fix(errors): drop 409 from the status->code fallback so a code-less 409 raises ComfyError - #132
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`_CODE_BY_STATUS` is consulted only when a response named no code of its
own -- no envelope `error.code`, no Router bucket. `ErrorEnvelope` makes
`error.code` required, so neither documented v2 `409` (`hash_mismatch` on
`POST /assets`, `asset_in_use` on `DELETE /assets/{id}`) ever reaches the
table; what does reach it are Router-shaped `{detail, error_type}` bodies
and intermediaries, which can answer a `409` for anything. Guessing
`HashMismatch` there told those callers to re-upload bytes over a conflict
that was never about bytes -- and the contract already spells the status
two ways, so even on the compliant surface the status alone cannot say
which.
A code-less `409` now decodes to `code = "error"` and stays a bare
`ApiError` carrying the real `http_status`, the response's own message and
any `Retry-After`, surfacing as a plain `ComfyError`. Enveloped and
bucket-carrying `409`s are untouched.
The table gains the admission rule this applies, so the next status added
is judged the same way: only a status with ONE meaning across every
documented surface gets a typed guess. `422` and `429` are kept
deliberately -- their misreadings stay inside the right action class
(terminal refusal / back-off-and-retry), unlike `HashMismatch`.
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Inline comments:
In `@tests/test_error_mapping.py`:
- Around line 117-129: Update
test_a_bucketless_409_is_not_guessed_to_be_a_hash_mismatch to pass a code-less
error body containing a message, then assert that the message is preserved in
both ApiError.message and the resulting ComfyError.message while retaining the
existing status and type assertions.
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CHANGELOG.mdsrc/comfy_low/errors.pytests/test_error_mapping.py
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🔍 Cursor Review — Consolidated panel
Triggered by @mattmillerai.
Found 4 finding(s).
| Severity | Count |
|---|---|
| 🟢 Low | 4 |
Panel: 6/6 reviewers contributed findings.
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…-status-fallback # Conflicts: # tests/test_error_mapping.py
- `error.code` is now `_clean`ed like every other code source. An empty or whitespace code is not None, so it short-circuited both the Router bucket and the status table and survived as the code itself -- a bare 401 yielded `ApiError(code="")` instead of `Unauthorized`. Pinned by a new test; mutation-checked by reverting the call. - Narrowed the admission rule from "ONE meaning across every documented surface" to "every meaning asks the caller for the SAME action". The old wording was not satisfied by the 422 the table deliberately keeps, which the spec spells four ways. The docstring now names `idempotency_key_reuse` as the known exception and why 422 is retained anyway: every documented 422 arrives enveloped and is decided by `error.code` before the table is reached, whereas 409 IS emitted code-less by Router and intermediaries. - Softened "a real hash mismatch always arrives enveloped" to "whenever the body decodes". `transport.py` sets `body=None` on an undecodable body, so a mismatch behind a broken intermediary does reach the dropped guess; that is the trade, not an oversight, and the docstring now says so. - Added the message-preservation test CodeRabbit asked for: a code-less 409 carrying a message keeps it on both `ApiError.message` and `ComfyError`. - Corrected the 409 tests to #141's `http_409` default; they asserted the pre-#141 `"error"` value and were stale after merging main. - Moved this PR's CHANGELOG entry back under [Unreleased]. The merge auto- placed it under the released `[0.1.9]` heading, which v0.1.9 never shipped. `asset_in_use` having no typed class is real but out of scope here (new public API surface); filed as BE-14168. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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…-status-fallback # Conflicts: # CHANGELOG.md
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2 participants
ELI-5
When the server sends back an error, it normally says what went wrong in a
machine-readable
error.code. If it doesn't, the SDK guesses the code from theHTTP status. For
409 Conflictthe guess washash_mismatch— "the bytes youuploaded don't match the hash you declared, upload them again."
That guess was only ever consulted for responses that came from somewhere other
than the surface where a real hash mismatch happens, and it told those callers to
re-upload bytes over a conflict that had nothing to do with bytes. This removes
the guess. A
409that names no code is now just aComfyErrorthat says409.Real hash mismatches are unaffected whenever their body decodes —
error.codenames them and wins outright. (The exception is a body that will not parse at all; see The one path this does not cover below.)Why the guess was never reachable for a real hash mismatch
_CODE_BY_STATUSis consulted only when the response named no code of its own(
src/comfy_low/errors.py): no envelopeerror.code, and no Router bucket fromX-Comfy-Error-Type/ a top-level bodyerror_type. Verified against thevendored specs:
ErrorEnvelopelistscodeandmessageunderrequired, so every v2envelope response carries a code and the table never decides one.
spec/openapi.yamldocuments exactly two409s, both answering inErrorEnvelope:hash_mismatchonPOST /api/v2/assetsandasset_in_useonDELETE /api/v2/assets/{id}. So the contract itself already spells the statustwo ways — the status alone cannot say which even on the compliant surface.
spec/router-openapi.yamldocuments one409(RouterIdempotencyConflicton
POST /v2/models/{provider}/{model}), whose body isRouterErrorResponse—
{detail, error_type}, witherror_typerequired and noerror.code. Thatpath is decided by the bucket, which already outranks the table, so it cannot
regress here.
What is left reaching the table on a
409is therefore Router-shaped bodieswhose bucket was stripped, and intermediaries — neither bound by what any route
documents for the status.
The one path this does not cover
transport.pysetsbody=Nonewhenever the error body fails to JSON-decode — anHTML proxy page, a truncated response. Such a
409names no code, so it reachesthe table, and after this change a genuine
POST /assetsmismatch behind a brokenintermediary raises
ComfyErrorrather thanHashMismatch.That is the trade this change makes rather than an oversight: on a body that will
not parse there is nothing that distinguishes the two documented
409s, andinventing the re-upload one is exactly the guess being removed. Scoping the drop
to the ambiguous route is not available —
error_from_responsesees status, bodyand headers, not the route. Raised by the Cursor panel; the docstring now states
this explicitly instead of claiming the assets path is unconditionally unaffected.
Change
409: "hash_mismatch"removed from_CODE_BY_STATUS. A code-less409nowgets
code = "error"and stays a bareApiErrorcarrying the realhttp_status, the response's own message (orHTTP 409), andretry_after;to_sdk_errorsurfaces it as a plainComfyError.added is judged the same way: only a status with ONE meaning across every
documented surface gets a typed guess.
422and429are kept deliberately— their possible misreadings stay inside the right action class (terminal
refusal / back-off-and-retry), unlike
HashMismatch, which tells the callerto re-upload bytes.
tests/test_error_mapping.py(module docstring widened from its 404scope) pin: a code-less
409is a plainApiErrorwithcode == "error"andhttp_status == 409andto_sdk_errorgives exactlyComfyError; a code-less409keepsretry_afteron both layers; an envelopedhash_mismatch409isstill
HashMismatchon both layers; a body-less401is stillUnauthorized.Riskiest line, and why it is safe
The deletion itself. Three things independently keep it from changing anything a
caller relies on:
hash_mismatchstill wins outright(
error.codeis read before the table).tests/test_assets.py'stest_hash_mismatch_surfaced_without_blind_retry— which drives the stubserver's real
409 hash_mismatchand asserts exactly one upload attempt —passes unchanged.
is_collectablegates a409onbucket == "concurrency_limit_exceeded". The old code-less bucket washash_mismatch; the new one iserror. Neither matches, so a code-less409stays a terminal refusal under
RetryPolicyexactly as before — no newsame-key resend, no new billed generation.
status; the existing
(409, "invalid_input")andconcurrency_limit_exceeded → ConcurrencyLimitExceededcases still pass._CODE_BY_STATUShas exactly one reader (error_from_envelope), so there are noother call sites to update.
Sweep of what is not changed
I re-read all 6 remaining entries in the table against the admission rule this
PR writes down. None fails it the way
409did: where a status is spelleddifferently by the two surfaces (
404not_foundvs Router'smodel_not_found;403forbiddenvsnot_enabled) the readings stay inside one action class —terminal, fix-the-request — and none of them directs the caller at a distinct
mutating action the way
HashMismatchdirects a re-upload. So no further entryis dropped here, and this is a deliberate finding rather than an unexamined
remainder.
Behaviour change for callers
A caller catching
HashMismatcharound a409that arrives without anerror.codenow seesComfyErrorinstead. That is the intended fix, and it isdocumented in the CHANGELOG. Every
409the contracts actually document — bothenveloped ones and the Router one — is unaffected.
Verification
Full required CI set locally on the worktree, plus the two non-
test-job gates:ruff check .— cleanruff format --check .— 51 files already formattedmypy src— no issues in 19 source filespytest— 722 passed, 4 skipped (the 4 are the env-gated live gateway suite)scripts/check_public_repo_hygiene.py— no internal-only referencesscripts/check_drift.py— models in sync, all 15 router error types coveredResidual
{detail, error_type}→ typedRouterErrorwork is out of scopehere and is only partly landed on
mainalready.error_from_envelopepreserves the bucket and
to_sdk_errorselects the typed subclass, soexcept NotEnabledand friends do fire — but that depends on the bucketactually reaching this function via the
X-Comfy-Error-Typeheader or atop-level body
error_type. A Router-shaped409that reaches the SDK withits bucket stripped (an intermediary that drops response headers and rewrites
the body) still decodes off the status table, which after this PR means a plain
ComfyErrorrather than theConcurrencyLimitExceededit really was. This PRdeliberately does not try to recover a bucket that is not on the wire; it only
stops the table from asserting a wrong specific cause. Anyone picking this up
should look at whether
{detail, error_type}bodies on the/models/runpathneed a stronger identification path than the bucket alone.
documented surfaces in the two vendored specs, not a measurement of live
traffic. If an intermediary is in practice minting bucket-less
403s or404sthe way the record shows it mints
409s, the same argument would apply tothose entries and it would be visible in production error telemetry, which I
cannot query from here.
findings write-up, are in an internal tracker I have no access to — I could not
read them and reconstructed the reasoning from the vendored specs and the code
instead (which is what the empirical section above is). The prior change that
added
request_idand madeto_sdk_errorforwardretry_afterwas open whenthis work was specified; I confirmed it is merged by reading
main(
src/comfy_sdk/exceptions.py), not by reading that PR, and added theto_sdk_errorretry_after assertion accordingly. No live server was called —the suite is stdlib-stub-driven by design.
Provenance
Summary by CodeRabbit
409) responses without an explicit error code: they now remain generic errors instead of being classified as hash mismatches.422,429, andRetry-Afterresponses.401) responses continue to be identified correctly.