machinepools.go

/*
Copyright 2024.

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 controllers

import (
	"context"

	"fmt"
	cmv1 "github.com/openshift-online/ocm-sdk-go/clustersmgmt/v1"
	arbv1 "github.com/project-codeflare/multi-cluster-app-dispatcher/pkg/apis/controller/v1beta1"

	ctrl "sigs.k8s.io/controller-runtime"
)

func (r *AppWrapperReconciler) scaleMachinePool(ctx context.Context, aw *arbv1.AppWrapper, demandPerInstanceType map[string]int) (ctrl.Result, error) {
	logger := ctrl.LoggerFrom(ctx)
	connection, err := r.createOCMConnection()
	if err != nil {
		logger.Error(err, "Error creating OCM connection")
		return ctrl.Result{}, err
	}
	defer connection.Close()
	for userRequestedInstanceType := range demandPerInstanceType {
		replicas := demandPerInstanceType[userRequestedInstanceType]

		clusterMachinePools := connection.ClustersMgmt().V1().Clusters().Cluster(r.ocmClusterID).MachinePools()

		response, err := clusterMachinePools.List().SendContext(ctx)
		if err != nil {
			return ctrl.Result{}, err
		}

		numberOfMachines := 0
		response.Items().Each(func(machinePool *cmv1.MachinePool) bool {
			if machinePool.InstanceType() == userRequestedInstanceType && hasAwLabel(machinePool.Labels(), aw) {
				numberOfMachines = machinePool.Replicas()
				return false
			}
			return true
		})

		if numberOfMachines != replicas {
			label := fmt.Sprintf("%s-%s", aw.Name, aw.Namespace)

			m := make(map[string]string)
			m[label] = label

			machinePoolID := r.generateMachineName(ctx, aw.Name)
			machinePool, err := cmv1.NewMachinePool().ID(machinePoolID).InstanceType(userRequestedInstanceType).Replicas(replicas).Labels(m).Build()
			if err != nil {
				logger.Error(
					err, "Error building MachinePool",
					"userRequestedInstanceType", userRequestedInstanceType,
				)
			}
			logger.Info(
				"Sending MachinePool creation request",
				"instanceType", userRequestedInstanceType,
				"machinePoolName", machinePool.ID(),
			)
			response, err := clusterMachinePools.Add().Body(machinePool).SendContext(ctx)
			if err != nil {
				logger.Error(err, "Error creating MachinePool")
			} else {
				logger.Info(
					"Successfully created MachinePool",
					"machinePoolName", machinePool.ID(),
					"response", response,
				)
			}
		}
	}
	return ctrl.Result{Requeue: false}, nil
}

func (r *AppWrapperReconciler) deleteMachinePool(ctx context.Context, aw *arbv1.AppWrapper) (ctrl.Result, error) {
	logger := ctrl.LoggerFrom(ctx)
	connection, err := r.createOCMConnection()
	if err != nil {
		logger.Error(err, "Error creating OCM connection")
		return ctrl.Result{}, err
	}
	defer connection.Close()

	machinePoolsConnection := connection.ClustersMgmt().V1().Clusters().Cluster(r.ocmClusterID).MachinePools().List()

	machinePoolsListResponse, _ := machinePoolsConnection.Send()
	machinePoolsList := machinePoolsListResponse.Items()
	machinePoolsList.Range(func(index int, item *cmv1.MachinePool) bool {
		if hasAwLabel(item.Labels(), aw) {
			id, _ := item.GetID()
			targetMachinePool, err := connection.ClustersMgmt().V1().Clusters().Cluster(r.ocmClusterID).MachinePools().MachinePool(id).Delete().SendContext(ctx)
			if err != nil {
				logger.Error(
					err, "Error deleting machinepool",
					"machinePool", targetMachinePool,
				)
			} else {
				logger.Info(
					"Successfully scaled down target machinepool",
					"machinePool", targetMachinePool,
				)
			}
		}
		return true
	})

	return ctrl.Result{Requeue: false}, nil
}