fix(worker, shared): Handle urllib3 ReadTimeoutError during report chunk retrieval

[sentry]

Fixes WORKER-Y8M. The issue was that: ReportService.get_existing_report_for_commit fails to catch ReadTimeoutError during GCS chunk retrieval, crashing UploadFinisher.

• Added urllib3.exceptions import to apps/worker/services/report/__init__.py.
• Implemented urllib3.exceptions.ReadTimeoutError handling in apps/worker/services/report/__init__.py to log a warning and return None when a timeout occurs while reading report chunks.
• Added urllib3.exceptions import to libs/shared/shared/reports/api_report_service.py.
• Implemented urllib3.exceptions.ReadTimeoutError handling in libs/shared/shared/reports/api_report_service.py to log a warning and return None when a timeout occurs while reading report chunks.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 13513494

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Note

Low Risk
Low risk: adds defensive handling for storage read timeouts, changing behavior from crashing to logging and returning None (which may skip report-based processing on transient failures).

Overview
Prevents worker/shared report-building code from crashing when chunk retrieval from storage times out.

Both ReportService.get_existing_report_for_commit (worker) and build_report_from_commit (shared) now catch urllib3.exceptions.ReadTimeoutError, log a warning with commit/repo context, and return None to allow downstream flows (e.g., upload finishing/comparisons) to continue gracefully.

^{Reviewed by Cursor Bugbot for commit cf82439. Bugbot is set up for automated code reviews on this repo. Configure here.}

[sentry]

Bug: The exception handler for urllib3.exceptions.ReadTimeoutError is incomplete. Due to the Minio client's retry configuration, a urllib3.exceptions.MaxRetryError will be raised, which is not caught.
_{Severity: HIGH}

Suggested Fix

Update the except block to also catch urllib3.exceptions.MaxRetryError. This will ensure that read timeouts are handled correctly even after all retries from the Minio client's urllib3 configuration are exhausted.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: apps/worker/services/report/__init__.py#L346-L348

Potential issue: The Minio client is configured with `Retry(total=5)`. When a
`ReadTimeoutError` occurs while reading data chunks, `urllib3` retries the operation. If
all retries fail, `urllib3` raises a `MaxRetryError` wrapping the original
`ReadTimeoutError`. The new `try...except` block only catches
`urllib3.exceptions.ReadTimeoutError`, not `urllib3.exceptions.MaxRetryError`. This will
result in an unhandled exception, causing the worker to crash, which is the exact issue
the change was intended to prevent.

_{Did we get this right? 👍 / 👎 to inform future reviews.}

[sentry]

Codecov Report

❌ Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.24%. Comparing base (0ad8a0c) to head (cf82439).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
libs/shared/shared/reports/api_report_service.py	0.00%	4 Missing ⚠️
apps/worker/services/report/__init__.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #854      +/-   ##
==========================================
- Coverage   92.25%   92.24%   -0.02%     
==========================================
  Files        1307     1307              
  Lines       48017    48025       +8     
  Branches     1636     1636              
==========================================
+ Hits        44299    44301       +2     
- Misses       3407     3413       +6     
  Partials      311      311              

Flag	Coverage Δ
apiunit	96.35% <ø> (ø)
sharedintegration	36.88% <0.00%> (-0.02%)	⬇️
sharedunit	84.88% <0.00%> (-0.03%)	⬇️
workerintegration	58.53% <25.00%> (-0.01%)	⬇️
workerunit	90.38% <50.00%> (-0.02%)	⬇️

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[codecov-notifications]

Codecov Report

❌ Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
libs/shared/shared/reports/api_report_service.py	0.00%	4 Missing ⚠️
apps/worker/services/report/__init__.py	50.00%	2 Missing ⚠️

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[codspeed-hq]

Merging this PR will not alter performance

✅ 9 untouched benchmarks

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_{Comparing seer/fix/report-read-timeout (cf82439) with main (0ad8a0c)}