Logging in code disables Starlette logging when called programatically

So, here’s the simplest code, using the quickstart example from Starlette’s documentation, in a file test.py:

from starlette.applications import Starlette
from starlette.responses import JSONResponse
import uvicorn
import logging

app = Starlette()


@app.route('/')
async def homepage(request):
    return JSONResponse({'hello': 'world'})


if __name__ == '__main__':
    logging.info('Starting server')
    uvicorn.run(app, host='0.0.0.0', port=8000, log_level='debug')

If we run this directly, with python -m test, there is no logging out put in the console. If we either disable the penultimate line (logging.info(...), or if we run it externally (uvicorn test:app), we get the regular logging output:

$ uvicorn test:app
INFO: Started server process [18682]
INFO: Waiting for application startup.
INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)

So, in the case of running uvicorn programatically and logging stuff in our code, the logging fails to appear. The log_level argument has no effect either way.

[tomchristie]

Resolved with uvicorn 0.3.17

[alexbotello]

@tomchristie it seems the issue is with the caplog.set_level. I was able to get the tests working by passing the name of our logger, "uvicorn" to the function.

So uvicorn/tests/middleware/test_message_logger.py lines 16, 37, 55 should be:

caplog.set_level(logging.DEBUG, logger="uvicorn")