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usage.go
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usage.go
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package podusage
import (
"context"
"fmt"
"math"
"os"
"sort"
"sync"
"golang.org/x/sync/errgroup"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
corev1 "k8s.io/api/core/v1"
"github.com/domechn/kubectl-analyze/pkg/tabwriter"
metricsclientset "k8s.io/metrics/pkg/client/clientset/versioned"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
)
type UsageLister struct {
client kubernetes.Interface
metricsClient metricsclientset.Interface
writer tabwriter.Writer
}
type usageShowData struct {
namespace string
name string
container string
requestCPU *resource.Quantity
requestMemory *resource.Quantity
limitMemory *resource.Quantity
limitCPU *resource.Quantity
usageCPU *resource.Quantity
usageCPUPercentage string
usageMemory *resource.Quantity
usageMemroyPercentage string
}
func MustNew(restConfig *rest.Config) *UsageLister {
restConfig.Burst = math.MaxInt64
mcli := metricsclientset.NewForConfigOrDie(restConfig)
kcli := kubernetes.NewForConfigOrDie(restConfig)
writer := tabwriter.New(os.Stdout)
return &UsageLister{
client: kcli,
metricsClient: mcli,
writer: writer,
}
}
func (l *UsageLister) getPods(name, namespace, nodeName string) ([]corev1.Pod, error) {
if name == "" && namespace == "" && nodeName == "" {
return nil, fmt.Errorf("must set search options ")
}
if name != "" && namespace == "" {
return nil, fmt.Errorf("must set pod name when namespace is not empty ")
}
if name != "" && namespace != "" {
pod, err := l.client.CoreV1().Pods(namespace).Get(context.Background(), name, metav1.GetOptions{})
if err != nil {
return nil, err
}
return []corev1.Pod{*pod}, nil
}
listOptions := metav1.ListOptions{}
if nodeName != "" {
listOptions.FieldSelector = fmt.Sprintf("spec.nodeName=%s", nodeName)
}
pods, err := l.client.CoreV1().Pods(namespace).List(context.Background(), listOptions)
if err != nil {
return nil, err
}
return pods.Items, nil
}
func (l *UsageLister) FindUsageNotMatchRequest(name, namespace, nodeName string, multiple float64) ([]*usageShowData, error) {
pods, err := l.getPods(name, namespace, nodeName)
if err != nil {
return nil, err
}
filter := func(pod corev1.Pod) (*usageShowData, error) {
metrics, err := l.metricsClient.MetricsV1beta1().PodMetricses(pod.Namespace).Get(context.Background(), pod.Name, metav1.GetOptions{})
if err != nil {
if errors.IsNotFound(err) {
return nil, nil
}
return nil, err
}
for idx, container := range pod.Spec.Containers {
limit := container.Resources.Limits
req := container.Resources.Requests
reqMem := req.Memory().Value()
reqCPU := req.Cpu().MilliValue()
usage := metrics.Containers[idx].Usage
usageMem := usage.Memory().Value()
usageCPU := usage.Cpu().MilliValue()
usageMemPercentage, usageMemPercentageShow := beautyUsage(float64(usageMem), float64(reqMem))
usageCPUPercentage, usageCPUPercentageShow := beautyUsage(float64(usageCPU), float64(reqCPU))
b := (reqMem == 0 || reqCPU == 0) || (usageMemPercentage >= multiple || usageCPUPercentage >= multiple)
if b {
return &usageShowData{
name: pod.Name,
namespace: pod.Namespace,
container: container.Name,
requestMemory: req.Memory(),
requestCPU: req.Cpu(),
limitMemory: limit.Memory(),
limitCPU: limit.Cpu(),
usageMemory: usage.Memory(),
usageCPU: usage.Cpu(),
usageCPUPercentage: usageCPUPercentageShow,
usageMemroyPercentage: usageMemPercentageShow,
}, nil
}
}
return nil, nil
}
var lock sync.Mutex
var g errgroup.Group
var res []*usageShowData
for _, pod := range pods {
p := pod
g.Go(func() error {
if usage, err := filter(p); err != nil {
return err
} else if usage != nil {
lock.Lock()
res = append(res, usage)
lock.Unlock()
}
return nil
})
}
err = g.Wait()
return res, err
}
func (l *UsageLister) Print(data []*usageShowData) error {
if len(data) == 0 {
return l.writer.AppendAndFlush("Congratulations, all of the POD's resource definitions are perfect :)")
}
sort.Slice(data, func(i, j int) bool {
if data[i].usageCPUPercentage == "-" || data[i].usageMemroyPercentage == "-" {
return false
}
if data[j].usageCPUPercentage == "-" || data[j].usageMemroyPercentage == "-" {
return true
}
return data[i].name < data[j].name
})
l.writer.SetHeader([]string{"namespace", "name", "container", "cpu(percentage)", "cpu(usage/request/limit)", "memory(percentage)", "memory(usage/request/limit)"})
for _, val := range data {
l.writer.Append(
val.namespace, val.name, val.container,
val.usageCPUPercentage,
fmt.Sprintf("%dm / %dm / %dm", val.usageCPU.MilliValue(), val.requestCPU.MilliValue(), val.limitCPU.MilliValue()),
val.usageMemroyPercentage,
fmt.Sprintf("%dMi / %dMi / %dMi", val.usageMemory.Value()/(1024*1024), val.requestMemory.Value()/(1024*1024), val.limitMemory.Value()/(1024*1024)),
)
}
return l.writer.Render()
}
// beautyUsage returns rawData and format percentage of (usage / request)%
func beautyUsage(a, b float64) (float64, string) {
if b == 0 {
return 0, "-"
}
res := a / b
return res, fmt.Sprintf("%.1f%%", res*100)
}