fix: skip irrelevant helios errors on circuit#13
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Summary of ChangesHello @vlopes11, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the light client's resilience and efficiency by introducing a sophisticated error handling strategy for Helios consensus updates. It allows the system to gracefully ignore certain non-critical errors, ensuring smoother operation. Alongside this, a comprehensive update of project dependencies brings in the latest features and fixes, while a new build optimization streamlines the development and CI process for the light client controller. Highlights
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Code Review
This pull request aims to skip irrelevant Helios errors during circuit execution by updating dependencies, adding eyre for error handling, and refactoring the light client state update logic. The changes introduce a new error filtering mechanism which is a good step towards making the process more robust. However, I've identified two critical bugs in the new update logic where updates are applied regardless of their verification status, which could lead to state corruption. I've also found a minor issue with a misleading error message. Please see the detailed comments for suggestions on how to fix these issues.
| for u in updates.iter() { | ||
| verify_update(u, *expected_current_slot, &self.store, genesis_root, &forks) | ||
| .map_err(|e| anyhow::anyhow!("failed to verify update: {e}"))?; | ||
| if let Err(e) = | ||
| verify_update(u, *expected_current_slot, &self.store, genesis_root, &forks) | ||
| { | ||
| Self::filter_error(&e)?; | ||
| } | ||
|
|
||
| apply_update(&mut self.store, u); | ||
| } |
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There's a critical bug in this loop. apply_update is called for every update, even if verify_update fails. The if let Err(e) block might swallow the error via filter_error, but execution proceeds to line 100, where apply_update is called with a potentially invalid update. This could corrupt the store state. The update should only be applied if verification succeeds.
for u in updates.iter() {
match verify_update(u, *expected_current_slot, &self.store, genesis_root, &forks) {
Ok(_) => apply_update(&mut self.store, u),
Err(e) => Self::filter_error(&e)?,
}
}| if let Err(e) = verify_finality_update( | ||
| finality_update, | ||
| *expected_current_slot, | ||
| &self.store, | ||
| genesis_root, | ||
| &forks, | ||
| ) | ||
| .map_err(|e| anyhow::anyhow!("failed to verify finality update: {e}"))?; | ||
| ) { | ||
| Self::filter_error(&e)?; | ||
| } | ||
|
|
||
| apply_finality_update(&mut self.store, finality_update); |
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Similar to the loop for updates, there's a critical bug here. apply_finality_update is called unconditionally, even if verify_finality_update returns an error that is subsequently filtered. Applying an unverified finality update can lead to a corrupt or invalid light client state. The finality update should only be applied upon successful verification.
match verify_finality_update(
finality_update,
*expected_current_slot,
&self.store,
genesis_root,
&forks,
) {
Ok(_) => apply_finality_update(&mut self.store, finality_update),
Err(e) => Self::filter_error(&e)?,
}| anyhow::ensure!( | ||
| self.store.finalized_header.beacon().slot > prev_head, | ||
| self.store.finalized_header.beacon().slot >= prev_head, | ||
| "New head is not greater than previous head." | ||
| ); |
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The check was changed from > to >=, but the error message "New head is not greater than previous head." was not updated. This is now misleading. If the new head slot is equal to the previous head, the check will pass, but the error message would technically be a true statement about the situation, which is confusing. The message should be updated to reflect that the new head cannot be older than the previous one.
anyhow::ensure!(
self.store.finalized_header.beacon().slot >= prev_head,
"New head is older than previous head."
);
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