chore: Implement Synchronizer protocol for polling data source #345
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kinyoklion
reviewed
Aug 11, 2025
| next(sync) | ||
| assert False, "Expected StopIteration" | ||
| except StopIteration: | ||
| pass No newline at end of file |
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nit: Newline at end of file.
kinyoklion
approved these changes
Aug 11, 2025
| ) | ||
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| if self._event.wait(self._poll_interval): | ||
| break |
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Bug: PollingDataSource Fails to Handle Exceptions and Retries Prematurely
The PollingDataSource.sync() method has two issues:
- It does not catch exceptions raised by
requester.fetch(). Network errors (e.g., timeouts, connection failures) will propagate, terminating the synchronizer generator instead of yielding anINTERRUPTEDorOFFUpdate. This can crash the polling process in production. - On recoverable HTTP errors,
sync()immediately retries without waiting for the configured poll interval. This creates a tight loop that can excessively hammer the polling endpoint and consume CPU.
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