https://github.com/lionelvillard/knative-functions

A collection of Knative functions
https://github.com/lionelvillard/knative-functions

Last synced: 23 days ago
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A collection of Knative functions

• Host: GitHub
• URL: https://github.com/lionelvillard/knative-functions
• Owner: lionelvillard
• License: apache-2.0
• Created: 2019-07-30T14:43:55.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2022-03-03T21:47:49.000Z (over 2 years ago)
• Last Synced: 2023-03-03T12:23:50.876Z (over 1 year ago)
• Language: JavaScript
• Size: 15.7 MB
• Stars: 6
• Watchers: 1
• Forks: 3
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Knative Eventing Functions

[![Build Status](https://travis-ci.org/lionelvillard/knative-functions.svg?branch=master)](https://travis-ci.org/lionelvillard/knative-functions)

This project provides a collection of functions manipulating [Cloud Events](https://cloudevents.io).

All functions are currently only _callable_ (synchronous). We are planning to add _composable_ (asynchronous) functions

the near future.

## Installation

You first need to install the [Knative Eventing Function Controller](https://github.com/lionelvillard/knative-functions-controller):

```sh

kubectl apply -f https://github.com/lionelvillard/knative-functions-controller/releases/download/v0.1.2/function.yaml

```

Then install the function library:

```sh

kubectl apply -f https://github.com/lionelvillard/knative-functions/releases/download/v0.2.0/functions.yaml

```

## Functions

The functions are:

- [Wait](#wait)

- [Filter](#filter)

### Wait

The `Wait` function forward events after X seconds.

#### Example

```yaml

apiVersion: functions.knative.dev/v1alpha1

kind: Wait

metadata:

  name: wait-5

spec:

  seconds: 5

```

### Filter

A filter takes a cloud event as input, evaluates a predicate against it and returns the

unmodified event when the predicate return true, otherwise returns an empty response.

The predicate must be a Javascript expression. It is evaluated in a sandbox with the variable [`event`](https://github.com/cloudevents/spec/blob/v1.0/json-format.md)

### Example

```yaml

apiVersion: functions.knative.dev/v1alpha1

kind: Filter

metadata:

  name: filter

spec:

  expression: event.data.assigned

```