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Merge branch 'dev' into fix-v-committee

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Danny Ryan 2019-05-17 10:31:57 -04:00
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2 changed files with 7 additions and 7 deletions
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12
specs/core/0_beacon-chain.md
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@ -647,7 +647,7 @@ def get_previous_epoch(state: BeaconState) -> Epoch:
Return the current epoch if it's genesis epoch.
"""
current_epoch = get_current_epoch(state)
return (current_epoch - 1) if current_epoch > GENESIS_EPOCH else current_epoch
return GENESIS_EPOCH if current_epoch == GENESIS_EPOCH else current_epoch - 1
```
### `get_current_epoch`
@ -887,7 +887,7 @@ def get_shuffled_index(index: ValidatorIndex, index_count: int, seed: Bytes32) -
# See the 'generalized domain' algorithm on page 3
for round in range(SHUFFLE_ROUND_COUNT):
pivot = bytes_to_int(hash(seed + int_to_bytes(round, length=1))[0:8]) % index_count
flip = (pivot - index) % index_count
flip = (pivot + index_count - index) % index_count
position = max(index, flip)
source = hash(seed + int_to_bytes(round, length=1) + int_to_bytes(position // 256, length=4))
byte = source[(position % 256) // 8]
@ -1362,19 +1362,19 @@ def process_justification_and_finalization(state: BeaconState) -> None:
# Process finalizations
bitfield = state.justification_bitfield
# The 2nd/3rd/4th most recent epochs are justified, the 2nd using the 4th as source
if (bitfield >> 1) % 8 == 0b111 and old_previous_justified_epoch == current_epoch - 3:
if (bitfield >> 1) % 8 == 0b111 and old_previous_justified_epoch + 3 == current_epoch:
state.finalized_epoch = old_previous_justified_epoch
state.finalized_root = get_block_root(state, state.finalized_epoch)
# The 2nd/3rd most recent epochs are justified, the 2nd using the 3rd as source
if (bitfield >> 1) % 4 == 0b11 and old_previous_justified_epoch == current_epoch - 2:
if (bitfield >> 1) % 4 == 0b11 and old_previous_justified_epoch + 2 == current_epoch:
state.finalized_epoch = old_previous_justified_epoch
state.finalized_root = get_block_root(state, state.finalized_epoch)
# The 1st/2nd/3rd most recent epochs are justified, the 1st using the 3rd as source
if (bitfield >> 0) % 8 == 0b111 and old_current_justified_epoch == current_epoch - 2:
if (bitfield >> 0) % 8 == 0b111 and old_current_justified_epoch + 2 == current_epoch:
state.finalized_epoch = old_current_justified_epoch
state.finalized_root = get_block_root(state, state.finalized_epoch)
# The 1st/2nd most recent epochs are justified, the 1st using the 2nd as source
if (bitfield >> 0) % 4 == 0b11 and old_current_justified_epoch == current_epoch - 1:
if (bitfield >> 0) % 4 == 0b11 and old_current_justified_epoch + 1 == current_epoch:
state.finalized_epoch = old_current_justified_epoch
state.finalized_root = get_block_root(state, state.finalized_epoch)
```

2
specs/validator/0_beacon-chain-validator.md
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@ -169,7 +169,7 @@ def is_proposer(state: BeaconState,
### Lookahead
The beacon chain shufflings are designed to provide a minimum of 1 epoch lookahead on the validator's upcoming committee assignments for attesting dictated by the shuffling and slot. Note that this lookahead does not apply to proposing, which must checked during the slot in question.
The beacon chain shufflings are designed to provide a minimum of 1 epoch lookahead on the validator's upcoming committee assignments for attesting dictated by the shuffling and slot. Note that this lookahead does not apply to proposing, which must be checked during the slot in question.
`get_committee_assignment` should be called at the start of each epoch to get the assignment for the next epoch (`current_epoch + 1`). A validator should plan for future assignments which involves noting at which future slot one will have to attest and also which shard one should begin syncing (in Phase 1+).