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test: cover promote.rs's budget/render/deadline/overloaded refusal branches - #668

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promote-refusal-branches-627
Aug 15, 2026
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test: cover promote.rs's budget/render/deadline/overloaded refusal branches#668
t0k0sh1 merged 5 commits into
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promote-refusal-branches-627

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@t0k0sh1 t0k0sh1 commented Aug 15, 2026

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Summary

Part of #627 (issue #537 audit series item 8), covering src/api/promote.rs's untested refusal branches:

  • budget_refusal — the per-batch deadline check mid-apply-loop (a resumable-prefix 408, distinct from deadline_exceeded's top-of-handler check).
  • render_refusal's Timeout arm — the deadline dying inside export::render itself, after export_context already succeeded but before the apply loop even starts, so nothing has been written. The Conflict arm stays untested: the code's own comment says the reserved-id refusal earlier in the handler leaves the deadline as render's only reachable error, making Conflict structurally unreachable through the public API.
  • audit_skip_reason's deadline_exceeded — a destination vocabulary large enough (reusing the posting-list-sweep technique from aliases/associations/coverage/vocabularyのテスト空白 #626's vocabulary.rs) that merge_section's lexical twin sweep alone outlasts the request budget, degrading the audit after every batch above is already durable.
  • audit_skip_reason's overloaded — a concurrent promotion holding the only TAGURU_MAX_CONCURRENT_HEAVY_OPS permit during its own slow audit, so a second concurrent promotion's try_acquire degrades instead of shedding its already-applied write.

Scoped out (documented per the pattern established in #626): metadata_unreadable and no_context (both non-audit_skip_reason arms inside landing_audit). apply_batch (src/ingest/rejection.rs:564) unconditionally calls retract_source_unmarked on the destination's whole passage store for every batch, regardless of whether the batch carries passage content — so a corrupted or vanished destination always fails the WRITE phase first (500, or NoContext mid-loop), before landing_audit is ever reached. Confirmed empirically (both with and without the promoted batch itself carrying passage content, to rule out the code's own "self-heals" comment applying here).

Follows #667 (resolve.rs's semantic verdicts and provider-degrade paths), the first PR in this issue's series.

Test plan

  • cargo fmt
  • cargo clippy --all-targets --locked -- -D warnings
  • cargo nextest run --locked (3797 passed)
  • cargo test --doc --locked
  • Diff-scoped mutation gate: test-only diff, No mutants to filter
  • Each new test run 2-3x consecutively to rule out flakiness (the overloaded test spawns two real concurrent threads)

https://claude.ai/code/session_0198T2iKZ17g3tt2bdNq1ju8

Summary by CodeRabbit

  • テスト
    • プロモーション処理のタイムアウト時に、適用済みの変更が正しく保持されることを検証するテストを追加しました。
    • 適用前のタイムアウトで不要な書き込みが発生しないことを確認します。
    • 高負荷時に監査処理を適切にスキップしつつ、必要な変更を保持できることを検証します。
    • 大規模な入力や複数処理の同時実行を想定したテストケースを拡充しました。

…anches

Refs #627

- budget_refusal (per-batch deadline check mid-apply-loop)
- render_refusal's Timeout arm (deadline dying inside export::render,
  before the apply loop even starts)
- audit_skip_reason's deadline_exceeded (destination vocabulary large
  enough to make the lexical twin sweep outlast the budget)
- audit_skip_reason's overloaded (a concurrent promotion holding the
  only TAGURU_MAX_CONCURRENT_HEAVY_OPS permit)

metadata_unreadable and no_context are scoped out: apply_batch
unconditionally retracts the destination's whole passage store on
every batch, so a corrupted/vanished destination always fails the
WRITE phase before landing_audit is ever reached — confirmed
empirically, both with and without the promoted batch itself carrying
passage content.
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📝 Walkthrough

Walkthrough

プロモーションAPIのテストに、複数バッチ適用時の予算超過、監査期限超過、レンダリングタイムアウト、監査の同時実行上限を追加した。各テストは、HTTP応答、永続化されたバッチ、監査結果を検証する。

Changes

プロモーションのタイムアウトおよび監査

Layer / File(s) Summary
テストデータ生成
tests/http_api/promote.rs
高密度な語彙と指定数の一意なソースを生成するヘルパーを追加した。
適用およびレンダリングのタイムアウト
tests/http_api/promote.rs
適用途中の予算超過で 408 と適用済みバッチ数を返す動作を検証する。レンダリング中のタイムアウトでは、適用前の 408 と書き込みなしの状態を検証する。
監査タイムアウトおよび同時実行制限
tests/http_api/promote.rs
監査の期限超過時に適用済みバッチを保持し、deadline_exceeded を返す動作を検証する。同時実行上限時には、両方のバッチを適用し、一方の監査を overloaded としてスキップする動作を検証する。

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🔵 Low · up to 14348

This test-only change adds refusal-branch coverage, but some scenarios depend on fixed scheduling and tight timeout budgets that may cause intermittent failures or miss the intended branch in slower environments. The PR is mergeable with explicit owner awareness and follow-up to make these tests deterministic.

Possibly related PRs

  • t0k0sh1/taguru#517: プロモーションエンドポイントのタイムアウトおよび監査負荷テストの対象となる実装を追加したPR。
  • t0k0sh1/taguru#521: 同じテストファイルで、プロモーションAPIの sources 件数制限を検証したPR。
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✅ Passed checks (5 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed タイトルは、budget、render、deadline、overloaded の拒否分岐を対象とするテスト追加を明確に示しており、変更内容と一致します。
Docstring Coverage ✅ Passed Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
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Actionable comments posted: 1

🧹 Nitpick comments (1)
tests/http_api/promote.rs (1)

845-868: 📐 Maintainability & Code Quality | 🔵 Trivial | 💤 Low value

予算超過テストのタイミング依存性を緩和してください。

COUNT = 600TAGURU_REQUEST_TIMEOUT_SECS=1 の組み合わせは、実行環境の速度に依存します。低速な CI では最初のバッチが 1 件も durable にならず landed > 0 が失敗します。高速な環境では全バッチが適用されて 408 になりません。

landed の下限を 0 以上に緩めるか、COUNT を環境変数で調整可能にすると安定します。少なくとも失敗時に landed と経過時間を出力すると、CI での原因調査が容易になります。

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In `@tests/http_api/promote.rs` around lines 845 - 868, Relax the timing-sensitive
assertion in the promotion timeout test around durable_batches: do not require
landed to be greater than zero, while continuing to require it is less than
COUNT when a timeout response is returned. Include landed and elapsed-time
diagnostics in the failure output so CI timing issues are observable.
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Inline comments:
In `@tests/http_api/promote.rs`:
- Around line 1051-1085: Replace the fixed 200ms startup delay and
request-specific audit assertions in this concurrency test with
order-independent checks. Preserve validation that both batches are applied,
then assert that exactly one response has a normal audit object and the other
has a null audit with audit_skipped set to "overloaded", without assuming first
or second acquired the permit.

---

Nitpick comments:
In `@tests/http_api/promote.rs`:
- Around line 845-868: Relax the timing-sensitive assertion in the promotion
timeout test around durable_batches: do not require landed to be greater than
zero, while continuing to require it is less than COUNT when a timeout response
is returned. Include landed and elapsed-time diagnostics in the failure output
so CI timing issues are observable.
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  • tests/http_api/promote.rs

Comment thread tests/http_api/promote.rs Outdated
CI ran the 600-tiny-passage fixture's promote in 824ms, comfortably
inside the 1s budget (824ms/600 batches vs the ~20ms/batch this
machine sees), so the test's expected 408 never fired. Raise batch
count to MAX_MATCH_LIMIT (1000, the request's own ceiling) and give
each passage a few KB of filler so the write itself, not just
per-batch bookkeeping, contributes to the margin.
The single-process, single-timeout design raced two different costs
against the same budget on CI: growing per-chunk seeding cost (which
needs a generous timeout) and render's own cost (which needs a tight
one). Restarting to get a tight timeout for the measured call exposed
a third cost neither test accounted for — a fresh process leaves
`scratch`'s registry entry Cold, and `ensure_hot`'s WAL replay for
this corpus (~10s, uninterruptible: it takes no `Deadline` at all)
then dominates `export_context` itself, tripping
AccessError::DeadlineExceeded before render is ever reached.

Seed on a generous-timeout server, restart onto the tight one, then
spend a throwaway warm-up call (status ignored) paying the cold-load
cost before the timed promote call — matching the warm `export_context`
this test's margin was actually measured against.
The restart+warm-up design still timed out on CI (nextest's 120s
slow-test kill): CI runs this write pattern much slower than local,
and seeding + a ~30s cold-hydrate for 500k distinct associations
blew the budget even before the timed promote call ran.

Reasserting ONE association from the same source many times (rather
than many distinct ones) sidesteps this: the write side does an O(1)
lookup regardless of accumulated count (measured constant at ~150ms
per 10k-item chunk, never growing), so no restart/warm-up is needed
at all — a single generous-enough timeout covers both seeding and the
measured call safely. `export::render`'s own per-count loop still
does the same real work N times over for that one association, and a
budget well under its full-count completion time reliably interrupts
it mid-loop, long before parse_stream is ever reached. Total test
time drops from ~66-90s to ~33s, comfortably under both the "slow"
mark (60s) and the hard kill (120s).
… tests

- budget_refusal_cuts_a_multi_batch_promotion_short: drop the
  landed > 0 requirement (a CI machine slow enough that not even the
  first batch lands within the 1s budget is still a valid, if
  maximally early, resumable-prefix outcome) and surface elapsed
  time + landed count in the failure message for diagnosability.
- audit_degrades_to_overloaded_when_a_concurrent_promotion_holds_the_
  only_heavy_ops_permit: the 200ms head start makes the first request
  the LIKELY permit holder but not a guaranteed one — assert the
  actual invariant (exactly one of the two responses degrades to
  "overloaded", exactly one carries a real audit) instead of pinning
  which specific request wins the race.
@t0k0sh1
t0k0sh1 merged commit b7d68b5 into main Aug 15, 2026
15 checks passed
@t0k0sh1
t0k0sh1 deleted the promote-refusal-branches-627 branch August 15, 2026 10:28
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