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cluster.go
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cluster.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of K9s
package model
import (
"context"
"errors"
"time"
"github.com/derailed/k9s/internal/client"
"github.com/derailed/k9s/internal/dao"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/util/cache"
mv1beta1 "k8s.io/metrics/pkg/apis/metrics/v1beta1"
)
const (
clusterCacheSize = 100
clusterCacheExpiry = 1 * time.Minute
clusterNodesKey = "nodes"
)
type (
// MetricsServer gather metrics information from pods and nodes.
MetricsServer interface {
MetricsService
ClusterLoad(*v1.NodeList, *mv1beta1.NodeMetricsList, *client.ClusterMetrics) error
NodesMetrics(*v1.NodeList, *mv1beta1.NodeMetricsList, client.NodesMetrics)
PodsMetrics(*mv1beta1.PodMetricsList, client.PodsMetrics)
}
// MetricsService calls the metrics server for metrics info.
MetricsService interface {
HasMetrics() bool
FetchNodesMetrics(ctx context.Context) (*mv1beta1.NodeMetricsList, error)
FetchPodsMetrics(ctx context.Context, ns string) (*mv1beta1.PodMetricsList, error)
}
// Cluster represents a kubernetes resource.
Cluster struct {
factory dao.Factory
mx MetricsServer
cache *cache.LRUExpireCache
}
)
// NewCluster returns a new cluster info resource.
func NewCluster(f dao.Factory) *Cluster {
return &Cluster{
factory: f,
mx: client.DialMetrics(f.Client()),
cache: cache.NewLRUExpireCache(clusterCacheSize),
}
}
// Version returns the current K8s cluster version.
func (c *Cluster) Version() string {
info, err := c.factory.Client().ServerVersion()
if err != nil || info == nil {
return client.NA
}
return info.GitVersion
}
// ContextName returns the context name.
func (c *Cluster) ContextName() string {
n, err := c.factory.Client().Config().CurrentContextName()
if err != nil {
return client.NA
}
return n
}
// ClusterName returns the context name.
func (c *Cluster) ClusterName() string {
n, err := c.factory.Client().Config().CurrentClusterName()
if err != nil {
return client.NA
}
return n
}
// UserName returns the user name.
func (c *Cluster) UserName() string {
n, err := c.factory.Client().Config().CurrentUserName()
if err != nil {
return client.NA
}
return n
}
// Metrics gathers node level metrics and compute utilization percentages.
func (c *Cluster) Metrics(ctx context.Context, mx *client.ClusterMetrics) error {
var (
nn *v1.NodeList
err error
)
if v, ok := c.cache.Get(clusterNodesKey); ok {
if nl, ok := v.(*v1.NodeList); ok {
nn = nl
}
} else {
if nn, err = dao.FetchNodes(ctx, c.factory, ""); err != nil {
return err
}
}
if nn == nil {
return errors.New("Unable to fetch nodes list")
}
if len(nn.Items) > 0 {
c.cache.Add(clusterNodesKey, nn, clusterCacheExpiry)
}
var nmx *mv1beta1.NodeMetricsList
if nmx, err = c.mx.FetchNodesMetrics(ctx); err != nil {
return err
}
return c.mx.ClusterLoad(nn, nmx, mx)
}