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Serverless Overview

Serverless technology is a means of adding custom behaviour without having to worry too much about infrastructure, deployment, or maintenance. Serverless functions are single-purpose, programmatic functions that are hosted by cloud computing platforms.

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  • If you were a customer before Nov 10th 2023, you can continue to access the legacy OpenWhisk docs until Dec 31st 2024
  • The next sections are related to the modern Hypi Fenrir Serverless platform

@fn directive​

Serverless support is provided through a GraphQL directive @fn. The @fn directive has the following structure.

directive @fn(
  name: String!
  version: String!
  env: [String!]
) on FIELD_DEFINITION

It is applied to fields in your Hypi app's schema and the Hypi platform will invoke the function named in the directive in order to get the value of the field.

type Query {
  myFnName(a: Int, b: String, c: Float, d: Boolean, e: Json, f: MyType): Json @fn(name:"my-fn", version: "v1", env: ["abc"]) 
}

Here, when myFnName is used in a query, version v1 of the my-fn serverless function will be called and the environment variable abc will be passed into the function along with all the args to the field.