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Add describe control to all k8s resources #3589

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merged 3 commits into from
May 17, 2019
Merged

Add describe control to all k8s resources #3589

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9bfa151
Add kubectl describe package as dependency
qiell Mar 31, 2019
029bbbc
Add describe control to all k8s resources
qiell Apr 1, 2019
5a53ca3
Update rank of DeletePod control from 1 to 3
qiell May 17, 2019
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48 changes: 48 additions & 0 deletions probe/kubernetes/client.go
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Original file line number Diff line number Diff line change
@@ -1,9 +1,11 @@
package kubernetes

import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"strings"
"sync"
"time"
Expand All @@ -14,6 +16,7 @@ import (
snapshot "github.com/openebs/k8s-snapshot-client/snapshot/pkg/client/clientset/versioned"
"github.com/pborman/uuid"
log "github.com/sirupsen/logrus"
apiappsv1 "k8s.io/api/apps/v1"
apiappsv1beta1 "k8s.io/api/apps/v1beta1"
apibatchv1 "k8s.io/api/batch/v1"
apibatchv1beta1 "k8s.io/api/batch/v1beta1"
Expand All @@ -22,6 +25,7 @@ import (
apiextensionsv1beta1 "k8s.io/api/extensions/v1beta1"
storagev1 "k8s.io/api/storage/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
apimeta "k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
Expand All @@ -32,6 +36,8 @@ import (
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
kubectldescribe "k8s.io/kubernetes/pkg/kubectl/describe"
kubectl "k8s.io/kubernetes/pkg/kubectl/describe/versioned"
)

// Client keeps track of running kubernetes pods and services
Expand All @@ -55,12 +61,28 @@ type Client interface {
CloneVolumeSnapshot(namespaceID, volumeSnapshotID, persistentVolumeClaimID, capacity string) error
CreateVolumeSnapshot(namespaceID, persistentVolumeClaimID, capacity string) error
GetLogs(namespaceID, podID string, containerNames []string) (io.ReadCloser, error)
Describe(namespaceID, resourceID string, groupKind schema.GroupKind, restMapping apimeta.RESTMapping) (io.ReadCloser, error)
DeletePod(namespaceID, podID string) error
DeleteVolumeSnapshot(namespaceID, volumeSnapshotID string) error
ScaleUp(namespaceID, id string) error
ScaleDown(namespaceID, id string) error
}

// ResourceMap is the mapping of resource and their GroupKind
var ResourceMap = map[string]schema.GroupKind{
"Pod": {Group: apiv1.GroupName, Kind: "Pod"},
"Service": {Group: apiv1.GroupName, Kind: "Service"},
"Deployment": {Group: apiappsv1.GroupName, Kind: "Deployment"},
"DaemonSet": {Group: apiappsv1.GroupName, Kind: "DaemonSet"},
"StatefulSet": {Group: apiappsv1.GroupName, Kind: "StatefulSet"},
"Job": {Group: apibatchv1.GroupName, Kind: "Job"},
"CronJob": {Group: apibatchv1.GroupName, Kind: "CronJob"},
"Node": {Group: apiv1.GroupName, Kind: "Node"},
"PersistentVolume": {Group: apiv1.GroupName, Kind: "PersistentVolume"},
"PersistentVolumeClaim": {Group: apiv1.GroupName, Kind: "PersistentVolumeClaim"},
"StorageClass": {Group: storagev1.GroupName, Kind: "StorageClass"},
}

type client struct {
quit chan struct{}
client *kubernetes.Clientset
Expand Down Expand Up @@ -541,6 +563,32 @@ func (c *client) GetLogs(namespaceID, podID string, containerNames []string) (io
return NewLogReadCloser(readClosersWithLabel), nil
}

func (c *client) Describe(namespaceID, resourceID string, groupKind schema.GroupKind, restMapping apimeta.RESTMapping) (io.ReadCloser, error) {
readClosersWithLabel := map[io.ReadCloser]string{}
restConfig, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
describer, ok := kubectl.DescriberFor(groupKind, restConfig)
if !ok {
describer, ok = kubectl.GenericDescriberFor(&restMapping, restConfig)
if !ok {
return nil, errors.New("Resource not found")
}
}
describerSetting := kubectldescribe.DescriberSettings{
ShowEvents: true,
}
obj, err := describer.Describe(namespaceID, resourceID, describerSetting)
if err != nil {
return nil, err
}
formattedObj := ioutil.NopCloser(bytes.NewReader([]byte(obj)))
readClosersWithLabel[formattedObj] = "describe"

return NewLogReadCloser(readClosersWithLabel), nil
}

func (c *client) DeletePod(namespaceID, podID string) error {
return c.client.CoreV1().Pods(namespaceID).Delete(podID, &metav1.DeleteOptions{})
}
Expand Down
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