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fix(gcp/computeengine): follow every page of the billing SKU listing - #388

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cristim merged 7 commits into
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fix/92-gcp-compute-sku-pages
Oct 13, 2026
Merged

cristim merged 7 commits into
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fix/92-gcp-compute-sku-pages

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@cristim

@cristim cristim commented Oct 13, 2026 •

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What

realBillingService.ListSKUs in Compute Engine read only the first catalog page. The live Compute Engine catalog (services/6F81-5844-456A) is 33,453 SKUs over 7 pages of 5000, so most SKUs, including the commitment SKUs, were never seen. It now goes through the shared skulist.All helper (cap skulist.DefaultMaxPages, error with no partial list on breach) with page size 5000.

Stacked on go#364 (fix/92-gcp-sql-memorystore-sku-pages-and-rec-cap, which adds providers/gcp/internal/skulist); merge #364 first. This is the last call site, so it closes #92. Pricing that consumes the full catalog is go#381; the two are independent.

Fail before, pass after

TestRealBillingService_ListSKUsFollowsEveryPage serves 33,453 SKUs over 7 pages from an httptest server. With the single-call implementation:

--- FAIL: TestRealBillingService_ListSKUsFollowsEveryPage
    "[]" should have 7 item(s), but has 1

After: 33,453 SKUs returned in 7 requests; GOWORK=off go vet/test ./... in providers/gcp passes. The test uses the literal service ID because computeServiceID lives in #381.

Closes #92

🤖 Generated with Claude Code

Summary by CodeRabbit

  • Bug Fixes
    • Compute Engine billing data now includes complete SKU listings, including catalogs that span multiple pages. This helps ensure billing estimates and reports account for all available Compute Engine products rather than only the first portion of a large listing.

cristim and others added 3 commits October 13, 2026 20:49
…mmendations by page

The real billing wrapper read one SKU page and dropped nextPageToken. The
recommender loop compared a per-item counter to maxRecsPages, so more than
20 recommendations hard-errored. Request an explicit page size and cap items
at pages*pageSize; follow nextPageToken for SKUs with a page cap.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…n tests

Add internal/skulist.All (Pages-based, page cap errors instead of returning a
partial list) and use it from cloudsql, memorystore and cloudstorage. Cache the
SKU catalog per client so pricing N recommendations lists it once. Test the
cap, the requested PageSize, the exact-cap boundary and the cache.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
@cristim cristim added priority/p2 Backlog-worthy severity/medium Moderate harm type/bug Defect labels Oct 13, 2026
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Reviewing files that changed from the base of the PR and between fb7dff5 and 3a817e0.

📒 Files selected for processing: 2
  • providers/gcp/services/computeengine/client.go
  • providers/gcp/services/computeengine/paging_test.go
📝 Walkthrough

The Compute Engine billing adapter now retrieves SKU results across pages with a page size of 5,000 and the shared default page cap. A test verifies that the adapter returns 33,453 SKUs in seven requests.

Changes: Compute Engine SKU pagination

Layer / File(s) Summary
Paginated SKU listing and validation
providers/gcp/services/computeengine/client.go, providers/gcp/services/computeengine/paging_test.go
The adapter retains the request context and uses skulist.All to retrieve SKU pages. It wraps pagination errors with the service ID. The test checks that 33,453 SKUs are returned across seven requests.

Priority: ⬆️ High

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: 🔵 Low · up to fb7df

The SKU pagination change is mergeable with bounded follow-up: reduce the test’s construction cost and assert the requested page size so the test protects that behavior.

Pre-merge checks: Passed 4 · Failed 1

Failed Failed checks: 1 warning

Check name Status Explanation Resolution
Docstring Coverage Warning Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed Passed checks: 4 passed
Check name Status Explanation
Description Check Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check Passed The title clearly and concisely describes the main change: updating the Compute Engine billing SKU listing to follow every page.
Linked Issues check Passed Issue #92 requires complete SKU pagination and a page cap that errors without returning partial results. In providers/gcp/services/computeengine/client.go, realBillingService.ListSKUs calls `skuli…
Out of Scope Changes check Passed The changes are limited to Compute Engine SKU pagination and its automated test. The context propagation, shared helper call, page-size constant, and test server directly support issue #92. No unrelat…
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@cristim
cristim changed the base branch from fix/92-gcp-sql-memorystore-sku-pages-and-rec-cap to main October 13, 2026 19:34
@cristim

cristim commented Oct 13, 2026

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Independent review (claude-opus-5-5) of 83f55c3: APPROVE

Reviewed head 83f55c3 (main merged into 737bd94; the diff against main is identical to 737bd94's: client.go +13/-2, new paging_test.go).

Evidence

  • Live catalog, read-only GETs with the gcloud account: services/6F81-5844-456A/skus?pageSize=5000 took 7 requests and returned 33,453 SKUs. Without pageSize the API also returns 5000 per page.
  • Real path end to end: with this PR and go#381 merged locally, realBillingService.ListSKUs against the live API returned 33,453 SKUs and n2-standard-8 in us-central1 priced at 0.244728/h committed (1yr).
  • Fail before: paging_test.go against main's single-call ListSKUs (with only the ctx field dropped from the literal) fails with "[]" should have 7 item(s), but has 1.
  • Mutation: skulist.DefaultMaxPages replaced by 1 is killed by TestRealBillingService_ListSKUsFollowsEveryPage.
  • GOWORK=off go build ./... passes in all five modules; GOWORK=off go vet ./... && go test ./... in providers/gcp pass. CI on 83f55c3: all checks green.

Non-blocking

  1. client.go .PageSize(skuPageSize): deleting it survives the test suite (the fake server ignores pageSize). Harmless today because the live default is 5000; asserting r.URL.Query().Get("pageSize") == "5000" in catalogServer would pin it.
  2. Text conflict with go#381 in the client.go import block (go#381 drops the skumatch import, this PR adds skulist next to it). Whichever lands second resolves it by keeping skulist and dropping skumatch. I resolved it locally that way, and vet and tests pass on the combined tree.
  3. Compute passes the caller's ctx into skulist.All, while Cloud SQL and Memorystore use context.Background(). Compute's choice is the better one. Not worth churn here.

No overlap with go#307 (git merge-tree is clean).

@cristim

cristim commented Oct 13, 2026

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Independent review (claude-opus-5-5) of fb7dff5: APPROVE
Update-branch of the approved 83f55c3: only main's commits came in, as clean merges with no conflict resolution; the PR's own diff content is unchanged; GOWORK=off vet and tests pass in: providers/gcp.

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Actionable comments posted: 1

🧹 Nitpick comments: 1
providers/gcp/services/computeengine/paging_test.go: 1

53-64: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Assert the requested page size.

catalogServer uses its pageSize argument to generate responses, but it ignores the request's pageSize query parameter. The test can pass if .PageSize(skuPageSize) is removed or changed. Record and assert that each request sends pageSize=5000.

Suggested fix
-func catalogServer(t *testing.T, total, pageSize int, tokens *[]string) *httptest.Server {
+func catalogServer(t *testing.T, total, pageSize int, tokens, pageSizes *[]string) *httptest.Server {
 	t.Helper()
 	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		token := r.URL.Query().Get("pageToken")
 		*tokens = append(*tokens, token)
+		*pageSizes = append(*pageSizes, r.URL.Query().Get("pageSize"))
 		start := 0
@@
 	var tokens []string
-	srv := catalogServer(t, 33453, 5000, &tokens)
+	var pageSizes []string
+	srv := catalogServer(t, 33453, 5000, &tokens, &pageSizes)
@@
 	assert.Len(t, resp.Skus, 33453)
 	assert.Len(t, tokens, 7)
+	assert.Len(t, pageSizes, 7)
+	for _, pageSize := range pageSizes {
+		assert.Equal(t, "5000", pageSize)
+	}
 }
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Review comment at @providers/gcp/services/computeengine/paging_test.go around
lines 53 - 64:
Update TestRealBillingService_ListSKUsFollowsEveryPage and catalogServer to
record the pageSize query parameter on each request, then assert that all seven
requests send pageSize=5000. Keep the existing pagination and SKU-count
assertions.

  • 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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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:
Review comments at @providers/gcp/services/computeengine/paging_test.go:
- Line 34: Replace repeated string concatenation in the synthetic SKU response
generation with a strings.Builder or incremental writes to the response writer,
preserving the existing JSON structure and seven-page test behavior.

---

Nitpick comments:
Review comments at @providers/gcp/services/computeengine/paging_test.go:
- Around line 53-64: Update TestRealBillingService_ListSKUsFollowsEveryPage and
catalogServer to record the pageSize query parameter on each request, then
assert that all seven requests send pageSize=5000. Keep the existing pagination
and SKU-count assertions.

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📒 Files selected for processing: 2
  • providers/gcp/services/computeengine/client.go
  • providers/gcp/services/computeengine/paging_test.go

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Comment thread providers/gcp/services/computeengine/paging_test.go Outdated
@cristim

cristim commented Oct 13, 2026

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Independent review (claude-opus-5-5) of 3a817e0: APPROVE
Covers go#388 after the CodeRabbit fix: compared with the approved 83f55c3 and my update-branch verdict on fb7dff5, the only non-main change is d88cb8a (providers/gcp/services/computeengine/paging_test.go builds the synthetic catalog response with strings.Builder; same output, test-only), then a clean update-branch merge of main with no conflict resolution; CI was green on d88cb8a; GOWORK=off vet and tests pass in: providers/gcp.

@cristim
cristim merged commit 7eaf9c5 into main Oct 13, 2026
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fix(gcp): billing SKU listing reads one page and drops the NextPageToken

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