markito / faas

Function as a Service CLI and Client Libray for Knative-enabled Clusters.

faas

Function as a Service CLI and Client Library for KNative-enabled Kubernetes Clusters.

Local Setup and Configuration

Docker is required unless the --local flag is explicitly provided on creation of a new function.

It is recommended to set your preferred image registry for publishing Functions by setting the following environment variables:

export FAAS_REGISTRY=quay.io
export FAAS_NAMESPACE=alice

Alternately, these values can be provided using the --namespace and --registry flags when running the CLI.

Cluster Setup and Configuration

It is assumed that the local system has a kubectl configuration set up to connect to a Kubernetes cluster with the following configuration:

• Knative Serving and Eventing Installed
• Knative Domains patched to enable your chosen domain
• Knative Network patched to enable subdomains
• Kourier
• (optionally) Cert-manager for HTTPS routes

See https://github.com/boson-project/config for cluster setup and configuration notes.

Running the CLI

The CLI can be run either by building and installing manually, by running one of the published containers, or using the appropriate pre-built binary releases.

Build and Install

With Go 1.13+ installed, build and install the binary to your path:

go install ./cmd/faas

Docker

Each tag has an assoicated container which can be run via:

docker run quay.io/boson/faas:v0.2.2

Pre-built Binary Releases

Coming soon.

Usage

See help:

faas

Examples

Create a new Function:

> mkdir -p example.com/www
> cd example.com/www
> faas create go
https://www.example.com
> curl https://www.example.com
OK

Using the Client Library

To create a Client which uses the included buildpacks-based function builder, pushes to a Quay.io repository function container artifacts and deploys to a Knative enabled cluster:

package main

import (
  "log"

  "github.com/boson-project/faas"
  "github.com/boson-project/faas/buildpacks"
  "github.com/boson-project/faas/docker"
  "github.com/boson-project/faas/embedded"
  "github.com/boson-project/faas/knative"
)

func main() {
  // A client which uses embedded function templates,
  // Quay.io/alice for interstitial build artifacts.
  // Docker to build and push, and a Knative client for deployment.
  client, err := faas.New(
    faas.WithInitializer(embedded.NewInitializer("")),
    faas.WithBuilder(buildpacks.NewBuilder("quay.io", "alice")),
    faas.WithPusher(docker.NewPusher()),
    faas.WithDeployer(knative.NewDeployer()))

  // Create a Go function which listens for CloudEvents.
  // Publicly routable as https://www.example.com.
  // Local implementation is written to the current working directory.
  if err := client.Create("go", "events", "www.example.com", "."); err != nil {
    log.Fatal(err)
  }
}