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Hsiao-Wei Wang 2019-04-18 16:53:02 +08:00
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specs/core/0_beacon-chain.md
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@ -126,7 +126,7 @@
- [Per-block processing](#per-block-processing) - [Per-block processing](#per-block-processing)
- [Block header](#block-header) - [Block header](#block-header)
- [RANDAO](#randao) - [RANDAO](#randao)
- [Eth1 data](#eth1-data-1) - [Eth1 data](#eth1-data)
- [Operations](#operations) - [Operations](#operations)
- [Proposer slashings](#proposer-slashings) - [Proposer slashings](#proposer-slashings)
- [Attester slashings](#attester-slashings) - [Attester slashings](#attester-slashings)
@ -1429,8 +1429,8 @@ def get_genesis_beacon_state(genesis_validator_deposits: List[Deposit],
finalized_root=ZERO_HASH, finalized_root=ZERO_HASH,
# Recent state # Recent state
current_crosslinks=Vector([Crosslink(epoch=GENESIS_EPOCH, crosslink_data_root=ZERO_HASH, previous_crosslink_root=ZERO_HASH) for _ in range(SHARD_COUNT)]), current_crosslinks=Vector([Crosslink(epoch=GENESIS_EPOCH, previous_crosslink_root=ZERO_HASH, crosslink_data_root=ZERO_HASH) for _ in range(SHARD_COUNT)]),
previous_crosslinks=Vector([Crosslink(epoch=GENESIS_EPOCH, crosslink_data_root=ZERO_HASH, previous_crosslink_root=ZERO_HASH) for _ in range(SHARD_COUNT)]), previous_crosslinks=Vector([Crosslink(epoch=GENESIS_EPOCH, previous_crosslink_root=ZERO_HASH, crosslink_data_root=ZERO_HASH) for _ in range(SHARD_COUNT)]),
latest_block_roots=Vector([ZERO_HASH for _ in range(SLOTS_PER_HISTORICAL_ROOT)]), latest_block_roots=Vector([ZERO_HASH for _ in range(SLOTS_PER_HISTORICAL_ROOT)]),
latest_state_roots=Vector([ZERO_HASH for _ in range(SLOTS_PER_HISTORICAL_ROOT)]), latest_state_roots=Vector([ZERO_HASH for _ in range(SLOTS_PER_HISTORICAL_ROOT)]),
latest_active_index_roots=Vector([ZERO_HASH for _ in range(LATEST_ACTIVE_INDEX_ROOTS_LENGTH)]), latest_active_index_roots=Vector([ZERO_HASH for _ in range(LATEST_ACTIVE_INDEX_ROOTS_LENGTH)]),
@ -1634,14 +1634,17 @@ def get_previous_epoch_matching_head_attestations(state: BeaconState) -> List[Pe
```python ```python
def get_winning_crosslink_and_attesting_indices(state: BeaconState, epoch: Epoch, shard: Shard) -> Tuple[Crosslink, List[ValidatorIndex]]: def get_winning_crosslink_and_attesting_indices(state: BeaconState, epoch: Epoch, shard: Shard) -> Tuple[Crosslink, List[ValidatorIndex]]:
pending_attestations = state.current_epoch_attestations if epoch == get_current_epoch(state) else state.previous_epoch_attestations pending_attestations = state.current_epoch_attestations if epoch == get_current_epoch(state) else state.previous_epoch_attestations
candidate_crosslinks = [Crosslink( candidate_crosslinks = [
Crosslink(
epoch=min(epoch, state.current_crosslinks[shard].epoch + MAX_CROSSLINK_EPOCHS), epoch=min(epoch, state.current_crosslinks[shard].epoch + MAX_CROSSLINK_EPOCHS),
crosslink_data_root=a.data.crosslink_data_root,
previous_crosslink_root=a.data.previous_crosslink_root, previous_crosslink_root=a.data.previous_crosslink_root,
) for a in pending_attestations if a.data.shard == shard] crosslink_data_root=a.data.crosslink_data_root,
)
for a in pending_attestations if a.data.shard == shard
]
if len(candidate_crosslinks) == 0: if len(candidate_crosslinks) == 0:
return Crosslink(epoch=GENESIS_EPOCH, crosslink_data_root=ZERO_HASH, previous_crosslink_root=ZERO_HASH), [] return Crosslink(epoch=GENESIS_EPOCH, previous_crosslink_root=ZERO_HASH, crosslink_data_root=ZERO_HASH), []
def get_attestations_for(crosslink_data_root) -> List[PendingAttestation]: def get_attestations_for(crosslink_data_root) -> List[PendingAttestation]:
return [a for a in pending_attestations if a.data.shard == shard and a.data.crosslink_data_root == crosslink_data_root] return [a for a in pending_attestations if a.data.shard == shard and a.data.crosslink_data_root == crosslink_data_root]
@ -1714,8 +1717,9 @@ Run the following function:
```python ```python
def process_crosslinks(state: BeaconState) -> None: def process_crosslinks(state: BeaconState) -> None:
state.previous_crosslinks = state.current_crosslinks state.previous_crosslinks = state.current_crosslinks
previous_epoch = get_previous_epoch(state)
for slot in range(get_epoch_start_slot(get_previous_epoch(state)), get_epoch_start_slot(get_current_epoch(state) + 1)): next_epoch = get_current_epoch(state) + 1
for slot in range(get_epoch_start_slot(previous_epoch), get_epoch_start_slot(next_epoch)):
for crosslink_committee, shard in get_crosslink_committees_at_slot(state, slot): for crosslink_committee, shard in get_crosslink_committees_at_slot(state, slot):
winning_crosslink, attesting_indices = get_winning_crosslink_and_attesting_indices(state, slot_to_epoch(slot), shard) winning_crosslink, attesting_indices = get_winning_crosslink_and_attesting_indices(state, slot_to_epoch(slot), shard)
attesting_balance = get_total_balance(state, attesting_indices) attesting_balance = get_total_balance(state, attesting_indices)
@ -1817,7 +1821,7 @@ def get_crosslink_deltas(state: BeaconState) -> Tuple[List[Gwei], List[Gwei]]:
winning_crosslink, attesting_indices = get_winning_crosslink_and_attesting_indices(state, slot_to_epoch(slot), shard) winning_crosslink, attesting_indices = get_winning_crosslink_and_attesting_indices(state, slot_to_epoch(slot), shard)
# Do not count as success if winning_crosslink did not or cannot form a chain # Do not count as success if winning_crosslink did not or cannot form a chain
if not hash_tree_root(state.previous_crosslinks[shard]) in ( if hash_tree_root(state.previous_crosslinks[shard]) not in (
winning_crosslink.previous_crosslink_root, winning_crosslink.previous_crosslink_root,
hash_tree_root(winning_crosslink) hash_tree_root(winning_crosslink)
): ):
@ -1881,7 +1885,7 @@ def update_registry(state: BeaconState) -> None:
], key=lambda index: state.validator_registry[index].activation_eligibility_epoch) ], key=lambda index: state.validator_registry[index].activation_eligibility_epoch)
for index in activation_queue[:get_churn_limit(state)]: for index in activation_queue[:get_churn_limit(state)]:
activate_validator(state, index, is_genesis=False) activate_validator(state, index)
state.latest_start_shard = ( state.latest_start_shard = (
state.latest_start_shard + state.latest_start_shard +