deposits.add d
merkleizer.addChunk hash_tree_root(d).data
eth1Block.depositRoot = merkleizer.getDepositsRoot
eth1Block.depositCount = merkleizer.getChunkCount
eth1Chain.addBlock eth1Block
lastEth1BlockAt = nextBlockTime
if blockRatio > 0.0:
withTimer(timers[t]):
case dag.cfg.consensusForkAtEpoch(slot.epoch)
of ConsensusFork.Deneb: proposeDenebBlock(slot)
of ConsensusFork.Capella: proposeCapellaBlock(slot)
of ConsensusFork.Bellatrix, ConsensusFork.Altair, ConsensusFork.Phase0:
doAssert false
if attesterRatio > 0.0:
withTimer(timers[tAttest]):
handleAttestations(slot)
if syncCommitteeRatio > 0.0:
withTimer(timers[tSyncCommittees]):
handleSyncCommitteeActions(slot)
syncCommitteePool[].pruneData(slot)
# TODO if attestation pool was smarter, it would include older attestations
# too!
verifyConsensus(dag.headState, attesterRatio * blockRatio)
if t == tEpoch:
echo ". slot: ", shortLog(slot), " epoch: ", shortLog(slot.epoch)
else:
try:
write(stdout, ".")
except IOError:
discard
flushFile(stdout)
if replay:
withTimer(timers[tReplay]):
var cache = StateCache()
doAssert dag.updateState(
replayState[], dag.getBlockIdAtSlot(Slot(slots)).expect("block"),
false, cache)
echo "Done!"
printTimers(dag.headState, attesters, true, timers)