Async-native file download routes for Girder, bypassing WSGIMiddleware buffering
Project description
Girder Async Routes
Problem description
When running Girder with gunicorn girder.asgi:app -w 4 -k uvicorn.workers.UvicornWorker -b 0.0.0.0:8080, large file downloads experience producer-consumer rate mismatch issues. This occurs because:
- Architecture Flow: File downloads → CherryPy (WSGI) → WSGIMiddleware → Starlette (ASGI) → Uvicorn
- Sync Generator Issue: The synchronous generator in
filesystem_assetstore_adapter.pydoesn't properly communicate backpressure to the async framework - Buffering Problems: WSGIMiddleware may buffer entire responses in memory, causing:
- High memory usage for large files
- Slow downloads
- Potential timeouts
- Worker hangs
This plugin adds support for asynchronous routes in Girder to circumvent these issues and improve performance for large file downloads.
Usage
gunicorn girder_async_routes.asgi:app -w 4 -k uvicorn.workers.UvicornWorker -b 0.0.0.0:8080
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