171 lines
6.1 KiB
Nim
171 lines
6.1 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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# `state_sim` runs the state transition function in isolation, creating blocks
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# and attesting to them as if the network was running as a whole.
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import
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confutils, stats, times,
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strformat,
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options, sequtils, random, tables,
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../tests/testblockutil,
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../beacon_chain/spec/datatypes/phase0,
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../beacon_chain/spec/eth2_apis/eth2_rest_serialization,
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../beacon_chain/spec/[beaconstate, forks, helpers],
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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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tShuffle = "Retrieve committee once using get_beacon_committee"
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tAttest = "Combine committee attestations"
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func jsonName(prefix, slot: auto): string =
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fmt"{prefix:04}-{shortLog(slot):08}.json"
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proc writeJson*(fn, v: auto) =
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var f: File
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defer: close(f)
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RestJson.saveFile(fn, v, pretty = true)
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cli do(slots = SLOTS_PER_EPOCH * 5,
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validators = SLOTS_PER_EPOCH * 400, # One per shard is minimum
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json_interval = SLOTS_PER_EPOCH,
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write_last_json = false,
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prefix: int = 0,
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attesterRatio {.desc: "ratio of validators that attest in each round"} = 0.82,
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validate = true):
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let
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flags = if validate: {} else: {skipBlsValidation}
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(state, _) = loadGenesis(validators, validate)
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genesisBlock = get_initial_beacon_block(state[])
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echo "Starting simulation..."
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var
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attestations = initTable[Slot, seq[Attestation]]()
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latest_block_root = withBlck(genesisBlock): blck.root
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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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signedBlock: ForkedSignedBeaconBlock
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cache = StateCache()
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proc maybeWrite(last: bool) =
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if write_last_json:
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if getStateField(state[], slot) mod json_interval.uint64 == 0:
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write(stdout, ":")
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else:
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write(stdout, ".")
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if last:
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withState(state[]): writeJson("state.json", state.data)
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else:
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withState(state[]):
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if state.data.slot mod json_interval.uint64 == 0:
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writeJson(jsonName(prefix, state.data.slot), state.data)
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write(stdout, ":")
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else:
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write(stdout, ".")
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# TODO doAssert against this up-front
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# indexed attestation: validator index beyond max validators per committee
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# len(indices) <= MAX_VALIDATORS_PER_COMMITTEE
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for i in 0..<slots:
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maybeWrite(false)
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verifyConsensus(state[].phase0Data.data, attesterRatio)
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let
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attestations_idx = getStateField(state[], slot)
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blockAttestations = attestations.getOrDefault(attestations_idx)
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attestations.del attestations_idx
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doAssert attestations.lenu64 <=
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SLOTS_PER_EPOCH + MIN_ATTESTATION_INCLUSION_DELAY
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let t =
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if (getStateField(state[], slot) > GENESIS_SLOT and
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(getStateField(state[], slot) + 1).isEpoch): tEpoch
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else: tBlock
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withTimer(timers[t]):
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signedBlock = addTestBlock(
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state[], latest_block_root, cache, attestations = blockAttestations,
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flags = flags)
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latest_block_root = withTimerRet(timers[tHashBlock]):
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withBlck(signedBlock): hash_tree_root(blck.message)
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if attesterRatio > 0.0:
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# attesterRatio is the fraction of attesters that actually do their
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# work for every slot - we'll randomize it deterministically to give
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# some variation
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let
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target_slot = getStateField(state[], slot) + MIN_ATTESTATION_INCLUSION_DELAY - 1
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committees_per_slot =
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get_committee_count_per_slot(state[], target_slot.epoch, cache)
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let
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scass = withTimerRet(timers[tShuffle]):
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mapIt(
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0 ..< committees_per_slot.int,
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get_beacon_committee(state[], target_slot, it.CommitteeIndex, cache))
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for i, scas in scass:
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var
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attestation: Attestation
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first = true
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attesters.push scas.len()
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withTimer(timers[tAttest]):
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var agg {.noInit.}: AggregateSignature
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for v in scas:
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if (rand(r, high(int)).float * attesterRatio).int <= high(int):
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if first:
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attestation =
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makeAttestation(state[], latest_block_root, scas, target_slot,
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i.CommitteeIndex, v, cache, flags)
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agg.init(attestation.signature.load.get())
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first = false
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else:
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let att2 =
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makeAttestation(state[], latest_block_root, scas, target_slot,
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i.CommitteeIndex, v, cache, flags)
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if not att2.aggregation_bits.overlaps(attestation.aggregation_bits):
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attestation.aggregation_bits.incl(att2.aggregation_bits)
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if skipBlsValidation notin flags:
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agg.aggregate(att2.signature.load.get())
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attestation.signature = agg.finish().toValidatorSig()
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if not first:
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# add the attestation if any of the validators attested, as given
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# by the randomness. We have to delay when the attestation is
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# actually added to the block per the attestation delay rule!
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let target_slot =
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attestation.data.slot + MIN_ATTESTATION_INCLUSION_DELAY - 1
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doAssert target_slot > attestations_idx
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var target_slot_attestations =
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getOrDefault(attestations, target_slot)
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target_slot_attestations.add attestation
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attestations[target_slot] = target_slot_attestations
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flushFile(stdout)
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if getStateField(state[], slot).isEpoch:
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echo &" slot: {shortLog(getStateField(state[], slot))} ",
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&"epoch: {shortLog(state[].get_current_epoch())}"
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maybeWrite(true) # catch that last state as well..
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echo "Done!"
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printTimers(state[], attesters, validate, timers)
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