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Functions WG Charter

Drafted: Apr 28, 2022

Mission

The Functions Working Group aims to simplify application development and deployment to Knative by transforming business logic written as a programming language function into OCI container images, and creating or updating the associated on-cluster resources.

By providing higher-level abstractions through functions, the working group aims to make Knative accessible for developers without extensive Kubernetes or container experience.

Goals

  • Provide a developer experience enabling portable, high-level business logic in several programming languages in the form of a “Function” as a Knative Service.
  • Provide Function invocation, HTTP serving and CloudEvent marshaling capabilities through language frameworks, capable of wrapping and bootstrapping Knative Function code into a runnable service.
  • Provide a developer experience that enables the build and deployment of Knative Functions as OCI container images in a Knative Service.
  • Define and document a pluggable ‘language pack’ contract to adapt developer code to the Knative runtime contract.
    • Additionally, curate a set of language plugins which are recommended to new developers.
  • Implement a shared CLI which provides commands for creation, build, iteration, and deployment of Knative Services using language plugins.
    • The shared CLI should be as broadly useful as possible, supporting both local and remote build tooling.

Non-Goals

  • Provide a general-purpose client which duplicates the functionality of kn.
  • Implement language plugins for all programming languages.

Scope

  • Defining and implementing the interface between developers and the functions CLI.
    • Including command-line options, UX flow, supported commands, source directory requirements, etc.
  • Defining and supporting the language plugin interface.
    • This includes developing and supporting third-party language plugin authors as well as first-party language plugins.
    • This also includes any “catalog” or “template” management and shared services provided to language plugins via the CLI or on-cluster build interfaces.
  • Providing examples and coordinating with the documentation WG to provide user-facing examples and documentation on using the function tools.

Initial Leads

  • Lance Ball - Red Hat
  • Mauricio Salatino - VMWare

Roadmap

https://github.com/orgs/knative-sandbox/projects/7