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clean up commitee assignment typing

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Danny Ryan 2019-06-30 20:44:02 -05:00
parent 4f47e30144
commit f4907d67ee
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2 changed files with 5 additions and 7 deletions
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2
scripts/build_spec.py
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@ -11,7 +11,7 @@ from typing import (
PHASE0_IMPORTS = '''from typing import (
Any, Dict, Set, Sequence, Tuple,
Any, Dict, Set, Sequence, Tuple, Optional
)
from dataclasses import (

10
specs/validator/0_beacon-chain-validator.md
View File

@ -135,13 +135,14 @@ A validator can get committee assignments for a given epoch using the following
```python
def get_committee_assignment(state: BeaconState,
epoch: Epoch,
validator_index: ValidatorIndex) -> Tuple[Sequence[ValidatorIndex], Shard, Slot]:
validator_index: ValidatorIndex) -> Optional[Tuple[Sequence[ValidatorIndex], Shard, Slot]]:
"""
Return the committee assignment in the ``epoch`` for ``validator_index``.
``assignment`` returned is a tuple of the following form:
* ``assignment[0]`` is the list of validators in the committee
* ``assignment[1]`` is the shard to which the committee is assigned
* ``assignment[2]`` is the slot at which the committee is assigned
Return None if no assignment.
"""
next_epoch = get_current_epoch(state) + 1
assert epoch <= next_epoch
@ -155,11 +156,8 @@ def get_committee_assignment(state: BeaconState,
shard = Shard((slot_start_shard + i) % SHARD_COUNT)
committee = get_crosslink_committee(state, epoch, shard)
if validator_index in committee:
break
else:
continue
break
return committee, shard, Slot(slot)
return committee, shard, Slot(slot)
return None
```
A validator can use the following function to see if they are supposed to propose during their assigned committee slot. This function can only be run with a `state` of the slot in question. Proposer selection is only stable within the context of the current epoch.