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FastAPI development with Jupyter notebook

Last updated at Posted at 2022-03-01

とある仕事で、Fastapiを書くことになった。
ただし、他のメンバーがWEBサーバーの素人
もちろん、PythonはJupyterで書くことしか知らない

JupyterでFASTAPIを動かす

以下はToken付きでFileアップロードするコード

fast_api_snipet.py

from fastapi import FastAPI, HTTPException
from fastapi import FastAPI, File, Form, UploadFile
from peewee import SqliteDatabase, Model, AutoField, CharField, TextField

SECRET_KEY = "4qbqcd_iqxk-y6(gr8l^9elsr1acj+t7zohf7v8reqp&^e7%6p"

db = SqliteDatabase('db.sqlite3')

class User(Model):
    id: int = AutoField(primary_key=True)
    name: str = CharField(100)
    password: str = CharField(100)
    refresh_token: str = TextField(null=True)

    class Meta:
        database = db

db.create_tables([User])
User.create(name='tester', password='tester')

app = FastAPI()

def check_valid_token(token: str) -> bool:
    return len(User.select().where(User.refresh_token == token)) != 0

@app.post("/uploadfile/")
async def upload_file(
    file: bytes = File(...), fileb: UploadFile = File(...), token: str = Form(...)
):
    if not check_valid_token(token):
        raise HTTPException(status_code=401, detail='Invalid token')

    return {
        "file_size": len(file),
        "token": token,
        "fileb_content_type": fileb.content_type,
        }

通常

shell.sh
uvicorn fast_api_snipet:app --host 0.0.0.0 --reload

Jupyterの場合

 このまま動かしても、反応がない・・・

解決方法

 以下のコードを実行。
 もちろんプロセスは停止しないので(*)のままです・・・

test.py
import nest_asyncio
import uvicorn

if __name__ == "__main__":
    nest_asyncio.apply()
    uvicorn.run(app, port=5001)

INFO: Started server process [14812]
INFO: Waiting for application startup.
INFO: Application startup complete.
INFO: Uvicorn running on http://127.0.0.1:5001 (Press CTRL+C to quit)
INFO: 127.0.0.1:51238 - "GET / HTTP/1.1" 404 Not Found
INFO: 127.0.0.1:51238 - "GET /favicon.ico HTTP/1.1" 404 Not Found
INFO: 127.0.0.1:51240 - "GET /docs/ HTTP/1.1" 307 Temporary Redirect
INFO: 127.0.0.1:51240 - "GET /docs HTTP/1.1" 200 OK
INFO: 127.0.0.1:51240 - "GET /openapi.json HTTP/1.1" 200 OK

APIサーバー

ちゃんと裏ではサーバーが動いています。

image.png

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