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ref(chain): Refactor reveal_to_target

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Simplify the `reveal_to_target` algorithm by exiting prematurely if
the `target_index` is already revealed.
Since the `reveal_to_index` variable was different from
`Some(target_index)` only if the target was already revealed, we can
getrid of the variable altogether.
This commit is contained in:
Daniela Brozzoni 2024-01-08 14:47:28 +01:00
parent 21d8875826
commit 887e112e8f
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GPG Key ID: 7DE4F1FDCED0AB87
1 changed files with 22 additions and 32 deletions
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54
crates/chain/src/keychain/txout_index.rs
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@ -364,51 +364,41 @@ impl<K: Clone + Ord + Debug> KeychainTxOutIndex<K> {
let has_wildcard = descriptor.has_wildcard();
let target_index = if has_wildcard { target_index } else { 0 };
let next_reveal_index = self.last_revealed.get(keychain).map_or(0, |v| *v + 1);
let next_reveal_index = self
.last_revealed
.get(keychain)
.map_or(0, |index| *index + 1);
debug_assert!(next_reveal_index + self.lookahead >= self.next_store_index(keychain));
// if we need to reveal new indices, the latest revealed index goes here
let mut reveal_to_index = None;
// if the target is not yet revealed, but is already stored (due to lookahead), we need to
// set the `reveal_to_index` as target here (as the `for` loop below only updates
// `reveal_to_index` for indexes that are NOT stored)
if next_reveal_index <= target_index && target_index < next_reveal_index + self.lookahead {
reveal_to_index = Some(target_index);
// If the target_index is already revealed, we are done
if next_reveal_index > target_index {
return (
SpkIterator::new_with_range(
descriptor.clone(),
next_reveal_index..next_reveal_index,
),
super::ChangeSet::default(),
);
}
// we range over indexes that are not stored
// We range over the indexes that are not stored and insert their spks in the index.
// Indexes from next_reveal_index to next_reveal_index + lookahead are already stored (due
// to lookahead), so we only range from next_reveal_index + lookahead to target + lookahead
let range = next_reveal_index + self.lookahead..=target_index + self.lookahead;
for (new_index, new_spk) in SpkIterator::new_with_range(descriptor, range) {
let _inserted = self
.inner
.insert_spk((keychain.clone(), new_index), new_spk);
debug_assert!(_inserted, "must not have existing spk",);
// everything after `target_index` is stored for lookahead only
if new_index <= target_index {
reveal_to_index = Some(new_index);
}
}
match reveal_to_index {
Some(index) => {
let _old_index = self.last_revealed.insert(keychain.clone(), index);
debug_assert!(_old_index < Some(index));
(
SpkIterator::new_with_range(descriptor.clone(), next_reveal_index..index + 1),
super::ChangeSet(core::iter::once((keychain.clone(), index)).collect()),
)
}
None => (
SpkIterator::new_with_range(
descriptor.clone(),
next_reveal_index..next_reveal_index,
),
super::ChangeSet::default(),
),
}
let _old_index = self.last_revealed.insert(keychain.clone(), target_index);
debug_assert!(_old_index < Some(target_index));
(
SpkIterator::new_with_range(descriptor.clone(), next_reveal_index..target_index + 1),
super::ChangeSet(core::iter::once((keychain.clone(), target_index)).collect()),
)
}
/// Attempts to reveal the next script pubkey for `keychain`.