Bucky789 commented on code in PR #60963:
URL: https://github.com/apache/airflow/pull/60963#discussion_r2733486701
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providers/imap/src/airflow/providers/imap/hooks/imap.py:
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@@ -240,12 +260,17 @@ def _retrieve_mails_attachments_by_name(
return all_matching_attachments
- def _list_mail_ids_desc(self, mail_filter: str) -> Iterable[str]:
+ def _list_mail_ids_desc(self, mail_filter: str, max_mails: int | None =
None) -> Iterable[str]:
if not self.mail_client:
raise RuntimeError("The 'mail_client' should be initialized
before!")
_, data = self.mail_client.search(None, mail_filter)
mail_ids = data[0].split()
- return reversed(mail_ids)
+ mail_ids_desc = reversed(mail_ids)
Review Comment:
Thanks both for the insights — this is helpful.
I see @uranusjr’s point about intent and maintainability: since max_mails is
meant as a performance and scoping feature, taking the last N IDs first and
then reversing them makes the logic more explicit (“latest N, processed
newest-first”) and avoids conceptual overhead.
At the same time, I also understand @vaefremov95’s clarification that
reversed() combined with itertools.islice() is lazy and does not allocate a new
list or reorder data in memory, unlike slicing. From a purely technical
standpoint, that approach is valid and efficient.
Given Airflow’s emphasis on readability and long-term maintainability, I’m
happy to align with whichever direction you prefer. If slicing-first is the
preferred approach, I can update the logic along these lines:
```
_, data = self.mail_client.search(None, mail_filter)
mail_ids = data[0].split()
if max_mails is not None:
mail_ids = mail_ids[-max_mails:]
return reversed(mail_ids)
```
This keeps the behavior clear (“take the latest N, then process
newest-first”) and avoids islice() altogether.
Please let me know which approach you’d like me to adopt, and I’ll update
the implementation accordingly.
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