213 lines
7.0 KiB
Nim
213 lines
7.0 KiB
Nim
# beacon_chain
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# Copyright (c) 2019-2020 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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import
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confutils, stats, times, std/monotimes,
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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/[beaconstate, crypto, datatypes, digest, helpers, validator],
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../beacon_chain/[attestation_pool, extras, ssz]
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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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template withTimer(stats: var RunningStat, body: untyped) =
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let start = cpuTime()
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block:
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body
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let stop = cpuTime()
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stats.push stop - start
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template withTimerRet(stats: var RunningStat, body: untyped): untyped =
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let start = cpuTime()
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let tmp = block:
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body
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let stop = cpuTime()
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stats.push stop - start
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tmp
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proc 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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Json.saveFile(fn, v, pretty = true)
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func verifyConsensus(state: BeaconState, attesterRatio: auto) =
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if attesterRatio < 0.63:
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doAssert state.current_justified_checkpoint.epoch == 0
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doAssert state.finalized_checkpoint.epoch == 0
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# Quorum is 2/3 of validators, and at low numbers, quantization effects
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# can dominate, so allow for play above/below attesterRatio of 2/3.
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if attesterRatio < 0.72:
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return
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let current_epoch = get_current_epoch(state)
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if current_epoch >= 3:
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doAssert state.current_justified_checkpoint.epoch + 1 >= current_epoch
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if current_epoch >= 4:
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doAssert state.finalized_checkpoint.epoch + 2 >= current_epoch
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cli do(slots = SLOTS_PER_EPOCH * 6,
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validators = SLOTS_PER_EPOCH * 30, # 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 = 0,
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attesterRatio {.desc: "ratio of validators that attest in each round"} = 0.73,
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validate = true):
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echo "Preparing validators..."
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let
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# TODO should we include other skipXXXValidation flags here (e.g. StateRoot)?
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flags = if validate: {} else: {skipBlsValidation}
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deposits = makeInitialDeposits(validators, flags)
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echo "Generating Genesis..."
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let
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genesisState =
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initialize_beacon_state_from_eth1(
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Eth2Digest(), 0, deposits, flags + {skipMerkleValidation})
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genesisBlock = get_initial_beacon_block(genesisState)
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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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state = genesisState
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latest_block_root = hash_tree_root(genesisBlock.message)
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timers: array[Timers, RunningStat]
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attesters: RunningStat
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r: Rand
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signedBlock: SignedBeaconBlock
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cache = get_empty_per_epoch_cache()
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proc maybeWrite(last: bool) =
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if write_last_json:
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if 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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writeJson("state.json", state)
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else:
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if state.slot mod json_interval.uint64 == 0:
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writeJson(jsonName(prefix, state.slot), state)
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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, attesterRatio)
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let
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attestations_idx = state.slot
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blockAttestations = attestations.getOrDefault(attestations_idx)
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attestations.del attestations_idx
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doAssert len(attestations) <=
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(SLOTS_PER_EPOCH.int + MIN_ATTESTATION_INCLUSION_DELAY.int)
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let t =
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if (state.slot > GENESIS_SLOT and
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(state.slot + 1) mod SLOTS_PER_EPOCH == 0): 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, attestations = blockAttestations, flags = flags)
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latest_block_root = withTimerRet(timers[tHashBlock]):
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hash_tree_root(signedBlock.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 = state.slot + MIN_ATTESTATION_INCLUSION_DELAY - 1
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scass = withTimerRet(timers[tShuffle]):
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mapIt(
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0'u64 ..< get_committee_count_at_slot(state, target_slot),
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get_beacon_committee(state, target_slot, it, 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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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.uint64, v, cache, flags)
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first = false
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else:
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attestation.combine(
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makeAttestation(state, latest_block_root, scas, target_slot,
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i.uint64, v, cache, flags),
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flags)
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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 (state.slot) mod SLOTS_PER_EPOCH == 0:
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echo &" slot: {shortLog(state.slot)} ",
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&"epoch: {shortLog(state.slot.compute_epoch_at_slot)}"
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maybeWrite(true) # catch that last state as well..
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echo "Done!"
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echo "Validators: ", validators, ", epoch length: ", SLOTS_PER_EPOCH
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echo "Validators per attestation (mean): ", attesters.mean
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proc fmtTime(t: float): string = &"{t * 1000 :>12.3f}, "
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echo "All time are ms"
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echo &"{\"Average\" :>12}, {\"StdDev\" :>12}, {\"Min\" :>12}, " &
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&"{\"Max\" :>12}, {\"Samples\" :>12}, {\"Test\" :>12}"
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if not validate:
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echo "Validation is turned off meaning that no BLS operations are performed"
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for t in Timers:
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echo fmtTime(timers[t].mean), fmtTime(timers[t].standardDeviationS),
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fmtTime(timers[t].min), fmtTime(timers[t].max), &"{timers[t].n :>12}, ",
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$t
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