initial commit

2022-05-13 13:53:52 +07:00 · 2022-05-13 13:53:52 +07:00 · 5b6a03b1f9
commit 5b6a03b1f9
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--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,283 @@
+
+# Created by https://www.toptal.com/developers/gitignore/api/django,pycharm+all
+# Edit at https://www.toptal.com/developers/gitignore?templates=django,pycharm+all
+
+### Django ###
+*.log
+*.pot
+*.pyc
+__pycache__/
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+media
+
+env/*
+
+# If your build process includes running collectstatic, then you probably don't need or want to include staticfiles/
+# in your Git repository. Update and uncomment the following line accordingly.
+# <django-project-name>/staticfiles/
+
+### Django.Python Stack ###
+# Byte-compiled / optimized / DLL files
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
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+.installed.cfg
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+MANIFEST
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+
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+
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+profile_default/
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+# pyenv
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+#   intended to run in multiple environments; otherwise, check them in:
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+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
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+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
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+ENV/
+env.bak/
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+### PyCharm+all ###
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+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
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+.idea/**/dynamic.xml
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+# IntelliJ
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+### PyCharm+all Patch ###
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+# See https://github.com/joeblau/gitignore.io/issues/186 and https://github.com/joeblau/gitignore.io/issues/360
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+.idea/
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+*.iml
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+# Sonarlint plugin
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+# End of https://www.toptal.com/developers/gitignore/api/django,pycharm+all
+
+
+# Created by https://www.toptal.com/developers/gitignore/api/macos
+# Edit at https://www.toptal.com/developers/gitignore?templates=macos
+
+### macOS ###
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+# End of https://www.toptal.com/developers/gitignore/api/macos
--- a/README.md
+++ b/README.md
@ -0,0 +1,178 @@
+# Yuyu
+
+Yuyu provide ability to manage openstack billing by listening to every openstack event. Yuyu is a required component to use Yuyu Dashboard. There are 3 main component in Yuyu: API, Cron, Event Monitor 
+
+## Yuyu API
+Main component to communicate with Yuyu Dashboard.
+
+## Yuyu Cron
+Provide invoice calculation and rolling capabilities that needed to run every month.
+
+## Yuyu Event Monitor
+Monitor event from openstack to calculate billing spent.
+
+# System Requirement
+- Python 3
+- Openstack
+- Virtualenv
+- Linux environment with Systemd
+
+# Pre-Installation
+
+### Virtualenv
+Make sure you installed virtualenv before installing Yuyu
+
+```bash
+pip3 install virtualenv
+```
+
+### Timezone
+
+Billing is a time sensitive application, please make sure you set a correct time and timezone on you machine.
+
+### Openstack Service Notification
+You need to enable notification for this openstack service:
+- Nova (nova.conf)
+- Cinder (cinder.conf)
+- Neutron (neutron.conf)
+
+### Nova
+Add configuration below on `[oslo_messaging_notifications]`
+
+```
+driver = messagingv2 
+topics = notifications
+```
+
+Add configuration below on `[notifications]`
+
+```
+notify_on_state_change = vm_and_task_state
+notification_format = unversioned
+```
+
+### Cinder & Neutron
+
+Add configuration below on `[oslo_messaging_notifications]`
+
+```
+driver = messagingv2 
+topics = notifications
+```
+
+### Kolla Note
+If you using Kolla, please add configuration above on all service container. For example on Nova you should put the config on `nova-api`, `nova-scheduler`, etc.
+
+# Installation
+
+Clone the latest source code and put it on any directory you want. Here i assume you put it on `/var/yuyu/`
+
+```bash
+cd /var/yuyu/
+git clone {repository}
+cd yuyu
+```
+
+Then create virtualenv and activate it
+```bash
+virtualenv env --python=python3.8
+source env/bin/activate
+pip install -r requirements.txt
+```
+
+Then create a configuration file, just copy from sample file and modify as your preference.
+
+```bash
+cp yuyu/local_settings.py.sample yuyu/local_settings.py
+```
+
+Please read [Local Setting Configuration](#local-setting-configuration) to get to know about what configuration you should change.
+
+Then run the database migration
+
+```bash
+python manage.py migrate
+```
+
+Then create first superuser
+
+```bash
+python manage.py createsuperuser
+```
+
+## Local Setting Configuration
+
+### YUYU_NOTIFICATION_URL (required)
+A Messaging Queue URL that used by Openstack, usually it is a RabbitMQ URL.
+
+Example: 
+```
+YUYU_NOTIFICATION_URL = "rabbit://openstack:password@127.0.0.1:5672/"
+```
+
+### YUYU_NOTIFICATION_TOPICS (required)
+A list of topic notification topic that is configured on each openstack service
+
+Example: 
+```
+YUYU_NOTIFICATION_TOPICS = ["notifications"]
+```
+
+
+### DATABASE
+By default, it will use Sqlite. If you want to change it to other database please refer to Django Setting documentation.
+
+- https://docs.djangoproject.com/en/3.2/ref/settings/#databases
+- https://docs.djangoproject.com/en/3.2/ref/databases/
+
+## API Installation
+
+To install Yuyu API, you need to execute this command.
+
+```bash
+./bin/setup_api.sh
+```
+
+This will install `yuyu_api` service
+
+To start the service use this command
+```bash
+systemctl enable yuyu_api
+systemctl start yuyu_api
+```
+
+An API server will be open on port `8182`. 
+
+## Event Monitor Installation
+
+To install Yuyu API, you need to execute this command.
+
+```bash
+./bin/setup_event_monitor.sh
+```
+
+
+This will install `yuyu_event_monitor` service
+
+To start the service use this command
+```bash
+systemctl enable yuyu_event_monitor
+systemctl start yuyu_event_monitor
+```
+
+## Cron Installation
+
+There is a cronjob that needed to be run every month on 00:01 AM. This cronjob will finish all in progress invoice and start new invoice for the next month.
+
+To install it, you can use `crontab -e`.
+
+Put this expression on the crontab
+
+```
+1 0 1 * * $yuyu_dir/bin/process_invoice.sh 
+```
+
+Replace $yuyu_dir with the directory of where yuyu is located. Example
+```
+1 0 1 * * /var/yuyu/bin/process_invoice.sh
+```
--- a/api/init.py
+++ b/api/init.py
--- a/api/apps.py
+++ b/api/apps.py
@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class ApiConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'api'
--- a/api/serializers.py
+++ b/api/serializers.py
@ -0,0 +1,56 @@
+from djmoney.contrib.django_rest_framework import MoneyField
+from rest_framework import serializers
+
+from core.models import Invoice
+from core.component import component
+
+
+class InvoiceComponentSerializer(serializers.ModelSerializer):
+    adjusted_end_date = serializers.DateTimeField()
+    price_charged = MoneyField(max_digits=10, decimal_places=0)
+    price_charged_currency = serializers.CharField(source="price_charged.currency")
+
+
+def generate_invoice_component_serializer(model):
+    """
+    Generate Invoice Component Serializer for particular model
+    :param model: The invoice component model
+    :return: serializer for particular model
+    """
+    name = type(model).__name__
+    meta_params = {
+        "model": model,
+        "fields": "__all__"
+    }
+    meta_class = type("Meta", (object,), meta_params)
+    serializer_class = type(f"{name}Serializer", (InvoiceComponentSerializer,), {"Meta": meta_class})
+
+    return serializer_class
+
+
+class InvoiceSerializer(serializers.ModelSerializer):
+    subtotal = MoneyField(max_digits=10, decimal_places=0)
+    subtotal_currency = serializers.CharField(source="subtotal.currency")
+    total = MoneyField(max_digits=10, decimal_places=0)
+    total_currency = serializers.CharField(source="total.currency", required=False)
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        for field, model in component.INVOICE_COMPONENT_MODEL.items():
+            self.fields[field] = generate_invoice_component_serializer(model)(many=True)
+
+    class Meta:
+        model = Invoice
+        fields = '__all__'
+
+
+class SimpleInvoiceSerializer(serializers.ModelSerializer):
+    subtotal = MoneyField(max_digits=10, decimal_places=0)
+    subtotal_currency = serializers.CharField(source="subtotal.currency")
+    total = MoneyField(max_digits=10, decimal_places=0)
+    total_currency = serializers.CharField(source="total.currency", required=False)
+
+    class Meta:
+        model = Invoice
+        fields = ['id', 'start_date', 'end_date', 'state', 'tax', 'subtotal', 'subtotal_currency', 'total',
+                  'total_currency']
--- a/api/urls.py
+++ b/api/urls.py
@ -0,0 +1,19 @@
+from django.urls import path, include
+from rest_framework import routers
+
+from api import views
+from core.component import component
+
+router = routers.DefaultRouter()
+for name, model in component.PRICE_MODEL.items():
+    router.register(f"price/{name}", views.get_generic_model_view_set(model))
+
+router.register(r'settings', views.DynamicSettingViewSet, basename='settings')
+router.register(r'invoice', views.InvoiceViewSet, basename='invoice')
+router.register(r'admin_overview', views.AdminOverviewViewSet, basename='admin_overview')
+router.register(r'project_overview', views.ProjectOverviewViewSet, basename='project_overview')
+
+urlpatterns = [
+    path('', include(router.urls)),
+    path('api-auth/', include('rest_framework.urls')),
+]
--- a/api/views.py
+++ b/api/views.py
@ -0,0 +1,299 @@
+import dateutil.parser
+import pytz
+from django.db import transaction
+from django.utils import timezone
+from rest_framework import viewsets, serializers
+from rest_framework.decorators import action
+from rest_framework.response import Response
+
+from api.serializers import InvoiceSerializer, SimpleInvoiceSerializer
+from core.component import component
+from core.component.component import INVOICE_COMPONENT_MODEL
+from core.exception import PriceNotFound
+from core.models import Invoice, BillingProject
+from core.utils.dynamic_setting import get_dynamic_settings, get_dynamic_setting, set_dynamic_setting, BILLING_ENABLED
+
+
+def get_generic_model_view_set(model):
+    name = type(model).__name__
+    meta_params = {
+        "model": model,
+        "fields": "__all__"
+    }
+    meta_class = type("Meta", (object,), meta_params)
+    serializer_class = type(f"{name}Serializer", (serializers.ModelSerializer,), {"Meta": meta_class})
+
+    view_set_params = {
+        "model": model,
+        "queryset": model.objects,
+        "serializer_class": serializer_class
+    }
+
+    return type(f"{name}ViewSet", (viewsets.ModelViewSet,), view_set_params)
+
+
+class DynamicSettingViewSet(viewsets.ViewSet):
+    def list(self, request):
+        return Response(get_dynamic_settings())
+
+    def retrieve(self, request, pk=None):
+        return Response({
+            pk: get_dynamic_setting(pk)
+        })
+
+    def update(self, request, pk=None):
+        set_dynamic_setting(pk, request.data['value'])
+        return Response({
+            pk: get_dynamic_setting(pk)
+        })
+
+    def partial_update(self, request, pk=None):
+        set_dynamic_setting(pk, request.data['value'])
+        return Response({
+            pk: get_dynamic_setting(pk)
+        })
+
+
+class InvoiceViewSet(viewsets.ModelViewSet):
+    serializer_class = InvoiceSerializer
+
+    def get_queryset(self):
+        tenant_id = self.request.query_params.get('tenant_id', None)
+        return Invoice.objects.filter(project__tenant_id=tenant_id).order_by('-start_date')
+
+    def parse_time(self, time):
+        dt = dateutil.parser.isoparse(time)
+        if not dt.tzinfo:
+            return pytz.UTC.localize(dt=dt)
+
+        return dt
+
+    @action(detail=False)
+    def simple_list(self, request):
+        serializer = SimpleInvoiceSerializer(self.get_queryset(), many=True)
+        return Response(serializer.data)
+
+    @action(detail=False, methods=['POST'])
+    def enable_billing(self, request):
+        try:
+            self.handle_init_billing(request.data)
+            return Response({
+                "status": "success"
+            })
+        except PriceNotFound as e:
+            return Response({
+                "message": str(e.identifier) + " price not found. Please check price configuration"
+            }, status=400)
+
+    @action(detail=False, methods=['POST'])
+    def disable_billing(self, request):
+        set_dynamic_setting(BILLING_ENABLED, False)
+        return Response({
+            "status": "success"
+        })
+
+    @action(detail=False, methods=['POST'])
+    def reset_billing(self, request):
+        self.handle_reset_billing()
+        return Response({
+            "status": "success"
+        })
+
+    @transaction.atomic
+    def handle_init_billing(self, data):
+        set_dynamic_setting(BILLING_ENABLED, True)
+
+        projects = {}
+        invoices = {}
+
+        date_today = timezone.now()
+        month_first_day = date_today.replace(day=1, hour=0, minute=0, second=0, microsecond=0)
+
+        for name, handler in component.INVOICE_HANDLER.items():
+            payloads = data[name]
+
+            for payload in payloads:
+
+                if payload['tenant_id'] not in projects:
+                    project, created = BillingProject.objects.get_or_create(tenant_id=payload['tenant_id'])
+                    projects[payload['tenant_id']] = project
+
+                if payload['tenant_id'] not in invoices:
+                    invoice = Invoice.objects.create(
+                        project=projects[payload['tenant_id']],
+                        start_date=month_first_day,
+                        state=Invoice.InvoiceState.IN_PROGRESS
+                    )
+                    invoices[payload['tenant_id']] = invoice
+
+                start_date = self.parse_time(payload['start_date'])
+                if start_date < month_first_day:
+                    start_date = month_first_day
+
+                payload['start_date'] = start_date
+                payload['invoice'] = invoices[payload['tenant_id']]
+
+                # create not accepting tenant_id, delete it
+                del payload['tenant_id']
+                handler.create(payload)
+
+    @transaction.atomic
+    def handle_reset_billing(self):
+        set_dynamic_setting(BILLING_ENABLED, False)
+
+        BillingProject.objects.all().delete()
+        for name, handler in component.INVOICE_HANDLER.items():
+            handler.delete()
+
+        for name, model in component.PRICE_MODEL.items():
+            model.objects.all().delete()
+
+    @action(detail=True)
+    def finish(self, request, pk):
+        invoice = Invoice.objects.filter(id=pk).first()
+        if invoice.state == Invoice.InvoiceState.UNPAID:
+            invoice.finish()
+
+        serializer = InvoiceSerializer(invoice)
+        return Response(serializer.data)
+
+    @action(detail=True)
+    def rollback_to_unpaid(self, request, pk):
+        invoice = Invoice.objects.filter(id=pk).first()
+        if invoice.state == Invoice.InvoiceState.FINISHED:
+            invoice.rollback_to_unpaid()
+
+        serializer = InvoiceSerializer(invoice)
+        return Response(serializer.data)
+
+
+class AdminOverviewViewSet(viewsets.ViewSet):
+    def list(self, request):
+        return Response({})
+
+    @action(detail=False, methods=['GET'])
+    def total_resource(self, request):
+        data = {
+            'label': [],
+            'data': [],
+        }
+        for k, v in INVOICE_COMPONENT_MODEL.items():
+            data['label'].append(k)
+            data['data'].append(v.objects.filter(invoice__state=Invoice.InvoiceState.IN_PROGRESS).count())
+
+        return Response(data)
+
+    @action(detail=False, methods=['GET'])
+    def active_resource(self, request):
+        data = {
+            'label': [],
+            'data': [],
+        }
+        for k, v in INVOICE_COMPONENT_MODEL.items():
+            data['label'].append(k)
+            data['data'].append(
+                v.objects.filter(invoice__state=Invoice.InvoiceState.IN_PROGRESS, end_date=None).count())
+
+        return Response(data)
+
+    @action(detail=False, methods=['GET'])
+    def price_total_resource(self, request):
+        data = {
+            'label': [],
+            'data': [],
+        }
+        for k, v in INVOICE_COMPONENT_MODEL.items():
+            sum_of_price = sum([q.price_charged.amount for q in
+                                v.objects.filter(invoice__state=Invoice.InvoiceState.IN_PROGRESS).all()])
+
+            data['label'].append(k)
+            data['data'].append(sum_of_price)
+
+        return Response(data)
+
+    @action(detail=False, methods=['GET'])
+    def price_active_resource(self, request):
+        data = {
+            'label': [],
+            'data': [],
+        }
+        for k, v in INVOICE_COMPONENT_MODEL.items():
+            sum_of_price = sum([q.price_charged.amount for q in
+                                v.objects.filter(invoice__state=Invoice.InvoiceState.IN_PROGRESS, end_date=None).all()])
+
+            data['label'].append(k)
+            data['data'].append(sum_of_price)
+
+        return Response(data)
+
+
+class ProjectOverviewViewSet(viewsets.ViewSet):
+    def list(self, request):
+        return Response({})
+
+    @action(detail=False, methods=['GET'])
+    def total_resource(self, request):
+        tenant_id = self.request.query_params.get('tenant_id', None)
+        project = BillingProject.objects.filter(tenant_id=tenant_id).first()
+        data = {
+            'label': [],
+            'data': [],
+        }
+        for k, v in INVOICE_COMPONENT_MODEL.items():
+            data['label'].append(k)
+            data['data'].append(
+                v.objects.filter(invoice__project=project, invoice__state=Invoice.InvoiceState.IN_PROGRESS).count())
+
+        return Response(data)
+
+    @action(detail=False, methods=['GET'])
+    def active_resource(self, request):
+        tenant_id = self.request.query_params.get('tenant_id', None)
+        project = BillingProject.objects.filter(tenant_id=tenant_id).first()
+        data = {
+            'label': [],
+            'data': [],
+        }
+        for k, v in INVOICE_COMPONENT_MODEL.items():
+            data['label'].append(k)
+            data['data'].append(
+                v.objects.filter(invoice__project=project, invoice__state=Invoice.InvoiceState.IN_PROGRESS,
+                                 end_date=None).count())
+
+        return Response(data)
+
+    @action(detail=False, methods=['GET'])
+    def price_total_resource(self, request):
+        tenant_id = self.request.query_params.get('tenant_id', None)
+        project = BillingProject.objects.filter(tenant_id=tenant_id).first()
+        data = {
+            'label': [],
+            'data': [],
+        }
+        for k, v in INVOICE_COMPONENT_MODEL.items():
+            sum_of_price = sum([q.price_charged.amount for q in
+                                v.objects.filter(invoice__project=project,
+                                                 invoice__state=Invoice.InvoiceState.IN_PROGRESS).all()])
+
+            data['label'].append(k)
+            data['data'].append(sum_of_price)
+
+        return Response(data)
+
+    @action(detail=False, methods=['GET'])
+    def price_active_resource(self, request):
+        tenant_id = self.request.query_params.get('tenant_id', None)
+        project = BillingProject.objects.filter(tenant_id=tenant_id).first()
+        data = {
+            'label': [],
+            'data': [],
+        }
+        for k, v in INVOICE_COMPONENT_MODEL.items():
+            sum_of_price = sum([q.price_charged.amount for q in
+                                v.objects.filter(invoice__project=project,
+                                                 invoice__state=Invoice.InvoiceState.IN_PROGRESS, end_date=None).all()])
+
+            data['label'].append(k)
+            data['data'].append(sum_of_price)
+
+        return Response(data)
--- a/bin/process_invoice.sh
+++ b/bin/process_invoice.sh
@ -0,0 +1,6 @@
+#!/bin/bash
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+cd $SCRIPT_DIR || exit
+cd ..
+./env/bin/python manage.py process_invoice
--- a/bin/setup_api.sh
+++ b/bin/setup_api.sh
@ -0,0 +1,16 @@
+#!/bin/bash
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+cd $SCRIPT_DIR || exit
+cd ..
+
+echo "Installing Yuyu API Service"
+yuyu_dir=`pwd -P`
+
+echo "Yuyu dir is $yuyu_dir"
+
+yuyu_dir_sub=${yuyu_dir//\//\\\/}
+sed "s/{{yuyu_dir}}/$yuyu_dir_sub/g" "$yuyu_dir"/script/yuyu_api.service > /etc/systemd/system/yuyu_api.service
+
+echo "Yuyu API Service Installed on /etc/systemd/system/yuyu_api.service"
+echo "Done! you can enable Yuyu API with systemctl start yuyu_api"
--- a/bin/setup_event_monitor.sh
+++ b/bin/setup_event_monitor.sh
@ -0,0 +1,17 @@
+#!/bin/bash
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+cd $SCRIPT_DIR || exit
+cd ..
+
+
+echo "Installing Yuyu Event Monitor Service"
+yuyu_dir=`pwd -P`
+
+echo "Yuyu dir is $yuyu_dir"
+
+yuyu_dir_sub=${yuyu_dir//\//\\\/}
+sed "s/{{yuyu_dir}}/$yuyu_dir_sub/g" "$yuyu_dir"/script/yuyu_event_monitor.service > /etc/systemd/system/yuyu_event_monitor.service
+
+echo "Yuyu Event Monitor Service Installed on /etc/systemd/system/yuyu_event_monitor.service"
+echo "Done! you can enable Yuyu Event Monitor with systemctl start yuyu_event_monitor"
--- a/core/init.py
+++ b/core/init.py
--- a/core/admin.py
+++ b/core/admin.py
@ -0,0 +1,79 @@
+from django.contrib import admin
+
+from core.models import FlavorPrice, VolumePrice, FloatingIpsPrice, BillingProject, Invoice, InvoiceVolume, \
+    InvoiceFloatingIp, InvoiceInstance, DynamicSetting, InvoiceImage, ImagePrice, SnapshotPrice, RouterPrice, \
+    InvoiceSnapshot, InvoiceRouter
+
+
+@admin.register(DynamicSetting)
+class FlavorPriceAdmin(admin.ModelAdmin):
+    list_display = ('key', 'value', 'type')
+
+
+@admin.register(FlavorPrice)
+class FlavorPriceAdmin(admin.ModelAdmin):
+    list_display = ('flavor_id', 'hourly_price', 'monthly_price')
+
+
+@admin.register(FloatingIpsPrice)
+class FloatingIpsPriceAdmin(admin.ModelAdmin):
+    list_display = ('hourly_price', 'monthly_price')
+
+
+@admin.register(VolumePrice)
+class VolumePriceAdmin(admin.ModelAdmin):
+    list_display = ('volume_type_id', 'hourly_price', 'monthly_price')
+
+
+@admin.register(RouterPrice)
+class RouterPriceAdmin(admin.ModelAdmin):
+    list_display = ('hourly_price', 'monthly_price')
+
+
+@admin.register(SnapshotPrice)
+class SnapshotPriceAdmin(admin.ModelAdmin):
+    list_display = ('hourly_price', 'monthly_price')
+
+@admin.register(ImagePrice)
+class ImagePriceAdmin(admin.ModelAdmin):
+    list_display = ('hourly_price', 'monthly_price')
+
+
+@admin.register(BillingProject)
+class BillingProjectAdmin(admin.ModelAdmin):
+    list_display = ('tenant_id',)
+
+
+@admin.register(Invoice)
+class InvoiceAdmin(admin.ModelAdmin):
+    list_display = ('__str__', 'project', 'start_date')
+
+
+@admin.register(InvoiceInstance)
+class InvoiceInstanceAdmin(admin.ModelAdmin):
+    list_display = ('instance_id',)
+
+
+@admin.register(InvoiceFloatingIp)
+class InvoiceFloatingIpAdmin(admin.ModelAdmin):
+    list_display = ('fip_id',)
+
+
+@admin.register(InvoiceVolume)
+class InvoiceVolumeAdmin(admin.ModelAdmin):
+    list_display = ('volume_id',)
+
+
+@admin.register(InvoiceRouter)
+class InvoiceRouterAdmin(admin.ModelAdmin):
+    list_display = ('router_id', 'name')
+
+
+@admin.register(InvoiceSnapshot)
+class InvoiceSnapshotAdmin(admin.ModelAdmin):
+    list_display = ('snapshot_id', 'name', 'space_allocation_gb')
+
+@admin.register(InvoiceImage)
+class InvoiceImageAdmin(admin.ModelAdmin):
+    list_display = ('image_id', 'name', 'space_allocation_gb')
+
--- a/core/apps.py
+++ b/core/apps.py
@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class CoreConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'core'
--- a/core/component/base/init.py
+++ b/core/component/base/init.py
--- a/core/component/base/event_handler.py
+++ b/core/component/base/event_handler.py
@ -0,0 +1,123 @@
+import abc
+
+from django.db import transaction
+from django.utils import timezone
+
+from core.models import Invoice, BillingProject
+from core.component.base.invoice_handler import InvoiceHandler
+
+
+class EventHandler(metaclass=abc.ABCMeta):
+    def __init__(self, invoice_handler):
+        self.invoice_handler: InvoiceHandler = invoice_handler
+
+    def get_tenant_progress_invoice(self, tenant_id):
+        """
+        Get in progress invoice for specific tenant id.
+        Will create new instance if active invoice not found.
+        And will create new billing project if tenant id not found.
+        :param tenant_id: Tenant id to get the invoice from.
+        :return:
+        """
+        invoice = Invoice.objects.filter(project__tenant_id=tenant_id, state=Invoice.InvoiceState.IN_PROGRESS).first()
+        if not invoice:
+            project = BillingProject.objects.get_or_create(tenant_id=tenant_id)
+            date_today = timezone.now()
+            month_first_day = date_today.replace(day=1, hour=0, minute=0, second=0, microsecond=0)
+            invoice = Invoice.objects.create(
+                project=project,
+                start_date=month_first_day,
+                state=Invoice.InvoiceState.IN_PROGRESS
+            )
+
+        return invoice
+
+    @abc.abstractmethod
+    def handle(self, event_type, raw_payload):
+        """
+        Handle event from the message queue
+        :param event_type: The event type
+        :param raw_payload: Payload inside the message
+        :return:
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def clean_payload(self, event_type, raw_payload):
+        """
+        Clean raw payload into payload that can be accepted by invoice handler
+        :param event_type: Current event type
+        :param raw_payload: Raw payload from messaging queue
+        :return:
+        """
+        raise NotImplementedError()
+
+    @transaction.atomic
+    def handle_create(self, invoice: Invoice, event_type, raw_payload):
+        """
+        Create new invoice component that will be saved to current invoice.
+
+        You need to call this method manually from handle() if you want to use it.
+
+        :param invoice: The invoice that will be saved into
+        :param event_type: Current event type
+        :param raw_payload: Raw payload from messaging queue.
+        :return:
+        """
+        payload = self.clean_payload(event_type, raw_payload)
+        instance = self.invoice_handler.get_active_instance(invoice, payload)
+        if not instance:
+            payload['invoice'] = invoice
+            payload['start_date'] = timezone.now()
+
+            self.invoice_handler.create(payload, fallback_price=True)
+
+            return True
+
+        return False
+
+    @transaction.atomic
+    def handle_delete(self, invoice: Invoice, event_type, raw_payload):
+        """
+        Close invoice component when delete event occurred.
+
+        You need to call this method manually from handle() if you want to use it.
+
+        :param invoice: The invoice that will be saved into
+        :param event_type: Current event type
+        :param raw_payload: Raw payload from messaging queue.
+        :return:
+        """
+        payload = self.clean_payload(event_type, raw_payload)
+        instance = self.invoice_handler.get_active_instance(invoice, payload)
+        if instance:
+            self.invoice_handler.update_and_close(instance, payload)
+            return True
+
+        return False
+
+    @transaction.atomic
+    def handle_update(self, invoice: Invoice, event_type, raw_payload):
+        """
+        Update invoice component when update event occurred.
+
+        You need to call this method manually from handle() if you want to use it.
+
+        :param invoice: The invoice that will be saved into
+        :param event_type: Current event type
+        :param raw_payload: Raw payload from messaging queue.
+        :return:
+        """
+        payload = self.clean_payload(event_type, raw_payload)
+        instance = self.invoice_handler.get_active_instance(invoice, payload)
+
+        if instance:
+            if self.invoice_handler.is_price_dependency_changed(instance, payload):
+                self.invoice_handler.roll(instance, close_date=timezone.now(), update_payload=payload, fallback_price=True)
+                return True
+
+            if self.invoice_handler.is_informative_changed(instance, payload):
+                self.invoice_handler.update(instance, update_payload=payload)
+                return True
+
+        return False
--- a/core/component/base/invoice_handler.py
+++ b/core/component/base/invoice_handler.py
@ -0,0 +1,167 @@
+import abc
+
+from django.conf import settings
+from django.utils import timezone
+from djmoney.money import Money
+
+from core.exception import PriceNotFound
+from core.models import InvoiceComponentMixin, PriceMixin
+
+
+class InvoiceHandler(metaclass=abc.ABCMeta):
+    INVOICE_CLASS = None
+    KEY_FIELD = None
+    INFORMATIVE_FIELDS = []
+    PRICE_DEPENDENCY_FIELDS = []
+
+    def create(self, payload, fallback_price=False):
+        """
+        Create new invoice component
+        :param payload: the data that will be created
+        :param fallback_price: Whether use 0 price if price not found
+        :return:
+        """
+        try:
+            price = self.get_price(payload)
+            if price is None:
+                raise PriceNotFound()
+        except PriceNotFound:
+            if fallback_price:
+                price = PriceMixin()
+                price.hourly_price = Money(amount=0, currency=settings.DEFAULT_CURRENCY)
+                price.monthly_price = Money(amount=0, currency=settings.DEFAULT_CURRENCY)
+            else:
+                raise
+
+        payload['hourly_price'] = price.hourly_price
+        payload['monthly_price'] = price.monthly_price
+
+        self.INVOICE_CLASS.objects.create(**payload)
+
+    def delete(self):
+        self.INVOICE_CLASS.objects.all().delete()
+
+    def roll(self, instance: InvoiceComponentMixin, close_date, update_payload=None, fallback_price=False):
+        """
+        Roll current instance.
+        Close current component instance and clone it
+        :param instance: The instance that want to be rolled
+        :param close_date: The close date of current instance
+        :param update_payload: New data to update the next component instance
+        :param fallback_price: Whether use 0 price if price not found
+        :return:
+        """
+        if update_payload is None:
+            update_payload = {}
+
+        if not instance.is_closed():
+            instance.close(close_date)
+
+        # Set primary ke to None, this will make save() to create a new row
+        instance.pk = None
+
+        instance.start_date = instance.end_date
+        instance.end_date = None
+
+        instance.created_at = None
+        instance.updated_at = None
+
+        # Update the new instance without saving
+        instance = self.update(instance, update_payload, save=False)
+
+        # Update the price
+        try:
+            price = self.get_price(self.get_price_dependency_from_instance(instance))
+            if price is None:
+                raise PriceNotFound()
+        except PriceNotFound:
+            if fallback_price:
+                price = PriceMixin()
+                price.hourly_price = Money(amount=0, currency=settings.DEFAULT_CURRENCY)
+                price.monthly_price = Money(amount=0, currency=settings.DEFAULT_CURRENCY)
+            else:
+                raise
+        instance.hourly_price = price.hourly_price
+        instance.monthly_price = price.monthly_price
+        instance.save()
+
+        return instance
+
+    def update(self, instance, update_payload, save=True):
+        """
+        Update instance
+        :param instance: instance that will be updated
+        :param update_payload: new data
+        :param save: will it be saved or not
+        :return:
+        """
+        for key, value in update_payload.items():
+            setattr(instance, key, value)
+
+        if save:
+            instance.save()
+
+        return instance
+
+    def update_and_close(self, instance, payload):
+        """
+        :param instance: Instance that will be closed
+        :param payload: update payload
+        :return:
+        """
+        self.update(instance, payload, save=False)
+        instance.close(timezone.now())  # Close will also save the instance
+
+    def is_informative_changed(self, instance, payload):
+        """
+        Check whether informative field in instance is changed compared to the payload
+        :param instance: the instance that will be checked
+        :param payload: payload to compare
+        :return:
+        """
+        for informative in self.INFORMATIVE_FIELDS:
+            if getattr(instance, informative) != payload[informative]:
+                return True
+
+        return False
+
+    def is_price_dependency_changed(self, instance, payload):
+        """
+        Check whether price dependency field in instance is changed compared to the payload
+        :param instance: the instance that will be checked
+        :param payload: payload to compare
+        :return:
+        """
+        for price_dependency in self.PRICE_DEPENDENCY_FIELDS:
+            if getattr(instance, price_dependency) != payload[price_dependency]:
+                return True
+
+        return False
+
+    def get_active_instance(self, invoice, payload):
+        """
+        Get currently active invoice component instance.
+        Filtered by invoice and key field in payload
+        :param invoice: Invoice target
+        :param payload: Payload to get key field, please make sure there are value for the key field inside the payload
+        :return:
+        """
+        kwargs = {"invoice": invoice, "end_date": None, self.KEY_FIELD: payload[self.KEY_FIELD]}
+        return self.INVOICE_CLASS.objects.filter(**kwargs).first()
+
+    def get_price_dependency_from_instance(self, instance):
+        """
+        Get payload with price dependency field extracted from instance
+        :param instance: Instance to extract the price dependency
+        :return:
+        """
+        return {field: getattr(instance, field) for field in self.PRICE_DEPENDENCY_FIELDS}
+
+    @abc.abstractmethod
+    def get_price(self, payload) -> PriceMixin:
+        """
+        Get price based on payload
+        :param payload: the payload that will contain filter to get the price
+        :return:
+        """
+        raise NotImplementedError()
--- a/core/component/component.py
+++ b/core/component/component.py
@ -0,0 +1,65 @@
+from core.component.image.event_handler import ImageEventHandler
+from core.component.image.invoice_handler import ImageInvoiceHandler
+from core.component.router.event_handler import RouterEventHandler
+from core.component.router.invoice_handler import RouterInvoiceHandler
+from core.component.snapshot.event_handler import SnapshotEventHandler
+from core.component.snapshot.invoice_handler import SnapshotInvoiceHandler
+from core.models import InvoiceInstance, InvoiceVolume, InvoiceFloatingIp, FlavorPrice, FloatingIpsPrice, VolumePrice, \
+    RouterPrice, SnapshotPrice, InvoiceRouter, InvoiceSnapshot, ImagePrice, InvoiceImage
+from core.component.floating_ips.event_handler import FloatingIpEventHandler
+from core.component.floating_ips.invoice_handler import FloatingIpInvoiceHandler
+from core.component.instances.event_handler import InstanceEventHandler
+from core.component.instances.invoice_handler import InstanceInvoiceHandler
+from core.component.labels import LABEL_INSTANCES, LABEL_VOLUMES, LABEL_FLOATING_IPS, LABEL_ROUTERS, LABEL_SNAPSHOTS, \
+    LABEL_IMAGES
+from core.component.volume.event_handler import VolumeEventHandler
+from core.component.volume.invoice_handler import VolumeInvoiceHandler
+
+"""
+Define a model that represent price for particular component
+"""
+PRICE_MODEL = {
+    "flavor": FlavorPrice,
+    "floating_ip": FloatingIpsPrice,
+    "volume": VolumePrice,
+    "router": RouterPrice,
+    "snapshot": SnapshotPrice,
+    "image": ImagePrice
+}
+
+"""
+Define a model that represent a component in invoice.
+The label that used for the key must be able to access through [Invoice] model
+"""
+INVOICE_COMPONENT_MODEL = {
+    LABEL_INSTANCES: InvoiceInstance,
+    LABEL_VOLUMES: InvoiceVolume,
+    LABEL_FLOATING_IPS: InvoiceFloatingIp,
+    LABEL_ROUTERS: InvoiceRouter,
+    LABEL_SNAPSHOTS: InvoiceSnapshot,
+    LABEL_IMAGES: InvoiceImage
+}
+
+"""
+Define a class that handle the event from message queue
+"""
+EVENT_HANDLER = {
+    LABEL_INSTANCES: InstanceEventHandler,
+    LABEL_VOLUMES: VolumeEventHandler,
+    LABEL_FLOATING_IPS: FloatingIpEventHandler,
+    LABEL_ROUTERS: RouterEventHandler,
+    LABEL_SNAPSHOTS: SnapshotEventHandler,
+    LABEL_IMAGES: ImageEventHandler
+}
+
+"""
+Define an instance that handle invoice creation or update
+"""
+INVOICE_HANDLER = {
+    LABEL_INSTANCES: InstanceInvoiceHandler(),
+    LABEL_VOLUMES: VolumeInvoiceHandler(),
+    LABEL_FLOATING_IPS: FloatingIpInvoiceHandler(),
+    LABEL_ROUTERS: RouterInvoiceHandler(),
+    LABEL_SNAPSHOTS: SnapshotInvoiceHandler(),
+    LABEL_IMAGES: ImageInvoiceHandler()
+}
--- a/core/component/floating_ips/event_handler.py
+++ b/core/component/floating_ips/event_handler.py
@ -0,0 +1,23 @@
+from core.component.base.event_handler import EventHandler
+from core.component.floating_ips.invoice_handler import FloatingIpInvoiceHandler
+
+
+class FloatingIpEventHandler(EventHandler):
+    def handle(self, event_type, raw_payload):
+        if event_type == 'floatingip.create.end':
+            tenant_id = raw_payload['floatingip']['tenant_id']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_create(invoice, event_type, raw_payload)
+
+        if event_type == 'floatingip.delete.end':
+            tenant_id = raw_payload['floatingip']['tenant_id']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_delete(invoice, event_type, raw_payload)
+
+    def clean_payload(self, event_type, raw_payload):
+        payload = {
+            "fip_id": raw_payload['floatingip']['id'],
+            "ip": raw_payload['floatingip']['floating_ip_address'],
+        }
+
+        return payload
--- a/core/component/floating_ips/invoice_handler.py
+++ b/core/component/floating_ips/invoice_handler.py
@ -0,0 +1,19 @@
+from core.exception import PriceNotFound
+from core.models import FloatingIpsPrice, InvoiceFloatingIp, PriceMixin
+from core.component.base.invoice_handler import InvoiceHandler
+
+
+class FloatingIpInvoiceHandler(InvoiceHandler):
+    INVOICE_CLASS = InvoiceFloatingIp
+    KEY_FIELD = "fip_id"
+    PRICE_DEPENDENCY_FIELDS = []
+    INFORMATIVE_FIELDS = ["ip"]
+
+    def get_price(self, payload) -> PriceMixin:
+        price = FloatingIpsPrice.objects.first()
+
+        if price is None:
+            raise PriceNotFound(identifier='floating ip')
+
+        return price
+
--- a/core/component/image/event_handler.py
+++ b/core/component/image/event_handler.py
@ -0,0 +1,28 @@
+from core.component.base.event_handler import EventHandler
+
+
+class ImageEventHandler(EventHandler):
+    def handle(self, event_type, raw_payload):
+        if event_type == 'image.activate':
+            tenant_id = raw_payload['owner']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_create(invoice, event_type, raw_payload)
+
+        if event_type == 'image.delete':
+            tenant_id = raw_payload['owner']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_delete(invoice, event_type, raw_payload)
+
+        if event_type == 'image.update':
+            tenant_id = raw_payload['owner']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_update(invoice, event_type, raw_payload)
+
+    def clean_payload(self, event_type, raw_payload):
+        payload = {
+            "image_id": raw_payload['id'],
+            "space_allocation_gb": raw_payload['size'] / 1024 / 1024 / 1024,
+            "name": raw_payload['name'] or raw_payload['id'],
+        }
+
+        return payload
--- a/core/component/image/invoice_handler.py
+++ b/core/component/image/invoice_handler.py
@ -0,0 +1,17 @@
+from core.component.base.invoice_handler import InvoiceHandler
+from core.exception import PriceNotFound
+from core.models import PriceMixin, InvoiceImage, ImagePrice
+
+
+class ImageInvoiceHandler(InvoiceHandler):
+    INVOICE_CLASS = InvoiceImage
+    KEY_FIELD = "image_id"
+    PRICE_DEPENDENCY_FIELDS = ["space_allocation_gb"]
+    INFORMATIVE_FIELDS = ["name"]
+
+    def get_price(self, payload) -> PriceMixin:
+        price = ImagePrice.objects.first()
+        if price is None:
+            raise PriceNotFound(identifier='image')
+
+        return price
--- a/core/component/instances/event_handler.py
+++ b/core/component/instances/event_handler.py
@ -0,0 +1,25 @@
+from core.component.base.event_handler import EventHandler
+
+
+class InstanceEventHandler(EventHandler):
+    def handle(self, event_type, raw_payload):
+        if event_type == 'compute.instance.update':
+            tenant_id = raw_payload['tenant_id']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+
+            is_updated = self.handle_update(invoice, event_type, raw_payload)
+
+            if not is_updated and raw_payload['state'] == 'active':
+                self.handle_create(invoice, event_type, raw_payload)
+
+            if not is_updated and raw_payload['state'] == 'deleted':
+                self.handle_delete(invoice, event_type, raw_payload)
+
+    def clean_payload(self, event_type, raw_payload):
+        payload = {
+            "instance_id": raw_payload['instance_id'],
+            "flavor_id": raw_payload['instance_flavor_id'],
+            "name": raw_payload['display_name'],
+        }
+
+        return payload
--- a/core/component/instances/invoice_handler.py
+++ b/core/component/instances/invoice_handler.py
@ -0,0 +1,18 @@
+from core.exception import PriceNotFound
+from core.models import FlavorPrice, InvoiceInstance, PriceMixin
+from core.component.base.invoice_handler import InvoiceHandler
+
+
+class InstanceInvoiceHandler(InvoiceHandler):
+    INVOICE_CLASS = InvoiceInstance
+    KEY_FIELD = "instance_id"
+    PRICE_DEPENDENCY_FIELDS = ['flavor_id']
+    INFORMATIVE_FIELDS = ['name']
+
+    def get_price(self, payload) -> PriceMixin:
+        price = FlavorPrice.objects.filter(flavor_id=payload['flavor_id']).first()
+
+        if price is None:
+            raise PriceNotFound(identifier='flavor')
+
+        return price
--- a/core/component/labels.py
+++ b/core/component/labels.py
@ -0,0 +1,9 @@
+LABEL_INSTANCES = "instances"
+LABEL_VOLUMES = "volumes"
+LABEL_FLOATING_IPS = "floating_ips"
+LABEL_ROUTERS = "routers"
+LABEL_SNAPSHOTS = "snapshots"
+LABEL_IMAGES = "images"
+
+INVOICE_COMPONENT_LABELS = [LABEL_INSTANCES, LABEL_VOLUMES, LABEL_FLOATING_IPS, LABEL_ROUTERS, LABEL_SNAPSHOTS,
+                            LABEL_IMAGES]
--- a/core/component/router/event_handler.py
+++ b/core/component/router/event_handler.py
@ -0,0 +1,43 @@
+from core.component.base.event_handler import EventHandler
+from core.component.floating_ips.invoice_handler import FloatingIpInvoiceHandler
+
+
+class RouterEventHandler(EventHandler):
+    def is_external_gateway_set(self, raw_payload):
+        return raw_payload['router']['external_gateway_info'] is not None
+
+    def handle(self, event_type, raw_payload):
+        # Case: Creating router with external gateway
+        if event_type == 'router.create.end' and self.is_external_gateway_set(raw_payload):
+            tenant_id = raw_payload['router']['tenant_id']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_create(invoice, event_type, raw_payload)
+
+        if event_type == 'router.update.end':
+            tenant_id = raw_payload['router']['tenant_id']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+
+            # Handel update for existing instance
+            self.handle_update(invoice, event_type, raw_payload)
+
+            # Case: Existing router set gateway
+            if self.is_external_gateway_set(raw_payload):
+                self.handle_create(invoice, event_type, raw_payload)
+
+            # Case: Existing router remove gateway
+            if not self.is_external_gateway_set(raw_payload):
+                self.handle_delete(invoice, event_type, raw_payload)
+
+        # Case: Delete router
+        if event_type == 'router.delete.end':
+            tenant_id = raw_payload['router']['tenant_id']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_delete(invoice, event_type, raw_payload)
+
+    def clean_payload(self, event_type, raw_payload):
+        payload = {
+            "router_id": raw_payload['router']['id'],
+            "name": raw_payload['router']['name'],
+        }
+
+        return payload
--- a/core/component/router/invoice_handler.py
+++ b/core/component/router/invoice_handler.py
@ -0,0 +1,17 @@
+from core.component.base.invoice_handler import InvoiceHandler
+from core.exception import PriceNotFound
+from core.models import PriceMixin, InvoiceRouter, RouterPrice
+
+
+class RouterInvoiceHandler(InvoiceHandler):
+    INVOICE_CLASS = InvoiceRouter
+    KEY_FIELD = "router_id"
+    PRICE_DEPENDENCY_FIELDS = []
+    INFORMATIVE_FIELDS = ["name"]
+
+    def get_price(self, payload) -> PriceMixin:
+        price = RouterPrice.objects.first()
+        if price is None:
+            raise PriceNotFound(identifier='router')
+
+        return price
--- a/core/component/snapshot/event_handler.py
+++ b/core/component/snapshot/event_handler.py
@ -0,0 +1,29 @@
+from core.component.base.event_handler import EventHandler
+from core.component.floating_ips.invoice_handler import FloatingIpInvoiceHandler
+
+
+class SnapshotEventHandler(EventHandler):
+    def handle(self, event_type, raw_payload):
+        if event_type == 'snapshot.create.end':
+            tenant_id = raw_payload['tenant_id']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_create(invoice, event_type, raw_payload)
+
+        if event_type == 'snapshot.delete.end':
+            tenant_id = raw_payload['tenant_id']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_delete(invoice, event_type, raw_payload)
+
+        if event_type == 'snapshot.update.end':
+            tenant_id = raw_payload['tenant_id']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_update(invoice, event_type, raw_payload)
+
+    def clean_payload(self, event_type, raw_payload):
+        payload = {
+            "snapshot_id": raw_payload['snapshot_id'],
+            "space_allocation_gb": raw_payload['volume_size'],
+            "name": raw_payload['display_name'],
+        }
+
+        return payload
--- a/core/component/snapshot/invoice_handler.py
+++ b/core/component/snapshot/invoice_handler.py
@ -0,0 +1,17 @@
+from core.component.base.invoice_handler import InvoiceHandler
+from core.exception import PriceNotFound
+from core.models import PriceMixin, InvoiceSnapshot, SnapshotPrice
+
+
+class SnapshotInvoiceHandler(InvoiceHandler):
+    INVOICE_CLASS = InvoiceSnapshot
+    KEY_FIELD = "snapshot_id"
+    PRICE_DEPENDENCY_FIELDS = ["space_allocation_gb"]
+    INFORMATIVE_FIELDS = ["name"]
+
+    def get_price(self, payload) -> PriceMixin:
+        price = SnapshotPrice.objects.first()
+        if price is None:
+            raise PriceNotFound(identifier='snapshot')
+
+        return price
--- a/core/component/volume/event_handler.py
+++ b/core/component/volume/event_handler.py
@ -0,0 +1,29 @@
+from core.component.base.event_handler import EventHandler
+
+
+class VolumeEventHandler(EventHandler):
+    def handle(self, event_type, raw_payload):
+        if event_type == 'volume.create.end':
+            tenant_id = raw_payload['tenant_id']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_create(invoice, event_type, raw_payload)
+
+        if event_type == 'volume.delete.end':
+            tenant_id = raw_payload['tenant_id']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_delete(invoice, event_type, raw_payload)
+
+        if event_type in ['volume.resize.end', 'volume.update.end', 'volume.retype']:
+            tenant_id = raw_payload['tenant_id']
+            invoice = self.get_tenant_progress_invoice(tenant_id)
+            self.handle_update(invoice, event_type, raw_payload)
+
+    def clean_payload(self, event_type, raw_payload):
+        payload = {
+            "volume_id": raw_payload['volume_id'],
+            "volume_type_id": raw_payload['volume_type'],
+            "volume_name": raw_payload['display_name'] or raw_payload['volume_id'],
+            "space_allocation_gb": raw_payload['size'],
+        }
+
+        return payload
--- a/core/component/volume/invoice_handler.py
+++ b/core/component/volume/invoice_handler.py
@ -0,0 +1,18 @@
+from core.exception import PriceNotFound
+from core.models import VolumePrice, InvoiceVolume, PriceMixin
+from core.component.base.invoice_handler import InvoiceHandler
+
+
+class VolumeInvoiceHandler(InvoiceHandler):
+    INVOICE_CLASS = InvoiceVolume
+    KEY_FIELD = "volume_id"
+    PRICE_DEPENDENCY_FIELDS = ['volume_type_id', 'space_allocation_gb']
+    INFORMATIVE_FIELDS = ['volume_name']
+
+    def get_price(self, payload) -> PriceMixin:
+        price = VolumePrice.objects.filter(volume_type_id=payload['volume_type_id']).first()
+
+        if price is None:
+            raise PriceNotFound(identifier='volume')
+
+        return price
--- a/core/event_endpoint.py
+++ b/core/event_endpoint.py
@ -0,0 +1,29 @@
+import logging
+
+from oslo_messaging import NotificationResult
+
+from core.component import component
+from core.utils.dynamic_setting import get_dynamic_settings, BILLING_ENABLED, get_dynamic_setting
+
+LOG = logging.getLogger("yuyu_notification")
+
+
+class EventEndpoint(object):
+    def __init__(self):
+        self.event_handler = [
+            cls(component.INVOICE_HANDLER[label]) for label, cls in component.EVENT_HANDLER.items()
+        ]
+
+    def info(self, ctxt, publisher_id, event_type, payload, metadata):
+        LOG.info("=== Event Received ===")
+        LOG.info("Event Type: " + str(event_type))
+        LOG.info("Payload: " + str(payload))
+
+        if not get_dynamic_setting(BILLING_ENABLED):
+            return NotificationResult.HANDLED
+
+        # TODO: Error Handling
+        for handler in self.event_handler:
+            handler.handle(event_type, payload)
+
+        return NotificationResult.HANDLED
--- a/core/exception.py
+++ b/core/exception.py
@ -0,0 +1,3 @@
+class PriceNotFound(Exception):
+    def __init__(self, identifier=None):
+        self.identifier = identifier
--- a/core/management/init.py
+++ b/core/management/init.py
--- a/core/management/commands/init.py
+++ b/core/management/commands/init.py
--- a/core/management/commands/event_monitor.py
+++ b/core/management/commands/event_monitor.py
@ -0,0 +1,71 @@
+from django.conf import settings
+import logging
+import os
+import signal
+import time
+
+from oslo_config import cfg
+import oslo_messaging as messaging
+from oslo_messaging import notify  # noqa
+
+from django.core.management.base import BaseCommand
+
+from core.event_endpoint import EventEndpoint
+
+LOG = logging.getLogger("yuyu_notification")
+
+
+class SignalExit(SystemExit):
+    def __init__(self, signo, exccode=1):
+        super(SignalExit, self).__init__(exccode)
+        self.signo = signo
+
+
+class Command(BaseCommand):
+    help = 'Start Yuyu Event Monitor'
+
+    def signal_handler(self, signum, frame):
+        raise SignalExit(signum)
+
+    def run_server(self, transport, server):
+        try:
+            server.start()
+            server.wait()
+            LOG.info('The server is terminating')
+            time.sleep(1)
+        except SignalExit as e:
+            LOG.info('Signal %s is caught. Interrupting the execution',
+                     e.signo)
+            server.stop()
+            server.wait()
+        finally:
+            transport.cleanup()
+
+    def notify_server(self, transport, topics):
+        endpoints = [EventEndpoint()]
+        targets = list(map(lambda t: messaging.Target(topic=t), topics))
+        server = notify.get_notification_listener(
+            transport,
+            targets,
+            endpoints,
+            executor='threading'
+        )
+        self.run_server(transport, server)
+
+    def handle(self, *args, **options):
+        url = settings.YUYU_NOTIFICATION_URL
+        transport = messaging.get_notification_transport(cfg.CONF,
+                                                         url=url)
+
+        # oslo.config defaults
+        cfg.CONF.heartbeat_interval = 5
+        cfg.CONF.prog = os.path.basename(__file__)
+        cfg.CONF.project = 'yuyu'
+
+        signal.signal(signal.SIGTERM, self.signal_handler)
+        signal.signal(signal.SIGINT, self.signal_handler)
+
+        self.notify_server(
+            transport=transport,
+            topics=settings.YUYU_NOTIFICATION_TOPICS,
+        )
--- a/core/management/commands/process_invoice.py
+++ b/core/management/commands/process_invoice.py
@ -0,0 +1,57 @@
+import logging
+from typing import Mapping, Dict, Iterable
+
+from django.core.management import BaseCommand
+from django.utils import timezone
+
+from core.models import Invoice, InvoiceComponentMixin
+from core.component import component, labels
+from core.utils.dynamic_setting import get_dynamic_setting, BILLING_ENABLED, INVOICE_TAX
+
+LOG = logging.getLogger("yuyu_new_invoice")
+
+
+class Command(BaseCommand):
+    help = 'Yuyu New Invoice'
+
+    def handle(self, *args, **options):
+        print("Processing Invoice")
+        if not get_dynamic_setting(BILLING_ENABLED):
+            return
+
+        self.close_date = timezone.now()
+        self.tax_pertentage = get_dynamic_setting(INVOICE_TAX)
+
+        active_invoices = Invoice.objects.filter(state=Invoice.InvoiceState.IN_PROGRESS).all()
+        for active_invoice in active_invoices:
+            self.close_active_invoice(active_invoice)
+        print("Processing Done")
+
+    def close_active_invoice(self, active_invoice: Invoice):
+        active_components_map: Dict[str, Iterable[InvoiceComponentMixin]] = {}
+
+        for label in labels.INVOICE_COMPONENT_LABELS:
+            active_components_map[label] = getattr(active_invoice, label).filter(end_date=None).all()
+
+            # Close Invoice Component
+            for active_component in active_components_map[label]:
+                active_component.close(self.close_date)
+
+        # Finish current invoice
+        active_invoice.close(self.close_date, self.tax_pertentage)
+
+        # Creating new Invoice
+        new_invoice = Invoice.objects.create(
+            project=active_invoice.project,
+            start_date=self.close_date,
+            state=Invoice.InvoiceState.IN_PROGRESS
+        )
+        new_invoice.save()
+
+        # Cloning active component to continue in next invoice
+        for label, active_components in active_components_map.items():
+            handler = component.INVOICE_HANDLER[label]
+            for active_component in active_components:
+                handler.roll(active_component, self.close_date, update_payload={
+                    "invoice": new_invoice
+                }, fallback_price=True)
--- a/core/migrations/0001_initial.py
+++ b/core/migrations/0001_initial.py
@ -0,0 +1,157 @@
+# Generated by Django 3.2.6 on 2021-10-10 13:08
+
+from django.db import migrations, models
+import django.db.models.deletion
+import djmoney.models.fields
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='BillingProject',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('tenant_id', models.CharField(max_length=256)),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='FlavorPrice',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('hourly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('hourly_price', djmoney.models.fields.MoneyField(decimal_places=0, max_digits=10)),
+                ('monthly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('monthly_price', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+                ('flavor_id', models.CharField(max_length=256)),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='FloatingIpsPrice',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('hourly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('hourly_price', djmoney.models.fields.MoneyField(decimal_places=0, max_digits=10)),
+                ('monthly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('monthly_price', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='Invoice',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('start_date', models.DateTimeField()),
+                ('end_date', models.DateTimeField(blank=True, default=None, null=True)),
+                ('state', models.IntegerField(choices=[(1, 'In Progress'), (100, 'Finished')])),
+                ('tax_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('tax', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+                ('total_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('total', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+                ('project', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='core.billingproject')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='VolumePrice',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('hourly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('hourly_price', djmoney.models.fields.MoneyField(decimal_places=0, max_digits=10)),
+                ('monthly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('monthly_price', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+                ('volume_type_id', models.CharField(max_length=256)),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='InvoiceVolume',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('hourly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('hourly_price', djmoney.models.fields.MoneyField(decimal_places=0, max_digits=10)),
+                ('monthly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('monthly_price', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+                ('start_date', models.DateTimeField()),
+                ('end_date', models.DateTimeField(blank=True, default=None, null=True)),
+                ('volume_id', models.CharField(max_length=256)),
+                ('volume_type_id', models.CharField(max_length=256)),
+                ('space_allocation_gb', models.IntegerField()),
+                ('volume_name', models.CharField(max_length=256)),
+                ('invoice', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='volumes', to='core.invoice')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='InvoiceInstance',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('hourly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('hourly_price', djmoney.models.fields.MoneyField(decimal_places=0, max_digits=10)),
+                ('monthly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('monthly_price', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+                ('start_date', models.DateTimeField()),
+                ('end_date', models.DateTimeField(blank=True, default=None, null=True)),
+                ('instance_id', models.CharField(max_length=266)),
+                ('flavor_id', models.CharField(max_length=256)),
+                ('name', models.CharField(max_length=256)),
+                ('invoice', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='instances', to='core.invoice')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='InvoiceFloatingIp',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('hourly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('hourly_price', djmoney.models.fields.MoneyField(decimal_places=0, max_digits=10)),
+                ('monthly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('monthly_price', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+                ('start_date', models.DateTimeField()),
+                ('end_date', models.DateTimeField(blank=True, default=None, null=True)),
+                ('fip_id', models.CharField(max_length=266)),
+                ('ip', models.CharField(max_length=256)),
+                ('invoice', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='floating_ips', to='core.invoice')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]
--- a/core/migrations/0002_dynamicsetting.py
+++ b/core/migrations/0002_dynamicsetting.py
@ -0,0 +1,25 @@
+# Generated by Django 3.2.6 on 2021-10-13 16:38
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='DynamicSetting',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('key', models.CharField(db_index=True, max_length=256, unique=True)),
+                ('value', models.TextField()),
+                ('type', models.IntegerField(choices=[(1, 'Boolean'), (2, 'Int'), (3, 'Str'), (4, 'Json')])),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]
--- a/core/migrations/0003_alter_invoicevolume_space_allocation_gb.py
+++ b/core/migrations/0003_alter_invoicevolume_space_allocation_gb.py
@ -0,0 +1,18 @@
+# Generated by Django 3.2.6 on 2021-10-13 17:55
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0002_dynamicsetting'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='invoicevolume',
+            name='space_allocation_gb',
+            field=models.FloatField(),
+        ),
+    ]
--- a/core/migrations/0004_invoicerouter_invoicesnapshot_routerprice_snapshotprice.py
+++ b/core/migrations/0004_invoicerouter_invoicesnapshot_routerprice_snapshotprice.py
@ -0,0 +1,86 @@
+# Generated by Django 3.2.6 on 2021-10-14 05:47
+
+from django.db import migrations, models
+import django.db.models.deletion
+import djmoney.models.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0003_alter_invoicevolume_space_allocation_gb'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='RouterPrice',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('hourly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('hourly_price', djmoney.models.fields.MoneyField(decimal_places=0, max_digits=10)),
+                ('monthly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('monthly_price', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='SnapshotPrice',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('hourly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('hourly_price', djmoney.models.fields.MoneyField(decimal_places=0, max_digits=10)),
+                ('monthly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('monthly_price', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='InvoiceSnapshot',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('hourly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('hourly_price', djmoney.models.fields.MoneyField(decimal_places=0, max_digits=10)),
+                ('monthly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('monthly_price', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+                ('start_date', models.DateTimeField()),
+                ('end_date', models.DateTimeField(blank=True, default=None, null=True)),
+                ('snapshot_id', models.CharField(max_length=256)),
+                ('space_allocation_gb', models.FloatField()),
+                ('name', models.CharField(max_length=256)),
+                ('invoice', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='snapshots', to='core.invoice')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='InvoiceRouter',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('hourly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('hourly_price', djmoney.models.fields.MoneyField(decimal_places=0, max_digits=10)),
+                ('monthly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('monthly_price', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+                ('start_date', models.DateTimeField()),
+                ('end_date', models.DateTimeField(blank=True, default=None, null=True)),
+                ('router_id', models.CharField(max_length=256)),
+                ('name', models.CharField(max_length=256)),
+                ('invoice', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='routers', to='core.invoice')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]
--- a/core/migrations/0005_imageprice_invoiceimage.py
+++ b/core/migrations/0005_imageprice_invoiceimage.py
@ -0,0 +1,51 @@
+# Generated by Django 3.2.6 on 2021-10-29 04:22
+
+from django.db import migrations, models
+import django.db.models.deletion
+import djmoney.models.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0004_invoicerouter_invoicesnapshot_routerprice_snapshotprice'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ImagePrice',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('hourly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('hourly_price', djmoney.models.fields.MoneyField(decimal_places=0, max_digits=10)),
+                ('monthly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('monthly_price', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='InvoiceImage',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('hourly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('hourly_price', djmoney.models.fields.MoneyField(decimal_places=0, max_digits=10)),
+                ('monthly_price_currency', djmoney.models.fields.CurrencyField(choices=[('IDR', 'Indonesian Rupiah'), ('USD', 'US Dollar')], default='IDR', editable=False, max_length=3)),
+                ('monthly_price', djmoney.models.fields.MoneyField(blank=True, decimal_places=0, default=None, max_digits=10, null=True)),
+                ('start_date', models.DateTimeField()),
+                ('end_date', models.DateTimeField(blank=True, default=None, null=True)),
+                ('image_id', models.CharField(max_length=256)),
+                ('space_allocation_gb', models.FloatField()),
+                ('name', models.CharField(max_length=256)),
+                ('invoice', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='images', to='core.invoice')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]
--- a/core/migrations/0006_alter_invoice_state.py
+++ b/core/migrations/0006_alter_invoice_state.py
@ -0,0 +1,18 @@
+# Generated by Django 3.2.6 on 2022-02-13 18:51
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0005_imageprice_invoiceimage'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='invoice',
+            name='state',
+            field=models.IntegerField(choices=[(1, 'In Progress'), (2, 'Unpaid'), (100, 'Finished')]),
+        ),
+    ]
--- a/core/migrations/0007_invoice_finish_date.py
+++ b/core/migrations/0007_invoice_finish_date.py
@ -0,0 +1,18 @@
+# Generated by Django 3.2.6 on 2022-02-13 18:59
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0006_alter_invoice_state'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='invoice',
+            name='finish_date',
+            field=models.DateTimeField(blank=True, default=None, null=True),
+        ),
+    ]
--- a/core/migrations/init.py
+++ b/core/migrations/init.py
--- a/core/models.py
+++ b/core/models.py
@ -0,0 +1,206 @@
+import math
+
+from django.conf import settings
+from django.db import models
+from django.utils import timezone
+from djmoney.models.fields import MoneyField
+from djmoney.money import Money
+
+from core.component import labels
+from core.utils.model_utils import BaseModel, TimestampMixin, PriceMixin, InvoiceComponentMixin
+
+
+# region Dynamic Setting
+class DynamicSetting(BaseModel):
+    class DataType(models.IntegerChoices):
+        BOOLEAN = 1
+        INT = 2
+        STR = 3
+        JSON = 4
+
+    key = models.CharField(max_length=256, unique=True, db_index=True)
+    value = models.TextField()
+    type = models.IntegerField(choices=DataType.choices)
+
+
+# end region
+
+# region Pricing
+class FlavorPrice(BaseModel, TimestampMixin, PriceMixin):
+    flavor_id = models.CharField(max_length=256)
+
+
+class FloatingIpsPrice(BaseModel, TimestampMixin, PriceMixin):
+    # No need for any additional field
+    pass
+
+
+class VolumePrice(BaseModel, TimestampMixin, PriceMixin):
+    volume_type_id = models.CharField(max_length=256)
+
+
+class RouterPrice(BaseModel, TimestampMixin, PriceMixin):
+    # No need for any additional field
+    pass
+
+
+class SnapshotPrice(BaseModel, TimestampMixin, PriceMixin):
+    # No need for any additional field
+    pass
+
+
+class ImagePrice(BaseModel, TimestampMixin, PriceMixin):
+    # No need for any additional field
+    pass
+
+
+# end region
+
+# region Invoicing
+class BillingProject(BaseModel, TimestampMixin):
+    tenant_id = models.CharField(max_length=256)
+
+    def __str__(self):
+        return self.tenant_id
+
+
+class Invoice(BaseModel, TimestampMixin):
+    class InvoiceState(models.IntegerChoices):
+        IN_PROGRESS = 1
+        UNPAID = 2
+        FINISHED = 100
+
+    project = models.ForeignKey('BillingProject', on_delete=models.CASCADE)
+    start_date = models.DateTimeField()
+    end_date = models.DateTimeField(default=None, blank=True, null=True)
+    finish_date = models.DateTimeField(default=None, blank=True, null=True)
+    state = models.IntegerField(choices=InvoiceState.choices)
+    tax = MoneyField(max_digits=10, decimal_places=0, default=None, blank=True, null=True)
+    total = MoneyField(max_digits=10, decimal_places=0, default=None, blank=True, null=True)
+
+    @property
+    def subtotal(self):
+        # Need to optimize?
+        # currently price is calculated on the fly, maybe need to save to db to make performance faster?
+        # or using cache?
+
+        price = 0
+        for component_relation_label in labels.INVOICE_COMPONENT_LABELS:
+            relation_all_row = getattr(self, component_relation_label).all()
+            price += sum(map(lambda x: x.price_charged, relation_all_row))
+
+        if price == 0:
+            return Money(amount=price, currency=settings.DEFAULT_CURRENCY)
+
+        return price
+
+    @property
+    def total_resource(self):
+        total = 0
+        for component_relation_label in labels.INVOICE_COMPONENT_LABELS:
+            total += getattr(self, component_relation_label).count()
+
+        return total
+
+    def close(self, date, tax_percentage):
+        self.state = Invoice.InvoiceState.UNPAID
+        self.end_date = date
+        self.tax = tax_percentage * self.subtotal / 100
+        self.total = self.tax + self.subtotal
+        self.save()
+
+    def finish(self):
+        self.state = Invoice.InvoiceState.FINISHED
+        self.finish_date = timezone.now()
+        self.save()
+
+    def rollback_to_unpaid(self):
+        self.state = Invoice.InvoiceState.UNPAID
+        self.finish_date = None
+        self.save()
+
+
+# end region
+
+# region Invoice Component
+class InvoiceInstance(BaseModel, InvoiceComponentMixin):
+    invoice = models.ForeignKey('Invoice', on_delete=models.CASCADE, related_name=labels.LABEL_INSTANCES)
+    # Key
+    instance_id = models.CharField(max_length=266)
+
+    # Price Dependency
+    flavor_id = models.CharField(max_length=256)
+
+    # Informative
+    name = models.CharField(max_length=256)
+
+
+class InvoiceFloatingIp(BaseModel, InvoiceComponentMixin):
+    invoice = models.ForeignKey('Invoice', on_delete=models.CASCADE, related_name=labels.LABEL_FLOATING_IPS)
+    # Key
+    fip_id = models.CharField(max_length=266)
+
+    # Informative
+    ip = models.CharField(max_length=256)
+
+
+class InvoiceVolume(BaseModel, InvoiceComponentMixin):
+    invoice = models.ForeignKey('Invoice', on_delete=models.CASCADE, related_name=labels.LABEL_VOLUMES)
+    # Key
+    volume_id = models.CharField(max_length=256)
+
+    # Price Dependency
+    volume_type_id = models.CharField(max_length=256)
+    space_allocation_gb = models.FloatField()
+
+    # Informative
+    volume_name = models.CharField(max_length=256)
+
+    @property
+    def price_charged(self):
+        price_without_allocation = super().price_charged
+        return price_without_allocation * math.ceil(self.space_allocation_gb)
+
+
+class InvoiceRouter(BaseModel, InvoiceComponentMixin):
+    invoice = models.ForeignKey('Invoice', on_delete=models.CASCADE, related_name=labels.LABEL_ROUTERS)
+    # Key
+    router_id = models.CharField(max_length=256)
+
+    # Informative
+    name = models.CharField(max_length=256)
+
+
+class InvoiceSnapshot(BaseModel, InvoiceComponentMixin):
+    invoice = models.ForeignKey('Invoice', on_delete=models.CASCADE, related_name=labels.LABEL_SNAPSHOTS)
+    # Key
+    snapshot_id = models.CharField(max_length=256)
+
+    # Price Dependency
+    space_allocation_gb = models.FloatField()
+
+    # Informative
+    name = models.CharField(max_length=256)
+
+    @property
+    def price_charged(self):
+        price_without_allocation = super().price_charged
+        return price_without_allocation * math.ceil(self.space_allocation_gb)
+
+
+class InvoiceImage(BaseModel, InvoiceComponentMixin):
+    invoice = models.ForeignKey('Invoice', on_delete=models.CASCADE, related_name=labels.LABEL_IMAGES)
+    # Key
+    image_id = models.CharField(max_length=256)
+
+    # Price Dependency
+    space_allocation_gb = models.FloatField()
+
+    # Informative
+    name = models.CharField(max_length=256)
+
+    @property
+    def price_charged(self):
+        price_without_allocation = super().price_charged
+        return price_without_allocation * math.ceil(self.space_allocation_gb)
+# end region
--- a/core/utils/init.py
+++ b/core/utils/init.py
--- a/core/utils/dynamic_setting.py
+++ b/core/utils/dynamic_setting.py
@ -0,0 +1,63 @@
+import json
+
+from core.models import DynamicSetting
+
+BILLING_ENABLED = "billing_enabled"
+INVOICE_TAX = "invoice_tax"
+
+DEFAULTS = {
+    BILLING_ENABLED: False,
+    INVOICE_TAX: 11
+}
+
+
+def _get_casted_value(setting: DynamicSetting):
+    if setting.type == DynamicSetting.DataType.JSON:
+        return json.loads(setting.value)
+    elif setting.type == DynamicSetting.DataType.BOOLEAN:
+        return setting.value == "1"
+    elif setting.type == DynamicSetting.DataType.INT:
+        return int(setting.value)
+    elif setting.type == DynamicSetting.DataType.STR:
+        return setting.value
+    else:
+        raise ValueError("Type not supported")
+
+
+def get_dynamic_settings():
+    result = DEFAULTS.copy()
+    settings = DynamicSetting.objects.all()
+    for setting in settings:
+        result[setting.key] = _get_casted_value(setting)
+
+    return result
+
+
+def get_dynamic_setting(key):
+    setting: DynamicSetting = DynamicSetting.objects.filter(key=key).first()
+    if not setting:
+        return DEFAULTS[key]
+
+    return setting.value
+
+
+def set_dynamic_setting(key, value):
+    if type(value) is dict:
+        inserted_value = json.dumps(value)
+        data_type = DynamicSetting.DataType.JSON
+    elif type(value) is bool:
+        inserted_value = "1" if value else "0"
+        data_type = DynamicSetting.DataType.BOOLEAN
+    elif type(value) is int:
+        inserted_value = str(value)
+        data_type = DynamicSetting.DataType.INT
+    elif type(value) is str:
+        inserted_value = value
+        data_type = DynamicSetting.DataType.STR
+    else:
+        raise ValueError("Type not supported")
+
+    DynamicSetting.objects.update_or_create(key=key, defaults={
+        "value": inserted_value,
+        "type": data_type
+    })
--- a/core/utils/model_utils.py
+++ b/core/utils/model_utils.py
@ -0,0 +1,88 @@
+import math
+
+from django.db import models
+from django.utils import timezone
+from djmoney.models.fields import MoneyField
+
+
+class BaseModel(models.Model):
+    class Meta:
+        abstract = True
+
+
+class TimestampMixin(models.Model):
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        abstract = True
+
+
+class PriceMixin(models.Model):
+    hourly_price = MoneyField(max_digits=10, decimal_places=0)
+    monthly_price = MoneyField(max_digits=10, decimal_places=0, default=None, blank=True, null=True)
+
+    class Meta:
+        abstract = True
+
+
+class InvoiceComponentMixin(TimestampMixin, PriceMixin):
+    """
+    Storing start time for price calculation
+    """
+    start_date = models.DateTimeField()
+
+    """
+    Storing end time of the component, when component still active it will be None.
+    It will be set when component is closed or rolled
+    """
+    end_date = models.DateTimeField(default=None, blank=True, null=True)
+
+    @property
+    def adjusted_end_date(self):
+        """
+        Get end date that will be used for calculation. Please use this for calculation and displaying usage duration
+        Basically it just return current time if end_date is None
+        end_date will be set when invoice is finished every end of the month or when invoice component is rolled
+        """
+        current_date = timezone.now()
+        if self.end_date:
+            end_date = self.end_date
+        else:
+            end_date = current_date
+
+        return end_date
+
+    @property
+    def price_charged(self):
+        """
+        Calculate the price to be charged to user
+        """
+        end_date = self.adjusted_end_date
+        if self.start_date.date().day == 1 and end_date.date().day == 1 \
+                and self.start_date.date().month != end_date.date().month \
+                and self.monthly_price:
+            # Using monthly price
+            return self.monthly_price
+
+        seconds_passes = (end_date - self.start_date).total_seconds()
+        hour_passes = math.ceil(seconds_passes / 3600)
+
+        return self.hourly_price * hour_passes
+
+    def is_closed(self):
+        """
+        Is component closed
+        """
+        return self.end_date is not None
+
+    def close(self, date):
+        """
+        Close component the component
+        """
+        self.end_date = date
+        self.save()
+
+    class Meta:
+        abstract = True
+
--- a/manage.py
+++ b/manage.py
@ -0,0 +1,22 @@
+#!/usr/bin/env python
+"""Django's command-line utility for administrative tasks."""
+import os
+import sys
+
+
+def main():
+    """Run administrative tasks."""
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'yuyu.settings')
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == '__main__':
+    main()
--- a/requirements.txt
+++ b/requirements.txt
@ -0,0 +1,11 @@
+asgiref==3.4.1
+Django==3.2.6
+pytz==2021.1
+sqlparse==0.4.1
+oslo.messaging>=12.8.0
+django-money==2.0.1
+openstacksdk==0.58.0
+djangorestframework==3.12.4
+django-filter==2.4.0
+Markdown==3.3.4
+gunicorn==20.1.0
--- a/script/yuyu_api.service
+++ b/script/yuyu_api.service
@ -0,0 +1,12 @@
+[Unit]
+Description=yuyu api daemon
+After=network.target
+
+[Service]
+User=root
+Group=root
+WorkingDirectory={{yuyu_dir}}
+ExecStart={{yuyu_dir}}/env/bin/gunicorn yuyu.wsgi --workers 2 --bind 127.0.0.1:8182 --log-file=logs/gunicorn.log
+
+[Install]
+WantedBy=multi-user.target
--- a/script/yuyu_event_monitor.service
+++ b/script/yuyu_event_monitor.service
@ -0,0 +1,12 @@
+[Unit]
+Description=yuyu event monitor daemon
+After=network.target
+
+[Service]
+User=root
+Group=root
+WorkingDirectory={{yuyu_dir}}
+ExecStart={{yuyu_dir}}/env/bin/python manage.py event_monitor
+
+[Install]
+WantedBy=multi-user.target
--- a/yuyu/init.py
+++ b/yuyu/init.py
--- a/yuyu/asgi.py
+++ b/yuyu/asgi.py
@ -0,0 +1,16 @@
+"""
+ASGI config for yuyu project.
+
+It exposes the ASGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/3.2/howto/deployment/asgi/
+"""
+
+import os
+
+from django.core.asgi import get_asgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'yuyu.settings')
+
+application = get_asgi_application()
--- a/yuyu/local_settings.py.sample
+++ b/yuyu/local_settings.py.sample
@ -0,0 +1,7 @@
+YUYU_NOTIFICATION_URL = "rabbit://openstack:password@127.0.0.1:5672/"
+YUYU_NOTIFICATION_TOPICS = ["notifications"]
+
+# Currency Configuration
+CURRENCIES = ('IDR', 'USD')
+DEFAULT_CURRENCY = "IDR"
+
--- a/yuyu/settings.py
+++ b/yuyu/settings.py
@ -0,0 +1,150 @@
+"""
+Django settings for yuyu project.
+
+Generated by 'django-admin startproject' using Django 3.2.6.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/3.2/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/3.2/ref/settings/
+"""
+
+from pathlib import Path
+
+# Build paths inside the project like this: BASE_DIR / 'subdir'.
+BASE_DIR = Path(__file__).resolve().parent.parent
+
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = 'django-insecure-kt=8eo4p*(5uq4jj^=)l8_4-_&44(#9xp!m0+^+csdok=(@ug3'
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True
+
+ALLOWED_HOSTS = []
+
+
+# Application definition
+
+INSTALLED_APPS = [
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+    'djmoney',
+    'rest_framework',
+    'core',
+    'api',
+]
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+]
+
+ROOT_URLCONF = 'yuyu.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [BASE_DIR / 'templates']
+        ,
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'yuyu.wsgi.application'
+
+
+# Database
+# https://docs.djangoproject.com/en/3.2/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': BASE_DIR / 'db.sqlite3',
+    }
+}
+
+
+# Password validation
+# https://docs.djangoproject.com/en/3.2/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+]
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/3.2/topics/i18n/
+
+LANGUAGE_CODE = 'en-us'
+
+TIME_ZONE = 'UTC'
+
+USE_I18N = True
+
+USE_L10N = True
+
+USE_TZ = True
+
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/3.2/howto/static-files/
+
+STATIC_URL = '/static/'
+
+# Default primary key field type
+# https://docs.djangoproject.com/en/3.2/ref/settings/#default-auto-field
+
+DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
+
+# Logging
+LOGGING = {
+    'version': 1,
+    'disable_existing_loggers': False,
+    'handlers': {
+        'console': {
+            'class': 'logging.StreamHandler',
+        },
+    },
+    'root': {
+        'handlers': ['console'],
+        'level': 'INFO',
+    },
+}
+
+try:
+    from .local_settings import *
+except ImportError:
+    pass
--- a/yuyu/urls.py
+++ b/yuyu/urls.py
@ -0,0 +1,22 @@
+"""yuyu URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/3.2/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  path('', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.urls import include, path
+    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
+"""
+from django.contrib import admin
+from django.urls import path, include
+
+urlpatterns = [
+    path('admin/', admin.site.urls),
+    path('api/', include('api.urls'))
+]
--- a/yuyu/wsgi.py
+++ b/yuyu/wsgi.py
@ -0,0 +1,16 @@
+"""
+WSGI config for yuyu project.
+
+It exposes the WSGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/3.2/howto/deployment/wsgi/
+"""
+
+import os
+
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'yuyu.settings')
+
+application = get_wsgi_application()