Add a `_shutting_down` flag to `TelegramClient` to suppress disconnect handling during intentional shutdown. The flag is set before sending SIGTERM in `_restart_app` and checked in `_on_disconnect` to ignore those events. Minor formatting adjustments were also applied to `api_server.py` (try block and `uvicorn.run` arguments).
Add monotonic timing instrumentation around media download, semaphore
wait, HTML sanitization, and media file persistence. Log warnings when
operations exceed defined thresholds and provide diagnostic info for
task queue size. This aids performance monitoring without altering
behaviour.
Separate live HTTP media requests and background cache workers by introducing `HTTP_DOWNLOAD_SEMAPHORE` and `BACKGROUND_DOWNLOAD_SEMAPHORE`. Remove the previous global `DOWNLOAD_SEMAPHORE`, diagnostic event‑loop monitor, and related logging. Refactor `download_media_file` to handle large videos with temporary files, clean up zero‑size cache entries, and update access timestamps without semaphore tracking. Adjust background worker and request handling to use the new semaphores, simplifying concurrency control and eliminating unnecessary diagnostics.
Introduce a periodic event‑loop monitor that logs active tasks, semaphore
state, queue size and thread‑pool activity. Track the number of coroutine
waiters for the download semaphore and emit detailed diagnostic logs in
download handling and the background worker. This aids debugging of
concurrency and resource‑usage issues.
Add queue-based background download system to improve performance and reliability:
- Introduce DOWNLOAD_SEMAPHORE to limit concurrent downloads to 3
- Add asyncio.Queue (maxsize 100) with dedicated worker for background processing
- Implement safe_get_messages and safe_download_media wrappers with timeout protection (30s and 120s)
- Add retry logic for KeyError auth failures with 5s backoff
- Replace synchronous sequential downloads with asynchronous queued processing
- Prevent event loop blocking by queuing files instead of immediate download
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