TODO Intro Design concepts Architecture Example RPCs RDBMS model Billing logic Discussions 2
Intro What to expect from Dough Keep track of billing info to charge tenants Flexible customization of payment policies How much/often to charge for resource unit Handles prepaid or pay-as-you-go What Dough does not do Keep track of tenant’s resource usage Needs a monitoring/metering system Deduct money from account DIY using database as a queue 3
Design concepts Highly configurable Billing frequency, unit of measure Asynchronous All events are asynchronous Independent Pluggable clients to access other projects Scalability Handle billing of many users Nova conventions Message protocol 4
Example: creating an instance Compute Network RDBMS Dashboard Storage Retrieve expired subscriptions 2 Collector 1 Request for Monitoring charge Farmer API daemon (Metering) Dispatch jobs Collector Check status / Retrieve usage / Create purchases 8
Example: creating an instance Compute Network RDBMS Dashboard Check instance Storage status 5 3 Create purchase record / Update subscription Collector status and expiring 4 datetime Retrieve instance Monitoring usage quantity Farmer API daemon (Metering) Collector 9
Example: creating an instance Compute Network RDBMS 2 Dashboard Storage RDBMS model 1 Collector RPCs Monitoring Farmer API daemon (Metering) Collector 3 Billing logic 10
RPCs subscribe_item Creates a subscription of a product Subscription status: ”creating” unsubscribe_item Updates the status of a subscription Subscription status: ”deleting” query_payment_types query_product_price query_usage_report 11
RDBMS model Created by... Regions → region name Items → resource name ItemTypes → resource type name Admin PaymentTypes → name, interval_unit, interval_size, is_prepaid Products region, item, item_type, payment_type order_unit, order_size, price, currency Subscriptions → product, tenant, status User expires_at, resource_uuid Purchases → subscription, quantity, Collector line_total 12
Billing logic: Purchase creation For each non-deleted expired subscription: Status == ”creating”: Check if item finished creation(client) If product is prepaid: Create purchase* Extend expires_at** Verify subscription Status == ”deleting”: Check if item finished deletion(client) If product is not prepaid: Create purchase* Terminate subscription 14
Billing logic: Purchase creation For each non-deleted expired subscription: Status == ”verified”: Check if item is valid(client) Create purchase* Extend expires_at** (*)Create purchase Insert purchase where line_total=quantity(from monitoring )*price/unit_size (**)Extend expires_at += dateutil.relativedelta(interval_unit=interval_size) 15
Discussions Is this worth looking at? Any design problems? More requirements? https://github.com/lzyeval/talk-OSDS-2012 16
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