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Abstracted (Kate commitment, length) into separate object

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vbuterin 2020-12-10 14:42:43 +08:00 committed by protolambda
parent 3d108e7fe2
commit ed357b9f9f
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1 changed files with 20 additions and 14 deletions
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34
specs/phase1/beacon-chain.md
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@ -108,7 +108,7 @@ class BeaconBlock(phase0.BeaconBlock):
class BeaconState(phase0.BeaconState):
current_epoch_pending_headers: List[PendingHeader, MAX_PENDING_HEADERS * SLOTS_PER_EPOCH]
previous_epoch_pending_headers: List[PendingHeader, MAX_PENDING_HEADERS * SLOTS_PER_EPOCH]
two_epochs_ago_confirmed_headers: Vector[Vector[PendingShardHeader, SLOTS_PER_EPOCH], MAX_SHARDS]
most_recent_confirmed_commitments: Vector[Vector[DataCommitment, SLOTS_PER_EPOCH], MAX_SHARDS]
shard_gasprice: uint64
current_epoch_start_shard: Shard
```
@ -117,6 +117,16 @@ class BeaconState(phase0.BeaconState):
The following containers are new in Phase 1.
### `DataCommitment`
```python
class DataCommitment(Container):
# Kate commitment to the data
point: BLSCommitment
# Length of the data in samples
length: length
```
### `ShardHeader`
```python
@ -124,10 +134,8 @@ class ShardHeader(Container):
# Slot and shard that this header is intended for
slot: Slot
shard: Shard
# Kate commitment to the data
commitment: BLSCommitment
# Length of the data in samples
length: uint64
# The actual data commitment
commitment: DataCommitment
# Proof of the length (more precisely, proof that values at
# positions >= the length all equal zero)
length_proof: BLSCommitment
@ -400,8 +408,8 @@ def process_shard_header(state: BeaconState,
)
# Verify length of the header
assert (
bls.Pairing(header.length_proof, SIZE_CHECK_POINTS[header.length]) ==
bls.Pairing(header.commitment, G2_ONE)
bls.Pairing(header.length_proof, SIZE_CHECK_POINTS[header.commitment.length]) ==
bls.Pairing(header.commitment.point, G2_ONE)
)
# Get the correct pending header list
if compute_epoch_at_slot(header.slot) == get_current_epoch(state):
@ -419,7 +427,6 @@ def process_shard_header(state: BeaconState,
shard=header.shard,
commitment=header.commitment,
root=header_root,
length=header.length,
votes=Bitlist[MAX_COMMITTEE_SIZE]([0] * committee_length),
confirmed=False
))
@ -499,10 +506,10 @@ def process_pending_headers(state: BeaconState):
candidates[winning_index].confirmed = True
for slot in range(SLOTS_PER_EPOCH):
for shard in range(SHARD_COUNT):
state.two_epochs_ago_confirmed_headers[shard][slot] = PendingHeader()
state.most_recent_confirmed_commitments[shard][slot] = DataCommitment()
for c in state.previous_epoch_pending_headers:
if c.confirmed:
state.two_epochs_ago_confirmed_headers[c.shard][c.slot % SLOTS_PER_EPOCH] = c
state.most_recent_confirmed_commitments[c.shard][c.slot % SLOTS_PER_EPOCH] = c.commitment
```
```python
@ -520,13 +527,13 @@ def charge_confirmed_header_fees(state: BeaconState) -> None:
# Charge EIP 1559 fee
proposer = get_shard_proposer(state, slot, shard)
fee = (
(state.shard_gasprice * candidates[i].length) //
(state.shard_gasprice * candidates[i].commitment.length) //
TARGET_SAMPLES_PER_BLOCK
)
decrease_balance(state, proposer, fee)
new_gasprice = compute_updated_gasprice(
new_gasprice,
candidates[i].length,
candidates[i].commitment.length,
adjustment_quotient
)
state.shard_gasprice = new_gasprice
@ -556,9 +563,8 @@ def reset_pending_headers(state: BeaconState):
state.current_epoch_pending_headers.append(PendingShardHeader(
slot=slot,
shard=shard,
commitment=BLSCommitment(),
commitment=DataCommitment(),
root=Root(),
length=0,
votes=Bitlist[MAX_COMMITTEE_SIZE]([0] * committee_length),
confirmed=False
))