Django REST Hooks Delivery

Various deliverers for django rest hooks and django rest hooks ng.

Installation

To get the latest stable release from PyPi

pip install django-rest-hooks-delivery

To get the latest commit from GitHub

pip install -e git+git://github.com/PressLabs/django-rest-hooks-delivery.git#egg=rest_hooks_delivery

Add rest_hooks_delivery to your INSTALLED_APPS

INSTALLED_APPS = (
    ...,
    'rest_hooks_delivery',
)

Don't forget to migrate your database

./manage.py migrate rest_hooks_delivery # if you are using django > 1.7

./manage.py syncdb rest_hooks_delivery # if you are using django < 1.7

Usage

This application depends on the django rest hooks application, which is an unmigrated application. You have to make sure that the django rest hooks application has been migrated (sync'd) before you run the migrations for rest_hooks_delivery.

Make sure you have added rest_hooks_delivery to the list of INSTALLED_APPS before django.contrib.admin and that you have set HOOK_DELIVERER to one of the available deliverers. Currently rest_hooks_delivery.deliverers.retry and rest_hooks_delivery.deliverers.batch are available.

To use the retry deliverer:

This deliverer uses threads to retry failed hook deliveries until they succeed.

### settings.py ###

INSTALLED_APPS = [
...
'rest_hooks_delivery',
'django.contrib.admin',
]

HOOK_DELIVERER = 'rest_hooks_delivery.deliverers.retry'

It also provides a management command useful for retrying failed hooks.

./manage.py retry_failed_hooks

To use the batch deliverer:

This deliverer tries to minimize server load by using Celery + Redis tasks to batch the hook deliveries. This deliverer operates on a per target URL basis. Everything explained in the rest of this section assumes this. The deliverer has 2 modes.

size

HOOK_DELIVERER_SETTINGS = {
    ...
    'size': 3, # Number of hook events per target URL
    ...
}

In size mode the deliverer will check the size setting and batch the hooks whenever they reach the specified size.

time

HOOK_DELIVERER_SETTINGS = {
    ...
    'time': 60, # Time to delay batching hook events for target URL(seconds)
    ...
}

In time mode the deliverer will trigger a delayed batching of hooks. It will read the time to delay from the time setting. This delayed batching is triggered when the first hook for a target URL is sent to the deliverer.

mixed

HOOK_DELIVERER_SETTINGS = {
    ...
    'time': 60,
    'size': 5,
    ...
}

The time and size modes can be mixed. The deliverer will batch by whichever event occurs first. To use this mode, provide both the time and size settings. The order of the settings in the configuration dictionary does not matter.

Note: It is important to use caution when choosing the configuration values for the deliverer as this can lead to resource misuse when not done properly.

If this deliverer is selected, do not forget to start a celery worker and a redis instance for your project.

celery -A proj worker -l info

redis-server

where proj is the name of your project.

Check the Celery website for a detailed example.

retry

HOOK_DELIVERER_SETTINGS = {
    ...
    'retry': {
        'retries': 2, # Number of times to retry failed deliveries
        'retry_interval': 5, # Time to delay between retries(seconds)
    }
    ...
}

This deliverer can also retry failed deliveries. When the retry setting is provided the deliverer will retry failed deliveries every retry_interval seconds until either successful or retries retries have failed, at which point it will give up. When the deliverer gives up it will discard all failed hooks for the current target URL. If this setting is not provided the deliverer will discard failed deliveries.

Example

### settings.py

...

INSTALLED_APPS = [
...
'rest_hooks_delivery',
'django.contrib.admin',
]

HOOK_DELIVERER = 'rest_hooks_delivery.deliverers.batch'

HOOK_DELIVERER_SETTINGS = {
    'size': 3,
    'time': 60,
    # You can comment out the mode you do not need above
    'retry': {
        'retries': 2,
        'retry_interval': 5,
    }
}

GradConnection / django-rest-hooks-delivery