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remove s helper

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Danny Ryan 2018-12-06 16:38:40 -06:00
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specs/core/0_beacon-chain.md
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@ -1342,7 +1342,7 @@ process_deposit(
## Per-epoch processing ## Per-epoch processing
The steps below happen when `state.slot % EPOCH_LENGTH == 0`. For simplicity we denote `state.slot - EPOCH_LENGTH` by `s`. The steps below happen when `state.slot % EPOCH_LENGTH == 0`.
### Helpers ### Helpers
@ -1355,15 +1355,15 @@ All [validators](#dfn-validator):
[Validators](#dfn-Validator) justifying the epoch boundary block at the start of the current epoch: [Validators](#dfn-Validator) justifying the epoch boundary block at the start of the current epoch:
* Let `this_epoch_attestations = [a for a in state.latest_attestations if s <= a.data.slot < s + EPOCH_LENGTH]`. (Note: this is the set of attestations of slots in the epoch `s...s+EPOCH_LENGTH-1`, _not_ attestations that got included in the chain during the epoch `s...s+EPOCH_LENGTH-1`.) * Let `this_epoch_attestations = [a for a in state.latest_attestations if state.slot - EPOCH_LENGTH <= a.data.slot < state.slot]`. (Note: this is the set of attestations of slots in the epoch `state.slot-EPOCH_LENGTH...state.slot-1`, _not_ attestations that got included in the chain during the epoch `state.slot-EPOCH_LENGTH...state.slot-1`.)
* Let `this_epoch_boundary_attestations = [a for a in this_epoch_attestations if a.data.epoch_boundary_hash == get_block_hash(state, s) and a.justified_slot == state.justified_slot]`. * Let `this_epoch_boundary_attestations = [a for a in this_epoch_attestations if a.data.epoch_boundary_hash == get_block_hash(state, state.slot-EPOCH_LENGTH) and a.justified_slot == state.justified_slot]`.
* Let `this_epoch_boundary_attesters` be the union of the [validator](#dfn-validator) index sets given by `[get_attestation_participants(state, a.data, a.participation_bitfield) for a in this_epoch_boundary_attestations]`. * Let `this_epoch_boundary_attesters` be the union of the [validator](#dfn-validator) index sets given by `[get_attestation_participants(state, a.data, a.participation_bitfield) for a in this_epoch_boundary_attestations]`.
* Let `this_epoch_boundary_attesting_balance = sum([get_effective_balance(v) for v in this_epoch_boundary_attesters])`. * Let `this_epoch_boundary_attesting_balance = sum([get_effective_balance(v) for v in this_epoch_boundary_attesters])`.
[Validators](#dfn-Validator) justifying the epoch boundary block at the start of the previous epoch: [Validators](#dfn-Validator) justifying the epoch boundary block at the start of the previous epoch:
* Let `previous_epoch_attestations = [a for a in state.latest_attestations if s - EPOCH_LENGTH <= a.slot < s]`. * Let `previous_epoch_attestations = [a for a in state.latest_attestations if state.slot - 2*EPOCH_LENGTH <= a.slot < state.slot - EPOCH_LENGTH]`.
* Let `previous_epoch_boundary_attestations = [a for a in this_epoch_attestations + previous_epoch_attestations if a.epoch_boundary_hash == get_block_hash(state, s - EPOCH_LENGTH) and a.justified_slot == state.previous_justified_slot]`. * Let `previous_epoch_boundary_attestations = [a for a in this_epoch_attestations + previous_epoch_attestations if a.epoch_boundary_hash == get_block_hash(state, state.slot - 2*EPOCH_LENGTH) and a.justified_slot == state.previous_justified_slot]`.
* Let `previous_epoch_boundary_attesters` be the union of the validator index sets given by `[get_attestation_participants(state, a.data, a.participation_bitfield) for a in previous_epoch_boundary_attestations]`. * Let `previous_epoch_boundary_attesters` be the union of the validator index sets given by `[get_attestation_participants(state, a.data, a.participation_bitfield) for a in previous_epoch_boundary_attestations]`.
* Let `previous_epoch_boundary_attesting_balance = sum([get_effective_balance(v) for v in previous_epoch_boundary_attesters])`. * Let `previous_epoch_boundary_attesting_balance = sum([get_effective_balance(v) for v in previous_epoch_boundary_attesters])`.
@ -1399,14 +1399,14 @@ If `state.slot % POW_RECEIPT_ROOT_VOTING_PERIOD == 0`:
* Set `state.previous_justified_slot = state.justified_slot`. * Set `state.previous_justified_slot = state.justified_slot`.
* Set `state.justification_bitfield = (state.justification_bitfield * 2) % 2**64`. * Set `state.justification_bitfield = (state.justification_bitfield * 2) % 2**64`.
* Set `state.justification_bitfield |= 2` and `state.justified_slot = s - EPOCH_LENGTH` if `3 * previous_epoch_boundary_attesting_balance >= 2 * total_balance`. * Set `state.justification_bitfield |= 2` and `state.justified_slot = state.slot - 2 * EPOCH_LENGTH` if `3 * previous_epoch_boundary_attesting_balance >= 2 * total_balance`.
* Set `state.justification_bitfield |= 1` and `state.justified_slot = s` if `3 * this_epoch_boundary_attesting_balance >= 2 * total_balance`. * Set `state.justification_bitfield |= 1` and `state.justified_slot = state.slot - 1 * EPOCH_LENGTH` if `3 * this_epoch_boundary_attesting_balance >= 2 * total_balance`.
### Finalization ### Finalization
* Set `state.finalized_slot = state.previous_justified_slot` if `state.previous_justified_slot == s - 1 * EPOCH_LENGTH and state.justification_bitfield % 4 == 3`. * Set `state.finalized_slot = state.previous_justified_slot` if `state.previous_justified_slot == state.slot - 2 * EPOCH_LENGTH and state.justification_bitfield % 4 == 3`.
* Set `state.finalized_slot = state.previous_justified_slot` if `state.previous_justified_slot == s - 2 * EPOCH_LENGTH and state.justification_bitfield % 8 == 7`. * Set `state.finalized_slot = state.previous_justified_slot` if `state.previous_justified_slot == state.slot - 3 * EPOCH_LENGTH and state.justification_bitfield % 8 == 7`.
* Set `state.finalized_slot = state.previous_justified_slot` if `state.previous_justified_slot == s - 3 * EPOCH_LENGTH and state.justification_bitfield % 16 in (15, 14)`. * Set `state.finalized_slot = state.previous_justified_slot` if `state.previous_justified_slot == state.slot - 4 * EPOCH_LENGTH and state.justification_bitfield % 16 in (15, 14)`.
### Crosslinks ### Crosslinks
@ -1586,7 +1586,7 @@ while len(state.persistent_committee_reassignments) > 0 and state.persistent_com
### Final updates ### Final updates
* Remove any `attestation` in `state.latest_attestations` such that `attestation.data.slot < s`. * Remove any `attestation` in `state.latest_attestations` such that `attestation.data.slot < state.slot - EPOCH_LENGTH`.
* Run `exit_validator(i, state, penalize=False, current_slot=state.slot)` for indices `i` such that `state.validator_registry[i].status == ACTIVE and state.validator_registry[i].balance < MIN_BALANCE`. * Run `exit_validator(i, state, penalize=False, current_slot=state.slot)` for indices `i` such that `state.validator_registry[i].status == ACTIVE and state.validator_registry[i].balance < MIN_BALANCE`.
* Set `state.latest_block_hashes = state.latest_block_hashes[EPOCH_LENGTH:]`. * Set `state.latest_block_hashes = state.latest_block_hashes[EPOCH_LENGTH:]`.