tersec
GitHub
commit
9d284b6eb4
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@ -1,7 +1,7 @@
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import
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os, net,
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asyncdispatch2, chronicles, confutils, eth_p2p, eth_keys,
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spec/[beaconstate, datatypes], conf, time, fork_choice,
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spec/[beaconstate, datatypes, helpers], conf, time, fork_choice,
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beacon_chain_db, validator_pool, mainchain_monitor,
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sync_protocol, gossipsub_protocol, trusted_state_snapshots
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@ -52,9 +52,9 @@ proc sync*(node: BeaconNode): Future[bool] {.async.} =
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node.beaconState = persistedState[]
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var targetSlot = toSlot timeSinceGenesis(node.beaconState)
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while node.beaconState.last_finalized_slot.int < targetSlot:
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while node.beaconState.finalized_slot.int < targetSlot:
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var (peer, changeLog) = await node.network.getValidatorChangeLog(
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node.beaconState.validator_set_delta_hash_chain)
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node.beaconState.validator_registry_delta_chain_tip)
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if peer == nil:
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error "Failed to sync with any peer"
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@ -79,7 +79,7 @@ proc addLocalValidators*(node: BeaconNode) =
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discard
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proc getAttachedValidator(node: BeaconNode, idx: int): AttachedValidator =
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let validatorKey = node.beaconState.validators[idx].pubkey
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let validatorKey = node.beaconState.validator_registry[idx].pubkey
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return node.attachedValidators.getValidator(validatorKey)
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proc makeAttestation(node: BeaconNode,
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@ -129,7 +129,7 @@ proc proposeBlock(node: BeaconNode,
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proc scheduleCycleActions(node: BeaconNode) =
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## This schedules the required block proposals and
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## attestations from our attached validators.
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let cycleStart = node.beaconState.last_state_recalculation_slot.int
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let cycleStart = node.beaconState.latest_state_recalculation_slot.int
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for i in 0 ..< EPOCH_LENGTH:
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# Schedule block proposals
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@ -148,7 +148,7 @@ proc scheduleCycleActions(node: BeaconNode) =
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# Schedule attestations
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let
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committeesIdx = get_shards_and_committees_index(node.beaconState, slot.uint64)
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committeesIdx = get_shard_and_committees_index(node.beaconState, slot.uint64)
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for shard in node.beaconState.shard_and_committee_for_slots[committees_idx]:
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for validatorIdx in shard.committee:
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@ -5,7 +5,7 @@ import
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type
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Attestation* = object
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validator*: int
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data*: AttestationSignedData
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data*: AttestationData
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signature*: ValidatorSig
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AttestationPool* = object
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@ -10,11 +10,8 @@ import
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../extras,
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./datatypes, ./digest, ./helpers, ./validator
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func mod_get[T](arr: openarray[T], pos: Natural): T =
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arr[pos mod arr.len]
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func on_startup*(initial_validator_entries: openArray[InitialValidator],
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genesis_time: int,
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genesis_time: uint64,
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processed_pow_receipt_root: Eth2Digest): BeaconState =
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## BeaconState constructor
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##
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@ -40,7 +37,7 @@ func on_startup*(initial_validator_entries: openArray[InitialValidator],
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ForkData(
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pre_fork_version: INITIAL_FORK_VERSION,
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post_fork_version: INITIAL_FORK_VERSION,
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fork_slot_number: 0xffffffffffffffff'u64
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fork_slot: INITIAL_SLOT_NUMBER
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),
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v.pubkey,
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v.deposit_size,
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@ -48,71 +45,65 @@ func on_startup*(initial_validator_entries: openArray[InitialValidator],
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v.withdrawal_credentials,
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v.randao_commitment,
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ACTIVE,
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0
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INITIAL_SLOT_NUMBER
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).validators
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# Setup state
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let
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x = get_new_shuffling(Eth2Digest(), validators, 0)
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initial_shuffling = get_new_shuffling(Eth2Digest(), validators, 0)
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# x + x in spec, but more ugly
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var tmp: array[2 * EPOCH_LENGTH, seq[ShardAndCommittee]]
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for i, n in x:
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tmp[i] = n
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tmp[EPOCH_LENGTH + i] = n
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# initial_shuffling + initial_shuffling in spec, but more ugly
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var shard_and_committee_for_slots: array[2 * EPOCH_LENGTH, seq[ShardAndCommittee]]
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for i, n in initial_shuffling:
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shard_and_committee_for_slots[i] = n
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shard_and_committee_for_slots[EPOCH_LENGTH + i] = n
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# The spec says to use validators, but it's actually indices..
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let validator_indices = get_active_validator_indices(validators)
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let persistent_committees = split(shuffle(
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validator_indices, ZERO_HASH), SHARD_COUNT)
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BeaconState(
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validators: validators,
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shard_and_committee_for_slots: tmp,
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persistent_committees: split(
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shuffle(validator_indices, Eth2Digest()), SHARD_COUNT),
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validator_registry: validators,
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validator_registry_latest_change_slot: INITIAL_SLOT_NUMBER,
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validator_registry_exit_count: 0,
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validator_registry_delta_chain_tip: ZERO_HASH,
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# Randomness and committees
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randao_mix: ZERO_HASH,
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next_seed: ZERO_HASH,
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shard_and_committee_for_slots: shard_and_committee_for_slots,
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persistent_committees: persistent_committees,
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# Finality
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previous_justified_slot: INITIAL_SLOT_NUMBER,
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justified_slot: INITIAL_SLOT_NUMBER,
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finalized_slot: INITIAL_SLOT_NUMBER,
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# Recent state
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latest_state_recalculation_slot: INITIAL_SLOT_NUMBER,
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latest_block_hashes: repeat(ZERO_HASH, EPOCH_LENGTH * 2),
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# PoW receipt root
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processed_pow_receipt_root: processed_pow_receipt_root,
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# Misc
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genesis_time: genesis_time,
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fork_data: ForkData(
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pre_fork_version: INITIAL_FORK_VERSION,
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post_fork_version: INITIAL_FORK_VERSION
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post_fork_version: INITIAL_FORK_VERSION,
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fork_slot: INITIAL_SLOT_NUMBER,
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),
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)
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)
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func get_shards_and_committees_index*(state: BeaconState, slot: uint64): uint64 =
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# TODO spec unsigned-unsafe here
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let earliest_slot_in_array =
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if state.last_state_recalculation_slot > EPOCH_LENGTH.uint64:
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state.last_state_recalculation_slot - EPOCH_LENGTH
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else:
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0
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doAssert earliest_slot_in_array <= slot and
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slot < earliest_slot_in_array + EPOCH_LENGTH * 2
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slot - earliest_slot_in_array
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proc get_shards_and_committees_for_slot*(
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state: BeaconState, slot: uint64): seq[ShardAndCommittee] =
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let index = state.get_shards_and_committees_index(slot)
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state.shard_and_committee_for_slots[index]
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func get_beacon_proposer_index*(state: BeaconState, slot: uint64): uint64 =
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## From Casper RPJ mini-spec:
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## When slot i begins, validator Vidx is expected
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## to create ("propose") a block, which contains a pointer to some parent block
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## that they perceive as the "head of the chain",
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## and includes all of the **attestations** that they know about
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## that have not yet been included into that chain.
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##
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## idx in Vidx == p(i mod N), pi being a random permutation of validators indices (i.e. a committee)
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let idx = get_shards_and_committees_index(state, slot)
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state.shard_and_committee_for_slots[idx][0].committee.mod_get(slot)
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func get_block_hash*(state: BeaconState,
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current_block: BeaconBlock,
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slot: int): Eth2Digest =
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slot: uint64): Eth2Digest =
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let earliest_slot_in_array =
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current_block.slot.int - state.recent_block_hashes.len
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assert earliest_slot_in_array <= slot
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assert slot < current_block.slot.int
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current_block.slot.int - state.latest_block_hashes.len
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assert earliest_slot_in_array <= slot.int
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assert slot < current_block.slot
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state.recent_block_hashes[slot - earliest_slot_in_array]
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state.latest_block_hashes[slot.int - earliest_slot_in_array]
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func append_to_recent_block_hashes*(old_block_hashes: seq[Eth2Digest],
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parent_slot, current_slot: uint64,
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@ -122,8 +113,8 @@ func append_to_recent_block_hashes*(old_block_hashes: seq[Eth2Digest],
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result.add repeat(parent_hash, d)
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proc get_attestation_participants*(state: BeaconState,
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attestation_data: AttestationSignedData,
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attester_bitfield: seq[byte]): seq[int] =
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attestation_data: AttestationData,
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participation_bitfield: seq[byte]): seq[int] =
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## Attestation participants in the attestation data are called out in a
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## bit field that corresponds to the committee of the shard at the time - this
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## function converts it to list of indices in to BeaconState.validators
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@ -132,7 +123,7 @@ proc get_attestation_participants*(state: BeaconState,
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# TODO bitfield type needed, once bit order settles down
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# TODO iterator candidate
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let
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sncs_for_slot = get_shards_and_committees_for_slot(
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sncs_for_slot = get_shard_and_committees_for_slot(
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state, attestation_data.slot)
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for snc in sncs_for_slot:
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@ -140,10 +131,10 @@ proc get_attestation_participants*(state: BeaconState,
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continue
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# TODO investigate functional library / approach to help avoid loop bugs
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assert len(attester_bitfield) == ceil_div8(len(snc.committee))
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assert len(participation_bitfield) == ceil_div8(len(snc.committee))
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for i, vindex in snc.committee:
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let
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bit = (attester_bitfield[i div 8] shr (7 - (i mod 8))) mod 2
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bit = (participation_bitfield[i div 8] shr (7 - (i mod 8))) mod 2
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if bit == 1:
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result.add(vindex)
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return # found the shard, we're done
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@ -37,9 +37,8 @@ const
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INITIAL_FORK_VERSION* = 0 #
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INITIAL_SLOT_NUMBER* = 0 #
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GWEI_PER_ETH* = 10^9 # Gwei/ETH
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ZERO_HASH* = Eth2Digest()
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BEACON_CHAIN_SHARD_NUMBER* = not 0'u64
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WITHDRAWALS_PER_CYCLE* = 2^2 # validators (5.2m ETH in ~6 months)
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MIN_WITHDRAWAL_PERIOD* = 2^13 # slots (~14 hours)
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# Time constants
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SLOT_DURATION* = 6 # seconds
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@ -82,18 +81,18 @@ type
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proposer_signature*: ValidatorSig # Proposer signature
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AttestationRecord* = object
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data*: AttestationSignedData #
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attester_bitfield*: seq[byte] # Attester participation bitfield
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poc_bitfield*: seq[byte] # Proof of custody bitfield
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data*: AttestationData
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participation_bitfield*: seq[byte] # Attester participation bitfield
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custody_bitfield*: seq[byte] # Proof of custody bitfield
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aggregate_sig*: ValidatorSig # BLS aggregate signature
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AttestationSignedData* = object
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AttestationData* = object
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slot*: uint64 # Slot number
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shard*: uint64 # Shard number
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block_hash*: Eth2Digest # Hash of the block we're signing
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cycle_boundary_hash*: Eth2Digest # Hash of the ancestor at the cycle boundary
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beacon_block_hash*: Eth2Digest # Hash of the block we're signing
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epoch_boundary_hash*: Eth2Digest # Hash of the ancestor at the cycle boundary
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shard_block_hash*: Eth2Digest # Shard block hash being attested to
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last_crosslink_hash*: Eth2Digest # Last crosslink hash
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latest_crosslink_hash*: Eth2Digest # Last crosslink hash
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justified_slot*: uint64 # Slot of last justified beacon block
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justified_block_hash*: Eth2Digest # Hash of last justified beacon block
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@ -107,31 +106,42 @@ type
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data*: seq[byte] # Data
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BeaconState* = object
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validator_set_change_slot*: uint64 # Slot of last validator set change
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validators*: seq[ValidatorRecord] # List of validators
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crosslinks*: array[SHARD_COUNT, CrosslinkRecord] # Most recent crosslink for each shard
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last_state_recalculation_slot*: uint64 # Last cycle-boundary state recalculation
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last_finalized_slot*: uint64 # Last finalized slot
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justification_source*: uint64 # Justification source
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prev_cycle_justification_source*: uint64 #
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justified_slot_bitfield*: uint64 # Recent justified slot bitmask
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# Validator registry
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validator_registry*: seq[ValidatorRecord]
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validator_registry_latest_change_slot*: uint64
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validator_registry_exit_count*: uint64
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validator_registry_delta_chain_tip*: Eth2Digest ##\
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## For light clients to easily track delta
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# Randomness and committees
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randao_mix*: Eth2Digest # RANDAO state
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next_seed*: Eth2Digest # Randao seed used for next shuffling
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shard_and_committee_for_slots*: array[2 * EPOCH_LENGTH, seq[ShardAndCommittee]] ## \
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## Committee members and their assigned shard, per slot, covers 2 cycles
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## worth of assignments
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persistent_committees*: seq[seq[Uint24]] # Persistent shard committees
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persistent_committee_reassignments*: seq[ShardReassignmentRecord]
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next_shuffling_seed*: Eth2Digest # Randao seed used for next shuffling
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deposits_penalized_in_period*: uint32 # Total deposits penalized in the given withdrawal period
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validator_set_delta_hash_chain*: Eth2Digest # Hash chain of validator set changes (for light clients to easily track deltas)
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current_exit_seq*: uint64 # Current sequence number for withdrawals
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genesis_time*: uint64 # Genesis time
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candidate_pow_receipt_root*: Eth2Digest # PoW receipt root
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candidate_pow_receipt_roots*: seq[CandidatePoWReceiptRootRecord] #
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fork_data*: ForkData # Parameters relevant to hard forks / versioning.
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# Should be updated only by hard forks.
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pending_attestations*: seq[ProcessedAttestation] # Attestations not yet processed
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recent_block_hashes*: seq[Eth2Digest] # recent beacon block hashes needed to process attestations, older to newer
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randao_mix*: Eth2Digest # RANDAO state
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# Finality
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previous_justified_slot*: uint64
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justified_slot*: uint64
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justified_slot_bitfield*: uint64
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finalized_slot*: uint64
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latest_crosslinks*: array[SHARD_COUNT, CrosslinkRecord]
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latest_state_recalculation_slot*: uint64
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latest_block_hashes*: seq[Eth2Digest] ##\
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## Needed to process attestations, older to newer
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latest_penalized_exit_balances*: seq[uint64] ##\
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## Balances penalized in the current withdrawal period
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latest_attestations*: seq[PendingAttestationRecord]
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processed_pow_receipt_root*: Eth2Digest
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candidate_pow_receipt_roots*: seq[CandidatePoWReceiptRootRecord]
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genesis_time*: uint64
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fork_data*: ForkData ##\
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## For versioning hard forks
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ValidatorRecord* = object
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pubkey*: ValidatorPubKey # Public key
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@ -140,12 +150,12 @@ type
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randao_skips*: uint64 # Slot the proposer has skipped (ie. layers of RANDAO expected)
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balance*: uint64 # Balance in Gwei
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status*: ValidatorStatusCodes # Status code
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last_status_change_slot*: uint64 # Slot when validator last changed status (or 0)
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exit_seq*: uint64 # Sequence number when validator exited (or 0)
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latest_status_change_slot*: uint64 # Slot when validator last changed status (or 0)
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exit_count*: uint64 # Exit counter when validator exited (or 0)
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CrosslinkRecord* = object
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slot*: uint64 # Slot number
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hash*: Eth2Digest # Shard chain block hash
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shard_block_hash*: Eth2Digest # Shard chain block hash
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ShardAndCommittee* = object
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shard*: uint64 # Shard number
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@ -163,12 +173,12 @@ type
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ForkData* = object
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pre_fork_version*: uint64 # Previous fork version
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post_fork_version*: uint64 # Post fork version
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fork_slot_number*: uint64 # Fork slot number
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fork_slot*: uint64 # Fork slot number
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ProcessedAttestation* = object
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data*: AttestationSignedData # Signed data
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attester_bitfield*: seq[byte] # Attester participation bitfield (2 bits per attester)
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poc_bitfield*: seq[byte] # Proof of custody bitfield
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PendingAttestationRecord* = object
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data*: AttestationData # Signed data
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participation_bitfield*: seq[byte] # Attester participation bitfield
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custody_bitfield*: seq[byte] # Proof of custody bitfield
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slot_included*: uint64 # Slot in which it was included
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ValidatorStatusCodes* {.pure.} = enum
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@ -9,6 +9,9 @@
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import ./datatypes, ./digest, sequtils, math
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func mod_get[T](arr: openarray[T], pos: Natural): T =
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arr[pos mod arr.len]
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|
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func shuffle*[T](values: seq[T], seed: Eth2Digest): seq[T] =
|
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## Returns the shuffled ``values`` with seed as entropy.
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## TODO: this calls out for tests, but I odn't particularly trust spec
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@ -83,3 +86,50 @@ func repeat_hash*(v: Eth2Digest, n: SomeInteger): Eth2Digest =
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v
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else:
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repeat_hash(eth2hash(v.data), n - 1)
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|
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func get_shard_and_committees_index*(state: BeaconState, slot: uint64): uint64 =
|
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# TODO spec unsigned-unsafe here
|
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let earliest_slot_in_array =
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if state.latest_state_recalculation_slot > EPOCH_LENGTH.uint64:
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state.latest_state_recalculation_slot - EPOCH_LENGTH
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else:
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0
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doAssert earliest_slot_in_array <= slot and
|
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slot < earliest_slot_in_array + EPOCH_LENGTH * 2
|
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slot - earliest_slot_in_array
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|
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proc get_shard_and_committees_for_slot*(
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state: BeaconState, slot: uint64): seq[ShardAndCommittee] =
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let index = state.get_shard_and_committees_index(slot)
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state.shard_and_committee_for_slots[index]
|
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|
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func get_beacon_proposer_index*(state: BeaconState, slot: uint64): uint64 =
|
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## From Casper RPJ mini-spec:
|
||||
## When slot i begins, validator Vidx is expected
|
||||
## to create ("propose") a block, which contains a pointer to some parent block
|
||||
## that they perceive as the "head of the chain",
|
||||
## and includes all of the **attestations** that they know about
|
||||
## that have not yet been included into that chain.
|
||||
##
|
||||
## idx in Vidx == p(i mod N), pi being a random permutation of validators indices (i.e. a committee)
|
||||
|
||||
let idx = get_shard_and_committees_index(state, slot)
|
||||
state.shard_and_committee_for_slots[idx][0].committee.mod_get(slot)
|
||||
|
||||
func int_sqrt*(n: SomeInteger): SomeInteger =
|
||||
var
|
||||
x = n
|
||||
y = (x + 1) div 2
|
||||
while y < x:
|
||||
x = y
|
||||
y = (x + n div x) div 2
|
||||
x
|
||||
|
||||
func get_fork_version*(fork_data: ForkData, slot: uint64): uint64 =
|
||||
if slot < fork_data.fork_slot: fork_data.pre_fork_version
|
||||
else: fork_data.post_fork_version
|
||||
|
||||
func get_domain*(fork_data: ForkData, slot: uint64, domain_type: uint64): uint64 =
|
||||
# TODO Slot overflow? Or is slot 32 bits for all intents and purposes?
|
||||
(get_fork_version(fork_data, slot) shl 32) + domain_type
|
||||
|
|
|
|||
|
|
@ -7,13 +7,15 @@
|
|||
# Helpers and functions pertaining to managing the validator set
|
||||
|
||||
import
|
||||
options,
|
||||
options, nimcrypto,
|
||||
eth_common,
|
||||
../ssz,
|
||||
./crypto, ./datatypes, ./digest, ./helpers
|
||||
|
||||
func min_empty_validator_index(validators: seq[ValidatorRecord], current_slot: uint64): Option[int] =
|
||||
for i, v in validators:
|
||||
if v.balance == 0 and v.last_status_change_slot + DELETION_PERIOD.uint64 <= current_slot:
|
||||
if v.balance == 0 and
|
||||
v.latest_status_change_slot + DELETION_PERIOD.uint64 <= current_slot:
|
||||
return some(i)
|
||||
|
||||
func get_new_validators*(current_validators: seq[ValidatorRecord],
|
||||
|
|
@ -59,8 +61,8 @@ func get_new_validators*(current_validators: seq[ValidatorRecord],
|
|||
randao_skips: 0,
|
||||
balance: deposit,
|
||||
status: status,
|
||||
last_status_change_slot: current_slot,
|
||||
exit_seq: 0
|
||||
latest_status_change_slot: current_slot,
|
||||
exit_count: 0
|
||||
)
|
||||
|
||||
let index = min_empty_validator_index(new_validators, current_slot)
|
||||
|
|
@ -74,7 +76,7 @@ func get_new_validators*(current_validators: seq[ValidatorRecord],
|
|||
func get_active_validator_indices*(validators: openArray[ValidatorRecord]): seq[Uint24] =
|
||||
## Select the active validators
|
||||
for idx, val in validators:
|
||||
if val.status == ACTIVE or val.status == PENDING_EXIT:
|
||||
if val.status in {ACTIVE, PENDING_EXIT}:
|
||||
result.add idx.Uint24
|
||||
|
||||
func get_new_shuffling*(seed: Eth2Digest,
|
||||
|
|
@ -109,3 +111,65 @@ func get_new_shuffling*(seed: Eth2Digest,
|
|||
committees[shard_position].committee = indices
|
||||
|
||||
result[slot] = committees
|
||||
|
||||
func get_new_validator_registry_delta_chain_tip(
|
||||
current_validator_registry_delta_chain_tip: Eth2Digest,
|
||||
index: Uint24,
|
||||
pubkey: ValidatorPubKey,
|
||||
flag: ValidatorSetDeltaFlags): Eth2Digest =
|
||||
## Compute the next hash in the validator registry delta hash chain.
|
||||
|
||||
withEth2Hash:
|
||||
h.update hashSSZ(current_validator_registry_delta_chain_tip)
|
||||
h.update hashSSZ(flag.uint8)
|
||||
h.update hashSSZ(index)
|
||||
# TODO h.update hashSSZ(pubkey)
|
||||
|
||||
func get_effective_balance*(validator: ValidatorRecord): uint64 =
|
||||
min(validator.balance, MAX_DEPOSIT.uint64)
|
||||
|
||||
func exit_validator*(index: Uint24,
|
||||
state: var BeaconState,
|
||||
penalize: bool,
|
||||
current_slot: uint64) =
|
||||
## Remove the validator with the given `index` from `state`.
|
||||
## Note that this function mutates `state`.
|
||||
|
||||
state.validator_registry_exit_count.inc()
|
||||
|
||||
var
|
||||
validator = state.validator_registry[index]
|
||||
|
||||
validator.latest_status_change_slot = current_slot
|
||||
validator.exit_count = state.validator_registry_exit_count
|
||||
|
||||
# Remove validator from persistent committees
|
||||
for committee in state.persistent_committees.mitems():
|
||||
for i, validator_index in committee:
|
||||
if validator_index == index:
|
||||
committee.delete(i)
|
||||
break
|
||||
|
||||
if penalize:
|
||||
validator.status = EXITED_WITH_PENALTY
|
||||
state.latest_penalized_exit_balances[
|
||||
(current_slot div COLLECTIVE_PENALTY_CALCULATION_PERIOD.uint64).int].inc(
|
||||
get_effective_balance(validator).int)
|
||||
|
||||
var
|
||||
whistleblower =
|
||||
state.validator_registry[get_beacon_proposer_index(state, current_slot).int]
|
||||
whistleblower_reward =
|
||||
validator.balance div WHISTLEBLOWER_REWARD_QUOTIENT.uint64
|
||||
whistleblower.balance.inc(whistleblower_reward.int)
|
||||
validator.balance.dec(whistleblower_reward.int)
|
||||
else:
|
||||
validator.status = PENDING_EXIT
|
||||
|
||||
state.validator_registry_delta_chain_tip =
|
||||
get_new_validator_registry_delta_chain_tip(
|
||||
state.validator_registry_delta_chain_tip,
|
||||
index,
|
||||
validator.pubkey,
|
||||
EXIT,
|
||||
)
|
||||
|
|
|
|||
|
|
@ -194,8 +194,8 @@ func hashSSZ*(x: ValidatorRecord): array[32, byte] =
|
|||
h.update hashSSZ(x.randao_skips)
|
||||
h.update hashSSZ(x.balance)
|
||||
# h.update hashSSZ(x.status) # TODO it's an enum, deal with it
|
||||
h.update hashSSZ(x.last_status_change_slot)
|
||||
h.update hashSSZ(x.exit_seq)
|
||||
h.update hashSSZ(x.latest_status_change_slot)
|
||||
h.update hashSSZ(x.exit_count)
|
||||
|
||||
func hashSSZ*(x: ShardAndCommittee): array[32, byte] =
|
||||
withHash:
|
||||
|
|
|
|||
|
|
@ -12,9 +12,9 @@
|
|||
# missing pieces - needs testing throughout
|
||||
|
||||
import
|
||||
options,
|
||||
math, options, sequtils,
|
||||
./extras,
|
||||
./spec/[beaconstate, crypto, datatypes, digest, helpers],
|
||||
./spec/[beaconstate, crypto, datatypes, digest, helpers, validator],
|
||||
./ssz,
|
||||
milagro_crypto # nimble install https://github.com/status-im/nim-milagro-crypto@#master
|
||||
|
||||
|
|
@ -24,30 +24,45 @@ import
|
|||
|
||||
func checkAttestations(state: BeaconState,
|
||||
blck: BeaconBlock,
|
||||
parent_slot: uint64): Option[seq[ProcessedAttestation]] =
|
||||
parent_slot: uint64): Option[seq[PendingAttestationRecord]] =
|
||||
# TODO perf improvement potential..
|
||||
if blck.attestations.len > MAX_ATTESTATIONS_PER_BLOCK:
|
||||
return
|
||||
|
||||
var res: seq[ProcessedAttestation]
|
||||
var res: seq[PendingAttestationRecord]
|
||||
for attestation in blck.attestations:
|
||||
if attestation.data.slot <= blck.slot - MIN_ATTESTATION_INCLUSION_DELAY:
|
||||
return
|
||||
if attestation.data.slot >= max(parent_slot - EPOCH_LENGTH + 1, 0):
|
||||
# TODO unsigned undeflow in spec
|
||||
if attestation.data.slot >= max(parent_slot.int - EPOCH_LENGTH + 1, 0).uint64:
|
||||
return
|
||||
|
||||
let expected_justified_slot =
|
||||
if attestation.data.slot >= state.latest_state_recalculation_slot:
|
||||
state.justified_slot
|
||||
else:
|
||||
state.previous_justified_slot
|
||||
if attestation.data.justified_slot != expected_justified_slot:
|
||||
return
|
||||
|
||||
let expected_justified_block_hash =
|
||||
get_block_hash(state, blck, attestation.data.justified_slot)
|
||||
if attestation.data.justified_block_hash != expected_justified_block_hash:
|
||||
return
|
||||
|
||||
if state.latest_crosslinks[attestation.data.shard].shard_block_hash notin [
|
||||
attestation.data.latest_crosslink_hash, attestation.data.shard_block_hash]:
|
||||
return
|
||||
#doAssert attestation.data.justified_slot == justification_source if attestation.data.slot >= state.last_state_recalculation_slot else prev_cycle_justification_source
|
||||
# doAssert attestation.data.justified_block_hash == get_block_hash(state, block, attestation.data.justified_slot).
|
||||
# doAssert either attestation.data.last_crosslink_hash or attestation.data.shard_block_hash equals state.crosslinks[shard].shard_block_hash.
|
||||
|
||||
let attestation_participants = get_attestation_participants(
|
||||
state, attestation.data, attestation.attester_bitfield)
|
||||
state, attestation.data, attestation.participation_bitfield)
|
||||
|
||||
var
|
||||
agg_pubkey: ValidatorPubKey
|
||||
empty = true
|
||||
|
||||
for attester_idx in attestation_participants:
|
||||
let validator = state.validators[attester_idx]
|
||||
let validator = state.validator_registry[attester_idx]
|
||||
if empty:
|
||||
agg_pubkey = validator.pubkey
|
||||
empty = false
|
||||
|
|
@ -62,10 +77,10 @@ func checkAttestations(state: BeaconState,
|
|||
debugEcho "Aggregate sig verify message: ",
|
||||
attestation.aggregate_sig.verifyMessage(msg, agg_pubkey)
|
||||
|
||||
res.add ProcessedAttestation(
|
||||
res.add PendingAttestationRecord(
|
||||
data: attestation.data,
|
||||
attester_bitfield: attestation.attester_bitfield,
|
||||
poc_bitfield: attestation.poc_bitfield,
|
||||
participation_bitfield: attestation.participation_bitfield,
|
||||
custody_bitfield: attestation.custody_bitfield,
|
||||
slot_included: blck.slot
|
||||
)
|
||||
|
||||
|
|
@ -84,7 +99,7 @@ func verifyProposerSignature(state: BeaconState, blck: BeaconBlock): bool =
|
|||
|
||||
verifyMessage(
|
||||
blck.proposer_signature, proposal_hash,
|
||||
state.validators[get_beacon_proposer_index(state, blck.slot).int].pubkey)
|
||||
state.validator_registry[get_beacon_proposer_index(state, blck.slot).int].pubkey)
|
||||
|
||||
func processRandaoReveal(state: var BeaconState,
|
||||
blck: BeaconBlock,
|
||||
|
|
@ -92,11 +107,11 @@ func processRandaoReveal(state: var BeaconState,
|
|||
# Update randao skips
|
||||
for slot in parentslot + 1 ..< blck.slot:
|
||||
let proposer_index = get_beacon_proposer_index(state, slot)
|
||||
state.validators[proposer_index.int].randao_skips.inc()
|
||||
state.validator_registry[proposer_index.int].randao_skips.inc()
|
||||
|
||||
var
|
||||
proposer_index = get_beacon_proposer_index(state, blck.slot)
|
||||
proposer = state.validators[proposer_index.int]
|
||||
proposer = state.validator_registry[proposer_index.int]
|
||||
|
||||
# Check that proposer commit and reveal match
|
||||
if repeat_hash(blck.randao_reveal, proposer.randao_skips + 1) !=
|
||||
|
|
@ -112,6 +127,22 @@ func processRandaoReveal(state: var BeaconState,
|
|||
|
||||
true
|
||||
|
||||
func processPoWReceiptRoot(state: var BeaconState, blck: BeaconBlock): bool =
|
||||
for x in state.candidate_pow_receipt_roots.mitems():
|
||||
if blck.candidate_pow_receipt_root == x.candidate_pow_receipt_root:
|
||||
x.votes.inc
|
||||
return true
|
||||
|
||||
state.candidate_pow_receipt_roots.add CandidatePoWReceiptRootRecord(
|
||||
candidate_pow_receipt_root: blck.candidate_pow_receipt_root,
|
||||
votes: 1
|
||||
)
|
||||
return true
|
||||
|
||||
func processSpecials(state: var BeaconState, blck: BeaconBlock): bool =
|
||||
# TODO incoming spec changes here..
|
||||
true
|
||||
|
||||
func process_block*(state: BeaconState, blck: BeaconBlock): Option[BeaconState] =
|
||||
## When a new block is received, all participants must verify that the block
|
||||
## makes sense and update their state accordingly. This function will return
|
||||
|
|
@ -127,15 +158,15 @@ func process_block*(state: BeaconState, blck: BeaconBlock): Option[BeaconState]
|
|||
# TODO actually get parent block, which means fixing up BeaconState refs above;
|
||||
# there's no distinction between active/crystallized state anymore, etc.
|
||||
|
||||
state.recent_block_hashes =
|
||||
append_to_recent_block_hashes(state.recent_block_hashes, parent_slot, slot,
|
||||
state.latest_block_hashes =
|
||||
append_to_recent_block_hashes(state.latest_block_hashes, parent_slot, slot,
|
||||
parent_hash)
|
||||
|
||||
let processed_attestations = checkAttestations(state, blck, parent_slot)
|
||||
if processed_attestations.isNone:
|
||||
return
|
||||
|
||||
state.pending_attestations.add processed_attestations.get()
|
||||
state.latest_attestations.add processed_attestations.get()
|
||||
|
||||
if not verifyProposerSignature(state, blck):
|
||||
return
|
||||
|
|
@ -143,4 +174,183 @@ func process_block*(state: BeaconState, blck: BeaconBlock): Option[BeaconState]
|
|||
if not processRandaoReveal(state, blck, parent_slot):
|
||||
return
|
||||
|
||||
if not processPoWReceiptRoot(state, blck):
|
||||
return
|
||||
|
||||
if not processSpecials(state, blck):
|
||||
return
|
||||
|
||||
some(state) # Looks ok - move on with the updated state
|
||||
|
||||
func flatten[T](v: openArray[seq[T]]): seq[T] =
|
||||
for x in v: result.add x
|
||||
|
||||
func get_epoch_boundary_attesters(
|
||||
state: BeaconState,
|
||||
attestations: openArray[PendingAttestationRecord]): seq[int] =
|
||||
deduplicate(flatten(mapIt(attestations,
|
||||
get_attestation_participants(state, it.data, it.participation_bitfield))))
|
||||
|
||||
func adjust_for_inclusion_distance[T](magnitude: T, dist: T): T =
|
||||
magnitude div 2 + (magnitude div 2) * MIN_ATTESTATION_INCLUSION_DELAY div dist
|
||||
|
||||
func processEpoch*(state: BeaconState, blck: BeaconBlock): Option[BeaconState] =
|
||||
## Epoch processing happens every time we've passed EPOCH_LENGTH blocks.
|
||||
## Because some slots may be skipped, it may happen that we go through the
|
||||
## loop more than once - each time the latest_state_recalculation_slot will be
|
||||
## increased by EPOCH_LENGTH.
|
||||
|
||||
# TODO: simplistic way to be able to rollback state
|
||||
var state = state
|
||||
|
||||
# Precomputation
|
||||
|
||||
while blck.slot >= EPOCH_LENGTH.uint64 + state.latest_state_recalculation_slot:
|
||||
let s = state.latest_state_recalculation_slot
|
||||
|
||||
let
|
||||
active_validators =
|
||||
mapIt(get_active_validator_indices(state.validator_registry),
|
||||
state.validator_registry[it])
|
||||
|
||||
total_balance = sum(mapIt(active_validators, get_effective_balance(it)))
|
||||
|
||||
total_balance_in_eth = total_balance.int div GWEI_PER_ETH
|
||||
|
||||
# The per-slot maximum interest rate is `2/reward_quotient`.)
|
||||
reward_quotient = BASE_REWARD_QUOTIENT * int_sqrt(total_balance_in_eth)
|
||||
|
||||
proc base_reward(v: ValidatorRecord): uint64 =
|
||||
get_effective_balance(v) div reward_quotient.uint64
|
||||
|
||||
# TODO doing this with iterators failed:
|
||||
# https://github.com/nim-lang/Nim/issues/9827
|
||||
let
|
||||
this_epoch_attestations = filterIt(state.latest_attestations,
|
||||
s <= it.data.slot and it.data.slot < s + EPOCH_LENGTH)
|
||||
|
||||
this_epoch_boundary_attestations = filterIt(this_epoch_attestations,
|
||||
it.data.epoch_boundary_hash == get_block_hash(state, blck, s) and
|
||||
it.data.justified_slot == state.justified_slot)
|
||||
|
||||
this_epoch_boundary_attesters =
|
||||
get_epoch_boundary_attesters(state, this_epoch_attestations)
|
||||
|
||||
this_epoch_boundary_attesting_balance = sum(
|
||||
mapIt(this_epoch_boundary_attesters,
|
||||
get_effective_balance(state.validator_registry[it]))
|
||||
)
|
||||
|
||||
let
|
||||
previous_epoch_attestations = filterIt(state.latest_attestations,
|
||||
s <= it.data.slot + EPOCH_LENGTH and it.data.slot < s)
|
||||
previous_epoch_boundary_attestations = filterIt(previous_epoch_attestations,
|
||||
it.data.epoch_boundary_hash == get_block_hash(state, blck, s) and
|
||||
it.data.justified_slot == state.justified_slot)
|
||||
previous_epoch_boundary_attesters =
|
||||
get_epoch_boundary_attesters(state, previous_epoch_boundary_attestations)
|
||||
previous_epoch_boundary_attesting_balance = sum(
|
||||
mapIt(previous_epoch_boundary_attesters,
|
||||
get_effective_balance(state.validator_registry[it]))
|
||||
)
|
||||
|
||||
# TODO gets pretty hairy here
|
||||
func attesting_validators(
|
||||
obj: ShardAndCommittee, shard_block_hash: Eth2Digest): seq[int] =
|
||||
flatten(
|
||||
mapIt(
|
||||
filterIt(concat(this_epoch_attestations, previous_epoch_attestations),
|
||||
it.data.shard == obj.shard and
|
||||
it.data.shard_block_hash == shard_block_hash),
|
||||
get_attestation_participants(state, it.data, it.participation_bitfield)))
|
||||
|
||||
# TODO which shard_block_hash:es?
|
||||
# * Let `attesting_validators(obj)` be equal to `attesting_validators(obj, shard_block_hash)` for the value of `shard_block_hash` such that `sum([get_effective_balance(v) for v in attesting_validators(obj, shard_block_hash)])` is maximized (ties broken by favoring lower `shard_block_hash` values).
|
||||
# * Let `total_attesting_balance(obj)` be the sum of the balances-at-stake of `attesting_validators(obj)`.
|
||||
# * Let `winning_hash(obj)` be the winning `shard_block_hash` value.
|
||||
# * Let `total_balance(obj) = sum([get_effective_balance(v) for v in obj.committee])`.
|
||||
|
||||
# Let `inclusion_slot(v)` equal `a.slot_included` for the attestation `a` where `v` is in `get_attestation_participants(state, a.data, a.participation_bitfield)`, and `inclusion_distance(v) = a.slot_included - a.data.slot` for the same attestation. We define a function `adjust_for_inclusion_distance(magnitude, distance)` which adjusts the reward of an attestation based on how long it took to get included (the longer, the lower the reward). Returns a value between 0 and `magnitude`.
|
||||
|
||||
# Adjust justified slots and crosslink status
|
||||
|
||||
var new_justified_slot: Option[uint64]
|
||||
# overflow intentional!
|
||||
state.justified_slot_bitfield = state.justified_slot_bitfield * 2
|
||||
|
||||
if 3'u64 * previous_epoch_boundary_attesting_balance >= 2'u64 * total_balance:
|
||||
# TODO spec says "flip the second lowest bit to 1" and does "AND", wrong?
|
||||
state.justified_slot_bitfield = state.justified_slot_bitfield or 2
|
||||
new_justified_slot = some(s - EPOCH_LENGTH)
|
||||
|
||||
if 3'u64 * this_epoch_boundary_attesting_balance >= 2'u64 * total_balance:
|
||||
# TODO spec says "flip the second lowest bit to 1" and does "AND", wrong?
|
||||
state.justified_slot_bitfield = state.justified_slot_bitfield or 1
|
||||
new_justified_slot = some(s)
|
||||
|
||||
if state.justified_slot == s - EPOCH_LENGTH and
|
||||
state.justified_slot_bitfield mod 4 == 3:
|
||||
state.finalized_slot = state.justified_slot
|
||||
if state.justified_slot == s - EPOCH_LENGTH - EPOCH_LENGTH and
|
||||
state.justified_slot_bitfield mod 8 == 7:
|
||||
state.finalized_slot = state.justified_slot
|
||||
|
||||
if state.justified_slot == s - EPOCH_LENGTH - 2 * EPOCH_LENGTH and
|
||||
state.justified_slot_bitfield mod 16 in [15'u64, 14]:
|
||||
state.finalized_slot = state.justified_slot
|
||||
|
||||
state.previous_justified_slot = state.justified_slot
|
||||
|
||||
if new_justified_slot.isSome():
|
||||
state.justified_slot = new_justified_slot.get()
|
||||
|
||||
# for obj in state.shard_and_committee_for_slots:
|
||||
# 3 * total_attesting_balance(obj) >= 2 * total_balance(obj):
|
||||
# state.crosslinks[shard] = CrosslinkRecord(
|
||||
# slot: latest_state_recalculation_slot + EPOCH_LENGTH,
|
||||
# hash: winning_hash(obj))
|
||||
|
||||
# Balance recalculations related to FFG rewards
|
||||
let
|
||||
# The portion lost by offline [validators](#dfn-validator) after `D`
|
||||
# epochs is about `D*D/2/inactivity_penalty_quotient`.
|
||||
inactivity_penalty_quotient = SQRT_E_DROP_TIME^2
|
||||
time_since_finality = blck.slot - state.finalized_slot
|
||||
|
||||
if time_since_finality <= 4'u64 * EPOCH_LENGTH:
|
||||
# for v in previous_epoch_boundary_attesters:
|
||||
# state.validators[v].balance.inc(adjust_for_inclusion_distance(
|
||||
# base_reward(state.validators[v]) *
|
||||
# prev_cycle_boundary_attesting_balance div total_balance,
|
||||
# inclusion_distance(v)))
|
||||
|
||||
for v in get_active_validator_indices(state.validator_registry):
|
||||
if v notin previous_epoch_boundary_attesters:
|
||||
state.validator_registry[v].balance.dec(
|
||||
base_reward(state.validator_registry[v]).int)
|
||||
else:
|
||||
# Any validator in `prev_cycle_boundary_attesters` sees their balance
|
||||
# unchanged.
|
||||
# Others might get penalized:
|
||||
for vindex, v in state.validator_registry.mpairs():
|
||||
if (v.status == ACTIVE and vindex notin previous_epoch_boundary_attesters) or
|
||||
v.status == EXITED_WITH_PENALTY:
|
||||
v.balance.dec(
|
||||
(base_reward(v) + get_effective_balance(v) * time_since_finality div
|
||||
inactivity_penalty_quotient.uint64).int)
|
||||
|
||||
# For each `v` in `prev_cycle_boundary_attesters`, we determine the proposer `proposer_index = get_beacon_proposer_index(state, inclusion_slot(v))` and set `state.validators[proposer_index].balance += base_reward(v) // INCLUDER_REWARD_SHARE_QUOTIENT`.
|
||||
|
||||
# Balance recalculations related to crosslink rewards
|
||||
|
||||
# Ethereum 1.0 chain related rules
|
||||
|
||||
# Validator registry change
|
||||
|
||||
# If a validator registry change does NOT happen
|
||||
|
||||
# Proposer reshuffling
|
||||
|
||||
# Finally...
|
||||
|
||||
some(state)
|
||||
|
|
|
|||
|
|
@ -85,9 +85,9 @@ proc applyValidatorChangeLog*(log: ChangeLog,
|
|||
# 4. Apply all changes to the validator set
|
||||
#
|
||||
|
||||
outBeaconState.last_finalized_slot =
|
||||
outBeaconState.finalized_slot =
|
||||
log.signedBlock.slot div EPOCH_LENGTH
|
||||
|
||||
outBeaconState.validator_set_delta_hash_chain =
|
||||
log.beaconState.validator_set_delta_hash_chain
|
||||
outBeaconState.validator_registry_delta_chain_tip =
|
||||
log.beaconState.validator_registry_delta_chain_tip
|
||||
|
||||
|
|
|
|||
|
|
@ -35,7 +35,7 @@ proc randomTimeInSlot*(s: BeaconState,
|
|||
|
||||
proc slotDistanceFromNow*(s: BeaconState): int64 =
|
||||
## Returns how many slots have passed since a particular BeaconState was finalized
|
||||
int64(s.timeSinceGenesis() div (SLOT_DURATION * 1000)) - int64(s.last_finalized_slot)
|
||||
int64(s.timeSinceGenesis() div (SLOT_DURATION * 1000)) - int64(s.finalized_slot)
|
||||
|
||||
proc syncrhronizeClock*() {.async.} =
|
||||
## This should determine the offset of the local clock against a global
|
||||
|
|
|
|||
|
|
@ -53,7 +53,7 @@ proc signBlockProposal*(v: AttachedValidator,
|
|||
discard
|
||||
|
||||
proc signAttestation*(v: AttachedValidator,
|
||||
attestation: AttestationSignedData): Future[ValidatorSig] {.async.} =
|
||||
attestation: AttestationData): Future[ValidatorSig] {.async.} =
|
||||
# TODO: implement this
|
||||
if v.kind == inProcess:
|
||||
await sleepAsync(1)
|
||||
|
|
|
|||
|
|
@ -16,4 +16,4 @@ suite "Beacon state":
|
|||
|
||||
test "Smoke on_startup":
|
||||
let state = on_startup(makeInitialValidators(EPOCH_LENGTH), 0, Eth2Digest())
|
||||
check: state.validators.len == EPOCH_LENGTH
|
||||
check: state.validator_registry.len == EPOCH_LENGTH
|
||||
|
|
|
|||
Loading…
Reference in New Issue