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Run Gunicorn with Uvicorn workers in code
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""" Snippet that demonstrates how to use Gunicorn with Uvicorn workers in code. | |
Feel free to run: | |
- `python main.py` - to use uvicorn. | |
- `ENV=prod python main.py` - to use gunicorn with uvicorn workers. | |
Reference: https://docs.gunicorn.org/en/stable/custom.html | |
""" | |
import multiprocessing | |
import os | |
from typing import Any, Callable, Dict | |
import uvicorn | |
from fastapi import FastAPI | |
from gunicorn.app.base import BaseApplication | |
app = FastAPI() | |
@app.get("/") | |
async def home(): | |
return "Hello World!" | |
def number_of_workers(): | |
return (multiprocessing.cpu_count() * 2) + 1 | |
class StandaloneApplication(BaseApplication): | |
def __init__(self, application: Callable, options: Dict[str, Any] = None): | |
self.options = options or {} | |
self.application = application | |
super().__init__() | |
def load_config(self): | |
config = { | |
key: value | |
for key, value in self.options.items() | |
if key in self.cfg.settings and value is not None | |
} | |
for key, value in config.items(): | |
self.cfg.set(key.lower(), value) | |
def load(self): | |
return self.application | |
if __name__ == "__main__": | |
if os.getenv("ENV") == "prod": | |
options = { | |
"bind": "%s:%s" % ("127.0.0.1", "8000"), | |
"workers": number_of_workers(), | |
"worker_class": "uvicorn.workers.UvicornWorker", | |
} | |
StandaloneApplication(app, options).run() | |
else: | |
uvicorn.run("main:app", reload=True) |
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gunicorn==20.1.0 | |
uvicorn==0.14.0 | |
fastapi==0.66.0 |
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