Django Ping

Django Ping is utility that provides a lightweight endpoint for availability and uptime monitoring services. It also provides hooks for testing stack components and reporting them via JSON.

Current Version: 0.3.0 https://github.com/gpennington/django-ping

Installation

Use pip to download and install:

pip install django-ping

Add Django Ping to url conf:

url(r'^ping/', include('ping.urls')),

Basic Configuration

Hitting the endpoint returns a simple status 200 response. You can customize the message by adding to your Django settings:

PING_DEFAULT_RESPONSE = "All systems go!"
PING_DEFAULT_MIMETYPE = 'text/html'

Hitting the url:

/ping

displays:

All systems go!

Advanced Configuration

Enable Status Checks

Adding a checks=true parameter to the url tells Django Ping to run a series of status checks and reports the results.

For example:

/ping?checks=true

displays:

Your site is up!
db_sessions True
db_site True

By default, Django Ping tests that your Database is responding by using supplying two tests. You can supply your own tests to make sure everything is responding as expected. If you don't use database sessions or the contrib.sites app, you can removed remove the ones you don't need.

To customize, include a tuple in your Django settings:

PING_CHECKS = (
    'ping.checks.check_database_sessions',
    #'ping.checks.check_database_sites',
    'my_app.module.check_function',
    'my_other_app.some_module.some_function'
)

Specifying a fmt parameter to json returns more detailed and serialized data. For example:

/ping?fmt=json

displays:

{
    "db_sessions": true,
    "db_site": true
}

Custom Status Checks

Checks should accept the request object and return two values. The name/key to be displayed and the value of the check. The value should be anything that can be serialized.:

def check_sample(request):
    #...do some things...
    return 'foo', True
    #or
    return 'bar', float(123.456)
    #or even
    return 'baz', ['one', 'two', 'three', {'a':1, 'b':2, 'c':3}]

Then, add that to the PING_CHECKS tuple to display:

{
    'foo', true
}

You can send POST requests too. As an example:

def check_create_user(request):
    from django.contrib.auth.models import User
    try:
        if request.method == 'POST':
            username = request.GET.get('username')
            u, created = User.objects.get_or_create(username=username)
            if created:
                return 'create_user', "User: %s has been created" % u.username
            else:
                return 'create_user', "User: %s already exists" % u.username
        else:
            return 'create_user', "User cannot be created with GET"
    except:
        return 'create_user', "User not created"

Included Status Checks

Django Ping includes a few checks to test various components live.

check_database_sessions - Hits your database and attempts to retrieve a single session.

check_database_sites - Hits your database and attempts to retrieve a single site instance.

check_cache_set - Attempts to cache a value using the current cache backend defined.

check_cache_get - Attempts to retrieve a cached value using the current cache backend defined.

check_celery - Adds a task to the queue and checks for celery to complete it.

Authentication

You can require HTTP Basic authentication to access the ping endpoint, set PING_BASIC_AUTH to True in your Django settings.

Provide in the request the username/password of a valid User.

Complete Settings List

Check ping.defaults for default values.

PING_RESPONSE = "Some string" PING_MIMETYPE = 'text/html' or valid content type PING_DEFAULT_CHECKS = tuple of paths to check methods PING_BASIC_AUTH = Boolean (default is False) PING_CELERY_TIMEOUT = In seconds as integers (5 is default)

What's Next?

Go sign up for a monitoring service or role your own.

https://www.pingdom.com/

http://www.panopta.com/

http://binarycanary.com/