Add Pgpool Autoscaler API (#1223)

Signed-off-by: MobarakHsn <[email protected]>

apis/autoscaling/v1alpha1/pgpool_helpers.go

@@ -0,0 +1,67 @@
+/*
+Copyright AppsCode Inc. and Contributors
+
+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 (
+	"fmt"
+
+	"kubedb.dev/apimachinery/apis"
+	"kubedb.dev/apimachinery/apis/autoscaling"
+	"kubedb.dev/apimachinery/crds"
+
+	"kmodules.xyz/client-go/apiextensions"
+)
+
+func (r PgpoolAutoscaler) CustomResourceDefinition() *apiextensions.CustomResourceDefinition {
+	return crds.MustCustomResourceDefinition(SchemeGroupVersion.WithResource(ResourcePluralPgpoolAutoscaler))
+}
+
+var _ apis.ResourceInfo = &PgpoolAutoscaler{}
+
+func (r PgpoolAutoscaler) ResourceFQN() string {
+	return fmt.Sprintf("%s.%s", ResourcePluralPgpoolAutoscaler, autoscaling.GroupName)
+}
+
+func (r PgpoolAutoscaler) ResourceShortCode() string {
+	return ResourceCodePgpoolAutoscaler
+}
+
+func (r PgpoolAutoscaler) ResourceKind() string {
+	return ResourceKindPgpoolAutoscaler
+}
+
+func (r PgpoolAutoscaler) ResourceSingular() string {
+	return ResourceSingularPgpoolAutoscaler
+}
+
+func (r PgpoolAutoscaler) ResourcePlural() string {
+	return ResourcePluralPgpoolAutoscaler
+}
+
+func (r PgpoolAutoscaler) ValidateSpecs() error {
+	return nil
+}
+
+var _ StatusAccessor = &PgpoolAutoscaler{}
+
+func (r *PgpoolAutoscaler) GetStatus() AutoscalerStatus {
+	return r.Status
+}
+
+func (r *PgpoolAutoscaler) SetStatus(s AutoscalerStatus) {
+	r.Status = s
+}

apis/autoscaling/v1alpha1/pgpool_types.go

@@ -0,0 +1,95 @@
+/*
+Copyright AppsCode Inc. and Contributors
+
+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 (
+	opsapi "kubedb.dev/apimachinery/apis/ops/v1alpha1"
+
+	core "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+const (
+	ResourceCodePgpoolAutoscaler     = "ppscaler"
+	ResourceKindPgpoolAutoscaler     = "PgpoolAutoscaler"
+	ResourceSingularPgpoolAutoscaler = "pgpoolautoscaler"
+	ResourcePluralPgpoolAutoscaler   = "pgpoolautoscalers"
+)
+
+// PgpoolAutoscaler is the configuration for pgpool
+// autoscaler, which automatically manages pod resources based on historical and
+// real time resource utilization.
+
+// +genclient
+// +k8s:openapi-gen=true
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+
+// +kubebuilder:object:root=true
+// +kubebuilder:resource:path=pgpoolautoscalers,singular=pgpoolautoscaler,shortName=ppscaler,categories={datastore,kubedb,appscode}
+// +kubebuilder:subresource:status
+type PgpoolAutoscaler struct {
+	metav1.TypeMeta `json:",inline"`
+	// Standard object metadata. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata
+	// +optional
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	// Specification of the behavior of the autoscaler.
+	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#spec-and-status.
+	Spec PgpoolAutoscalerSpec `json:"spec"`
+
+	// Current information about the autoscaler.
+	// +optional
+	Status AutoscalerStatus `json:"status,omitempty"`
+}
+
+// PgpoolAutoscalerSpec is the specification of the behavior of the autoscaler.
+type PgpoolAutoscalerSpec struct {
+	DatabaseRef *core.LocalObjectReference `json:"databaseRef"`
+
+	// This field will be used to control the behaviour of ops-manager
+	OpsRequestOptions *PgpoolOpsRequestOptions `json:"opsRequestOptions,omitempty"`
+
+	Compute *PgpoolComputeAutoscalerSpec `json:"compute,omitempty"`
+}
+
+type PgpoolComputeAutoscalerSpec struct {
+	// +optional
+	NodeTopology *NodeTopology `json:"nodeTopology,omitempty"`
+
+	Pgpool *ComputeAutoscalerSpec `json:"pgpool,omitempty"`
+}
+
+type PgpoolOpsRequestOptions struct {
+	// Timeout for each step of the ops request in second. If a step doesn't finish within the specified timeout, the ops request will result in failure.
+	Timeout *metav1.Duration `json:"timeout,omitempty"`
+
+	// ApplyOption is to control the execution of OpsRequest depending on the database state.
+	// +kubebuilder:default="IfReady"
+	Apply opsapi.ApplyOption `json:"apply,omitempty"`
+}
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+// PgpoolAutoscalerList is a list of PgpoolAutoscaler objects.
+type PgpoolAutoscalerList struct {
+	metav1.TypeMeta `json:",inline"`
+	// metadata is the standard list metadata.
+	// +optional
+	metav1.ListMeta `json:"metadata"`
+
+	// items is the list of pgpool database autoscaler objects.
+	Items []PgpoolAutoscaler `json:"items"`
+}