[WIP] Trigger Reconciler for ConsumerGroup scaling

control-plane/pkg/apis/internals/kafka/eventing/v1alpha1/consumer_defaults.go

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2021 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.
+ */
+
+package v1alpha1
+
+import (
+	"context"
+
+	"knative.dev/pkg/apis"
+)
+
+var (
+	_ apis.Defaultable = &Consumer{}
+)
+
+// SetDefaults implements apis.Defaultable.
+func (c *Consumer) SetDefaults(ctx context.Context) {
+	ctx = apis.WithinParent(ctx, c.ObjectMeta)
+	c.Spec.SetDefaults(ctx)
+}
+
+func (c *ConsumerSpec) SetDefaults(ctx context.Context) {
+	c.Delivery.SetDefaults(ctx)
+	c.Subscriber.SetDefaults(ctx)
+}
+
+func (d *DeliverySpec) SetDefaults(ctx context.Context) {
+	if d == nil {
+		return
+	}
+	d.DeliverySpec.SetDefaults(ctx)
+}

control-plane/pkg/apis/internals/kafka/eventing/v1alpha1/consumer_defaults_test.go

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2021 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.
+ */
+
+package v1alpha1
+
+import (
+	"context"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestConsumerSetDefaults(t *testing.T) {
+	tests := []struct {
+		name  string
+		ctx   context.Context
+		given *Consumer
+		want  *Consumer
+	}{
+		{
+			name: "with delivery",
+			ctx:  context.Background(),
+			given: &Consumer{
+				Spec: ConsumerSpec{Delivery: &DeliverySpec{}},
+			},
+			want: &Consumer{
+				Spec: ConsumerSpec{Delivery: &DeliverySpec{}},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tt.given.SetDefaults(tt.ctx)
+			if diff := cmp.Diff(tt.want, tt.given); diff != "" {
+				t.Error("(-want, +got)", diff)
+			}
+		})
+	}
+}

control-plane/pkg/apis/internals/kafka/eventing/v1alpha1/consumer_group_defaults.go

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2021 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.
+ */
+
+package v1alpha1
+
+import (
+	"context"
+
+	"k8s.io/utils/pointer"
+	"knative.dev/pkg/apis"
+)
+
+var (
+	_ apis.Defaultable = &ConsumerGroup{}
+)
+
+// SetDefaults implements apis.Defaultable.
+func (cg *ConsumerGroup) SetDefaults(ctx context.Context) {
+	ctx = apis.WithinParent(ctx, cg.ObjectMeta)
+
+	// Replicas is the number of Consumers for this ConsumerGroup.
+	// When unset, set it to 1.
+	if cg.Spec.Replicas == nil {
+		cg.Spec.Replicas = pointer.Int32Ptr(1)
+	}
+	// Selector is a label query over consumers that should match the Replicas count.
+	// If Selector is empty, it is defaulted to the labels present on the template.
+	if cg.Spec.Selector == nil || len(cg.Spec.Selector) == 0 {
+		cg.Spec.Selector = cg.Spec.Template.Labels
+	}
+
+	// Force template namespace to be set to ConsumerGroup's namespace.
+	cg.Spec.Template.Namespace = cg.Namespace
+	cg.Spec.Template.Spec.SetDefaults(ctx)
+}

control-plane/pkg/apis/internals/kafka/eventing/v1alpha1/consumer_group_defaults_test.go

@@ -0,0 +1,138 @@
+/*
+ * Copyright 2021 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.
+ */
+
+package v1alpha1
+
+import (
+	"context"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/utils/pointer"
+)
+
+func TestConsumerGroupSetDefaults(t *testing.T) {
+	tests := []struct {
+		name  string
+		ctx   context.Context
+		given *ConsumerGroup
+		want  *ConsumerGroup
+	}{
+		{
+			name: "default replicas",
+			ctx:  context.Background(),
+			given: &ConsumerGroup{
+				ObjectMeta: metav1.ObjectMeta{
+					Namespace: "ns",
+					Name:      "name",
+				},
+				Spec: ConsumerGroupSpec{
+					Template: ConsumerTemplateSpec{
+						ObjectMeta: metav1.ObjectMeta{
+							Namespace: "ns",
+						},
+					},
+				},
+			},
+			want: &ConsumerGroup{
+				ObjectMeta: metav1.ObjectMeta{
+					Namespace: "ns",
+					Name:      "name",
+				},
+				Spec: ConsumerGroupSpec{
+					Template: ConsumerTemplateSpec{
+						ObjectMeta: metav1.ObjectMeta{
+							Namespace: "ns",
+						},
+					},
+					Replicas: pointer.Int32Ptr(1),
+				},
+			},
+		},
+		{
+			name: "default selector",
+			ctx:  context.Background(),
+			given: &ConsumerGroup{
+				ObjectMeta: metav1.ObjectMeta{
+					Namespace: "ns",
+					Name:      "name",
+				},
+				Spec: ConsumerGroupSpec{
+					Template: ConsumerTemplateSpec{
+						ObjectMeta: metav1.ObjectMeta{
+							Namespace: "ns",
+							Labels:    map[string]string{"app": "app"},
+						},
+					},
+					Replicas: pointer.Int32Ptr(1),
+				},
+			},
+			want: &ConsumerGroup{
+				ObjectMeta: metav1.ObjectMeta{
+					Namespace: "ns",
+					Name:      "name",
+				},
+				Spec: ConsumerGroupSpec{
+					Template: ConsumerTemplateSpec{
+						ObjectMeta: metav1.ObjectMeta{
+							Namespace: "ns",
+							Labels:    map[string]string{"app": "app"},
+						},
+					},
+					Replicas: pointer.Int32Ptr(1),
+					Selector: map[string]string{"app": "app"},
+				},
+			},
+		},
+		{
+			name: "default namespace",
+			ctx:  context.Background(),
+			given: &ConsumerGroup{
+				ObjectMeta: metav1.ObjectMeta{
+					Namespace: "ns",
+					Name:      "name",
+				},
+				Spec: ConsumerGroupSpec{
+					Replicas: pointer.Int32Ptr(1),
+				},
+			},
+			want: &ConsumerGroup{
+				ObjectMeta: metav1.ObjectMeta{
+					Namespace: "ns",
+					Name:      "name",
+				},
+				Spec: ConsumerGroupSpec{
+					Template: ConsumerTemplateSpec{
+						ObjectMeta: metav1.ObjectMeta{
+							Namespace: "ns",
+						},
+					},
+					Replicas: pointer.Int32Ptr(1),
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tt.given.SetDefaults(tt.ctx)
+
+			if diff := cmp.Diff(tt.want, tt.given); diff != "" {
+				t.Error("(-want, +got)", diff)
+			}
+		})
+	}
+}

control-plane/pkg/apis/internals/kafka/eventing/v1alpha1/consumer_group_lifecycle.go

@@ -17,9 +17,31 @@
 package v1alpha1
 
 import (
+	"fmt"
+
 	"knative.dev/pkg/apis"
 )
 
+const (
+	ConditionConsumers apis.ConditionType = "Consumers"
+)
+
+var (
+	conditionSet = apis.NewLivingConditionSet(
+		ConditionConsumers,
+	)
+)
+
 func (c *ConsumerGroup) GetConditionSet() apis.ConditionSet {
-	return apis.NewLivingConditionSet()
+	return conditionSet
+}
+
+func (cg *ConsumerGroup) MarkReconcileConsumersFailed(reason string, err error) error {
+	err = fmt.Errorf("failed to reconcile consumers: %w", err)
+	cg.GetConditionSet().Manage(cg.GetStatus()).MarkFalse(ConditionConsumers, reason, err.Error())
+	return err
+}
+
+func (cg *ConsumerGroup) MarkReconcileConsumersSucceeded() {
+	cg.GetConditionSet().Manage(cg.GetStatus()).MarkTrue(ConditionConsumers)
 }

control-plane/pkg/apis/internals/kafka/eventing/v1alpha1/consumer_group_types.go

@@ -19,9 +19,8 @@ package v1alpha1
 import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
-	duckv1 "knative.dev/pkg/apis/duck/v1"
-
 	eventingduckv1alpha1 "knative.dev/eventing/pkg/apis/duck/v1alpha1"
+	duckv1 "knative.dev/pkg/apis/duck/v1"
 )
 
 // +genclient
@@ -65,6 +64,14 @@ type ConsumerGroupSpec struct {
 	// If unspecified, defaults to 1.
 	// +optional
 	Replicas *int32 `json:"replicas,omitempty"`
+
+	// Selector is a label query over consumers that should match the Replicas count.
+	// If Selector is empty, it is defaulted to the labels present on the template.
+	// Label keys and values that must match in order to be controlled by this
+	// controller, if empty defaulted to labels on template.
+	// More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors
+	// +optional
+	Selector map[string]string `json:"selector,omitempty" protobuf:"bytes,2,rep,name=selector"`
 }
 
 type ConsumerGroupStatus struct {
@@ -102,3 +109,20 @@ func (c *ConsumerGroup) GetUntypedSpec() interface{} {
 func (c *ConsumerGroup) GetStatus() *duckv1.Status {
 	return &c.Status.Status
 }
+
+// ConsumerFromTemplate returns a Consumer from the Consumer template in the ConsumerGroup spec.
+func (cg *ConsumerGroup) ConsumerFromTemplate(options ...ConsumerOption) *Consumer {
+	// TODO figure out naming strategy, is generateName enough?
+	c := &Consumer{
+		ObjectMeta: cg.Spec.Template.ObjectMeta,
+		Spec:       cg.Spec.Template.Spec,
+	}
+
+	ownerRef := metav1.NewControllerRef(cg, ConsumerGroupGroupVersionKind)
+	c.OwnerReferences = append(c.OwnerReferences, *ownerRef)
+
+	for _, opt := range options {
+		opt(c)
+	}
+	return c
+}