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Merge pull request #471 from ethereum/crosslink-iter 

cleanup crosslink committees usage
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Danny Ryan 2019-01-18 09:56:03 -06:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -1632,7 +1632,7 @@ All [validators](#dfn-validator):
**Note**: `previous_epoch_boundary_attesting_balance` balance might be marginally different than `current_epoch_boundary_attesting_balance` during the previous epoch transition. Due to the tight bound on validator churn each epoch and small per-epoch rewards/penalties, the potential balance difference is very low and only marginally affects consensus safety.
For every `slot in range(state.slot - 2 * EPOCH_LENGTH, state.slot)`, let `crosslink_committee_at_slot = get_crosslink_committees_at_slot(slot)`. For every `(crosslink_committee, shard)` in `crosslink_committee_at_slot`, compute:
For every `slot in range(state.slot - 2 * EPOCH_LENGTH, state.slot)`, let `crosslink_committees_at_slot = get_crosslink_committees_at_slot(state, slot)`. For every `(crosslink_committee, shard)` in `crosslink_committees_at_slot`, compute:
* Let `shard_block_root` be `state.latest_crosslinks[shard].shard_block_root`
* Let `attesting_validator_indices(crosslink_committee, shard_block_root)` be the union of the [validator](#dfn-validator) index sets given by `[get_attestation_participants(state, a.data, a.aggregation_bitfield) for a in current_epoch_attestations + previous_epoch_attestations if a.shard == shard and a.shard_block_root == shard_block_root]`.
@ -1668,7 +1668,7 @@ Set `state.finalized_slot = state.previous_justified_slot` if any of the followi
### Crosslinks
For every `slot in range(state.slot - 2 * EPOCH_LENGTH, state.slot)`, let `crosslink_committee_at_slot = get_crosslink_committees_at_slot(slot)`. For every `(crosslink_committee, shard)` in `crosslink_committee_at_slot`, compute:
For every `slot in range(state.slot - 2 * EPOCH_LENGTH, state.slot)`, let `crosslink_committees_at_slot = get_crosslink_committees_at_slot(state, slot)`. For every `(crosslink_committee, shard)` in `crosslink_committees_at_slot`, compute:
* Set `state.latest_crosslinks[shard] = Crosslink(slot=state.slot, shard_block_root=winning_root(crosslink_committee))` if `3 * total_attesting_balance(crosslink_committee) >= 2 * total_balance(crosslink_committee)`.
@ -1714,7 +1714,7 @@ For each `index` in `previous_epoch_attester_indices`, we determine the proposer
#### Crosslinks
For every `i in range(state.slot - 2 * EPOCH_LENGTH, state.slot - EPOCH_LENGTH)`, let `crosslink_committee_at_slot, start_shard = get_crosslink_committees_at_slot(i)`. For every `j in range(len(crosslink_committee_at_slot))`, let `crosslink_committee = crosslink_committee_at_slot[j]`, `shard = (start_shard + j) % SHARD_COUNT`, and compute:
For every `slot in range(state.slot - 2 * EPOCH_LENGTH, state.slot - EPOCH_LENGTH)`, let `crosslink_committees_at_slot = get_crosslink_committees_at_slot(state, slot)`. For every `(crosslink_committee, shard)` in `crosslink_committees_at_slot`, compute:
* If `index in attesting_validators(crosslink_committee)`, `state.validator_balances[index] += base_reward(state, index) * total_attesting_balance(crosslink_committee) // total_balance(crosslink_committee))`.
* If `index not in attesting_validators(crosslink_committee)`, `state.validator_balances[index] -= base_reward(state, index)`.