Installation Process:

1. Need to install mysql client the docs is here

2. Need MongoDB install

3. Install rabbitmq server

   apt-get install rabbitmq-server
   running: 
   rabbitmq-server
   

   MacOS

   brew install rabbitmq
   export PATH=$PATH:/usr/local/sbin
    
   running: 
   rabbitmq-server
   or 
   brew service start rabbitmq
   

4. install requirements from the requirements.txt file

   pip install -r requirements.txt
   

---

MultipleDB

1. Deault
   In my project I am adding mysql as default DB. Where db_name is testing. You dont need to DATABASE_ROUTERS for default DB

    'default': {
       'ENGINE': 'django.db.backends.mysql',
       'NAME': 'testing',
       'USER': 'root',
       'PASSWORD': 'root',
       'HOST': '127.0.0.1',   # Or an IP Address that your DB is hosted on
       'PORT': 3306,
       'OPTIONS': {
           'charset': 'utf8mb4',
       },
       'TEST': {
           'CHARSET': 'utf8mb4',
           'COLLATION': 'utf8mb4_unicode_ci',
       }
   }, 

2. another
   

3. MongoDB
   The source is found here Steps:
   

   • For mongodb we have to create an app mongoDBWork
     

   • install djongo for MongoDB engine
     

        pip install djongo
     

   • Add Db engine on setting.py
     

          DATABASES = {
             .
             .
     
             'mongo':{  
                 'ENGINE':   'djongo',
                 'NAME':     'local', # name of the database 
                 'CLIENT': {
                     'host': '127.0.0.1',
                     'port': 27017,
                     'username': 'user_name',
                     'password': 'password',
                     'authSource': 'auth db name'
                  }
             }
          }

   • Since it is not default Database we Have to add DATABASE_ROUTERS for this DB to your setting.py file
     

        DATABASE_ROUTERS = ['otherdbapp.router.OtherAppDB',"mongoDBwork.router.MongoDBRouter"]

     Description of DATABASE_ROUTERS:
     

     • mongoDBwork : App Name
       
     • router : router.py file inser
       
     • MongoDBRouter: class name on the router.py file
       
     • Please have a look on router.py file
       

   • Create a model name Posts
     

   • migration
     

     python manage.py makemigrations mongoDBwork
     

   • Migrate DB
     

     python manage.py migrate --database=mongo  

The database section contain 3 DB connected. Basically the second DB is also Mysql. Going forward I added postgresql as Second DB

Testcase:

---

Unittest is very importent for CI/CD. Whenever you wirte a code you need to initaiate test case for this code

Below I have added some code for testing the views functions( get apis)

1. urls.py for otherdbapp

	urlpatterns = [
          #url(r'^admin/', admin.site.urls),
   	  url(r'create_user', create_user),
  	  url(r'get_user/', get_user),
	]

from the urls.py we can see there is two basic(not REST) apis path(create_user, get_user). Now we can move the views function these path
2. The view function for these two url path are given here views.py

def create_user(requests):
    try:
        first_name = requests.GET.get("first_name")
        last_name = requests.GET.get("last_name")
        phone =  requests.GET.get('phone')
        email = requests.GET.get('email')
        data = Users.objects.create(first_name= first_name, last_name= last_name, phone = phone, email = email)
        uuid = data.id
        return Response_data.success_response([{'id': uuid}])
    except Exception as E:
        return Response_data.failure_response("Something Went Wrong", str(E))



def get_user(requests):
    return Response_data.failure_response("Something Went Wrong", "")	

3. Now we can write testcase for these two functions test.py
   

class TestView(unittest.TestCase):
    def test_create_users(self):
        client = Client()
        response= client.get(reverse(create_user), {'first_name': 'john', 'last_name': 'smith', 'phone': "......", 'email': "/........."})
        self.assertEqual(response.status_code, 200)

    def test_get_user(self):
        client = Client()
        response= client.get(reverse(get_user))
        self.assertEqual(response.status_code, 450)

TokenAuthentication:

---

I am trying to apply TokenAuthentication on My an api http://127.0.0.1:8000/data/get_all_data/. The process is given here step by step:

1. Install django rest framework

    pip install djangorestframework

2. Adding rest_framework 'rest_framework.authtoken' on my INSTALLED_APPS py and DEFAULT_AUTHENTICATION_CLASSES inside the testDjango/settings.py

INSTALLED_APPS = [
   .
   .
   .
    
    'rest_framework',
    'rest_framework.authtoken',  # <-- Here


    .
    .
    .
]

REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': [
        'rest_framework.authentication.TokenAuthentication',  # <-- And here
    ],
}

3. Then Run this command

python manage.py migrate
python manage.py createsuperuser --username Tareq --email tareqcse12@gmail.com

4. For getting the user (Tareq) token we need to add some code on testDjango/urls.py

from django.urls import path
from rest_framework.authtoken.views import obtain_auth_token  # <-- Here


urlpatterns = [
  #url(r'^admin/', admin.site.urls),
     .
     .
     .
     path('api-token-auth/', obtain_auth_token, name='api_token_auth')
]

5. Call the api with username and password for getting token

6. The token is generated now I want to authenticate my api using this credential. Now I am moving My app historical_data/views.py. I import the necessary libraries for this authentcation

from rest_framework.permissions import IsAuthenticated 
from rest_framework.decorators import api_view, permission_classes

@api_view(["GET"])
@permission_classes([IsAuthenticated])
def get_all_data(requests):
    try:
        event_data = PriceHistory.objects.filter()
        serializer = PriceHistorySerializer(event_data, many=True)
        return Response_data.success_response(serializer.data)
    except Exception as E:
        return Response_data.failure_response("Something Went Wrong", str(E))

7. The Authentication is added now I want to test it with Token and Without Token

With token request:

Without token request:

The source for TokenAuthentication is found here