/
nodes_controller.go
123 lines (108 loc) · 2.88 KB
/
nodes_controller.go
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package k8s
import (
"context"
"fmt"
"time"
"github.com/vladimirvivien/ktop/views/model"
coreV1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
"k8s.io/apimachinery/pkg/labels"
metricsV1beta1 "k8s.io/metrics/pkg/apis/metrics/v1beta1"
)
func (c *Controller) GetNode(ctx context.Context, nodeName string) (*coreV1.Node, error) {
if ctx.Err() != nil {
return nil, ctx.Err()
}
node, err := c.nodeInformer.Lister().Get(nodeName)
if err != nil {
return nil, err
}
return node, nil
}
func (c *Controller) GetNodeList(ctx context.Context) ([]*coreV1.Node, error) {
if ctx.Err() != nil {
return nil, ctx.Err()
}
if err := c.assertNodeAuthz(ctx); err != nil {
return nil, err
}
items, err := c.nodeInformer.Lister().List(labels.Everything())
if err != nil {
return nil, err
}
return items, nil
}
func (c *Controller) GetNodeModels(ctx context.Context) (models []model.NodeModel, err error) {
nodes, err := c.GetNodeList(ctx)
if err != nil {
return
}
// map each node to their pods
pods, err := c.GetPodList(ctx)
if err != nil {
return nil, err
}
for _, node := range nodes {
metrics, err := c.GetNodeMetrics(ctx, node.Name)
if err != nil {
metrics = new(metricsV1beta1.NodeMetrics)
}
nodePods := getPodNodes(node.Name, pods)
podsCount := len(nodePods)
nodeModel := model.NewNodeModel(node, metrics)
nodeModel.PodsCount = podsCount
nodeModel.RequestedPodMemQty = resource.NewQuantity(0, resource.DecimalSI)
nodeModel.RequestedPodCpuQty = resource.NewQuantity(0, resource.DecimalSI)
for _, pod := range nodePods {
summary := model.GetPodContainerSummary(pod)
nodeModel.RequestedPodMemQty.Add(*summary.RequestedMemQty)
nodeModel.RequestedPodCpuQty.Add(*summary.RequestedCpuQty)
}
models = append(models, *nodeModel)
}
return
}
func (c *Controller) assertNodeAuthz(ctx context.Context) error {
authzd, err := c.client.IsAuthz(ctx, "nodes", []string{"get", "list"})
if err != nil {
return fmt.Errorf("failed to check node authorization: %w", err)
}
if !authzd {
return fmt.Errorf("node get, list not authorized")
}
return nil
}
func (c *Controller) setupNodeHandler(ctx context.Context, handlerFunc RefreshNodesFunc) {
go func() {
c.refreshNodes(ctx, handlerFunc) // initial refresh
ticker := time.NewTicker(5 * time.Second)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
if err := c.refreshNodes(ctx, handlerFunc); err != nil {
continue
}
}
}
}()
}
func (c *Controller) refreshNodes(ctx context.Context, handlerFunc RefreshNodesFunc) error {
models, err := c.GetNodeModels(ctx)
if err != nil {
return err
}
handlerFunc(ctx, models)
return nil
}
func getPodNodes(nodeName string, pods []*coreV1.Pod) []*coreV1.Pod {
var result []*coreV1.Pod
for _, pod := range pods {
if pod.Spec.NodeName == nodeName {
result = append(result, pod)
}
}
return result
}