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value_resolver.go
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/
value_resolver.go
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package tenant
import (
"encoding/json"
"fmt"
"github.com/PaesslerAG/jsonpath"
corev1alpha1 "github.com/kristofferahl/aeto/apis/core/v1alpha1"
"github.com/kristofferahl/aeto/internal/pkg/kubernetes"
"github.com/kristofferahl/aeto/internal/pkg/reconcile"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
)
type ValueResolver struct {
TenantName string
TenantNamespace string
OperatorNamespace string
ResourceGroups []ResourceGroup
Client kubernetes.Client
Context reconcile.Context
}
func (r ValueResolver) Func(vr corev1alpha1.ValueRef) (string, error) {
resolvers := make([]func(r ValueResolver, vr corev1alpha1.ValueRef) (string, error), 0)
if vr.Blueprint != nil {
resolvers = append(resolvers, resolveFromBlueprint)
}
if vr.Resource != nil {
resolvers = append(resolvers, resolveFromResource)
}
if len(resolvers) == 0 {
return "", fmt.Errorf("invalid value reference, blueprint or resource is required")
}
if len(resolvers) > 1 {
return "", fmt.Errorf("invalid value reference, multiple references not allowed")
}
resolve := resolvers[0]
return resolve(r, vr)
}
// Group returns a resource group matching the specified name
func (r *ValueResolver) Group(name string) (*ResourceGroup, error) {
for _, group := range r.ResourceGroups {
if group.Name == name {
return &group, nil
}
}
return nil, fmt.Errorf("resource group %s not found", name)
}
func resolveFromBlueprint(r ValueResolver, vr corev1alpha1.ValueRef) (string, error) {
ref := vr.Blueprint
group, err := r.Group(ref.ResourceGroup)
if err != nil {
return "", fmt.Errorf("invalid value refrence, resource \"%s\" not found in resource set", ref.ResourceGroup)
}
value, err := group.JsonPath(ref.JsonPath)
if err != nil {
return "", fmt.Errorf("invalid value refrence for \"%s\" %s, jsonpath error: %v", ref.ResourceGroup, ref.JsonPath, err)
}
return value, nil
}
func resolveFromResource(r ValueResolver, vr corev1alpha1.ValueRef) (string, error) {
ref := vr.Resource
resourceRef := types.NamespacedName{
Namespace: ref.Namespace,
Name: ref.Name,
}
resourceGvk := schema.FromAPIVersionAndKind(ref.ApiVersion, ref.Kind)
if resourceRef.Name == "$TENANT_NAME" {
resourceRef.Name = r.TenantName
}
if resourceRef.Namespace == "$TENANT_NAMESPACE" {
resourceRef.Namespace = r.TenantNamespace
}
if resourceRef.Namespace == "$OPERATOR_NAMESPACE" {
resourceRef.Namespace = r.OperatorNamespace
}
resource, err := r.Client.DynamicGet(r.Context, resourceRef, resourceGvk)
if err != nil {
return "", fmt.Errorf("invalid value refrence, error fetching resource \"%s\" %s: %v", resourceRef.String(), resourceGvk.String(), err)
}
if resource == nil {
return "", fmt.Errorf("invalid value refrence, resource \"%s\" %s not found", resourceRef.String(), resourceGvk.String())
}
bytes, _ := resource.MarshalJSON()
v := interface{}(nil)
json.Unmarshal(bytes, &v)
value, err := jsonpath.Get(fmt.Sprintf("$%s", ref.JsonPath), v)
if err != nil {
return "", fmt.Errorf("invalid value refrence for \"%s\" %s, jsonpath error: %v", resourceRef.String(), resourceGvk.String(), err)
}
return fmt.Sprintf("%s", value), nil
}