fix(node): allow body reads when stream is pre-drained with rawBody - #295
fix(node): allow body reads when stream is pre-drained with rawBody#295koding88 wants to merge 2 commits into
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Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe Node adapter now reads a pre-buffered ChangesNode raw body handling
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to The change allows supported pre-buffered request bodies to be read without altering public APIs or deployment behavior, and no actionable merge-blocking risk remains after normal checks and review. Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Linked Issues checkExplanation The implementation checks the rawBody Buffer before the readableEnded guard, preserves the request body size limit, and adds regression coverage for request.text() and request.json(). These changes satisfy the requirements in [ Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2 files. ✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Pull request overview
This PR fixes a regression in the Node adapter where requests whose Node stream was already fully drained by upstream middleware (but preserved as req.rawBody) would be rejected as “Body is unusable” before the rawBody fast path could be used.
Changes:
- Update
NodeRequest.#readBuffered()to prefer thereq.rawBodyfast path before checking whether the underlying stream is already finished. - Add a regression test intended to cover the pre-drained-with-
rawBodyscenario.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
src/adapters/_node/request.ts |
Moves the rawBody path ahead of the finished-stream guard so pre-drained bodies remain readable. |
test/node-adapters.test.ts |
Adds a regression test for pre-drained request streams with rawBody present. |
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| const server = serve({ | ||
| port: 0, | ||
| async fetch(request) { | ||
| return new Response(await request.text()); | ||
| }, | ||
| }); | ||
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| // Inject connect/express middleware that drains the stream and stores rawBody | ||
| server.node!.server!.on("request", async (req: any) => { | ||
| const chunks: Buffer[] = []; | ||
| for await (const c of req) { | ||
| chunks.push(c); | ||
| } | ||
| req.rawBody = Buffer.concat(chunks); | ||
| }); | ||
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| await server.ready(); | ||
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| const res = await fetch(server.url!, { | ||
| method: "POST", | ||
| body: JSON.stringify({ hello: "world" }), | ||
| }); | ||
| expect(res.status).toBe(200); | ||
| expect(await res.json()).toEqual({ hello: "world" }); | ||
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Actionable comments posted: 2
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Inline comments:
In `@test/node-adapters.test.ts`:
- Around line 750-755: Add a matching test near the existing pre-drained rawBody
test in the serve fetch handler, exercising request.json() after middleware
stores rawBody and asserting the parsed body is returned correctly; reuse an
existing equivalent regression test if present.
- Around line 758-765: Synchronize the pre-drain request listener with the Fetch
handler by creating a promise that resolves after req.rawBody is assigned in the
server.node.server request listener, then await that promise before invoking
fetchHandler(request). Ensure the test’s request.text() path runs only after
rawBody has been populated.
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src/adapters/_node/request.tstest/node-adapters.test.ts
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Summary
Fixes #294
When running behind middleware or hosting environments that pre-drain request streams into a
req.rawBodybuffer (e.g. Google Cloud Functions / Firebase Functions / Express body parsers),req.readableEndedis alreadytruewhen srvx handles the request.In
NodeRequest.#readBuffered(),isBodySourceFinished(this.#req)checksreq.readableEndedand rejects immediately withTypeError: Body is unusable, preventing the execution from reachingreadBody()where thereq.rawBodybuffer is handled.Background
readBody()already supportsrawBodybuffers provided by environments like Cloud Functions:When
rawBodyis present on the incoming request, the body has already been completely received and buffered. Checking forrawBodybefore evaluatingisBodySourceFinishedallows these environments to read the body without being incorrectly rejected as an unusable/exhausted stream.Verification
test/node-adapters.test.tsverifying that pre-drained streams containingreq.rawBodycan be read viarequest.text()andrequest.json().pnpm vitest run test/node-adapters.test.tspasses (95 tests).oxlint,oxfmt, andtypecheckclean.Summary by CodeRabbit
Bug Fixes
Tests