Summary

In this chapter, we first learned about the history and the core concepts of Apache OpenWhisk. Then, we learned how to set up IBM Cloud Functions with CLI to run our serverless functions. After that, OpenWhisk actions were introduced, which are the code snippets written in one of the languages supported by OpenWhisk. We discussed how to write, create, list, invoke, update, and delete OpenWhisk actions using the wsk CLI. Next, we went over OpenWhisk sequences, which are used to combine multiple actions together to create a more complex processing pipeline. Going forward, we learned how to expose actions publicly using a URL with web actions. We discussed how web actions allow us to return additional information from the action, such as HTTP headers and non-JSON payloads, including HTML and binary data. The next section was on feeds, triggers, and rules that automate action invocation using events from external event sources. Finally, OpenWhisk packages were discussed, which...