/
dns_record_set.go
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/
dns_record_set.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 resourceoverrides
import (
"fmt"
"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/k8s"
"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/util/crdutil"
"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
apiextensions "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
)
var (
rrdatasFieldName = "rrdatas"
rrdatasRefsFieldName = "rrdatasRefs"
routingPolicyFieldName = "routingPolicy"
)
func GetDNSRecordSetOverrides() ResourceOverrides {
ro := ResourceOverrides{
Kind: "DNSRecordSet",
}
// Preserve the legacy non-reference field 'rrdatas' after it is changed to
// a reference field, 'rrdatasRefs'.
ro.Overrides = append(ro.Overrides, preserveRrdatasFieldAndEnsureRrdatasRefsFieldIsMultiKind())
// Configure the top-level OneOf to make 'routingPolicy', 'rrdatas' and
// 'rrdatasRef' mutually exclusive.
ro.Overrides = append(ro.Overrides, enforceMutuallyExclusiveRrdatasAndRoutingPolicy())
// Configure rrdatasRefs fields under routingPolicy to be MultiKind.
ro.Overrides = append(ro.Overrides, ensureRoutingPoliciesRrDatasRefsFieldsAreMultiKind())
return ro
}
func preserveRrdatasFieldAndEnsureRrdatasRefsFieldIsMultiKind() ResourceOverride {
o := ResourceOverride{}
o.CRDDecorate = func(crd *apiextensions.CustomResourceDefinition) error {
if err := PreserveMutuallyExclusiveNonReferenceField(crd, nil, rrdatasRefsFieldName, rrdatasFieldName); err != nil {
return fmt.Errorf("error preserving '%v' field in DNSRecordSet: %w", rrdatasFieldName, err)
}
if err := EnsureReferenceFieldIsMultiKind(crd, nil, rrdatasRefsFieldName, []string{"ComputeAddress"}); err != nil {
return fmt.Errorf("error ensuring '%v' field in DNSRecordSet is a multi-kind reference field: %w", rrdatasRefsFieldName, err)
}
// PreserveMutuallyExclusiveNonReferenceField adds a `not` condition to
// prevent rrdatas and rrdatasRefs from being set together. This is
// redundant due to the enforceMutuallyExclusiveRrdatasAndRoutingPolicy
// override, so we will manually remove it.
schema := k8s.GetOpenAPIV3SchemaFromCRD(crd)
spec := schema.Properties["spec"]
if err := crdutil.SetNotRuleForObjectOrArray(&spec, nil); err != nil {
return err
}
return crdutil.SetSchemaForFieldUnderObjectOrArray("spec", schema, &spec)
}
o.PreActuationTransform = func(r *k8s.Resource) error {
if err := FavorReferenceArrayFieldOverNonReferenceArrayField(r, []string{rrdatasFieldName}, []string{rrdatasRefsFieldName}); err != nil {
return fmt.Errorf("error handling '%v' and '%v' fields in pre-actuation transformation: %w", rrdatasFieldName, rrdatasRefsFieldName, err)
}
return nil
}
o.PostActuationTransform = func(original, reconciled *k8s.Resource, tfState *terraform.InstanceState, dclState *unstructured.Unstructured) error {
if err := PreserveUserSpecifiedLegacyArrayField(original, reconciled, []string{rrdatasFieldName}...); err != nil {
return fmt.Errorf("error preserving user-specified '%v' in post-actuation transformation: %w", rrdatasFieldName, err)
}
if err := PruneDefaultedAuthoritativeArrayFieldIfOnlyLegacyArrayFieldSpecified(original, reconciled, []string{rrdatasFieldName}, []string{rrdatasRefsFieldName}); err != nil {
return fmt.Errorf("error conditionally pruning defaulted '%v' in post-actuation transformation: %w", rrdatasRefsFieldName, err)
}
return nil
}
return o
}
func enforceMutuallyExclusiveRrdatasAndRoutingPolicy() ResourceOverride {
o := ResourceOverride{}
o.CRDDecorate = func(crd *apiextensions.CustomResourceDefinition) error {
schema := k8s.GetOpenAPIV3SchemaFromCRD(crd)
spec := schema.Properties["spec"]
requireField := func(field string) *apiextensions.JSONSchemaProps {
return &apiextensions.JSONSchemaProps{
Required: []string{field},
}
}
if err := crdutil.SetOneOfRuleForObjectOrArray(&spec, []*apiextensions.JSONSchemaProps{
requireField(rrdatasFieldName),
requireField(rrdatasRefsFieldName),
requireField(routingPolicyFieldName),
}); err != nil {
return err
}
return crdutil.SetSchemaForFieldUnderObjectOrArray("spec", schema, &spec)
}
return o
}
func ensureRoutingPoliciesRrDatasRefsFieldsAreMultiKind() ResourceOverride {
o := ResourceOverride{}
o.CRDDecorate = func(crd *apiextensions.CustomResourceDefinition) error {
if err := EnsureReferenceFieldIsMultiKind(crd, []string{routingPolicyFieldName, "wrr"}, rrdatasRefsFieldName, []string{"ComputeAddress"}); err != nil {
return fmt.Errorf("error ensuring '%v' field in DNSRecordSet is a multi-kind reference field: %w", rrdatasRefsFieldName, err)
}
if err := EnsureReferenceFieldIsMultiKind(crd, []string{routingPolicyFieldName, "geo"}, rrdatasRefsFieldName, []string{"ComputeAddress"}); err != nil {
return fmt.Errorf("error ensuring '%v' field in DNSRecordSet is a multi-kind reference field: %w", rrdatasRefsFieldName, err)
}
return nil
}
return o
}