I dont have any knowledge about the cron. In my project once the task is assigned to employee email is sent to his mailid. If the employee does not complete the task within deadline I want to send the mail after every 3 days to complete the task. Can anyone give me I idea what I should do. The project is on my local environment, does it support or I should take server.
apscheduler would do the job
It would look like this
bg_scheduler = BackgroundScheduler()
bg_scheduler.add_job(send_email, 'interval', days=3)
bg_scheduler.start()
Related
So I have notification system in place.For example when sending a task to user, user get a notification within my system. Right now I have only "instant" notifications. so when I send a task to someone, a notification is created in the db, and via web-socket the user is notified with the data of the notification.
With the Reminder I have the problem, that the notification I want to send here is not necessarily "instant". I want to set the date to next Monday on 9 am. so User should receive the notification on Monday 9 am.
Question: Is there an extension in django (or onboard methods) where I can execute stuff delayed? For example, send notification with the following data on Monday 9 am.
Celery can be used to schedule and defer tasks.
Here's and example of how to schedule for a specific time. https://docs.celeryq.dev/en/latest/userguide/calling.html#eta-and-countdown
I am building a Django app that uses APScheduler to send out a daily email at a scheduled time each day. Recently the decision was made to bump up the number of instances to two in order to always have something running in case one of the instances crashes. The problem I am now facing is how to prevent the daily email from being sent out by both instances. I've considered having it set some sort of flag on the database (Postgres) so the other instance knows not to send, but I think this method would create race conditions--the first instance wouldn't set the flag in time for the second instance to see or some similar scenario. Has anybody come up against this problem and how did you resolve it?
EDIT:
def start():
scheduler = BackgroundScheduler()
scheduler.add_job(send_daily_emails, 'cron', hour=11)
scheduler.start()
So this is run when my app initializes--this creates a background scheduler that runs the send_daily_emails function at 11am each morning. The send_daily_emails function is exactly that--all it does is send a couple of emails. My problem is that if there are two instances of the app running, two separate background schedulers will be created and thus the emails will be sent twice each day instead of once.
You can use your proposed database solution with select_for_update
If you're using celery, why not use celery-beat + django-celery-beat?
You can use something like the following. Note the max_instances param.
def start():
scheduler = BackgroundScheduler()
scheduler.add_job(send_daily_emails, trigger='cron', hour='23', max_instances=1)
scheduler.start()
my app has list of events with start time (date and time). I want to make a scheduled task to send reminder via email to all user participate in event 1 hour before event start. (Note: Admin can change time of event).
I currently use celery to send email to list of participants when admin change the time of event.
Please suggest me some solution for this. Thanks.
Here's a recent(ish) discussion where a potential solution is proposed for celery: https://github.com/celery/celery/issues/4522.
I built Posthook to make solving these kinds of problems easier for developers. In your case, when a new event is created or the event time changes you can schedule a request back to your app for 1 hour before the start time. Then when you get the request from Posthook you can send out the reminder after validating that it still needs to be sent out.
I have a Ruby on Rails 4.0 and PostgreSQL app hosted in an Ubuntu VPS. in this application I want to send email based on data in the database. for example a background job check a table content per hour and depend on content send email to user or not. I decided to do this work by Resque.
how can I do that?
should I do in Rails app or in an independent service?
and how can I schedule this job?
There are couple of more options I advise you to try to
1. Cron : One of most preferred approach for any unix developer to run a task based upon some interval . here are read more about
FYI: if you facing problem with understanding cron settings there are gem available to do the same for you its called whenever
2. Resque-Scheduler : Surely you missed one of Resque plugins that provide exactly the same feature that you need its called resque-scheduler . It too provide cron like settings for you to work on
Please check the above link for more info
Hope this helps.
I do not use Resque because I want a process in the Ubuntu server that in a schedule time (per hour). for example per hour check the table content and send alarm to the users by email.
I make a process by Daemon and rufus-scheduler for scheduling.
Process.daemon(true)
task_test = TaskTest.new
pid = Process.fork do
task_test.task
end
class TaskTest
def task
scheduler = Rufus::Scheduler.new
scheduler.every '1h' do
msg = "Message"
mailer = MailerProcess.new
mailer.send_mail('email-address', 'password', 'to-email', 'Subject', msg)
puts Time.now
end
scheduler.join
end
end
I want incorporate a timed based reminder email of the events for the day in django. Basically I have a model which has all the events (including the date of the event). I want to send emails to concerned people at around 8.00 AM in the morning of each day about the events for the day. How do I incorporate this is django?
Thanks
I reckon a custom management command to send the alerts, commanded by django-chronograph should do the trick
I wrote a database-backed email queue, to send out emails from a single django install and not have to worry about SMTP throttling and whatnot. It's dead simple -- one model class for the email with a sendit() method, and a command-line script to flush the queue, which I run with cron.
http://gist.github.com/629663