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refactor(flamenco,rewards): refactor_epoch_inflation_rewards #8318

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refactor(flamenco,rewards): refactor_epoch_inflation_rewards #8318

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075a9a7
refactor refactor_epoch_inflation_rewards
mubarizkyc Feb 17, 2026
20c6822
remove unused field prev_epoch_duration_in_years
mubarizkyc Feb 17, 2026
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2 changes: 1 addition & 1 deletion agave
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Submodule agave updated 1 files
+4 −3 poh/src/firedancer_poh_recorder.rs
30 changes: 14 additions & 16 deletions src/flamenco/rewards/fd_rewards.c
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Original file line number Diff line number Diff line change
Expand Up @@ -418,19 +418,18 @@ epoch_duration_in_years( fd_bank_t const * bank,
return (double)slots_in_epoch / (double)fd_bank_slots_per_year_get( bank );
}

/* https://github.com/anza-xyz/agave/blob/7117ed9653ce19e8b2dea108eff1f3eb6a3378a7/runtime/src/bank.rs#L2128 */
/* https://github.com/anza-xyz/agave/blob/3eb0a7b7bcf5a5f2346b9a39b92c6896fe8fe668/runtime/src/bank.rs#L2400 */
static void
calculate_previous_epoch_inflation_rewards( fd_bank_t const * bank,
ulong prev_epoch_capitalization,
ulong prev_epoch,
fd_prev_epoch_inflation_rewards_t * rewards ) {
calculate_epoch_inflation_rewards( fd_bank_t const * bank,
ulong capitalization,
ulong epoch,
fd_epoch_inflation_rewards_t * rewards ) {
double slot_in_year = slot_in_year_for_inflation( bank );

double epoch_duration_in_years_ = epoch_duration_in_years( bank, epoch );
rewards->validator_rate = validator( fd_bank_inflation_query( bank ), slot_in_year );
rewards->foundation_rate = foundation( fd_bank_inflation_query( bank ), slot_in_year );
rewards->prev_epoch_duration_in_years = epoch_duration_in_years( bank, prev_epoch );
rewards->validator_rewards = (ulong)(rewards->validator_rate * (double)prev_epoch_capitalization * rewards->prev_epoch_duration_in_years);
FD_LOG_DEBUG(( "Rewards %lu, Rate %.16f, Duration %.18f Capitalization %lu Slot in year %.16f", rewards->validator_rewards, rewards->validator_rate, rewards->prev_epoch_duration_in_years, prev_epoch_capitalization, slot_in_year ));
rewards->validator_rewards_lamports = (ulong)(rewards->validator_rate * (double)capitalization * epoch_duration_in_years_);
FD_LOG_DEBUG(( "Rewards %lu, Rate %.16f, Duration %.18f Capitalization %lu Slot in year %.16f", rewards->validator_rewards_lamports, rewards->validator_rate, epoch_duration_in_years_, capitalization, slot_in_year ));
}

/* https://github.com/anza-xyz/agave/blob/cbc8320d35358da14d79ebcada4dfb6756ffac79/programs/stake/src/lib.rs#L29 */
Expand Down Expand Up @@ -706,14 +705,14 @@ calculate_rewards_for_partitioning( fd_bank_t * bank,
fd_capture_ctx_t * capture_ctx,
ulong prev_epoch,
fd_partitioned_rewards_calculation_t * result ) {
fd_prev_epoch_inflation_rewards_t rewards;
fd_epoch_inflation_rewards_t rewards;

calculate_previous_epoch_inflation_rewards( bank,
fd_bank_capitalization_get( bank ),
prev_epoch,
&rewards );
calculate_epoch_inflation_rewards( bank,
fd_bank_capitalization_get( bank ),
prev_epoch,
&rewards );

ulong total_rewards = rewards.validator_rewards;
ulong total_rewards = rewards.validator_rewards_lamports;

uint128 points = calculate_validator_rewards( bank,
accdb,
Expand All @@ -731,7 +730,6 @@ calculate_rewards_for_partitioning( fd_bank_t * bank,
result->validator_rewards = total_rewards;
result->validator_rate = rewards.validator_rate;
result->foundation_rate = rewards.foundation_rate;
result->prev_epoch_duration_in_years = rewards.prev_epoch_duration_in_years;
result->capitalization = fd_bank_capitalization_get( bank );
}

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9 changes: 4 additions & 5 deletions src/flamenco/rewards/fd_rewards.h
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Original file line number Diff line number Diff line change
Expand Up @@ -5,21 +5,20 @@

#include "../stakes/fd_stake_delegations.h"

struct fd_prev_epoch_inflation_rewards {
ulong validator_rewards;
double prev_epoch_duration_in_years;
// https://github.com/anza-xyz/agave/blob/3eb0a7b7bcf5a5f2346b9a39b92c6896fe8fe668/runtime/src/bank.rs#L972
struct fd_epoch_inflation_rewards {
ulong validator_rewards_lamports;
double validator_rate;
double foundation_rate;
};
typedef struct fd_prev_epoch_inflation_rewards fd_prev_epoch_inflation_rewards_t;
typedef struct fd_epoch_inflation_rewards fd_epoch_inflation_rewards_t;

struct fd_partitioned_rewards_calculation {
uint128 validator_points;
ulong old_vote_balance_and_staked;
ulong validator_rewards;
double validator_rate;
double foundation_rate;
double prev_epoch_duration_in_years;
ulong capitalization;
};
typedef struct fd_partitioned_rewards_calculation fd_partitioned_rewards_calculation_t;
Expand Down