django-microservices

About

Simple django package to easily "connect" microservices.

The package loads the service configurations (id, name, host) into a DB table from a json file which can be stored on a shared drive, or hosted on URL.

Installation

You can simply install the package with pip from PyPI or GitHub.

Install with pip from github

pip install git+https://github.com/gabor-boros/django-microservices.git

Install from pypi

pip install djangomicroservices

Configuration

Add the microservices app to your INSTALLED_APPS like this:

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'microservices',
    ...
]

After you added it to the INSTALLED_APPS, you must configure the path where your service configuration exists. The configuration file is a json file. Basically it is an output of python manage.py dumpdata command. It doesn't matter where is your file located. It can be hosted on a website, or located on a shared drive.

SERVICE_CONFIGURATION_FILE = 'http://myserver.com/services.json'

SERVICE_CONFIGURATION_FILE = 'services.json'

Service configuration example sample.json

[
    {
        "model": "microservices.service",
        "pk": 1,
        "fields": {
            "name": "auth",
            "host": "http://auth.example.com/",
        }
    },
    {
        "model": "microservices.service",
        "pk": 2,
        "fields": {
            "name": "search",
            "host": "http://search.example.com/",
        }
    }
]

Usage

After you are done with the installation and configuration, and you loaded your services, you are good to go. The usage is very simple. Query your service, and call the remote_call object method.

Remote call example

import json
from microservices.models import Service

def can_login(username, password):
    authentication_data = json.loads({"username": username: "password": password})

    authentication_service = Service.objects.get(name="auth")
    response = authentication_service.remote_call(
        method, api='/login/', data=authentication_data
    )

    if response.status_code == 200:
        return True

    return False

The package ships with an other object method called update_availability. This method can be used to update your service's status. To do this you can call it for the object as shown in the example below.

NOTE If the response code is 400, 404, 500 or 503, the value of is_available field will be False.

Update service status

from microservices.models import Service

for service in Service.objects.all():
    service.update_availability()

Management commands

Three management command ships with this package to help to manage your service configuration.

list_services - Lists your services ordered by their status
load_services - Loads the configuration from the given resource location, set in settings.py
check_services - Going thorough your configuration and tries to reach them.
- If the host sends any response (which is not error related), the service will be marked available
- If the response is an error, or the service can not be reached, the service's status will be unavailable

Tests

To run the tests for this package use the python manage.py test command as usual In case you would like to generate a coverage report as well, run the run_test_coverage.sh file.

Contributors

If you would like to help to develop this package please read the CONTRIBUTING guideline. Every PR is highly welcomed.

Django-microservices

Simple django package to easily manage your microservices.