CachePurge: Cache Invalidation and Purge for multiple CDNs

CachePurge is a centralized service that allows the user to invalidate and purge cache from multiple CDNs easily.

Introduction

CacheOut is implemented in C# using the .NET core framework and uses a combination of Azure Functions, CosmosDB and Azure Queues to create a workflow that begins upon receiving a purge request from the user.

The design is as follows:

Getting Started

Local Setup

• Refer to this doc for prerequisites: Code and Test Azure functions locally
• Clone this repo to your local drive
• Once your local environment is setup, edit EnvironmentConfig.cs with your config values

Making changes

The project structure is divided into the following:

1. CachePurgeLibrary:

   • non-CDN specific code that is utilized throughout the solution
   • no changes needed if you're not making significant structural changes to the project

2. CdnLibrary:

   • CDN library code used in CdnPlugins and MultiCdnApi
   • will need to edit this project heavily to add your own custom CDN specific processing logic

3. CdnPlugins:

   • contains CdnPlugin functions and EventCompletion function
   • change as needed based on CDNs used

4. MultiCdnApi:

   • contains user facing API
   • change as needed based on CDNs and user input

To make changes to the CDNs for e.g. to add or remove a CDN, you will need to add your custom CDN logic to CdnLibrary. Propagate the changes down to CdnPlugins and MultiCdnApi.