441 lines
15 KiB
Nim
441 lines
15 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2022 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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std/[options, random],
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chronicles,
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eth/keys,
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stew/endians2,
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../beacon_chain/consensus_object_pools/sync_committee_msg_pool,
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../beacon_chain/spec/datatypes/bellatrix,
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../beacon_chain/spec/[
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beaconstate, helpers, keystore, signatures, state_transition, validator]
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type
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MockPrivKeysT = object
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MockPubKeysT = object
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const
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MockPrivKeys* = MockPrivKeysT()
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MockPubKeys* = MockPubKeysT()
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# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/tests/core/pyspec/eth2spec/test/helpers/keys.py
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func `[]`*(_: MockPrivKeysT, index: ValidatorIndex): ValidatorPrivKey =
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# 0 is not a valid BLS private key - 1000 helps interop with rust BLS library,
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# lighthouse. EF tests use 1 instead of 1000.
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var bytes = (index.uint64 + 1000'u64).toBytesLE()
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static: doAssert sizeof(bytes) <= sizeof(result)
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copyMem(addr result, addr bytes, sizeof(bytes))
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func `[]`*(_: MockPubKeysT, index: ValidatorIndex): ValidatorPubKey =
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MockPrivKeys[index].toPubKey().toPubKey()
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func makeFakeHash*(i: int): Eth2Digest =
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var bytes = uint64(i).toBytesLE()
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static: doAssert sizeof(bytes) <= sizeof(result.data)
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copyMem(addr result.data[0], addr bytes[0], sizeof(bytes))
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func makeDeposit*(
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i: int,
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flags: UpdateFlags = {},
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cfg = defaultRuntimeConfig): DepositData =
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let
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privkey = MockPrivKeys[i.ValidatorIndex]
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pubkey = MockPubKeys[i.ValidatorIndex]
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withdrawal_credentials = makeWithdrawalCredentials(pubkey)
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result = DepositData(
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pubkey: pubkey,
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withdrawal_credentials: withdrawal_credentials,
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amount: MAX_EFFECTIVE_BALANCE)
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if skipBlsValidation notin flags:
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result.signature = get_deposit_signature(cfg, result, privkey).toValidatorSig()
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func makeInitialDeposits*(
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n = SLOTS_PER_EPOCH, flags: UpdateFlags = {}, cfg = defaultRuntimeConfig): seq[DepositData] =
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for i in 0..<n.int:
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result.add makeDeposit(i, flags, cfg = cfg)
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func signBlock(
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fork: Fork, genesis_validators_root: Eth2Digest, forked: ForkedBeaconBlock,
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privKey: ValidatorPrivKey, flags: UpdateFlags = {}): ForkedSignedBeaconBlock =
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let
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slot = withBlck(forked): blck.slot
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root = hash_tree_root(forked)
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signature =
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if skipBlsValidation notin flags:
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get_block_signature(
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fork, genesis_validators_root, slot, root, privKey).toValidatorSig()
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else:
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ValidatorSig()
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ForkedSignedBeaconBlock.init(forked, root, signature)
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proc addTestBlock*(
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state: var ForkedHashedBeaconState,
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cache: var StateCache,
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eth1_data = Eth1Data(),
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attestations = newSeq[Attestation](),
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deposits = newSeq[Deposit](),
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sync_aggregate = SyncAggregate.init(),
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graffiti = default(GraffitiBytes),
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flags: set[UpdateFlag] = {},
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nextSlot = true,
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cfg = defaultRuntimeConfig): ForkedSignedBeaconBlock =
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# Create and add a block to state - state will advance by one slot!
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if nextSlot:
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var info = ForkedEpochInfo()
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process_slots(
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cfg, state, getStateField(state, slot) + 1, cache, info, flags).expect(
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"can advance 1")
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let
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proposer_index = get_beacon_proposer_index(
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state, cache, getStateField(state, slot))
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privKey = MockPrivKeys[proposer_index.get]
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randao_reveal =
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if skipBlsValidation notin flags:
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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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getStateField(state, slot).epoch, privKey).toValidatorSig()
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else:
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ValidatorSig()
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let
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message = makeBeaconBlock(
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cfg,
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state,
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proposer_index.get(),
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randao_reveal,
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# Keep deposit counts internally consistent.
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Eth1Data(
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deposit_root: eth1_data.deposit_root,
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deposit_count: getStateField(state, eth1_deposit_index) + deposits.lenu64,
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block_hash: eth1_data.block_hash),
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graffiti,
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attestations,
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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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verificationFlags = {skipBlsValidation})
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if message.isErr:
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raiseAssert "Failed to create a block: " & $message.error
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let
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new_block = signBlock(
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getStateField(state, fork),
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getStateField(state, genesis_validators_root), message.get(), privKey,
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flags)
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new_block
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proc makeTestBlock*(
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state: ForkedHashedBeaconState,
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cache: var StateCache,
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eth1_data = Eth1Data(),
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attestations = newSeq[Attestation](),
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deposits = newSeq[Deposit](),
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sync_aggregate = SyncAggregate.init(),
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graffiti = default(GraffitiBytes),
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cfg = defaultRuntimeConfig): ForkedSignedBeaconBlock =
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# Create a block for `state.slot + 1` - like a block proposer would do!
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# It's a bit awkward - in order to produce a block for N+1, we need to
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# calculate what the state will look like after that block has been applied,
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# because the block includes the state root.
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let tmpState = assignClone(state)
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addTestBlock(
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tmpState[], cache, eth1_data,
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attestations, deposits, sync_aggregate, graffiti, cfg = cfg)
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func makeAttestationData*(
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state: ForkyBeaconState, slot: Slot, committee_index: CommitteeIndex,
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beacon_block_root: Eth2Digest): AttestationData =
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let
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current_epoch = get_current_epoch(state)
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start_slot = start_slot(current_epoch)
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epoch_boundary_block_root =
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if start_slot == state.slot: beacon_block_root
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else: get_block_root_at_slot(state, start_slot)
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doAssert slot.epoch == current_epoch,
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"Computed epoch was " & $slot.epoch &
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" while the state current_epoch was " & $current_epoch
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# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#attestation-data
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AttestationData(
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slot: slot,
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index: committee_index.uint64,
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beacon_block_root: beacon_block_root,
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source: state.current_justified_checkpoint,
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target: Checkpoint(
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epoch: current_epoch,
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root: epoch_boundary_block_root
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)
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)
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func makeAttestationSig*(
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fork: Fork, genesis_validators_root: Eth2Digest, data: AttestationData,
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committee: openArray[ValidatorIndex],
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bits: CommitteeValidatorsBits): ValidatorSig =
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let signing_root = compute_attestation_signing_root(
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fork, genesis_validators_root, data)
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var
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agg {.noinit.}: AggregateSignature
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first = true
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for i in 0..<bits.len():
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if not bits[i]: continue
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let sig = blsSign(MockPrivKeys[committee[i]], signing_root.data)
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if first:
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agg.init(sig)
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first = false
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else:
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agg.aggregate(sig)
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if first:
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ValidatorSig.infinity()
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else:
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agg.finish().toValidatorSig()
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func makeAttestationData*(
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state: ForkedHashedBeaconState, slot: Slot, committee_index: CommitteeIndex,
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beacon_block_root: Eth2Digest): AttestationData =
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## Create an attestation / vote for the block `beacon_block_root` using the
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## data in `state` to fill in the rest of the fields.
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## `state` is the state corresponding to the `beacon_block_root` advanced to
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## the slot we're attesting to.
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withState(state):
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makeAttestationData(state.data, slot, committee_index, beacon_block_root)
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func makeAttestation*(
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state: ForkedHashedBeaconState, beacon_block_root: Eth2Digest,
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committee: seq[ValidatorIndex], slot: Slot, committee_index: CommitteeIndex,
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validator_index: ValidatorIndex, cache: var StateCache,
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flags: UpdateFlags = {}): Attestation =
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# Avoids state_sim silliness; as it's responsible for all validators,
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# transforming, from monotonic enumerable index -> committee index ->
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# monotonic enumerable index, is wasteful and slow. Most test callers
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# want ValidatorIndex, so that's supported too.
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let
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index_in_committee = committee.find(validator_index)
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data = makeAttestationData(state, slot, committee_index, beacon_block_root)
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doAssert index_in_committee != -1, "find_beacon_committee should guarantee this"
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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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let sig = if skipBlsValidation in flags:
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ValidatorSig()
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else:
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makeAttestationSig(
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getStateField(state, fork),
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getStateField(state, genesis_validators_root),
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data, committee, aggregation_bits)
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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
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)
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func find_beacon_committee(
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state: ForkedHashedBeaconState, validator_index: ValidatorIndex,
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cache: var StateCache): auto =
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let epoch = epoch(getStateField(state, slot))
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for epoch_committee_index in 0'u64 ..< get_committee_count_per_slot(
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state, epoch, cache) * SLOTS_PER_EPOCH:
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let
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slot = ((epoch_committee_index mod SLOTS_PER_EPOCH) +
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epoch.start_slot.uint64).Slot
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index = CommitteeIndex(epoch_committee_index div SLOTS_PER_EPOCH)
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committee = get_beacon_committee(state, slot, index, cache)
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if validator_index in committee:
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return (committee, slot, index)
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doAssert false
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func makeAttestation*(
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state: ForkedHashedBeaconState, beacon_block_root: Eth2Digest,
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validator_index: ValidatorIndex, cache: var StateCache): Attestation =
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let (committee, slot, index) =
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find_beacon_committee(state, validator_index, cache)
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makeAttestation(state, beacon_block_root, committee, slot, index,
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validator_index, cache)
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func makeFullAttestations*(
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state: ForkedHashedBeaconState, beacon_block_root: Eth2Digest, slot: Slot,
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cache: var StateCache,
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flags: UpdateFlags = {}): seq[Attestation] =
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# Create attestations in which the full committee participates for each shard
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# that should be attested to during a particular slot
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let committees_per_slot = get_committee_count_per_slot(
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state, slot.epoch, cache)
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for committee_index in get_committee_indices(committees_per_slot):
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let
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committee = get_beacon_committee(state, slot, committee_index, cache)
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data = makeAttestationData(state, slot, committee_index, beacon_block_root)
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doAssert committee.len() >= 1
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var attestation = Attestation(
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aggregation_bits: CommitteeValidatorsBits.init(committee.len),
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data: data)
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for i in 0..<committee.len:
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attestation.aggregation_bits.setBit(i)
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attestation.signature = makeAttestationSig(
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getStateField(state, fork),
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getStateField(state, genesis_validators_root), data, committee,
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attestation.aggregation_bits)
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result.add attestation
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proc makeSyncAggregate(
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state: ForkedHashedBeaconState,
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syncCommitteeRatio: float,
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cfg: RuntimeConfig): SyncAggregate =
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if syncCommitteeRatio <= 0.0:
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return SyncAggregate.init()
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let
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syncCommittee =
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withState(state):
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when stateFork >= BeaconStateFork.Altair:
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if (state.data.slot + 1).is_sync_committee_period():
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state.data.next_sync_committee
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else:
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state.data.current_sync_committee
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else:
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return SyncAggregate.init()
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fork =
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getStateField(state, fork)
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genesis_validators_root =
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getStateField(state, genesis_validators_root)
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slot =
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getStateField(state, slot)
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latest_block_root =
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withState(state): state.latest_block_root
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syncCommitteePool = newClone(SyncCommitteeMsgPool.init(keys.newRng()))
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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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minActiveParticipants =
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if syncCommitteeRatio >= 2.0 / 3: # Ensure supermajority is hit
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(SYNC_COMMITTEE_SIZE * 2 + 2) div 3
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else:
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0
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maxActiveParticipants = (syncCommitteeRatio * SYNC_COMMITTEE_SIZE).int
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var
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aggregators: seq[Aggregator]
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numActiveParticipants = 0
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for subcommitteeIdx in SyncSubcommitteeIndex:
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let
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firstKeyIdx = subcommitteeIdx.int * SYNC_SUBCOMMITTEE_SIZE
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lastKeyIdx = firstKeyIdx + SYNC_SUBCOMMITTEE_SIZE - 1
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var processedKeys = initHashSet[ValidatorPubKey]()
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for idx, validatorKey in syncCommittee.pubkeys[firstKeyIdx .. lastKeyIdx]:
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if validatorKey in processedKeys:
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continue
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processedKeys.incl validatorKey
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let
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validatorIdx =
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block:
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var res = 0
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for i, validator in getStateField(state, validators):
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if validator.pubkey == validatorKey:
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res = i
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break
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res.ValidatorIndex
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selectionProofSig = get_sync_committee_selection_proof(
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fork, genesis_validators_root,
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slot, subcommitteeIdx,
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MockPrivKeys[validatorIdx])
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if is_sync_committee_aggregator(selectionProofSig.toValidatorSig):
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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.toValidatorSig)
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if numActiveParticipants >= minActiveParticipants and
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rand(1.0) > syncCommitteeRatio:
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continue
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var positions: seq[uint64]
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for pos, key in syncCommittee.pubkeys[firstKeyIdx + idx .. lastKeyIdx]:
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if numActiveParticipants >= maxActiveParticipants:
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break
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if key == validatorKey:
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positions.add (idx + pos).uint64
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inc numActiveParticipants
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if positions.len == 0:
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continue
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let signature = get_sync_committee_message_signature(
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fork, genesis_validators_root,
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slot, latest_block_root,
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MockPrivKeys[validatorIdx])
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syncCommitteePool[].addSyncCommitteeMessage(
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slot,
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latest_block_root,
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uint64 validatorIdx,
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signature,
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subcommitteeIdx,
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positions)
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for aggregator in aggregators:
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var contribution: SyncCommitteeContribution
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if syncCommitteePool[].produceContribution(
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slot, latest_block_root, aggregator.subcommitteeIdx, contribution):
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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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contributionSig = get_contribution_and_proof_signature(
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fork, genesis_validators_root,
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contributionAndProof,
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MockPrivKeys[aggregator.validatorIdx])
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signedContributionAndProof = SignedContributionAndProof(
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message: contributionAndProof,
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signature: contributionSig.toValidatorSig)
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discard syncCommitteePool[].addContribution(
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signedContributionAndProof, contribution.signature.load.get)
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syncCommitteePool[].produceSyncAggregate(latest_block_root)
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iterator makeTestBlocks*(
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state: ForkedHashedBeaconState,
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cache: var StateCache,
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blocks: int,
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attested: bool,
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syncCommitteeRatio = 0.0,
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cfg = defaultRuntimeConfig): ForkedSignedBeaconBlock =
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var
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state = assignClone(state)
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for _ in 0..<blocks:
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let
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parent_root = withState(state[]): state.latest_block_root
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attestations =
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if attested:
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makeFullAttestations(
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state[], parent_root, getStateField(state[], slot), cache)
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else:
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@[]
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sync_aggregate = makeSyncAggregate(state[], syncCommitteeRatio, cfg)
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yield addTestBlock(state[], cache,
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attestations = attestations, sync_aggregate = sync_aggregate, cfg = cfg)
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