__init__.py

from config import config
from flask import Flask
from flask_login import LoginManager
from flask_mail import Mail
from flask_paranoid import Paranoid
from flask_socketio import SocketIO
from flask_sqlalchemy import SQLAlchemy


db = SQLAlchemy()
login_manager = LoginManager()
login_manager.login_view = 'auth.login'
mail = Mail()
paranoid = Paranoid()
paranoid.redirect_view = '/'
socketio = SocketIO()


def create_app(config_name):
    app = Flask(__name__)
    app.config.from_object(config[config_name])

    config[config_name].init_app(app)
    db.init_app(app)
    login_manager.init_app(app)
    mail.init_app(app)
    paranoid.init_app(app)
    socketio.init_app(
        app, message_queue=app.config['NOPAQUE_SOCKETIO_MESSAGE_QUEUE_URI'])

    with app.app_context():
        from . import events
        from .admin import admin as admin_blueprint
        from .auth import auth as auth_blueprint
        from .corpora import corpora as corpora_blueprint
        from .errors import errors as errors_blueprint
        from .jobs import jobs as jobs_blueprint
        from .main import main as main_blueprint
        from .services import services as services_blueprint
        from .settings import settings as settings_blueprint

    app.register_blueprint(admin_blueprint, url_prefix='/admin')
    app.register_blueprint(auth_blueprint, url_prefix='/auth')
    app.register_blueprint(corpora_blueprint, url_prefix='/corpora')
    app.register_blueprint(errors_blueprint)
    app.register_blueprint(jobs_blueprint, url_prefix='/jobs')
    app.register_blueprint(main_blueprint)
    app.register_blueprint(services_blueprint, url_prefix='/services')
    app.register_blueprint(settings_blueprint, url_prefix='/settings')

    return app