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Expose SlotHistory::oldest() -> Slot (#10799)

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Ryo Onodera 2020-06-25 18:23:31 +09:00 committed by GitHub
parent b3e382ab3f
commit 9f5bd5fe81
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1 changed files with 17 additions and 1 deletions
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18
sdk/src/slot_history.rs
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@ -65,7 +65,7 @@ impl SlotHistory {
pub fn check(&self, slot: Slot) -> Check {
if slot >= self.next_slot {
Check::Future
} else if self.next_slot - slot > MAX_ENTRIES {
} else if slot < self.oldest() {
Check::TooOld
} else if self.bits.get(slot % MAX_ENTRIES) {
Check::Found
@ -73,6 +73,10 @@ impl SlotHistory {
Check::NotFound
}
}
pub fn oldest(&self) -> Slot {
self.next_slot.saturating_sub(MAX_ENTRIES)
}
}
#[cfg(test)]
@ -183,4 +187,16 @@ mod tests {
assert_eq!(slot_history.check(6), Check::Future);
assert_eq!(slot_history.check(11), Check::Future);
}
#[test]
fn test_oldest() {
let mut slot_history = SlotHistory::default();
assert_eq!(slot_history.oldest(), 0);
slot_history.add(10);
assert_eq!(slot_history.oldest(), 0);
slot_history.add(MAX_ENTRIES - 1);
assert_eq!(slot_history.oldest(), 0);
slot_history.add(MAX_ENTRIES);
assert_eq!(slot_history.oldest(), 1);
}
}