staticaddr: robustness fixes for withdrawals #1004
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Summary of Changes
Hello @hieblmi, 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 robustness and reliability of the static address withdrawal system. It implements crucial concurrency controls to safeguard deposit data during complex operations and introduces a new validation step to prevent potential issues when adjusting fees for existing withdrawals.
Highlights
- Concurrency Control: Introduced explicit locking and unlocking mechanisms for deposits within the withdrawal process to ensure data consistency and prevent race conditions during state transitions.
- Withdrawal Robustness: Added a new validation check to ensure that deposits undergoing a fee bump have a reference to their finalized withdrawal transaction, preventing issues with incomplete withdrawal records.
- Code Clarity: Improved the clarity and grammatical correctness of several comments throughout the withdrawal manager code.
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Code Review
This pull request introduces several robustness fixes for the withdrawal process in staticaddr. The main changes include adding locking to prevent race conditions when accessing deposits during a withdrawal, and adding a check to ensure a previous withdrawal transaction exists when attempting a fee bump. While the changes improve robustness, there are a few areas for improvement. The locking logic is duplicated and could be simplified for better readability. Additionally, an error is misused for the new check, and a more specific error would be clearer. There is also a minor grammatical issue in a comment.
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Code Review
This pull request introduces several robustness fixes for the withdrawal process, particularly around fee bumping. It adds new error types and checks to ensure that fee bumps are only performed on valid sets of deposits. A significant change is the refactoring of the locking mechanism for deposits within WithdrawDeposits to lock all deposits at once.
My review focuses on the correctness of this new locking strategy. I've identified a critical issue where locks are not released on several early-return paths, which could lead to deadlocks. I've also provided a minor suggestion to improve the grammar in a code comment for better clarity.
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Code Review
This pull request introduces several robustness fixes for withdrawals in the staticaddr package. The most significant change is the refactoring of the locking mechanism in the WithdrawDeposits function. By acquiring a lock on all relevant deposits at the beginning of the function and carefully managing it, the new implementation effectively prevents potential race conditions and deadlocks. Additionally, a new sanity check is added to ensure that a finalized transaction is present when bumping the fee for a withdrawal, which further improves the robustness of the process. The changes are well-structured and significantly enhance the reliability of the withdrawal logic. I have one suggestion regarding code organization.
staticaddr/withdraw/manager.go
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| lockDeposits(deposits) | ||
| locked := true | ||
| defer func() { | ||
| if locked { |
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nit: we could set locked = true in lockDeposits and then check if locked within unlockDeposits for a slight readability gain.
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