/
resource.go
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/
resource.go
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// Copyright 2022 Google LLC
//
// 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 krmtotf
import (
"fmt"
"reflect"
"strings"
corekccv1alpha1 "github.com/GoogleCloudPlatform/k8s-config-connector/pkg/apis/core/v1alpha1"
"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/k8s"
"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/servicemapping/servicemappingloader"
"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/text"
tfschema "github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// Resource is a wrapper around k8s.Resource and adds information regarding its
// corresponding Terraform resource and maintains an original copy of the
// k8s.Resource.
type Resource struct {
k8s.Resource `json:",inline"`
Original *k8s.Resource `json:"-"`
// Fields related to TF provider processing
TFInfo *terraform.InstanceInfo `json:"-"`
ResourceConfig corekccv1alpha1.ResourceConfig `json:"-"`
TFResource *tfschema.Resource `json:"-"`
}
// NewResource returns a Resource, populating the Resource information from u.Kind,
// using the structs found in sm and p.
func NewResource(u *unstructured.Unstructured, sm *corekccv1alpha1.ServiceMapping, p *tfschema.Provider) (*Resource, error) {
rc, err := servicemappingloader.GetResourceConfig(sm, u)
if err != nil {
return nil, err
}
resource, err := NewResourceFromResourceConfig(rc, p)
if err != nil {
return nil, err
}
r, err := k8s.NewResource(u)
if err != nil {
return nil, err
}
resource.Resource = *r
// Intentionally re-create the K8s resource to create a separate copy.
resource.Original, err = k8s.NewResource(u)
if err != nil {
return nil, err
}
if err := resource.ValidateResourceIDIfSupported(); err != nil {
return nil, err
}
return resource, nil
}
func NewResourceFromResourceConfig(rc *corekccv1alpha1.ResourceConfig, p *tfschema.Provider) (*Resource, error) {
tfResource, ok := p.ResourcesMap[rc.Name]
if !ok {
return nil, fmt.Errorf("error getting TF resource: unknown resource %v", rc.Name)
}
resource := &Resource{
TFInfo: &terraform.InstanceInfo{
Type: rc.Name,
},
ResourceConfig: *rc,
TFResource: tfResource,
}
return resource, nil
}
func getServerGeneratedIDFromStatus(rc *corekccv1alpha1.ResourceConfig, gvk schema.GroupVersionKind, status map[string]interface{}) (string, bool, error) {
statusOrObservedState := status
if k8s.OutputOnlyFieldsAreUnderObservedState(gvk) {
statusOrObservedState = getObservedStateFromStatus(status)
}
splitPath := text.SnakeCaseStrsToLowerCamelCaseStrs(
strings.Split(rc.ServerGeneratedIDField, "."))
return unstructured.NestedString(statusOrObservedState, splitPath...)
}
// DeepCopyObject is needed to implement the interface of client.Object.
func (r *Resource) DeepCopyObject() runtime.Object {
panic("unexpected call to resource.DeepCopyObject(...)")
}
func (r *Resource) ValidateResourceIDIfSupported() error {
if !SupportsResourceIDField(&r.ResourceConfig) {
return nil
}
_, err := r.IsResourceIDConfigured()
if err != nil {
return fmt.Errorf("error validating '%s' field: %w", k8s.ResourceIDFieldPath, err)
}
return nil
}
func (r *Resource) ConstructServerGeneratedIDInStatusFromResourceID(c client.Client, smLoader *servicemappingloader.ServiceMappingLoader) (string, error) {
resourceID, foundInSpec, err := unstructured.NestedString(r.Spec, k8s.ResourceIDFieldName)
if err != nil {
return "", fmt.Errorf("error getting '%s': %w",
k8s.ResourceIDFieldPath, err)
}
if !foundInSpec {
return "", nil
}
if foundInSpec && resourceID == "" {
return "", fmt.Errorf("the value of '%s' is invalid: '' (empty "+
"string)", k8s.ResourceIDFieldPath)
}
resourceID, err = ResolveValueTemplate(
r.ResourceConfig.ResourceID.ValueTemplate, resourceID, r, c, smLoader)
if err != nil {
return "", fmt.Errorf("error expanding resource ID: %w", err)
}
return resourceID, nil
}
func (r *Resource) SelfLinkAsID() (string, error) {
selfLink, found, err := unstructured.NestedString(r.GetStatusOrObservedState(), k8s.SelfLinkFieldName)
if err != nil {
return "", fmt.Errorf("error getting '%s': %w",
k8s.SelfLinkFieldName, err)
}
if !found {
return "", fmt.Errorf("resource %s doesn't have a '%s' field", r.Name, k8s.SelfLinkFieldName)
}
return selfLink, nil
}
// GetImportID returns the Terraform import ID for the resource.
// TODO(kcc-eng): Require ID templates for all resources and remove all implicit defaults.
func (r *Resource) GetImportID(c client.Client, smLoader *servicemappingloader.ServiceMappingLoader) (string, error) {
template := r.ResourceConfig.IDTemplate
if r.HasServerGeneratedIDField() {
// when using a server generated id for import, ensure it is there before importing to get a more specific
// error of type ServerGeneratedIDNotFoundError
if template == "" {
template = r.serverGeneratedIDToTemplate()
if _, err := r.GetServerGeneratedID(); err != nil {
return "", err
}
} else if r.serverGeneratedIDInIDTemplate() {
if _, err := r.GetServerGeneratedID(); err != nil {
return "", err
}
}
} else {
if template == "" {
template = fmt.Sprintf("{{project?}}/{{%v}}", r.ResourceConfig.MetadataMapping.Name)
}
}
value, err := expandTemplate(template, r, c, smLoader)
if err != nil {
// Some resources, e.g. Project, have (1) a server-generated ID and (2)
// an ID template that doesn't contain the server-generated ID in it.
// And they can be imported by either (1) or (2). The following if block
// is to get import ID via (1) after failing to resolve (2).
if r.shouldFallBackToServerGeneratedIDIfImportIDFails() {
template = r.serverGeneratedIDToTemplate()
return expandTemplate(template, r, c, smLoader)
}
return "", err
}
return value, nil
}
func (r *Resource) HasIDTemplate() bool {
return r.ResourceConfig.IDTemplate != ""
}
func (r *Resource) HasServerGeneratedIDField() bool {
return r.ResourceConfig.ServerGeneratedIDField != ""
}
func (r *Resource) serverGeneratedIDToTemplate() string {
return ServerGeneratedIDToTemplate(&r.ResourceConfig)
}
func (r *Resource) shouldFallBackToServerGeneratedIDIfImportIDFails() bool {
return r.HasServerGeneratedIDField() && !r.serverGeneratedIDInIDTemplate()
}
func (r *Resource) serverGeneratedIDInIDTemplate() bool {
if !r.HasIDTemplate() || !r.HasServerGeneratedIDField() {
return false
}
idTemplateFormOfServerGeneratedID := fmt.Sprintf("{{%v}}", r.ResourceConfig.ServerGeneratedIDField)
return strings.Contains(r.ResourceConfig.IDTemplate, idTemplateFormOfServerGeneratedID)
}
// GetServerGeneratedID gets the value of the resource's server-generated ID.
// There are two cases:
// (1) If the resource supports a server-generated `spec.resourceID`, return
//
// its value if specified. If unspecified, continue to case (2) but
// extract out the resource ID segment from the server-generated ID field
// using the value template of the resource ID field.
//
// (2) If the resource doesn't support a server-generated `spec.resourceID`
//
// field, then look up the field defined in ResourceConfig.ServerGeneratedIDField
// in `status` and return its value. Note: this value is not a resource ID,
// but a raw value in the status field.
func (r *Resource) GetServerGeneratedID() (string, error) {
if SupportsResourceIDField(&r.ResourceConfig) && IsResourceIDFieldServerGenerated(&r.ResourceConfig) {
id, exists, err := unstructured.NestedString(r.Spec, k8s.ResourceIDFieldName)
if err != nil {
return "", fmt.Errorf("error getting server-generated resource ID: %w", err)
}
if exists {
if id == "" {
return "", fmt.Errorf("invalid empty value for \"spec.%s\"",
k8s.ResourceIDFieldName)
}
return id, nil
}
}
// If the resource doesn't support a server-generated `spec.resourceID` or
// if the field is not specified, fallback to resolve it from status.
idInStatus, exists, err := getServerGeneratedIDFromStatus(&r.ResourceConfig, r.GroupVersionKind(), r.Status)
if err != nil {
return "", fmt.Errorf("error getting server-generated ID: %w", err)
}
if !exists {
return "", k8s.NewServerGeneratedIDNotFoundError(r.GroupVersionKind(),
k8s.GetNamespacedName(r))
}
if idInStatus == "" {
return "", fmt.Errorf("invalid empty value for \"status.%s\"",
text.SnakeCaseToLowerCamelCase(r.ResourceConfig.ServerGeneratedIDField))
}
if SupportsResourceIDField(&r.ResourceConfig) && IsResourceIDFieldServerGenerated(&r.ResourceConfig) {
id, err := extractValueSegmentFromIDInStatus(idInStatus,
r.ResourceConfig.ResourceID.ValueTemplate)
if err != nil {
return "", fmt.Errorf("error getting server-generated "+
"resource ID from the value of '%s': %w", fmt.Sprintf("status.%s",
text.SnakeCaseToLowerCamelCase(r.ResourceConfig.ServerGeneratedIDField)), err)
}
if id == "" {
return "", fmt.Errorf("invalid empty value for server-generated resource ID")
}
return id, nil
}
return idInStatus, nil
}
// GetResourceID gets the resource's resource ID. The assumption is
// that the resource supports the `spec.resourceID` field.
// There are two cases:
// (1) If `spec.resourceID` is specified, return its value.
// (2) Otherwise, (happens during KCC upgrade or resource creation), fall back to:
// - Value of `metadata.name` if the resource ID is user-specified.
// - Value of the server generated ID field in status if the resource ID is
// server-generated.
func (r *Resource) GetResourceID() (string, error) {
resourceID, exists, err := unstructured.NestedString(r.Spec, k8s.ResourceIDFieldName)
if err != nil {
return "", fmt.Errorf("error getting the value of "+
"\"spec.%s\": %w", k8s.ResourceIDFieldName, err)
}
if !exists {
if !IsResourceIDFieldServerGenerated(&r.ResourceConfig) {
resourceID = r.GetName()
} else {
resourceID, err = r.GetServerGeneratedID()
if err != nil {
return "", err
}
}
}
if resourceID == "" {
return "", fmt.Errorf("invalid empty value for resource ID")
}
return resourceID, nil
}
func (r *Resource) Unreadable() bool {
return r.ResourceConfig.Unreadable != nil && *r.ResourceConfig.Unreadable
}
// AllTopLevelFieldsAreImmutableOrComputed returns true if the resource schema only
// contains top level fields that are immutable and/or computed.
func (r *Resource) AllTopLevelFieldsAreImmutableOrComputed() bool {
for _, schema := range r.TFResource.Schema {
if !schema.Computed && !schema.ForceNew {
return false
}
}
return true
}
func getObservedStateFromStatus(status map[string]interface{}) map[string]interface{} {
observedState, _, _ := unstructured.NestedMap(status, k8s.ObservedStateFieldName)
return observedState
}
func (r *Resource) GetStatusOrObservedState() map[string]interface{} {
if k8s.OutputOnlyFieldsAreUnderObservedState(r.GroupVersionKind()) {
return getObservedStateFromStatus(r.Status)
}
return r.Status
}
func SupportsResourceIDField(rc *corekccv1alpha1.ResourceConfig) bool {
return rc.ResourceID.TargetField != ""
}
func IsResourceIDFieldServerGenerated(rc *corekccv1alpha1.ResourceConfig) bool {
return rc.ResourceID.TargetField == rc.ServerGeneratedIDField
}
func SupportsServerGeneratedIDField(rc *corekccv1alpha1.ResourceConfig) bool {
return rc.ServerGeneratedIDField != ""
}
func SupportsHierarchicalReferences(rc *corekccv1alpha1.ResourceConfig) bool {
return len(rc.HierarchicalReferences) > 0
}
func SupportsIAM(rc *corekccv1alpha1.ResourceConfig) bool {
emptyIAMConfig := corekccv1alpha1.IAMConfig{}
return !reflect.DeepEqual(rc.IAMConfig, emptyIAMConfig)
}
func GVKForResource(sm *corekccv1alpha1.ServiceMapping, rc *corekccv1alpha1.ResourceConfig) schema.GroupVersionKind {
return schema.GroupVersionKind{
Group: sm.Name,
Version: sm.GetVersionFor(rc),
Kind: rc.Kind,
}
}
func ServerGeneratedIDToTemplate(rc *corekccv1alpha1.ResourceConfig) string {
return fmt.Sprintf("{{%v}}", rc.ServerGeneratedIDField)
}
func isMetadataMappingLabelsField(field string, rc *corekccv1alpha1.ResourceConfig) bool {
return rc.MetadataMapping.Labels != "" && field == rc.MetadataMapping.Labels
}
func isMetadataMappingNameField(field string, rc *corekccv1alpha1.ResourceConfig) bool {
return rc.MetadataMapping.Name != "" && field == rc.MetadataMapping.Name
}
func isServerGeneratedIDField(field string, rc *corekccv1alpha1.ResourceConfig) bool {
return rc.ServerGeneratedIDField != "" && field == rc.ServerGeneratedIDField
}