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s3: honor If-Match on DELETE - #1245
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The deleteObject handler loaded the object manifest -- so it had the current ETag -- and then dispatched kv.Del without looking at If-Match. PUT already enforces the header via validateS3PutPreconditions; DELETE accepted it and deleted anyway. Accepting a precondition and ignoring it is worse than not supporting it. A caller that reads an object, decides it is reclaimable, and sends a conditional delete believes the condition protects it from a concurrent rewrite. It did not: the object was removed whatever its current ETag, so the rewrite was silently lost. snapshotoffload retention depends on exactly this -- DeleteObjectIfUnmodified sends If-Match and maps the 412 to ErrObjectModified -- so against the bundled endpoint its precondition was inert and it could reclaim a payload that had been republished after it was observed. The check runs against the manifest the surrounding transaction already loaded at its read timestamp, so the comparison is against the same version the delete will remove rather than a separately-read one that could have moved in between. If-None-Match is deliberately not honoured on DELETE: "only if absent" is meaningless for an operation whose purpose is to remove something that exists, and honouring it would refuse every delete of a present object. Claude-Session: https://claude.ai/code/session_013rNHooj7NF3giihWVba8QE
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📝 Walkthrough
Merge Risk: 🟡 Moderate · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 61.54% 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 Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check タイトルは、DELETEでIf-Matchを適用する主要な変更を正確かつ簡潔に示しています。
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Claude finished @bootjp's task in 20s —— View job Review of #1245: honor If-Match on DELETEI found no blocking issues. I read the diff and the surrounding What I checked
Non-blocking observations
The change follows the CLAUDE.md conventions. The tests are end-to-end through the HTTP handler, and the PR includes a revert-check showing they fail without the fix. This is good to merge from my side. |
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Inline comments:
Review comments at @adapter/s3.go:
- Around line 2793-2794:
既存オブジェクトのETagを検証するIf-Match比較を更新し、引用符を除去した値が「*」なら一致として削除を許可してください。それ以外の値は従来どおりprevious.ETagと比較し、不一致時は既存の前提条件エラーを返してください。
- Around line 2789-2791: Delete 処理の If-Match 検証で、ヘッダーの有無と値を分けて判定してください。If-Match
が存在するのに TrimSpace 後の値が空なら、条件検証を省略せず削除を拒否し、ヘッダーが存在しない場合の既存動作は維持してください。
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adapter/s3.goadapter/s3_conditional_delete_test.go
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🟡 Changes recommended
Valid If-Match: * requests incorrectly receive 412 for existing objects.
1 open finding
What changed in this PR
Adds conditional S3 object deletion using the manifest’s current ETag and existing OCC transaction flow.
Changes:
- Enforces
If-Matchbefore deleting an object. - Adds handler-level and predicate tests for conditional deletion.
| File | Description |
|---|---|
adapter/s3.go |
Validates delete preconditions before dispatching kv.Del. |
adapter/s3_conditional_delete_test.go |
Covers stale, matching, quoted, absent, and unconditional cases. |
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Updated the PR to the current main branch. The conditional DELETE regression tests pass, including stale/matching/quoted ETags, wildcard and multiple validators, absent objects, and unchanged unconditional deletion. PR #1222 now reuses these conditional-delete helpers and will be stacked on this branch so the retention review excludes the shared implementation. @codex review |
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Fixes the third P2 from #1222 ("Make the bundled S3 endpoint honor delete preconditions"), split out because it changes
adapter/s3.gorather thaninternal/snapshotoffload.Behavior change
DELETE /{bucket}/{key}now honorsIf-Match. A request whoseIf-Matchdoes not equal the object's current ETag gets 412 PreconditionFailed and the object is left in place. Requests without the header are unchanged.If-None-Matchis deliberately not honored on DELETE: "only if absent" is meaningless for an operation whose purpose is to remove something that exists, and honoring it would refuse every delete of a present object.Why this matters beyond spec compliance
validateS3PutPreconditionsalready enforcesIf-Matchon the write path.deleteObjectloaded the object manifest — so it had the current ETag in hand — and then dispatchedkv.Delwithout consulting the header.Accepting a precondition and ignoring it is worse than not supporting it. A caller that reads an object, decides it is reclaimable, and sends a conditional delete believes the condition protects it against a concurrent rewrite. It did not: the object was removed whatever its current ETag, so the rewrite was silently lost.
internal/snapshotoffloadretention depends on this directly —DeleteObjectIfUnmodifiedsendsIf-Matchand maps the 412 toErrObjectModified— so against the bundled endpoint that precondition was inert, and retention could reclaim a payload that had been republished after it was observed.The check runs against the manifest the surrounding transaction already loaded at its read timestamp, so it compares against the same version the delete will remove, not a separately-read one that could have moved in between.
Risk
Low, and confined to requests that send a header the endpoint previously ignored:
A client that was sending
If-Matchand relying on the delete happening regardless would now see a 412 — but that client was already relying on a precondition not being enforced, which is the bug.Test evidence
go test ./adapter/ -race -count=1 -timeout 40m—ok 681.541s(the 600s default is not enough for this package under-race)golangci-lint --config=.golangci.yaml run ./adapter/...— 0 issuesTestS3ConditionalDeleteRefusesAStaleETagFAIL ("a delete conditioned on a superseded ETag must fail with 412"); the file restores byte-exact.The end-to-end tests drive the real HTTP handler — PUT, concurrent rewrite, conditional DELETE, then HEAD to confirm the object survived — rather than calling the predicate directly, so they cover the wiring and not just the decision.
TestValidateS3DeletePreconditionscovers the predicate's cases separately.Self-review
retryS3Mutation, so it cannot compare against a version other than the one being deleted. A rewrite landing after the check is handled by the existing OCC retry, the same as before.readTSandstartTSflow through untouched, so MVCC visibility and OCC validation are unchanged. The new 412 is produced before the dispatch, so no partial mutation is possible.If-None-Matchnon-behavior.deleteObjectneeded the mutation body extracted intodispatchConditionalObjectDeleteto stay inside itscyclopbudget; that helper is pure motion plus the new check.