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kubernetes.go
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kubernetes.go
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package kubernetes
import (
"bytes"
goerrors "errors"
"fmt"
"time"
osapps_v1 "github.com/openshift/api/apps/v1"
osproject_v1 "github.com/openshift/api/project/v1"
osroutes_v1 "github.com/openshift/api/route/v1"
apps_v1 "k8s.io/api/apps/v1"
v1 "k8s.io/api/authentication/v1"
auth_v1 "k8s.io/api/authorization/v1"
batch_v1 "k8s.io/api/batch/v1"
batch_v1beta1 "k8s.io/api/batch/v1beta1"
core_v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/version"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/tools/clientcmd/api"
"github.com/kiali/kiali/log"
"github.com/kiali/kiali/util/httputil"
)
type K8SClientInterface interface {
ForwardGetRequest(namespace, podName string, localPort, destinationPort int, path string) ([]byte, error)
GetClusterServicesByLabels(labelsSelector string) ([]core_v1.Service, error)
GetConfigMap(namespace, name string) (*core_v1.ConfigMap, error)
GetCronJobs(namespace string) ([]batch_v1beta1.CronJob, error)
GetDaemonSet(namespace string, name string) (*apps_v1.DaemonSet, error)
GetDaemonSets(namespace string) ([]apps_v1.DaemonSet, error)
GetDeployment(namespace string, name string) (*apps_v1.Deployment, error)
GetDeployments(namespace string) ([]apps_v1.Deployment, error)
GetDeploymentConfig(namespace string, name string) (*osapps_v1.DeploymentConfig, error)
GetDeploymentConfigs(namespace string) ([]osapps_v1.DeploymentConfig, error)
GetEndpoints(namespace string, name string) (*core_v1.Endpoints, error)
GetJobs(namespace string) ([]batch_v1.Job, error)
GetNamespace(namespace string) (*core_v1.Namespace, error)
GetNamespaces(labelSelector string) ([]core_v1.Namespace, error)
GetPod(namespace, name string) (*core_v1.Pod, error)
GetPodLogs(namespace, name string, opts *core_v1.PodLogOptions) (*PodLogs, error)
GetPods(namespace, labelSelector string) ([]core_v1.Pod, error)
GetPodPortForwarder(namespace, podName, portMap string) (*httputil.PortForwarder, error)
GetReplicationControllers(namespace string) ([]core_v1.ReplicationController, error)
GetReplicaSets(namespace string) ([]apps_v1.ReplicaSet, error)
GetSecret(namespace, name string) (*core_v1.Secret, error)
GetSecrets(namespace string, labelSelector string) ([]core_v1.Secret, error)
GetSelfSubjectAccessReview(namespace, api, resourceType string, verbs []string) ([]*auth_v1.SelfSubjectAccessReview, error)
GetService(namespace string, name string) (*core_v1.Service, error)
GetServices(namespace string, selectorLabels map[string]string) ([]core_v1.Service, error)
GetServicesByLabels(namespace string, labelsSelector string) ([]core_v1.Service, error)
GetStatefulSet(namespace string, name string) (*apps_v1.StatefulSet, error)
GetStatefulSets(namespace string) ([]apps_v1.StatefulSet, error)
GetTokenSubject(authInfo *api.AuthInfo) (string, error)
UpdateNamespace(namespace string, jsonPatch string) (*core_v1.Namespace, error)
UpdateService(namespace string, name string, jsonPatch string) error
UpdateWorkload(namespace string, name string, workloadType string, jsonPatch string) error
}
type OSClientInterface interface {
GetProject(project string) (*osproject_v1.Project, error)
GetProjects(labelSelector string) ([]osproject_v1.Project, error)
GetRoute(namespace string, name string) (*osroutes_v1.Route, error)
UpdateProject(project string, jsonPatch string) (*osproject_v1.Project, error)
}
func (in *K8SClient) ForwardGetRequest(namespace, podName string, localPort, destinationPort int, path string) ([]byte, error) {
f, err := in.GetPodPortForwarder(namespace, podName, fmt.Sprintf("%d:%d", localPort, destinationPort))
if err != nil {
return nil, err
}
// Start the forwarding
if err := (*f).Start(); err != nil {
return nil, err
}
// Defering the finish of the port-forwarding
defer (*f).Stop()
// Ready to create a request
resp, code, err := httputil.HttpGet(fmt.Sprintf("http://localhost:%d%s", localPort, path), nil, 10*time.Second, nil)
if code >= 400 {
return resp, fmt.Errorf("error fetching %s from %s/%s. Response code: %d", path, namespace, podName, code)
}
return resp, err
}
// GetClusterServicesByLabels fetches and returns all services in the whole cluster
// that match the optional labelSelector. This is using the cluster-wide call
// to fetch the services. The client will need to be created with an account that
// has cluster-wide privileges to list services.
func (in *K8SClient) GetClusterServicesByLabels(labelsSelector string) ([]core_v1.Service, error) {
selector := meta_v1.ListOptions{LabelSelector: labelsSelector}
if allServicesList, err := in.k8s.CoreV1().Services("").List(in.ctx, selector); err == nil {
return allServicesList.Items, nil
} else {
return []core_v1.Service{}, err
}
}
// GetConfigMap fetches and returns the specified ConfigMap definition
// from the cluster
func (in *K8SClient) GetConfigMap(namespace, name string) (*core_v1.ConfigMap, error) {
configMap, err := in.k8s.CoreV1().ConfigMaps(namespace).Get(in.ctx, name, emptyGetOptions)
if err != nil {
return &core_v1.ConfigMap{}, err
}
return configMap, nil
}
// GetNamespace fetches and returns the specified namespace definition
// from the cluster
func (in *K8SClient) GetNamespace(namespace string) (*core_v1.Namespace, error) {
ns, err := in.k8s.CoreV1().Namespaces().Get(in.ctx, namespace, emptyGetOptions)
if err != nil {
return &core_v1.Namespace{}, err
}
return ns, nil
}
// GetServerVersion fetches and returns information about the version Kubernetes that is running
func (in *K8SClient) GetServerVersion() (*version.Info, error) {
return in.k8s.Discovery().ServerVersion()
}
// GetNamespaces returns a list of all namespaces of the cluster.
// It returns a list of all namespaces of the cluster.
// It returns an error on any problem.
func (in *K8SClient) GetNamespaces(labelSelector string) ([]core_v1.Namespace, error) {
var listOptions meta_v1.ListOptions
// Apply labelSelector filtering if specified
if labelSelector != "" {
listOptions = meta_v1.ListOptions{LabelSelector: labelSelector}
} else {
listOptions = emptyListOptions
}
namespaces, err := in.k8s.CoreV1().Namespaces().List(in.ctx, listOptions)
if err != nil {
return nil, err
}
return namespaces.Items, nil
}
// GetProject fetches and returns the definition of the project with
// the specified name by querying the cluster API. GetProject will fail
// if the underlying cluster is not Openshift.
func (in *K8SClient) GetProject(name string) (*osproject_v1.Project, error) {
result := &osproject_v1.Project{}
err := in.k8s.RESTClient().Get().Prefix("apis", "project.openshift.io", "v1", "projects", name).Do(in.ctx).Into(result)
if err != nil {
return nil, err
}
return result, nil
}
func (in *K8SClient) GetProjects(labelSelector string) ([]osproject_v1.Project, error) {
result := &osproject_v1.ProjectList{}
request := in.k8s.RESTClient().Get().Prefix("apis", "project.openshift.io", "v1", "projects")
// Apply label selector filtering if specified
if labelSelector != "" {
request.Param("labelSelector", labelSelector)
}
err := request.Do(in.ctx).Into(result)
if err != nil {
return nil, err
}
return result.Items, nil
}
func (in *K8SClient) IsOpenShift() bool {
if in.isOpenShift == nil {
isOpenShift := false
_, err := in.k8s.RESTClient().Get().AbsPath("/apis/project.openshift.io").Do(in.ctx).Raw()
if err == nil {
isOpenShift = true
}
in.isOpenShift = &isOpenShift
}
return *in.isOpenShift
}
// GetServices returns a list of services for a given namespace.
// If selectorLabels is defined the list of services is filtered for those that matches Services selector labels.
// It returns an error on any problem.
// NOTE: The selectorLabels argument is NOT to find services matching the given labels. Assume selectorLabels are
// the labels of a Deployment. If this imaginary Deployment is selected by the Service (because of its Selector), then
// that service is returned; else it's omitted.
func (in *K8SClient) GetServices(namespace string, selectorLabels map[string]string) ([]core_v1.Service, error) {
var allServices []core_v1.Service
if allServicesList, err := in.k8s.CoreV1().Services(namespace).List(in.ctx, emptyListOptions); err == nil {
allServices = allServicesList.Items
} else {
return []core_v1.Service{}, err
}
if selectorLabels == nil {
return allServices, nil
}
var services []core_v1.Service
for _, svc := range allServices {
svcSelector := labels.Set(svc.Spec.Selector).AsSelector()
if !svcSelector.Empty() && svcSelector.Matches(labels.Set(selectorLabels)) {
services = append(services, svc)
}
}
return services, nil
}
func (in *K8SClient) GetServicesByLabels(namespace string, labelsSelector string) ([]core_v1.Service, error) {
selector := meta_v1.ListOptions{LabelSelector: labelsSelector}
if allServicesList, err := in.k8s.CoreV1().Services(namespace).List(in.ctx, selector); err == nil {
return allServicesList.Items, nil
} else {
return []core_v1.Service{}, err
}
}
func (in *K8SClient) GetDaemonSet(namespace string, name string) (*apps_v1.DaemonSet, error) {
return in.k8s.AppsV1().DaemonSets(namespace).Get(in.ctx, name, emptyGetOptions)
}
func (in *K8SClient) GetDaemonSets(namespace string) ([]apps_v1.DaemonSet, error) {
if daeList, err := in.k8s.AppsV1().DaemonSets(namespace).List(in.ctx, emptyListOptions); err == nil {
return daeList.Items, nil
} else {
return []apps_v1.DaemonSet{}, err
}
}
// GetDeployment returns the definition of a specific deployment.
// It returns an error on any problem.
func (in *K8SClient) GetDeployment(namespace, name string) (*apps_v1.Deployment, error) {
return in.k8s.AppsV1().Deployments(namespace).Get(in.ctx, name, emptyGetOptions)
}
// GetRoute returns the external URL endpoint of a specific route name.
// It returns an error on any problem.
func (in *K8SClient) GetRoute(namespace, name string) (*osroutes_v1.Route, error) {
result := &osroutes_v1.Route{}
err := in.k8s.RESTClient().Get().Prefix("apis", "route.openshift.io", "v1").Namespace(namespace).Resource("routes").SubResource(name).Do(in.ctx).Into(result)
if err != nil {
return nil, err
}
return result, nil
}
// GetDeployments returns an array of deployments for a given namespace.
// It returns an error on any problem.
func (in *K8SClient) GetDeployments(namespace string) ([]apps_v1.Deployment, error) {
if depList, err := in.k8s.AppsV1().Deployments(namespace).List(in.ctx, emptyListOptions); err == nil {
return depList.Items, nil
} else {
return []apps_v1.Deployment{}, err
}
}
// GetDeployment returns the definition of a specific deployment.
// It returns an error on any problem.
func (in *K8SClient) GetDeploymentConfig(namespace, name string) (*osapps_v1.DeploymentConfig, error) {
result := &osapps_v1.DeploymentConfig{}
err := in.k8s.RESTClient().Get().Prefix("apis", "apps.openshift.io", "v1").Namespace(namespace).Resource("deploymentconfigs").SubResource(name).Do(in.ctx).Into(result)
if err != nil {
return nil, err
}
return result, nil
}
// GetDeployments returns an array of deployments for a given namespace.
// An empty labelSelector will fetch all Deployments for a namespace.
// It returns an error on any problem.
func (in *K8SClient) GetDeploymentConfigs(namespace string) ([]osapps_v1.DeploymentConfig, error) {
result := &osapps_v1.DeploymentConfigList{}
err := in.k8s.RESTClient().Get().Prefix("apis", "apps.openshift.io", "v1").Namespace(namespace).Resource("deploymentconfigs").Do(in.ctx).Into(result)
if err != nil {
return nil, err
}
return result.Items, nil
}
// GetReplicaSets returns the ReplicaSets for the namespace. For any given Owner (i.e. Deployment),
// only the most recent ReplicaSet will be included in the returned list. When an owning Deployment
// is configured with revisionHistoryLimit > 0, then k8s may return multiple ReplicaSets for the
// same Deployment (current and older revisions).
// see also: ./cache/kubernetes.go
func (in *K8SClient) GetReplicaSets(namespace string) ([]apps_v1.ReplicaSet, error) {
if rsList, err := in.k8s.AppsV1().ReplicaSets(namespace).List(in.ctx, emptyListOptions); err == nil {
activeRSMap := map[string]apps_v1.ReplicaSet{}
for _, rs := range rsList.Items {
if len(rs.OwnerReferences) > 0 {
for _, ownerRef := range rs.OwnerReferences {
if ownerRef.Controller != nil && *ownerRef.Controller {
if currRS, ok := activeRSMap[ownerRef.Name]; ok {
if currRS.CreationTimestamp.Time.Before(rs.CreationTimestamp.Time) {
activeRSMap[ownerRef.Name] = rs
}
} else {
activeRSMap[ownerRef.Name] = rs
}
}
}
} else {
// it is it's own controller
activeRSMap[rs.Name] = rs
}
}
result := make([]apps_v1.ReplicaSet, len(activeRSMap))
i := 0
for _, activeRS := range activeRSMap {
result[i] = activeRS
i = i + 1
}
return result, nil
} else {
return []apps_v1.ReplicaSet{}, err
}
}
func (in *K8SClient) GetStatefulSet(namespace string, name string) (*apps_v1.StatefulSet, error) {
return in.k8s.AppsV1().StatefulSets(namespace).Get(in.ctx, name, emptyGetOptions)
}
func (in *K8SClient) GetStatefulSets(namespace string) ([]apps_v1.StatefulSet, error) {
if ssList, err := in.k8s.AppsV1().StatefulSets(namespace).List(in.ctx, emptyListOptions); err == nil {
return ssList.Items, nil
} else {
return []apps_v1.StatefulSet{}, err
}
}
func (in *K8SClient) GetReplicationControllers(namespace string) ([]core_v1.ReplicationController, error) {
if rcList, err := in.k8s.CoreV1().ReplicationControllers(namespace).List(in.ctx, emptyListOptions); err == nil {
return rcList.Items, nil
} else {
return []core_v1.ReplicationController{}, err
}
}
// GetService returns the definition of a specific service.
// It returns an error on any problem.
func (in *K8SClient) GetService(namespace, name string) (*core_v1.Service, error) {
return in.k8s.CoreV1().Services(namespace).Get(in.ctx, name, emptyGetOptions)
}
// GetEndpoints return the list of endpoint of a specific service.
// It returns an error on any problem.
func (in *K8SClient) GetEndpoints(namespace, name string) (*core_v1.Endpoints, error) {
return in.k8s.CoreV1().Endpoints(namespace).Get(in.ctx, name, emptyGetOptions)
}
// GetPods returns the pods definitions for a given set of labels.
// An empty labelSelector will fetch all pods found per a namespace.
// It returns an error on any problem.
func (in *K8SClient) GetPods(namespace, labelSelector string) ([]core_v1.Pod, error) {
// An empty selector is ambiguous in the go client, could mean either "select all" or "select none"
// Here we assume empty == select all
// (see also https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors)
if pods, err := in.k8s.CoreV1().Pods(namespace).List(in.ctx, meta_v1.ListOptions{LabelSelector: labelSelector}); err == nil {
return pods.Items, nil
} else {
return []core_v1.Pod{}, err
}
}
// GetPodPortForwarder returns a port-forwarder struct which represents an open server forwarding request to the
// requested pod and port
// namespace: name of the namespace where the pod lives in.
// name: name of the pod living in the namespace
// portMap: ports open by the forwarder. Local port and destination port. Format: "80:8080" (local:destination)
// It returns both a portforwarder and an error (if present)
func (in *K8SClient) GetPodPortForwarder(namespace, name, portMap string) (*httputil.PortForwarder, error) {
writer := new(bytes.Buffer)
clientConfig, err := ConfigClient()
if err != nil {
log.Errorf("Error getting Kubernetes Client config: %v", err)
return nil, err
}
// First try whether the pod exist or not
pod, err := in.GetPod(namespace, name)
if err != nil {
log.Errorf("Couldn't fetch the Pod: %v", err)
return nil, err
}
// Prevent the forward if the pod is not running
if pod.Status.Phase != core_v1.PodRunning {
return nil, fmt.Errorf("error creating a pod forwarder for a non-running pod: %s/%s", namespace, name)
}
// Create a Port Forwarder
restInterface := in.k8s.CoreV1().RESTClient()
return httputil.NewPortForwarder(&restInterface, clientConfig,
namespace, name, "localhost", portMap, writer)
}
// GetPod returns the pod definitions for a given pod name.
// It returns an error on any problem.
func (in *K8SClient) GetPod(namespace, name string) (*core_v1.Pod, error) {
if pod, err := in.k8s.CoreV1().Pods(namespace).Get(in.ctx, name, emptyGetOptions); err != nil {
return nil, err
} else {
return pod, nil
}
}
// GetPod returns the pod definitions for a given pod name.
// It returns an error on any problem.
func (in *K8SClient) GetPodLogs(namespace, name string, opts *core_v1.PodLogOptions) (*PodLogs, error) {
req := in.k8s.CoreV1().RESTClient().Get().Namespace(namespace).Name(name).Resource("pods").SubResource("log").VersionedParams(opts, scheme.ParameterCodec)
readCloser, err := req.Stream(in.ctx)
if err != nil {
return nil, err
}
defer readCloser.Close()
buf := new(bytes.Buffer)
_, err = buf.ReadFrom(readCloser)
if err != nil {
return nil, err
}
return &PodLogs{Logs: buf.String()}, nil
}
func (in *K8SClient) GetCronJobs(namespace string) ([]batch_v1beta1.CronJob, error) {
if cjList, err := in.k8s.BatchV1beta1().CronJobs(namespace).List(in.ctx, emptyListOptions); err == nil {
return cjList.Items, nil
} else {
return []batch_v1beta1.CronJob{}, err
}
}
func (in *K8SClient) GetJobs(namespace string) ([]batch_v1.Job, error) {
if jList, err := in.k8s.BatchV1().Jobs(namespace).List(in.ctx, emptyListOptions); err == nil {
return jList.Items, nil
} else {
return []batch_v1.Job{}, err
}
}
// NewNotFound is a helper method to create a NotFound error similar as used by the kubernetes client.
// This method helps upper layers to send a explicit NotFound error without querying the backend.
func NewNotFound(name, group, resource string) error {
return errors.NewNotFound(schema.GroupResource{Group: group, Resource: resource}, name)
}
// GetSelfSubjectAccessReview provides information on Kiali permissions
func (in *K8SClient) GetSelfSubjectAccessReview(namespace, api, resourceType string, verbs []string) ([]*auth_v1.SelfSubjectAccessReview, error) {
calls := len(verbs)
ch := make(chan *auth_v1.SelfSubjectAccessReview, calls)
errChan := make(chan error)
for _, v := range verbs {
go func(verb string) {
res, err := in.k8s.AuthorizationV1().SelfSubjectAccessReviews().Create(in.ctx, &auth_v1.SelfSubjectAccessReview{
Spec: auth_v1.SelfSubjectAccessReviewSpec{
ResourceAttributes: &auth_v1.ResourceAttributes{
Namespace: namespace,
Verb: verb,
Group: api,
Resource: resourceType,
},
},
}, meta_v1.CreateOptions{})
if err != nil {
errChan <- err
} else {
ch <- res
}
}(v)
}
var err error
result := []*auth_v1.SelfSubjectAccessReview{}
for count := 0; count < calls; count++ {
select {
case res := <-ch:
result = append(result, res)
case err = <-errChan:
// No op
}
}
return result, err
}
func (in *K8SClient) UpdateWorkload(namespace string, workloadName string, workloadType string, jsonPatch string) error {
emptyPatchOptions := meta_v1.PatchOptions{}
bytePatch := []byte(jsonPatch)
var err error
switch workloadType {
case DeploymentType:
_, err = in.k8s.AppsV1().Deployments(namespace).Patch(in.ctx, workloadName, types.MergePatchType, bytePatch, emptyPatchOptions)
case ReplicaSetType:
_, err = in.k8s.AppsV1().ReplicaSets(namespace).Patch(in.ctx, workloadName, types.MergePatchType, bytePatch, emptyPatchOptions)
case ReplicationControllerType:
_, err = in.k8s.CoreV1().ReplicationControllers(namespace).Patch(in.ctx, workloadName, types.MergePatchType, bytePatch, emptyPatchOptions)
case DeploymentConfigType:
if in.IsOpenShift() {
result := &osapps_v1.DeploymentConfigList{}
err = in.k8s.RESTClient().Patch(types.MergePatchType).Prefix("apis", "apps.openshift.io", "v1").Namespace(namespace).Resource("deploymentconfigs").SubResource(workloadName).Body(bytePatch).Do(in.ctx).Into(result)
}
case StatefulSetType:
_, err = in.k8s.AppsV1().StatefulSets(namespace).Patch(in.ctx, workloadName, types.MergePatchType, bytePatch, emptyPatchOptions)
case JobType:
_, err = in.k8s.BatchV1().Jobs(namespace).Patch(in.ctx, workloadName, types.MergePatchType, bytePatch, emptyPatchOptions)
case CronJobType:
_, err = in.k8s.BatchV1beta1().CronJobs(namespace).Patch(in.ctx, workloadName, types.MergePatchType, bytePatch, emptyPatchOptions)
case PodType:
_, err = in.k8s.CoreV1().Pods(namespace).Patch(in.ctx, workloadName, types.MergePatchType, bytePatch, emptyPatchOptions)
case DaemonSetType:
_, err = in.k8s.AppsV1().DaemonSets(namespace).Patch(in.ctx, workloadName, types.MergePatchType, bytePatch, emptyPatchOptions)
default:
err = fmt.Errorf("Workload type %s not found", workloadType)
}
return err
}
func (in *K8SClient) UpdateService(namespace string, name string, jsonPatch string) error {
emptyPatchOptions := meta_v1.PatchOptions{}
bytePatch := []byte(jsonPatch)
var err error
_, err = in.k8s.CoreV1().Services(namespace).Patch(in.ctx, name, types.MergePatchType, bytePatch, emptyPatchOptions)
return err
}
func (in *K8SClient) UpdateNamespace(namespace string, jsonPatch string) (*core_v1.Namespace, error) {
emptyPatchOptions := meta_v1.PatchOptions{}
bytePatch := []byte(jsonPatch)
ns, err := in.k8s.CoreV1().Namespaces().Patch(in.ctx, namespace, types.MergePatchType, bytePatch, emptyPatchOptions)
if err != nil {
return &core_v1.Namespace{}, err
}
return ns, nil
}
func (in *K8SClient) UpdateProject(namespace string, jsonPatch string) (*osproject_v1.Project, error) {
result := &osproject_v1.Project{}
bytePatch := []byte(jsonPatch)
err := in.k8s.RESTClient().Patch(types.MergePatchType).Prefix("apis", "project.openshift.io", "v1", "projects", namespace).Body(bytePatch).Do(in.ctx).Into(result)
if err != nil {
return nil, err
}
return result, nil
}
// GetTokenSubject returns the subject of the authInfo using
// the TokenReview api
func (in *K8SClient) GetTokenSubject(authInfo *api.AuthInfo) (string, error) {
tokenReview := &v1.TokenReview{}
tokenReview.Spec.Token = authInfo.Token
result, err := in.k8s.AuthenticationV1().TokenReviews().Create(in.ctx, tokenReview, meta_v1.CreateOptions{})
if err != nil {
return "", err
} else if result.Status.Error != "" {
return "", goerrors.New(result.Status.Error)
} else {
return result.Status.User.Username, nil
}
}