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Use bounded timestamp-correction when feature enabled

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This commit is contained in:
Tyera Eulberg
2020-10-23 15:06:57 -06:00
committed by Michael Vines
parent 80db6c0980
commit 90778615f6
3 changed files with 172 additions and 18 deletions
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27
sdk/src/stake_weighted_timestamp.rs
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@ -110,13 +110,22 @@ fn calculate_bounded_stake_weighted_timestamp(
let poh_estimate_offset = slot.saturating_sub(epoch_start_slot) as u32 * slot_duration;
let estimate_offset =
Duration::from_secs(estimate.saturating_sub(epoch_start_timestamp) as u64);
let delta = if estimate_offset > poh_estimate_offset {
estimate_offset - poh_estimate_offset
} else {
poh_estimate_offset - estimate_offset
};
if delta > poh_estimate_offset * MAX_ALLOWABLE_DRIFT_PERCENTAGE / 100 {
estimate = epoch_start_timestamp + poh_estimate_offset.as_secs() as i64;
let max_allowable_drift = poh_estimate_offset * MAX_ALLOWABLE_DRIFT_PERCENTAGE / 100;
if estimate_offset > poh_estimate_offset
&& estimate_offset - poh_estimate_offset > max_allowable_drift
{
// estimate offset since the start of the epoch is higher than
// `MAX_ALLOWABLE_DRIFT_PERCENTAGE`
estimate = epoch_start_timestamp
+ poh_estimate_offset.as_secs() as i64
+ max_allowable_drift.as_secs() as i64;
} else if estimate_offset < poh_estimate_offset
&& poh_estimate_offset - estimate_offset > max_allowable_drift
{
// estimate offset since the start of the epoch is lower than
// `MAX_ALLOWABLE_DRIFT_PERCENTAGE`
estimate = epoch_start_timestamp + poh_estimate_offset.as_secs() as i64
- max_allowable_drift.as_secs() as i64;
}
}
Some(estimate)
@ -503,7 +512,7 @@ pub mod tests {
Some((0, epoch_start_timestamp)),
)
.unwrap();
assert_eq!(bounded, poh_estimate);
assert_eq!(bounded, poh_estimate + acceptable_delta);
// Test when stake-weighted median is too low
let unique_timestamps: HashMap<Pubkey, (Slot, UnixTimestamp)> = [
@ -523,7 +532,7 @@ pub mod tests {
Some((0, epoch_start_timestamp)),
)
.unwrap();
assert_eq!(bounded, poh_estimate);
assert_eq!(bounded, poh_estimate - acceptable_delta);
// Test stake-weighted median within bounds
let unique_timestamps: HashMap<Pubkey, (Slot, UnixTimestamp)> = [