Loochs

How to deploy for Python Flask application with API / View separation / APIとViewを切り分けたPython Flaskアプリのデプロイ方法

参考記事

https://loochs.org/how-to-deploy-for-minimum-flask-application-on-apache-apache/

初めに

以下のような構成でアプリをデプロイしたいとする

APIの実装

$ cd /home/ubuntu/hoge/test
$ vim api/body.py
# api/body.py

from flask import Flask, Blueprint

api = Blueprint('api', __name__) # apiをモジュールとして定義

@api.route('/')
def index():
    return 'This is api'

上記のapiをモジュールとして読み込むためにアプリロジックを以下のようにする。

$ vim __init__.py
# __init__.py

import sys
sys.path.insert(0, '/home/ubuntu/hoge/test')

from flask import Flask
app = Flask(__name__)

from api.body import api
app.regster_blueprint(api, url_prefix='/api')

@app.route('/')
def index():
    return 'This is app route'

if __name__ = '__main__':
    app.run(host='0.0.0.0')

Apacheの設定変更

任意のurl、例えばhttp://sample.com/hoge/api でレスポンスが得られるようにしたい

$ cd /etc/apache2/sites-available/
$ sudo vim 000-default.conf
# 000-default.conf
LoadModule wsgi_module "/home/ubuntu/hoge/venv/lib/python3.8/site-packages/mod_wsgi/server/mod_wsgi-py38.cpython-38-x86_64-linux-gnu.so" # 補足①を参照
WSGIPythonHome "/home/ubuntu/hoge/venv"
WSGIScriptAlias /hoge /home/ubuntu/hoge/flaskapp.wsgi
<VirtualHost *:80>
        # The ServerName directive sets the request scheme, hostname and port that
        # the server uses to identify itself. This is used when creating
        # redirection URLs. In the context of virtual hosts, the ServerName
        # specifies what hostname must appear in the request's Host: header to
        # match this virtual host. For the default virtual host (this file) this
        # value is not decisive as it is used as a last resort host regardless.
        # However, you must set it for any further virtual host explicitly.
        #ServerName www.example.com

        ServerAdmin webmaster@localhost
        ServerName sample.com
        DocumentRoot /var/www/html

        <Directory /home/ubuntu/hoge > # アクセス許可のためのディレクティブ設定
                Require all granted
        </Directory>

        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
        # error, crit, alert, emerg.
        # It is also possible to configure the loglevel for particular
        # modules, e.g.
        #LogLevel info ssl:warn

        ErrorLog ${​​​​​APACHE_LOG_DIR}​​​​​​​​​​​​/error.log
        CustomLog ${​​​​​​​​​​​​​​​​​​​APACHE_LOG_DIR}​​​​​​​​​​​​​​​​​​​​​​​​​​/access.log combined

        # For most configuration files from conf-available/, which are
        # enabled or disabled at a global level, it is possible to
        # include a line for only one particular virtual host. For example the
        # following line enables the CGI configuration for this host only
        # after it has been globally disabled with "a2disconf".
        #Include conf-available/serve-cgi-bin.conf
</VirtualHost>

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