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https://github.com/perdy/health-check

Health Check is an application that provides an API to check the health health_check of some parts and some utilities like ping requests. This application can works as standalone or included in a Django project.
https://github.com/perdy/health-check

checker django health python resources status

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Health Check is an application that provides an API to check the health health_check of some parts and some utilities like ping requests. This application can works as standalone or included in a Django project.

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README 

        
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Health Check

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:Version: 3.4.1

:Status: Production/Stable

:Author: José Antonio Perdiguero López



Health Check is an application that provides an API to check the health status of some parts and some utilities like

ping requests. This application can works as standalone or included in a Django project.



This application defines the following terms:



Provider

    Function that does a quick check or stats gathering and returns a json serializable value, such as dict, list or

    simple types.



Resource

    A service or functionality whose status needs to be known.



Said this, providers are grouped by resources. So you can use resource as a simple group, or as a component of your

application. E.g: A resource that represents your database with some checks over it, such as simple ping, check if your

application tables are created, if it contains data...



Quick start

===========



1. Install this package using pip:



.. code:: bash



    pip install health-check



2. *(Django)* Add *PROJECT_PATH* to your django settings module.

3. *(Django)* Add *health_check* to your **INSTALLED_APPS** settings like this:



.. code:: python



    INSTALLED_APPS = (

        ...

        'health_check',

    )



4. *(Django)* Add **Health Check** urls to your project urls:



.. code:: python



    urlpatterns = [

        ...

        url(r'^health/', include('health_check.urls')),

    ]



Check Providers

===============

Health Check provides a mechanism to add new custom check functions through **check providers**. Each check provider

will generate a new API method with an URL that uses the name of the provider. These functions must accept \*args and

\*\*kwargs and will return a JSON-serializable object through json.dumps() method, for example a ping function:



.. code:: python



    def ping(*args, **kwargs):

        return {'pong': True}



By default **Health Check** provides the follow checks:



Ping

    A ping to application.

    

    URL: `/api/health/ping`



Databases

    Check if databases are running.

    

    URL: `/api/health/databases`



Caches

    Check if caches are running.

    

    URL: `/api/health/caches`



Celery

    Check if celery workers defined in settings are running.

    

    URL: `/api/health/celery`



Databases stats

    Show stats for all databases.

    

    URL: `/api/stats/databases`



Celery stats

    Show celery worker stats.

    

    URL: `/api/stats/celery`



Code

    Source code stats such as current active branch, last commit, if debug is active...

    

    URL: `/api/stats/code`



Run providers

=============

The main goal of this application is to provide an easy way to run checks over defined resources, so there are different

ways to do it.



Command

-------

Health Check provides a command to query current health of a resource. This command can be call as:



.. code:: bash



    health_check {resource} [options]

    

Call a specific provider from a resource:



.. code:: bash



    health_check {resource} {provider} [options]



To get current status of health checks, and exit with an error if some check is failing:



.. code:: bash



    health_check health -e



Each resource has its own set of options that can be displayed through command help:



.. code:: bash



    health_check -h



Code

----

To run all providers of a specific resource:



.. code:: python



    from health_check.providers import Resource



    resource = Resource('resource_name')

    providers_result = resource()



A single provider can be executed:



.. code:: python



    from health_check.providers import Provider



    provider = Provider('path.to.provider_function')

    provider_result = provider()



Django

======

Health check adds some useful behavior to your Django application.



Health Check website

--------------------

A website that shows Health Check data is available in this application. It's possible access to follow URLs to get a

detailed view of your system health status. Those three pages will show results of providers configured (as explained in

settings section)::



    http://www.website.com/health/

    http://www.website.com/health/health/

    http://www.website.com/health/stats/



Health Check API

----------------

Health Check API can be used as a standalone application including only their urls:



.. code:: python



    urlpatterns = [

        ...

        url(r'^health/', include('health.api.urls')),

    ]



This API have a single url for each provider, that are grouped by resources.

Each provider can be queried alone, returning his current health status::



    http://your_domain/health/api/health/ping



Also there is a resource view that will return the health status of all providers::



    http://your_domain/health/api/health



For last, there is a root view that will return the health status of all providers from all resources::



    http://your_domain/health/api



Django management commands

--------------------------

Previous command can be used as Django management command:



.. code:: bash



    python manage.py health_check {resource} {provider} [options]



Settings

========

Health check settings can be added directly to Django settings module or create an specific module for them. If a

custom module (or class) is used, you must specify it through **HEALTH_CHECK_SETTINGS** environment variable.



To use a custom module for settings is necessary to specify the full path: *project.package.settings*. The same applies

to objects: *project.package.settings:SettingsObject*.



health_check_providers

----------------------

List of additional check providers. Each provider consists in a tuple of name, function complete path, args and kwargs.



Example:



.. code:: python



    HEALTH_CHECK_PROVIDERS = {

        'resource': (

            ('test', 'application.module.test_function', [1, 2], {'foo': 'bar'}),

        )

    }



Default:



.. code:: python



    providers = getattr(settings, 'HEALTH_CHECK_PROVIDERS', {

        'health': (

            ('ping', 'health_check.providers.health.ping', None, None),

            ('databases', 'health_check.providers.django.health.databases', None, None),

            ('caches', 'health_check.providers.django.health.caches', None, None),

        ),

        'stats': (

            ('databases', 'health_check.providers.django.stats.databases', None, None),

            ('code', 'health_check.providers.stats.code', None, None),

        )

    }



health_check_celery_workers

---------------------------

List of hostname from celery workers to be checked. If any worker is defined, two additional providers listed previously

will be added to default set.



Default:



.. code:: python



    health_check_celery_workers = ()