306 lines
11 KiB
Nim
306 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/validators/validator_pool,
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../beacon_chain/spec/datatypes/merge,
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../beacon_chain/spec/[helpers, keystore, signatures, state_transition, forks]
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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/v1.1.2/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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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 info = ForkedEpochInfo()
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doAssert process_slots(
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cfg, state, getStateField(state, slot) + 1, cache, info, 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 = MockPrivKeys[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, MockPrivKeys[validator_index]).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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MockPrivKeys[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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MockPrivKeys[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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