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Sample Source Lifecycle and Types

API Definition

  1. Define the types required in the resource’s schema in pkg/apis/samples/v1alpha1/samplesource_types.go This includes the fields that will be required in the resource yaml as well as what will be referenced in the controller using the source’s clientset and API

// +genclient
// +genreconciler
// +k8s:openapi-gen=true
type SampleSource struct {
    metav1.TypeMeta `json:",inline"`
    // +optional
    metav1.ObjectMeta `json:"metadata,omitempty"`

    // Spec holds the desired state of the SampleSource (from the client).
    Spec SampleSourceSpec `json:"spec"`

    // Status communicates the observed state of the SampleSource (from the controller).
    // +optional
    Status SampleSourceStatus `json:"status,omitempty"`

// SampleSourceSpec holds the desired state of the SampleSource (from the client).
type SampleSourceSpec struct {
    // inherits duck/v1 SourceSpec, which currently provides:
    // * Sink - a reference to an object that will resolve to a domain name or
    //   a URI directly to use as the sink.
    // * CloudEventOverrides - defines overrides to control the output format
    //   and modifications of the event sent to the sink.
    duckv1.SourceSpec `json:",inline"`

    // ServiceAccountName holds the name of the Kubernetes service account
    // as which the underlying K8s resources should be run. If unspecified
    // this will default to the "default" service account for the namespace
    // in which the SampleSource exists.
    // +optional
    ServiceAccountName string `json:"serviceAccountName,omitempty"`

    // Interval is the time interval between events.
    // The string format is a sequence of decimal numbers, each with optional
    // fraction and a unit suffix, such as "300ms", "-1.5h" or "2h45m". Valid time
    // units are "ns", "us" (or "µs"), "ms", "s", "m", "h". If unspecified
    // this will default to "10s".
    Interval string `json:"interval"`

// SampleSourceStatus communicates the observed state of the SampleSource (from the controller).
type SampleSourceStatus struct {
    duckv1.Status `json:",inline"`

    // SinkURI is the current active sink URI that has been configured
    // for the SampleSource.
    // +optional
    SinkURI *apis.URL `json:"sinkUri,omitempty"`
Define the lifecycle that will be reflected in the status and SinkURI fields

const (
    // SampleConditionReady has status True when the SampleSource is ready to send events.
    SampleConditionReady = apis.ConditionReady
    // ...
Define the functions that will be called from the Reconciler functions to set the lifecycle conditions. This is typically done in pkg/apis/samples/VERSION/samplesource_lifecycle.go

// InitializeConditions sets relevant unset conditions to Unknown state.
func (s *SampleSourceStatus) InitializeConditions() {


// MarkSink sets the condition that the source has a sink configured.
func (s *SampleSourceStatus) MarkSink(uri *apis.URL) {
    s.SinkURI = uri
    if len(uri.String()) > 0 {
    } else {
        SampleCondSet.Manage(s).MarkUnknown(SampleConditionSinkProvided, "SinkEmpty", "Sink has resolved to empty.%s", "")

// MarkNoSink sets the condition that the source does not have a sink configured.
func (s *SampleSourceStatus) MarkNoSink(reason, messageFormat string, messageA ...interface{}) {
    SampleCondSet.Manage(s).MarkFalse(SampleConditionSinkProvided, reason, messageFormat, messageA...)
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