GoogleColaboratoryでfastapiを実行する

スポンサーリンク

GoogleColaboratoryでfastapiを実行してみます。

fastapiは、PythonでRESTful API を構築するためのWeb フレームワークである。

■今回の環境（Python）

今回のPythonは、バージョン3.9.16を用いる。（なお、Google Colaboratory(Google Colab)を使用。）

■fastapiを実行するための準備

では、GoogleColaboratoryでfastapiを実行してみますので、まずはそのための準備を行います。

■コード

  1. !pip install colabcode
  2. !pip install fastapi

今回は、Google Colabでcodeserverを実行できる「colabcode」と、fastapiをインストールします。※code-serverはブラウザからアクセスして利用できるVSCodeのサーバアプリケーション。

警告

実行中のコードは許可されていない可能性があるため、今後の Colab の利用を制限させていただく場合があります。よくある質問で指定されている禁止行為をご確認ください。

セルにコードを記述し、実行しようとすると、上記のメッセージが表示されます。今回は検証のため「続行」ボタンをクリックします。

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Collecting notebook<7 Downloading notebook-6.5.4-py3-none-any.whl (529 kB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 529.8/529.8 kB 29.8 MB/s eta 0:00:00 Downloading notebook-6.5.3-py3-none-any.whl (529 kB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 529.7/529.7 kB 31.9 MB/s eta 0:00:00 Downloading notebook-6.5.2-py3-none-any.whl (439 kB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 439.1/439.1 kB 24.5 MB/s eta 0:00:00 Downloading notebook-6.5.1-py3-none-any.whl (439 kB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 439.1/439.1 kB 32.4 MB/s eta 0:00:00 Downloading notebook-6.4.12-py3-none-any.whl (9.9 MB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 9.9/9.9 MB 17.2 MB/s eta 0:00:00 Downloading notebook-6.4.11-py3-none-any.whl (9.9 MB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 9.9/9.9 MB 58.6 MB/s eta 0:00:00 Downloading notebook-6.4.10-py3-none-any.whl (9.9 MB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 9.9/9.9 MB 39.1 MB/s eta 0:00:00 Downloading notebook-6.4.9-py3-none-any.whl (9.9 MB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 9.9/9.9 MB 56.1 MB/s eta 0:00:00 Downloading notebook-6.4.7-py3-none-any.whl (9.9 MB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 9.9/9.9 MB 50.2 MB/s eta 0:00:00 Downloading notebook-6.4.6-py3-none-any.whl (9.9 MB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 9.9/9.9 MB 46.9 MB/s eta 0:00:00 Downloading notebook-6.4.5-py3-none-any.whl (9.9 MB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 9.9/9.9 MB 63.6 MB/s eta 0:00:00 Requirement already satisfied: ptyprocess>=0.5 in /usr/local/lib/python3.10/dist-packages (from pexpect>4.3->ipython->jupyterlab==3.0.7->colabcode) (0.7.0)
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Requirement already satisfied: pycparser in /usr/local/lib/python3.10/dist-packages (from cffi>=1.0.1->argon2-cffi-bindings->argon2-cffi->jupyter-server~=1.2->jupyterlab==3.0.7->colabcode) (2.21)
Building wheels for collected packages: pyngrok
  Building wheel for pyngrok (setup.py) ... done
  Created wheel for pyngrok: filename=pyngrok-6.0.0-py3-none-any.whl size=19879 sha256=c249fd400a5bf49f8bb14c6cd3025b734432496d728212fcbfea45c8da8a0ffd
  Stored in directory: /root/.cache/pip/wheels/5c/42/78/0c3d438d7f5730451a25f7ac6cbf4391759d22a67576ed7c2c
Successfully built pyngrok
Installing collected packages: json5, requests, pyngrok, nest-asyncio, jsonschema, jedi, h11, click, uvicorn, notebook, notebook-shim, jupyterlab-server, nbclassic, jupyterlab, colabcode
  Attempting uninstall: requests
    Found existing installation: requests 2.27.1
    Uninstalling requests-2.27.1:
      Successfully uninstalled requests-2.27.1
  Attempting uninstall: nest-asyncio
    Found existing installation: nest-asyncio 1.5.6
    Uninstalling nest-asyncio-1.5.6:
      Successfully uninstalled nest-asyncio-1.5.6
  Attempting uninstall: jsonschema
    Found existing installation: jsonschema 4.3.3
    Uninstalling jsonschema-4.3.3:
      Successfully uninstalled jsonschema-4.3.3
  Attempting uninstall: click
    Found existing installation: click 8.1.3
    Uninstalling click-8.1.3:
      Successfully uninstalled click-8.1.3
  Attempting uninstall: notebook
    Found existing installation: notebook 6.4.8
    Uninstalling notebook-6.4.8:
      Successfully uninstalled notebook-6.4.8
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
google-colab 1.0.0 requires notebook==6.4.8, but you have notebook 6.4.5 which is incompatible.
flask 2.2.4 requires click>=8.0, but you have click 7.1.2 which is incompatible.
Successfully installed click-7.1.2 colabcode-0.3.0 h11-0.14.0 jedi-0.18.2 json5-0.9.11 jsonschema-4.17.3 jupyterlab-3.0.7 jupyterlab-server-2.22.1 nbclassic-0.3.7 nest-asyncio-1.4.3 notebook-6.4.5 notebook-shim-0.2.3 pyngrok-6.0.0 requests-2.30.0 uvicorn-0.13.1
Looking in indexes: https://pypi.org/simple, https://us-python.pkg.dev/colab-wheels/public/simple/
Collecting fastapi
  Downloading fastapi-0.95.1-py3-none-any.whl (56 kB)
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Collecting starlette<0.27.0,>=0.26.1
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Requirement already satisfied: pydantic!=1.7,!=1.7.1,!=1.7.2,!=1.7.3,!=1.8,!=1.8.1,<2.0.0,>=1.6.2 in /usr/local/lib/python3.10/dist-packages (from fastapi) (1.10.7)
Requirement already satisfied: typing-extensions>=4.2.0 in /usr/local/lib/python3.10/dist-packages (from pydantic!=1.7,!=1.7.1,!=1.7.2,!=1.7.3,!=1.8,!=1.8.1,<2.0.0,>=1.6.2->fastapi) (4.5.0)
Requirement already satisfied: anyio<5,>=3.4.0 in /usr/local/lib/python3.10/dist-packages (from starlette<0.27.0,>=0.26.1->fastapi) (3.6.2)
Requirement already satisfied: idna>=2.8 in /usr/local/lib/python3.10/dist-packages (from anyio<5,>=3.4.0->starlette<0.27.0,>=0.26.1->fastapi) (3.4)
Requirement already satisfied: sniffio>=1.1 in /usr/local/lib/python3.10/dist-packages (from anyio<5,>=3.4.0->starlette<0.27.0,>=0.26.1->fastapi) (1.3.0)
Installing collected packages: starlette, fastapi
Successfully installed fastapi-0.95.1 starlette-0.26.1

クリックすると、「ERROR: pip’s dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.」というエラーが出力されたが、一旦無視します。クリック後、インストールが完了となります。

■コード

  1. from colabcode import ColabCode
  2. from fastapi import FastAPI
  4. cc = ColabCode(port=12000, code=False)
  6. app = FastAPI()
  8. @app.get(“/”)
  9. async def read_root():
  10.   return {“message”: “Subscribe to @1littlecoder”}
  12. cc.run_app(app=app)

完了後、ColabCode()を用いる。括弧内には引数,パラメータとして、code-serverを実行するポートを「port=12000」に指定、さらに「code=False」に指定し、code-serverを用いてfastapiを実行する。

セルに今回のコードを記述し実行してみます。

WARNING:pyngrok.process.ngrok:t=2023-05-07T04:13:18+0000 lvl=warn msg="ngrok config file found at legacy location, move to XDG location" xdg_path=/root/.config/ngrok/ngrok.yml legacy_path=/root/.ngrok2/ngrok.yml
INFO:     Started server process [382]
INFO:uvicorn.error:Started server process [382]
INFO:     Waiting for application startup.
INFO:uvicorn.error:Waiting for application startup.
INFO:     Application startup complete.
INFO:uvicorn.error:Application startup complete.
INFO:     Uvicorn running on http://127.0.0.1:12000 (Press CTRL+C to quit)
INFO:uvicorn.error:Uvicorn running on http://127.0.0.1:12000 (Press CTRL+C to quit)
Public URL: NgrokTunnel: "https://＊＊＊＊＊＊.ngrok.io" -> "http://localhost:12000"

実行すると、上記のメッセージが出力されます。メッセージ内の「Public URL: NgrokTunnel: “https://＊＊＊＊＊＊.ngrok.io”」で記載されたNgrokTunnelのURLをクリックします。

クリックすると、JSONレスポンスが表示されることを確認できました。

今回GoogleColaboratoryでfastapiを実行してわかったことは、colabcodeというライブラリを使うと、「実行中のコードは許可されていない可能性があるため、今後の Colab の利用を制限」される場合があるので、著者は推奨しない。

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