/
node.go
268 lines (230 loc) · 6.51 KB
/
node.go
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package dao
import (
"context"
"fmt"
"io"
"github.com/kswapd/k13s/internal"
"github.com/kswapd/k13s/internal/client"
"github.com/kswapd/k13s/internal/render"
"github.com/rs/zerolog/log"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/kubernetes"
"k8s.io/kubectl/pkg/drain"
"k8s.io/kubectl/pkg/scheme"
mv1beta1 "k8s.io/metrics/pkg/apis/metrics/v1beta1"
)
var (
_ Accessor = (*Node)(nil)
_ NodeMaintainer = (*Node)(nil)
)
// NodeMetricsFunc retrieves node metrics.
type NodeMetricsFunc func() (*mv1beta1.NodeMetricsList, error)
// Node represents a node model.
type Node struct {
Resource
}
// ToggleCordon toggles cordon/uncordon a node.
func (n *Node) ToggleCordon(path string, cordon bool) error {
log.Debug().Msgf("CORDON %q::%t -- %q", path, cordon, n.gvr.GVK())
o, err := FetchNode(context.Background(), n.Factory, path)
if err != nil {
return err
}
h, err := drain.NewCordonHelperFromRuntimeObject(o, scheme.Scheme, n.gvr.GVK())
if err != nil {
log.Debug().Msgf("BOOM %v", err)
return err
}
if !h.UpdateIfRequired(cordon) {
if cordon {
return fmt.Errorf("node is already cordoned")
}
return fmt.Errorf("node is already uncordoned")
}
dial, err := n.GetFactory().Client().Dial()
if err != nil {
return err
}
err, patchErr := h.PatchOrReplace(dial, false)
if patchErr != nil {
return patchErr
}
if err != nil {
return err
}
return nil
}
func (o DrainOptions) toDrainHelper(k kubernetes.Interface, w io.Writer) drain.Helper {
return drain.Helper{
Client: k,
GracePeriodSeconds: o.GracePeriodSeconds,
Timeout: o.Timeout,
DeleteEmptyDirData: o.DeleteEmptyDirData,
IgnoreAllDaemonSets: o.IgnoreAllDaemonSets,
Out: w,
ErrOut: w,
}
}
// Drain drains a node.
func (n *Node) Drain(path string, opts DrainOptions, w io.Writer) error {
_ = n.ToggleCordon(path, true)
dial, err := n.GetFactory().Client().Dial()
if err != nil {
return err
}
h := opts.toDrainHelper(dial, w)
dd, errs := h.GetPodsForDeletion(path)
if len(errs) != 0 {
for _, e := range errs {
if _, err := h.ErrOut.Write([]byte(e.Error() + "\n")); err != nil {
return err
}
}
return errs[0]
}
if err := h.DeleteOrEvictPods(dd.Pods()); err != nil {
return err
}
fmt.Fprintf(h.Out, "Node %s drained!", path)
return nil
}
// Get returns a node resource.
func (n *Node) Get(ctx context.Context, path string) (runtime.Object, error) {
oo, err := n.Resource.List(ctx, "")
if err != nil {
return nil, err
}
var raw *unstructured.Unstructured
for _, o := range oo {
if u, ok := o.(*unstructured.Unstructured); ok && u.GetName() == path {
raw = u
}
}
if raw == nil {
return nil, fmt.Errorf("unable to locate node %s", path)
}
var nmx *mv1beta1.NodeMetrics
if withMx, ok := ctx.Value(internal.KeyWithMetrics).(bool); withMx || !ok {
nmx, _ = client.DialMetrics(n.Client()).FetchNodeMetrics(ctx, path)
}
return &render.NodeWithMetrics{Raw: raw, MX: nmx}, nil
}
// List returns a collection of node resources.
func (n *Node) List(ctx context.Context, ns string) ([]runtime.Object, error) {
oo, err := n.Resource.List(ctx, ns)
if err != nil {
return oo, err
}
var nmx client.NodesMetricsMap
if withMx, ok := ctx.Value(internal.KeyWithMetrics).(bool); withMx || !ok {
nmx, _ = client.DialMetrics(n.Client()).FetchNodesMetricsMap(ctx)
}
res := make([]runtime.Object, 0, len(oo))
for _, o := range oo {
u, ok := o.(*unstructured.Unstructured)
if !ok {
return res, fmt.Errorf("expecting *unstructured.Unstructured but got `%T", o)
}
fqn := extractFQN(o)
_, name := client.Namespaced(fqn)
podCount, err := n.CountPods(name)
if err != nil {
return nil, err
}
res = append(res, &render.NodeWithMetrics{
Raw: u,
MX: nmx[name],
PodCount: podCount,
})
}
return res, nil
}
// CountPods counts the pods scheduled on a given node.
func (n *Node) CountPods(nodeName string) (int, error) {
var count int
oo, err := n.GetFactory().List("v1/pods", client.AllNamespaces, false, labels.Everything())
if err != nil {
return 0, err
}
for _, o := range oo {
u, ok := o.(*unstructured.Unstructured)
if !ok {
return count, fmt.Errorf("expecting *unstructured.Unstructured but got `%T", o)
}
spec, ok := u.Object["spec"].(map[string]interface{})
if !ok {
return count, fmt.Errorf("expecting interface map but got `%T", o)
}
if node, ok := spec["nodeName"]; ok && node == nodeName {
count++
}
}
return count, nil
}
// GetPods returns all pods running on given node.
func (n *Node) GetPods(nodeName string) ([]*v1.Pod, error) {
oo, err := n.GetFactory().List("v1/pods", client.AllNamespaces, false, labels.Everything())
if err != nil {
return nil, err
}
pp := make([]*v1.Pod, 0, len(oo))
for _, o := range oo {
po := new(v1.Pod)
if err := runtime.DefaultUnstructuredConverter.FromUnstructured(o.(*unstructured.Unstructured).Object, po); err != nil {
return nil, err
}
if po.Spec.NodeName == nodeName {
pp = append(pp, po)
}
}
return pp, nil
}
// ----------------------------------------------------------------------------
// Helpers...
// FetchNode retrieves a node.
func FetchNode(ctx context.Context, f Factory, path string) (*v1.Node, error) {
auth, err := f.Client().CanI(client.ClusterScope, "v1/nodes", []string{"get"})
if err != nil {
return nil, err
}
if !auth {
return nil, fmt.Errorf("user is not authorized to list nodes")
}
o, err := f.Get("v1/nodes", client.FQN(client.ClusterScope, path), false, labels.Everything())
if err != nil {
return nil, err
}
var node v1.Node
err = runtime.DefaultUnstructuredConverter.FromUnstructured(o.(*unstructured.Unstructured).Object, &node)
if err != nil {
return nil, err
}
return &node, nil
}
// FetchNodes retrieves all nodes.
func FetchNodes(ctx context.Context, f Factory, labelsSel string) (*v1.NodeList, error) {
auth, err := f.Client().CanI(client.ClusterScope, "v1/nodes", []string{client.ListVerb})
if err != nil {
return nil, err
}
if !auth {
return nil, fmt.Errorf("user is not authorized to list nodes")
}
oo, err := f.List("v1/nodes", "", false, labels.Everything())
if err != nil {
return nil, err
}
nn := make([]v1.Node, 0, len(oo))
for _, o := range oo {
var node v1.Node
err = runtime.DefaultUnstructuredConverter.FromUnstructured(o.(*unstructured.Unstructured).Object, &node)
if err != nil {
return nil, err
}
nn = append(nn, node)
}
return &v1.NodeList{Items: nn}, nil
}