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fix: stop Google sign-in hanging on /auth/callback in dev - #2538
mfortman11 wants to merge 9 commits into
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React StrictMode's dev remount unsubscribed the useMutation observer, which detaches it from the in-flight mutation. The remounted effect then hit the sessionStorage dedupe guard and returned, so the exchange succeeded on the backend but the page never saw the result: it stayed on "Signing you in..." with no redirect. Dedupe on the exchange promise (keyed by code) instead, so a re-run of the effect waits on the request already in flight, and keep status in component state. A reload of an already-used callback URL now shows an error instead of spinning with no request in flight.
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| Layer / File(s) | Summary |
|---|---|
Callback validation and setup frontend/app/auth/callback/page.tsx, frontend/app/auth/callback/page.test.tsx |
The page stores exchange promises by code, captures the redirect destination, and checks for previously processed codes. Tests set up callback URLs, count requests, and check the already-used-code response. |
Exchange lifecycle and outcomes frontend/app/auth/callback/page.tsx, frontend/app/auth/callback/page.test.tsx |
The page sends or reuses exchanges, invalidates connector queries when requests settle, and handles success, failure, and cleanup. Tests cover StrictMode, remounting, redirects, and exchange failures. |
Priority:
Estimated code review effort: 3 (Moderate) | ~20 minutes
Change: Bug fix
Sequence Diagram(s)
sequenceDiagram
participant AuthCallbackPage
participant ExchangePromiseMap
participant CallbackAPI
participant ReactQueryClient
AuthCallbackPage->>ExchangePromiseMap: Check exchange by authorization code
ExchangePromiseMap->>CallbackAPI: Send callback request when no exchange exists
CallbackAPI-->>ExchangePromiseMap: Return response or error
ExchangePromiseMap->>ReactQueryClient: Invalidate connector queries when request settles
ExchangePromiseMap-->>AuthCallbackPage: Resolve or reject shared exchange
AuthCallbackPage->>AuthCallbackPage: Update result and redirect or display error
Suggested reviewers: lucaseduoli
Merge Risk: 
c75cd
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The callback retains its redirect destination when the effect reruns. No actionable change-related risk remains after normal checks.
Pre-merge checks: 
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Check name Status Explanation Resolution Docstring Coverage Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within survi… Write docstrings for the functions missing them to satisfy the coverage threshold. -
Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: fixing Google sign-in hanging on the authentication callback page during development. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 2 functions across 2 files.
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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React Doctor found 1 new issue in 1 file · 1 warning · score 98 / 100 (Great) · 0 fixed · vs 1 warning
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Inline comments:
Review comments at @frontend/app/auth/callback/page.tsx:
- Around line 172-178: Preserve the resolved redirect target across effect
reruns in the OAuth callback flow. Add a ref near redirectTimeoutRef and reuse
its value before reading auth_redirect_to, the redirect search parameter, or the
/chat fallback; store the resolved target so a rerun after refreshAuth() and
cleanupOAuthStorage() redirects to the original route.
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frontend/app/auth/callback/page.test.tsxfrontend/app/auth/callback/page.tsx
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| // load. Keeping the promise (not just a "seen" flag) lets a re-run of the | ||
| // effect, such as StrictMode's dev remount, wait on the exchange already in | ||
| // flight instead of abandoning it. | ||
| const exchanges = new Map<string, Promise<CallbackResult>>(); |
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This promise doesnt have a clean up after a completion, risks rerunning same o-auth exchange in strict mode
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maybe a finally block for cleanup after 'exchanges' is done
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Keeping the entry after it settles is deliberate. It's what stops a re-run from POSTing the same code twice. A StrictMode re-run, a remount or a dependency change all find the stored promise and reuse its result.
If we deleted it in finally, a later effect run would find no entry and POST the spent code again. Google rejects that, so the page would flip from success to error. A remount would instead show "already used". I added a test (reuses a settled exchange when the page remounts with the same code) that fails with the delete and passes without it.
The cost is one settled promise per sign-in per page load. I added a short comment on exchanges saying this.
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| // Marked used by an earlier load of this URL (a reload or the back button) | ||
| // with no exchange in flight here. The code cannot be exchanged again. | ||
| const [codeAlreadyUsed] = useState( |
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NIT: condition here could be more explicit: this part isu sed for reloading/back button edge case right?
something like : "if exchanging, wait; else if code was previously processed, show used error" for more visibility? I think this is good as is logically
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Yes, this is the reload / back-button case: an earlier load already spent the code, and this page load has nothing in flight for it. Whether an exchange is in flight is the !exchanges.has(code) check, and in that case the effect waits on it. I left the logic as is and reworded the comment so it names the case.
| } | ||
| return result as CallbackResult; | ||
| }) | ||
| .finally(() => { |
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exchanges.delete(code) could be added here from earlier comment if im understanding this right
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Same as the line 40 thread: I'd rather keep the entry. Deleting it there is what would make the same OAuth exchange run again. It's covered by the new remount test.
Read auth_redirect_to once on mount: cleanupOAuthStorage() clears it, so a re-run of the effect after cleanup fell back to /chat. Add tests for the stored redirect target and for a remount reusing a settled exchange, and trim comments.
…/auth-callback-hang
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Inline comments:
Review comments at @frontend/app/auth/callback/page.tsx:
- Around line 145-169: Update the `/auth/callback` exchange promise in the
callback effect so its rejection path deletes the entry for `code` from
`exchanges` and removes `callbackKey` from session storage, then rethrows the
error to preserve rejection behavior. Ensure this cleanup runs even if the
effect has unmounted before the request rejects.
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frontend/app/auth/callback/page.test.tsxfrontend/app/auth/callback/page.tsx
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Clean up the exchanges entry and sessionStorage key in the request's own rejection path, so a failure that lands after the page unmounts isn't later reported as an already-used code.
…ag into fix/auth-callback-hang
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| const callbackKeyFor = (code: string) => `callback_processed_${code}`; | ||
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| function AuthCallbackContent() { |
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React Doctor · react-doctor/no-giant-component (warning)
Component "AuthCallbackContent" is 316 lines long, which is hard to read & change. Split it into a few smaller components.
Fix → Pull each section into its own component so the parent is easier to read, test, and change.
Problem
In
next dev, signing in with Google gets back to/auth/callbackand stays on "Signing you in..." indefinitely: no redirect and no error. The backend has already exchanged the code and set the session cookie, so navigating to/chatby hand works. That is why the bug looks intermittent.Root cause
The App Router enables React StrictMode in dev, so effects mount, unmount and remount. Since #2052 the page has run the code exchange through
useMutationwith per-call callbacks:callback_processed_${code}in sessionStorage and callsmutate().useSyncExternalStoresubscription drops.MutationObserver.onUnsubscribe()then removes the observer from the in-flight mutation, and nothing reattaches it on resubscribe.pendingandonSuccess(refreshAuth+ redirect) never runs.Production builds don't double-invoke effects, but reloading the callback URL left the page in the same state: the key is set, nothing is in flight, and idle renders as "processing".
Fix
code, so a re-run of the effect waits on the request already in flight. Status lives in component state. Anactiveflag makes sure only the latest effect run sets state or redirects.Tests
New
frontend/app/auth/callback/page.test.tsx:/chat, and sends exactly onePOST /auth/callback. This test fails onmain.main.The StrictMode test uses RTL's
reactStrictMode: true. A<StrictMode>nested inside therenderWithProviderswrapper does not double-invoke effects, so it doesn't reproduce the bug.Full frontend suite passes, and biome and tsc are clean.
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