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⚙️ Adds Django 4.2 support and fixes trove classifiers (#363)
* ⚙️ Adds Django 4.2 support and fixes trove classifiers * :shirts: Runs black on code to make CI happy * :shirts: Runs isort on code to make CI happy * 💚 Updates test to match exception copy * 📝 mirrors old README.rst to make docs work Not a great solution, but a workaround. * ⚙️ Adds pip cache support * 🔥 Removes 4.0 from grid because it's no longer supported * ⚙️ Updates cache-key This isn't really used, but I think having caching is a win * ⚙️ Adds missing file * 🔥 Removes cache line * Fix storages deprecation warnings (#372) * ⚙️ Adds Django 4.2 support and fixes trove classifiers * :shirts: Runs black on code to make CI happy * :shirts: Runs isort on code to make CI happy * 💚 Updates test to match exception copy * 📝 mirrors old README.rst to make docs work Not a great solution, but a workaround. * ⚙️ Adds pip cache support * 🔥 Removes 4.0 from grid because it's no longer supported * ⚙️ Updates cache-key This isn't really used, but I think having caching is a win * ⚙️ Adds missing file * 🔥 Removes cache line * Fix storages deprecation warnings --------- Co-authored-by: Jeff Triplett <[email protected]> * Fix isort ordering --------- Co-authored-by: Bruno Alla <[email protected]> Co-authored-by: Frank Wiles <[email protected]>
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.. include:: ../README.rst | ||
django-health-check | ||
=================== | ||
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|version| |pyversion| |djversion| |license| | ||
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This project checks for various conditions and provides reports when | ||
anomalous behavior is detected. | ||
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The following health checks are bundled with this project: | ||
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- cache | ||
- database | ||
- storage | ||
- disk and memory utilization (via ``psutil``) | ||
- AWS S3 storage | ||
- Celery task queue | ||
- Celery ping | ||
- RabbitMQ | ||
- Migrations | ||
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Writing your own custom health checks is also very quick and easy. | ||
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We also like contributions, so don’t be afraid to make a pull request. | ||
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Use Cases | ||
--------- | ||
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The primary intended use case is to monitor conditions via HTTP(S), with | ||
responses available in HTML and JSON formats. When you get back a | ||
response that includes one or more problems, you can then decide the | ||
appropriate course of action, which could include generating | ||
notifications and/or automating the replacement of a failing node with a | ||
new one. If you are monitoring health in a high-availability environment | ||
with a load balancer that returns responses from multiple nodes, please | ||
note that certain checks (e.g., disk and memory usage) will return | ||
responses specific to the node selected by the load balancer. | ||
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Supported Versions | ||
------------------ | ||
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We officially only support the latest version of Python as well as the | ||
latest version of Django and the latest Django LTS version. | ||
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Installation | ||
------------ | ||
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First, install the ``django-health-check`` package: | ||
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.. code:: shell | ||
$ pip install django-health-check | ||
Add the health checker to a URL you want to use: | ||
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.. code:: python | ||
urlpatterns = [ | ||
# ... | ||
url(r'^ht/', include('health_check.urls')), | ||
] | ||
Add the ``health_check`` applications to your ``INSTALLED_APPS``: | ||
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.. code:: python | ||
INSTALLED_APPS = [ | ||
# ... | ||
'health_check', # required | ||
'health_check.db', # stock Django health checkers | ||
'health_check.cache', | ||
'health_check.storage', | ||
'health_check.contrib.migrations', | ||
'health_check.contrib.celery', # requires celery | ||
'health_check.contrib.celery_ping', # requires celery | ||
'health_check.contrib.psutil', # disk and memory utilization; requires psutil | ||
'health_check.contrib.s3boto3_storage', # requires boto3 and S3BotoStorage backend | ||
'health_check.contrib.rabbitmq', # requires RabbitMQ broker | ||
'health_check.contrib.redis', # requires Redis broker | ||
] | ||
**Note:** If using ``boto 2.x.x`` use | ||
``health_check.contrib.s3boto_storage`` | ||
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(Optional) If using the ``psutil`` app, you can configure disk and | ||
memory threshold settings; otherwise below defaults are assumed. If you | ||
want to disable one of these checks, set its value to ``None``. | ||
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.. code:: python | ||
HEALTH_CHECK = { | ||
'DISK_USAGE_MAX': 90, # percent | ||
'MEMORY_MIN': 100, # in MB | ||
} | ||
If using the DB check, run migrations: | ||
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.. code:: shell | ||
$ django-admin migrate | ||
To use the RabbitMQ healthcheck, please make sure that there is a | ||
variable named ``BROKER_URL`` on django.conf.settings with the required | ||
format to connect to your rabbit server. For example: | ||
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.. code:: python | ||
BROKER_URL = "amqp://myuser:mypassword@localhost:5672/myvhost" | ||
To use the Redis healthcheck, please make sure that there is a variable | ||
named ``REDIS_URL`` on django.conf.settings with the required format to | ||
connect to your redis server. For example: | ||
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.. code:: python | ||
REDIS_URL = "redis://localhost:6370" | ||
The cache healthcheck tries to write and read a specific key within the | ||
cache backend. It can be customized by setting ``HEALTHCHECK_CACHE_KEY`` | ||
to another value: | ||
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.. code:: python | ||
HEALTHCHECK_CACHE_KEY = "custom_healthcheck_key" | ||
Setting up monitoring | ||
--------------------- | ||
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You can use tools like Pingdom, StatusCake or other uptime robots to | ||
monitor service status. The ``/ht/`` endpoint will respond with an HTTP | ||
200 if all checks passed and with an HTTP 500 if any of the tests | ||
failed. Getting machine-readable JSON reports | ||
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If you want machine-readable status reports you can request the ``/ht/`` | ||
endpoint with the ``Accept`` HTTP header set to ``application/json`` or | ||
pass ``format=json`` as a query parameter. | ||
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The backend will return a JSON response: | ||
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.. code:: shell | ||
$ curl -v -X GET -H "Accept: application/json" http://www.example.com/ht/ | ||
> GET /ht/ HTTP/1.1 | ||
> Host: www.example.com | ||
> Accept: application/json | ||
> | ||
< HTTP/1.1 200 OK | ||
< Content-Type: application/json | ||
{ | ||
"CacheBackend": "working", | ||
"DatabaseBackend": "working", | ||
"S3BotoStorageHealthCheck": "working" | ||
} | ||
$ curl -v -X GET http://www.example.com/ht/?format=json | ||
> GET /ht/?format=json HTTP/1.1 | ||
> Host: www.example.com | ||
> | ||
< HTTP/1.1 200 OK | ||
< Content-Type: application/json | ||
{ | ||
"CacheBackend": "working", | ||
"DatabaseBackend": "working", | ||
"S3BotoStorageHealthCheck": "working" | ||
} | ||
Writing a custom health check | ||
----------------------------- | ||
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Writing a health check is quick and easy: | ||
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.. code:: python | ||
from health_check.backends import BaseHealthCheckBackend | ||
class MyHealthCheckBackend(BaseHealthCheckBackend): | ||
#: The status endpoints will respond with a 200 status code | ||
#: even if the check errors. | ||
critical_service = False | ||
def check_status(self): | ||
# The test code goes here. | ||
# You can use `self.add_error` or | ||
# raise a `HealthCheckException`, | ||
# similar to Django's form validation. | ||
pass | ||
def identifier(self): | ||
return self.__class__.__name__ # Display name on the endpoint. | ||
After writing a custom checker, register it in your app configuration: | ||
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.. code:: python | ||
from django.apps import AppConfig | ||
from health_check.plugins import plugin_dir | ||
class MyAppConfig(AppConfig): | ||
name = 'my_app' | ||
def ready(self): | ||
from .backends import MyHealthCheckBackend | ||
plugin_dir.register(MyHealthCheckBackend) | ||
Make sure the application you write the checker into is registered in | ||
your ``INSTALLED_APPS``. | ||
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Customizing output | ||
------------------ | ||
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You can customize HTML or JSON rendering by inheriting from ``MainView`` | ||
in ``health_check.views`` and customizing the ``template_name``, | ||
``get``, ``render_to_response`` and ``render_to_response_json`` | ||
properties: | ||
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.. code:: python | ||
# views.py | ||
from health_check.views import MainView | ||
class HealthCheckCustomView(MainView): | ||
template_name = 'myapp/health_check_dashboard.html' # customize the used templates | ||
def get(self, request, *args, **kwargs): | ||
plugins = [] | ||
status = 200 # needs to be filled status you need | ||
# ... | ||
if 'application/json' in request.META.get('HTTP_ACCEPT', ''): | ||
return self.render_to_response_json(plugins, status) | ||
return self.render_to_response(plugins, status) | ||
def render_to_response(self, plugins, status): # customize HTML output | ||
return HttpResponse('COOL' if status == 200 else 'SWEATY', status=status) | ||
def render_to_response_json(self, plugins, status): # customize JSON output | ||
return JsonResponse( | ||
{str(p.identifier()): 'COOL' if status == 200 else 'SWEATY' for p in plugins}, | ||
status=status | ||
) | ||
# urls.py | ||
import views | ||
urlpatterns = [ | ||
# ... | ||
url(r'^ht/$', views.HealthCheckCustomView.as_view(), name='health_check_custom'), | ||
] | ||
Django command | ||
-------------- | ||
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You can run the Django command ``health_check`` to perform your health | ||
checks via the command line, or periodically with a cron, as follow: | ||
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.. code:: shell | ||
django-admin health_check | ||
This should yield the following output: | ||
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:: | ||
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DatabaseHealthCheck ... working | ||
CustomHealthCheck ... unavailable: Something went wrong! | ||
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Similar to the http version, a critical error will cause the command to | ||
quit with the exit code ``1``. | ||
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Other resources | ||
--------------- | ||
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- `django-watchman <https://github.com/mwarkentin/django-watchman>`__ | ||
is a package that does some of the same things in a slightly | ||
different way. | ||
- See this | ||
`weblog <https://www.vincit.fi/en/blog/deploying-django-to-elastic-beanstalk-with-https-redirects-and-functional-health-checks/>`__ | ||
about configuring Django and health checking with AWS Elastic Load | ||
Balancer. | ||
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.. |version| image:: https://img.shields.io/pypi/v/django-health-check.svg | ||
:target: https://pypi.python.org/pypi/django-health-check/ | ||
.. |pyversion| image:: https://img.shields.io/pypi/pyversions/django-health-check.svg | ||
:target: https://pypi.python.org/pypi/django-health-check/ | ||
.. |djversion| image:: https://img.shields.io/pypi/djversions/django-health-check.svg | ||
:target: https://pypi.python.org/pypi/django-health-check/ | ||
.. |license| image:: https://img.shields.io/badge/license-MIT-blue.svg | ||
:target: https://pypi.python.org/pypi/django-health-check/ |
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class Migration(migrations.Migration): | ||
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initial = True | ||
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replaces = [ | ||
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