mirror of
https://github.com/status-im/nimbus-eth2.git
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03005f48e1
In the ChainDAG, 3 block pointers are kept: genesis, tail and head. This PR adds one more block pointer: the backfill block which represents the block that has been backfilled so far. When doing a checkpoint sync, a random block is given as starting point - this is the tail block, and we require that the tail block has a corresponding state. When backfilling, we end up with blocks without corresponding states, hence we cannot use `tail` as a backfill pointer - there is no state. Nonetheless, we need to keep track of where we are in the backfill process between restarts, such that we can answer GetBeaconBlocksByRange requests. This PR adds the basic support for backfill handling - it needs to be integrated with backfill sync, and the REST API needs to be adjusted to take advantage of the new backfilled blocks when responding to certain requests. Future work will also enable moving the tail in either direction: * pruning means moving the tail forward in time and removing states * backwards means recreating past states from genesis, such that intermediate states are recreated step by step all the way to the tail - at that point, tail, genesis and backfill will match up. * backfilling is done when backfill != genesis - later, this will be the WSS checkpoint instead
432 lines
15 KiB
Nim
432 lines
15 KiB
Nim
# beacon_chain
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# Copyright (c) 2019-2021 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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# `block_sim` is a block and attestation simulator similar to `state_sim` whose
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# task is to run the beacon chain without considering the network or the
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# wall clock. Functionally, it achieves the same as the distributed beacon chain
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# by 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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#
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# Similar to `state_sim`, but uses the block and attestation pools along with
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# a database, as if a real node was running.
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import
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math, stats, times, strformat,
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tables, options, random, tables, os,
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confutils, chronicles, eth/db/kvstore_sqlite3,
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chronos/timer, eth/keys, taskpools,
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../tests/testblockutil,
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../beacon_chain/spec/[
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beaconstate, forks, helpers, signatures, state_transition],
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../beacon_chain/spec/datatypes/[phase0, altair, merge],
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../beacon_chain/[beacon_chain_db, beacon_clock],
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../beacon_chain/eth1/eth1_monitor,
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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_quarantine,
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block_clearance, attestation_pool,
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sync_committee_msg_pool],
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./simutils
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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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template seconds(x: uint64): timer.Duration =
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timer.seconds(int(x))
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func gauss(r: var Rand; mu = 0.0; sigma = 1.0): float =
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# TODO This is present in Nim 1.4
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const K = sqrt(2 / E)
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var
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a = 0.0
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b = 0.0
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while true:
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a = rand(r, 1.0)
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b = (2.0 * rand(r, 1.0) - 1.0) * K
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if b * b <= -4.0 * a * a * ln(a): break
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mu + sigma * (b / a)
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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 * 6,
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validators = SLOTS_PER_EPOCH * 400, # One per shard is minimum
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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"} = 0.75,
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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, depositContractSnapshot) = loadGenesis(validators, false)
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genesisBlock = get_initial_beacon_block(genesisState[])
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genesisTime = float getStateField(genesisState[], genesis_time)
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var
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cfg = defaultRuntimeConfig
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cfg.ALTAIR_FORK_EPOCH = 64.Slot.epoch
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cfg.MERGE_FORK_EPOCH = 128.Slot.epoch
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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[], genesisState[], genesisBlock)
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putInitialDepositContractSnapshot(db, depositContractSnapshot)
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var
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dag = ChainDAGRef.init(cfg, db, {})
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eth1Chain = Eth1Chain.init(cfg, db)
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merkleizer = depositContractSnapshot.createMerkleizer
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taskpool = Taskpool.new()
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verifier = BatchVerifier(rng: keys.newRng(), taskpool: 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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keys.newRng(), eager = proc(): bool = true, taskpool)
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syncCommitteePool = newClone SyncCommitteeMsgPool.init()
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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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voteData: Eth1Data(
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deposit_root: merkleizer.getDepositsRoot,
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deposit_count: merkleizer.getChunkCount))
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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.withState(tmpState[], attestationHead):
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let committees_per_slot =
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get_committee_count_per_slot(stateData.data, slot.epoch, cache)
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for committee_index in 0'u64..<committees_per_slot:
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let committee = get_beacon_committee(
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stateData.data, slot, committee_index.CommitteeIndex, cache)
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for index_in_committee, validatorIdx 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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stateData.data, slot, committee_index.CommitteeIndex, blck.root)
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sig =
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get_attestation_signature(getStateField(stateData.data, fork),
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getStateField(stateData.data, genesis_validators_root),
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data, MockPrivKeys[validatorIdx])
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var aggregation_bits = CommitteeValidatorsBits.init(committee.len)
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aggregation_bits.setBit index_in_committee
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attPool.addAttestation(
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Attestation(
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data: data,
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aggregation_bits: aggregation_bits,
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signature: sig.toValidatorSig()
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), [validatorIdx], sig, data.slot)
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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.genesisValidatorsRoot
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fork = dag.forkAtEpoch(slot.epoch)
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messagesTime = slot.toBeaconTime(seconds(SECONDS_PER_SLOT div 3))
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contributionsTime = slot.toBeaconTime(seconds(2 * SECONDS_PER_SLOT div 3))
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var aggregators: seq[Aggregator]
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for subcommitteeIdx in allSyncSubcommittees():
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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, 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 dag.validateSyncCommitteeMessage(
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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 (positions, cookedSig) = res.get()
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syncCommitteePool[].addSyncCommitteeMessage(
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msg.slot,
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msg.beacon_block_root,
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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, uint64 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.root, 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 dag.validateContribution(
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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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doAssert res.isOk
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syncCommitteePool[].addContribution(
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signedContributionAndProof, res.get())
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proc getNewBlock[T](
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stateData: var StateData, 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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stateData.data, cache, getStateField(stateData.data, slot)).get()
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privKey = MockPrivKeys[proposerIdx]
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eth1ProposalData = eth1Chain.getBlockProposalData(
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stateData.data,
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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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when T is phase0.SignedBeaconBlock:
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SyncAggregate.init()
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elif T is altair.SignedBeaconBlock or T is merge.SignedBeaconBlock:
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syncCommitteePool[].produceSyncAggregate(dag.head.root)
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else:
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static: doAssert false
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hashedState =
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when T is phase0.SignedBeaconBlock:
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addr stateData.data.phase0Data
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elif T is altair.SignedBeaconBlock:
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addr stateData.data.altairData
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elif T is merge.SignedBeaconBlock:
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addr stateData.data.mergeData
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else:
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static: doAssert false
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message = makeBeaconBlock(
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cfg,
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hashedState[],
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proposerIdx,
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privKey.genRandaoReveal(
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getStateField(stateData.data, fork),
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getStateField(stateData.data, genesis_validators_root),
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slot).toValidatorSig(),
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eth1ProposalData.vote,
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default(GraffitiBytes),
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attPool.getAttestationsForBlock(stateData.data, cache),
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eth1ProposalData.deposits,
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BeaconBlockExits(),
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sync_aggregate,
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default(ExecutionPayload),
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noRollback,
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cache)
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var
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newBlock = T(
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message: message.get()
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)
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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(stateData.data, fork),
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getStateField(stateData.data, 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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proc proposePhase0Block(slot: Slot) =
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if rand(r, 1.0) > blockRatio:
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return
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dag.withState(tmpState[], dag.head.atSlot(slot)):
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let
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newBlock = getNewBlock[phase0.SignedBeaconBlock](stateData, slot, cache)
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added = dag.addHeadBlock(verifier, newBlock) do (
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blckRef: BlockRef, signedBlock: phase0.TrustedSignedBeaconBlock,
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epochRef: EpochRef):
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# Callback add to fork choice if valid
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attPool.addForkChoice(
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epochRef, blckRef, signedBlock.message, blckRef.slot)
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blck() = added[]
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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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proc proposeAltairBlock(slot: Slot) =
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if rand(r, 1.0) > blockRatio:
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return
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dag.withState(tmpState[], dag.head.atSlot(slot)):
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let
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newBlock = getNewBlock[altair.SignedBeaconBlock](stateData, slot, cache)
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added = dag.addHeadBlock(verifier, newBlock) do (
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blckRef: BlockRef, signedBlock: altair.TrustedSignedBeaconBlock,
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epochRef: EpochRef):
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# Callback add to fork choice if valid
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attPool.addForkChoice(
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epochRef, blckRef, signedBlock.message, blckRef.slot)
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blck() = added[]
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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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proc proposeMergeBlock(slot: Slot) =
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if rand(r, 1.0) > blockRatio:
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return
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dag.withState(tmpState[], dag.head.atSlot(slot)):
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let
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newBlock = getNewBlock[merge.SignedBeaconBlock](stateData, slot, cache)
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added = dag.addHeadBlock(verifier, newBlock) do (
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blckRef: BlockRef, signedBlock: merge.TrustedSignedBeaconBlock,
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epochRef: EpochRef):
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# Callback add to fork choice if valid
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attPool.addForkChoice(
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epochRef, blckRef, signedBlock.message, blckRef.slot)
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blck() = added[]
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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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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.isEpoch: 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 defaultRuntimeConfig.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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number: Eth1BlockNumber eth1BlockNum,
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timestamp: Eth1BlockTimestamp nextBlockTime,
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voteData: Eth1Data(
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block_hash: makeFakeHash(eth1BlockNum)))
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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.voteData.deposit_root = merkleizer.getDepositsRoot
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eth1Block.voteData.deposit_count = 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.stateForkAtEpoch(slot.epoch)
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of BeaconStateFork.Merge: proposeMergeBlock(slot)
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of BeaconStateFork.Altair: proposeAltairBlock(slot)
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of BeaconStateFork.Phase0: proposePhase0Block(slot)
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if attesterRatio > 0.0:
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withTimer(timers[tAttest]):
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handleAttestations(slot)
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if syncCommitteeRatio > 0.0:
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withTimer(timers[tSyncCommittees]):
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handleSyncCommitteeActions(slot)
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syncCommitteePool[].pruneData(slot)
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# TODO if attestation pool was smarter, it would include older attestations
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# too!
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verifyConsensus(dag.headState.data, attesterRatio * blockRatio)
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if t == tEpoch:
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echo &". slot: {shortLog(slot)} ",
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&"epoch: {shortLog(slot.compute_epoch_at_slot)}"
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else:
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write(stdout, ".")
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flushFile(stdout)
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if replay:
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withTimer(timers[tReplay]):
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var cache = StateCache()
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dag.updateStateData(
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replayState[], dag.head.atSlot(Slot(slots)), false, cache)
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echo "Done!"
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printTimers(dag.headState.data, attesters, true, timers)
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