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Report an MCP OAuth callback failure before a retry - #2238
This change makes waitForAuthCode() report a callback listener failure that occurs before a caller waits. It follows the review discussion in #2129.
Before this change, the rejection handler cleared the listener. The next waitForAuthCode() call then started a new listener and waited for up to five minutes. The original error was not reported.
Keep a failure that occurs while no caller waits.
Report that failure once on the next waitForAuthCode() call. That call does not start a new listener.
Start a new listener on the call after that.
Give the original error to a caller that already waits, as before.
Close each failed listener. Ignore cleanup errors, so that they do not replace the callback error.
Start a new listener only after the old listener closes. The new listener can use the same port.
Discard a kept failure when a new listener starts or when close() runs. An old failure cannot affect a new attempt.
Detach the listener in close() before the cancel. The provider then does not keep the cancellation as a failure.
Keep the .catch handler that prevents unhandled promise rejections.
Reviewers should check the state changes in waitForAuthCode(), in the rejection handler in _doStartCallbackServer(), and in close().
The test setup now resets the callback server mocks before each test. One existing test used a mock from an earlier test. That test now sets up its own mock.
Test Procedure
Run cd src && npx vitest run services/mcp.
Run pnpm --dir src run check-types.
Run ESLint and Prettier on the changed files.
Run pnpm mcp:integration-check.
New tests cover these cases:
A listener fails before the first caller waits, and while a caller waits.
A listener receives a code before the first caller waits, and while a caller waits.
Two callers wait for a listener that fails immediately.
A replacement listener fails before a caller waits.
redirectToAuthorization() or close() discards a kept failure.
A new listener starts only after the failed listener closes.
close() waits until a failed listener closes.
After close(), a new attempt gets a new listener. This is true when cleanup succeeds and when it fails.
McpHub shows the callback error and disconnects the server when waitForAuthCode() rejects.
Results:
215 MCP tests passed.
6 new provider tests fail on main. They pass with this change.
I removed each new guard one at a time (9 checks). At least one test failed each time.
5 runs in random test order passed.
TypeScript, ESLint, and Prettier passed. ESLint suppression counts did not change.
The 16-case MCP OAuth integration check passed.
Pre-Submission Checklist
Issue Linked: This PR is linked to an approved GitHub Issue.
Scope: My changes are focused on the linked issue.
Self-Review: I reviewed my own code with care.
Writing Style: The PR title and description use Simplified Technical English.
Testing: New and updated tests cover these changes.
Visual Snapshot: Not applicable. This PR has no UI changes.
Documentation Impact: I checked the documentation impact.
Contribution Guidelines: I read and agree to the Contributor Guidelines.
Visual Snapshots
Not applicable. This PR has no UI changes.
Videos (interaction / animation only)
Not applicable. This PR has no UI interaction changes.
Documentation Updates
No documentation updates are required.
Additional Notes
The source branch contains one commit. It is based on the current upstream main branch.
In Node, server.close() does not reject when the listener is already closed. The cleanup error handling is a safeguard. A test covers it with a mocked rejection.
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GitHub Actions: Visual Regression / 1_webview-visual.txt: Report an MCP OAuth callback failure before a retry
##[group]Run pnpm --filter @roo-code/vscode-webview test:visual
�[36;1mpnpm --filter @roo-code/vscode-webview test:visual�[0m
shell: sh -e {0}
env:
PNPM_HOME: /github/home/setup-pnpm/node_modules/.bin
STORE_PATH: /__w/.pnpm-store/v10
##[endgroup]
> @roo-code/vscode-webview@ test:visual /__w/Zoo-Code/Zoo-Code/webview-ui
> playwright test -c playwright-ct.config.ts
Running 78 tests using 2 workers
✓ 2 [chromium] › src/components/chat/__tests__/ChatTextArea.visual.tsx:7:2 › renders the production chat composer in the VS Code dark theme (7.0s)
✓ 1 [chromium] › src/components/chat/__tests__/Announcement.links.visual.tsx:4:1 › announcement links open exactly once through the extension host (9.7s)
✓ 3 [chromium] › src/components/chat/__tests__/ChatTextArea.visual.tsx:7:2 › renders the production chat composer in the VS Code light theme (3.8s)
✓ 4 [chromium] › src/components/chat/__tests__/ChatTextArea.visual.tsx:7:2 › renders the production chat composer in the VS Code high-contrast theme (3.3s)
✓ 5 [chromium] › src/components/chat/__tests__/ChatTextArea.visual.tsx:7:2 › renders the production chat composer in the VS Code high-contrast-light theme (3.5s)
✓ 6 [chromium] › src/components/chat/__tests__/IgnoredDisabledToolsNotice.visual.tsx:6:2 › renders the ignored disabled-tools warning in the VS Code dark theme (6.5s)
✓ 7 [chromium] › src/components/chat/__tests__/IgnoredDisabledToolsNotice.visual.tsx:6:2 › renders the ignored disabled-tools warning in the VS Code light theme (5.4s)
✓ 8 [chromium] › src/components/chat/__tests__/IgnoredDisabledToolsNotice.visual.tsx:6:2 › renders the ignored disabled-tools warning in the VS Code high-contrast theme (3.9s)
✓ 9 [chromium] › src/components/chat/__tests__/IgnoredDisabledToolsNotice.visual.tsx:6:2 › renders the ignored disabled-tools warning in the VS Code high-contrast-light theme (4.0s)
✓ 10 [chromium] › src/components/chat/__tests__/ThemeAwareControls.visual.ts...
Additional context used
Path-based instructions: 6
Check persistence and lifecycle invariants: awaited atomic writes, rollback or explicit partial-failure behavior, cross-window state consistency, stale listeners/watchers, cancellation, idempotency, and safe restart/resume without lost or d...
Require regression coverage at the lowest valid harness with behavior-focused assertions, including relevant negative, error, false/unset, and boundary cases.
[warning] 90-90: Mutation test advisory
src/services/mcp/utils/callbackServer.ts:90: Survived StringLiteral mutant (replacement: ""). See the job summary for the complete list and resolution guidance.
📝 Summary
Summary by CodeRabbit
Bug Fixes
OAuth sign-in now reports callback-listener failures consistently, including when a failure occurs before the app is waiting for a callback.
After a failed callback attempt, a new attempt can begin once the previous listener has finished shutting down.
Closing or cancelling an OAuth flow waits for cleanup, preventing leftover errors from disrupting later attempts.
Requests to a callback listener after it has completed now receive a clear “Not found” response.
The provider retains callback listener failures that occur before a wait, reports each retained failure once, and starts a later listener after cleanup. Closing the provider clears unreported failures and waits for listener cleanup. The callback server returns 404 for requests received after it resolves.
Changes: OAuth callback lifecycle
Layer / File(s)
Summary
Listener failure state and retry cleanup src/services/mcp/McpOAuthClientProvider.ts, src/services/mcp/__tests__/McpOAuthClientProvider.spec.ts
The provider tracks callback listener failures and pending cleanup. Tests cover failures before or during waits, retries, cleanup errors, and waiting for cleanup before reusing a listener port.
Wait result and provider shutdown src/services/mcp/McpOAuthClientProvider.ts, src/services/mcp/__tests__/McpOAuthClientProvider.spec.ts, src/services/mcp/__tests__/McpHub.spec.ts
waitForAuthCode() reports an unreported failure once. close() clears unreported failures and waits for cleanup. Tests verify close behavior and that a callback timeout stops the OAuth flow before token exchange or reconnection.
Response after callback resolution src/services/mcp/utils/callbackServer.ts, src/services/mcp/utils/__tests__/callbackServer.listener.spec.ts
The callback server responds with 404 to requests received after it resolves. Loopback tests cover canceled and successful callbacks.
Zoo-Code-Org/Zoo-Code#2187: The changes report an early callback listener failure on the next wait, then allow a later attempt to start a new listener.
Possibly related PRs
Zoo-Code-Org/Zoo-Code#2129: It introduced the callback listener lifecycle that this change extends with retained failures and cleanup coordination.
Merge Risk: Minimal · previous review 09c80
The late-request response is covered by the cancellation test. No actionable merge-blocking issue remains in the supplied changes.
Pre-merge checks: 8
Check name
Status
Explanation
Title check
The title "Report an MCP OAuth callback failure before a retry" matches the main change. The PR keeps callback-listener failures that happen before any waitForAuthCode() caller waits, reports each one…
Description check
The description follows the repository template. It links the issue (Closes: #2187), explains the how with clear state-change details and reviewer focus areas, and gives a detailed test procedure with…
Linked Issues check
[#2187] The reviewed head meets the coding requirements in McpOAuthClientProvider.ts. (1) Failure before a wait: the rejection handler stores the failed promise in _unreportedAuthCodeFailure when no c…
Out of Scope Changes check
The changes stay within #2187. Production changes in McpOAuthClientProvider.ts implement the callback-listener failure lifecycle. The callbackServer.ts change returns HTTP 404 for requests that arrive…
Regression Evidence
Focused coverage exists for the changed behavior. McpOAuthClientProvider.spec.ts covers failures before and during waits, one-time reporting, retry, cleanup ordering, cleanup errors, stale-failure d…
Security Boundaries
No changed path meets the security failure conditions. The provider changes only retain callback failures, detach and clean up failed listeners, and coordinate retries. The callback-server change retu…
Persistence Integrity
No changed persistence path exists. The PR changes in-memory callback state and listener cleanup, plus late HTTP responses. saveTokens() and SecretStorage reads/writes are unchanged, and the new cal…
Lifecycle Resource Cleanup
No concrete changed lifecycle leak or duplicate-work path is present. A failed callback promise detaches its listener and calls _stopDetachedListener() (McpOAuthClientProvider.ts:281-302). Replaceme…
Full details: Title check
Explanation
The title "Report an MCP OAuth callback failure before a retry" matches the main change. The PR keeps callback-listener failures that happen before any waitForAuthCode() caller waits, reports each one once on the next call, and then allows a fresh listener. The title is specific, short, and in active voice, and a teammate scanning history would understand the primary change.
Full details: Description check
Explanation
The description follows the repository template. It links the issue (Closes: #2187), explains the how with clear state-change details and reviewer focus areas, and gives a detailed test procedure with results. It includes the completed pre-submission checklist, visual snapshot, documentation, and additional notes sections. The Get in Touch section lists a GitHub handle, not a Discord username as the template asks. This is a minor gap and does not change the outcome. The description uses short, direct sentences in line with the Simplified Technical English request.
Full details: Linked Issues check
Explanation
[#2187] The reviewed head meets the coding requirements in McpOAuthClientProvider.ts. (1) Failure before a wait: the rejection handler stores the failed promise in _unreportedAuthCodeFailure when no caller awaited it (_awaitedAuthCodePromise differs). The next waitForAuthCode() returns that failure once and skips _ensureCallbackServer(), so no listener starts. (2) Later attempt: the consumed failure is cleared, and _server is null, so the following call starts a new listener through _ensureCallbackServer(). (3) Waiting caller: the awaited promise is not recorded as unreported, so the waiter receives the original error. (4) Cleanup: the failed listener is detached and stopped through stopCallbackServerIgnoringErrors(), so cleanup errors do not replace the callback error. _doStartCallbackServer() waits on _listenerCleanup before it starts a replacement. (5) Unhandled rejections: the .catch handler remains attached. close() clears the unreported failure, detaches the listener before cancel, and waits for cleanup. The PR summary lists provider tests for both timing orders, retry, port reuse, cancellation, and cleanup, and an McpHub test for error reporting and disconnect. This assessment relies on that summary and the prior review. The test files were not read directly in this review.
Full details: Out of Scope Changes check
Explanation
The changes stay within #2187. Production changes in McpOAuthClientProvider.ts implement the callback-listener failure lifecycle. The callbackServer.ts change returns HTTP 404 for requests that arrive after the callback resolves. This lets open connections end, so stopCallbackServer() can finish when a listener closes. That supports the requirement to always close a failed listener. Its loopback tests in callbackServer.listener.spec.ts cover this path. The McpHub test checks error propagation and disconnect behavior. The mock reset and the test-local mock setup support the provider tests. No unrelated behavior appears in the reviewed changes.
Full details: Regression Evidence
Explanation
Focused coverage exists for the changed behavior. McpOAuthClientProvider.spec.ts covers failures before and during waits, one-time reporting, retry, cleanup ordering, cleanup errors, stale-failure discard, close behavior, cancellation, success callbacks, and unhandled-rejection protection. McpHub.spec.ts covers error recording and disconnect behavior. callbackServer.listener.spec.ts uses a real loopback server to verify 404 responses for late requests and normal callback handling. No durable application UI change requires a Playwright snapshot.
Full details: Security Boundaries
Explanation
No changed path meets the security failure conditions. The provider changes only retain callback failures, detach and clean up failed listeners, and coordinate retries. The callback-server change returns a fixed 404 response for late requests. Existing callback input still requires the expected OAuth state before accepting a code, and no changed code exposes secrets or bypasses approval or allowlist controls.
Full details: Persistence Integrity
Explanation
No changed persistence path exists. The PR changes in-memory callback state and listener cleanup, plus late HTTP responses. saveTokens() and SecretStorage reads/writes are unchanged, and the new callback failure state is not persisted. Therefore the explicit persistence-integrity failure conditions are not introduced.
Full details: Lifecycle Resource Cleanup
Explanation
No concrete changed lifecycle leak or duplicate-work path is present. A failed callback promise detaches its listener and calls _stopDetachedListener() (McpOAuthClientProvider.ts:281-302). Replacement startup waits for _listenerCleanup before binding again (lines 253-266). close() detaches the active listener before cancellation and awaits cleanup (lines 690-712). The callback server clears its timer on cancellation or callback and now answers late requests with 404 so connections can close (callbackServer.ts:70-91).
Finishing Touches: 💡 1
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Actionable comments posted: 1
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Inline comments:
Review comments at @src/services/mcp/__tests__/McpOAuthClientProvider.spec.ts:
- Around line 1547-1548: Update the request handler used by stopCallbackServer
to send and end a response when a request arrives after the callback has already
been resolved, allowing the connection to close. Add a regression test using a
real HTTP listener in a spec that does not mock http, asserting that
stopCallbackServer resolves after the late request receives a response.
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Additional context used
Path-based instructions: 6
Check persistence and lifecycle invariants: awaited atomic writes, rollback or explicit partial-failure behavior, cross-window state consistency, stale listeners/watchers, cancellation, idempotency, and safe restart/resume without lost or d...
Require regression coverage at the lowest valid harness with behavior-focused assertions, including relevant negative, error, false/unset, and boundary cases.
[warning] 257-257: Mutation test advisory
src/services/mcp/McpOAuthClientProvider.ts:257: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.
[warning] 298-298: Mutation test advisory
src/services/mcp/McpOAuthClientProvider.ts:298: 3 mutation test gaps; example: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.
[warning] 556-556: Mutation test advisory
src/services/mcp/McpOAuthClientProvider.ts:556: 2 mutation test gaps; example: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.
[warning] 709-709: Mutation test advisory
src/services/mcp/McpOAuthClientProvider.ts:709: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.
A callback listener can fail before waitForAuthCode() starts to wait.
The provider then started a new listener and hid the original error
for up to five minutes.
- Keep a failure that occurs while no caller waits.
- Report that failure once on the next waitForAuthCode() call.
- Start a new listener on the call after that.
- Close each failed listener. Ignore errors from that cleanup.
- Start a new listener only after the old listener closes.
- Discard a kept failure when a new listener starts or close() runs.
After the callback wait ends, the listener ignored a new request and
sent no response. The connection stayed open, so stopCallbackServer()
could not finish. This delayed close(), the OAuth error, and a retry.
- Send 404 to a request that arrives after the callback wait ends.
- Add a test that uses a real loopback listener.
* Report an MCP OAuth callback failure before a retry
A callback listener can fail before waitForAuthCode() starts to wait.
The provider then started a new listener and hid the original error
for up to five minutes.
- Keep a failure that occurs while no caller waits.
- Report that failure once on the next waitForAuthCode() call.
- Start a new listener on the call after that.
- Close each failed listener. Ignore errors from that cleanup.
- Start a new listener only after the old listener closes.
- Discard a kept failure when a new listener starts or close() runs.
* Answer late MCP OAuth callback requests
After the callback wait ends, the listener ignored a new request and
sent no response. The connection stayed open, so stopCallbackServer()
could not finish. This delayed close(), the OAuth error, and a retry.
- Send 404 to a request that arrives after the callback wait ends.
- Add a test that uses a real loopback listener.
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Related GitHub Issue
Closes: #2187
Description
This change makes
waitForAuthCode()report a callback listener failure that occurs before a caller waits. It follows the review discussion in #2129.Before this change, the rejection handler cleared the listener. The next
waitForAuthCode()call then started a new listener and waited for up to five minutes. The original error was not reported.waitForAuthCode()call. That call does not start a new listener.close()runs. An old failure cannot affect a new attempt.close()before the cancel. The provider then does not keep the cancellation as a failure..catchhandler that prevents unhandled promise rejections.Reviewers should check the state changes in
waitForAuthCode(), in the rejection handler in_doStartCallbackServer(), and inclose().The test setup now resets the callback server mocks before each test. One existing test used a mock from an earlier test. That test now sets up its own mock.
Test Procedure
cd src && npx vitest run services/mcp.pnpm --dir src run check-types.pnpm mcp:integration-check.New tests cover these cases:
redirectToAuthorization()orclose()discards a kept failure.close()waits until a failed listener closes.close(), a new attempt gets a new listener. This is true when cleanup succeeds and when it fails.waitForAuthCode()rejects.Results:
main. They pass with this change.Pre-Submission Checklist
Visual Snapshots
Not applicable. This PR has no UI changes.
Videos (interaction / animation only)
Not applicable. This PR has no UI interaction changes.
Documentation Updates
Additional Notes
The source branch contains one commit. It is based on the current upstream
mainbranch.In Node,
server.close()does not reject when the listener is already closed. The cleanup error handling is a safeguard. A test covers it with a mocked rejection.Get in Touch
GitHub: @SoccerField24x7