path: root/src/k8splugin/internal/app/instance.go

/*
 * Copyright 2018 Intel Corporation, Inc
 * Copyright © 2021 Samsung Electronics
 * Copyright © 2021 Orange
 * Copyright © 2021 Nokia Bell Labs
 *
 * 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 app

import (
	"context"
	"encoding/json"
	"log"
	"strconv"
	"strings"
	"time"

	appsv1 "k8s.io/api/apps/v1"
	batchv1 "k8s.io/api/batch/v1"
	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/cli-runtime/pkg/resource"

	"github.com/onap/multicloud-k8s/src/k8splugin/internal/config"
	"github.com/onap/multicloud-k8s/src/k8splugin/internal/db"
	"github.com/onap/multicloud-k8s/src/k8splugin/internal/helm"
	"github.com/onap/multicloud-k8s/src/k8splugin/internal/namegenerator"
	"github.com/onap/multicloud-k8s/src/k8splugin/internal/rb"
	"github.com/onap/multicloud-k8s/src/k8splugin/internal/statuscheck"

	pkgerrors "github.com/pkg/errors"
	"helm.sh/helm/v3/pkg/release"
)

// InstanceRequest contains the parameters needed for instantiation
// of profiles
type InstanceRequest struct {
	RBName         string            `json:"rb-name"`
	RBVersion      string            `json:"rb-version"`
	ProfileName    string            `json:"profile-name"`
	ReleaseName    string            `json:"release-name"`
	CloudRegion    string            `json:"cloud-region"`
	Labels         map[string]string `json:"labels"`
	OverrideValues map[string]string `json:"override-values"`
}

// InstanceResponse contains the response from instantiation
type InstanceResponse struct {
	ID          string                    `json:"id"`
	Request     InstanceRequest           `json:"request"`
	Namespace   string                    `json:"namespace"`
	ReleaseName string                    `json:"release-name"`
	Resources   []helm.KubernetesResource `json:"resources"`
	Hooks       []*helm.Hook              `json:"-"`
}

// InstanceDbData contains the data to put to Db
type InstanceDbData struct {
	ID                 string                    `json:"id"`
	Request            InstanceRequest           `json:"request"`
	Namespace          string                    `json:"namespace"`
	Status             string                    `json:"status"`
	ReleaseName        string                    `json:"release-name"`
	Resources          []helm.KubernetesResource `json:"resources"`
	Hooks              []*helm.Hook              `json:"hooks"`
	HookProgress       string                    `json:"hook-progress"`
	PreInstallTimeout  int64                     `json:"PreInstallTimeout"`
	PostInstallTimeout int64                     `json:"PostInstallTimeout"`
	PreDeleteTimeout   int64                     `json:"PreDeleteTimeout"`
	PostDeleteTimeout  int64                     `json:"PostDeleteTimeout"`
}

// InstanceMiniResponse contains the response from instantiation
// It does NOT include the created resources.
// Use the regular GET to get the created resources for a particular instance
type InstanceMiniResponse struct {
	ID          string          `json:"id"`
	Request     InstanceRequest `json:"request"`
	ReleaseName string          `json:"release-name"`
	Namespace   string          `json:"namespace"`
}

// InstanceStatus is what is returned when status is queried for an instance
type InstanceStatus struct {
	Request         InstanceRequest  `json:"request"`
	Ready           bool             `json:"ready"`
	ResourceCount   int32            `json:"resourceCount"`
	ResourcesStatus []ResourceStatus `json:"resourcesStatus"`
}

// InstanceManager is an interface exposes the instantiation functionality
type InstanceManager interface {
	Create(i InstanceRequest) (InstanceResponse, error)
	Get(id string) (InstanceResponse, error)
	GetFull(id string) (InstanceDbData, error)
	Status(id string) (InstanceStatus, error)
	Query(id, apiVersion, kind, name, labels string) (InstanceStatus, error)
	List(rbname, rbversion, profilename string) ([]InstanceMiniResponse, error)
	Find(rbName string, ver string, profile string, labelKeys map[string]string) ([]InstanceMiniResponse, error)
	Delete(id string) error
	RecoverCreateOrDelete(id string) error
}

// InstanceKey is used as the primary key in the db
type InstanceKey struct {
	ID string `json:"id"`
}

// We will use json marshalling to convert to string to
// preserve the underlying structure.
func (dk InstanceKey) String() string {
	out, err := json.Marshal(dk)
	if err != nil {
		return ""
	}

	return string(out)
}

// InstanceClient implements the InstanceManager interface
// It will also be used to maintain some localized state
type InstanceClient struct {
	storeName string
	tagInst   string
}

// NewInstanceClient returns an instance of the InstanceClient
// which implements the InstanceManager
func NewInstanceClient() *InstanceClient {
	//TODO: Call RecoverCreateOrDelete to perform recovery when the plugin restart.
	//Not implement here now because We have issue with current test set (date race)

	return &InstanceClient{
		storeName: "rbdef",
		tagInst:   "instance",
	}
}

// Simplified function to retrieve model data from instance ID
func resolveModelFromInstance(instanceID string) (rbName, rbVersion, profileName, releaseName string, err error) {
	v := NewInstanceClient()
	resp, err := v.Get(instanceID)
	if err != nil {
		return "", "", "", "", pkgerrors.Wrap(err, "Getting instance")
	}
	return resp.Request.RBName, resp.Request.RBVersion, resp.Request.ProfileName, resp.ReleaseName, nil
}

// Create an instance of rb on the cluster  in the database
func (v *InstanceClient) Create(i InstanceRequest) (InstanceResponse, error) {
	// Name is required
	if i.RBName == "" || i.RBVersion == "" || i.ProfileName == "" || i.CloudRegion == "" {
		return InstanceResponse{},
			pkgerrors.New("RBName, RBversion, ProfileName, CloudRegion are required to create a new instance")
	}

	//Check if profile exists
	profile, err := rb.NewProfileClient().Get(i.RBName, i.RBVersion, i.ProfileName)
	if err != nil {
		return InstanceResponse{}, pkgerrors.New("Unable to find Profile to create instance")
	}

	//Convert override values from map to array of strings of the following format
	//foo=bar
	overrideValues := []string{}
	var preInstallTimeOut, postInstallTimeOut, preDeleteTimeout, postDeleteTimeout int64
	if i.OverrideValues != nil {
		preInstallTimeOutStr, ok := i.OverrideValues["k8s-rb-instance-pre-install-timeout"]
		if !ok {
			preInstallTimeOutStr = "60"
		}
		preInstallTimeOut, err = strconv.ParseInt(preInstallTimeOutStr, 10, 64)
		if err != nil {
			return InstanceResponse{}, pkgerrors.Wrap(err, "Error parsing k8s-rb-instance-pre-install-timeout")
		}

		postInstallTimeOutStr, ok := i.OverrideValues["k8s-rb-instance-post-install-timeout"]
		if !ok {
			postInstallTimeOutStr = "600"
		}
		postInstallTimeOut, err = strconv.ParseInt(postInstallTimeOutStr, 10, 64)
		if err != nil {
			return InstanceResponse{}, pkgerrors.Wrap(err, "Error parsing k8s-rb-instance-post-install-timeout")
		}

		preDeleteTimeOutStr, ok := i.OverrideValues["k8s-rb-instance-pre-delete-timeout"]
		if !ok {
			preDeleteTimeOutStr = "60"
		}
		preDeleteTimeout, err = strconv.ParseInt(preDeleteTimeOutStr, 10, 64)
		if err != nil {
			return InstanceResponse{}, pkgerrors.Wrap(err, "Error parsing k8s-rb-instance-pre-delete-timeout")
		}

		postDeleteTimeOutStr, ok := i.OverrideValues["k8s-rb-instance-post-delete-timeout"]
		if !ok {
			postDeleteTimeOutStr = "600"
		}
		postDeleteTimeout, err = strconv.ParseInt(postDeleteTimeOutStr, 10, 64)
		if err != nil {
			return InstanceResponse{}, pkgerrors.Wrap(err, "Error parsing k8s-rb-instance-post-delete-timeout")
		}

		for k, v := range i.OverrideValues {
			overrideValues = append(overrideValues, k+"="+v)
		}
	} else {
		preInstallTimeOut = 60
		postInstallTimeOut = 600
		preDeleteTimeout = 60
		postDeleteTimeout = 600
	}

	id := namegenerator.Generate()

	overrideValues = append(overrideValues, "k8s-rb-instance-id="+id)

	//Execute the kubernetes create command
	sortedTemplates, crdList, hookList, releaseName, err := rb.NewProfileClient().Resolve(i.RBName, i.RBVersion, i.ProfileName, overrideValues, i.ReleaseName)
	if err != nil {
		namegenerator.Release(id)
		return InstanceResponse{}, pkgerrors.Wrap(err, "Error resolving helm charts")
	}

	k8sClient := KubernetesClient{}
	err = k8sClient.Init(i.CloudRegion, id)
	if err != nil {
		namegenerator.Release(id)
		return InstanceResponse{}, pkgerrors.Wrap(err, "Getting CloudRegion Information")
	}

	log.Printf("Main rss info")
	for _, t := range sortedTemplates {
		log.Printf("  Path: %s", t.FilePath)
		log.Printf("    Kind: %s", t.GVK.Kind)
	}

	log.Printf("Crd rss info")
	for _, t := range crdList {
		log.Printf("  Path: %s", t.FilePath)
		log.Printf("    Kind: %s", t.GVK.Kind)
	}

	log.Printf("Hook info")
	for _, h := range hookList {
		log.Printf("  Name: %s", h.Hook.Name)
		log.Printf("    Events: %s", h.Hook.Events)
		log.Printf("    Weight: %d", h.Hook.Weight)
		log.Printf("    DeletePolicies: %s", h.Hook.DeletePolicies)
	}
	dbData := InstanceDbData{
		ID:                 id,
		Request:            i,
		Namespace:          profile.Namespace,
		ReleaseName:        releaseName,
		Status:             "PRE-INSTALL",
		Resources:          []helm.KubernetesResource{},
		Hooks:              hookList,
		HookProgress:       "",
		PreInstallTimeout:  preInstallTimeOut,
		PostInstallTimeout: postInstallTimeOut,
		PreDeleteTimeout:   preDeleteTimeout,
		PostDeleteTimeout:  postDeleteTimeout,
	}

	err = k8sClient.ensureNamespace(profile.Namespace)
	if err != nil {
		namegenerator.Release(id)
		return InstanceResponse{}, pkgerrors.Wrap(err, "Creating Namespace")
	}

	key := InstanceKey{
		ID: id,
	}
	err = db.DBconn.Create(v.storeName, key, v.tagInst, dbData)
	if err != nil {
		namegenerator.Release(id)
		return InstanceResponse{}, pkgerrors.Wrap(err, "Creating Instance DB Entry")
	}

	if len(crdList) > 0 {
		log.Printf("Pre-Installing CRDs")
		_, err = k8sClient.createResources(crdList, profile.Namespace)

		if err != nil {
			return InstanceResponse{}, pkgerrors.Wrap(err, "Pre-Installing CRDs")
		}
	}

	hookClient := NewHookClient(profile.Namespace, id, v.storeName, v.tagInst)
	if len(hookClient.getHookByEvent(hookList, release.HookPreInstall)) != 0 {
		err = hookClient.ExecHook(k8sClient, hookList, release.HookPreInstall, preInstallTimeOut, 0, &dbData)
		if err != nil {
			log.Printf("Error running preinstall hooks for release %s, Error: %s. Stop here", releaseName, err)
			err2 := db.DBconn.Delete(v.storeName, key, v.tagInst)
			if err2 != nil {
				log.Printf("Error cleaning failed instance in DB, please check DB.")
			} else {
				namegenerator.Release(id)
			}
			return InstanceResponse{}, pkgerrors.Wrap(err, "Error running preinstall hooks")
		}
	}

	dbData.Status = "CREATING"
	err = db.DBconn.Update(v.storeName, key, v.tagInst, dbData)
	if err != nil {
		err2 := db.DBconn.Delete(v.storeName, key, v.tagInst)
		if err2 != nil {
			log.Printf("Delete Instance DB Entry for release %s has error.", releaseName)
		} else {
			namegenerator.Release(id)
		}
		return InstanceResponse{}, pkgerrors.Wrap(err, "Update Instance DB Entry")
	}

	//Main rss creation is supposed to be very quick -> no need to support recover for main rss
	createdResources, err := k8sClient.createResources(sortedTemplates, profile.Namespace)
	if err != nil {
		if len(createdResources) > 0 {
			log.Printf("[Instance] Reverting created resources on Error: %s", err.Error())
			k8sClient.deleteResources(helm.GetReverseK8sResources(createdResources), profile.Namespace)
		}
		log.Printf("  Instance: %s, Main rss are failed, skip post-install and remove instance in DB", id)
		//main rss creation failed -> remove instance in DB
		err2 := db.DBconn.Delete(v.storeName, key, v.tagInst)
		if err2 != nil {
			log.Printf("Delete Instance DB Entry for release %s has error.", releaseName)
		} else {
			namegenerator.Release(id)
		}
		return InstanceResponse{}, pkgerrors.Wrap(err, "Create Kubernetes Resources")
	}

	dbData.Status = "CREATED"
	dbData.Resources = createdResources
	err = db.DBconn.Update(v.storeName, key, v.tagInst, dbData)
	if err != nil {
		return InstanceResponse{}, pkgerrors.Wrap(err, "Update Instance DB Entry")
	}

	//Compose the return response
	resp := InstanceResponse{
		ID:          id,
		Request:     i,
		Namespace:   profile.Namespace,
		ReleaseName: releaseName,
		Resources:   createdResources,
		Hooks:       hookList,
	}

	if len(hookClient.getHookByEvent(hookList, release.HookPostInstall)) != 0 {
		go func() {
			dbData.Status = "POST-INSTALL"
			dbData.HookProgress = ""
			err = hookClient.ExecHook(k8sClient, hookList, release.HookPostInstall, postInstallTimeOut, 0, &dbData)
			if err != nil {
				dbData.Status = "POST-INSTALL-FAILED"
				log.Printf("  Instance: %s, Error running postinstall hooks error: %s", id, err)
			} else {
				dbData.Status = "DONE"
			}
			err = db.DBconn.Update(v.storeName, key, v.tagInst, dbData)
			if err != nil {
				log.Printf("Update Instance DB Entry for release %s has error.", releaseName)
			}
		}()
	} else {
		dbData.Status = "DONE"
		err = db.DBconn.Update(v.storeName, key, v.tagInst, dbData)
		if err != nil {
			log.Printf("Update Instance DB Entry for release %s has error.", releaseName)
		}
	}

	return resp, nil
}

// Get returns the full instance for corresponding ID
func (v *InstanceClient) GetFull(id string) (InstanceDbData, error) {
	key := InstanceKey{
		ID: id,
	}
	value, err := db.DBconn.Read(v.storeName, key, v.tagInst)
	if err != nil {
		return InstanceDbData{}, pkgerrors.Wrap(err, "Get Instance")
	}

	//value is a byte array
	if value != nil {
		resp := InstanceDbData{}
		err = db.DBconn.Unmarshal(value, &resp)
		if err != nil {
			return InstanceDbData{}, pkgerrors.Wrap(err, "Unmarshaling Instance Value")
		}
		//In case that we are communicating with an old db, some field will missing -> fill it with default value
		if resp.Status == "" {
			//For instance that is in Db -> consider it's DONE
			resp.Status = "DONE"
		}
		if resp.PreInstallTimeout == 0 {
			resp.PreInstallTimeout = 60
		}
		if resp.PostInstallTimeout == 0 {
			resp.PostInstallTimeout = 600
		}
		if resp.PreDeleteTimeout == 0 {
			resp.PreInstallTimeout = 60
		}
		if resp.PostDeleteTimeout == 0 {
			resp.PostDeleteTimeout = 600
		}
		return resp, nil
	}

	return InstanceDbData{}, pkgerrors.New("Error getting Instance")
}

// Get returns the instance for corresponding ID
func (v *InstanceClient) Get(id string) (InstanceResponse, error) {
	key := InstanceKey{
		ID: id,
	}
	value, err := db.DBconn.Read(v.storeName, key, v.tagInst)
	if err != nil {
		return InstanceResponse{}, pkgerrors.Wrap(err, "Get Instance")
	}

	//value is a byte array
	if value != nil {
		resp := InstanceResponse{}
		err = db.DBconn.Unmarshal(value, &resp)
		if err != nil {
			return InstanceResponse{}, pkgerrors.Wrap(err, "Unmarshaling Instance Value")
		}
		return resp, nil
	}

	return InstanceResponse{}, pkgerrors.New("Error getting Instance")
}

// Query returns state of instance's filtered resources
func (v *InstanceClient) Query(id, apiVersion, kind, name, labels string) (InstanceStatus, error) {

	queryClient := NewQueryClient()
	//Read the status from the DB
	key := InstanceKey{
		ID: id,
	}
	value, err := db.DBconn.Read(v.storeName, key, v.tagInst)
	if err != nil {
		return InstanceStatus{}, pkgerrors.Wrap(err, "Get Instance")
	}
	if value == nil { //value is a byte array
		return InstanceStatus{}, pkgerrors.New("Status is not available")
	}
	resResp := InstanceResponse{}
	err = db.DBconn.Unmarshal(value, &resResp)
	if err != nil {
		return InstanceStatus{}, pkgerrors.Wrap(err, "Unmarshaling Instance Value")
	}

	if labels == "" || strings.Contains(strings.ToLower(labels), config.GetConfiguration().KubernetesLabelName) == false {
		labelValue := config.GetConfiguration().KubernetesLabelName + "=" + id
		if labels != "" {
			labels = labels + ","
		}
		labels = labels + labelValue
	}

	resources, err := queryClient.Query(resResp.Namespace, resResp.Request.CloudRegion, apiVersion, kind, name, labels)
	if err != nil {
		return InstanceStatus{}, pkgerrors.Wrap(err, "Querying Resources")
	}

	resp := InstanceStatus{
		Request:         resResp.Request,
		ResourceCount:   resources.ResourceCount,
		ResourcesStatus: resources.ResourcesStatus,
	}
	return resp, nil
}

// Status returns the status for the instance
func (v *InstanceClient) Status(id string) (InstanceStatus, error) {
	//Read the status from the DB
	key := InstanceKey{
		ID: id,
	}

	value, err := db.DBconn.Read(v.storeName, key, v.tagInst)
	if err != nil {
		return InstanceStatus{}, pkgerrors.Wrap(err, "Get Instance")
	}

	//value is a byte array
	if value == nil {
		return InstanceStatus{}, pkgerrors.New("Status is not available")
	}

	resResp := InstanceDbData{}
	err = db.DBconn.Unmarshal(value, &resResp)
	if err != nil {
		return InstanceStatus{}, pkgerrors.Wrap(err, "Unmarshaling Instance Value")
	}

	k8sClient := KubernetesClient{}
	err = k8sClient.Init(resResp.Request.CloudRegion, id)
	if err != nil {
		return InstanceStatus{}, pkgerrors.Wrap(err, "Getting CloudRegion Information")
	}
	req := resResp.Request
	profile, err := rb.NewProfileClient().Get(req.RBName, req.RBVersion, req.ProfileName)
	if err != nil {
		return InstanceStatus{}, pkgerrors.New("Unable to find Profile instance status")
	}

	cumulatedErrorMsg := make([]string, 0)
	podsStatus, err := k8sClient.getPodsByLabel(resResp.Namespace)
	if err != nil {
		cumulatedErrorMsg = append(cumulatedErrorMsg, err.Error())
	}

	isReady := true
	generalStatus := make([]ResourceStatus, 0, len(resResp.Resources))
Main:
	for _, oneResource := range resResp.Resources {
		for _, pod := range podsStatus {
			if oneResource.GVK == pod.GVK && oneResource.Name == pod.Name {
				continue Main //Don't double check pods if someone decided to define pod explicitly in helm chart
			}
		}
		status, err := k8sClient.GetResourceStatus(oneResource, resResp.Namespace)
		if err != nil {
			cumulatedErrorMsg = append(cumulatedErrorMsg, err.Error())
			isReady = false
		} else {
			generalStatus = append(generalStatus, status)
			ready, err := v.checkRssStatus(oneResource, k8sClient, resResp.Namespace, status)

			if !ready || err != nil {
				isReady = false
				if err != nil {
					cumulatedErrorMsg = append(cumulatedErrorMsg, err.Error())
				}
			}
		}
	}
	generalStatus = append(generalStatus, podsStatus...)

	if profile.ExtraResourceTypes != nil && len(profile.ExtraResourceTypes) > 0 {
		queryClient := NewQueryClient()
		labelValue := config.GetConfiguration().KubernetesLabelName + "=" + id
		for _, extraType := range profile.ExtraResourceTypes {
			queryStatus, err := queryClient.Query(resResp.Namespace, resResp.Request.CloudRegion, extraType.GroupVersion().Identifier(), extraType.Kind, "", labelValue)
			if err != nil {
				return InstanceStatus{}, pkgerrors.Wrap(err, "Querying Resources")
			}
			for _, rs := range queryStatus.ResourcesStatus {
				foundRes := false
				for _, res := range generalStatus {
					if res.GVK == rs.GVK && res.Name == rs.Name {
						foundRes = true
						break
					}
				}
				if !foundRes {
					generalStatus = append(generalStatus, rs)
				}
			}
		}
	}
	//We still need to iterate through rss list even the status is not DONE, to gather status of rss + pod for the response
	resp := InstanceStatus{
		Request:         resResp.Request,
		ResourceCount:   int32(len(generalStatus)),
		Ready:           isReady && resResp.Status == "DONE",
		ResourcesStatus: generalStatus,
	}

	if len(cumulatedErrorMsg) != 0 {
		err = pkgerrors.New("Getting Resources Status:\n" +
			strings.Join(cumulatedErrorMsg, "\n"))
		return resp, err
	}
	//TODO Filter response content by requested verbosity (brief, ...)?

	return resp, nil
}

func (v *InstanceClient) checkRssStatus(rss helm.KubernetesResource, k8sClient KubernetesClient, namespace string, status ResourceStatus) (bool, error) {
	readyChecker := statuscheck.NewReadyChecker(k8sClient.clientSet, statuscheck.PausedAsReady(true), statuscheck.CheckJobs(true))
	ctx, cancel := context.WithTimeout(context.Background(), time.Duration(60)*time.Second)
	defer cancel()

	apiVersion, kind := rss.GVK.ToAPIVersionAndKind()
	log.Printf("apiVersion: %s, Kind: %s", apiVersion, kind)

	var parsedRes runtime.Object
	//TODO: Should we care about different api version for a same kind?
	switch kind {
	case "Pod":
		parsedRes = new(corev1.Pod)
	case "Job":
		parsedRes = new(batchv1.Job)
	case "Deployment":
		parsedRes = new(appsv1.Deployment)
	case "PersistentVolumeClaim":
		parsedRes = new(corev1.PersistentVolume)
	case "Service":
		parsedRes = new(corev1.Service)
	case "DaemonSet":
		parsedRes = new(appsv1.DaemonSet)
	case "StatefulSet":
		parsedRes = new(appsv1.StatefulSet)
	case "ReplicationController":
		parsedRes = new(corev1.ReplicationController)
	case "ReplicaSet":
		parsedRes = new(appsv1.ReplicaSet)
	default:
		//For not listed resource, consider ready
		return true, nil
	}

	restClient, err := k8sClient.getRestApi(apiVersion)
	if err != nil {
		return false, err
	}
	mapper := k8sClient.GetMapper()
	mapping, err := mapper.RESTMapping(schema.GroupKind{
		Group: rss.GVK.Group,
		Kind:  rss.GVK.Kind,
	}, rss.GVK.Version)
	resourceInfo := resource.Info{
		Client:          restClient,
		Mapping:         mapping,
		Namespace:       namespace,
		Name:            rss.Name,
		Source:          "",
		Object:          nil,
		ResourceVersion: "",
	}

	err = runtime.DefaultUnstructuredConverter.FromUnstructured(status.Status.Object, parsedRes)
	if err != nil {
		return false, err
	}
	resourceInfo.Object = parsedRes
	ready, err := readyChecker.IsReady(ctx, &resourceInfo)
	return ready, err
}

// List returns the instance for corresponding ID
// Empty string returns all
func (v *InstanceClient) List(rbname, rbversion, profilename string) ([]InstanceMiniResponse, error) {

	dbres, err := db.DBconn.ReadAll(v.storeName, v.tagInst)
	if err != nil || len(dbres) == 0 {
		return []InstanceMiniResponse{}, pkgerrors.Wrap(err, "Listing Instances")
	}

	var results []InstanceMiniResponse

	for key, value := range dbres {
		//value is a byte array
		if value != nil {
			resp := InstanceDbData{}
			err = db.DBconn.Unmarshal(value, &resp)
			if err != nil {
				log.Printf("[Instance] Error: %s Unmarshaling Instance: %s", err.Error(), key)
			}

			miniresp := InstanceMiniResponse{
				ID:          resp.ID,
				Request:     resp.Request,
				Namespace:   resp.Namespace,
				ReleaseName: resp.ReleaseName,
			}

			//Filter based on the accepted keys
			if len(rbname) != 0 &&
				miniresp.Request.RBName != rbname {
				continue
			}
			if len(rbversion) != 0 &&
				miniresp.Request.RBVersion != rbversion {
				continue
			}
			if len(profilename) != 0 &&
				miniresp.Request.ProfileName != profilename {
				continue
			}

			if resp.Status == "PRE-INSTALL" {
				//DO not add instance which is in pre-install phase
				continue
			}

			results = append(results, miniresp)
		}
	}

	return results, nil
}

// Find returns the instances that match the given criteria
// If version is empty, it will return all instances for a given rbName
// If profile is empty, it will return all instances for a given rbName+version
// If labelKeys are provided, the results are filtered based on that.
// It is an AND operation for labelkeys.
func (v *InstanceClient) Find(rbName string, version string, profile string, labelKeys map[string]string) ([]InstanceMiniResponse, error) {
	if rbName == "" && len(labelKeys) == 0 {
		return []InstanceMiniResponse{}, pkgerrors.New("rbName or labelkeys is required and cannot be empty")
	}

	responses, err := v.List(rbName, version, profile)
	if err != nil {
		return []InstanceMiniResponse{}, pkgerrors.Wrap(err, "Listing Instances")
	}

	ret := []InstanceMiniResponse{}

	//filter the list by labelKeys now
	for _, resp := range responses {

		add := true
		for k, v := range labelKeys {
			if resp.Request.Labels[k] != v {
				add = false
				break
			}
		}
		// If label was not found in the response, don't add it
		if add {
			ret = append(ret, resp)
		}
	}

	return ret, nil
}

// Delete the Instance from database
func (v *InstanceClient) Delete(id string) error {
	inst, err := v.GetFull(id)
	if err != nil {
		return pkgerrors.Wrap(err, "Error getting Instance")
	}
	key := InstanceKey{
		ID: id,
	}
	if inst.Status == "DELETED" {
		//The instance is deleted when the plugin comes back -> just remove from Db
		err = db.DBconn.Delete(v.storeName, key, v.tagInst)
		if err != nil {
			log.Printf("Delete Instance DB Entry for release %s has error.", inst.ReleaseName)
		}
		return nil
	} else if inst.Status != "DONE" {
		//Recover is ongoing, do nothing here
		//return nil
		//TODO: implement recovery
	}

	k8sClient := KubernetesClient{}
	err = k8sClient.Init(inst.Request.CloudRegion, inst.ID)
	if err != nil {
		return pkgerrors.Wrap(err, "Getting CloudRegion Information")
	}

	inst.Status = "PRE-DELETE"
	inst.HookProgress = ""
	err = db.DBconn.Update(v.storeName, key, v.tagInst, inst)
	if err != nil {
		log.Printf("Update Instance DB Entry for release %s has error.", inst.ReleaseName)
	}

	hookClient := NewHookClient(inst.Namespace, id, v.storeName, v.tagInst)
	if len(hookClient.getHookByEvent(inst.Hooks, release.HookPreDelete)) != 0 {
		err = hookClient.ExecHook(k8sClient, inst.Hooks, release.HookPreDelete, inst.PreDeleteTimeout, 0, &inst)
		if err != nil {
			log.Printf("  Instance: %s, Error running pre-delete hooks error: %s", id, err)
			inst.Status = "PRE-DELETE-FAILED"
			err2 := db.DBconn.Update(v.storeName, key, v.tagInst, inst)
			if err2 != nil {
				log.Printf("Update Instance DB Entry for release %s has error.", inst.ReleaseName)
			}
			return pkgerrors.Wrap(err, "Error running pre-delete hooks")
		}
	}

	inst.Status = "DELETING"
	err = db.DBconn.Update(v.storeName, key, v.tagInst, inst)
	if err != nil {
		log.Printf("Update Instance DB Entry for release %s has error.", inst.ReleaseName)
	}

	configClient := NewConfigClient()
	err = configClient.Cleanup(id)
	if err != nil {
		return pkgerrors.Wrap(err, "Cleanup Config Resources")
	}

	err = k8sClient.deleteResources(helm.GetReverseK8sResources(inst.Resources), inst.Namespace)
	if err != nil {
		return pkgerrors.Wrap(err, "Deleting Instance Resources")
	}
	if len(hookClient.getHookByEvent(inst.Hooks, release.HookPostDelete)) != 0 {
		go func() {
			inst.HookProgress = ""
			if err := v.runPostDelete(k8sClient, hookClient, &inst, 0, true); err != nil {
				log.Printf(err.Error())
			}
		}()
	} else {
		err = db.DBconn.Delete(v.storeName, key, v.tagInst)
		if err != nil {
			return pkgerrors.Wrap(err, "Delete Instance")
		}
	}

	return nil
}

//Continue the instantiation
func (v *InstanceClient) RecoverCreateOrDelete(id string) error {
	instance, err := v.GetFull(id)
	if err != nil {
		return pkgerrors.Wrap(err, "Error getting instance "+id+", skip this instance.  Error detail")
	}
	log.Printf("Instance " + id + ", status: " + instance.Status + ", HookProgress: " + instance.HookProgress)
	//have to resolve again template for this instance because all templates are in /tmp -> will be deleted when container restarts
	overrideValues := []string{}
	if instance.Request.OverrideValues != nil {
		for k, v := range instance.Request.OverrideValues {
			overrideValues = append(overrideValues, k+"="+v)
		}
	}
	key := InstanceKey{
		ID: id,
	}
	log.Printf("  Resolving template for release %s", instance.Request.ReleaseName)
	_, _, hookList, _, err := rb.NewProfileClient().Resolve(instance.Request.RBName, instance.Request.RBVersion, instance.Request.ProfileName, overrideValues, instance.Request.ReleaseName)
	instance.Hooks = hookList
	err = db.DBconn.Update(v.storeName, key, v.tagInst, instance)
	if err != nil {
		return pkgerrors.Wrap(err, "Update Instance DB Entry")
	}

	if strings.Contains(instance.Status, "FAILED") {
		log.Printf("  This instance has failed during instantiation, not going to recover")
		return nil
	} else if !strings.Contains(instance.Status, "-INSTALL") && !strings.Contains(instance.Status, "-DELETE") {
		log.Printf("  This instance is not in hook state, not going to recover")
		return nil
	}

	splitHookProgress := strings.Split(instance.HookProgress, "/")
	completedHooks, err := strconv.Atoi(splitHookProgress[0])
	if err != nil {
		return pkgerrors.Wrap(err, "Error getting completed PRE-INSTALL hooks for instance  "+instance.ID+", skip. Error detail")
	}

	//we can add an option to delete instances that will not be recovered from database to clean the db
	if (instance.Status != "POST-INSTALL") && (instance.Status != "PRE-DELETE") && (instance.Status != "POST-DELETE") {
		if instance.Status == "PRE-INSTALL" {
			//Plugin quits during pre-install hooks -> Will do nothing because from SO point of view, there's no instance ID and will be reported as fail and be rolled back
			log.Printf("  The plugin quits during pre-install hook of this instance, not going to recover")
		}
		return nil
	}
	k8sClient := KubernetesClient{}
	err = k8sClient.Init(instance.Request.CloudRegion, id)
	if err != nil {
		log.Printf("  Error getting CloudRegion %s", instance.Request.CloudRegion)
		return nil
	}
	hookClient := NewHookClient(instance.Namespace, id, v.storeName, v.tagInst)
	switch instance.Status {
	case "POST-INSTALL":
		//Plugin quits during post-install hooks -> continue
		go func() {
			log.Printf("  The plugin quits during post-install hook of this instance, continue post-install hook")
			err = hookClient.ExecHook(k8sClient, instance.Hooks, release.HookPostInstall, instance.PostInstallTimeout, completedHooks, &instance)
			log.Printf("dbData.HookProgress %s", instance.HookProgress)
			if err != nil {
				instance.Status = "POST-INSTALL-FAILED"
				log.Printf("  Instance: %s, Error running postinstall hooks error: %s", id, err)
			} else {
				instance.Status = "DONE"
			}
			err = db.DBconn.Update(v.storeName, key, v.tagInst, instance)
			if err != nil {
				log.Printf("Update Instance DB Entry for release %s has error.", instance.ReleaseName)
			}
		}()
	case "PRE-DELETE":
		//Plugin quits during pre-delete hooks -> This already effects the instance -> should continue the deletion
		go func() {
			log.Printf("  The plugin quits during pre-delete hook of this instance, continue pre-delete hook")
			err = hookClient.ExecHook(k8sClient, instance.Hooks, release.HookPreDelete, instance.PreDeleteTimeout, completedHooks, &instance)
			if err != nil {
				log.Printf("  Instance: %s, Error running pre-delete hooks error: %s", id, err)
				instance.Status = "PRE-DELETE-FAILED"
				err = db.DBconn.Update(v.storeName, key, v.tagInst, instance)
				if err != nil {
					log.Printf("Update Instance DB Entry for release %s has error.", instance.ReleaseName)
				}
				return
			}

			err = k8sClient.deleteResources(helm.GetReverseK8sResources(instance.Resources), instance.Namespace)
			if err != nil {
				log.Printf("  Error running deleting instance resources, error: %s", err)
				return
			}
			//will not delete the instance in Db to avoid error when SO call delete again and there is not instance in DB
			//the instance in DB will be deleted when SO call delete again.
			instance.HookProgress = ""
			if err := v.runPostDelete(k8sClient, hookClient, &instance, 0, false); err != nil {
				log.Printf(err.Error())
			}
		}()
	case "POST-DELETE":
		//Plugin quits during post-delete hooks -> continue
		go func() {
			log.Printf("  The plugin quits during post-delete hook of this instance, continue post-delete hook")
			if err := v.runPostDelete(k8sClient, hookClient, &instance, completedHooks, true); err != nil {
				log.Printf(err.Error())
			}
		}()
	default:
		log.Printf("  This instance is not in hook state, not going to recover")
	}

	return nil
}

func (v *InstanceClient) runPostDelete(k8sClient KubernetesClient, hookClient *HookClient, instance *InstanceDbData, startIndex int, clearDb bool) error {
	key := InstanceKey{
		ID: instance.ID,
	}
	instance.Status = "POST-DELETE"
	err := db.DBconn.Update(v.storeName, key, v.tagInst, instance)
	if err != nil {
		log.Printf("Update Instance DB Entry for release %s has error.", instance.ReleaseName)
	}
	err = hookClient.ExecHook(k8sClient, instance.Hooks, release.HookPostDelete, instance.PostDeleteTimeout, startIndex, instance)
	if err != nil {
		//If this case happen, user should clean the cluster
		log.Printf("  Instance: %s, Error running post-delete hooks error: %s", instance.ID, err)
		instance.Status = "POST-DELETE-FAILED"
		err2 := db.DBconn.Update(v.storeName, key, v.tagInst, instance)
		if err2 != nil {
			log.Printf("Update Instance DB Entry for release %s has error.", instance.ReleaseName)
			return pkgerrors.Wrap(err2, "Delete Instance DB Entry")
		}
		return pkgerrors.Wrap(err, "Error running post-delete hooks")
	}
	if clearDb {
		err = db.DBconn.Delete(v.storeName, key, v.tagInst)
		if err != nil {
			log.Printf("Delete Instance DB Entry for release %s has error.", instance.ReleaseName)
			return pkgerrors.Wrap(err, "Delete Instance DB Entry")
		}
	} else {
		instance.Status = "DELETED"
		err := db.DBconn.Update(v.storeName, key, v.tagInst, instance)
		if err != nil {
			log.Printf("Update Instance DB Entry for release %s has error.", instance.ReleaseName)
			return pkgerrors.Wrap(err, "Update Instance DB Entry")
		}
	}

	go func() {
		//Clear all hook rss that does not have delete-on-success deletion policy
		log.Printf("Clean leftover hook resource")
		var remainHookRss []helm.KubernetesResource
		for _, h := range instance.Hooks {
			res := helm.KubernetesResource{
				GVK:  h.KRT.GVK,
				Name: h.Hook.Name,
			}
			if _, err := k8sClient.GetResourceStatus(res, hookClient.kubeNameSpace); err == nil {
				remainHookRss = append(remainHookRss, res)
				log.Printf("  Rss %s will be deleted.", res.Name)
			}
		}
		if len(remainHookRss) > 0 {
			err = k8sClient.deleteResources(remainHookRss, hookClient.kubeNameSpace)
			if err != nil {
				log.Printf("Error cleaning Hook Rss, please do it manually if needed. Error: %s", err.Error())
			}
		}
	}()

	return nil
}