How to add timestamp to each request in uvicorn logs?

Question

When I run my FastAPI server using uvicorn:

uvicorn main:app --host 0.0.0.0 --port 8000 --log-level info

The log I get after running the server:

INFO:     Started server process [405098]
INFO:     Waiting for application startup.
INFO:     Connect to database...
INFO:     Successfully connected to the database!
INFO:     Application startup complete.
INFO:     Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
INFO:     122.179.31.158:54604 - "GET /api/hello_world?num1=5&num2=10 HTTP/1.1" 200 OK

How do I get the time stamp along with the request logging? Like:

INFO:     "2020-07-16:23:34:78" - 122.179.31.158:54604 - "GET /api/hello_world?num1=5&num2=10 HTTP/1.1" 200 OK

Answer 1

You can create a dict logger config and initialize the same using dictConfig function in your main application.

#main.py



from fastapi import FastAPI



app = FastAPI()


@app.get("/")
async def root():
    return {"message": "Hello World"}

#config/log_config.py

sample_logger = {
    "version": 1,
    "disable_existing_loggers": False,
    "formatters": {
        "access": {
            "()": "uvicorn.logging.AccessFormatter",
            
            "use_colors": True
        },
    },
    "handlers": {
        "access": {
            "formatter": "access",
            "class": "logging.StreamHandler",
            "stream": "ext://sys.stdout",
        },
    },
    "loggers": {
        "uvicorn.access": {
            "handlers": ["access"],
            "level": "INFO",
            "propagate": False
        },
    },
}

Answer 2

You can use Uvicorn's LOGGING_CONFIG

import uvicorn
from uvicorn.config import LOGGING_CONFIG
from fastapi import FastAPI

app = FastAPI()

def run():
    LOGGING_CONFIG["formatters"]["default"]["fmt"] = "%(asctime)s [%(name)s] %(levelprefix)s %(message)s"
    uvicorn.run(app)

if __name__ == '__main__':
    run()

Which will return uvicorn log with the timestamp

2020-08-20 02:33:53,765 [uvicorn.error] INFO:     Started server process [107131]
2020-08-20 02:33:53,765 [uvicorn.error] INFO:     Waiting for application startup.
2020-08-20 02:33:53,765 [uvicorn.error] INFO:     Application startup complete.
2020-08-20 02:33:53,767 [uvicorn.error] INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)

Answer 3

Was able to achieve the same by not running the server from terminal using uvicorn command. But by running the server using run function of uvicorn package.

While surfing the web for the solution, I ended up on this issue , where Dylan Anthony has written the solution using run function of uvicorn package.

Although, it will still be good to know how to achieve the same using uvicorn command.

Answer 4

Combined the answers of @Yagiz Degirmenci and @HappyFace, I got this code.

LOGGING_CONFIG["formatters"]["default"]["fmt"] = "%(asctime)s [%(name)s] %(levelprefix)s %(message)s"
LOGGING_CONFIG["formatters"]["access"][
    "fmt"] = '%(asctime)s [%(name)s] %(levelprefix)s %(client_addr)s - "%(request_line)s" %(status_code)s'

The log likes this:

2021-03-31 18:38:22,728 [uvicorn.error] INFO:     Started server process [21824]
2021-03-31 18:38:22,729 [uvicorn.error] INFO:     Waiting for application startup.
2021-03-31 18:38:22,729 [uvicorn.error] INFO:     Application startup complete.
2021-03-31 18:38:22,729 [uvicorn.error] INFO:     Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
2021-03-31 18:38:26,359 [uvicorn.access] INFO:     127.0.0.1:51932 - "POST /limit HTTP/1.1" 200 OK