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clean up casper slashing with helper functions etc

This commit is contained in:
Danny Ryan 2018-12-13 12:09:39 -06:00
parent be7217acc5
commit 7c833fafc5
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36
specs/core/0_beacon-chain.md
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@ -77,6 +77,8 @@
- [`get_domain`](#get_domain)
- [`hash_tree_root`](#hash_tree_root)
- [`verify_slashable_vote_data`](#verify_slashable_vote_data)
- [`is_double_vote`](#is_double_vote)
- [`is_surround_vote`](#is_surround_vote)
- [`integer_squareroot`](#integer_squareroot)
- [`bls_verify`](#bls_verify)
- [`bls_verify_multiple`](#bls_verify_multiple)
@ -1036,6 +1038,26 @@ def verify_slashable_vote_data(state: BeaconState, vote_data: SlashableVoteData)
)
```
#### `is_double_vote`
```python
def is_double_vote(attestation_data_1: AttestationData,
attestation_data_2: AttestationData) -> bool
return attestation_data_1.slot == attestation_data_2.slot
```
#### `is_surround_vote`
```python
def is_surround_vote(attestation_data_1: AttestationData,
attestation_data_2: AttestationData) -> bool
return (
(attestation_data_1.justified_slot < attestation_data_2.justified_slot) and
(attestat_data_2.justified_slot + 1 == attestation_data_2.slot) and
(attestation_data_2.slot < attestation_data_1.slot)
)
```
#### `integer_squareroot`
```python
@ -1389,13 +1411,15 @@ Verify that `len(block.body.casper_slashings) <= MAX_CASPER_SLASHINGS`.
For each `casper_slashing` in `block.body.casper_slashings`:
* Verify that `casper_slashing.slashable_vote_data_1.data != casper_slashing.slashable_vote_data_2.data`.
* Let `indices(vote) = vote.aggregate_signature_poc_0_indices + vote.aggregate_signature_poc_1_indices`.
* Let `intersection = [x for x in indices(casper_slashing.slashable_vote_data_1) if x in indices(casper_slashing.slashable_vote_data_2)]`.
* Let `slashable_vote_data_1 = casper_slashing.slashable_vote_data_1`.
* Let `slashable_vote_data_2 = casper_slashing.slashable_vote_data_2`.
* Let `indices(slashable_vote_data) = slashable_vote_data.aggregate_signature_poc_0_indices + slashable_vote_data.aggregate_signature_poc_1_indices`.
* Let `intersection = [x for x in indices(slashable_vote_data_1) if x in indices(slashable_vote_data_2)]`.
* Verify that `len(intersection) >= 1`.
* Verify that `casper_slashing.slashable_vote_data_1.data.justified_slot + 1 < casper_slashing.slashable_vote_data_2.data.justified_slot + 1 == casper_slashing.slashable_vote_data_2.data.slot < casper_slashing.slashable_vote_data_1.data.slot` or `casper_slashing.slashable_vote_data_1.data.slot == casper_slashing.slashable_vote_data_2.data.slot`.
* Verify that `verify_slashable_vote_data(state, casper_slashing.slashable_vote_data_1)`.
* Verify that `verify_slashable_vote_data(state, casper_slashing.slashable_vote_data_2)`.
* Verify that `slashable_vote_data_1.data != slashable_vote_data_2.data`.
* Verify that `is_double_vote(slashable_vote_data_1.data, slashable_vote_data_2.data)` or `is_surround_vote(slashable_vote_data_1.data, slashable_vote_data_2.data)`.
* Verify that `verify_slashable_vote_data(state, slashable_vote_data_1)`.
* Verify that `verify_slashable_vote_data(state, slashable_vote_data_2)`.
* For each [validator](#dfn-validator) index `i` in `intersection`, if `state.validator_registry[i].status` does not equal `EXITED_WITH_PENALTY`, then run `update_validator_status(state, i, new_status=EXITED_WITH_PENALTY)`
#### Attestations