fix(api): derive the purchase spend cap from the stored recommendation - #2073
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…n price POST /api/purchases/execute enforced MaxPurchaseAmount, and stamped the execution row and the approval email, from the upfront_cost, monthly_cost and savings the client sent. A purchaser holding execute:purchases with a $1,000 cap could submit upfront_cost: 1 for 100 three-year m5.24xlarge reservations and the provider bought them at list price (audit A01-001). Every rec in the request is now matched against the stored recommendation set on (provider, account, service, region, resource_type, engine, term, payment). Its id, details and cost fields are replaced by the stored row's values scaled by count before the constraint check, the execution row, the approval email and the idempotency key read them. A rec that matches no stored recommendation, or whose stored row carries no usable price, is refused with 409. Retry re-checks the cap against the persisted row, which is now written only from store-derived values. Closes #1905 Co-Authored-By: claude-flow <ruv@ruv.net> Claude-Session: https://claude.ai/code/session_01Fu9uWjxtDFx5HDKeMRt1jC
…accuracy An adversarial review of the stored-price purchase-cap fix found three low-severity gaps, all addressed here without changing the fix's behaviour: - The account component of recIdentityKey was only proven by a pure unit test, not by any handler test, so a regression there could still pass end to end through the real request/scope/pricing pipeline. Added TestHandler_executePurchase_CrossAccountMismatchRefused: stored recommendations exist under one cloud account, the request claims the same resource under a different account, and the handler must refuse with 409 before persisting or contacting the provider. - loadStoredRecommendationIndex silently kept whichever stored row won a map-key collision. The comment claimed migration 000043's unique index rules this out, but that index is case-sensitive on provider and payment while recIdentityKey folds their case, so two rows differing only in case would collide (unreachable today since the scheduler always writes lowercase, but not guaranteed by the schema). This is a money path, so a collision is now refused with an error naming the key instead of picking a row. TestHandler_executePurchase_Success needed a fixture fix: its two stored rows shared one identity tuple and relied on the prior silent-overwrite behaviour to add up to the right total, which the new guard correctly rejects; giving each row a distinct resource_type keeps the same expected totals under a fixture the real store could actually hold. - The OpenAPI description under-listed the fields replaced from the stored recommendation (missing on_demand_cost, purchased, purchase_id and error), reworded to match what priceFromStored actually does. Closes #1905 Co-Authored-By: claude-flow <ruv@ruv.net> Claude-Session: https://claude.ai/code/session_01Fu9uWjxtDFx5HDKeMRt1jC
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📝 WalkthroughWalkthroughThe execute-purchase API now replaces client-supplied recommendation costs with values from matching stored recommendations before applying constraints. It validates identity, pricing, counts, and stored data. The API contract and purchase tests cover the new behavior. ChangesPurchase pricing enforcement
Priority: ⬆️ High — Impact reflects high issue severity. Estimated code review effort: 3 (Moderate) | ~25 minutes Severity of issue fixed: High Merge Risk: 🔵 Low · up to Purchase execution now rejects ambiguous stored recommendations, but the API documentation does not tell clients that duplicate stored recommendation identities can cause this conflict or that refreshing recommendations is the recovery path. Sequence Diagram(s)sequenceDiagram
participant Client
participant PurchaseHandler
participant ConfigStore
participant PermissionConstraints
participant PurchaseExecution
Client->>PurchaseHandler: submit execute purchase request
PurchaseHandler->>ConfigStore: load stored recommendations
ConfigStore-->>PurchaseHandler: return matching stored records
PurchaseHandler->>PermissionConstraints: enforce constraints using stored costs
PermissionConstraints-->>PurchaseHandler: allow or reject request
PurchaseHandler->>PurchaseExecution: persist and execute priced purchase
PurchaseHandler-->>Client: return purchase response
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 79.41% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 34 functions across 6 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@internal/api/handler_purchases_test.go`:
- Around line 2341-2343: Update the request fixtures used by executePurchase
tests so they differ from the invalid stored values: at
internal/api/handler_purchases_test.go lines 2341-2343, use a non-negative
client savings value while retaining the stored negative savings; at lines
2409-2411, use a client upfront_cost below the sanity limit while retaining the
invalid stored cost. Ensure each test isolates validation of the stored value.
In `@internal/api/openapi.yaml`:
- Around line 2854-2856: Update the RecommendationRecord schema to define
nullable cloud_account_id and integer recommended_count properties, matching the
request contract so generated clients can represent account-scoped
recommendations and their recommended counts.
- Line 470: Replace the generic Conflict response reference for
priceRecommendationsFromStore with an operation-specific HTTP 409 response
describing both idempotency-claim conflicts and stored-recommendation conflicts,
including missing, duplicated, unpriceable, and invalid Savings Plan count
cases.
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internal/api/handler_per_account_perms_test.gointernal/api/handler_purchases.gointernal/api/handler_purchases_guards_test.gointernal/api/handler_purchases_test.gointernal/api/openapi.yamlinternal/api/purchase_pricing.gointernal/api/purchase_pricing_test.go
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CodeRabbit flagged three gaps in the #1905 stored-price purchase cap fix: - TestHandler_executePurchase_NegativeSavings and TestHandler_executePurchase_ExceedsMaxAmount submitted client values that were themselves invalid (negative savings, over-cap upfront cost), so both tests would still pass if the handler validated the client's numbers instead of the stored recommendation's. Making the client's values valid while the stored row keeps the invalid value proves the stored value is what actually governs. - The execute-purchase 409 response referenced the shared Conflict component, which documents only the idempotency-claim case. This PR added four more 409 causes (unmatched recommendation, duplicate identity key, unpriceable stored row, Savings Plan count mismatch), so the operation now gets its own 409 description covering both conflict families. - RecommendationRecord was missing cloud_account_id and recommended_count, both of which the stored-recommendation match now depends on, so a generated client could never construct a valid account-scoped request. Co-Authored-By: claude-flow <ruv@ruv.net> Claude-Session: https://claude.ai/code/session_01Fu9uWjxtDFx5HDKeMRt1jC
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All three findings applied in Test fixtures that could pass for the wrong reason. This was the important one and it was right. Both tests submitted a request whose own values were also invalid, so each would still have passed had the handler validated client values rather than stored ones, which is precisely what they exist to disprove. The request now carries valid values ( Verified by reverting the call site so the client's raw values flow through unchanged: both tests then fail, because the now-valid client values pass validation and the handler proceeds into persistence. Restored, both pass. The 409 contract. The execute operation no longer borrows the shared Missing identity fields. CI is green on the new head: 27 checks, no failures. |
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Actionable comments posted: 1
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@internal/api/openapi.yaml`:
- Around line 477-479: Update the OpenAPI 409 response description near the
existing duplicate-identity cases to document that duplicate identity keys in
the stored recommendation set also trigger the conflict, including for requests
containing a single recommendation; instruct clients to refresh the
recommendation set rather than changing a valid selection.
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internal/api/handler_purchases_test.gointernal/api/openapi.yaml
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The 409 description listed duplicate identities in the request but not in the stored set. loadStoredRecommendationIndex refuses two stored rows that share an identity key rather than picking one arbitrarily, and that fires independently of how many recommendations the request carries, including for a single one. The distinction matters to a client: a duplicate in the request is fixed by changing the selection, while a duplicate in the stored set is not the caller's to fix and calls for refreshing the recommendation set or an operator repairing the store. Found by CodeRabbit reviewing 78358f3. Co-Authored-By: claude-flow <ruv@ruv.net> Claude-Session: https://claude.ai/code/session_01Fu9uWjxtDFx5HDKeMRt1jC
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Applied in You are right that the two duplicate cases need distinguishing. A duplicate identity in the request is the caller's to fix by changing the selection; a duplicate in the stored set is not, and calls for refreshing the recommendation set or an operator repairing the store. The description now covers both, and notes that the stored case can fire even for a single-recommendation request, since That guard is new in this PR, added because a review mutation that made the index keep the first row instead of the last survived the whole test suite. It found a real problem on its first run: an existing fixture in |
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What
Closes #1905.
recTotalCommitmentsummed the request's ownupfront_costandmonthly_cost, so theMaxPurchaseAmountconstraint was enforced against a number the purchaser supplies. A user holdingexecute:purchaseswith a $1,000 cap could POSTupfront_cost: 1for 100 three-yearm5.24xlargereservations: the check compared 1 against 1000, passed, and the provider bought at real list price. The same client numbers flowed into the execution row and the approval email, so the audit trail agreed with the request rather than the charge.Every recommendation on the execute route is now re-priced from the stored recommendation before any constraint check, persistence, email or provider call. The client keeps only its selection and count; every other field comes from the store.
Matching by identity tuple, not by id
Recommendations are matched on the eight-field tuple (provider, cloud account, service, region, resource type, engine, term, payment) rather than
rec.ID, because the purchase modal changes term and payment while posting the original id, so an id lookup would fetch the wrong variant. Migration000043's unique index covers exactly those eight columns.Fail-closed, never a fallback
Refusal happens before anything is persisted and before any provider is contacted. The client's numbers are never used as a fallback.
Behaviour changes a maintainer should know
Hand-built API callers. Each submitted recommendation must now correspond to a currently stored one on the eight-field tuple. Invented or stale recommendations get a 409. The web frontend already sends the full server recommendation, so it is unaffected.
GCP recommendations whose billing lookup failed are stored with a zero upfront cost and no monthly cost. They were previously bought unpriced; they are now refused with a 409.
Stored price is the last collected provider price, not a live quote. No provider purchase API accepts a limit price, so this is the strongest server-controlled source available.
Currency is unchanged and still out of scope. Azure stored costs may be in the subscription's billing currency while the cap is USD by convention. This PR does not widen that gap, and it is tracked separately.
Operator step at deploy
This fix does not repair rows that already exist. Executions created before the deploy still carry client-supplied costs. Retry re-checks the cap against those persisted numbers, and no approval path re-checks the cap at all, so a pre-existing row can still be acted on at an understated price. The window is bounded to rows present at deploy time, each of which required retry permission or an approver, but it does not close on its own.
Before approving or retrying anything after this deploys, list
purchase_executionswithcreated_atbefore the deploy timestamp andstatusinpending,notified,scheduledorfailed, comparetotal_upfront_costagainst the current recommendation for the same tuple, and cancel any row whose total is implausible. Pending rows also expire with their approval token.retryPurchaseis deliberately unchanged. After this deploy every writer of the recommendations column stores derived values, and re-pricing at retry would refuse the legitimate re-drive of a partially landed purchase tracked in #1012, because the stored recommendation is evicted at the next collection.Verification
Nine handler-level tests were observed failing on the pre-fix code, each on the real defect: the $1 cost passing a $1,000 cap, twelve provenance assertions showing persisted fields coming from the client, and unmatched, unpriced, zero-count and count-mismatched recommendations all going unrefused. An independent reviewer reproduced that pre-fix run itself in a separate worktree rather than trusting the transcript.
It then ran seven mutations of the fix. Five were caught at handler level. The two that were not are addressed in the second commit:
loadStoredRecommendationIndexsilently overwrote a duplicate key, and its comment claimed the database index made that impossible. It does not: the index is case-sensitive on provider and payment while the key folds case. It now returns an error naming the collision. That guard immediately found a real problem: an existing test fixture had two stored rows sharing one identity tuple, which only passed because of the silent overwrite. The fixture is corrected to give each row a distinct resource type, matching what the real unique index allows.go build ./...,go vet ./internal/api/...go test ./internal/api/...go test ./internal/...gocyclo -over 10on both touched filesThe wrapper in
purchase_pricing.goexists only to keepvalidateExecutePurchaseRequestat the gocyclo limit of 10, which is verified rather than assumed.Summary by CodeRabbit
New Features
409 Conflictresponse for execute-purchase requests.Documentation