118 lines
3.4 KiB
Rust
118 lines
3.4 KiB
Rust
use crate::{blockstore::*, blockstore_meta::SlotMeta};
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use solana_sdk::clock::Slot;
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pub struct NextSlotsIterator<'a> {
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pending_slots: Vec<Slot>,
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blockstore: &'a Blockstore,
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}
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impl<'a> NextSlotsIterator<'a> {
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pub fn new(start_slot: Slot, blockstore: &'a Blockstore) -> Self {
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Self {
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pending_slots: vec![start_slot],
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blockstore,
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}
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}
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}
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impl<'a> Iterator for NextSlotsIterator<'a> {
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type Item = (Slot, SlotMeta);
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fn next(&mut self) -> Option<Self::Item> {
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if self.pending_slots.is_empty() {
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None
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} else {
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let slot = self.pending_slots.pop().unwrap();
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if let Some(slot_meta) = self.blockstore.meta(slot).unwrap() {
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self.pending_slots.extend(slot_meta.next_slots.iter());
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Some((slot, slot_meta))
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} else {
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None
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}
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}
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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::*;
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use crate::blockstore_processor::fill_blockstore_slot_with_ticks;
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use solana_sdk::hash::Hash;
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use std::collections::HashSet;
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#[test]
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fn test_next_slots_iterator() {
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let blockstore_path = get_tmp_ledger_path!();
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let blockstore = Blockstore::open(&blockstore_path).unwrap();
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blockstore.set_roots(&[0]).unwrap();
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let ticks_per_slot = 5;
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/*
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Build a blockstore in the ledger with the following fork structure:
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slot 0
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slot 1 <-- set_root
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/ \
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slot 2 |
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/ |
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slot 3 |
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slot 4
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*/
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// Fork 1, ending at slot 3
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let last_entry_hash = Hash::default();
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let fork_point = 1;
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let mut fork_hash = Hash::default();
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for slot in 0..=3 {
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let parent = {
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if slot == 0 {
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0
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} else {
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slot - 1
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}
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};
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let last_entry_hash = fill_blockstore_slot_with_ticks(
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&blockstore,
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ticks_per_slot,
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slot,
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parent,
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last_entry_hash,
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);
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if slot == fork_point {
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fork_hash = last_entry_hash;
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}
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}
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// Fork 2, ending at slot 4
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let _ =
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fill_blockstore_slot_with_ticks(&blockstore, ticks_per_slot, 4, fork_point, fork_hash);
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// Trying to get an iterator on any slot on the root fork should succeed
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let result: HashSet<_> = NextSlotsIterator::new(0, &blockstore)
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.into_iter()
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.map(|(slot, _)| slot)
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.collect();
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let expected = vec![0, 1, 2, 3, 4].into_iter().collect();
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assert_eq!(result, expected);
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let result: HashSet<_> = NextSlotsIterator::new(2, &blockstore)
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.into_iter()
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.map(|(slot, _)| slot)
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.collect();
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let expected = vec![2, 3].into_iter().collect();
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assert_eq!(result, expected);
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let result: HashSet<_> = NextSlotsIterator::new(4, &blockstore)
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.into_iter()
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.map(|(slot, _)| slot)
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.collect();
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let expected = vec![4].into_iter().collect();
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assert_eq!(result, expected);
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drop(blockstore);
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Blockstore::destroy(&blockstore_path).expect("Expected successful database destruction");
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}
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}
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