511 lines
19 KiB
Nim
511 lines
19 KiB
Nim
# beacon_chain
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# Copyright (c) 2019-2024 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [].}
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# `block_sim` is a block, attestation, and sync committee simulator, whose task
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# is to run the beacon chain without considering the network or the wall clock.
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#
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# Functionally, it achieves the same as the distributed beacon chain by
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# producing blocks and attestations as if they were created by separate
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# nodes, just like a set of `beacon_node` instances would.
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import
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confutils, chronicles, eth/db/kvstore_sqlite3,
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chronos/timer, taskpools,
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../tests/testblockutil,
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../beacon_chain/el/eth1_chain,
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../beacon_chain/spec/[forks, state_transition],
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../beacon_chain/beacon_chain_db,
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../beacon_chain/validators/validator_pool,
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../beacon_chain/gossip_processing/[batch_validation, gossip_validation],
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../beacon_chain/consensus_object_pools/[blockchain_dag, block_clearance],
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./simutils
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from std/random import Rand, gauss, initRand, rand
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from std/stats import RunningStat
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from ../beacon_chain/consensus_object_pools/attestation_pool import
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AttestationPool, addAttestation, addForkChoice, getAttestationsForBlock,
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init, prune
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from ../beacon_chain/consensus_object_pools/block_quarantine import
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Quarantine, init
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from ../beacon_chain/consensus_object_pools/sync_committee_msg_pool import
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SyncCommitteeMsgPool, addContribution, addSyncCommitteeMessage, init,
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produceContribution, produceSyncAggregate, pruneData
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from ../beacon_chain/spec/beaconstate import
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get_beacon_committee, get_beacon_proposer_index,
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get_committee_count_per_slot, get_committee_indices
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from ../beacon_chain/spec/state_transition_block import process_block
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from ../tests/testbcutil import addHeadBlock
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type Timers = enum
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tBlock = "Process non-epoch slot with block"
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tEpoch = "Process epoch slot with block"
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tHashBlock = "Tree-hash block"
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tSignBlock = "Sign block"
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tAttest = "Have committee attest to block"
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tSyncCommittees = "Produce sync committee actions"
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tReplay = "Replay all produced blocks"
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# TODO The rest of nimbus-eth2 uses only the forked version of these, and in
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# general it's better for the validator_duties caller to use the forkedstate
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# version, so isolate these here pending refactoring of block_sim to prefer,
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# when possible, to also use the forked version. It'll be worth keeping some
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# example of the non-forked version because it enables fork bootstrapping.
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proc makeSimulationBlock(
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cfg: RuntimeConfig,
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state: var capella.HashedBeaconState,
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proposer_index: ValidatorIndex,
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randao_reveal: ValidatorSig,
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eth1_data: Eth1Data,
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graffiti: GraffitiBytes,
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attestations: seq[Attestation],
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deposits: seq[Deposit],
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exits: BeaconBlockValidatorChanges,
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sync_aggregate: SyncAggregate,
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execution_payload: capella.ExecutionPayloadForSigning,
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bls_to_execution_changes: SignedBLSToExecutionChangeList,
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rollback: RollbackHashedProc[capella.HashedBeaconState],
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cache: var StateCache,
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# TODO:
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# `verificationFlags` is needed only in tests and can be
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# removed if we don't use invalid signatures there
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verificationFlags: UpdateFlags = {}): Result[capella.BeaconBlock, cstring] =
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## Create a block for the given state. The latest block applied to it will
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## be used for the parent_root value, and the slot will be take from
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## state.slot meaning process_slots must be called up to the slot for which
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## the block is to be created.
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# To create a block, we'll first apply a partial block to the state, skipping
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# some validations.
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var blck = partialBeaconBlock(
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cfg, state, proposer_index, randao_reveal, eth1_data, graffiti,
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attestations, deposits, exits, sync_aggregate, execution_payload)
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let res = process_block(
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cfg, state.data, blck.asSigVerified(), verificationFlags, cache)
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if res.isErr:
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rollback(state)
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return err(res.error())
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state.root = hash_tree_root(state.data)
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blck.state_root = state.root
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ok(blck)
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proc makeSimulationBlock(
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cfg: RuntimeConfig,
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state: var deneb.HashedBeaconState,
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proposer_index: ValidatorIndex,
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randao_reveal: ValidatorSig,
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eth1_data: Eth1Data,
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graffiti: GraffitiBytes,
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attestations: seq[Attestation],
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deposits: seq[Deposit],
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exits: BeaconBlockValidatorChanges,
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sync_aggregate: SyncAggregate,
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execution_payload: deneb.ExecutionPayloadForSigning,
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bls_to_execution_changes: SignedBLSToExecutionChangeList,
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rollback: RollbackHashedProc[deneb.HashedBeaconState],
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cache: var StateCache,
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# TODO:
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# `verificationFlags` is needed only in tests and can be
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# removed if we don't use invalid signatures there
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verificationFlags: UpdateFlags = {}): Result[deneb.BeaconBlock, cstring] =
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## Create a block for the given state. The latest block applied to it will
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## be used for the parent_root value, and the slot will be take from
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## state.slot meaning process_slots must be called up to the slot for which
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## the block is to be created.
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# To create a block, we'll first apply a partial block to the state, skipping
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# some validations.
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var blck = partialBeaconBlock(
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cfg, state, proposer_index, randao_reveal, eth1_data, graffiti,
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attestations, deposits, exits, sync_aggregate, execution_payload)
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let res = process_block(
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cfg, state.data, blck.asSigVerified(), verificationFlags, cache)
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if res.isErr:
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rollback(state)
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return err(res.error())
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state.root = hash_tree_root(state.data)
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blck.state_root = state.root
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ok(blck)
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# TODO confutils is an impenetrable black box. how can a help text be added here?
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cli do(slots = SLOTS_PER_EPOCH * 7,
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validators = SLOTS_PER_EPOCH * 500,
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attesterRatio {.desc: "ratio of validators that attest in each round"} = 0.82,
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syncCommitteeRatio {.desc: "ratio of validators that perform sync committee actions in each round"} = 0.82,
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blockRatio {.desc: "ratio of slots with blocks"} = 1.0,
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replay = true):
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let
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(genesisState, depositTreeSnapshot) = loadGenesis(validators, false)
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genesisTime = float getStateField(genesisState[], genesis_time)
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const cfg = getSimulationConfig()
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echo "Starting simulation..."
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let db = BeaconChainDB.new("block_sim_db")
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defer: db.close()
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ChainDAGRef.preInit(db, genesisState[])
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db.putDepositContractSnapshot(depositTreeSnapshot)
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let rng = HmacDrbgContext.new()
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var
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validatorMonitor = newClone(ValidatorMonitor.init())
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dag = ChainDAGRef.init(cfg, db, validatorMonitor, {})
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eth1Chain = Eth1Chain.init(cfg, db, 0, default Eth2Digest)
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merkleizer = DepositsMerkleizer.init(depositTreeSnapshot.depositContractState)
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taskpool =
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try:
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Taskpool.new()
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except Exception as exc:
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raiseAssert "Failed to initialize Taskpool: " & exc.msg
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verifier = BatchVerifier.init(rng, taskpool)
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quarantine = newClone(Quarantine.init())
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attPool = AttestationPool.init(dag, quarantine)
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batchCrypto = BatchCrypto.new(
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rng, eager = func(): bool = true,
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genesis_validators_root = dag.genesis_validators_root,
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taskpool).expect("working batcher")
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syncCommitteePool = newClone SyncCommitteeMsgPool.init(rng, cfg)
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timers: array[Timers, RunningStat]
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attesters: RunningStat
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r = initRand(1)
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tmpState = assignClone(dag.headState)
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eth1Chain.addBlock Eth1Block(
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number: Eth1BlockNumber 1,
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timestamp: Eth1BlockTimestamp genesisTime)
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let replayState = assignClone(dag.headState)
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proc handleAttestations(slot: Slot) =
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let
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attestationHead = dag.head.atSlot(slot)
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dag.withUpdatedState(tmpState[], attestationHead.toBlockSlotId.expect("not nil")) do:
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let
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fork = getStateField(updatedState, fork)
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genesis_validators_root = getStateField(updatedState, genesis_validators_root)
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committees_per_slot =
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get_committee_count_per_slot(updatedState, slot.epoch, cache)
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for committee_index in get_committee_indices(committees_per_slot):
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let committee = get_beacon_committee(
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updatedState, slot, committee_index, cache)
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for index_in_committee, validator_index in committee:
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if rand(r, 1.0) <= attesterRatio:
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let
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data = makeAttestationData(
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updatedState, slot, committee_index, bid.root)
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sig =
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get_attestation_signature(
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fork, genesis_validators_root, data,
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MockPrivKeys[validator_index])
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attestation = Attestation.init(
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[uint64 index_in_committee], committee.len, data,
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sig.toValidatorSig()).expect("valid data")
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attPool.addAttestation(
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attestation, [validator_index], sig, data.slot.start_beacon_time)
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do:
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raiseAssert "withUpdatedState failed"
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proc handleSyncCommitteeActions(slot: Slot) =
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type
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Aggregator = object
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subcommitteeIdx: SyncSubcommitteeIndex
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validatorIdx: ValidatorIndex
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selectionProof: ValidatorSig
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let
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syncCommittee = @(dag.syncCommitteeParticipants(slot + 1))
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genesis_validators_root = dag.genesis_validators_root
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fork = dag.forkAtEpoch(slot.epoch)
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messagesTime = slot.attestation_deadline()
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contributionsTime = slot.sync_contribution_deadline()
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var aggregators: seq[Aggregator]
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for subcommitteeIdx in SyncSubcommitteeIndex:
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for validatorIdx in syncSubcommittee(syncCommittee, subcommitteeIdx):
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if rand(r, 1.0) > syncCommitteeRatio:
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continue
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let
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validatorPrivKey = MockPrivKeys[validatorIdx]
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signature = get_sync_committee_message_signature(
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fork, genesis_validators_root,
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slot, dag.head.root, validatorPrivKey)
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msg = SyncCommitteeMessage(
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slot: slot,
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beacon_block_root: dag.head.root,
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validator_index: uint64 validatorIdx,
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signature: signature.toValidatorSig)
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let res = waitFor noCancel dag.validateSyncCommitteeMessage(
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quarantine,
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batchCrypto,
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syncCommitteePool,
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msg,
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subcommitteeIdx,
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messagesTime,
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false)
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doAssert res.isOk
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let (bid, cookedSig, positions) = res.get()
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syncCommitteePool[].addSyncCommitteeMessage(
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msg.slot,
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bid,
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msg.validator_index,
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cookedSig,
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subcommitteeIdx,
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positions)
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let
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selectionProofSig = get_sync_committee_selection_proof(
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fork, genesis_validators_root, slot, subcommitteeIdx,
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validatorPrivKey).toValidatorSig
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if is_sync_committee_aggregator(selectionProofSig):
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aggregators.add Aggregator(
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subcommitteeIdx: subcommitteeIdx,
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validatorIdx: validatorIdx,
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selectionProof: selectionProofSig)
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for aggregator in aggregators:
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var contribution: SyncCommitteeContribution
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let contributionWasProduced = syncCommitteePool[].produceContribution(
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slot, dag.head.bid, aggregator.subcommitteeIdx, contribution)
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if contributionWasProduced:
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let
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contributionAndProof = ContributionAndProof(
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aggregator_index: uint64 aggregator.validatorIdx,
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contribution: contribution,
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selection_proof: aggregator.selectionProof)
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validatorPrivKey =
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MockPrivKeys[aggregator.validatorIdx.ValidatorIndex]
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signedContributionAndProof = SignedContributionAndProof(
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message: contributionAndProof,
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signature: get_contribution_and_proof_signature(
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fork, genesis_validators_root, contributionAndProof,
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validatorPrivKey).toValidatorSig)
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res = waitFor noCancel dag.validateContribution(
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quarantine,
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batchCrypto,
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syncCommitteePool,
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signedContributionAndProof,
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contributionsTime,
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false)
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if res.isOk():
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let (bid, sig, _) = res.get
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syncCommitteePool[].addContribution(
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signedContributionAndProof, bid, sig)
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else:
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# We ignore duplicates / already-covered contributions
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doAssert res.error()[0] == ValidationResult.Ignore
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proc getNewBlock[T](
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state: var ForkedHashedBeaconState, slot: Slot, cache: var StateCache): T =
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let
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finalizedEpochRef = dag.getFinalizedEpochRef()
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proposerIdx = get_beacon_proposer_index(
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state, cache, getStateField(state, slot)).get()
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privKey = MockPrivKeys[proposerIdx]
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eth1ProposalData = eth1Chain.getBlockProposalData(
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state,
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finalizedEpochRef.eth1_data,
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finalizedEpochRef.eth1_deposit_index)
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sync_aggregate =
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syncCommitteePool[].produceSyncAggregate(dag.head.bid, slot)
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hashedState =
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when T is capella.SignedBeaconBlock:
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addr state.capellaData
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elif T is deneb.SignedBeaconBlock:
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addr state.denebData
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else:
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static: doAssert false
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message = makeSimulationBlock(
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cfg,
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hashedState[],
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proposerIdx,
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get_epoch_signature(
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getStateField(state, fork),
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getStateField(state, genesis_validators_root),
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slot.epoch, privKey).toValidatorSig(),
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eth1ProposalData.vote,
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default(GraffitiBytes),
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attPool.getAttestationsForBlock(state, cache),
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eth1ProposalData.deposits,
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BeaconBlockValidatorChanges(),
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sync_aggregate,
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when T is deneb.SignedBeaconBlock:
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default(deneb.ExecutionPayloadForSigning)
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elif T is capella.SignedBeaconBlock:
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default(capella.ExecutionPayloadForSigning)
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else:
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default(bellatrix.ExecutionPayloadForSigning),
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static(default(SignedBLSToExecutionChangeList)),
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noRollback,
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cache)
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var newBlock = T(message: message.get())
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let blockRoot = withTimerRet(timers[tHashBlock]):
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hash_tree_root(newBlock.message)
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newBlock.root = blockRoot
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# Careful, state no longer valid after here because of the await..
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newBlock.signature = withTimerRet(timers[tSignBlock]):
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get_block_signature(
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getStateField(state, fork),
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getStateField(state, genesis_validators_root),
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newBlock.message.slot,
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blockRoot, privKey).toValidatorSig()
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newBlock
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# TODO when withUpdatedState's state template doesn't conflict with chronos's
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# HTTP server's state function, combine all proposeForkBlock functions into a
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# single generic function. Until https://github.com/nim-lang/Nim/issues/20811
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# is fixed, that generic function must take `blockRatio` as a parameter.
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proc proposeCapellaBlock(slot: Slot) =
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if rand(r, 1.0) > blockRatio:
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return
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dag.withUpdatedState(tmpState[], dag.getBlockIdAtSlot(slot).expect("block")) do:
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let
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newBlock = getNewBlock[capella.SignedBeaconBlock](updatedState, slot, cache)
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added = dag.addHeadBlock(verifier, newBlock) do (
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blckRef: BlockRef, signedBlock: capella.TrustedSignedBeaconBlock,
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epochRef: EpochRef, unrealized: FinalityCheckpoints):
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# Callback add to fork choice if valid
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attPool.addForkChoice(
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epochRef, blckRef, unrealized, signedBlock.message,
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blckRef.slot.start_beacon_time)
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dag.updateHead(added[], quarantine[], [])
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if dag.needStateCachesAndForkChoicePruning():
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dag.pruneStateCachesDAG()
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attPool.prune()
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do:
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raiseAssert "withUpdatedState failed"
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proc proposeDenebBlock(slot: Slot) =
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if rand(r, 1.0) > blockRatio:
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return
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dag.withUpdatedState(tmpState[], dag.getBlockIdAtSlot(slot).expect("block")) do:
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let
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newBlock = getNewBlock[deneb.SignedBeaconBlock](updatedState, slot, cache)
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added = dag.addHeadBlock(verifier, newBlock) do (
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blckRef: BlockRef, signedBlock: deneb.TrustedSignedBeaconBlock,
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epochRef: EpochRef, unrealized: FinalityCheckpoints):
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# Callback add to fork choice if valid
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attPool.addForkChoice(
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epochRef, blckRef, unrealized, signedBlock.message,
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blckRef.slot.start_beacon_time)
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dag.updateHead(added[], quarantine[], [])
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if dag.needStateCachesAndForkChoicePruning():
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dag.pruneStateCachesDAG()
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attPool.prune()
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do:
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raiseAssert "withUpdatedState failed"
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var
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lastEth1BlockAt = genesisTime
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eth1BlockNum = 1000
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for i in 0..<slots:
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let
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slot = Slot(i + 1)
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t =
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if slot.is_epoch: tEpoch
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else: tBlock
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now = genesisTime + float(slot * SECONDS_PER_SLOT)
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while true:
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let nextBlockTime = lastEth1BlockAt +
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max(1.0, gauss(r, float cfg.SECONDS_PER_ETH1_BLOCK, 3.0))
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if nextBlockTime > now:
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break
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inc eth1BlockNum
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var eth1Block = Eth1Block(
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hash: makeFakeHash(eth1BlockNum),
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number: Eth1BlockNumber eth1BlockNum,
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timestamp: Eth1BlockTimestamp nextBlockTime)
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let newDeposits = int clamp(gauss(r, 5.0, 8.0), 0.0, 1000.0)
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for i in 0 ..< newDeposits:
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let validatorIdx = merkleizer.getChunkCount.int
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let d = makeDeposit(validatorIdx, {skipBlsValidation})
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eth1Block.deposits.add d
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merkleizer.addChunk hash_tree_root(d).data
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eth1Block.depositRoot = merkleizer.getDepositsRoot
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eth1Block.depositCount = merkleizer.getChunkCount
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eth1Chain.addBlock eth1Block
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lastEth1BlockAt = nextBlockTime
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if blockRatio > 0.0:
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withTimer(timers[t]):
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case dag.cfg.consensusForkAtEpoch(slot.epoch)
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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)
|