source

Documentation

Overview

Package source provides event streams provided to Controllers through Controller.Watch. Events are used with handler.EventHandlers to enqueue reconcile.Requests and trigger Reconciles for Kubernetes objects.

Index

• type Channel
  • func (cs *Channel) InjectStopChannel(stop <-chan struct{}) error
  • func (cs *Channel) Start(handler handler.EventHandler, queue workqueue.RateLimitingInterface, ...) error
• type Func
  • func (f Func) Start(evt handler.EventHandler, queue workqueue.RateLimitingInterface, ...) error
• type Kind
  • func (ks *Kind) InjectCache(c cache.Cache) error
  • func (ks *Kind) Start(handler handler.EventHandler, queue workqueue.RateLimitingInterface, ...) error
• type Source

Examples

• Channel
• Kind

Types

type Channel

type Channel struct {

	// Source is the source channel to fetch GenericEvents
	Source <-chan event.GenericEvent

	// DestBufferSize is the specified buffer size of dest channels.
	// Default to 1024 if not specified.
	DestBufferSize int
	// contains filtered or unexported fields
}

Channel is used to provide a source of events originating outside the cluster (eh.g. GitHub Webhook callback). Channel requires the user to wire the external source (eh.g. http handler) to write GenericEvents to the underlying channel.

Example

This example reads GenericEvents from a channel and enqueues a reconcile.Request containing the Name and Namespace provided by the event.

package main

import (
	"sigs.k8s.io/controller-runtime/pkg/controller"
	"sigs.k8s.io/controller-runtime/pkg/event"
	"sigs.k8s.io/controller-runtime/pkg/handler"
	"sigs.k8s.io/controller-runtime/pkg/source"
)

var ctrl controller.Controller

func main() {
	events := make(chan event.GenericEvent)

	ctrl.Watch(
		&source.Channel{Source: events},
		&handler.EnqueueRequestForObject{},
	)
}

func (*Channel) InjectStopChannel

func (cs *Channel) InjectStopChannel(stop <-chan struct{}) error

InjectStopChannel is internal should be called only by the Controller. It is used to inject the stop channel initialized by the ControllerManager.

func (*Channel) Start

func (cs *Channel) Start(
	handler handler.EventHandler,
	queue workqueue.RateLimitingInterface,
	prct ...predicate.Predicate) error

Start implements Source and should only be called by the Controller.

type Func

type Func func(handler.EventHandler, workqueue.RateLimitingInterface, ...predicate.Predicate) error

Func is a function that implements Source

func (Func) Start

func (f Func) Start(evt handler.EventHandler, queue workqueue.RateLimitingInterface,
	pr ...predicate.Predicate) error

Start implements Source

type Kind

type Kind struct {
	// Type is the type of object to watch.  e.g. &v1.Pod{}
	Type runtime.Object
	// contains filtered or unexported fields
}

Kind is used to provide a source of events originating inside the cluster from Watches (eh.g. Pod Create)

Example

This example Watches for Pod Events (e.g. Create / Update / Delete) and enqueues a reconcile.Request with the Name and Namespace of the Pod.

package main

import (
	"k8s.io/api/core/v1"
	"sigs.k8s.io/controller-runtime/pkg/controller"
	"sigs.k8s.io/controller-runtime/pkg/handler"
	"sigs.k8s.io/controller-runtime/pkg/source"
)

var ctrl controller.Controller

func main() {
	ctrl.Watch(&source.Kind{Type: &v1.Pod{}}, &handler.EnqueueRequestForObject{})
}

func (*Kind) InjectCache

func (ks *Kind) InjectCache(c cache.Cache) error

InjectCache is internal should be called only by the Controller. InjectCache is used to inject the Cache dependency initialized by the ControllerManager.

func (*Kind) Start

func (ks *Kind) Start(handler handler.EventHandler, queue workqueue.RateLimitingInterface,
	prct ...predicate.Predicate) error

Start is internal and should be called only by the Controller to register an EventHandler with the Informer to enqueue reconcile.Requests.

type Source

type Source interface {
	// Start is internal and should be called only by the Controller to register an EventHandler with the Informer
	// to enqueue reconcile.Requests.
	Start(handler.EventHandler, workqueue.RateLimitingInterface, ...predicate.Predicate) error
}

Source is a source of events (eh.g. Create, Update, Delete operations on Kubernetes Objects, Webhook callbacks, etc) which should be processed by event.EventHandlers to enqueue reconcile.Requests.

* Use Kind for events originating in the cluster (eh.g. Pod Create, Pod Update, Deployment Update).

* Use Channel for events originating outside the cluster (eh.g. GitHub Webhook callback, Polling external urls).

Users may build their own Source implementations. If their implementations implement any of the inject package interfaces, the dependencies will be injected by the Controller when Watch is called.