fix(key-wallet): collect a sweep's surviving inputs once instead of per candidate - #966
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…er candidate `retain_unclaimed` rescanned every account's every record's every input for each released outpoint, which is O(released × retained history). Neither factor is bounded by anything the wallet controls: a peer can hand it a transaction with an arbitrarily large input vector paying an address the wallet owns, and a later final transaction need conflict with only one of those inputs for the rest to become candidates. Against a populated history that is tens of millions of comparisons, run while the manager holds the winner mutably and before the event can reach persistence at all. Collect the claimed inputs once and probe by hash. This is what the function did before it was inverted on review; the argument for inverting was to avoid allocating a set to check "usually 0-2 candidates", but a single candidate already costs a full pass over the history under the alternative, so the set was never the worse trade. Covered by a 4000-candidate release set against a 4000-record history.
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ChangesWallet conflict sweep
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This localized performance improvement preserves sweep behavior while reducing repeated history scans. No actionable merge-blocking risk remains beyond normal checks and review. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@key-wallet/src/wallet/managed_wallet_info/helpers.rs`:
- Around line 110-136: Rename the pull request title to use an allowed semantic
prefix, such as “refactor: optimize unclaimed outpoint filtering,” while
preserving its description of the retain_unclaimed optimization.
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key-wallet/src/wallet/managed_wallet_info/helpers.rs
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## dev #966 +/- ##
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+ Coverage 76.91% 76.94% +0.02%
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Files 329 329
Lines 82407 82465 +58
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+ Hits 63383 63449 +66
+ Misses 19024 19016 -8
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@coderabbitai review The only finding in the Nothing has changed on the branch since; |
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✅ Action performedFull review finished. |
dashpay/rust-dashcore#966 merged as 75f318bd, so the pin moves off f4b907c3 — that PR's own branch head, which was never reachable from dev — onto the merge commit. The revision carries the conflict sweep's surviving-input set built once with constant-time membership checks, replacing the per-candidate scan over every account, record and input that made release filtering O(R×H) against peer-influenced inputs. All eight workspace pins and Cargo.lock move together; no API changed, so nothing downstream needed adjusting.
3 participants
Issue being fixed or feature implemented
WalletConflictSweep::retain_unclaimed(added in #962) rescans every account's every transaction record's every input once per released outpoint, making a sweepO(released × retained history).Neither factor is bounded by anything the wallet controls. A peer can hand the wallet a transaction whose input vector is as large as it likes and whose output pays an address the wallet owns; a later final transaction need conflict with only one of those inputs for all the others to become release candidates. The retained history is simply whatever the wallet has kept. Against a populated wallet that is tens of millions of input comparisons — run while the manager holds the winner mutably, before
TransactionsSweptcan reach a consumer at all.Reported during review of dashpay/platform#4406, which pins this crate.
What was done?
Collect the claimed inputs into one
HashSet<OutPoint>and retain candidates by hashed lookup: one pass over the history plusO(released)lookups.This is what the function did when #962 was first written. It was inverted during that PR's review to avoid allocating a set "to check usually 0–2 candidates" — but a single candidate already costs a full pass over the history under the per-candidate form, so the set was never the worse trade, and the premise that the candidate count is small does not hold.
No behaviour change: same inputs withheld, same inputs released.
How Has This Been Tested?
cargo test -p key-wallet --lib— 661 passed.a_large_release_set_against_a_large_history_is_partitioned_correctly: 8000 candidates against a 4000-record history, asserting the claimed half is withheld and the unclaimed half survives. Under the previous form the same case is 16 million input comparisons.test_a_released_outpoint_another_account_still_claims_is_withheld) still passes, which is what pins the behaviour itself.cargo fmt --all -- --checkandcargo clippy -p key-wallet --all-targetsclean.Breaking Changes
None.
Checklist:
For repository code-owners and collaborators only
Summary by CodeRabbit
Performance
Bug Fixes
Tests