kirs-hi ad64e17a34 fix: avoid KeyError on cancel and infinite loop in image compression ...

Two independent robustness fixes:

1. ChatChannel.cancel_session / cancel_all_session raised KeyError when a
   session existed in self.sessions but no future had been dispatched yet.
   self.sessions[sid] is created in produce(), but self.futures[sid] is only
   created later in consume() on first dispatch. Cancelling in that window
   (e.g. user sends a message then immediately cancels) crashed the cancel
   path. Use self.futures.get(sid, []) so an absent entry is a no-op.

2. compress_imgfile decremented JPEG quality by 5 with no lower bound. For an
   image that cannot be compressed below max_size, quality went 0, negative,
   ... — the loop never terminated and passed invalid quality values to PIL.
   Add a min_quality floor (10) and return the best effort once reached.

Adds tests/test_robustness_fixes.py covering both paths (5 tests).

2026-06-12 11:03:04 +08:00

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