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Correct checks for backfill completeness (#4465)

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## Issue Addressed

#4331 

## Proposed Changes

 - Use comparison rather than strict equality between the earliest epoch we know about and the backfill target (which will be the most recent WSP by default or genesis)
 - Add helper function `BackFillSync<T>::would_complete` to achieve this in one location

## Additional Info

 - There's an ad hoc test for this in #4461


Co-authored-by: Age Manning <Age@AgeManning.com>
This commit is contained in:
Jack McPherson 2023-07-06 07:35:31 +00:00
parent dfcb3363c7
commit a6d5c7d7e0
1 changed files with 12 additions and 19 deletions
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31
beacon_node/network/src/sync/backfill_sync/mod.rs
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@ -1098,12 +1098,7 @@ impl<T: BeaconChainTypes> BackFillSync<T> {
match self.batches.entry(batch_id) {
Entry::Occupied(_) => {
// this batch doesn't need downloading, let this same function decide the next batch
if batch_id
== self
.beacon_chain
.genesis_backfill_slot
.epoch(T::EthSpec::slots_per_epoch())
{
if self.would_complete(batch_id) {
self.last_batch_downloaded = true;
}
@ -1114,12 +1109,7 @@ impl<T: BeaconChainTypes> BackFillSync<T> {
}
Entry::Vacant(entry) => {
entry.insert(BatchInfo::new(&batch_id, BACKFILL_EPOCHS_PER_BATCH));
if batch_id
== self
.beacon_chain
.genesis_backfill_slot
.epoch(T::EthSpec::slots_per_epoch())
{
if self.would_complete(batch_id) {
self.last_batch_downloaded = true;
}
self.to_be_downloaded = self
@ -1151,14 +1141,8 @@ impl<T: BeaconChainTypes> BackFillSync<T> {
/// Checks with the beacon chain if backfill sync has completed.
fn check_completed(&mut self) -> bool {
if self.current_start
== self
.beacon_chain
.genesis_backfill_slot
.epoch(T::EthSpec::slots_per_epoch())
{
if self.would_complete(self.current_start) {
// Check that the beacon chain agrees
if let Some(anchor_info) = self.beacon_chain.store.get_anchor_info() {
// Conditions that we have completed a backfill sync
if anchor_info.block_backfill_complete(self.beacon_chain.genesis_backfill_slot) {
@ -1171,6 +1155,15 @@ impl<T: BeaconChainTypes> BackFillSync<T> {
false
}
/// Checks if backfill would complete by syncing to `start_epoch`.
fn would_complete(&self, start_epoch: Epoch) -> bool {
start_epoch
<= self
.beacon_chain
.genesis_backfill_slot
.epoch(T::EthSpec::slots_per_epoch())
}
/// Updates the global network state indicating the current state of a backfill sync.
fn set_state(&self, state: BackFillState) {
*self.network_globals.backfill_state.write() = state;