Django Datawatch

With Django Datawatch you are able to implement arbitrary checks on data, review their status and even describe what to do to resolve them. Think of nagios/icinga for data.

Requirements

Currently celery is required to run the checks. We'll be supporting different backends in the future.

Install

$ pip install django-datawatch

Add django_datawatch to your INSTALLED_APPS

Write a custom check

Create checks.py inside your module.

from datetime import datetime

from dateutil.relativedelta import relativedelta

from django_datawatch.datawatch import datawatch
from django_datawatch.base import BaseCheck, CheckResponse
from django_datawatch.models import Result


@datawatch.register
class CheckTime(BaseCheck):
    run_every = relativedelta(minute=5)  # scheduler will execute this check every 5 minutes

    def generate(self):
        yield datetime.datetime.now()

    def check(self, payload):
        response = CheckResponse()
        if payload.hour <= 7:
            response.set_status(Result.STATUS.ok)
        elif payload.hour <= 12:
            response.set_status(Result.STATUS.warning)
        else:
            response.set_status(Result.STATUS.critical)
        return response

    def get_identifier(self, payload):
        # payload will be our datetime object that we are getting from generate method
        return payload

    def get_payload(self, identifier):
        # as get_identifier returns the object we don't need to process it
        # we can return identifier directly
        return identifier

generate

Must yield payloads to be checked. The check method will then be called for every payload.

check

Must return an instance of CheckResponse.

get_identifier

Must return a unique identifier for the payload.

Run your checks

A management command is provided to queue the execution of all checks based on their schedule. Add a crontab to run this command every minute and it will check if there's something to do.

$ ./manage.py datawatch_run_checks
$ ./manage.py datawatch_run_checks --slug=example.checks.UserHasEnoughBalance

Refresh your check results

A management command is provided to forcefully refresh all existing results for a check. This comes in handy if you changes the logic of your check and don't want to wait until the periodic execution or an update trigger.

$ ./manage.py datawatch_refresh_results
$ ./manage.py datawatch_refresh_results --slug=example.checks.UserHasEnoughBalance

Get a list of registered checks

$ ./manage.py datawatch_list_checks

Clean up your database

Remove the unnecessary check results if you've removed the code for a check.

$ ./manage.py datawatch_delete_ghost_results

Settings

DJANGO_DATAWATCH_BACKEND = 'django_datawatch.backends.synchronous'
DJANGO_DATAWATCH_CELERY_QUEUE_NAME = 'django_datawatch'
DJANGO_DATAWATCH_RUN_SIGNALS = True

DJANGO_DATAWATCH_BACKEND

You can chose the backend to run the tasks. Supported are 'django_datawatch.backends.synchronous' and 'django_datawatch.backends.celery'.

Default: 'django_datawatch.backends.synchronous'

DJANGO_DATAWATCH_CELERY_QUEUE_NAME

You can customize the celery queue name for async tasks (applies only if celery backend chosen).

Default: 'django_datawatch'

DJANGO_DATAWATCH_RUN_SIGNALS

Use this setting to disable running post_save updates during unittests if required.

Default: True

CONTRIBUTE

We've included an example app to show how django_datawatch works. Start by launching the included vagrant machine.

vagrant up
vagrant ssh

Then setup the example app environment.

./manage.py migrate
./manage.py loaddata example

The installed superuser is "example" with password "datawatch".

Run the development webserver.

./manage.py runserver 0.0.0.0:8000

Login on the admin interface and open http://ddw.dev:8000/ afterwards. You'll be prompted with an empty dashboard. That's because we didn't run any checks yet. Let's enqueue an update.

./manage.py datawatch_run_checks --force

The checks for the example app are run synchronously and should be updated immediately. If you decide to switch to the celery backend, you should now start a celery worker to process the checks.

celery worker -A example -l DEBUG -Q django_datawatch

You will see some failed check now after you refreshed the dashboard view.