# add counter app

apps/counter/admin.py

@@ -0,0 +1,3 @@
+from django.contrib import admin
+
+# Register your models here.

apps/counter/apps.py

@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+
+class CounterConfig(AppConfig):
+    name = 'counter'

apps/counter/models.py

@@ -0,0 +1 @@
+from django.db import models

apps/counter/tests.py

@@ -0,0 +1,3 @@
+from django.test import TestCase
+
+# Create your tests here.

apps/counter/views.py

@@ -0,0 +1,3 @@
+from django.shortcuts import render
+
+# Create your views here.

mosqkiller/database_router.py

@@ -0,0 +1,60 @@
+from django.conf import settings
+
+DATABASE_MAPPING = settings.DATABASE_APPS_MAPPING
+
+
+class DatabaseAppsRouter(object):
+    """
+    A router to control all database operations on models for different
+    databases.
+
+    In case an app is not set in settings.DATABASE_APPS_MAPPING, the router
+    will fallback to the `default` database.
+
+    Settings example:
+
+    DATABASE_APPS_MAPPING = {'counter': 'counter'}
+    """
+
+    def db_for_read(self, model, **hints):
+        """"Point all read operations to the specific database."""
+        if model._meta.app_label in DATABASE_MAPPING:
+            return DATABASE_MAPPING[model._meta.app_label]
+        return None
+
+    def db_for_write(self, model, **hints):
+        """Point all write operations to the specific database."""
+        if model._meta.app_label in DATABASE_MAPPING:
+            return DATABASE_MAPPING[model._meta.app_label]
+        return None
+
+    def allow_relation(self, obj1, obj2, **hints):
+        """Allow any relation between apps that use the same database."""
+        db_obj1 = DATABASE_MAPPING.get(obj1._meta.app_label)
+        db_obj2 = DATABASE_MAPPING.get(obj2._meta.app_label)
+        if db_obj1 and db_obj2:
+            if db_obj1 == db_obj2:
+                return True
+            else:
+                return False
+        return None
+
+    def allow_syncdb(self, db, model):
+        """Make sure that apps only appear in the related database."""
+
+        if db in DATABASE_MAPPING.values():
+            return DATABASE_MAPPING.get(model._meta.app_label) == db
+        elif model._meta.app_label in DATABASE_MAPPING:
+            return False
+        return None
+
+    def allow_migrate(self, db, app_label, model=None, **hints):
+        """
+        Make sure the auth app only appears in the 'auth_db'
+        database.
+        """
+        if db in DATABASE_MAPPING.values():
+            return DATABASE_MAPPING.get(app_label) == db
+        elif app_label in DATABASE_MAPPING:
+            return False
+        return None

mosqkiller/settings.py

@@ -97,9 +97,20 @@ DATABASES = {
         'PASSWORD': 'Q5BkPk62mqeBxI_lHh2',
         'HOST': '47.106.73.20',
         'PORT': 3326
+    },
+    'counter': {
+        'ENGINE': 'django.db.backends.mysql',
+        'NAME': 'counter',
+        'USER': 'mosq_admin',
+        'PASSWORD': 'Q5BkPk62mqeBxI_lHh2',
+        'HOST': '47.106.73.20',
+        'PORT': 3306
     }
 }
 
+DATABASE_APPS_MAPPING = {
+    'counter': 'counter'
+}
 
 # Password validation
 # https://docs.djangoproject.com/en/2.0/ref/settings/#auth-password-validators