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plugin.go
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plugin.go
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package plugin
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"text/template"
_ "unsafe" // required for using go:linkname in the file
"github.com/pkg/errors"
sfs "github.com/rakyll/statik/fs"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/cli-runtime/pkg/genericclioptions"
"k8s.io/cli-runtime/pkg/resource"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
"k8s.io/kubectl/pkg/cmd/get"
kyaml "sigs.k8s.io/yaml"
_ "github.com/bergerx/kubectl-status/pkg/plugin/statik" // generated by statik
)
//go:linkname signame runtime.signame
func signame(sig uint32) string
func NewResourceStatusQuery(
clientGetter *genericclioptions.ConfigFlags,
namespace string,
allNamespaces bool,
enforceNamespace bool,
filenames []string,
selector string,
fieldSelector string,
args []string,
) *ResourceStatusQuery {
return &ResourceStatusQuery{
clientGetter,
namespace,
allNamespaces,
enforceNamespace,
filenames,
selector,
fieldSelector,
args,
}
}
type ResourceStatusQuery struct {
clientGetter *genericclioptions.ConfigFlags
namespace string
allNamespaces bool
enforceNamespace bool
filenames []string
selector string
fieldSelector string
args []string
}
func (q ResourceStatusQuery) resolveResourceInfos(resourceResult *resource.Result) ([]*resource.Info, error) {
err := resourceResult.Err()
if err != nil {
return nil, errors.WithMessage(err, "Failed during querying of resources")
}
resourceInfos, err := resourceResult.Infos()
if err != nil {
return nil, errors.WithMessage(err, "Failed getting resource infos")
}
return resourceInfos, nil
}
func (q ResourceStatusQuery) getQueriedResources() ([]*resource.Info, error) {
resourceInfos, err := q.resolveResourceInfos(resource.
NewBuilder(q.clientGetter).
Unstructured().
NamespaceParam(q.namespace).DefaultNamespace().AllNamespaces(q.allNamespaces).
FilenameParam(q.enforceNamespace, &resource.FilenameOptions{Filenames: q.filenames}).
LabelSelectorParam(q.selector).
FieldSelectorParam(q.fieldSelector).
ResourceTypeOrNameArgs(true, q.args...).
ContinueOnError().
Latest().
Flatten().
Do())
if err != nil {
return nil, errors.WithMessage(err, "Failed getting resource infos")
}
if len(resourceInfos) == 0 {
if !q.allNamespaces && q.namespace != "" {
fmt.Printf("No resources found in %s namespace\n", q.namespace)
} else {
fmt.Printf("No resources found.\n")
}
}
return resourceInfos, nil
}
func (q ResourceStatusQuery) PrintRenderedResourceInfos(resourceInfos []*resource.Info) []error {
var allRenderErrs []error
for _, resourceInfo := range resourceInfos {
err := q.PrintRenderedResource(resourceInfo)
if err != nil {
allRenderErrs = append(allRenderErrs, err)
}
}
return allRenderErrs
}
func (q ResourceStatusQuery) PrintRenderedQueriedResources() []error {
resourceInfos, err := q.getQueriedResources()
if err != nil {
return []error{err}
}
return q.PrintRenderedResourceInfos(resourceInfos)
}
func (q ResourceStatusQuery) RenderOtherResources(namespace, kind, name string) []error {
resourceInfos, err := q.resolveResourceInfos(resource.
NewBuilder(q.clientGetter).
Unstructured().
NamespaceParam(namespace).
ResourceTypeOrNameArgs(true, kind, name).
ContinueOnError().
Latest().
Flatten().
Do())
if err != nil {
return []error{err}
}
return q.PrintRenderedResourceInfos(resourceInfos)
}
func (q ResourceStatusQuery) GetKubeGetFunc() func(string, ...string) []interface{} {
return func(namespace string, args ...string) []interface{} {
resourceInfos, _ := q.resolveResourceInfos(q.getResourceQueryResults(namespace, args))
var out []interface{}
for _, resourceInfo := range resourceInfos {
obj := resourceInfo.Object
unstructuredObj, _ := getUnstructuredObj(obj)
out = append(out, unstructuredObj)
}
return out
}
}
func (q ResourceStatusQuery) GetKubeGetFirstFunc() func(string, ...string) interface{} {
return func(namespace string, args ...string) interface{} {
resourceInfos, _ := q.resolveResourceInfos(q.getResourceQueryResults(namespace, args))
if len(resourceInfos) < 1 {
return ""
}
unstructuredObj, _ := getUnstructuredObj(resourceInfos[0].Object)
return unstructuredObj
}
}
func (q ResourceStatusQuery) GetIncludeObjFunc() func(string, ...string) string {
return func(namespace string, args ...string) string {
if namespace == "" && len(args) == 0 {
return ""
}
resourceInfos, err := q.resolveResourceInfos(q.getResourceQueryResults(namespace, args))
if err != nil {
return ""
}
var runtimeObjList []runtime.Object
for _, resourceInfo := range resourceInfos {
runtimeObjList = append(runtimeObjList, resourceInfo.Object)
}
get.NewRuntimeSorter(runtimeObjList, ".metadata.creationTimestamp").Sort()
output := ""
for _, resourceInfo := range runtimeObjList {
renderOutput, _ := q.RenderResource(resourceInfo)
output = fmt.Sprintf("%s\n%s", output, renderOutput)
}
return output
}
}
func (q ResourceStatusQuery) GetIncludeOwnersFunc() func(map[string]interface{}) string {
return func(obj map[string]interface{}) string {
//objR := obj.(runtime.Object)
unstructuredObj := unstructured.Unstructured{Object: obj}
owners := unstructuredObj.GetOwnerReferences()
owner := owners[0] // TODO: We should pick the one with controller, but using first item addresses most cases if not all.
includeObjFunc := q.GetIncludeObjFunc()
return includeObjFunc(unstructuredObj.GetNamespace(), owner.Kind, owner.Name)
}
}
func (q ResourceStatusQuery) getGetEventsFunc() func(map[string]interface{}) map[string]interface{} {
return func(obj map[string]interface{}) map[string]interface{} {
unstructuredObj := unstructured.Unstructured{Object: obj}
restConfig, _ := q.clientGetter.ToRESTConfig()
clientSet, _ := kubernetes.NewForConfig(restConfig)
runtimeObj := unstructuredObj.DeepCopyObject()
events, _ := clientSet.CoreV1().Events(unstructuredObj.GetNamespace()).Search(scheme.Scheme, runtimeObj)
unstructuredEvents, _ := runtime.DefaultUnstructuredConverter.ToUnstructured(&events)
return unstructuredEvents
}
}
func (q ResourceStatusQuery) getResourceQueryResults(namespace string, args []string) *resource.Result {
return resource.
NewBuilder(q.clientGetter).
Unstructured().
NamespaceParam(namespace).
ResourceTypeOrNameArgs(true, args...).
ContinueOnError().
Flatten().
Do()
}
func (q ResourceStatusQuery) PrintRenderedResource(resourceInfo *resource.Info) error {
renderOutput, err := q.RenderResource(resourceInfo.Object)
// Add a newline at the beginning of every template for readability
// Add a newline at the end of every template, as they don't end with a newline
fmt.Printf("\n%s\n", renderOutput)
return err
}
func (q ResourceStatusQuery) RenderResource(obj runtime.Object) (string, error) {
out, err := getUnstructuredObj(obj)
if err != nil {
return "", errors.WithMessage(err, "Failed getting unstructured object")
}
restConfig, err := q.clientGetter.ToRESTConfig()
if err != nil {
return "", errors.WithMessage(err, "Failed getting rest config")
}
kindInjectFuncMap := map[string][]func(obj runtime.Object, restConfig *rest.Config, out map[string]interface{}) error{
"Node": {includePodDetailsOnNode, includeNodeStatsSummary},
"Pod": {includePodMetrics}, // kubectl get --raw /api/v1/nodes/minikube/proxy/stats/summary --> .pods[] | select podRef | containers[] | select name
"StatefulSet": {includeStatefulSetDiff},
"Ingress": {includeIngressServices},
}
kind := obj.GetObjectKind().GroupVersionKind().Kind
functions := kindInjectFuncMap[kind]
for _, f := range functions {
err = f(obj, restConfig, out)
if err != nil {
return "", err
}
}
var output bytes.Buffer
err = renderTemplateForMap(&output, out, &q)
renderOutput := output.String()
return renderOutput, err
}
func RenderFile(manifestFilename string) (string, error) {
var out map[string]interface{}
manifestFile, _ := ioutil.ReadFile(manifestFilename)
err := kyaml.Unmarshal(manifestFile, &out)
if err != nil {
return "", errors.WithMessage(err, "Failed getting JSON for object")
}
var output bytes.Buffer
err = renderTemplateForMap(&output, out)
if err != nil {
return "", err
}
return output.String(), nil
}
func renderTemplateForMap(wr io.Writer, v map[string]interface{}, queries ...*ResourceStatusQuery) error {
if len(queries) > 0 {
// If a ResourceStatusQuery is passed than we can allow running queries in
funcMap["kubeGet"] = queries[0].GetKubeGetFunc()
funcMap["kubeGetFirst"] = queries[0].GetKubeGetFirstFunc()
funcMap["includeObj"] = queries[0].GetIncludeObjFunc()
funcMap["includeOwners"] = queries[0].GetIncludeOwnersFunc()
funcMap["getEvents"] = queries[0].getGetEventsFunc()
}
tmpl, err := getParsedTemplates()
if err != nil {
return err
}
objKind := v["kind"].(string)
kindTemplateName := findTemplateName(tmpl, objKind)
return tmpl.ExecuteTemplate(wr, kindTemplateName, v)
}
func findTemplateName(tmpl *template.Template, kind string) string {
// Returns the kind name if such template exists in templates, else returnDefaultResource
var kindTemplateName string
if t := tmpl.Lookup(kind); t != nil {
kindTemplateName = kind
} else {
kindTemplateName = "DefaultResource"
}
return kindTemplateName
}
func getParsedTemplates() (*template.Template, error) {
templateText, err := getTemplate()
if err != nil {
return nil, err
}
funcMap := getFuncMap()
tmpl, err := template.
New("templates.tmpl").
Funcs(funcMap).
Parse(templateText)
if err != nil {
return nil, err
}
funcMap["include"] = include
tmpl.Funcs(funcMap)
return tmpl, nil
}
func getTemplate() (string, error) {
statikFS, err := sfs.New()
if err != nil {
return "", errors.WithMessage(err, "Failed initiating statikFS")
}
// Access individual files by their paths.
templatesFile := "/templates.tmpl"
t, err := statikFS.Open(templatesFile)
if err != nil {
return "", errors.WithMessage(err, "Failed opening template from statikFS")
}
defer t.Close()
contents, err := ioutil.ReadAll(t)
if err != nil {
return "", errors.WithMessage(err, "Failed reading template from statikFS")
}
return string(contents), nil
}
func getUnstructuredObj(obj interface{}) (map[string]interface{}, error) {
return runtime.DefaultUnstructuredConverter.ToUnstructured(obj)
}