mirror of
https://github.com/status-im/nimbus-eth2.git
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2e9fa87f8b
The initialization of a `SyncAggregate` to its default value is not very intuitive. There is an `init` function in `sync_committee_msg_pool` that provides a convenience wrapper. This patch exports that initializer so that the rest of the code base can also take advantage of it.
315 lines
11 KiB
Nim
315 lines
11 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2021 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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import
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chronicles,
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options, stew/endians2,
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../beacon_chain/[beacon_node_types],
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../beacon_chain/validators/validator_pool,
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../beacon_chain/spec/datatypes/merge,
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../beacon_chain/spec/[helpers, signatures, state_transition, forks],
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../beacon_chain/consensus_object_pools/attestation_pool
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func makeFakeValidatorPrivKey*(i: int): 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.
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# TODO: switch to https://github.com/ethereum/eth2.0-pm/issues/60
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var bytes = uint64(i + 1000).toBytesLE()
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copyMem(addr result, addr bytes[0], sizeof(bytes))
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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 hackPrivKey*(v: Validator): ValidatorPrivKey =
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## Extract private key, per above hack
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var bytes: array[8, byte]
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static: doAssert sizeof(bytes) <= sizeof(v.withdrawal_credentials.data)
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copyMem(
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addr bytes, unsafeAddr v.withdrawal_credentials.data[0], sizeof(bytes))
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let i = int(uint64.fromBytesLE(bytes))
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makeFakeValidatorPrivKey(i)
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func makeDeposit*(i: int, flags: UpdateFlags = {}, cfg = defaultRuntimeConfig): DepositData =
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## Ugly hack for now: we stick the private key in withdrawal_credentials
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## which means we can repro private key and randao reveal from this data,
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## for testing :)
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let
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privkey = makeFakeValidatorPrivKey(i)
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pubkey = privkey.toPubKey()
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withdrawal_credentials = makeFakeHash(i)
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result = DepositData(
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pubkey: pubkey.toPubKey(),
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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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parent_root: Eth2Digest,
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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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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 rewards: RewardInfo
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doAssert process_slots(
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cfg, state, getStateField(state, slot) + 1, cache, rewards, flags)
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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 = hackPrivKey(getStateField(state, validators)[proposer_index.get])
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randao_reveal =
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if skipBlsValidation notin flags:
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privKey.genRandaoReveal(
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getStateField(state, fork),
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getStateField(state, genesis_validators_root),
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getStateField(state, slot)).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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parent_root,
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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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@[],
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@[],
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@[],
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SyncAggregate.init(),
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default(ExecutionPayload),
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noRollback,
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cache)
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doAssert message.isOk(), "Should have created a valid block!"
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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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parent_root: Eth2Digest,
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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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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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var tmpState = assignClone(state)
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addTestBlock(
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tmpState[], parent_root, cache, eth1_data, attestations, deposits,
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graffiti, cfg = cfg)
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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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let
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current_epoch = get_current_epoch(state)
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start_slot = compute_start_slot_at_epoch(current_epoch)
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epoch_boundary_block_root =
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if start_slot == getStateField(state, slot): beacon_block_root
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else: get_block_root_at_slot(state, start_slot)
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doAssert slot.compute_epoch_at_slot == current_epoch,
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"Computed epoch was " & $slot.compute_epoch_at_slot &
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" while the state current_epoch was " & $current_epoch
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# https://github.com/ethereum/consensus-specs/blob/v1.0.1/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: getStateField(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 makeAttestation*(
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state: ForkedHashedBeaconState, beacon_block_root: Eth2Digest,
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committee: seq[ValidatorIndex], slot: Slot, 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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# montonoic 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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validator = getStateField(state, validators)[validator_index]
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sac_index = committee.find(validator_index)
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data = makeAttestationData(state, slot, index, beacon_block_root)
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doAssert sac_index != -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 sac_index
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let
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sig =
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if skipBLSValidation notin flags:
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get_attestation_signature(
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getStateField(state, fork),
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getStateField(state, genesis_validators_root),
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data, hackPrivKey(validator)).toValidatorSig()
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else:
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ValidatorSig()
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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 = compute_epoch_at_slot(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.compute_start_slot_at_epoch.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 =
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get_committee_count_per_slot(state, slot.epoch, cache)
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for index in 0'u64..<committees_per_slot:
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let
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committee = get_beacon_committee(
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state, slot, index.CommitteeIndex, cache)
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data = makeAttestationData(
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state, slot, index.CommitteeIndex, beacon_block_root)
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doAssert committee.len() >= 1
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# Initial attestation
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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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var agg {.noInit.}: AggregateSignature
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agg.init(get_attestation_signature(
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getStateField(state, fork),
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getStateField(state, genesis_validators_root), data,
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hackPrivKey(getStateField(state, validators)[committee[0]])))
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# Aggregate the remainder
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attestation.aggregation_bits.setBit 0
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for j in 1 ..< committee.len():
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attestation.aggregation_bits.setBit j
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if skipBLSValidation notin flags:
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agg.aggregate(get_attestation_signature(
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getStateField(state, fork),
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getStateField(state, genesis_validators_root), data,
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hackPrivKey(getStateField(state, validators)[committee[j]])
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))
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attestation.signature = agg.finish().toValidatorSig()
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result.add attestation
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iterator makeTestBlocks*(
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state: ForkedHashedBeaconState,
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parent_root: Eth2Digest,
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cache: var StateCache,
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blocks: int,
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attested: bool,
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cfg = defaultRuntimeConfig): ForkedSignedBeaconBlock =
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var
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state = assignClone(state)[]
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parent_root = parent_root
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for _ in 0..<blocks:
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let attestations = if attested:
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makeFullAttestations(state, parent_root, getStateField(state, slot), cache)
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else:
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@[]
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let blck = addTestBlock(
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state, parent_root, cache, attestations = attestations, cfg = cfg)
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yield blck
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parent_root = blck.root
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proc getAttestationsForTestBlock*(
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pool: var AttestationPool, stateData: StateData, cache: var StateCache):
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seq[Attestation] =
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case stateData.data.beaconStateFork:
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of forkPhase0: pool.getAttestationsForBlock(stateData.data.hbsPhase0, cache)
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of forkAltair: pool.getAttestationsForBlock(stateData.data.hbsAltair, cache)
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of forkMerge: pool.getAttestationsForBlock(stateData.data.hbsMerge, cache)
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