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fallback.go
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fallback.go
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package provider
import (
"context"
"fmt"
kedav1alpha1 "github.com/kedacore/keda/v2/api/v1alpha1"
"github.com/kedacore/keda/v2/pkg/scalers"
"k8s.io/api/autoscaling/v2beta2"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/metrics/pkg/apis/external_metrics"
)
func isFallbackEnabled(scaledObject *kedav1alpha1.ScaledObject, metricSpec v2beta2.MetricSpec) bool {
return scaledObject.Spec.Fallback != nil && metricSpec.External.Target.Type == v2beta2.AverageValueMetricType
}
func (p *KedaProvider) getMetricsWithFallback(scaler scalers.Scaler, metricName string, metricSelector labels.Selector, scaledObject *kedav1alpha1.ScaledObject, metricSpec v2beta2.MetricSpec) ([]external_metrics.ExternalMetricValue, error) {
initHealthStatus(scaledObject)
metrics, err := scaler.GetMetrics(context.TODO(), metricName, metricSelector)
healthStatus := getHealthStatus(scaledObject, metricName)
if err == nil {
zero := int32(0)
healthStatus.NumberOfFailures = &zero
healthStatus.Status = kedav1alpha1.HealthStatusHappy
scaledObject.Status.Health[metricName] = *healthStatus
p.updateStatus(scaledObject, metricSpec)
return metrics, nil
}
healthStatus.Status = kedav1alpha1.HealthStatusFailing
*healthStatus.NumberOfFailures++
scaledObject.Status.Health[metricName] = *healthStatus
p.updateStatus(scaledObject, metricSpec)
switch {
case !isFallbackEnabled(scaledObject, metricSpec):
return nil, err
case !validateFallback(scaledObject):
logger.Info("Failed to validate ScaledObject Spec. Please check that parameters are positive integers")
return nil, err
case *healthStatus.NumberOfFailures > scaledObject.Spec.Fallback.FailureThreshold:
return doFallback(scaledObject, metricSpec, metricName, err), nil
default:
return nil, err
}
}
func fallbackExistsInScaledObject(scaledObject *kedav1alpha1.ScaledObject, metricSpec v2beta2.MetricSpec) bool {
if !isFallbackEnabled(scaledObject, metricSpec) || !validateFallback(scaledObject) {
return false
}
for _, element := range scaledObject.Status.Health {
if element.Status == kedav1alpha1.HealthStatusFailing && *element.NumberOfFailures > scaledObject.Spec.Fallback.FailureThreshold {
return true
}
}
return false
}
func validateFallback(scaledObject *kedav1alpha1.ScaledObject) bool {
return scaledObject.Spec.Fallback.FailureThreshold >= 0 &&
scaledObject.Spec.Fallback.Replicas >= 0
}
func doFallback(scaledObject *kedav1alpha1.ScaledObject, metricSpec v2beta2.MetricSpec, metricName string, suppressedError error) []external_metrics.ExternalMetricValue {
replicas := int64(scaledObject.Spec.Fallback.Replicas)
normalisationValue, _ := metricSpec.External.Target.AverageValue.AsInt64()
metric := external_metrics.ExternalMetricValue{
MetricName: metricName,
Value: *resource.NewQuantity(normalisationValue*replicas, resource.DecimalSI),
Timestamp: metav1.Now(),
}
fallbackMetrics := []external_metrics.ExternalMetricValue{metric}
logger.Info(fmt.Sprintf("Suppressing error %s, falling back to %d replicas", suppressedError, replicas))
return fallbackMetrics
}
func (p *KedaProvider) updateStatus(scaledObject *kedav1alpha1.ScaledObject, metricSpec v2beta2.MetricSpec) {
if fallbackExistsInScaledObject(scaledObject, metricSpec) {
scaledObject.Status.Conditions.SetFallbackCondition(metav1.ConditionTrue, "FallbackExists", "At least one trigger is falling back on this scaled object")
} else {
scaledObject.Status.Conditions.SetFallbackCondition(metav1.ConditionFalse, "NoFallbackFound", "No fallbacks are active on this scaled object")
}
err := p.client.Status().Update(context.TODO(), scaledObject)
if err != nil {
logger.Error(err, "Error updating ScaledObject status", "Error")
}
}
func getHealthStatus(scaledObject *kedav1alpha1.ScaledObject, metricName string) *kedav1alpha1.HealthStatus {
// Get health status for a specific metric
_, healthStatusExists := scaledObject.Status.Health[metricName]
if !healthStatusExists {
zero := int32(0)
status := kedav1alpha1.HealthStatus{
NumberOfFailures: &zero,
Status: kedav1alpha1.HealthStatusHappy,
}
scaledObject.Status.Health[metricName] = status
}
healthStatus := scaledObject.Status.Health[metricName]
return &healthStatus
}
func initHealthStatus(scaledObject *kedav1alpha1.ScaledObject) {
// Init health status if missing
if scaledObject.Status.Health == nil {
scaledObject.Status.Health = make(map[string]kedav1alpha1.HealthStatus)
}
}