Creating a Notifier¶
The BaseNotifier
is an abstract class that provides a basic
structure for sending notifications in Airflow using the various on_*__callback
.
It is intended for providers to extend and customize for their specific needs.
To extend the BaseNotifier class, you will need to create a new class that inherits from it. In this new class,
you should override the notify
method with your own implementation that sends the notification. The notify
method takes in a single parameter, the Airflow context, which contains information about the current task and execution.
You can also set the template_fields
attribute to specify which attributes should be rendered as templates.
Here’s an example of how you can create a Notifier class:
from airflow.sdk import BaseNotifier
from my_provider import async_send_message, send_message
class MyNotifier(BaseNotifier):
template_fields = ("message",)
def __init__(self, message: str):
self.message = message
def notify(self, context: Context) -> None:
# Send notification here. For example:
title = f"Task {context['task_instance'].task_id} failed"
send_message(title, self.message)
async def async_notify(self, context: Context) -> None:
# Only required if your Notifier is going to support asynchronous code. For example:
title = f"Task {context['task_instance'].task_id} failed"
await async_send_message(title, self.message)
For a list of community-managed notifiers, see Notifications.
Using Notifiers¶
For using Notifiers in event-based Dag callbacks, see Callbacks.