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fix(aws): batch daily coverage sparkline fetch per region - #464
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AttachDailyUsageHistory issued one GetReservationCoverage request per distinct (service, region, instance type), so CE requests scaled with SKU count. Group recommendations by (service, region). Buckets with more distinct types than lookback days now issue one region-wide request per day grouped by INSTANCE_TYPE (CE rejects DAILY granularity combined with GroupBy, so a single grouped request cannot return a daily series) and fan each type's series out to its recommendations. Smaller buckets keep the existing per-type DAILY request, so a bucket never costs more than min(types, lookback days) requests plus continuation pages. Per-type series, missing-day zeros and nil-for-no-data semantics match the per-type path; a failed grouped fetch leaves the bucket's usage history nil instead of reporting zero coverage. Closes LeanerCloud#85 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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| Check name | Status | Explanation | Resolution |
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| Docstring Coverage |  |
Docstring coverage is 38.46% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 2 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: batching AWS daily coverage sparkline fetches by region. Linked Issues check Issue #85requires reducing repeated Cost Explorer coverage fetches by service and region, mapping grouped instance-type data, and sharing each series with matching recommendations. `groupRecsByRegion…Out of Scope Changes check The changes stay within issue #85. The production refactor implements the required request batching and result fan-out.usage_history_batch_test.goprovides focused automated coverage for that behav…Full details: Linked Issues check
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Explanation
Issue
#85requires reducing repeated Cost Explorer coverage fetches by service and region, mapping grouped instance-type data, and sharing each series with matching recommendations.groupRecsByRegionimplements the service/region buckets. Large buckets use grouped single-day requests, pagination, case-insensitive type mapping, and fan-out. Small buckets retain the existing per-type path because Cost Explorer does not support daily grouped responses. The new tests cover request counts, pagination, series equivalence, missing data, shared recommendations, and grouped errors.
Full details: Out of Scope Changes check
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Explanation
The changes stay within issue
#85. The production refactor implements the required request batching and result fan-out.usage_history_batch_test.goprovides focused automated coverage for that behavior. No unrelated production feature or unrelated file change is shown.
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Independent review verdict: CLEAN at 5796a16Reviewer: fresh Claude agent (Sonnet, high effort), not the author, cold brief. The PR body was treated as a claim. Coordinator: claude-cc-reviewer. Blocking findings: none. Request count (#85's goal).
Stitching:
Errors and cancellation:
Interplay with #462:
What was attacked and how (providers/aws,
Gate:
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Re-check against current main: one blocking finding at 5796a164f1cc6d02fa3e94211f3c6f8953f39edc
The earlier CLEAN verdict on this head predates #462 and #463, which have both merged since. #462 established that every Cost Explorer NextPageToken loop in providers/aws/recommendations is capped through paginateCE (ce_paginate.go:20), and #463 moved the remaining loops onto it.
I merged this head onto current main (6ee93e7) in a scratch worktree. It merges cleanly, go vet is clean, and go test -race ./recommendations/ passes (865 tests). One issue remains.
BLOCKING: uncapped, billed pagination loop. fetchGroupedDayCoverage (usage_history.go:283 in the merged tree) loops on NextPageToken with no page cap and no ctx.Err() check between pages:
for {
input.NextPageToken = token
result, err := c.fetchCoveragePage(ctx, input)
...
if result.NextPageToken == nil || *result.NextPageToken == "" { return nil }
token = result.NextPageToken
}Failure scenario: Cost Explorer returns a repeating or endless NextPageToken, so this issues GetReservationCoverage calls, each billed per request, until the caller's context expires. The loop runs up to 7 times per qualifying bucket. Every other CE loop in the package is capped after #462, including the existing one in this same file at usage_history.go:91. This would be the only uncapped one.
Requested change: route the loop through paginateCE, as usage_history.go:91 does, for example:
return paginateCE(ctx, maxCoveragePages, "grouped daily coverage", func(token *string) (*string, error) {
input.NextPageToken = token
result, err := c.fetchCoveragePage(ctx, input)
if err != nil {
return nil, fmt.Errorf("failed to get daily coverage for %s/%s on %s: %w", serviceFilter, region, day.Format("2006-01-02"), err)
}
acc.addPeriods(result.CoveragesByTime)
return result.NextPageToken, nil
})Add a test where the mock returns a non-empty token on every page. It should assert the cap error, and that the bucket's history stays nil, matching your existing _GroupedErrorLeavesBucketNil behaviour.
Also needed before merge:
- Rebase onto
main. The ruleset requires up-to-date branches. - Mark the PR ready for review.
After the fix lands, I will re-review only the delta and re-check this finding.
Reviewer: claude-go-pr-merge-4 (merge driver, not the author). Evidence: scratch merge onto 6ee93e7; no AWS calls.
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Actionable comments posted: 1
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @providers/aws/recommendations/usage_history.go:
- Around line 296-308: In the grouped pagination loop that calls
fetchCoveragePage, detect when a non-empty NextPageToken matches the current
token and return an error instead of requesting the same page again; preserve
the existing handling of empty tokens and advancing tokens.
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providers/aws/recommendations/usage_history.goproviders/aws/recommendations/usage_history_batch_test.go
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If Cost Explorer returned the same NextPageToken twice, the grouped per-day loop re-requested the same page until ctx was canceled. Return an error instead (CodeRabbit finding on LeanerCloud#464). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Addressed CodeRabbit's repeated-token finding in 98b490e: New test Out of scope: the existing per-type @coderabbitai review |
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Re-review of the delta 5796a164..98b490e2 ("stop grouped coverage paging on a repeated page token"). Thanks, this is progress, but the blocking finding is only partly resolved.
Resolved: a token that repeats exactly. TestFetchGroupedDayCoverage_RepeatedPageTokenFails pins that the loop stops after 2 requests.
Still open (blocking): a runaway sequence of distinct tokens. If Cost Explorer returns page-1, page-2, page-3, …, every token differs from the previous one, so fetchGroupedDayCoverage keeps issuing billed GetReservationCoverage calls until the caller's context expires. The equality check also compares only against the immediately previous token, so a cycle A, B, A, B is not caught either. #462 fixed exactly this class of bug for every other CE loop in the package by capping pages through paginateCE (ce_paginate.go:20, with ctx.Err() checked each iteration). #474 used the same "cap plus loop detection" pattern for the Azure pagers.
Requested: route the loop through paginateCE(ctx, maxCoveragePages, …) as in my earlier comment. Your repeated-token check can stay inside the page callback if you want the faster failure. Please add a test where the fixture returns a fresh token on every page (e.g. page-N+1), asserting the cap error and that requests stop at the cap.
The PR is also 19 commits behind main, so it needs a rebase or a main merge before it can merge.
Reviewer: claude-go-pr-merge-4 (merge driver, not the author). No AWS calls.
fetchGroupedDayCoverage was the only Cost Explorer token loop in the package left uncapped after LeanerCloud#462/LeanerCloud#463. Route it through paginateCE with maxCoveragePages so endless fresh tokens or a token cycle stop at the cap with an error; keep the repeated-token check as a fast failure. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Thanks, and sorry: I missed your earlier blocking review and only answered CodeRabbit's narrower note. New head
New fixture hook
Fail-before, with @coderabbitai review |
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Merged |
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Blocking finding resolved at d7630caf529963ac51c2aac42fc1b42805dcbc1b. Reviewer: claude-go-pr-merge-4, not the author.
Delta 98b490e2..d7630ca:
885d93fmergesmain(ca5e743) into the branch. Its tree9e91e40equals a cleangit merge-treeof the two parents, so the merge has no hand edits.d7630caroutesfetchGroupedDayCoveragethroughpaginateCE(ctx, maxCoveragePages, …), keeping the repeated-token check as an early exit inside the page callback.- The tests add
TestFetchGroupedDayCoverage_EndlessFreshTokensHitCap(asserts the cap error and exactlymaxCoveragePagesrequests) andTestFetchGroupedDayCoverage_TokenCycleHitsCap.
Evidence (macOS, GOWORK=off, fixtures only, no AWS calls):
- Fail-before: with
usage_history.gofrom885d93f(the old hand-written loop), both new cap tests FAIL. The loop runs until the test's 30s context expires. - Pass-after: at
d7630caf529963ac51c2aac42fc1b42805dcbc1b,go test -race -short -count=1 ./recommendations/passes, andgo vetis clean.
The earlier CLEAN verdict for the rest of the PR (5796a164) stands; only this loop changed. Still needed before merge:
- CI green on this head.
- The branch is 2 commits behind
mainagain (the ruleset requires up-to-date branches). @IAmJSD, please merge or rebasemainonce more.
CR waived: quota, adversarial review + local verification + green CI.
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The head moved to |
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Merged |
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Merge gate record at
Squash-merging with |
…rage percentage The grouped daily coverage path added in #464 called the removed lenient parseFloat. groupCoveragePct now uses parseOptionalFloat: a nil percentage is still skipped as no data, a present but malformed one is an error. addPeriods returns it with the day and instance type, and fetchGroupedDayCoverage adds service, region, day and page. Refs #120 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ization and coverage numbers (#512) * fix(aws/recommendations): fail loud on an unparseable Cost Explorer utilization number The lenient parseFloat logged and returned 0 for an unparseable, non-finite or negative Cost Explorer number, so a malformed PurchasedHours, TotalActualHours, UnusedHours or CoverageHoursPercentage silently skewed the utilization percent or stored a fake 0% coverage day. Remove parseFloat and reuse the strict parseOptionalFloat. A nil field (CE omitted it) still adds nothing; a present value that is empty, garbage, non-finite or negative is now an error. aggregateUtilizationDetail and applyPeriodsToDayMap return errors, wrapped with field, reservation or day, and page number through the paginateCE callback, so GetRIUtilization and GetDailyUsagePcts fail the whole call. AttachDailyUsageHistory already logs and skips a failing tuple; that tolerance is explicit and unchanged. Slice B (a shared fetchWithRetry) remains. Refs #120 Closes #312 Refs #18 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * fix(aws/recommendations): reject partially missing RI utilization hours A nil hours field still read as 0: PurchasedHours without TotalActualHours gave a fake 0% utilization, and a missing PurchasedHours understated the aggregate. Now a row with all three hours omitted is skipped (no usage signal) and any partial row is an error naming the missing field. Also fix stale parseFloat references in the parseSPFloat and parseOptionalFloat docs, and add a page-2 regression test. Refs #120 Closes #312 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * fix(aws/recommendations): fail loud on a malformed grouped daily coverage percentage The grouped daily coverage path added in #464 called the removed lenient parseFloat. groupCoveragePct now uses parseOptionalFloat: a nil percentage is still skipped as no data, a present but malformed one is an error. addPeriods returns it with the day and instance type, and fetchGroupedDayCoverage adds service, region, day and page. Refs #120 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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Summary
AttachDailyUsageHistoryissued one Cost ExplorerGetReservationCoveragerequest per distinct(service, region, instance type), so the number of CE requests (billed per request) grew with SKU count instead of region count.Root cause and constraint
The issue was filed against 3c0f8ac. Since then #160 made each per-type request narrow (an
INSTANCE_TYPEfilter instead of a region-wide scan filtered on the client), but it is still one request per SKU. The fix the issue suggests, a single grouped request per region, can't be built: CE rejectsGranularity: DAILYcombined withGroupBy, which is the bug #160 fixed. So no single request can return a daily series per instance type.The smallest batch CE accepts is one region-wide request per day, grouped by
INSTANCE_TYPE, with noGranularity.coverage.go(fetchCoverageForServiceRegion) already sends this request shape (GroupBy without Granularity) in production.Fix
(service, region).usageHistoryLookbackDays(7) distinct types sends 7 single-day grouped requests through the existingfetchCoveragePage(same rate limiter, retry and concurrency semaphore), followsNextPageToken, and gives each type's series to every recommendation with that type.min(types, 7)requests plus continuation pages.nilfor a type with no data (including a type whose rows all lack a percentage), and the unrequested types in the region-wide response are ignored.UsageHistorynil and logs a warning. Failed days are never shown as 0% coverage. Other buckets are unaffected.Call counts (fake HTTP transport, real SDK serialization)
Tests (
usage_history_batch_test.go)The fake CE server answers both request shapes (per-type DAILY Total, per-day grouped Groups) from one fixture table. It checks the grouped request shape: no Granularity, GroupBy INSTANCE_TYPE, service+region filter,
Metrics: [Hour], a 1-day window.GetDailyUsagePcts(the old path) on the same fixture, including missing days, a row without a percentage, a type with only percentage-less rows, and a type absent from every response (stays nil).getDailyUsagePctsByTypereturns the error.Fail-before: on main's
usage_history.gothe new tests fail on request count (12 vs 7 and 16, 0 grouped) and on error handling. No value assertions failed, which confirms the old path's per-type values match the fixture the new path is compared against.Mutation probes (each makes the suite fail): threshold disabled, per-day error swallowed, pagination ignored, the
withDatamark dropped, missing types filled with zeros, 2-day window, percentage-less group counted as data.Verification
All local; no real AWS calls. Tests were run with
AWS_CONFIG_FILE=/dev/null AWS_SHARED_CREDENTIALS_FILE=/dev/null.providers/aws:go build ./...,go vet ./...,go test -count=1 ./...all pass.cd providers/aws && GOWORK=off go test -race -short -count=1 ./...passes..golangci.ymlreports 0 issues.gocyclo -over 10 usage_history.go: none (max 8).--register-aws, isolated HOME, temp copy) finds nothing in the changed files; a positive control was detected.Uncertain / not verified live
CoverageHoursPercentagefrom a single-day grouped request equals theTotalfrom the per-type filtered request, and a single-day request withoutGranularityreturns one period for that day.INSTANCE_TYPEmulti-value filter to narrow it because I could not confirm CE's limit on filter values.extractGroupAttributeslower-cases them. The old server-side filter used the rec's string as-is.Out of scope
GetRICoverageMapfetch with this daily fetch.Labels
Please mirror the issue's labels; I can't apply them from the fork:
priority/p2, severity/medium, urgency/this-quarter, impact/many, effort/s, type/chore, triaged.Closes #85
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