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State the contract for counting a spend before one is wired to it #1069

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kwsantiago merged 1 commit into from
Oct 18, 2026
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State the contract for counting a spend before one is wired to it #1069

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17 changes: 17 additions & 0 deletions keep-mobile/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1930,6 +1930,23 @@ impl KeepMobile {
self.policy_read_lock()?.evaluate(&ctx)
}

/// Counts a spend against the velocity limits.
///
/// Call this before the spend completes, and do not complete it when this
/// returns an error. A spend that happened without being counted is one the
/// daily and weekly limits will not see again, so the limits under-count
/// from then on; refusing the spend is the only thing that keeps the
/// counters and reality in agreement. There is no caller yet, so the
/// contract is stated here before one exists rather than inferred later.
Comment on lines +1938 to +1940

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🗄️ Data Integrity & Integration | 🟡 Minor | ⚡ Quick win

Clarify what refusing the spend guarantees.

record_transaction updates the in-memory tracker before persist_velocity runs (keep-mobile/src/policy.rs:746-760; keep-mobile/src/persistence.rs:153-167). If persistence fails and the caller refuses the spend, the tracker still counts a spend that did not complete. Replace “keeps the counters and reality in agreement” with a narrower claim: refusing prevents a completed spend from going uncounted.

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Review comment at @keep-mobile/src/lib.rs around lines 1938 - 1940:
Update the documentation comment near record_transaction to state that refusing
the spend prevents a completed spend from going uncounted; remove the claim that
refusal keeps the counters and reality in agreement.

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review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr

///
/// The count lands in memory first and is persisted second, which is
/// deliberate and the opposite of what the policy record does. A failed
/// write leaves this process counting a spend that storage does not hold,
/// which enforces too strictly rather than too loosely; committing to
/// storage first would leave a failed write counting nothing anywhere, so
/// the live process would under-count immediately instead of only after a
/// restart. Neither ordering makes an uncounted spend safe, which is why
/// the caller has to refuse it.
pub fn record_policy_transaction(&self, amount_sats: u64) -> Result<(), KeepMobileError> {
self.reload_velocity_if_unknown()?;
self.policy_read_lock()?.record_transaction(amount_sats)?;
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