Flask Framework Cookbook - Second Edition

How to do it...

Doing an asynchronous execution with the threading package is very simple. Just add the following code to my_app/catalog/views.py:

from threading import Thread 
 
def send_mail(message): 
    with app.app_context(): 
        mail.send(message) 
 
# Replace the line below in create_category() 
# mail.send(message) 
# by 
t = Thread(target=send_mail, args=(message,))t.start()

As you can see, the sending of an email happens in a new thread, which sends the message as a parameter to the newly created method. We need to create a new send_mail() method because our email templates contain url_for, which can only be executed inside an application context; this won't be available in the newly created thread by default. It provides the flexibility of starting ...