110 lines
3.1 KiB
Rust
110 lines
3.1 KiB
Rust
//! A type to hold data for the [`SlotHashes` sysvar][sv].
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//!
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//! [sv]: https://docs.solana.com/developing/runtime-facilities/sysvars#slothashes
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//!
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//! The sysvar ID is declared in [`sysvar::slot_hashes`].
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//!
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//! [`sysvar::slot_hashes`]: crate::sysvar::slot_hashes
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pub use crate::clock::Slot;
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use {
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crate::hash::Hash,
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std::{
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iter::FromIterator,
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ops::Deref,
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sync::atomic::{AtomicUsize, Ordering},
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},
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};
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pub const MAX_ENTRIES: usize = 512; // about 2.5 minutes to get your vote in
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// This is to allow tests with custom slot hash expiry to avoid having to generate
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// 512 blocks for such tests.
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static NUM_ENTRIES: AtomicUsize = AtomicUsize::new(MAX_ENTRIES);
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pub fn get_entries() -> usize {
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NUM_ENTRIES.load(Ordering::Relaxed)
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}
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pub fn set_entries_for_tests_only(entries: usize) {
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NUM_ENTRIES.store(entries, Ordering::Relaxed);
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}
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pub type SlotHash = (Slot, Hash);
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#[repr(C)]
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#[derive(Serialize, Deserialize, PartialEq, Eq, Debug, Default)]
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pub struct SlotHashes(Vec<SlotHash>);
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impl SlotHashes {
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pub fn add(&mut self, slot: Slot, hash: Hash) {
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match self.binary_search_by(|(probe, _)| slot.cmp(probe)) {
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Ok(index) => (self.0)[index] = (slot, hash),
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Err(index) => (self.0).insert(index, (slot, hash)),
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}
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(self.0).truncate(get_entries());
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}
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pub fn position(&self, slot: &Slot) -> Option<usize> {
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self.binary_search_by(|(probe, _)| slot.cmp(probe)).ok()
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}
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#[allow(clippy::trivially_copy_pass_by_ref)]
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pub fn get(&self, slot: &Slot) -> Option<&Hash> {
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self.binary_search_by(|(probe, _)| slot.cmp(probe))
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.ok()
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.map(|index| &self[index].1)
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}
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pub fn new(slot_hashes: &[SlotHash]) -> Self {
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let mut slot_hashes = slot_hashes.to_vec();
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slot_hashes.sort_by(|(a, _), (b, _)| b.cmp(a));
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Self(slot_hashes)
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}
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pub fn slot_hashes(&self) -> &[SlotHash] {
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&self.0
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}
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}
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impl FromIterator<(Slot, Hash)> for SlotHashes {
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fn from_iter<I: IntoIterator<Item = (Slot, Hash)>>(iter: I) -> Self {
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Self(iter.into_iter().collect())
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}
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}
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impl Deref for SlotHashes {
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type Target = Vec<SlotHash>;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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#[cfg(test)]
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mod tests {
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use {super::*, crate::hash::hash};
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#[test]
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fn test() {
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let mut slot_hashes = SlotHashes::new(&[(1, Hash::default()), (3, Hash::default())]);
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slot_hashes.add(2, Hash::default());
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assert_eq!(
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slot_hashes,
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SlotHashes(vec![
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(3, Hash::default()),
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(2, Hash::default()),
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(1, Hash::default()),
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])
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);
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let mut slot_hashes = SlotHashes::new(&[]);
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for i in 0..MAX_ENTRIES + 1 {
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slot_hashes.add(
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i as u64,
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hash(&[(i >> 24) as u8, (i >> 16) as u8, (i >> 8) as u8, i as u8]),
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);
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}
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for i in 0..MAX_ENTRIES {
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assert_eq!(slot_hashes[i].0, (MAX_ENTRIES - i) as u64);
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}
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assert_eq!(slot_hashes.len(), MAX_ENTRIES);
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}
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}
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