email.py

from threading import Thread
from flask import current_app, render_template
from flask_mail import Message
from . import mail


def send_async_email(app, msg):
    with app.app_context():
        mail.send(msg)


def send_email(to, subject, template, **kwargs):
    subject = '{} {}'.format(current_app.config['OPAQUE_MAIL_SUBJECT_PREFIX'],
                             subject)
    msg = Message(subject,
                  sender=current_app.config['OPAQUE_MAIL_SENDER'],
                  recipients=[to])
    msg.body = render_template(template + '.txt.j2', **kwargs)
    msg.html = render_template(template + '.html.j2', **kwargs)
    thr = Thread(target=send_async_email,
                 args=[current_app._get_current_object(), msg])
    thr.start()
    return thr