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Revert exception handling

This commit is contained in:
Justin Drake 2019-05-08 19:15:23 +01:00
parent 9eeca0cdbd
commit c37157ead1
1 changed files with 6 additions and 10 deletions
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16
specs/core/0_beacon-chain.md
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@ -1216,19 +1216,15 @@ Let `genesis_block = BeaconBlock(state_root=hash_tree_root(genesis_state))`.
## Beacon chain state transition function
The post-state corresponding to a pre-state `state` and a block `block` is defined as `state_transition(state, block)`.
The post-state corresponding to a pre-state `state` and a block `block` is defined as `state_transition(state, block)`. State transitions that trigger an unhandled excpetion (e.g. a failed `assert` or an out-of-range list access) are considered invalid.
```python
def state_transition(state: BeaconState, block: BeaconBlock) -> BeaconState:
pre_state = copy.deepcopy(state)
try:
# Process slots (including those with no blocks) since block
process_slots(state, block.slot)
# Process block
process_block(state, block)
except Exception:
# State is not advanced on exceptions (e.g. a failed `assert` or an out-of-range list access)
return pre_state
# Process slots (including those with no blocks) since block
process_slots(state, block.slot)
# Process block
process_block(state, block)
# Return post-state
return state
```