Add support for KEDA

addons/keda/duck/v1alpha1/doc.go

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+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You 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 duck contains a partial schema of the KEDA APIs
+// +kubebuilder:object:generate=true
+// +groupName=keda.sh
+package v1alpha1

addons/keda/duck/v1alpha1/duck_types.go

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+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You 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 (
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// +genclient
+// +genclient:onlyVerbs=get,list,watch
+// +genclient:noStatus
+// +kubebuilder:object:root=true
+
+// ScaledObject is a specification for a ScaledObject resource.
+type ScaledObject struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	Spec ScaledObjectSpec `json:"spec"`
+}
+
+// ScaledObjectSpec is the spec for a ScaledObject resource.
+type ScaledObjectSpec struct {
+	ScaleTargetRef *v1.ObjectReference `json:"scaleTargetRef"`
+	// +optional
+	PollingInterval *int32 `json:"pollingInterval,omitempty"`
+	// +optional
+	CooldownPeriod *int32 `json:"cooldownPeriod,omitempty"`
+	// +optional
+	IdleReplicaCount *int32 `json:"idleReplicaCount,omitempty"`
+	// +optional
+	MinReplicaCount *int32 `json:"minReplicaCount,omitempty"`
+	// +optional
+	MaxReplicaCount *int32 `json:"maxReplicaCount,omitempty"`
+
+	Triggers []ScaleTriggers `json:"triggers"`
+}
+
+// ScaleTriggers reference the scaler that will be used.
+type ScaleTriggers struct {
+	Type string `json:"type"`
+	// +optional
+	Name     string            `json:"name,omitempty"`
+	Metadata map[string]string `json:"metadata"`
+	// +optional
+	AuthenticationRef *ScaledObjectAuthRef `json:"authenticationRef,omitempty"`
+	// +optional
+	FallbackReplicas *int32 `json:"fallback,omitempty"`
+}
+
+// ScaledObjectAuthRef points to the TriggerAuthentication or ClusterTriggerAuthentication object that
+// is used to authenticate the scaler with the environment.
+type ScaledObjectAuthRef struct {
+	Name string `json:"name"`
+	// Kind of the resource being referred to. Defaults to TriggerAuthentication.
+	// +optional
+	Kind string `json:"kind,omitempty"`
+}
+
+// +kubebuilder:object:root=true
+
+// ScaledObjectList contains a list of ScaledObject.
+type ScaledObjectList struct {
+	metav1.TypeMeta `json:",inline"`
+	metav1.ListMeta `json:"metadata,omitempty"`
+	Items           []ScaledObject `json:"items"`
+}
+
+// +genclient
+// +genclient:onlyVerbs=get,list,watch
+// +genclient:noStatus
+// +kubebuilder:object:root=true
+
+// TriggerAuthentication defines how a trigger can authenticate.
+type TriggerAuthentication struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	Spec TriggerAuthenticationSpec `json:"spec"`
+}
+
+// TriggerAuthenticationSpec defines the various ways to authenticate.
+type TriggerAuthenticationSpec struct {
+	// +optional
+	SecretTargetRef []AuthSecretTargetRef `json:"secretTargetRef,omitempty"`
+}
+
+// AuthSecretTargetRef is used to authenticate using a reference to a secret.
+type AuthSecretTargetRef struct {
+	Parameter string `json:"parameter"`
+	Name      string `json:"name"`
+	Key       string `json:"key"`
+}
+
+// +kubebuilder:object:root=true
+
+// TriggerAuthenticationList contains a list of TriggerAuthentication.
+type TriggerAuthenticationList struct {
+	metav1.TypeMeta `json:",inline"`
+	metav1.ListMeta `json:"metadata"`
+	Items           []TriggerAuthentication `json:"items"`
+}

addons/keda/duck/v1alpha1/duck_types_support.go

@@ -0,0 +1,39 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You 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 (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+const (
+	ScaledObjectKind = "ScaledObject"
+)
+
+func NewScaledObject(namespace string, name string) ScaledObject {
+	return ScaledObject{
+		TypeMeta: metav1.TypeMeta{
+			APIVersion: SchemeGroupVersion.String(),
+			Kind:       ScaledObjectKind,
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Namespace: namespace,
+			Name:      name,
+		},
+	}
+}

addons/keda/duck/v1alpha1/register.go

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+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You 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 (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+const (
+	KEDAGroup   = "keda.sh"
+	KEDAVersion = "v1alpha1"
+)
+
+var (
+	// SchemeGroupVersion is group version used to register these objects.
+	SchemeGroupVersion = schema.GroupVersion{Group: KEDAGroup, Version: KEDAVersion}
+
+	// SchemeBuilder is used to add go types to the GroupVersionKind scheme.
+	SchemeBuilder = runtime.NewSchemeBuilder(addKnownTypes)
+
+	// AddToScheme is a shortcut to SchemeBuilder.AddToScheme.
+	AddToScheme = SchemeBuilder.AddToScheme
+)
+
+// Resource takes an unqualified resource and returns a Group qualified GroupResource.
+func Resource(resource string) schema.GroupResource {
+	return SchemeGroupVersion.WithResource(resource).GroupResource()
+}
+
+// Adds the list of known types to Scheme.
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(SchemeGroupVersion,
+		&ScaledObject{},
+		&ScaledObjectList{},
+		&TriggerAuthentication{},
+		&TriggerAuthenticationList{},
+	)
+	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
+	return nil
+}