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fix(qdrant): probe the undici pair instead of matching a Node version - #195
giancarloerra merged 2 commits into
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@qdrant/js-client-rest is pinned to ~1.18.0, which bundles undici 6, and the
transport bridge that pairs that dispatcher with a matching fetch was gated on
`nodeMajor < 26`. That gate is too narrow: the breakage follows the *undici
pair*, not a Node major, and it reaches Node 24 as well.
The clearest evidence is that two builds reporting the same
`process.versions.node` disagree. Against a live Qdrant 1.19.1 with client
1.18.0 and no bridge:
official Node 24.21.0 (undici 7.29.1) -> OK
official Node 24.13.0 (undici 7.16.0) -> OK
distribution Node 24.21.0+dfsg+~cs24.13.4 -> FAIL
InvalidArgumentError: invalid onError method
The distribution rebuild repackages an older source snapshot and its built-in
fetch hands an undici 6 dispatcher a handler without `onError`, so undici 6's
own recovery path throws and the caller only sees `TypeError: fetch failed` —
which `codebase_health` reported as "External Qdrant: Unreachable" against a
perfectly healthy server. Since `engines.node` is `>=18.17.0`, no version table
can be both complete and correct.
So select the transport by probing the capability: hand the built-in fetch a
stub dispatcher and check whether the handler it passes exposes `onError`. No
network round trip, and correct on any Node/undici combination. Verified to
return the right verdict on both builds above (bridge needed on the
distribution one, not needed on the official one). The version table is kept as
the fallback and `unknown` still fails closed.
Co-Authored-By: Giancarlo Erra <giancarlo@altaire.com>
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Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe Qdrant compatibility module now probes whether built-in fetch supports the undici dispatcher. If the probe fails, the module selects paired undici. If the probe succeeds, the existing version-based selection applies. Unit tests cover probe outcomes and transport selection. ChangesQdrant fetch compatibility
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Suggested reviewers: Merge Risk: ⚪ Minimal · up to The capability probe adds transport fallback coverage, with no established merge-blocking issue. Complete normal checks before merging; test execution and runtime behavior were not independently verified. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The transport change remains restricted to configured Qdrant origins and requests carrying a dispatcher. No introduced security vulnerability was established, but credential handling across redirects could not be compared between the two transports. Retained concerns Security review detailsSecurity Blast Radius
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/services/qdrant-client-compat.ts:
- Line 113: Update the compatibility probe’s dispatcher handler to record the
error with onError, then throw a sentinel error so the pending fetch rejects and
the existing catch can consume it; do not return true from this path.
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src/services/qdrant-client-compat.tstests/unit/qdrant-client-compat.test.ts
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Please make one correction pass before re-review:
Please batch both changes. The next review will run after the new head is stable and CI is terminal. |
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One datum from the package side, if it helps the fallback table. Re-ran the boundary against official linux-x64 tarballs, each dispatcher major against each runtime, request to a local HTTP server (2026-09-24 / 09-25):
Same table, read from the library side rather than the build side. Direction matters and the cause names it: whichever side sits on undici 8 decides which method it complains about. It also reaches packaged SDKs. One trap the probe may want to keep in view: on Node 26, a u5/u6 dispatcher handed to the global dispatcher slot is silently ignored rather than rejected - no throw, no pairing, the request just falls through to the native path. A handler-shape probe catches the loud path; the silent one needs a version check or a request-level assertion. Longer writeup, plus the same fault seen in n8n, Vercel CLI and Ring: https://github.com/vex-7-agent/vex-7-agent/blob/main/field-notes/undici-dispatcher-major-mismatch.md |
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Taking over this PR to finish the remaining fixes and validation, targeting inclusion in the next release. Thanks for the contribution. |
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✅ Action performedReview finished.
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Completed the remaining probe cleanup and initialization regression coverage in 85b96a1. All ten CI jobs passed, and the completed CodeRabbit review reported no actionable comments against this head. Targeting inclusion in the next release. |
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Summary
codebase_healthreportedExternal Qdrant: Unreachableagainst a Qdrant server that was up and healthy, and every Qdrant request failed withTypeError: fetch failed.@qdrant/js-client-restis pinned to~1.18.0, which bundles undici 6, and the transport bridge that pairs that dispatcher with a compatiblefetchis gated onnodeMajor < 26. That gate is too narrow: the failure follows the undici pair, not a Node major, and it reaches Node 24 too.This PR selects the transport by probing the actual capability rather than matching a Node version table.
What I got wrong initially
I first reported this as "Node 24 is broken by the same Node 26 issue." That is incorrect. A report that the same client works on Node 24 without the bridge prompted a re-test, and the version is the least interesting part of the story — two builds reporting the same
process.versions.nodebehave differently:Against a live Qdrant 1.19.1, client 1.18.0, no bridge:
24.13.024.21.024.21.0+dfsg+~cs24.13.4apt-cache policy nodejsshows24.21.0+dfsg+~cs24.13.4-1— a repack built from the 24.13.4 source snapshot — and itsprocess.versions.undiciisundefinedwhere the official build reports7.29.1. Note that official 24.13.0 works, so this is not merely "an older undici".Mechanism
Node's built-in
fetchpasses aFetchAPIHandlerconstructed from its own bundled undici, so the handler's method set tracks that undici's API. The official 24.21.0 handler exposesbody, abort, onConnect, onResponseStarted, onHeaders, onData, onComplete, onError, …; the distribution build's exposes a different set withonRequestStart, onResponseStarted, onResponseStart, onResponseData, onResponseEnd, onResponseError, …— noonError.undici 6's
DispatcherBase.dispatchcatches a throw and callshandler.onError(err). With noonErrorpresent, undici 6 throwsInvalidArgumentError: invalid onError methodfrom its own recovery path, and the caller only ever seesTypeError: fetch failed. undici 7 changed this branch tothrow err, which is why a 1.19 client (bundling undici 7) works on the same build with no bridge.I would not characterise this as a Node or Debian bug: the bundled-undici version and its handler shape are not a public contract, and this is only observable through an undici dispatcher. It is a version-table being wrong, which is exactly what a capability probe avoids.
Changes
nativeFetchSupportsUndiciDispatcher(): hands the built-in fetch a stub dispatcher and checks whether the handler it passes exposesonError. No network round trip, and correct for any Node/undici pairing, patched or official.ensureQdrantClientCompatibility()consults the probe first and treats it as authoritative; the(nodeMajor, clientVersion)table is kept as the fallback, andunknownstill fails closed.The probe was verified to return the correct verdict on both builds —
bridge neededon the distribution one,bridge NOT neededon the official one.Type of change
Testing
npm run test:unit)npx tsc --noEmit)npm run test:integration) — not run (requires Docker)Four new unit tests cover the probe: handler without
onError(unsupported), handler withonError(supported), synchronous throw (unsupported), and a fetch that never reaches the dispatcher (unsupported).End-to-end against a live Qdrant on the distribution build:
npx tsc --noEmitexits 0 andbiome checkis clean on both changed files.Pre-existing failures (unrelated)
The full unit suite reports 11 failed files / 95 failed tests on unmodified
mainas well — verified by stashing this branch and re-running:main)All 83 errors are
EACCES: permission deniedon a root-owned/tmp/socraticode-locksin this environment, in lock/graph/context-artifact suites. None touch this change.Checklist
Related issues
Summary by CodeRabbit