Django Signal Notification

a django app to send any notifications(sms, email, rocketchat and any media) after triggered a signal. you can add new "media" and new "handler". also you can customize your template messages directly in python handler class or in a django template file.

Setup

Requirements

• Python >= 3.4
• Django >= 2.0

Installation

1. Install django-signal-notifier by pip:

   $ pip install django-signal-notification
   

2. Add "signal_notification" at the end of INSTALLED_APPS setting like this

   INSTALLED_APPS = [
       'django.contrib.auth',
       'django.contrib.contenttypes',
       ...
       'signal_notification',
   ]
   

3. python manage.py migrate
4. goto admin panel to add new NotificationSetting records.

Settings

# Disable signal notification completely if set as True
SIGNAL_NOTIFICATION_DISABLED = False 

# Add your custom media classes path here.
SIGNAL_NOTIFICATION_MEDIA_CLASSES = [
    'signal_notification.notify_media.EmailMedia',
    'signal_notification.notify_media.SMSMedia',
]

# set your custom NotifyManager class path here
SIGNAL_NOTIFICATION_MANAGER_CLASS = 'signal_notification.notify_manager.NotifyManager'

# Add your handlers class path here.
SIGNAL_NOTIFICATION_HANDLER_CLASSES = [
    'signal_notification.notify_handlers.UserLoggedInHandler',
    'signal_notification.notify_handlers.UserLoginFailedHandler',
    'signal_notification.notify_handlers.NewUserHandler',
]

Add new Media class

• You should add a new class inherited from "signal_notification.notify_media.NotifyMedia".
• set unique "name" field of that class
• override and implement the "send" method
• set PARAMS_SCHEMA_VALIDATOR field for that class

from signal_notification.notify_media import NotifyMedia
class NewMedia(NotifyMedia):
    name = 'new_media'
    PARAMS_SCHEMA_VALIDATOR = {
        'to': {'type': 'string', 'nullable': False, 'required': True, 'empty': False}
    }
    def send(self, message, subject=None):
        to = self.kwargs['to']
        # ...

• append path of this class to "SIGNAL_NOTIFICATION_MEDIA_CLASSES" setting

SIGNAL_NOTIFICATION_MEDIA_CLASSES = [
    ...
    'foo.bar.NewMedia'
]

Add new Handler class

• You should add a new class inherited from "signal_notification.notify_handlers.NotifyHandler".
• set unique "name" field of that class
• set subject and message templates(directly in class or as a django templates file)

from django.contrib.auth import user_logged_out
from signal_notification.notify_handlers import NotifyHandler
class StaffUserLoggedOut(NotifyHandler):
    '''Send a notification when an Staff user logged out'''
    name = 'staff_user_logged_out'
    signal = user_logged_out
    subject_template = 'User Exited'
    message_template = 'Staff User "{{user}}" Logged out.'

    def is_triggered(self, notification_args):
        '''Using this method to ignore notification by checking some conditions'''
        user = notification_args.get('user')
        if not user.is_staff:
            return False
        return super().is_triggered(notification_args)

• append path of this class to "SIGNAL_NOTIFICATION_HANDLER_CLASSES" setting

SIGNAL_NOTIFICATION_HANDLER_CLASSES = [
    ...
    'foo.bar.StaffUserLoggedOut'
]

How to customize the message template of handler?

You have 2 options:

1. define subject and message directly in Handler class by setting this fields of class:
   • subject_template
   • message_template
2. define subject and message in templates path as a django template file.
   • add a subject file in this templates path:
     • signal_notification/<handler_name>/subject-<media_name>.html # this is for specific media
     • signal_notification/<handler_name>/subject.html # this is for all media
   • add a message file in this templates path:
     • signal_notification/<handler_name>/message-<media_name>.html # this is for specific media
     • signal_notification/<handler_name>/message.html # this is for all media

Notice: the priorities for templates are:

1. media template: signal_notification/<handler_name>/message-<media_name>.html
2. general template: signal_notification/<handler_name>/message.html
3. class template fields: message_template

Signals

• You can use predefined django signals(like, post_save, pre_save, ..)
• You can add your signals and use that in Handler

# in foo/bar/signals.py
from django.dispatch import Signal
test_signal = Signal()

add Custom NotifyManager

some times you want to have your custom manger. for example you want notifications be handled in a background task using celery, apscheduler, huey.

1. You need to add a new class inherited from signal_notification.notify_manager.NotifyManager
2. override the "handle_notification" class method.(use "_handle_notification" in your method as a final endpoint of handler method)

import traceback
from signal_notification.notify_manager import NotifyManager

class APSchedulerNotifyManager(NotifyManager):

    @classmethod
    def handle_notification(cls, handler_cls, notification_args):
        apscheduler_client = '<apscheduler_client object>'  
        try:
            apscheduler_client.root.add_job(
                'foo.bar:APSchedulerNotifyManager._handle_notification', 'date',
                args=(handler_cls, notification_args)
            )
        except Exception:
            traceback.print_exc()

1. set path of this class for SIGNAL_NOTIFICATION_MANAGER_CLASS setting

SIGNAL_NOTIFICATION_MANAGER_CLASS = 'foo.bar.APSchedulerNotifyManager'

Demo

1. cd django_signal_notification/demo
2. python manage.py migrate
3. python manage.py createsuperuser
4. python manage.py runserver
5. goto http://127.0.0.1:8000/admin
6. navigate to /admin/signal_notification/notificationsetting/ and add your NotificationSettings records