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beacon-chain.md: add `unpack_compact_validator` for `light-client-sync.md`

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Hsiao-Wei Wang 2020-03-31 18:21:33 +08:00
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specs/phase1/beacon-chain.md
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@ -34,6 +34,7 @@
- [Misc](#misc-1)
- [`get_previous_slot`](#get_previous_slot)
- [`pack_compact_validator`](#pack_compact_validator)
- [`unpack_compact_validator`](#unpack_compact_validator)
- [`committee_to_compact_committee`](#committee_to_compact_committee)
- [`compute_shard_from_committee_index`](#compute_shard_from_committee_index)
- [Beacon state accessors](#beacon-state-accessors)
@ -371,15 +372,29 @@ def get_previous_slot(slot: Slot) -> Slot:
#### `pack_compact_validator`
```python
def pack_compact_validator(index: int, slashed: bool, balance_in_increments: int) -> int:
def pack_compact_validator(index: ValidatorIndex, slashed: bool, balance_in_increments: uint64) -> uint64:
"""
Creates a compact validator object representing index, slashed status, and compressed balance.
Create a compact validator object representing index, slashed status, and compressed balance.
Takes as input balance-in-increments (// EFFECTIVE_BALANCE_INCREMENT) to preserve symmetry with
the unpacking function.
"""
return (index << 16) + (slashed << 15) + balance_in_increments
```
#### `unpack_compact_validator`
```python
def unpack_compact_validator(compact_validator: uint64) -> Tuple[ValidatorIndex, bool, uint64]:
"""
Return validator index, slashed, balance // EFFECTIVE_BALANCE_INCREMENT
"""
return (
ValidatorIndex(compact_validator >> 16),
bool((compact_validator >> 15) % 2),
compact_validator & (2**15 - 1),
)
```
#### `committee_to_compact_committee`
```python