OpsAny PaaS Architecture

The paas service in the PaaS platform

The paas service provides the developer center and the web workbench of the PaaS platform.

Main responsibilities:

• Provide SaaS users with the entry point to SaaS applications
• Provide SaaS developers with the tools to develop and manage SaaS applications
• Provide platform administrators with the user management entry point

It consists of the web workbench and the developer center:

• Web workbench: the list of published SaaS applications as the single entry point, along with a set of commonly used links; administrators can also manage users here
• Developer center: entry points for creating, deploying, and unpublishing SaaS applications; manages server information and third-party service information; also provides the documentation and resource downloads required for SaaS development

Technology stack

• framework: Django 1.8.11
• template: mako
• database: mysql

Dependencies

• mysql: platform database
• appengine: calls the appengine API to deploy and unpublish applications
• login: calls the unified login API to determine the user's login state

The login service in the PaaS platform

login is the unified authentication service.

Main responsibilities: - Provide unified user authentication and single sign-on for the PaaS platform and SaaS applications - Support unified user management and simple authorization - Support federating unified login with an enterprise's internal identity system

It consists of the unified login module and the custom enterprise login module:

• Unified login module: the user login entry point, user information management, and simple authorization management
• Custom enterprise login module: federates PaaS unified login with an enterprise's internal identity system so users authenticate with enterprise credentials

Technology stack

• framework: Django 1.8.11
• database: mysql

Dependent services

• mysql: platform database

Appengine in the PaaS platform

The appengine directory contains the source of the backend service module (application engine) that hosts SaaS applications in the PaaS platform.

Main responsibilities:

• Manage the SaaS application lifecycle — test submission, release, and unpublishing — by interacting with PaaSAgent
• Manage the third-party services SaaS applications depend on, including service requests and configuration

Technology stack

• framework: Django 1.8.11
• database: mysql

Dependencies

• paasagent: calls the paasagent API to manage the SaaS application lifecycle
• mysql: platform database

ESB in the PaaS platform

ESB is the API service bus of the PaaS platform. It wraps the interfaces of underlying atomic platforms or third-party systems — either self-service or by coding — into atomic components, and exposes them to upper-layer SaaS applications following a unified cloud API specification. The esb directory contains the API gateway source.

Main responsibilities of the API gateway:

• Provide APIs to SaaS application developers
• Let administrators onboard APIs onto the gateway in self-service
• Provide administrators with a gateway management entry point
• Provide component development templates so API components can be developed in code and connected to the gateway

Technology stack

• framework: Django 1.8.11
• database: mysql
• cache: redis

Dependencies

• mysql: platform database
• redis: cache service
• login: calls the unified login API to determine the user's login state
• paas: accesses the PaaS platform database to authenticate SaaS applications