feat(models): queue a model request with submit, subscribe and handle by mattmillerai · Pull Request #137 · Comfy-Org/comfy-python-sdk

mattmillerai · 2026-09-09T22:28:32Z

ELI-5

client.models.run(...) sits on the phone until your picture is ready. That's fine for a script and useless for a web server. This adds the other way to do the same thing: client.models.submit(...) hands the request to the queue and gives you back a ticket stub, and you go and get the picture later — from a different process if you like, because the stub is just two ids. subscribe(...) is the same thing with the waiting done for you and a callback for the progress bar. The queue itself is entirely the server's — this only knows how to ask "is it done yet?" politely, at the pace the server asks for.

What this adds

handle = client.models.submit("fal-ai/flux-pro", {"prompt": "a cat"})
handle.request_id            # 'req_...' — all another process needs
result = handle.get()        # poll to completion, return the provider's payload

# ...or in one call, with progress
result = client.models.subscribe(model, args, on_queue_update=print, timeout=300)

# ...or from somewhere that never made the submit
result = client.models.handle(model, request_id).get()


`models.submit(model, arguments)`	queue it; returns a `RequestHandle`
`models.subscribe(model, arguments, on_queue_update=…, timeout=…)`	submit + poll + collect
`models.handle(model, request_id)`	rehydrate a handle from the two ids, no request made
`RequestHandle.status()` / `.get()` / `.cancel()` / `.iter_events()`	the handle

Plus QueueUpdate (the poll observation) and router_exceptions.error_from_completion().

The shape is deliberately the one comfy_sdk.jobs already uses for workflow jobs — submit, hold a handle, poll to terminal with adaptive backoff, collect or cancel — rather than a second idiom for the same thing. No queue behaviour is implemented client-side: ordering, admission, retries, timeouts, billing and expiry are all the server's, and this adds polling and ergonomics on top and nothing else.

Three properties that are contract rather than implementation detail:

Poll-authoritative, server-paced. There is no stream on this surface, so iter_events is the poll loop with its updates exposed, not SSE. It backs off adaptively and a Retry-After the server names on a poll beats that schedule; a Retry-After: 0 names no pace and falls back to the schedule rather than becoming a zero-delay loop.
A 200 is not a success here. The server reports a failed and a cancelled request as COMPLETED carrying an error_type, so every path that hands back a result runs the payload through the typed RouterError mapping first. An error_type this version has never heard of still raises the catchable base class.
One Idempotency-Key per submit call. Two deliberate submits are two requests; a transport-level retry inside one call keeps the one key and replays the original. Every exception carries it on .idempotency_key, which is the only route back to a request whose response was lost.

AsyncComfy awaits the same names with the same arguments in the same order. The existing introspection parity test discovers the new RequestHandle/AsyncRequestHandle pair and the three new models methods automatically; I extended its one explicit assertion to name them so the coverage cannot go vacuous.

client.models.run is unchanged. The only edits to models.py outside the new methods are two import lines (git diff on that file shows exactly two removed lines, both imports).

The one thing to look at first

The four routes are hand-bound and provisional:

_MODEL_REQUESTS_PATH_TEMPLATE        = _MODEL_RUN_PATH_TEMPLATE + "/requests"
_MODEL_REQUEST_PATH_TEMPLATE         = _MODEL_REQUESTS_PATH_TEMPLATE + "/{request_id}"
_MODEL_REQUEST_STATUS_PATH_TEMPLATE  = _MODEL_REQUEST_PATH_TEMPLATE + "/status"
_MODEL_REQUEST_CANCEL_PATH_TEMPLATE  = _MODEL_REQUEST_PATH_TEMPLATE + "/cancel"

The upstream contract that declares these four operations is authored but held, and the one-way sync into spec/router-openapi.yaml strips a held operation — so unlike _MODEL_RUN_PATH_TEMPLATE, which tests/test_router_spec_contract.py pins against the vendored file byte for byte, these have nothing to pin them to. They are gathered in one place and nowhere else precisely so the sync that publishes them is a four-line diff plus the assertion that pins them, exactly as the run path was hand-bound before its own spec arrived. test_the_queue_routes_extend_the_run_route pins what can be pinned today (the relationship to the run path and the segments each template fills) and says in its docstring what to replace it with.

Wire shapes assumed, all derived from what the surface itself forces rather than invented freely: the submit response names request_id; the status body carries status / queue_position / error_type; COMPLETED is the one terminal status. That both submit and handle need the model id and the request id is what says the request routes hang under the model-addressed prefix. Every one of these is parsed defensively — a missing field degrades rather than raising a decode error, an unknown status is treated as not yet terminal, and an unknown error_type still raises a catchable RouterError.

Judgment calls

No submit_async / subscribe_async aliases. The plan lists them as aliases; this repo's tests/test_sync_async_parity.py bans the _async suffix anywhere on the public surface (_SUFFIXED), models.py states there is deliberately no run_async "and there never will be", and the acceptance criterion itself asks for identical method names on AsyncComfy. Adding the aliases would mean weakening an existing guard to publish a second name for one operation, which cannot be withdrawn once released. I implemented the identical-names half and left the aliases out.
AsyncModels.handle is async def even though it makes no request. The alternative was declaring it a deliberate asymmetry in the parity test's _SYNC_ON_BOTH table. Awaiting it keeps the "add await" contract exception-free, needs no edit to that table, and leaves room to validate server-side later without a breaking change.
No client-side feature flag. The gate is the server's: an unflagged caller is answered 403 not_enabled, which arrives as the typed NotEnabled (tested). A second, client-side switch would be a local re-statement of a decision made somewhere authoritative — the same reason no queue behaviour is reimplemented here. The release-lifecycle half is the pre-release, below.
On the result route, an error_type only counts inside the queue envelope. That body is the provider's own payload forwarded verbatim, and a partner model is free to have a field called error_type in its native schema; raising on one would fail a generation that succeeded. So the result body is only read as a failure when it carries a COMPLETED status alongside it. The status read has no such ambiguity and is checked unconditionally, so the authoritative report of a failure is never the one that gets missed. Both directions are tested.
subscribe's TimeoutError catch is scoped to the iteration alone, not to the callback. A progress callback that makes its own HTTP call can raise TimeoutError for reasons that have nothing to do with this wait, and cancelling a healthy queued request on the strength of it would throw a charge away. Tested.

Verification of the pre-release path

The release-candidate publish is a human step, but the tooling half is checkable and worth knowing before the tag is cut: publish.yml validates the release tag as SemVer, where a pre-release is a --separated segment. Measured against that check —

tag	result
`v0.2.0-rc1`	accepted
`v0.2.0-rc.1`	accepted
`v0.2.0rc1`	rejected (this is PEP 440's own spelling)

and building with the accepted form produces comfy_sdk-0.2.0rc1-py3-none-any.whl, twine check PASSED — the version normalises to PEP 440 on the way through, so pip install comfy-sdk will not pick it up without --pre, which is the point of shipping one. The README's Releases section now says all of this.

Provenance

Authored by: agent-work loop
Verified: uv run --extra dev pytest -q: 774 passed, 4 skipped, 0 failed (53 of them new, in tests/test_models_queue.py); ruff check . clean; ruff format --check .: 53 files already formatted; mypy src: no issues in 20 files; scripts/check_public_repo_hygiene.py: no internal-only references; scripts/check_drift.py: models in sync, all 15 router error types covered, run path matches the vendored spec; a local python -m build of the tree at version 0.2.0-rc1 → comfy_sdk-0.2.0rc1-py3-none-any.whl, twine check PASSED.
Deviations: the submit_async / subscribe_async aliases in the plan are deliberately not implemented (reason above); the release-candidate publish is not done here (it is a human step — see Residual).

Residual

Not fixed by this PR, and actionable on its own:

The four route templates are unverified against a real deployment, and against the contract that declares them. The upstream OpenAPI operations are authored but held, so they are absent from spec/router-openapi.yaml and there was nothing to compare against; the queued surface is also gated server-side, so there was no deployment I could exercise it against from here. Everything in this PR is proven against the recorded stub in tests/conftest.py, which is a stub I wrote to my own assumption of the shape — it cannot falsify that assumption. When the operations land in the vendored spec, reconcile the _MODEL_REQUEST* constants in src/comfy_low/transport.py against it and extend tests/test_router_spec_contract.py to pin them the way it pins the run path (test_run_path_matches_vendored_spec currently asserts the spec declares exactly one POST path, so it will need to admit the new ones). If the real routes differ, the four constants and the stub's four regexes are the whole change; the handle and the namespace methods above them are route-agnostic.
The response field names are assumed, not read from a contract. request_id, status, queue_position, error_type, detail, and COMPLETED as the one terminal status. Each is parsed defensively so a mismatch degrades rather than crashes — but a wrong field name degrades silently into "the queue never completes" (an unknown status is treated as not-yet-terminal) rather than into an error. Worth an explicit check against the contract in the same pass as item 1.
The internal design appendix carrying the exact signatures and examples was not readable from here, nor was the parent epic. The surface implemented here is the one the ticket text itself enumerates; if the appendix pins a different parameter name or ordering, that is a published-signature change and is cheaper to catch before the pre-release than after.
A server-issued request_id containing / is refused (ComfyError, at submit, rather than at the first poll). Under the route shape above a request id is a single path segment, so this cannot arise — but it is a guard written against my own assumption, and it belongs in the item-1 reconciliation. It follows the discipline the shipped parse_model_id already applies to the model id's segments.
The release-candidate publish itself is not done, and is not this PR's to do — the ticket names it as human follow-through. What is done: the tag spelling the publish workflow will and will not accept is measured above, and an RC wheel was built and twine checked locally. To ship it: merge this, then create a GitHub Release tagged v0.2.0-rc1 (not v0.2.0rc1). A plain release rather than a pre-release would not satisfy the ticket even though the code would be identical.
Diff size. ~2,000 lines, above the 400-line guideline for one unattended PR. It is one coherent feature in one module family — roughly 60% of it is docstrings and tests, matching this repo's house style — and splitting it would have produced PRs that could not be reviewed against each other. Flagging it rather than pretending it is small.

Summary by CodeRabbit

New Features
- Added synchronous and asynchronous queued model requests with submission, subscription, and request-handle workflows.
- Added queue status updates, progress-event iteration, result retrieval, cancellation, and timeout handling.
- Added server-paced polling, idempotency-key support, request-handle rehydration, and typed errors for failed completed requests.
- Added feature gating for environments where queued requests are unavailable.
Documentation
- Documented queued request workflows, asynchronous usage, polling, cancellation, errors, idempotency, and release versioning guidance.

`models.run` holds one connection open until the generation is finished. This adds the queued form of the same request for a caller who cannot wait that long: `client.models.submit(model, arguments)` returns a `RequestHandle` as soon as the server accepts the request, and the generation is collected later — including from another process, since `client.models.handle(model, request_id)` rebuilds the handle from nothing but the two ids that address it. The handle carries `status()`, `get()`, `cancel()` and `iter_events()`, and `models.subscribe()` is submit plus polling plus collection in one call, with an `on_queue_update=` callback for progress and a client-side `timeout=` that makes a best-effort cancel before it raises. The shape is the one `comfy_sdk.jobs` already uses for workflow jobs rather than a second idiom, and the queue itself stays server-owned: ordering, admission, retries, timeouts, billing and expiry are not reimplemented here. Three properties are contract rather than implementation detail: - Polling is authoritative and paced by the server's own `Retry-After` when it names one, by an adaptive backoff when it does not. There is no stream on this surface, so `iter_events` is the poll loop with its updates exposed. - A `COMPLETED` status carrying an `error_type` — how the server reports a failed *and* a cancelled request — raises the typed `RouterError` subclass. A 200 with an error payload is never handed back as a result. - Each `submit` *call* mints one fresh `Idempotency-Key`, so two deliberate submits are two requests while a transport retry inside one call replays the original rather than queueing a second generation. `AsyncComfy` awaits the same method names with the same arguments in the same order; the existing introspection parity test discovers the new pair and compares it. There is no `submit_async`, for the same reason there is no `run_async`. The four routes are hand-bound and confined to the `_MODEL_REQUEST*` constants in `comfy_low.transport`: the contract declaring them is authored but held, so the vendored Router spec does not carry them yet and there is nothing for the contract test to pin them against. That is the one part of this change a spec sync is expected to correct. `client.models.run` is unchanged in behaviour and signature.

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📝 Walkthrough

Walkthrough

The SDK adds synchronous and asynchronous queued model requests. It supports submission, handle rehydration, status polling, event iteration, result retrieval, cancellation, idempotency keys, timeout handling, typed completion errors, and Router feature gating.

Changes

Queued model requests

Layer / File(s)	Summary
Router queued-request transport `src/comfy_low/transport.py`	Adds validated route construction and synchronous/asynchronous methods for queued submission, status, result, and cancellation.
Request handles and completion errors `src/comfy_sdk/model_requests.py`, `src/comfy_sdk/router_exceptions.py`	Adds queue updates, polling, adaptive pacing, timeout handling, cancellation, result collection, and typed completion-error translation.
Synchronous and asynchronous model APIs `src/comfy_sdk/models.py`, `src/comfy_sdk/__init__.py`, `src/comfy_sdk/client.py`, `src/comfy_sdk/exceptions.py`	Adds `submit`, `subscribe`, and `handle` to both model namespaces, with idempotency, callbacks, timeout cancellation, and public exports.
Queue behavior validation and documentation `tests/conftest.py`, `tests/test_models_queue.py`, `tests/test_sync_async_parity.py`, `README.md`, `CHANGELOG.md`	Adds queued-route stubs and coverage for polling, retries, errors, cancellation, async parity, and documented API usage.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant Models
  participant Router
  participant RequestHandle
  Client->>Models: submit(model, arguments)
  Models->>Router: POST queued model request
  Router-->>Models: request ID
  Models-->>Client: RequestHandle
  Client->>RequestHandle: get() or iter_events()
  RequestHandle->>Router: GET status
  Router-->>RequestHandle: QueueUpdate and Retry-After
  RequestHandle->>Router: GET result after COMPLETED
  Router-->>Client: result or typed completion error

Suggested reviewers: wei-hai, sundar-svg

Merge Risk: 🔵 Low · up to d83b3

Valid non-object queued results work at runtime but are inaccurately typed for SDK consumers. This is a bounded developer-facing issue and can be merged with owner awareness.

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Inline comments:
In `@README.md`:
- Line 460: Update the README rehydration requirement near the handle.request_id
documentation to state that another process must retain both model and
request_id; clarify that request_id alone is insufficient for
client.models.handle(model, request_id) and queued-route addressing.

In `@src/comfy_sdk/model_requests.py`:
- Line 218: Update the completion check around _raise_for_completion to handle
non-Mapping provider results before calling payload.get, returning arrays or
scalars unchanged when envelope_only is enabled. Widen the result-path
annotations used by RequestHandle._collect and AsyncRequestHandle._collect from
dict[str, Any] to the supported JSON result type, keeping object payload
completion handling unchanged.

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robinjhuang

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- bound a caller's timeout over the poll itself, its retries and the result fetch, not only the pause between polls (get/subscribe/iter_events) - start subscribe's clock before the submit, and issue its cleanup cancel under NO_RETRY with a short HTTP bound so a timeout is not followed by a minute of retrying the cancel - best-effort remote cancel when an async subscribe task is cancelled from outside, shielded and bounded - cap a server-named Retry-After at 60s before sleeping on it, so a huge value neither parks the caller nor overflows float() - guard non-object bodies: a status or submit body that is not a JSON object is an invalid_response, a result that is not one is handed back unchanged - require the authoritative status read to name a status, so a 200 {} cannot be polled forever - read a blank error_type as no error on an update, the same way the raising path already does - carry the addressed request id on an update rather than the body's copy, and bound a request id to 256 printable characters before it reaches a path or a message - send the cancel as PUT, which is the verb the contract declares - README: rehydration needs the model id and the request id, and the id is a UUID

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README.md (1)
482-483: 📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

Document the 60-second ceiling on a server-named poll pace.

The text states that a Retry-After on a poll beats the local schedule. _pace now caps that value at _MAX_PACE (60 seconds), so a server naming a longer pace is polled sooner than the header asks. Add the bound here, otherwise a reader sizing their own poll expectations from this paragraph gets the wrong number.
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In `@README.md` around lines 482 - 483, Update the README paragraph describing
server-provided Retry-After pacing to state that the effective poll delay is
capped at 60 seconds by _pace and _MAX_PACE, so longer server-specified values
are bounded accordingly.

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Inline comments:
In `@src/comfy_sdk/model_requests.py`:
- Line 517: Update _collect, get, and their asynchronous counterparts to
annotate results with the supported JSON value type rather than dict[str, Any].
Reuse or export a JsonValue-style alias with the public types, and ensure
parse_or_raise results preserve arrays and scalar values as well as objects.

In `@tests/conftest.py`:
- Around line 588-599: Update do_PUT to call _auth_ok() before routing or
reading the request body, matching do_GET, do_POST, and do_DELETE. Preserve the
existing cancel route behavior while ensuring authentication metadata is
recorded and unauthorized requests return 401 when require_auth is enabled.

In `@tests/test_models_queue.py`:
- Line 817: Update the test’s sleep patch near _pause so it does not replace the
shared asyncio.sleep used by other code; patch a module-owned sleep alias or
make _pause delegate to the real delay for non-poll calls, while preserving the
accelerated polling behavior under test.

---

Outside diff comments:
In `@README.md`:
- Around line 482-483: Update the README paragraph describing server-provided
Retry-After pacing to state that the effective poll delay is capped at 60
seconds by _pace and _MAX_PACE, so longer server-specified values are bounded
accordingly.

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- conftest: do_PUT runs the same _auth_ok check as the other verbs, so the cancel route records its Authorization header and honours require_auth - test_models_queue: the asyncio.sleep patch is a pass-through that only reports the pause; every caller still waits the delay it asked for - RequestHandle.get: the docstring says the dict[str, Any] annotation is the contract (shared with models.run) and that an off-contract non-object payload is passed through as robustness, not as a second return type

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Resolves three conflicts, all the same shape: main rewrote the idempotency_key documentation while this branch added models.submit to the set of surfaces that record a key. Each is resolved by taking main's fuller text and weaving models.submit into it, not by picking a side — `--ours` would have silently dropped main's ApiError.body_excerpt and POST /jobs key-rejection prose, and `--theirs` would have dropped the queue surface. - src/comfy_sdk/exceptions.py — main's text for the idempotency_key attribute doc, with Models.submit named alongside Models.run in both the "who records it" list and the "what it is good for" paragraph. models.run and models.submit hit a surface that REPLAYS a claimed key; POST /jobs REJECTS a reused one with 422 idempotency_key_reuse. That distinction is main's and it is worth keeping. - README.md — same weave in the prose version. - CHANGELOG.md — pure both-sides-add: the queue entries followed by main's Asset.get_download_url() and ApiError.body_excerpt entries, with main's trailing "### Changed" and [0.1.9] sections preserved. Verified: 833 passed / 4 skipped; exceptions.py compiles; and the merged tree completes a real queued call against stg-v2, where the Router queue went live today (cloud#9227) — submit -> IN_PROGRESS -> COMPLETED with the expected content and token usage. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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mattmillerai added the agent-coded Authored by the agent-work loop label Sep 9, 2026

mattmillerai marked this pull request as ready for review September 9, 2026 22:28

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mattmillerai added the full-autonomy Approved AI-brownfield: merges on machine gates alone, no human approver. Design doc + flag req'd. label Sep 9, 2026

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mattmillerai dismissed stale reviews from coderabbitai[bot] and robinjhuang via a7a8e11 September 10, 2026 18:11

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Comment thread tests/conftest.py

Comment thread tests/test_models_queue.py

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mattmillerai dismissed stale reviews from coderabbitai[bot] and robinjhuang via 0f5426d September 10, 2026 18:39

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mattmillerai added do-not-merge Waiting on a dependency outside this repo (e.g. a cloud deployment); broken if merged now and removed full-autonomy Approved AI-brownfield: merges on machine gates alone, no human approver. Design doc + flag req'd. labels Sep 10, 2026

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docs(changelog): cut 0.2.0 #144

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mattmillerai dismissed robinjhuang’s stale review via d83b342 September 14, 2026 20:34

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mattmillerai removed the do-not-merge Waiting on a dependency outside this repo (e.g. a cloud deployment); broken if merged now label Sep 14, 2026

mattmillerai added the full-autonomy Approved AI-brownfield: merges on machine gates alone, no human approver. Design doc + flag req'd. label Sep 14, 2026

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mattmillerai merged commit f58f1c7 into main Sep 14, 2026
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mattmillerai deleted the matt/be-12725-models-queue-handle branch September 14, 2026 21:46

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ELI-5

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🔍 Cursor Review — Consolidated panel

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mattmillerai commented Sep 9, 2026 •

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