fix: prevent indexer hanging on OpenAI insufficient quota errors (#5350)

[hannesrudolph]

Description

This PR fixes an issue where the code indexer would hang indefinitely when using OpenAI embeddings with an account that has insufficient credits/quota. Previously, all HTTP 429 errors were treated as retryable rate-limit errors, causing the indexer to retry endlessly even when the error was due to insufficient funds.

Changes Made

1. Enhanced Error Detection

• Added isInsufficientQuotaError() method to both OpenAI embedders to detect quota-related 429 errors
• The method checks for keywords like "insufficient_quota", "quota exceeded", "insufficient funds", "billing", etc.
• Handles various error response formats from the OpenAI API

2. Modified Retry Logic

• Updated _embedBatchWithRetries() in both openai.ts and openai-compatible.ts
• Quota errors now throw immediately without retrying
• Regular rate limit errors continue to retry with exponential backoff as before

3. User-Friendly Error Messages

• Added new localized error message: "Failed to create embeddings: Insufficient quota. Please check your OpenAI account balance and add credits to continue."
• Translations added for all supported languages

4. Comprehensive Test Coverage

• Added test cases to verify quota errors fail immediately without retries
• Added test cases to ensure regular rate limits still trigger retry logic
• All existing tests continue to pass

Testing

Unit Tests

• ✅ OpenAI Embedder: 27 tests passed
• ✅ OpenAI Compatible Embedder: 31 tests passed
• ✅ New test cases verify quota error detection works correctly
• ✅ Existing retry logic for regular rate limits remains functional

Code Quality

• ✅ ESLint: No errors or warnings
• ✅ TypeScript: No type errors
• ✅ All existing functionality preserved (no regressions)

Verification

Acceptance Criteria Met:

1. ✅ Indexer fails immediately on insufficient quota errors
2. ✅ Clear error message displayed to users
3. ✅ Regular rate limits continue to retry
4. ✅ All tests pass
5. ✅ No regression in existing functionality

Manual Testing Recommended:

• Test with an OpenAI account that has exhausted its credits
• Verify the error message appears quickly without hanging
• Test with regular rate limits to ensure retry logic still works

Notes

• The implementation is backward compatible and only adds new error detection logic
• The solution handles various OpenAI error response formats for robustness
• All translations have been added for the new error message in all supported languages

Fixes #5350

---

Important

Fixes indexer hanging by detecting and handling OpenAI insufficient quota errors without retrying, with enhanced user feedback and test coverage.

• Behavior:
  • Adds isInsufficientQuotaError() in quota-detection.ts to identify quota-related 429 errors.
  • Updates _embedBatchWithRetries() in openai.ts and openai-compatible.ts to throw on quota errors without retrying.
  • Continues retrying on regular rate limit errors with exponential backoff.
• User Feedback:
  • Adds localized error message for insufficient quota in multiple language files.
• Testing:
  • Adds tests in openai.spec.ts and openai-compatible.spec.ts to verify immediate failure on quota errors and retry logic for rate limits.
  • Ensures all existing tests pass without regression.

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[delve-auditor]

✅ No security or compliance issues detected. Reviewed everything up to 3905dcb.

Security Overview

• 🔎 Scanned files: 23 changed file(s)

Detected Code Changes

Change Type	Relevant files
Enhancement	► embeddings.json     Add insufficient quota error messages across language files ► openai-compatible.ts     Add quota detection for error handling ► openai.ts     Add quota detection for error handling ► quota-detection.ts     Add utility for detecting quota-related errors

Reply to this PR with @delve-auditor followed by a description of what change you want and we'll auto-submit a change to this PR to implement it.

[Copilot]

Pull Request Overview

This PR prevents the code indexer from hanging on OpenAI quota errors by detecting insufficient-quota errors and failing immediately, while preserving existing retry behavior for rate limits.

• Added isInsufficientQuotaError to both embedders and updated retry logic to throw on quota errors
• Introduced user-friendly localized error messages and tests for quota vs. rate-limit behavior
• Enhanced diff view to preserve editor focus and updated tooling calls to await the async scroll method

Reviewed Changes

Copilot reviewed 28 out of 28 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/services/code-index/embedders/openai.ts	Detect quota errors and skip retries in _embedBatchWithRetries
src/services/code-index/embedders/openai-compatible.ts	Same quota-detection patch for the compatible embedder
src/services/code-index/embedders/tests/openai.spec.ts	Added tests for insufficient-quota and rate-limit scenarios
src/services/code-index/embedders/tests/openai-compatible.spec.ts	Added analogous tests
src/integrations/editor/DiffViewProvider.ts	Added preserveFocus and focus-restoration logic, made scroll async
src/integrations/editor/tests/DiffViewProvider.spec.ts	Updated tests to expect preserveFocus: true
src/core/tools/writeToFileTool.ts	Awaited the newly async scrollToFirstDiff call
src/core/tools/searchAndReplaceTool.ts	Awaited the newly async scrollToFirstDiff call
src/core/tools/insertContentTool.ts	Awaited the newly async scrollToFirstDiff call
src/i18n/locales/*/embeddings.json	Added insufficientQuota translation in all supported languages

[daniel-lxs]

It looks like the changes for focus preservation have been included in this pull request. Since there is a separate PR for that work, could you please remove the unrelated focus-preservation changes from this one to keep it focused on the OpenAI quota issue?

[ellipsis-dev]

Consider checking error.response?.status in addition to error.status to robustly detect 429 errors when the status code is nested under response.

Suggested change

	if (error?.status !== 429) return false
	if (error?.status !== 429 && error?.response?.status !== 429) return false

[hannesrudolph]

Closed in favour of #5404