Sending async email with Flask-Security - asynchronous

Question

I'm attempting to configure Flask-Security to send email asynchronously.
I have some code which send async email via Flask-Mail, but I'm having trouble integrating it with my application factory function so that it works in conjunction with Flask-Security.
Application factory:
mail = Mail()
db = SQLAlchemy()
security = Security()
from app.models import User, Role
user_datastore = SQLAlchemyUserDatastore(db, User, Role)
def create_app(config_name):
# Config
app = Flask(__name__)
app.config.from_object(config[config_name])
config[config_name].init_app(app)
# Initialize extensions
mail.init_app(app)
db.init_app(app)
security.init_app(app, user_datastore)
return app
In the Flask-Security documentation it says to use #security.send_mail_task to override the way the extension sends emails.
So where exactly do I implement this decorator? Seems like anywhere I put it inside the application factory, I get circular imports.
These are the async email functions I am trying to use, taken from this issue:
#async
def send_security_email(msg):
with app.app_context():
mail.send(msg)
#security.send_mail_task
def async_security_email(msg):
send_security_email(msg)
Where does this code need to be put in order to work with the app factory?
Thanks in advance.

Answer 1

I was able to achieve this like so:
mail = Mail()
db = SQLAlchemy()
security = Security()
from app.models import User, Role
user_datastore = SQLAlchemyUserDatastore(db, User, Role)
def create_app(config_name):
# Config
app = Flask(__name__)
app.config.from_object(config[config_name])
config[config_name].init_app(app)
# Initialize extensions
mail.init_app(app)
db.init_app(app)
security_ctx = security.init_app(app, user_datastore)
# Send Flask-Security emails asynchronously
#security_ctx.send_mail_task
def async_security_email(msg):
send_security_email(app, mail, msg)
return app