fix: log discarded io::Error under a spent budget, dedupe tags before capping - #640
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…re capping Six call sites answered a timeout instead of the underlying io::Error whenever a passage read failed and the deadline had also expired by the time the result was checked — correct for the client response, but the io::Error itself vanished from the logs too, making a real disk fault indistinguishable from an ordinary budget cut. Each site now logs the recovered error before answering the timeout. source_filter's tag-count cap also checked the raw input length before dedup, so 33 spellings of one tag refused a filter whose stored, deduped shape was well under the cap. The cap now applies after dedup, with a separate MAX_INPUT_ITEMS door in front of it to bound the raw input before sort+dedup ever runs. Refs #620
Adds a shared, test-only fault-injection hook (mirrors api::groups's own expire_fingerprint_loop_after) so the "deadline expired exactly when a passage read's io::Error also surfaced" race is reachable deterministically, combined with a genuine io::Error forced by writing an unparseable snapshot to a context's passages file before its first touch. community_hits' own match arm cannot use the same technique: its io::Error read is the SECOND passage-store touch of one call, sharing a cache with the manifest lookup just above it, so it is extracted into its own #[mutants::skip]'d function instead, following the same pattern api::promote already uses for its own untimeable races. Refs #620
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📝 WalkthroughWalkthrough検索関連APIで、期限切れとI/Oエラーが競合した場合の分類とログ記録を統一しました。 ChangesAPIエラー処理とタグフィルタ
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to The change improves failure logging but currently records raw I/O and render error text that may expose filesystem paths, source identifiers, or user data. Merge should wait until these logs use safe, low-cardinality failure classifications. Sequence Diagram(s)sequenceDiagram
participant SearchHandler
participant PassageStorage
participant Deadline
participant WarningLog
participant ApiResponse
SearchHandler->>PassageStorage: passageを検索する
PassageStorage-->>SearchHandler: I/Oエラー
SearchHandler->>Deadline: 期限を確認する
alt 期限切れ
SearchHandler->>WarningLog: I/Oエラーを記録する
SearchHandler->>ApiResponse: Timeoutを返す
else 期限内
SearchHandler->>ApiResponse: InternalまたはUnreadableを返す
end
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Inline comments:
In `@src/api/sources.rs`:
- Around line 1022-1024: Remove raw error text from telemetry: in
src/api/sources.rs lines 1022-1024, 1520-1522, and 1730-1735, and
src/api/evidence/assemble.rs lines 402-406 and src/api/communities.rs lines
334-338, log only a stable low-cardinality I/O classification such as
io_error.kind(); in src/api/import.rs lines 1081-1083, replace the raw message
with a structured failure reason that excludes source IDs and other user data.
Keep logs free of query, concept, source, path, and passage contents while
preserving existing metric vocabularies.
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📒 Files selected for processing (5)
src/api.rssrc/api/communities.rssrc/api/evidence/assemble.rssrc/api/import.rssrc/api/sources.rs
ADR 0008 §8: "use stable, low-cardinality codes" for logs/telemetry.
io::Error's Display text is neither stable nor bounded (it can vary by
OS/errno and isn't guaranteed free of path fragments), so replace it
with io_error.kind() at all 5 call sites (search_passages,
explain_search_passages, cross_search_passages, community search, and
evidence assembly). Also drop context = %name/%derived from all 5 —
ADR 0008 §8 forbids recording context names on any span, not only via
a field named error.
community_search_io_failure's derived parameter is now unused (it
only ever fed the removed context field) — dropped from the signature
and its call site.
export_response's raw {message} interpolation is replaced with a
reason classification too, though for a narrower reason than the
literal claim behind it: render()'s only two Err(String) shapes are
DeadlineExceeded's fixed Display text and a reserved-id-collision
message that names only the fixed EMPTY_SOURCE constant, never an
actual caller-supplied source id — so no source id was ever at risk
here. Classifying anyway matches this file's own established practice
of stable codes over raw text, and keeps the two shapes (a genuine
mid-render timeout vs. a collision that happened to coincide with one)
distinguishable in the log, which the existing comment above this arm
already calls out as the point of logging at all.
Refs #620
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Summary
deadline_exceededinstead of the underlyingio::Errorwhenever a passage read failed AND the deadline had also expired by the time the result was checked — the right client response, but theio::Erroritself vanished from the logs too, making a real disk fault indistinguishable from an ordinary budget cut. Each site now logs the recovered error before answering the timeout:search_passages,explain_search_passages,cross_search_passages(src/api/sources.rs),community_hits(src/api/communities.rs),assemble_evidence(src/api/evidence/assemble.rs), andexport_response's render-failure race (src/api/import.rs).source_filter's tag-count cap checked the raw input length before dedup, so 33 spellings of one tag refused a filter whose stored, deduped shape was well under the cap. The cap now applies AFTER dedup, withoverlong'sMAX_INPUT_ITEMSdoor in front of it (same helpercross_targetsalready uses) to bound the raw input before sort+dedup ever runs.Findings addressed (issue #620)
Test plan
source_filter: same tag repeated past the cap is accepted (effective filter is 1 tag), exactly-at-the-cap distinct tags is accepted (pins the>boundary), too many distinct tags is refused, an oversized raw list is refused before dedup.api::expire_deadline_race, mirroringapi::groups's ownexpire_fingerprint_loop_after) makes the race deterministic, combined with a corrupted passages snapshot to force a realio::Erroron a context's first passage touch.community_hits' own guard could not use the same technique (its read is the second passage-store touch of one call, sharing a cache with the manifest lookup just above it) — extracted into its own function and#[mutants::skip]'d, following the same patternapi::promotealready uses for its own untimeable races.cargo fmt,cargo clippy --all-targets -- -D warnings,cargo testall green.cargo mutants --in-diff): all mutants caught after 3 iterations (one genuinely-dead-under-cfg(test)mutant skipped with a reason).Refs #620 (part 2 of 3 — remaining findings tracked in a follow-up PR)
Summary by CodeRabbit
バグ修正
改善