test: replace the MinIO container with an S3 server on Bun.serve - #44054
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Add test/packages/s3-server, an Amazon S3 compatible server that runs on Bun.serve and keeps its data in memory. It verifies AWS Signature Version 4 for the Authorization header, presigned URLs, aws-chunked bodies and POST forms. It has the bucket, object, multipart and list operations of the S3 API, with versioning, ACLs, bucket policies, CORS, tagging, checksums and object lock. test/js/bun/s3/s3.test.ts starts it as a child process in place of the MinIO container. Its tests need no Docker and run on each platform. Remove the minio service from docker compose, the docker helper, the prestart map and the harness.
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository: oven-sh/bun/.coderabbit.yaml Review profile: ASSERTIVE Plan: Essentials Run ID: 📒 Files selected for processing (8)
Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 1 remain after this review. WalkthroughAdds an in-memory S3-compatible server with request signing, storage, authorization, and S3 operation handling. Adds protocol and integration tests. Updates S3 tests to use the local server and removes the MinIO Docker service. ChangesS3 test server
Priority: ➖ Normal Merge Risk: ⚪ Minimal · up to The local S3 server replaces the unavailable MinIO dependency, with no established issue requiring a fix before merge. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@test/packages/s3-server/src/server.ts`:
- Around line 271-273: Update the server disposal path around Symbol.dispose so
disposal waits for stop() to finish before returning; align it with the async
disposal pattern documented in index.ts and prevent callers from selecting a
synchronous, non-waiting shutdown path.
In `@test/packages/s3-server/src/spawn.ts`:
- Around line 58-65: Update spawnServer to terminate the child process if
parsing the startup JSON fails, then rethrow the parse error. Keep the existing
startup behavior unchanged when parsing succeeds.
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scripts/runner.node.tstest/README.mdtest/docker/README.mdtest/docker/docker-compose.ymltest/docker/index.tstest/docker/prestart-map.mjstest/harness.tstest/js/bun/s3/s3.test.tstest/packages/s3-server/cli.tstest/packages/s3-server/index.tstest/packages/s3-server/package.jsontest/packages/s3-server/src/acl.tstest/packages/s3-server/src/authorize.tstest/packages/s3-server/src/body.tstest/packages/s3-server/src/checksums.tstest/packages/s3-server/src/client.tstest/packages/s3-server/src/context.tstest/packages/s3-server/src/cors.tstest/packages/s3-server/src/encoding.tstest/packages/s3-server/src/errors.tstest/packages/s3-server/src/handlers/bucket.tstest/packages/s3-server/src/handlers/common.tstest/packages/s3-server/src/handlers/list.tstest/packages/s3-server/src/handlers/multipart.tstest/packages/s3-server/src/handlers/object-config.tstest/packages/s3-server/src/handlers/object.tstest/packages/s3-server/src/handlers/post-object.tstest/packages/s3-server/src/metadata.tstest/packages/s3-server/src/policy.tstest/packages/s3-server/src/router.tstest/packages/s3-server/src/server.tstest/packages/s3-server/src/signature.tstest/packages/s3-server/src/spawn.tstest/packages/s3-server/src/store.tstest/packages/s3-server/src/xml.tstest/packages/s3-server/test/access.test.tstest/packages/s3-server/test/auth.test.tstest/packages/s3-server/test/bucket.test.tstest/packages/s3-server/test/cors.test.tstest/packages/s3-server/test/helpers.tstest/packages/s3-server/test/list.test.tstest/packages/s3-server/test/multipart.test.tstest/packages/s3-server/test/object.test.tstest/packages/s3-server/test/policy.test.tstest/packages/s3-server/test/post-object.test.tstest/packages/s3-server/test/server.test.tstest/packages/s3-server/test/versioning.test.tstest/tsconfig.json
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- test/docker/docker-compose.yml
- test/docker/prestart-map.mjs
- test/harness.ts
- test/docker/index.ts
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…ne for the start - The server answers 301 PermanentRedirect for a bucket in another region than its endpoint, and it looks at the region before the signature. s3.test.ts uses such a bucket for its redirect test, so the test needs no internet for this server. - spawnServer() has a deadline for the start and stops the child process when the start fails. - The program sends the common requests to a second server before it reports its address, so that the first requests of a test are not slow in a debug build. - S3Server has only the asynchronous disposer. - The tests of stop() ask if the S3 server answers, which stays correct when another program gets the port. - A debug build skips the two tests that move documents of 1000 keys.
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Inline comments:
In `@test/packages/s3-server/cli.ts`:
- Around line 68-71: Update the bucket parsing in the `values.bucket.map`
callback to reject an empty region and avoid silently discarding extra
`@`-separated parts. Preserve values without `@` as buckets with no explicit
region, and parse explicit regions without losing malformed input.
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test/js/bun/s3/s3.test.tstest/packages/s3-server/cli.tstest/packages/s3-server/index.tstest/packages/s3-server/src/errors.tstest/packages/s3-server/src/server.tstest/packages/s3-server/src/spawn.tstest/packages/s3-server/src/warm-up.tstest/packages/s3-server/test/access.test.tstest/packages/s3-server/test/bucket.test.tstest/packages/s3-server/test/helpers.tstest/packages/s3-server/test/list.test.tstest/packages/s3-server/test/object.test.tstest/packages/s3-server/test/server.test.ts
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… region The program took "name@" as a bucket with an empty region. Each request for that bucket then got PermanentRedirect. The program now prints the usage and exits with code 1 for an empty name, an empty region, or more than one "@". createBucket() refuses an empty region.
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Updated 10:26 AM PT - Sep 26th, 2026
✅ @robobun, your commit 827c6075260873efa2deaae1b915455124d5727c passed in 🧪 To try this PR locally: bunx bun-pr 44054That installs a local version of the PR into your bun-44054 --bun |
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
The new commits point the invalid-endpoint test at the local buntest-us-west-1 bucket and add a start deadline to spawnServer(), which addresses the hermeticity and hang concerns from the earlier pass. Beyond the inline findings, I also checked whether CreateBucket with a LocationConstraint on a default (us-east-1) server strands the bucket behind 301 PermanentRedirect for every later request — it does, but that mirrors the real us-east-1 endpoint, which creates buckets in any region that only the regional endpoint then serves, and the package documents that it is a single endpoint.
Extended reasoning...
Findings-present note: the only extra candidate examined was the region-redirect path in test/packages/s3-server/src/server.ts:383 combined with bucketLocation in handlers/bucket.ts:102, which was ruled out as intended S3 behaviour rather than a defect.
…eaders for a refused signature The region rule had its own test for CreateBucket. A CreateBucket request with query parameters for a bucket of another region got PermanentRedirect and not the 409 of the operation. The rule now gets the operation from the router. A preflight request for a bucket of another region gets PermanentRedirect, as each other request for that bucket does. The endpoint of another region does not have the CORS configuration of the bucket. The server finds the bucket of a request before it looks at the signature. A response to a request with a signature that the server refuses gets the CORS headers of that bucket. The request log has the bucket and the key of such a request.
…ck the region in s3.test.ts Bun.serve turns on SO_REUSEPORT for `development: false`. A second server on the same port got a part of the requests. The server now passes `reusePort: false`, and the second server gets EADDRINUSE. The program prints the error of the start without a stack trace. spawnServer() does not keep the process of the caller alive. Before, a program that did not call stop() did not exit. The server stops when its stdin closes. s3.test.ts starts the server with the region us-east-1 and has the region in its options. The server refuses a signature for another region.
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I re-reviewed the two commits since my last pass and found no new bugs; given this adds an ~18k-line S3 emulation (including SigV4 verification) as shared test infrastructure and removes the MinIO container from every lane, a maintainer's look at the design choice is still worthwhile.
What was reviewed:
- cf50f11:
isForEachRegionnow derives the operation fromroute(), and CORS headers are taken from the bucket named in the request before authentication, so both earlier nits are addressed; the new access/bucket tests cover the presigned-CreateBucket and refused-signature cases. - 827c607:
reusePort: falseonBun.serve,child.unref()after startup withchild.ref()instop(), and--exit-on-stdin-closewiring in cli.ts; theanswers()helper in server.test.ts now requiresx-amz-request-id, so a stray process on a reused port cannot satisfy it. - s3.test.ts:
regionis threaded intoS3Clientoptions and the env of the spawned fixture; the R2 entry passesregion: undefined, which is unchanged behaviour. - Still in place from earlier threads, for a maintainer to weigh:
setDefaultTimeout(60_000)underisDebugin test/packages/s3-server/test/helpers.ts:20.
Extended reasoning...
The diff replaces the MinIO docker service with a new in-repo Bun.serve S3-compatible server under test/packages/s3-server (SigV4 header/presigned/chunked verification, router, in-memory store with versioning and multipart, ~25 modules and 12 test files) and rewires test/js/bun/s3/s3.test.ts, test/docker, harness.ts and tsconfig paths to it. The only security-relevant surface is the signature verification, which is test-only and never shipped in Bun. The two commits since the prior review address the nits raised then, and no new defects were found this run. Approval is withheld because of the size and the infrastructure design decision (an emulation replacing a real S3 implementation across all CI lanes), which a maintainer should own.
This was referenced Sep 27, 2026
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…h#42116) ### Problem - `new Response(p.body, p)` adopted a JS-backed stream but pulled the Blob out of a blob-backed one (`Value::from_js`): `p` came out locked and used, and `r.body !== p.body`. - After `text()`/`json()`/`blob()`/... the body's stream was unlocked and `getReader()` worked. undici and Chromium keep it locked. - Zero-length string/`Uint8Array` bodies were never used up: `blob()` left `bodyUsed` false, and `.body` handed out a stream the body did not track. ### Fix - `Value::from_js` adopts every stream. `to_blob_if_possible` still lifts a blob/file-backed stream back into a blob when the body is consumed, served, or uploaded, so the Content-Length framing stays. - New `m_consumedAsBody` bit on `JSReadableStream`, part of `nativeHandleDetached()` and so of `isReadableStreamLocked()`. `set_promise` sets it once the consumer has started, `to_any_blob` after taking a native source's bytes. `Bun.readableStreamToText()` is unchanged. - `.body` on `Empty` stores its stream like the other arms, `use_()` marks `Empty` used, `to_any_blob` turns a closed never-read stream into an empty blob, the getters reject a locked stream up front, and `Response.redirect()`/`error()` get a null body. - Verified: `test/js/web/fetch/body.test.ts` (145 new cases, 128 fail on 1.4.3, all checked against node v26.3.0), plus the suites in Notes. Self-reviewed: 4 concerns, 3 addressed, the oven-sh#33461 overlap is noted below. ### Background - A body is a `Body::Value`: string, `Blob`, bytes, `Empty`, `Null`, or `Locked` (a stream). Reading `.body` makes a non-null body `Locked`. - Blob- and file-backed streams keep a native source. Until something reads them, `to_any_blob` can take the payload back without running the stream. The fetch spec reads a body through a reader it never releases, so a consumed body's stream stays disturbed and locked. <details><summary>Notes</summary> - Ledger members: oven-sh#44053 (eager transfer), oven-sh#44054 and #44171 (unlocked after consume, JS-stream close and error paths), oven-sh#44055 (zero-length bodies). Not in this PR: oven-sh#44057 is covered by oven-sh#33499, and the "`getReader()` alone marks a native body used" cascade (oven-sh#921) by oven-sh#33461. oven-sh#44059, oven-sh#44060 and oven-sh#44061 are separate mechanisms. - Overlap with oven-sh#33461: both touch the body getter prologues, `ReadableStream::to_any_blob`'s guard and `Value::from_js`. If this lands first, oven-sh#33461 keeps its `m_nativeSourceMaterialized` gating and drops its getter and `from_js` hunks on rebase. `to_any_blob` then wants `is_native_source_consumed || is_locked` as its guard. - `ReadableStream__detach`/`force_detach` had no other caller and is removed. `m_consumedAsBody` takes over both halves of what the `-1` handle sentinel did there: the stream reads as locked, and its native handle is neither started by `getReader()` nor handed to `Readable.fromWeb()`'s fast path. Unlike the sentinel it leaves `m_nativePtr` alone, so the handle stays rooted while an async consumer runs. - `Readable.fromWeb()` now throws `ERR_INVALID_STATE` for any locked stream before it does anything else, as Node does (Node acquires the reader at that point). Before, a locked native-backed stream had its handle taken anyway. - `ReadableStream__isClosedUnread`: `ReadableStream{Default,Byte}ControllerClose` only moves a stream to `Closed` once its queue is empty, so `Closed && !disturbed && !locked` means the stream can never yield a byte. This keeps a touched empty body (`new Response(""); r.body`) framing and typing exactly like an untouched one, and `new Response(new Blob([]))` takes the same path. - A locked (not disturbed) body stream now rejects from the getter with `TypeError: Invalid state: ReadableStream is locked`, the same error the C++ helper produced before, and no longer records a pending read first. For JS-stream bodies `getReader(); releaseLock(); await r.text()` works and `bodyUsed` stays false while only locked, as in undici. Native-backed bodies still mark themselves disturbed on `getReader()`; that is oven-sh#33461's subject. - `fetch()` upload framing: a blob/bytes-backed or closed-empty stream body goes out with a Content-Length (as 1.4.3 did for the blob case through the eager transfer, and as undici does for bodies whose source it knows). A file-backed stream keeps streaming chunked, as today, because its length may not be knowable (FIFO, device). A JS stream streams chunked. - `Response.redirect()`, `Response.error()` and the S3 `new Response(s3file)` redirect used `Value::Empty`. The spec body is null. With `Empty` now tracked like any other body they would have become visibly one-shot, so they are `Value::Null` here (the same three-line change sits in oven-sh#33125). - `Bun.readableStreamToText()` and the other helpers on a stream a Body already consumed reject with `ERR_INVALID_STATE` "ReadableStream has already been used" (a stream held by someone else's reader still says "is locked"). `test/js/web/streams/readable-stream-blob-consumed.test.ts` asserted `ERR_BODY_ALREADY_USED` from the old blob-loader path and is updated; its point (no crash, a rejected promise) is unchanged. - Rebased onto oven-sh#42053: its `take_blob_from_unread_stream` used `force_detach`; `to_any_blob` now marks the stream consumed itself. - Suites run on the debug build: `body.test.ts`, `body-stream.test.ts` (9086), `body-clone`, `body-mixin-errors`, `body-async-iterator`, `body-stream-excess`, `serve.test.ts`, `bun-server`, `bun-serve-static`, `bun-serve-file`, `bun-serve-body-json-async`, `serve-if-none-match`, `proxy.test.ts`, `cookie.test.ts`, `html-rewriter.test.js`, `bun-write.test.js`, `spawn-stdin-readable-stream`, `streams.test.js`, `readable-stream-blob-consumed`, `native-source-onclose-leak`, `sync-pull-fast-path`, `request.test.ts`, `response.test.ts`, `client-fetch`, `content-length`, `fetch.stream`, `fetch.test.ts`, `fetch-abort-stream-body`, `fetch-keepalive`, `fetch-backpressure`, `node-stream.test.js`, `direct-readable-stream`, the node `test-readable-from-web-*` files, regression 07001 and 09555. The failures left in `fetch.test.ts`/`serve.test.ts`/`bun-server`/`fetch-backpressure` are environment-only here (IPv6, running as root, no internet or S3 egress, ASAN timeouts, and the ASAN RSS bound in "bounds memory when a handler forwards req.body") and reproduce with `origin/main`'s `src/`. </details>
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Problem
test/js/bun/s3/s3.test.tsfails on each Linux x64 lane of main:Failed to start service minio,failed to resolve reference "quay.io/minio/minio:latest",401 Unauthorized(build 120898). MinIO removed its images.Fix
test/packages/s3-server: an S3 server onBun.servewith no dependencies and the data in memory. It verifies each signature and answers like Amazon S3.s3.test.tsstarts it as a child process with the regionus-east-1. Theminioservice is gone from the docker files andharness.ts.s3.test.tsandtest/packages/s3-server/test/(2056 tests), withbun bd teston Linux x64 and a release build on Windows x64. Also the AWS signature examples and 33 operations of the AWS SDK for JavaScript.Background
s3.test.ts: it would share the thread with the client under test, for 1.3 GiB of uploads.Downsides
Bun.serveremoves.and..path segments, so a key with such a segment cannot be used.Notes
How to use it
serve()runs the server in the process of the test.spawnServer()runscli.tsin a child process. It has a deadline for the start, and the program sends the common requests to a second server before it reports its address. The child process stops when the caller callsstop()or ends.S3Server.fetchis the server as a function. A test can put its ownBun.servein front of it to inject a fault.server.requestshas the operation name, the status and the error code of each request.SigningClientsends signed requests for operations thatBun.S3Clienthas no method for.credentials(more than one account),region,domains,buckets(each with its region, versioning and owner),clock,tls.regionoption the server refuses a signature for another region.s3.test.tsuses it, so each of its requests must sign forus-east-1. The 1537 requests of the file have the same outcomes with and without the option.EADDRINUSE.Operations
NotImplemented.What was verified, and how
123456789.@aws-sdk/client-s3,Uploadof@aws-sdk/lib-storagewith 8 checksum settings,getSignedUrl, andcreatePresignedPost.s3-testssuite gave expected status and error codes.bun bd test, also with the settings of the ASAN lane (BUN_JSC_validateExceptionChecks=1,detect_leaks=1,BUN_DESTRUCT_VM_ON_EXIT=1).s3.test.tspasses underbun bd testwith--timeout=270000, the per-test timeout of the ASAN lane. With the default of 5 s, the two tests that start a debug build of Bun as a child process time out on my machine (5.5 s and 6.5 s, load average above 400).Measurements
s3.test.ts, 307 tests, no R2 credentialstest/packages/s3-server/test/, 2056 testss3.test.tsbun bd(debug, ASAN), machine with a high loadtest/packages/s3-server/test/, 11 filesbun bd, same machines3.test.ts(75 uploads, 645 MiB)test/expected-durations.jsonhas 6.7 s (default), 20.1 s (asan) and 6.4 s (windows) fors3.test.tsbefore this change. The Linux machine of these measurements had a load average above 400, so its wall times are an upper limit.Behaviour that no reference confirms
The server follows Amazon S3 where S3 and MinIO differ. For these cases the references did not agree or had nothing, and the choice is from knowledge of S3:
X-Amz-Expiresout of range is status 400 (s3-testsexpects 403).InvalidChunkSizeErroris status 403.If-None-Matchwith an entity tag on PutObject is 501. 11 tags areBadRequest(s3-tests:InvalidTag). ApartNumberabove the count is 416InvalidPartNumber(s3-tests: 400InvalidPart). A read with the wrong SSE-C key is 403 (s3-tests: 400).Last-Modifiedof the object is the time when the upload started. DeleteBucket removes a bucket that has only uploads in progress.encoding-type=urlwrites a space as+(s3-tests:%20). An empty continuation token isInvalidArgument(s3-tests: a normal list).s3-tests: 200). A grant for an email address is 405. An anonymous ListBuckets is 403, and S3 sends a redirect.multipart/form-datais 412. A checksum field needs a condition in the policy (s3-tests: accepted).PermanentRedirect. A response withPermanentRedirecthas no CORS headers. A request with a signature that the server refuses gets the CORS headers of its bucket.Not implemented
x-amz-*query parameters of a presigned URL are part of the signature. The server does not apply them.PermanentRedirectand no endpoint serves it.Found during this work, not changed here
content-type: application/octet-streamto aBun.serveresponse without a body. A release build does not.src/runtime/server/RequestContext.rs:3821compares the address ofMimeType::OTHER.value, andOTHERis aconst(src/http_types/MimeType.rs:278), so the two addresses are equal only when the optimizer merges them. The tests of the package remove that header (withoutDefaultTypeintest/helpers.ts).Request.urlofBun.servehas no.and..segments.node:httpof Bun gives the path as the client sent it.test/js/bun/s3/s3.test.tshas a test that sends a request tos3.us-west-1.amazonaws.comand expectsPermanentRedirect. It ran for MinIO and for R2. For the new server it now uses a bucket in another region and needs no internet. For R2 it is as before.