fix(cloud oauth): retry a transient refresh failure inside the refresh lock

[mattmillerai]

ELI-5

When the CLI renews your cloud login, the server hands back a new refresh token and immediately retires the old one. Sometimes that reply gets lost: the request times out, the connection resets, or the server returns a 5xx. The CLI used to shrug and keep the old token. The next command then sent that already-retired token again, usually after the server's short grace window had closed. The server treats that as token theft, kills the whole login family, and you have to log in again. Now the CLI re-sends the same token a few times right away, while it still holds the refresh lock. The server's grace window answers that replay with a fresh token.

What changed

All in comfy_cli/cloud/oauth.py:

• _is_transient_refresh_error is new. A refresh failure counts as transient if it is status 0 (no HTTP response), 408 or >= 500. Anything _is_fatal_token_error catches (invalid_grant / invalid_token / reuse) is never transient, whatever its status. Other 4xx responses (invalid_client, invalid_request, ...) are also not retried. Neither is 429: the server asked us to back off and did not rotate the token. Local, deterministic refusals are also not retried: a plaintext non-loopback URL, or a TLS certificate-verification failure. _HTTPFail marks these retryable=False, and that flag is carried into OAuthRefreshError.details.
• _refresh_with_retry wraps refresh_tokens inside _locked_refresh. On a transient failure it re-POSTs the same refresh token up to 3 more times, sleeping 2s, 4s and 8s between attempts.
  • The whole retry phase is capped at 40s, measured from the first failure. Each retry POST's timeout is clamped to the budget that's left, so the cap holds even when every attempt times out.
  • A retry is not started with less than 5s left in the budget, and that is checked again after each sleep, so a sleep that overruns never starts a POST with a non-positive timeout.
  • The budget bounds connect and silent-read timeouts. urllib's timeout is per socket operation, so a server that trickles bytes can still stretch a single POST.
  • Terminal errors stop immediately and go through the existing clear-session path. Once retries run out, the existing "keep the stale session" branch runs, unchanged.
• _REFRESH_LOCK_TIMEOUT_S goes from 45s to 90s. That covers one holder's 30s POST plus the 40s retry phase. The TimeoutError fallback, which returns the pre-lock session, is unchanged.
• _send_and_parse now maps a bare OSError or an http.client.HTTPException (IncompleteRead, BadStatusLine) to a status-0 failure. urllib wraps connect-phase errors in URLError, but a read timeout or reset after the request was sent comes out of getresponse() as a bare TimeoutError. A body cut short raises IncompleteRead, which is not an OSError. Both are the "server rotated, response lost" case. If reading an HTTPError's body fails, the HTTP status is now kept with an empty body. Before this change it skipped OAuthRefreshError entirely and fell into the generic except Exception: return session branch, so the retry would never have seen it. As a side effect, the register and code-exchange paths now report a read timeout as their normal OAuth*Error instead of letting a raw TimeoutError escape.
• refresh_tokens / _post_form / _send_and_parse take an optional timeout. It defaults to the existing 30s _HTTP_TIMEOUT_S, so other callers behave the same.

Unchanged:

• The persist path: tmp+rename under the lock.
• _redact_token_response: no token values are logged or put in error messages.
• The reactive 401 path (_try_refresh_token → ensure_fresh_session(force=True)) inherits the retry without changes.

Judgment calls

• The 40s cap covers the retry phase, not the first POST. The spec reads "30s POST + up to 40s retries". With retry timeouts clamped to the budget, a run where every attempt times out gets one 30s-bounded retry. A run of fast 5xx failures gets all three.
• Longer lock holds block store reads too. The refresh lock is the same lock auth/store.py uses for every secret-store read. While a holder is in its retry phase, a peer's plain get_cloud_session() (which has no timeout) now waits up to about 70s in the worst case, instead of about 30s. Blocking peers until the token is settled is intended: it's what stops a peer from replaying the consumed token. But it is a longer worst-case stall.
• New commands wait in the store's own read. ensure_fresh_session's first get_cloud_session() takes the store lock with no timeout, so a new command waits out a holder's retry phase there rather than hitting the 90s fallback. Bounding the store's reads changes every secret-store read, so it is proposed as a separate follow-up.

Tests

Added in tests/comfy_cli/auth/test_oauth.py. They drive the real refresh_tokens with _post_form mocked and time.sleep patched:

• A status-0 failure then success on the 2nd attempt sends the same token twice, then rotates and persists RT1. Sleeps are [2.0].
• 503 four times: 4 POSTs, sleeps [2, 4, 8] (total under 40s), and the stale session is returned and still on disk.
• invalid_grant on the first attempt: one POST, no sleeps, the session is cleared and the call returns None.
• A 502 followed by invalid_grant stops and clears.
• A 401 invalid_client is not retried and keeps the session.
• Wall-clock budget with a fake clock where every POST burns its full timeout: the retry phase ends within 40s of the first failure.
• Classifier table for _is_transient_refresh_error (429 and retryable=False are not transient).
• A plaintext base URL and a TLS verification failure: no backoff, and the session is kept.
• A sleep that overruns the budget doesn't start another POST.
• Lock timeout: returns the pre-lock session, never calls refresh, and uses the 90s timeout. An invariant test checks _REFRESH_LOCK_TIMEOUT_S >= _HTTP_TIMEOUT_S + _REFRESH_RETRY_BUDGET_S.
• A bare TimeoutError and a truncated IncompleteRead from the opener map to _HTTPFail(0). An HTTPError whose body read fails keeps its status.

Two existing tests that feed a status-0 failure (test_transient_network_failure_keeps_session, and the credentials resolver's transient test) now patch time.sleep so they don't sleep for real. Two _post_form mocks accept the new timeout kwarg.

Residual

• The fix hasn't been tested against a live auth server. It relies on the server answering a replay inside the grace window with a new successor rather than revoking the family. The tests mock the token endpoint, so nothing here checks that behaviour against the real server. Nor have I measured whether reuse-detection family kills for the CLI client actually drop once this ships. That needs server-side telemetry after release.
• The grace-window margin depends on the server. It is currently 60s, with a separate server change planned to widen it to 5m. With the current 60s window, the in-lock retries all finish within about 70s of the first send, so a first POST that ran its full 30s timeout leaves the later retries close to the edge of a 60s window. The widened window removes that margin concern.
• Pre-existing test failure, unrelated to this change. tests/comfy_cli/command/test_logs.py::test_logs_pretty_warns_when_explicit_port_falls_back_to_unsuffixed fails on main too: I checked with this change stashed and it fails the same way. It is not auth-related.
• The full suite was not completed end to end. The -x run passed 2709 tests before it stopped at that failure. A second run with that test deselected was stopped for time before it finished, so the tests after that point in collection order weren't confirmed by a full run here. tests/comfy_cli/auth and tests/comfy_cli/test_credentials.py were run in full: 172 passed.

Provenance

• Authored by: agent-work loop
• Verified:
  • pytest over every test file that touches OAuth / refresh / credentials (15 files incl. tests/comfy_cli/auth, test_credentials.py, cloud/, command/test_run.py): 784 passed on cb4f327. The auth, credentials, run and cloud subset was re-run on 02cf51d: 525 passed.
  • ruff check . clean; ruff format --check .: 480 files already formatted.
  • The full pytest suite was not run to completion for this head. An earlier round's -x run passed 2709 tests, then stopped on a test_logs failure that also fails on main.
• Deviations:
  • _send_and_parse (the shared OAuth HTTP helper) now also maps a bare OSError / http.client.HTTPException to status 0. The spec assumed read timeouts already arrived as status 0. The change stays in oauth.py.
  • The 40s cap applies to the retry phase, and each retry's timeout is clamped to fit it.
  • 429 is not retried, although the spec listed it as transient. Retrying ignored the server's back-off and couldn't recover a rotated token.

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• comfy_cli/cloud/oauth.py
• tests/comfy_cli/auth/test_oauth.py

📝 Walkthrough

Walkthrough

OAuth refresh requests now support caller-supplied timeouts. Locked refreshes retry eligible transient failures with bounded delays and preserve or clear the existing session according to the error.

Changes

OAuth refresh handling

Layer / File(s)	Summary
Request timeout and transport errors comfy_cli/cloud/oauth.py, tests/comfy_cli/auth/test_oauth.py	Refresh timeouts pass through to the HTTP opener. OSError failures, including read timeouts, become status-0 HTTP failures. Mocks and tests cover keyword arguments and timeout error mapping.
Bounded retries and session handling comfy_cli/cloud/oauth.py, tests/comfy_cli/auth/test_oauth.py, tests/comfy_cli/test_credentials.py	Locked refreshes retry status 0, 408, 429, and 5xx failures with 2-, 4-, and 8-second delays, subject to a 40-second budget. The lock wait limit increases to 90 seconds. Fatal invalid_grant errors clear the session; exhausted retries and other non-fatal errors retain it. Tests cover retry limits, error classes, lock timeouts, and session outcomes.

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant LockedRefresh as _locked_refresh
  participant RefreshTokens as refresh_tokens
  participant PostForm as _post_form
  participant Opener as HTTP opener
  Caller->>LockedRefresh: Request session refresh
  LockedRefresh->>RefreshTokens: Start bounded refresh
  RefreshTokens->>PostForm: Send request with timeout
  PostForm->>Opener: Open OAuth request
  Opener-->>PostForm: Return response or transport error
  PostForm-->>RefreshTokens: Return token response or HTTP failure
  RefreshTokens-->>LockedRefresh: Return refreshed session or error
  LockedRefresh-->>Caller: Return refreshed or retained session

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Suggested reviewers: skishore23

Priority: ⬇️ Low

Merge Risk: 🔵 Low · up to 3e092

In a rare misconfiguration where a stored session uses a plaintext non-loopback URL, a refresh would wait about 14 seconds and block other credential reads during that time. This is bounded and easy to fix, so it is mergeable with the follow-up noted.

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Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
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Inline comments:
Review comments at @comfy_cli/cloud/oauth.py:
- Around line 662-665: Update _is_transient_refresh_error to exclude the
deterministic plaintext-URL refusal from retries, using a distinct marker
propagated from _assert_https_or_loopback through OAuthRefreshError details.
Keep existing transient status handling unchanged for other errors.

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🔍 Cursor Review — Consolidated panel

Triggered by @mattmillerai.

Found 10 finding(s).

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Panel: 6/6 reviewers contributed findings.

[skishore23]

LGTM. Retry is bounded and stops on fatal/TLS/429. The ~70s lock hold during a token-endpoint outage is an acceptable latency trade-off; fine to bound store-read waits in a follow-up.