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client.go
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client.go
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// Copyright (c) 2019 VMware, Inc. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package k8s
import (
"strings"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/cli-runtime/pkg/printers"
"k8s.io/client-go/discovery"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
const (
LegacyGroupName = "core"
)
// Client prepares and exposes a dynamic, discovery, and Rest clients
type Client struct {
Client dynamic.Interface
Disco discovery.DiscoveryInterface
CoreRest rest.Interface
JsonPrinter printers.JSONPrinter
}
// New returns a *Client
func New(kubeconfig string) (*Client, error) {
// creating cfg for each client type because each
// setup its own cfg default which may not be compatible
dynCfg, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, err
}
client, err := dynamic.NewForConfig(dynCfg)
if err != nil {
return nil, err
}
discoCfg, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, err
}
disco, err := discovery.NewDiscoveryClientForConfig(discoCfg)
if err != nil {
return nil, err
}
restCfg, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, err
}
setCoreDefaultConfig(restCfg)
restc, err := rest.RESTClientFor(restCfg)
if err != nil {
return nil, err
}
return &Client{Client: client, Disco: disco, CoreRest: restc}, nil
}
func (k8sc *Client) Search(params SearchParams) ([]SearchResult, error) {
return k8sc._search(strings.Join(params.Groups, " "),
strings.Join(params.Kinds, " "),
strings.Join(params.Namespaces, " "),
strings.Join(params.Versions, " "),
strings.Join(params.Names, " "),
strings.Join(params.Labels, " "),
strings.Join(params.Containers, " "))
}
// Search does a drill-down search from group, version, resourceList, to resources. The following rules are applied
// 1) Legacy core group (api/v1) can be specified as "core"
// 2) All specified search params will use AND operator for match (i.e. groups=core AND kinds=pods AND versions=v1 AND ... etc)
// 3) kinds will match resource.Kind or resource.Name
// 4) All search params are passed as comma- or space-separated sets that are matched using OR (i.e. kinds=pods services
// will match resouces of type pods or services)
func (k8sc *Client) _search(groups, kinds, namespaces, versions, names, labels, containers string) ([]SearchResult, error) {
// normalize params
groups = strings.ToLower(groups)
kinds = strings.ToLower(kinds)
namespaces = strings.ToLower(namespaces)
versions = strings.ToLower(versions)
labels = strings.ToLower(labels)
containers = strings.ToLower(containers)
logrus.Debugf(
"Search filters groups:[%v]; kinds:[%v]; namespaces:[%v]; versions:[%v]; names:[%v]; labels:[%v] containers:[%s]",
groups, kinds, namespaces, versions, names, labels, containers,
)
grpList, err := k8sc.Disco.ServerGroups()
if err != nil {
return nil, err
}
// if namespace filters not provided, assume all namespaces
if len(namespaces) == 0 {
nsNames, err := getNamespaces(k8sc)
if err != nil {
return nil, err
}
namespaces = strings.Join(nsNames, " ")
}
var finalResults []SearchResult
logrus.Debugf("Searching in %d groups", len(grpList.Groups))
for _, grp := range grpList.Groups {
// filter by group
grpName := strings.TrimSpace(grp.Name)
grpName = getLegacyGrpName(grpName)
if len(groups) > 0 && !strings.Contains(groups, strings.ToLower(grpName)) {
continue
}
// filter by group version
logrus.Debugf("Searching resources in Group %s", grpName)
for _, discoGV := range grp.Versions {
if len(versions) > 0 && !strings.Contains(versions, strings.ToLower(discoGV.Version)) {
continue
}
// adjust version for legacy group
grpVersion := discoGV.GroupVersion
if grpName == LegacyGroupName {
grpVersion = discoGV.Version
}
logrus.Debugf("Searching resources in GroupVersion %s", discoGV.GroupVersion)
resources, err := k8sc.Disco.ServerResourcesForGroupVersion(grpVersion)
if err != nil {
logrus.Errorf("K8s.Search failed to get resources for %s: %s", discoGV.GroupVersion, err)
continue
}
// filter by resource kind
for _, res := range resources.APIResources {
if len(kinds) > 0 && !strings.Contains(kinds, strings.ToLower(res.Kind)) {
continue
}
gvr := schema.GroupVersionResource{
Group: toLegacyGrpName(grpName),
Version: discoGV.Version,
Resource: res.Name,
}
logrus.Debugf(`Searching for GroupResource %#v`, gvr)
// retrieve API objects based on GroupVersionResource and
// filter by namespaces and names
listOptions := metav1.ListOptions{
LabelSelector: labels,
}
// gather found resources
var results []SearchResult
if res.Namespaced {
for _, ns := range splitParamList(namespaces) {
logrus.Debugf("Searching for %s in namespace %s [GroupRes: %v]", res.Name, ns, gvr)
list, err := k8sc.Client.Resource(gvr).Namespace(ns).List(listOptions)
if err != nil {
logrus.Debugf(
"WARN: K8s.Search failed to get %s in %s [GroupRes: %s][labels: %v]: %s",
res.Name, ns, discoGV.GroupVersion, listOptions.LabelSelector, err,
)
continue
}
logrus.Debugf("Found %d %s in namespace [%s]", len(list.Items), res.Name, ns)
result := SearchResult{
ListKind: list.GetKind(),
ResourceName: res.Name,
ResourceKind: res.Kind,
Namespaced: res.Namespaced,
Namespace: ns,
GroupVersionResource: gvr,
List: list,
}
results = append(results, result)
}
} else {
logrus.Debugf("Searching for resource %s (non-namespaced)", res.Name)
list, err := k8sc.Client.Resource(gvr).List(listOptions)
if err != nil {
logrus.Debugf(
"WARN: K8s.Search failed to get %s: [GroupRes: %s] [labels: %v]: %s",
res.Name, discoGV.GroupVersion, listOptions.LabelSelector, err,
)
continue
}
logrus.Debugf("Found %d %s (non-namespaced)", len(list.Items), res.Name)
result := SearchResult{
ListKind: list.GetKind(),
ResourceKind: res.Kind,
ResourceName: res.Name,
Namespaced: res.Namespaced,
GroupVersionResource: gvr,
List: list,
}
results = append(results, result)
}
// apply name filters
for _, result := range results {
filteredResult := result
if len(containers) > 0 && result.ListKind == "PodList" {
filteredResult = filterPodsByContainers(result, containers)
logrus.Debugf("Found %d %s with container filter [%s]", len(filteredResult.List.Items), filteredResult.ResourceName, containers)
}
if len(names) > 0 {
filteredResult = filterByNames(result, names)
logrus.Debugf("Found %d %s with name filter [%s]", len(filteredResult.List.Items), filteredResult.ResourceName, names)
}
finalResults = append(finalResults, filteredResult)
}
}
}
}
return finalResults, nil
}
func setCoreDefaultConfig(config *rest.Config) {
config.GroupVersion = &corev1.SchemeGroupVersion
config.APIPath = "/api"
config.NegotiatedSerializer = scheme.Codecs.WithoutConversion()
if config.UserAgent == "" {
config.UserAgent = rest.DefaultKubernetesUserAgent()
}
}
func toLegacyGrpName(str string) string {
if str == "core" {
return ""
}
return str
}
func getLegacyGrpName(str string) string {
if str == "" {
return "core"
}
return str
}
func splitParamList(nses string) []string {
if len(nses) == 0 {
return []string{}
}
if strings.Contains(nses, ",") {
return strings.Split(nses, ",")
}
return strings.Split(nses, " ")
}
func strSliceContains(values []string, val string) bool {
if len(values) == 0 {
return false
}
for _, v := range values {
if strings.EqualFold(strings.TrimSpace(v), strings.TrimSpace(val)) {
return true
}
}
return false
}
func filterByNames(result SearchResult, names string) SearchResult {
if len(names) == 0 {
return result
}
var filteredItems []unstructured.Unstructured
for _, item := range result.List.Items {
if len(names) > 0 && !strings.Contains(names, item.GetName()) {
continue
}
filteredItems = append(filteredItems, item)
}
result.List.Items = filteredItems
return result
}
func filterPodsByContainers(result SearchResult, containers string) SearchResult {
if result.ListKind != "PodList" {
return result
}
var filteredItems []unstructured.Unstructured
for _, podItem := range result.List.Items {
containerItems := getPodContainers(podItem)
for _, containerItem := range containerItems {
containerObj, ok := containerItem.(map[string]interface{})
if !ok {
logrus.Errorf("Failed to assert ustructured item (type %T) as Container", containerItem)
continue
}
name, ok, err := unstructured.NestedString(containerObj, "name")
if !ok || err != nil {
logrus.Errorf("Failed to get container object name: %s", err)
continue
}
if len(containers) > 0 && !strings.Contains(containers, name) {
logrus.Debugf("Container %s not found in filter list %s", name, containers)
continue
}
filteredItems = append(filteredItems, podItem)
}
}
result.List.Items = filteredItems
return result
}
// getPodContainers collect and return init-containers, containers, ephemeral containers from pod item
func getPodContainers(podItem unstructured.Unstructured) []interface{} {
var result []interface{}
initContainers, ok, err := unstructured.NestedSlice(podItem.Object, "spec", "initContainers")
if err != nil {
logrus.Errorf("Failed to get init-containers for pod %s: %s", podItem.GetName(), err)
}
if ok {
result = append(result, initContainers...)
}
containers, ok, err := unstructured.NestedSlice(podItem.Object, "spec", "containers")
if err != nil {
logrus.Errorf("Failed to get containers for pod %s: %s", podItem.GetName(), err)
}
if ok {
result = append(result, containers...)
}
return result
}
// getNamespaces collect all available namespaces in cluster
func getNamespaces(k8sc *Client) ([]string, error) {
gvr := schema.GroupVersionResource{
Group: "",
Version: "v1",
Resource: "namespaces",
}
objList, err := k8sc.Client.Resource(gvr).List(metav1.ListOptions{})
if err != nil {
return nil, err
}
names := make([]string, len(objList.Items))
for i, obj := range objList.Items {
names[i] = obj.GetName()
}
return names, nil
}