This issue is caused by a race condition. When a large image is served to the client, it is done using a streaming `FileResponse`. This concurrently serves the image straight from disk. The file is kept open by FastAPI until the image is fully served.
When a user deletes an image before the file is done serving, the delete fails because the file is still held by FastAPI.
To reproduce the issue:
- Create a very large image (8k reliably creates the issue).
- Create a smaller image, so that the first image in the gallery is not the large image.
- Refresh the app. The small image should be selected.
- Select the large image and immediately delete it. You have to be fast, to delete it before it finishes loading.
- In the terminal, we expect to see an error saying `Failed to delete image file`, and the image does not disappear from the UI.
- After a short wait, once the image has fully loaded, try deleting it again. We expect this to work.
The workaround is to instead serve the image from memory.
Loading the image to memory is very fast, so there is only a tiny window in which we could create the race condition, but it technically could still occur, because FastAPI is asynchronous and handles requests concurrently.
Once we load the image into memory, deletions of that image will work. Then we return a normal `Response` object with the image bytes. This is essentially what `FileResponse` does - except it uses `anyio.open_file`, which is async.
The tradeoff is that the server thread is blocked while opening the file. I think this is a fair tradeoff.
A future enhancement could be to implement soft deletion of images (db is already set up for this), and then clean up deleted image files on startup/shutdown. We could move back to using the async `FileResponse` for best responsiveness in the server without any risk of race conditions.
For some reason, I started getting this indefinite hang when the app checks if port 9090 is available. After some fiddling around, I found that adding a timeout resolves the issue.
I confirmed that the util still works by starting the app on 9090, then starting a second instance. The second instance correctly saw 9090 in use and moved to 9091.
## Summary
This PR changes the handling of invalid model configs in the DB to log a
warning rather than crashing the app.
This change is being made in preparation for some upcoming new model
additions. Previously, if a user rolled back from an app version that
added a new model type, the app would not launch until the DB was fixed.
This PR changes this behaviour to allow rollbacks of this type (with
warnings).
**Keep in mind that this change is only helpful to users _rolling back
to a version that has this fix_. I.e. it offers no help in the first
version that includes it.**
## QA Instructions
1. Run the Spandrel model branch, which adds a new model type
https://github.com/invoke-ai/InvokeAI/pull/6556.
2. Add a spandrel model via the model manager.
3. Rollback to main. The app will crash on launch due to the invalid
spandrel model config.
4. Checkout this branch. The app should now run with warnings about the
invalid model config.
## Checklist
- [x] _The PR has a short but descriptive title, suitable for a
changelog_
- [ ] _Tests added / updated (if applicable)_
- [x] _Documentation added / updated (if applicable)_
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