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use EFFECTIVE_BALANCE_INCREMENT to normalize reward calculations

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Danny Ryan 2020-03-03 15:34:02 -07:00
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specs/phase0/beacon-chain.md
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@ -194,7 +194,6 @@ The following values are (non-configurable) constants used throughout the specif
| `MAX_EFFECTIVE_BALANCE` | `Gwei(2**5 * 10**9)` (= 32,000,000,000) | | `MAX_EFFECTIVE_BALANCE` | `Gwei(2**5 * 10**9)` (= 32,000,000,000) |
| `EJECTION_BALANCE` | `Gwei(2**4 * 10**9)` (= 16,000,000,000) | | `EJECTION_BALANCE` | `Gwei(2**4 * 10**9)` (= 16,000,000,000) |
| `EFFECTIVE_BALANCE_INCREMENT` | `Gwei(2**0 * 10**9)` (= 1,000,000,000) | | `EFFECTIVE_BALANCE_INCREMENT` | `Gwei(2**0 * 10**9)` (= 1,000,000,000) |
| `REWARD_OVERFLOW_INCREMENT` | `Gwei(2**6)` (= 64) |
### Initial values ### Initial values
@ -1314,9 +1313,9 @@ def get_attestation_deltas(state: BeaconState) -> Tuple[Sequence[Gwei], Sequence
attesting_balance = get_total_balance(state, unslashed_attesting_indices) attesting_balance = get_total_balance(state, unslashed_attesting_indices)
for index in eligible_validator_indices: for index in eligible_validator_indices:
if index in unslashed_attesting_indices: if index in unslashed_attesting_indices:
increment = REWARD_OVERFLOW_INCREMENT # Factored out from reward numerator to avoid uint64 overflow increment = EFFECTIVE_BALANCE_INCREMENT # Factored out from balance totals to avoid uint64 overflow
reward_numerator = get_base_reward(state, index) // increment * attesting_balance reward_numerator = get_base_reward(state, index) * (attesting_balance // increment)
rewards[index] = reward_numerator // total_balance * increment rewards[index] = reward_numerator // (total_balance // increment)
else: else:
penalties[index] += get_base_reward(state, index) penalties[index] += get_base_reward(state, index)