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metrics.go
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metrics.go
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package client
import (
"context"
"errors"
"fmt"
"math"
"strconv"
"time"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/cache"
mv1beta1 "k8s.io/metrics/pkg/apis/metrics/v1beta1"
)
const (
mxCacheSize = 100
mxCacheExpiry = 1 * time.Minute
)
// MetricsDial tracks global metric server handle.
var MetricsDial *MetricsServer
// DialMetrics dials the metrics server.
func DialMetrics(c Connection) *MetricsServer {
if MetricsDial == nil {
MetricsDial = NewMetricsServer(c)
}
return MetricsDial
}
// ResetMetrics resets the metric server handle.
func ResetMetrics() {
MetricsDial = nil
}
// MetricsServer serves cluster metrics for nodes and pods.
type MetricsServer struct {
Connection
cache *cache.LRUExpireCache
}
// NewMetricsServer return a metric server instance.
func NewMetricsServer(c Connection) *MetricsServer {
return &MetricsServer{
Connection: c,
cache: cache.NewLRUExpireCache(mxCacheSize),
}
}
// ClusterLoad retrieves all cluster nodes metrics.
func (m *MetricsServer) ClusterLoad(nos *v1.NodeList, nmx *mv1beta1.NodeMetricsList, mx *ClusterMetrics) error {
if nos == nil || nmx == nil {
return fmt.Errorf("invalid node or node metrics lists")
}
nodeMetrics := make(NodesMetrics, len(nos.Items))
for _, no := range nos.Items {
nodeMetrics[no.Name] = NodeMetrics{
AllocatableCPU: no.Status.Allocatable.Cpu().MilliValue(),
AllocatableMEM: no.Status.Allocatable.Memory().Value(),
}
}
for _, mx := range nmx.Items {
if node, ok := nodeMetrics[mx.Name]; ok {
node.CurrentCPU = mx.Usage.Cpu().MilliValue()
node.CurrentMEM = mx.Usage.Memory().Value()
nodeMetrics[mx.Name] = node
}
}
var ccpu, cmem, tcpu, tmem int64
for _, mx := range nodeMetrics {
ccpu += mx.CurrentCPU
cmem += mx.CurrentMEM
tcpu += mx.AllocatableCPU
tmem += mx.AllocatableMEM
}
mx.PercCPU, mx.PercMEM = ToPercentage(ccpu, tcpu), ToPercentage(cmem, tmem)
return nil
}
func (m *MetricsServer) checkAccess(ns, gvr, msg string) error {
if !m.HasMetrics() {
return errors.New("No metrics-server detected on cluster")
}
auth, err := m.CanI(ns, gvr, ListAccess)
if err != nil {
return err
}
if !auth {
return fmt.Errorf(msg)
}
return nil
}
// NodesMetrics retrieves metrics for a given set of nodes.
func (m *MetricsServer) NodesMetrics(nodes *v1.NodeList, metrics *mv1beta1.NodeMetricsList, mmx NodesMetrics) {
if nodes == nil || metrics == nil {
return
}
for _, no := range nodes.Items {
mmx[no.Name] = NodeMetrics{
AllocatableCPU: no.Status.Allocatable.Cpu().MilliValue(),
AllocatableMEM: ToMB(no.Status.Allocatable.Memory().Value()),
AllocatableEphemeral: ToMB(no.Status.Allocatable.StorageEphemeral().Value()),
TotalCPU: no.Status.Capacity.Cpu().MilliValue(),
TotalMEM: ToMB(no.Status.Capacity.Memory().Value()),
TotalEphemeral: ToMB(no.Status.Capacity.StorageEphemeral().Value()),
}
}
for _, c := range metrics.Items {
if mx, ok := mmx[c.Name]; ok {
mx.CurrentCPU = c.Usage.Cpu().MilliValue()
mx.CurrentMEM = ToMB(c.Usage.Memory().Value())
mx.AvailableCPU = mx.AllocatableCPU - mx.CurrentCPU
mx.AvailableMEM = mx.AllocatableMEM - mx.CurrentMEM
mmx[c.Name] = mx
}
}
}
// FetchNodesMetricsMap fetch node metrics as a map.
func (m *MetricsServer) FetchNodesMetricsMap(ctx context.Context) (NodesMetricsMap, error) {
mm, err := m.FetchNodesMetrics(ctx)
if err != nil {
return nil, err
}
hh := make(NodesMetricsMap, len(mm.Items))
for i := range mm.Items {
mx := mm.Items[i]
hh[mx.Name] = &mx
}
return hh, nil
}
// FetchNodesMetrics return all metrics for nodes.
func (m *MetricsServer) FetchNodesMetrics(ctx context.Context) (*mv1beta1.NodeMetricsList, error) {
const msg = "user is not authorized to list node metrics"
mx := new(mv1beta1.NodeMetricsList)
if err := m.checkAccess(ClusterScope, "metrics.k8s.io/v1beta1/nodes", msg); err != nil {
return mx, err
}
const key = "nodes"
if entry, ok := m.cache.Get(key); ok && entry != nil {
mxList, ok := entry.(*mv1beta1.NodeMetricsList)
if !ok {
return nil, fmt.Errorf("expected nodemetricslist but got %T", entry)
}
return mxList, nil
}
client, err := m.MXDial()
if err != nil {
return mx, err
}
mxList, err := client.MetricsV1beta1().NodeMetricses().List(ctx, metav1.ListOptions{})
if err != nil {
return mx, err
}
m.cache.Add(key, mxList, mxCacheExpiry)
return mxList, nil
}
// FetchNodeMetrics return all metrics for nodes.
func (m *MetricsServer) FetchNodeMetrics(ctx context.Context, n string) (*mv1beta1.NodeMetrics, error) {
const msg = "user is not authorized to list node metrics"
mx := new(mv1beta1.NodeMetrics)
if err := m.checkAccess(ClusterScope, "metrics.k8s.io/v1beta1/nodes", msg); err != nil {
return mx, err
}
mmx, err := m.FetchNodesMetricsMap(ctx)
if err != nil {
return nil, err
}
mx, ok := mmx[n]
if !ok {
return nil, fmt.Errorf("Unable to retrieve node metrics for %q", n)
}
return mx, nil
}
// FetchPodsMetricsMap fetch pods metrics as a map.
func (m *MetricsServer) FetchPodsMetricsMap(ctx context.Context, ns string) (PodsMetricsMap, error) {
mm, err := m.FetchPodsMetrics(ctx, ns)
if err != nil {
return nil, err
}
hh := make(PodsMetricsMap, len(mm.Items))
for i := range mm.Items {
mx := mm.Items[i]
hh[FQN(mx.Namespace, mx.Name)] = &mx
}
return hh, nil
}
// FetchPodsMetrics return all metrics for pods in a given namespace.
func (m *MetricsServer) FetchPodsMetrics(ctx context.Context, ns string) (*mv1beta1.PodMetricsList, error) {
mx := new(mv1beta1.PodMetricsList)
const msg = "user is not authorized to list pods metrics"
if ns == NamespaceAll {
ns = AllNamespaces
}
if err := m.checkAccess(ns, "metrics.k8s.io/v1beta1/pods", msg); err != nil {
return mx, err
}
key := FQN(ns, "pods")
if entry, ok := m.cache.Get(key); ok {
mxList, ok := entry.(*mv1beta1.PodMetricsList)
if !ok {
return mx, fmt.Errorf("expected podmetricslist but got %T", entry)
}
return mxList, nil
}
client, err := m.MXDial()
if err != nil {
return mx, err
}
mxList, err := client.MetricsV1beta1().PodMetricses(ns).List(ctx, metav1.ListOptions{})
if err != nil {
return mx, err
}
m.cache.Add(key, mxList, mxCacheExpiry)
return mxList, err
}
// FetchContainersMetrics returns a pod's containers metrics.
func (m *MetricsServer) FetchContainersMetrics(ctx context.Context, fqn string) (ContainersMetrics, error) {
mm, err := m.FetchPodMetrics(ctx, fqn)
if err != nil {
return nil, err
}
cmx := make(ContainersMetrics, len(mm.Containers))
for i := range mm.Containers {
c := mm.Containers[i]
cmx[c.Name] = &c
}
return cmx, nil
}
// FetchPodMetrics return all metrics for pods in a given namespace.
func (m *MetricsServer) FetchPodMetrics(ctx context.Context, fqn string) (*mv1beta1.PodMetrics, error) {
var mx *mv1beta1.PodMetrics
const msg = "user is not authorized to list pod metrics"
ns, _ := Namespaced(fqn)
if ns == NamespaceAll {
ns = AllNamespaces
}
if err := m.checkAccess(ns, "metrics.k8s.io/v1beta1/pods", msg); err != nil {
return mx, err
}
mmx, err := m.FetchPodsMetricsMap(ctx, ns)
if err != nil {
return nil, err
}
pmx, ok := mmx[fqn]
if !ok {
return nil, fmt.Errorf("Unable to locate pod metrics for pod %q", fqn)
}
return pmx, nil
}
// PodsMetrics retrieves metrics for all pods in a given namespace.
func (m *MetricsServer) PodsMetrics(pods *mv1beta1.PodMetricsList, mmx PodsMetrics) {
if pods == nil {
return
}
// Compute all pod's containers metrics.
for _, p := range pods.Items {
var mx PodMetrics
for _, c := range p.Containers {
mx.CurrentCPU += c.Usage.Cpu().MilliValue()
mx.CurrentMEM += ToMB(c.Usage.Memory().Value())
}
mmx[p.Namespace+"/"+p.Name] = mx
}
}
// ----------------------------------------------------------------------------
// Helpers...
// MegaByte represents a megabyte.
const MegaByte = 1024 * 1024
// ToMB converts bytes to megabytes.
func ToMB(v int64) int64 {
return v / MegaByte
}
// ToPercentage computes percentage as string otherwise n/aa.
func ToPercentage(v1, v2 int64) int {
if v2 == 0 {
return 0
}
return int(math.Floor((float64(v1) / float64(v2)) * 100))
}
// ToPercentageStr computes percentage, but if v2 is 0, it will return NAValue instead of 0.
func ToPercentageStr(v1, v2 int64) string {
if v2 == 0 {
return NA
}
return strconv.Itoa(ToPercentage(v1, v2))
}