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use helper for slots since epoch start

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Danny Ryan 2019-11-06 17:20:21 -07:00
parent fc40bff2a8
commit 09fd49ce89
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1 changed files with 10 additions and 1 deletions
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specs/core/0_fork-choice.md
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@ -96,11 +96,20 @@ def get_genesis_store(genesis_state: BeaconState) -> Store:
)
```
#### `get_current_slot`
```python
def get_current_slot(store: Store) -> Slot:
return Slot((store.time - store.genesis_time) // SECONDS_PER_SLOT)
```
#### `compute_slots_since_epoch_start`
```python
def compute_slots_since_epoch_start(slot: Slot) -> int:
return slot - compute_start_slot_at_epoch(compute_epoch_at_slot(slot))
```
#### `get_ancestor`
```python
@ -149,7 +158,7 @@ def get_head(store: Store) -> Hash:
```python
def should_update_justified_checkpoint(store: Store, new_justified_checkpoint: Checkpoint) -> bool:
if get_current_slot(store) % SLOTS_PER_EPOCH < SAFE_SLOTS_TO_UPDATE_JUSTIFIED:
if compute_slots_since_epoch_start(get_current_slot(store)) < SAFE_SLOTS_TO_UPDATE_JUSTIFIED:
return True
new_justified_block = store.blocks[new_justified_checkpoint.root]