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Fix #2723: Retry on HTTP 400 failedPrecondition#2730

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codeXsidd wants to merge 1 commit intogoogleapis:mainfrom
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Fix #2723: Retry on HTTP 400 failedPrecondition#2730
codeXsidd wants to merge 1 commit intogoogleapis:mainfrom
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@codeXsidd codeXsidd commented Mar 21, 2026

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Fixes #<issue_number_goes_here> 🦕

@codeXsidd codeXsidd requested a review from a team as a code owner March 21, 2026 04:41
@product-auto-label product-auto-label bot added the size: m Pull request size is medium. label Mar 21, 2026
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Summary of Changes

Hello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the client's robustness by introducing automatic retry capabilities for specific HTTP 400 "Bad Request" errors. Previously, retries were primarily handled for certain 403 "Forbidden" errors. This change specifically targets failedPrecondition and preconditionFailed reasons within 400 responses, ensuring more resilient API interactions against transient precondition failures and improving the overall reliability of the client.

Highlights

  • Retry Logic Enhancement: Expanded the HTTP retry mechanism to include HTTP 400 (Bad Request) status codes, specifically for failedPrecondition and preconditionFailed error reasons.
  • Error Handling: Modified the _should_retry_response function to differentiate retry conditions for 403 Forbidden and 400 Bad Request errors based on their specific reasons.
  • Test Coverage: Added a new test case to verify the correct retry behavior when an HTTP 400 response with a failedPrecondition reason is encountered.
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Code Review

This pull request correctly adds retry logic for HTTP 400 errors with the failedPrecondition reason, which is a useful enhancement for handling transient errors. The implementation is sound and is accompanied by a new unit test that verifies the new behavior. I have one suggestion to refactor the retry condition logic to make it more data-driven and easier to extend in the future.

Comment on lines +140 to +149
if resp_status == http_client.FORBIDDEN:
LOGGER.warning('Encountered 403 Forbidden with reason "%s"', reason)
# Only retry on rate limit related failures.
if reason in ("userRateLimitExceeded", "rateLimitExceeded"):
return True
elif resp_status == http_client.BAD_REQUEST:
LOGGER.warning('Encountered 400 Bad Request with reason "%s"', reason)
# Only retry on precondition failures.
if reason in ("failedPrecondition", "preconditionFailed"):
return True

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medium

This if/elif block for handling retryable reasons can be refactored to be more data-driven. Using a dictionary to map status codes to their retryable reasons would make this logic more concise and easier to extend with new status codes or reasons in the future.

Suggested change
if resp_status == http_client.FORBIDDEN:
LOGGER.warning('Encountered 403 Forbidden with reason "%s"', reason)
# Only retry on rate limit related failures.
if reason in ("userRateLimitExceeded", "rateLimitExceeded"):
return True
elif resp_status == http_client.BAD_REQUEST:
LOGGER.warning('Encountered 400 Bad Request with reason "%s"', reason)
# Only retry on precondition failures.
if reason in ("failedPrecondition", "preconditionFailed"):
return True
RETRYABLE_REASONS = {
http_client.FORBIDDEN: (
{'userRateLimitExceeded', 'rateLimitExceeded'},
'Encountered 403 Forbidden with reason "%s"',
),
http_client.BAD_REQUEST: (
{'failedPrecondition', 'preconditionFailed'},
'Encountered 400 Bad Request with reason "%s"',
),
}
if resp_status in RETRYABLE_REASONS:
reasons, log_message = RETRYABLE_REASONS[resp_status]
if reason in reasons:
LOGGER.warning(log_message, reason)
return True

@codeXsidd codeXsidd closed this Mar 21, 2026
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