issues: 1496652622
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| id | node_id | number | title | user | state | locked | assignee | milestone | comments | created_at | updated_at | closed_at | author_association | pull_request | body | repo | type | active_lock_reason | performed_via_github_app | reactions | draft | state_reason |
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| 1496652622 | I_kwDOBm6k_c5ZNRtO | 1955 | invoke_startup() is not run in some conditions, e.g. gunicorn/uvicorn workers, breaking lots of things | 32839123 | closed | 0 | 36 | 2022-12-14T13:39:56Z | 2022-12-19T04:34:16Z | 2022-12-18T02:45:18Z | NONE | In the past (pre-september 14, #1809) I had a running deployment of Datasette on Azure WebApps by emulating the call in cli.py to Gunicorn: `gunicorn -w 2 -k uvicorn.workers.UvicornWorker app:app`. My most recent deployment, however, fails loudly by shouting that `Datasette.invoke_startup()` was not called. It does not seem to be possible to call `invoke_startup` when running using a uvicorn command directly like this (I've reproduced this locally using `uvicorn`). Two candidates that I have tried: * Uvicorn has a `--factory` option, but the app factory has to be synchronous, so no `await invoke_startup` there * `asyncio.get_event_loop().run_until_complete` is also not an option because `uvicorn` already has the event loop running. One additional option is: * Use Gunicorn's [server hooks](https://docs.gunicorn.org/en/stable/settings.html#server-hooks) to call `invoke_startup`. These are also synchronous, but I might be able to get ahead of the event loop starting here. In my current deployment setup, it does not appear to be possible to use `datasette serve` directly, so I'm stuck either * Trying to rework my complete deployment setup, for instance, using Azure functions as described [here](https://github.com/simonw/azure-functions-datasette)) * Or dig into the ASGI spec and write a wrapper for the sole purpose of launching Datasette using a direct Uvicorn invocation. Questions for the maintainers: * Is this intended behaviour/will not support/etc.? If so, I'd be happy to add a PR with a couple lines in the documentation. * if this is not intended behaviour, what is a good way to fix it? I could have a go at the ASGI spec thing (I think the Azure Functions thing is related) and provide a PR with the wrapper here, but I'm all ears! Almost forgot, minimal reproducer: ```python from datasette import Datasette ds = Datasette(files=['./global-power-plants.db'])] app = ds.app() ``` Save as app.py in the same folder as global-power-plants.db, and then try running `uvicorn app:app`. Opening the resulting Datasette instance in the browser will show the error message. | 107914493 | issue | {"url": "https://api.github.com/repos/simonw/datasette/issues/1955/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | completed |