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process_stats.go
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process_stats.go
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package actions
import (
"context"
"fmt"
"strconv"
"time"
"code.cloudfoundry.org/korifi/api/actions/shared"
"code.cloudfoundry.org/korifi/api/authorization"
"code.cloudfoundry.org/korifi/api/repositories"
korifiv1alpha1 "code.cloudfoundry.org/korifi/controllers/api/v1alpha1"
"code.cloudfoundry.org/korifi/tools"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metricsv1beta1 "k8s.io/metrics/pkg/apis/metrics/v1beta1"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
ApplicationContainerName = "application"
EnvCFInstanceIndex = "CF_INSTANCE_INDEX"
LabelGUID = "korifi.cloudfoundry.org/guid"
LabelVersion = "korifi.cloudfoundry.org/version"
stateStarting = "STARTING"
stateRunning = "RUNNING"
stateDown = "DOWN"
stateCrashed = "CRASHED"
)
//counterfeiter:generate -o fake -fake-name MetricsRepository . MetricsRepository
type (
MetricsRepository interface {
GetMetrics(ctx context.Context, authInfo authorization.Info, namespace string, podSelector client.MatchingLabels) ([]repositories.PodMetrics, error)
}
Usage struct {
Time *string
CPU *float64
Mem *int64
Disk *int64
}
PodStatsRecord struct {
Type string
Index int
State string `default:"DOWN"`
Usage Usage
MemQuota *int64
DiskQuota *int64
}
ProcessStats struct {
processRepo shared.CFProcessRepository
appRepo shared.CFAppRepository
metricsRepo MetricsRepository
}
)
func NewProcessStats(processRepo shared.CFProcessRepository, appRepo shared.CFAppRepository, metricsRepo MetricsRepository) *ProcessStats {
return &ProcessStats{
processRepo: processRepo,
appRepo: appRepo,
metricsRepo: metricsRepo,
}
}
func (a *ProcessStats) FetchStats(ctx context.Context, authInfo authorization.Info, processGUID string) ([]PodStatsRecord, error) {
processRecord, err := a.processRepo.GetProcess(ctx, authInfo, processGUID)
if err != nil {
return nil, err
}
appRecord, err := a.appRepo.GetApp(ctx, authInfo, processRecord.AppGUID)
if err != nil {
return nil, err
}
if appRecord.State == repositories.StoppedState {
return []PodStatsRecord{
{
Type: processRecord.Type,
Index: 0,
State: "DOWN",
},
}, nil
}
metrics, err := a.metricsRepo.GetMetrics(ctx, authInfo, appRecord.SpaceGUID, client.MatchingLabels{
korifiv1alpha1.CFAppGUIDLabelKey: appRecord.GUID,
LabelVersion: appRecord.Revision,
LabelGUID: processGUID,
})
if err != nil {
return nil, err
}
// Initialize records slice with the pod instances we expect to exist
records := make([]PodStatsRecord, processRecord.DesiredInstances)
for i := range records {
records[i] = PodStatsRecord{
Type: processRecord.Type,
Index: i,
State: stateDown,
}
}
for _, m := range metrics {
index, err := extractIndex(m.Pod)
if err != nil {
return nil, err
}
podState := getPodState(m.Pod)
if podState == stateDown {
continue
}
if index >= len(records) {
continue
}
records[index].State = podState
metricsMap := aggregateContainerMetrics(m.Metrics.Containers)
if len(metricsMap) == 0 {
continue
}
if cpuQuantity, ok := metricsMap["cpu"]; ok {
value := float64(cpuQuantity.ScaledValue(resource.Nano))
// CF tracks CPU usage as a percentage of cores used.
// Convert the number of nanoCPU to CPU for greatest accuracy.
percentage := value / 1e9
records[index].Usage.CPU = &percentage
}
if memQuantity, ok := metricsMap["memory"]; ok {
value := memQuantity.Value()
records[index].Usage.Mem = &value
}
if storageQuantity, ok := metricsMap["storage"]; ok {
value := storageQuantity.Value()
records[index].Usage.Disk = &value
}
time := m.Metrics.Timestamp.UTC().Format(time.RFC3339)
records[index].Usage.Time = &time
records[index].MemQuota = tools.PtrTo(megabytesToBytes(processRecord.MemoryMB))
records[index].DiskQuota = tools.PtrTo(megabytesToBytes(processRecord.DiskQuotaMB))
}
return records, nil
}
func extractIndex(pod corev1.Pod) (int, error) {
container, err := extractProcessContainer(pod.Spec.Containers)
if err != nil {
return 0, err
}
indexString, err := extractEnvVarFromContainer(*container, EnvCFInstanceIndex)
if err != nil {
return 0, err
}
index, err := strconv.Atoi(indexString)
if err != nil {
return 0, fmt.Errorf("%s is not a valid index: %w", EnvCFInstanceIndex, err)
}
if index < 0 {
return 0, fmt.Errorf("%s is not a valid index: instance indexes can't be negative", EnvCFInstanceIndex)
}
return index, nil
}
func extractProcessContainer(containers []corev1.Container) (*corev1.Container, error) {
for i, c := range containers {
if c.Name == ApplicationContainerName {
return &containers[i], nil
}
}
return nil, fmt.Errorf("container %q not found", ApplicationContainerName)
}
func extractEnvVarFromContainer(container corev1.Container, envVar string) (string, error) {
envs := container.Env
for _, e := range envs {
if e.Name == envVar {
return e.Value, nil
}
}
return "", fmt.Errorf("%s not set", envVar)
}
// Logic from Kubernetes in Action 2nd Edition - Ch 6.
// DOWN => !pod || !pod.conditions.PodScheduled
// CRASHED => any(pod.ContainerStatuses.State isA Terminated)
// RUNNING => pod.conditions.Ready
// STARTING => default
func getPodState(pod corev1.Pod) string {
// return running when all containers are ready
if podConditionStatus(pod, corev1.PodReady) {
return stateRunning
}
if !podConditionStatus(pod, corev1.PodScheduled) {
return stateDown
}
if podHasTerminatedContainer(pod) {
return stateCrashed
}
return stateStarting
}
func podHasTerminatedContainer(pod corev1.Pod) bool {
for _, cond := range pod.Status.ContainerStatuses {
if cond.State.Terminated != nil {
return true
}
}
return false
}
func podConditionStatus(pod corev1.Pod, conditionType corev1.PodConditionType) bool {
for _, cond := range pod.Status.Conditions {
if cond.Type == conditionType {
return cond.Status == corev1.ConditionTrue
}
}
return false
}
func aggregateContainerMetrics(containers []metricsv1beta1.ContainerMetrics) map[string]resource.Quantity {
metrics := map[string]resource.Quantity{}
for _, container := range containers {
for k, v := range container.Usage {
if value, ok := metrics[string(k)]; ok {
value.Add(v)
metrics[string(k)] = value
} else {
metrics[string(k)] = v
}
}
}
return metrics
}
func megabytesToBytes(mb int64) int64 {
return mb * 1024 * 1024
}