Send mail with some delay time in odoo11 - email

Question

I have to send a mail when stage changes with a delay of some specific time. For example, in my case, I have to send mail after 10 minutes of stage changes. The time should be configurable.
I have try to achieve this by making force parameter to false as below:-
self.env['mail.template'].browse(template.id).send_mail(self.id, force_send=False)
And after that i have changed time intervals of "Mail: Email Queue Manager" template in scheduled action as per my requirement. In this case arises that When i send 2 mails lets say first mail on 11:30 and second mail on 11:33 and scheduled action will be performed on 11:35. So it sends both mails on 11:35 instead of sending mails on 11:35 and 11:38 respectively if i scheduled it at every 5 minutes after stage changes.
So how can i achieve this?

Answer 1

You may pass the send mail function to a new thread with execution time 5 minutes
Imagine that the Odoo project is running in a main thread and you are gonna send the mail in a second thread
import threading
import time
def odoo_project():
for x in range(0,11):
print(x)
time.sleep(1)
def mail_sender():
for x in range(100,103):
print(x)
time.sleep(5)
t1 = threading.Thread(target=odoo_project)
t2 = threading.Thread(target=mail_sender)
t1.start()
t2.start()
This will output
0
100
1
2
3
4
101
5
6
7
8
9
102
10
which means the Odoo project will continue working while the mail thread is gonna send the mail after 5 minutes -replace 5 with 5 * 60 in the example-
Also it would be a better design if you did a config field that you type the delay value in it instead of hard-coding the 5 minutes in the code in case you wanted future updates