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Add note on why LifetimeStage is monotonic

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This commit is contained in:
Luke Parker 2024-08-29 21:47:25 -04:00
parent a8b9b7bad3
commit 7266e7f7ea
1 changed files with 33 additions and 13 deletions
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46
processor/scanner/src/eventuality/mod.rs
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@ -351,31 +351,51 @@ impl<D: Db, S: ScannerFeed, Sch: Scheduler<S>> ContinuallyRan for EventualityTas
scheduler_update.forwards.sort_by(sort_outputs);
scheduler_update.returns.sort_by(|a, b| sort_outputs(&a.output, &b.output));
// Sanity check we've never accumulated these outputs before
{
let empty = {
let a: core::slice::Iter<'_, OutputFor<S>> = scheduler_update.outputs.iter();
let b: core::slice::Iter<'_, OutputFor<S>> = scheduler_update.forwards.iter();
let c = scheduler_update.returns.iter().map(|output_to_return| &output_to_return.output);
let mut all_outputs = a.chain(b).chain(c).peekable();
for output in a.chain(b).chain(c) {
// If we received any output, sanity check this block is notable
let empty = all_outputs.peek().is_none();
if !empty {
assert!(is_block_notable, "accumulating output(s) in non-notable block");
}
// Sanity check we've never accumulated these outputs before
for output in all_outputs {
assert!(
!EventualityDb::<S>::prior_accumulated_output(&txn, &output.id()),
"prior accumulated an output with this ID"
);
EventualityDb::<S>::accumulated_output(&mut txn, &output.id());
}
}
// Intake the new Eventualities
let new_eventualities =
self.scheduler.update(&mut txn, &keys_with_stages, scheduler_update);
for key in new_eventualities.keys() {
keys
.iter()
.find(|serai_key| serai_key.key.to_bytes().as_ref() == key.as_slice())
.expect("intaking Eventuality for key which isn't active");
empty
};
if !empty {
// Accumulate the outputs
/*
This uses the `keys_with_stages` for the current block, yet this block is notable.
Accordingly, all future intaked Burns will use at least this block when determining
what LifetimeStage a key is. That makes the LifetimeStage monotonically incremented. If
this block wasn't notable, we'd potentially intake Burns with the LifetimeStage
determined off an earlier block than this (enabling an earlier LifetimeStage to be used
after a later one was already used).
*/
let new_eventualities =
self.scheduler.update(&mut txn, &keys_with_stages, scheduler_update);
// Intake the new Eventualities
for key in new_eventualities.keys() {
keys
.iter()
.find(|serai_key| serai_key.key.to_bytes().as_ref() == key.as_slice())
.expect("intaking Eventuality for key which isn't active");
}
intake_eventualities::<S>(&mut txn, new_eventualities);
}
intake_eventualities::<S>(&mut txn, new_eventualities);
}
for key in &keys {