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For slow shard confirmation, assuming it is available via DAS, we could confirm the best pending header

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protolambda 2021-05-28 21:56:13 +02:00
parent 38a0f4f211
commit 72215412fa
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1 changed files with 18 additions and 6 deletions
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24
specs/sharding/beacon-chain.md
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@ -249,6 +249,8 @@ class PendingShardHeader(Container):
root: Root
# Who voted for the header
votes: Bitlist[MAX_VALIDATORS_PER_COMMITTEE]
# Sum of effective balances of votes
weight: Gwei
```
### `ShardBlobReference`
@ -552,15 +554,18 @@ def update_pending_votes(state: BeaconState, attestation: Attestation) -> None:
header_index = [header.root for header in current_headers].index(attestation.data.shard_header_root)
# Update votes bitfield in the state
pending_header: PendingShardHeader = state.shard_buffer[buffer_index][attestation_shard][header_index]
pending_header: PendingShardHeader = state.shard_buffer[buffer_index][attestation_shard][header_index]
full_committee = get_beacon_committee(state, attestation.data.slot, attestation.data.index)
participants_balance = Gwei(0)
for i, bit in enumerate(attestation.aggregation_bits):
weight = state.validators[full_committee[i]].effective_balance
if bit:
if not pending_header.votes[i]:
pending_header.weight += weight
pending_header.votes[i] = True
participants_balance += weight
# Check if the PendingShardHeader is eligible for expedited confirmation, requiring 2/3 of balance attesting
participants = get_attesting_indices(state, attestation.data, pending_header.votes)
participants_balance = get_total_balance(state, participants)
full_committee = get_beacon_committee(state, attestation.data.slot, attestation.data.index)
full_committee_balance = get_total_balance(state, set(full_committee))
if participants_balance * 3 >= full_committee_balance * 2:
if pending_header.commitment == DataCommitment():
@ -623,6 +628,7 @@ def process_shard_header(state: BeaconState, signed_header: SignedShardBlobHeade
commitment=body_summary.commitment,
root=header_root,
votes=initial_votes,
weight=0,
)
# Include it in the pending list
@ -706,8 +712,13 @@ def process_pending_headers(state: BeaconState) -> None:
for slot in range(previous_epoch_start_slot, previous_epoch_start_slot + SLOTS_PER_EPOCH):
buffer_index = slot % SHARD_STATE_MEMORY_SLOTS
for shard_index in range(len(state.shard_buffer[buffer_index])):
if state.shard_buffer[buffer_index][shard_index].selector == PENDING_SHARD_DATA:
state.shard_buffer[buffer_index][shard_index].change(selector=UNCONFIRMED_SHARD_DATA, value=None)
committee_work = state.shard_buffer[buffer_index][shard_index]
if committee_work.selector == PENDING_SHARD_DATA:
winning_header = max(committee_work.value, key=lambda header: header.weight)
if winning_header.commitment == DataCommitment():
committee_work.change(selector=UNCONFIRMED_SHARD_DATA, value=None)
else:
committee_work.change(selector=CONFIRMED_SHARD_DATA, value=winning_header.commitment)
```
```python
@ -769,6 +780,7 @@ def reset_pending_headers(state: BeaconState) -> None:
commitment=DataCommitment(),
root=Root(),
votes=Bitlist[MAX_VALIDATORS_PER_COMMITTEE]([0] * committee_length),
weight=0,
)
)
)