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transform.go
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transform.go
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
package transform
import (
"fmt"
"log"
"sort"
"strings"
"github.com/Azure/azure-sdk-for-go/services/compute/mgmt/2019-07-01/compute"
"github.com/sirupsen/logrus"
)
const (
//Field names
customDataFieldName = "customData"
dependsOnFieldName = "dependsOn"
hardwareProfileFieldName = "hardwareProfile"
imageReferenceFieldName = "imageReference"
nameFieldName = "name"
osProfileFieldName = "osProfile"
propertiesFieldName = "properties"
resourcesFieldName = "resources"
storageProfileFieldName = "storageProfile"
typeFieldName = "type"
vmSizeFieldName = "vmSize"
dataDisksFieldName = "dataDisks"
createOptionFieldName = "createOption"
tagsFieldName = "tags"
managedDiskFieldName = "managedDisk"
windowsConfigurationFieldName = "windowsConfiguration"
platformFaultDomainCountFieldName = "platformFaultDomainCount"
singlePlacementGroupFieldName = "singlePlacementGroup"
// ARM resource Types
nsgResourceType = "Microsoft.Network/networkSecurityGroups"
rtResourceType = "Microsoft.Network/routeTables"
vmResourceType = "Microsoft.Compute/virtualMachines"
vmExtensionType = "Microsoft.Compute/virtualMachines/extensions"
nicResourceType = "Microsoft.Network/networkInterfaces"
vnetResourceType = "Microsoft.Network/virtualNetworks"
vmasResourceType = "Microsoft.Compute/availabilitySets"
vmssResourceType = "Microsoft.Compute/virtualMachineScaleSets"
lbResourceType = "Microsoft.Network/loadBalancers"
// resource ids
nsgID = "nsgID"
rtID = "routeTableID"
vnetID = "vnetID"
agentLbID = "agentLbID"
)
// Translator defines all required interfaces for i18n.Translator.
type Translator interface {
// T translates a text string, based on GNU's gettext library.
T(msgid string, vars ...interface{}) string
// NT translates a text string into the appropriate plural form, based on GNU's gettext library.
NT(msgid, msgidPlural string, n int, vars ...interface{}) string
// Errorf produces an error with a translated error string.
Errorf(msgid string, vars ...interface{}) error
// NErrorf produces an error with a translated error string in the appropriate plural form.
NErrorf(msgid, msgidPlural string, n int, vars ...interface{}) error
}
// Transformer represents the object that transforms template
type Transformer struct {
Translator Translator
}
type tMap map[string]interface{}
type resource map[string]interface{}
func (t tMap) Resources(logger *logrus.Entry) []resource {
resourcesInterfaces := t[resourcesFieldName].([]interface{})
resources := make([]resource, 0)
for index, ri := range resourcesInterfaces {
if r, ok := ri.(map[string]interface{}); ok {
resources = append(resources, r)
} else {
logger.Warnf("Template improperly formatted for resource at index %d", index)
}
}
return resources
}
func (r resource) Type() string {
return r[typeFieldName].(string)
}
func (r resource) Name() string {
return r[nameFieldName].(string)
}
func (r resource) Properties() map[string]interface{} {
prop, ok := r[propertiesFieldName].(map[string]interface{})
if !ok {
return map[string]interface{}{}
}
return prop
}
func (r resource) RemoveProperty(logger *logrus.Entry, key string) {
properties := r.Properties()
_, ok := properties[key]
if ok {
logger.Infof("Removing %s property from %s", key, r.Name())
delete(properties, key)
}
}
func (r resource) removeDependencyType(logger *logrus.Entry, depType string) []string {
deps := r.DependsOn()
var newDependsOn []string
for _, dep := range deps {
depVal := dep.(string)
if !strings.Contains(depVal, depType) {
logger.Infof("Removing %s dependency from %s", depType, r.Name())
newDependsOn = append(newDependsOn, depVal)
}
}
return newDependsOn
}
func (r resource) DependsOn() []interface{} {
deps, ok := r[dependsOnFieldName].([]interface{})
if !ok {
return []interface{}{}
}
return deps
}
func (t *Transformer) RemoveImmutableResourceProperties(logger *logrus.Entry, templateMap map[string]interface{}) {
tm := tMap(templateMap)
for _, resource := range tm.Resources(logger) {
if resource.Type() == vmssResourceType {
resource.RemoveProperty(logger, platformFaultDomainCountFieldName)
resource.RemoveProperty(logger, singlePlacementGroupFieldName)
}
}
}
// NormalizeForK8sSLBScalingOrUpgrade takes a template and removes elements that are unwanted in a K8s Standard LB cluster scale up/down case
func (t *Transformer) NormalizeForK8sSLBScalingOrUpgrade(logger *logrus.Entry, templateMap map[string]interface{}) error {
logger.Debugf("Running NormalizeForK8sSLBScalingOrUpgrade...")
lbIndex := -1
resources := templateMap[resourcesFieldName].([]interface{})
for index, resource := range resources {
resourceMap, ok := resource.(map[string]interface{})
if !ok {
logger.Warnf("Template improperly formatted for resource")
continue
}
resourceType, ok := resourceMap[typeFieldName].(string)
resourceName := resourceMap[nameFieldName].(string)
// remove agentLB if found
if ok && resourceType == lbResourceType && strings.Contains(resourceName, "variables('agentLbName')") {
lbIndex = index
}
// remove agentLB from dependsOn if found
dependencies, ok := resourceMap[dependsOnFieldName].([]interface{})
if !ok {
continue
}
for dIndex := len(dependencies) - 1; dIndex >= 0; dIndex-- {
dependency := dependencies[dIndex].(string)
if strings.Contains(dependency, lbResourceType) || strings.Contains(dependency, agentLbID) {
dependencies = append(dependencies[:dIndex], dependencies[dIndex+1:]...)
}
}
if len(dependencies) > 0 {
resourceMap[dependsOnFieldName] = dependencies
} else {
delete(resourceMap, dependsOnFieldName)
}
}
indexesToRemove := []int{}
if lbIndex != -1 {
indexesToRemove = append(indexesToRemove, lbIndex)
}
templateMap[resourcesFieldName] = removeIndexesFromArray(resources, indexesToRemove)
return nil
}
// NormalizeForK8sVMASScalingUp takes a template and removes elements that are unwanted in a K8s VMAS scale up/down case
func (t *Transformer) NormalizeForK8sVMASScalingUp(logger *logrus.Entry, templateMap map[string]interface{}) error {
if err := t.NormalizeMasterResourcesForScaling(logger, templateMap); err != nil {
return err
}
rtIndex := -1
nsgIndex := -1
vnetIndex := -1
vmasIndexes := make([]int, 0)
resources := templateMap[resourcesFieldName].([]interface{})
for index, resource := range resources {
resourceMap, ok := resource.(map[string]interface{})
if !ok {
logger.Warnf("Template improperly formatted for resource")
continue
}
resourceType, ok := resourceMap[typeFieldName].(string)
resourceName := resourceMap[nameFieldName].(string)
if ok && resourceType == nsgResourceType && !strings.Contains(resourceName, "variables('jumpboxNetworkSecurityGroupName')") {
if nsgIndex != -1 {
err := t.Translator.Errorf("Found 2 resources with type %s in the template. There should only be 1", nsgResourceType)
logger.Errorf(err.Error())
return err
}
nsgIndex = index
}
if ok && resourceType == rtResourceType {
if rtIndex != -1 {
err := t.Translator.Errorf("Found 2 resources with type %s in the template. There should only be 1", rtResourceType)
logger.Warnf(err.Error())
return err
}
rtIndex = index
}
if ok && resourceType == vnetResourceType {
if vnetIndex != -1 {
err := t.Translator.Errorf("Found 2 resources with type %s in the template. There should only be 1", vnetResourceType)
logger.Warnf(err.Error())
return err
}
vnetIndex = index
}
if ok && resourceType == vmasResourceType {
// All availability sets can be removed
vmasIndexes = append(vmasIndexes, index)
}
dependencies, ok := resourceMap[dependsOnFieldName].([]interface{})
if !ok {
continue
}
for dIndex := len(dependencies) - 1; dIndex >= 0; dIndex-- {
dependency := dependencies[dIndex].(string)
if strings.Contains(dependency, nsgResourceType) || strings.Contains(dependency, nsgID) ||
strings.Contains(dependency, rtResourceType) || strings.Contains(dependency, rtID) ||
strings.Contains(dependency, vnetResourceType) || strings.Contains(dependency, vnetID) ||
strings.Contains(dependency, vmasResourceType) {
dependencies = append(dependencies[:dIndex], dependencies[dIndex+1:]...)
}
}
if len(dependencies) > 0 {
resourceMap[dependsOnFieldName] = dependencies
} else {
delete(resourceMap, dependsOnFieldName)
}
}
indexesToRemove := []int{}
if rtIndex == -1 {
logger.Debugf("Found no resources with type %s in the template.", rtResourceType)
} else {
indexesToRemove = append(indexesToRemove, rtIndex)
}
if vnetIndex != -1 {
indexesToRemove = append(indexesToRemove, vnetIndex)
}
if len(vmasIndexes) != 0 {
indexesToRemove = append(indexesToRemove, vmasIndexes...)
}
if nsgIndex > 0 {
indexesToRemove = append(indexesToRemove, nsgIndex)
}
templateMap[resourcesFieldName] = removeIndexesFromArray(resources, indexesToRemove)
return nil
}
func removeIndexesFromArray(array []interface{}, indexes []int) []interface{} {
sort.Sort(sort.Reverse(sort.IntSlice(indexes)))
for _, index := range indexes {
array = append(array[:index], array[index+1:]...)
}
return array
}
// NormalizeMasterResourcesForScaling takes a template and removes elements that are unwanted in any scale up/down case
func (t *Transformer) NormalizeMasterResourcesForScaling(logger *logrus.Entry, templateMap map[string]interface{}) error {
resources := templateMap[resourcesFieldName].([]interface{})
indexesToRemove := []int{}
//update master nodes resources
for index, resource := range resources {
resourceMap, ok := resource.(map[string]interface{})
if !ok {
logger.Warnf("Template improperly formatted")
continue
}
resourceType, ok := resourceMap[typeFieldName].(string)
if !ok || resourceType != vmResourceType {
var resourceName string
resourceName, ok = resourceMap[nameFieldName].(string)
if !ok {
logger.Warnf("Template improperly formatted")
continue
}
if strings.Contains(resourceName, "variables('masterVMNamePrefix')") && resourceType == vmExtensionType {
indexesToRemove = append(indexesToRemove, index)
}
continue
}
resourceName, ok := resourceMap[nameFieldName].(string)
if !ok {
logger.Warnf("Template improperly formatted")
continue
}
// make sure this is only modifying the master vms
if !strings.Contains(resourceName, "variables('masterVMNamePrefix')") {
continue
}
resourceProperties, ok := resourceMap[propertiesFieldName].(map[string]interface{})
if !ok {
logger.Warnf("Template improperly formatted")
continue
}
hardwareProfile, ok := resourceProperties[hardwareProfileFieldName].(map[string]interface{})
if !ok {
logger.Warnf("Template improperly formatted")
continue
}
if hardwareProfile[vmSizeFieldName] != nil {
delete(hardwareProfile, vmSizeFieldName)
}
if !t.removeCustomData(logger, resourceProperties) || !t.removeDataDisks(logger, resourceProperties) || !t.removeImageReference(logger, resourceProperties) {
continue
}
}
templateMap[resourcesFieldName] = removeIndexesFromArray(resources, indexesToRemove)
return nil
}
func (t *Transformer) removeCustomData(logger *logrus.Entry, resourceProperties map[string]interface{}) bool {
osProfile, ok := resourceProperties[osProfileFieldName].(map[string]interface{})
if !ok {
logger.Warnf("Template improperly formatted")
return ok
}
if osProfile[customDataFieldName] != nil && osProfile[windowsConfigurationFieldName] == nil {
delete(osProfile, customDataFieldName)
}
return ok
}
func (t *Transformer) removeDataDisks(logger *logrus.Entry, resourceProperties map[string]interface{}) bool {
storageProfile, ok := resourceProperties[storageProfileFieldName].(map[string]interface{})
if !ok {
logger.Warnf("Template improperly formatted. Could not find: %s", storageProfileFieldName)
return ok
}
if storageProfile[dataDisksFieldName] != nil {
delete(storageProfile, dataDisksFieldName)
}
return ok
}
func (t *Transformer) removeImageReference(logger *logrus.Entry, resourceProperties map[string]interface{}) bool {
storageProfile, ok := resourceProperties[storageProfileFieldName].(map[string]interface{})
if !ok {
logger.Warnf("Template improperly formatted. Could not find: %s", storageProfileFieldName)
return ok
}
if storageProfile[imageReferenceFieldName] != nil {
delete(storageProfile, imageReferenceFieldName)
}
return ok
}
// NormalizeResourcesForK8sMasterUpgrade takes a template and removes elements that are unwanted in any scale up/down case
func (t *Transformer) NormalizeResourcesForK8sMasterUpgrade(logger *logrus.Entry, templateMap map[string]interface{}, isMasterManagedDisk bool, agentPoolsToPreserve map[string]bool) error {
resources := templateMap[resourcesFieldName].([]interface{})
resourceTypeToProcess := map[string]bool{vmResourceType: true, vmExtensionType: true,
nicResourceType: true, vnetResourceType: true, nsgResourceType: true,
lbResourceType: true, vmssResourceType: true, vmasResourceType: true}
logger.Infoln(fmt.Sprintf("Resource count before running NormalizeResourcesForK8sMasterUpgrade: %d", len(resources)))
filteredResources := resources[:0]
// remove agent nodes resources if needed and set dataDisk createOption to attach
for _, resource := range resources {
filteredResources = append(filteredResources, resource)
resourceMap, ok := resource.(map[string]interface{})
if !ok {
logger.Warnf("Template improperly formatted for field name: %s", resourcesFieldName)
continue
}
resourceType, ok := resourceMap[typeFieldName].(string)
if !ok {
continue
}
_, process := resourceTypeToProcess[resourceType]
if !process {
continue
}
filteredResources = removeVMAS(logger, filteredResources, resourceMap)
resourceName, ok := resourceMap[nameFieldName].(string)
if !ok {
logger.Warnf("Template improperly formatted for field name: %s", nameFieldName)
continue
}
if resourceType == vmssResourceType || resourceType == vnetResourceType {
RemoveNsgDependency(logger, resourceName, resourceMap)
continue
}
if resourceType == lbResourceType {
if strings.Contains(resourceName, "variables('masterInternalLbName')") {
RemoveNsgDependency(logger, resourceName, resourceMap)
continue
}
}
if resourceType == nicResourceType {
RemoveNsgDependency(logger, resourceName, resourceMap)
if strings.Contains(resourceName, "variables('masterVMNamePrefix')") {
continue
} else {
// Remove agent NICs if upgrade master nodes
if agentPoolsToPreserve == nil {
logger.Infoln(fmt.Sprintf("Removing nic: %s from template", resourceName))
if len(filteredResources) > 0 {
filteredResources = filteredResources[:len(filteredResources)-1]
}
}
continue
}
}
if strings.EqualFold(resourceType, vmResourceType) &&
strings.Contains(resourceName, "variables('masterVMNamePrefix')") {
resourceProperties, ok := resourceMap[propertiesFieldName].(map[string]interface{})
if !ok {
logger.Warnf("Template improperly formatted for field name: %s, resource name: %s", propertiesFieldName, resourceName)
continue
}
storageProfile, ok := resourceProperties[storageProfileFieldName].(map[string]interface{})
if !ok {
logger.Warnf("Template improperly formatted: %s", storageProfileFieldName)
continue
}
dataDisks, ok := storageProfile[dataDisksFieldName].([]interface{})
if !ok {
logger.Warnf("Template improperly formatted for field name: %s, property name: %s", storageProfileFieldName, dataDisksFieldName)
continue
}
dataDisk, ok := dataDisks[0].(map[string]interface{})
if !ok {
logger.Warnf("Template improperly formatted for field name: %s, there is no data disks defined", dataDisksFieldName)
continue
}
dataDisk[createOptionFieldName] = "attach"
if isMasterManagedDisk {
managedDisk := compute.ManagedDiskParameters{}
id := "[concat('/subscriptions/', variables('subscriptionId'), '/resourceGroups/', variables('resourceGroup'),'/providers/Microsoft.Compute/disks/', variables('masterVMNamePrefix'), copyIndex(variables('masterOffset')),'-etcddisk')]"
managedDisk.ID = &id
diskInterface := &managedDisk
dataDisk[managedDiskFieldName] = diskInterface
}
}
tags, _ := resourceMap[tagsFieldName].(map[string]interface{})
poolName := fmt.Sprint(tags["poolName"]) // poolName tag exists on agents only
if resourceType == vmResourceType {
logger.Infoln(fmt.Sprintf("Evaluating if agent pool: %s, resource: %s needs to be removed", poolName, resourceName))
// Not an agent (could be a master VM)
if tags["poolName"] == nil || strings.Contains(resourceName, "variables('masterVMNamePrefix')") {
continue
}
logger.Infoln(fmt.Sprintf("agentPoolsToPreserve: %v...", agentPoolsToPreserve))
if len(agentPoolsToPreserve) == 0 || !agentPoolsToPreserve[poolName] {
logger.Infoln(fmt.Sprintf("Removing agent pool: %s, resource: %s from template", poolName, resourceName))
if len(filteredResources) > 0 {
filteredResources = filteredResources[:len(filteredResources)-1]
}
}
} else if resourceType == vmExtensionType {
logger.Infoln(fmt.Sprintf("Evaluating if extension: %s needs to be removed", resourceName))
if strings.Contains(resourceName, "variables('masterVMNamePrefix')") {
continue
}
logger.Infoln(fmt.Sprintf("agentPoolsToPreserve: %v...", agentPoolsToPreserve))
removeExtension := true
for poolName, preserve := range agentPoolsToPreserve {
if strings.Contains(resourceName, "variables('"+poolName) && preserve {
removeExtension = false
}
}
if removeExtension {
logger.Infoln(fmt.Sprintf("Removing extension: %s from template", resourceName))
if len(filteredResources) > 0 {
filteredResources = filteredResources[:len(filteredResources)-1]
}
}
} else if resourceType == nsgResourceType {
logger.Infoln(fmt.Sprintf("Removing nsg resource: %s from template", resourceName))
{
if len(filteredResources) > 0 {
filteredResources = filteredResources[:len(filteredResources)-1]
}
}
}
}
templateMap[resourcesFieldName] = filteredResources
logger.Infoln(fmt.Sprintf("Resource count after running NormalizeResourcesForK8sMasterUpgrade: %d",
len(templateMap[resourcesFieldName].([]interface{}))))
return nil
}
func removeVMAS(logger *logrus.Entry, resources []interface{}, resource resource) []interface{} {
// remove vmas
if strings.EqualFold(resource.Type(), vmasResourceType) {
return resources[:len(resources)-1]
}
// remove dependencies on vmas
if strings.EqualFold(resource.Type(), vmResourceType) {
resource[dependsOnFieldName] = resource.removeDependencyType(logger, vmasResourceType)
}
return resources
}
//RemoveNsgDependency Removes the nsg dependency from the resource
func RemoveNsgDependency(logger *logrus.Entry, resourceName string, resourceMap map[string]interface{}) {
if resourceName != "" && resourceMap != nil {
dependencies, ok := resourceMap[dependsOnFieldName].([]interface{})
if !ok {
logger.Warnf("Could not find dependencies for resourceName: %s", resourceName)
return
}
for dIndex := len(dependencies) - 1; dIndex >= 0; dIndex-- {
dependency := dependencies[dIndex].(string)
if strings.Contains(dependency, nsgResourceType) || strings.Contains(dependency, nsgID) {
dependencies = append(dependencies[:dIndex], dependencies[dIndex+1:]...)
}
}
if len(dependencies) > 0 {
resourceMap[dependsOnFieldName] = dependencies
} else {
delete(resourceMap, dependsOnFieldName)
}
return
}
}
// NormalizeResourcesForK8sAgentUpgrade takes a template and removes elements that are unwanted in any scale/upgrade case
func (t *Transformer) NormalizeResourcesForK8sAgentUpgrade(logger *logrus.Entry, templateMap map[string]interface{}, isMasterManagedDisk bool, agentPoolsToPreserve map[string]bool) error {
logger.Infoln(fmt.Sprintf("Running NormalizeResourcesForK8sMasterUpgrade...."))
if err := t.NormalizeResourcesForK8sMasterUpgrade(logger, templateMap, isMasterManagedDisk, agentPoolsToPreserve); err != nil {
log.Fatalln(err)
return err
}
logger.Infoln(fmt.Sprintf("Running NormalizeForK8sVMASScalingUp...."))
if err := t.NormalizeForK8sVMASScalingUp(logger, templateMap); err != nil {
log.Fatalln(err)
return err
}
return nil
}