aiohttp ClientTimeout uses BaseTimerContext which calls
loop.call_later() internally. When invoked via
asyncio.run_coroutine_threadsafe() from cron jobs, this
triggers "Timeout context manager should be used inside a task"
errors, causing message delivery failures.
Replace all direct ClientTimeout usage with asyncio.wait_for():
- _upload_ciphertext: CDN upload (120s timeout)
- _download_bytes: CDN download (configurable timeout)
- _download_remote_media: remote media fetch (30s timeout)
Also set total=None on _send_session to disable aiohttp built-in
timeout, and change trust_env=True to False to bypass proxy for
WeChat CDN connections.
chenlinfeng
3a0d52d579