reconciler

Documentation

Overview

Package reconciler defines implementations of the Reconciler interface defined at github.com/knative/pkg/controller.Reconciler. These implement the basic workhorse functionality of controllers, while leaving the shared controller implementation to manage things like the workqueue.

Despite defining a Reconciler, each of the packages here are expected to expose a controller constructor like:

func NewController(...) *controller.Impl { ... }

These constructors will:

1. Construct the Reconciler,
2. Construct a controller.Impl with that Reconciler,
3. Wire the assorted informers this Reconciler watches to call appropriate enqueue methods on the controller.

Copyright 2018 The Knative Authors

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Index

• func EmitEvent(c record.EventRecorder, beforeCondition *duckv1alpha1.Condition, ...)
• func MustNewStatsReporter(reconciler string, logger *zap.SugaredLogger) controller.StatsReporter
• type Base
  • func NewBase(opt Options, controllerAgentName string) *Base
• type Options
  • func (o Options) GetTrackerLease() time.Duration

Functions

func EmitEvent

func EmitEvent(c record.EventRecorder, beforeCondition *duckv1alpha1.Condition, afterCondition *duckv1alpha1.Condition, object runtime.Object)

EmitEvent emits success or failed event for object if afterCondition is different from beforeCondition

func MustNewStatsReporter

func MustNewStatsReporter(reconciler string, logger *zap.SugaredLogger) controller.StatsReporter

MustNewStatsReporter creates a new instance of StatsReporter. Panics if creation fails.

Types

type Base

type Base struct {
	// KubeClientSet allows us to talk to the k8s for core APIs
	KubeClientSet kubernetes.Interface

	// SharedClientSet allows us to configure shared objects
	SharedClientSet sharedclientset.Interface

	// PipelineClientSet allows us to configure pipeline objects
	PipelineClientSet clientset.Interface

	// CachingClientSet allows us to instantiate Image objects
	CachingClientSet cachingclientset.Interface

	// ConfigMapWatcher allows us to watch for ConfigMap changes.
	ConfigMapWatcher configmap.Watcher

	// Recorder is an event recorder for recording Event resources to the
	// Kubernetes API.
	Recorder record.EventRecorder

	// Sugared logger is easier to use but is not as performant as the
	// raw logger. In performance critical paths, call logger.Desugar()
	// and use the returned raw logger instead. In addition to the
	// performance benefits, raw logger also preserves type-safety at
	// the expense of slightly greater verbosity.
	Logger *zap.SugaredLogger
}

Base implements the core controller logic, given a Reconciler.

func NewBase

func NewBase(opt Options, controllerAgentName string) *Base

NewBase instantiates a new instance of Base implementing the common & boilerplate code between our reconcilers.

type Options

type Options struct {
	KubeClientSet     kubernetes.Interface
	SharedClientSet   sharedclientset.Interface
	PipelineClientSet clientset.Interface
	CachingClientSet  cachingclientset.Interface

	ConfigMapWatcher configmap.Watcher
	Logger           *zap.SugaredLogger
	Recorder         record.EventRecorder

	ResyncPeriod time.Duration
}

Options defines the common reconciler options. We define this to reduce the boilerplate argument list when creating our controllers.

func (Options) GetTrackerLease

func (o Options) GetTrackerLease() time.Duration

GetTrackerLease returns a multiple of the resync period to use as the duration for tracker leases. This attempts to ensure that resyncs happen to refresh leases frequently enough that we don't miss updates to tracked objects.