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azure-deprovisioner.go
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azure-deprovisioner.go
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package steps
import (
"log"
"time"
"github.com/kubernetes-incubator/service-catalog/pkg/apis/servicecatalog/v1beta1"
installationConfig "github.com/kyma-project/kyma/components/installer/pkg/config"
internalerrors "github.com/kyma-project/kyma/components/installer/pkg/errors"
serviceCatalog "github.com/kyma-project/kyma/components/installer/pkg/servicecatalog"
)
// For now we're only interested in these
var azureBrokerServiceClasses = map[string]string{
"fb9bc99e-0aa9-11e6-8a8a-000d3a002ed5": "azure-sqldb",
"997b8372-8dac-40ac-ae65-758b4a5075a5": "azure-mysqldb",
"0346088a-d4b2-4478-aa32-f18e295ec1d9": "azure-rediscache",
}
// DeprovisionConfig is used to parametrize deprovisioning of Azure Resources
type DeprovisionConfig struct {
BindingDeleteMaxReps int
BindingDeleteSleepTime int
InstanceDeleteMaxReps int
InstanceDeleteSleepTime int
}
// DefaultDeprovisionConfig returns default config for deprovisioning Azure Resources
func DefaultDeprovisionConfig() *DeprovisionConfig {
res := DeprovisionConfig{
BindingDeleteMaxReps: 3, //times
BindingDeleteSleepTime: 3, //seconds
InstanceDeleteMaxReps: 20, //times
InstanceDeleteSleepTime: 15, //seconds
}
return &res
}
// DeprovisionAzureResources performs automatic removal of all resources created with Azure Broker.
func (steps *InstallationSteps) DeprovisionAzureResources(config *DeprovisionConfig, installation installationConfig.InstallationContext) error {
const stepName string = "Deprovisioning Azure Broker resources"
steps.PrintInstallationStep(stepName)
steps.statusManager.InProgress(stepName)
if config == nil {
config = DefaultDeprovisionConfig()
}
d := deprovisioner{
config: config,
serviceCatalog: steps.serviceCatalog,
errorHandlers: steps.errorHandlers,
}
if err := d.deprovision(); err != nil {
return err
}
log.Println(stepName + "...DONE")
return nil
}
type deprovisioner struct {
config *DeprovisionConfig
serviceCatalog serviceCatalog.ClientInterface
errorHandlers internalerrors.ErrorHandlersInterface
}
func (d deprovisioner) deprovision() error {
const allNamespaces = "" //empty string == all namespaces
instancesList, err := d.serviceCatalog.GetServiceInstances(allNamespaces)
if d.errorHandlers.CheckError("Error while getting Service Instances: ", err) {
return err
}
azureInstances := filterAzureBrokerInstances(instancesList.Items)
bindingsList, err := d.serviceCatalog.GetServiceBindings(allNamespaces)
if d.errorHandlers.CheckError("Error while getting Service Bindings: ", err) {
return err
}
azureBindings := filterAzureBrokerBindings(azureInstances, bindingsList.Items)
//First, delete all bindings
if len(azureBindings) > 0 {
err = d.deleteBindings(azureBindings)
d.errorHandlers.LogError("An error occurred during deleting Service Bindings: ", err)
} else {
log.Println("--> No Service Bindings found!")
}
//Then delete all instances
if len(azureInstances) > 0 {
err = d.deleteInstances(azureInstances)
if d.errorHandlers.CheckError("An error occurred during deleting Service Instances: ", err) {
return err
}
} else {
log.Println("--> No Service Instances found!")
}
return err
}
//deleteBindings tries to delete provided objects and waits for completion
func (d deprovisioner) deleteBindings(bindings []v1beta1.ServiceBinding) error {
log.Println("--> Deleting Service Bindings...")
deletedBindings := []v1beta1.ServiceBinding{}
for _, binding := range bindings {
log.Printf("----> Deleting Service Binding: [%s/%s], Service Instance: %s\n", binding.Namespace, binding.Name, binding.Spec.ServiceInstanceRef.Name)
err := d.serviceCatalog.DeleteBinding(binding.Namespace, binding.Name)
if !d.errorHandlers.CheckError("----> An error occurred during deleting Service Binding: ", err) {
deletedBindings = append(deletedBindings, binding)
}
}
if len(deletedBindings) > 0 {
log.Println("----> Waiting until all Service Bindings are deleted...")
//Bindings are quite fast to delete
time.Sleep(time.Second * time.Duration(d.config.BindingDeleteSleepTime))
//Wait for bindings to disappear
bindingsTest := func() (bool, error) {
return d.bindingsExist(deletedBindings)
}
waitUntilExists(d.config.BindingDeleteMaxReps, d.config.BindingDeleteSleepTime, bindingsTest, "Service Binding")
} else {
log.Println("--> Warning! No Service Bindings were deleted...")
}
return nil
}
//deleteInstances tries to delete provided objects and waits for completion
func (d deprovisioner) deleteInstances(instances []v1beta1.ServiceInstance) error {
log.Println("--> Deleting Service Instances...")
deletedInstances := []v1beta1.ServiceInstance{}
for _, instance := range instances {
log.Printf("----> Deleting Service Instance: [%s/%s]\n", instance.Namespace, instance.Name)
err := d.serviceCatalog.DeleteInstance(instance.Namespace, instance.Name)
if !d.errorHandlers.CheckError("----> An error occurred during deleting Service Instance: ", err) {
deletedInstances = append(deletedInstances, instance)
}
}
if len(deletedInstances) > 0 {
log.Println("----> Waiting until all Service Instances are deleted...")
//Instances take long time to delete
time.Sleep(time.Second * time.Duration(d.config.InstanceDeleteSleepTime))
//Wait for instances to disappear
instancesTest := func() (bool, error) {
return d.instancesExist(deletedInstances)
}
waitUntilExists(d.config.InstanceDeleteMaxReps, d.config.InstanceDeleteSleepTime, instancesTest, "Service Instance")
} else {
log.Println("----> Warning! No Service Instances were deleted...")
}
return nil
}
// maxReps: maximum number of loop repetitions
// waitTime: time to wait between repetitions (seconds)
// existsFunc: function that returns true if the resource still exists
func waitUntilExists(maxReps, waitTime int, existsFunc func() (bool, error), typeName string) {
for i := 0; i < maxReps; i++ {
exists, err := existsFunc()
if err != nil {
log.Println("--> An error occured while checking if "+typeName+" exists: ", err)
} else {
if !exists {
log.Printf("----> No more %s(s) exist!\n", typeName)
return
}
}
if i < maxReps {
log.Printf("----> Some %s(s) still exist, keep waiting... (done: %v/%v)\n", typeName, i+1, maxReps)
time.Sleep(time.Second * time.Duration(waitTime))
}
}
log.Printf("----> Warning! Some %s(s) still exist, manual cleanup may be required!\n", typeName)
}
func (d deprovisioner) instancesExist(deletedInstances []v1beta1.ServiceInstance) (bool, error) {
stillExists := func(existing *v1beta1.ServiceInstance) bool {
for _, deletedInstance := range deletedInstances {
if deletedInstance.UID == existing.UID {
return true
}
}
return false
}
findRes, err := d.serviceCatalog.GetServiceInstances("")
if err != nil {
return false, err
}
result := false
if len(findRes.Items) > 0 {
for _, existing := range findRes.Items {
if stillExists(&existing) {
log.Printf("------> Service Instance: [%s/%s] still exists!\n", existing.Namespace, existing.Name)
result = true
}
}
}
return result, nil
}
func (d deprovisioner) bindingsExist(deletedBindings []v1beta1.ServiceBinding) (bool, error) {
stillExists := func(existing *v1beta1.ServiceBinding) bool {
for _, deletedBinding := range deletedBindings {
if deletedBinding.UID == existing.UID {
return true
}
}
return false
}
findRes, err := d.serviceCatalog.GetServiceBindings("")
if err != nil {
return false, err
}
result := false
if len(findRes.Items) > 0 {
for _, existing := range findRes.Items {
if stillExists(&existing) {
log.Printf("------> Service Binding: [%s/%s] still exists!\n", existing.Namespace, existing.Name)
result = true
}
}
}
return result, nil
}
//Filters given ServiceInstance slice, returning only those managed by Azure Broker
func filterAzureBrokerInstances(items []v1beta1.ServiceInstance) []v1beta1.ServiceInstance {
res := []v1beta1.ServiceInstance{}
for _, item := range items {
if azureBrokerServiceClasses[item.Spec.ClusterServiceClassRef.Name] != "" {
res = append(res, item)
}
}
return res
}
//Filters given ServiceBinding slice, returning only those managed by Azure Broker
//Since ServiceBinding objects don't have any metadata related to the Broker, we have to find corresponding ServiceInstance object.
func filterAzureBrokerBindings(azureBrokerInstances []v1beta1.ServiceInstance, bindings []v1beta1.ServiceBinding) []v1beta1.ServiceBinding {
res := []v1beta1.ServiceBinding{}
isAzureBrokerBinding := func(binding v1beta1.ServiceBinding) bool {
for _, instance := range azureBrokerInstances {
//ServiceInstanceRef is LocalObjectReference (same namespace)
if instance.Name == binding.Spec.ServiceInstanceRef.Name {
return true
}
}
return false
}
for _, binding := range bindings {
if isAzureBrokerBinding(binding) {
res = append(res, binding)
}
}
return res
}