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refactor: promote transaction tolerance semantics to booking as the canonical - #1735
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…anonical The validator's calculate_tolerances (quantum x multiplier per posting, cost/price-inferred accumulation, per-currency default floors) was the only real implementation of the pipeline's balance-tolerance semantics, yet it lived buried in a private validators module while rustledger-booking exported calculate_tolerance — a look-alike primitive with zero production callers that ignores every ledger option. Any new consumer reaching for "the tolerance function" would find the decoy. Move the semantics verbatim into rustledger-booking as transaction_tolerances(txn, &ToleranceOptions), with ToleranceOptions mirroring the three ledger knobs (tolerance_multiplier, infer_tolerance_from_cost, inferred_tolerance_default incl. the "*" wildcard). decimal_quantum moves with it. The validator's calculate_tolerances becomes a thin wrapper wiring ValidationOptions into the canonical, so its behavior and public surface are unchanged. Re-document booking's calculate_tolerance and is_balanced as low-level amount-level primitives that are NOT the pipeline's balancing semantics, pointing at transaction_tolerances — so the decoy can no longer be picked by mistake. Behavior-identical: the existing validator tolerance suite (base quantum, cost-inferred, price-inferred, per-currency floor, wildcard) now exercises the delegation end-to-end and stays green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Pull request overview
Promotes the validator’s transaction balance-tolerance logic into rustledger-booking as a canonical, option-parameterized implementation so all consumers (validator, LSP, embedders, plugins) can share identical tolerance semantics.
Changes:
- Added
ToleranceOptionsplus canonicaltransaction_tolerances()(and moveddecimal_quantum()) intorustledger-booking. - Refactored
rustledger-validate’scalculate_tolerances()to delegate torustledger_booking::transaction_tolerances()usingValidationOptions. - Updated validator tolerance tests to exercise the delegation path (and call the moved
decimal_quantum()).
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| crates/rustledger-validate/src/validators/transaction.rs | Replaces inlined tolerance logic with a thin wrapper delegating to booking’s canonical implementation; adjusts tests accordingly. |
| crates/rustledger-booking/src/lib.rs | Introduces canonical transaction tolerance computation with option knobs; re-documents existing low-level tolerance primitives. |
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📊 Benchmark Results
vs main branch (2026-07-10)
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|
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✅ Compatibility Test Results
What's tested
Full results available in workflow artifacts |
The doc (inherited verbatim from the validator) claimed the per-posting maximum; the implementation has always summed contributions per cost currency and then max'd against the base quantum tolerance. Describe what the code does. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
…eview) The wildcard applies only to currencies appearing as posting UNIT currencies; a currency present only via cost/price inference gets no wildcard floor (a named per-currency default still reaches it). Behavior inherited verbatim from the validator — the doc claimed "all currencies". Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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What
Promotes the pipeline's transaction balance-tolerance semantics into
rustledger-bookingas the canonical, option-parameterized implementation, and defuses the decoy that shadowed it.Why
Phase-1 correctness sweep, tolerance family. The repo had two functions with near-identical names and opposite standing:
rustledger_booking::calculate_tolerance— exported, documented, zero production callers. Uses each amount's fixedinferred_tolerance()and ignores every ledger option (tolerance_multiplier,infer_tolerance_from_cost,inferred_tolerance_default).rustledger_validate::validators::transaction::calculate_tolerances— the real thing (quantum × multiplier per posting, cost/price-inferred accumulation, per-currency floors with"*"wildcard), buried in a private module and unreachable from outside the validator.Any new consumer (embedder, report, plugin) reaching for "the tolerance function" would find the decoy and silently diverge from
rledger check. This is the same drift category as #1648/#1726: a canonical that isn't where consumers look.How
calculate_tolerances+decimal_quantumbodies move verbatim torustledger-bookingastransaction_tolerances(txn, &ToleranceOptions);ToleranceOptionsmirrors the three ledger knobs so the semantics are consumable without aValidationOptionsdependency.calculate_tolerances(txn, &ValidationOptions)keeps its signature and becomes a thin wrapper over the canonical — behavior-identical.calculate_toleranceandis_balancedare re-documented as low-level amount-level primitives that are not the pipeline's balancing semantics, with pointers totransaction_tolerances(kept un-deprecated: booking's own tests/proptests use them legitimately as primitives).Testing
cargo test -p rustledger-booking -p rustledger-validate, clippy--all-features --all-targets -D warnings,cargo fmt --check, andRUSTDOCFLAGS="-D warnings" cargo docall pass.🤖 Generated with Claude Code