OpenWhisk Actions

In OpenWhisk, actions are code snippets written by developers that will be executed in response to events. These actions can be written in any programming language supported by OpenWhisk:

• Ballerina
• Go
• Java
• JavaScript
• PHP
• Python
• Ruby
• Swift
• .NET Core

Also, we can use a custom Docker image if our preferred language runtime is not supported by OpenWhisk yet. These actions will receive a JSON object as input, then perform the necessary processing within the action, and finally return a JSON object with the processed results. In the following sections, we will focus on how to write, create, list, invoke, update, and delete OpenWhisk actions using the wsk CLI.

Writing Actions for OpenWhisk

When writing OpenWhisk actions with your preferred language, there are few standards that you must follow. They are as follows:

• Each action should have a function named main, which is the entry point of the action. The source...