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helm/pkg/engine/lookup_func.go

125 lines
4.3 KiB

/*
Copyright The Helm Authors.
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 engine
import (
"context"
"log"
"strings"
"github.com/pkg/errors"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/discovery"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/rest"
)
type lookupFunc = func(apiversion string, resource string, namespace string, name string) (map[string]interface{}, error)
// NewLookupFunction returns a function for looking up objects in the cluster.
//
// If the resource does not exist, no error is raised.
//
// This function is considered deprecated, and will be renamed in Helm 4. It will no
// longer be a public function.
func NewLookupFunction(config *rest.Config) lookupFunc {
return func(apiversion string, resource string, namespace string, name string) (map[string]interface{}, error) {
var client dynamic.ResourceInterface
c, namespaced, err := getDynamicClientOnKind(apiversion, resource, config)
if err != nil {
return map[string]interface{}{}, err
}
if namespaced && namespace != "" {
client = c.Namespace(namespace)
} else {
client = c
}
if name != "" {
// this will return a single object
obj, err := client.Get(context.Background(), name, metav1.GetOptions{})
if err != nil {
if apierrors.IsNotFound(err) {
// Just return an empty interface when the object was not found.
// That way, users can use `if not (lookup ...)` in their templates.
return map[string]interface{}{}, nil
}
return map[string]interface{}{}, err
}
return obj.UnstructuredContent(), nil
}
// this will return a list
obj, err := client.List(context.Background(), metav1.ListOptions{})
if err != nil {
if apierrors.IsNotFound(err) {
// Just return an empty interface when the object was not found.
// That way, users can use `if not (lookup ...)` in their templates.
return map[string]interface{}{}, nil
}
return map[string]interface{}{}, err
}
return obj.UnstructuredContent(), nil
}
}
// getDynamicClientOnUnstructured returns a dynamic client on an Unstructured type. This client can be further namespaced.
func getDynamicClientOnKind(apiversion string, kind string, config *rest.Config) (dynamic.NamespaceableResourceInterface, bool, error) {
gvk := schema.FromAPIVersionAndKind(apiversion, kind)
chore: Spelling (#9410) * spelling: annotate Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: asserts Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: behavior Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: binary Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: contain Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: copied Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: dependency Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: depending Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: deprecated Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: doesn't Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: donot Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: github Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: inputting Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: iteration Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: jabberwocky Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: kubernetes Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: length Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: mismatch Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: multiple Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: nonexistent Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: outputs Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: panicking Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: plugins Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: parsing Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: porthos Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: regular Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: resource Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: repositories Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: something Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: strict Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: string Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: unknown Signed-off-by: Josh Soref <jsoref@users.noreply.github.com>
4 years ago
apiRes, err := getAPIResourceForGVK(gvk, config)
if err != nil {
log.Printf("[ERROR] unable to get apiresource from unstructured: %s , error %s", gvk.String(), err)
return nil, false, errors.Wrapf(err, "unable to get apiresource from unstructured: %s", gvk.String())
}
gvr := schema.GroupVersionResource{
Group: apiRes.Group,
Version: apiRes.Version,
Resource: apiRes.Name,
}
intf, err := dynamic.NewForConfig(config)
if err != nil {
log.Printf("[ERROR] unable to get dynamic client %s", err)
return nil, false, err
}
res := intf.Resource(gvr)
return res, apiRes.Namespaced, nil
}
chore: Spelling (#9410) * spelling: annotate Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: asserts Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: behavior Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: binary Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: contain Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: copied Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: dependency Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: depending Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: deprecated Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: doesn't Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: donot Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: github Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: inputting Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: iteration Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: jabberwocky Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: kubernetes Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: length Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: mismatch Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: multiple Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: nonexistent Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: outputs Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: panicking Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: plugins Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: parsing Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: porthos Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: regular Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: resource Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: repositories Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: something Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: strict Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: string Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> * spelling: unknown Signed-off-by: Josh Soref <jsoref@users.noreply.github.com>
4 years ago
func getAPIResourceForGVK(gvk schema.GroupVersionKind, config *rest.Config) (metav1.APIResource, error) {
res := metav1.APIResource{}
discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
log.Printf("[ERROR] unable to create discovery client %s", err)
return res, err
}
resList, err := discoveryClient.ServerResourcesForGroupVersion(gvk.GroupVersion().String())
if err != nil {
log.Printf("[ERROR] unable to retrieve resource list for: %s , error: %s", gvk.GroupVersion().String(), err)
return res, err
}
for _, resource := range resList.APIResources {
// if a resource contains a "/" it's referencing a subresource. we don't support suberesource for now.
if resource.Kind == gvk.Kind && !strings.Contains(resource.Name, "/") {
res = resource
res.Group = gvk.Group
res.Version = gvk.Version
break
}
}
return res, nil
}