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cpu_memory_scaler.go
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cpu_memory_scaler.go
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package scalers
import (
"context"
"fmt"
"strconv"
"k8s.io/api/autoscaling/v2beta2"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/metrics/pkg/apis/external_metrics"
)
type cpuMemoryScaler struct {
metadata *cpuMemoryMetadata
resourceName v1.ResourceName
}
type cpuMemoryMetadata struct {
Type v2beta2.MetricTargetType
AverageValue *resource.Quantity
AverageUtilization *int32
}
// NewCPUMemoryScaler creates a new cpuMemoryScaler
func NewCPUMemoryScaler(resourceName v1.ResourceName, config *ScalerConfig) (Scaler, error) {
meta, parseErr := parseResourceMetadata(config)
if parseErr != nil {
return nil, fmt.Errorf("error parsing %s metadata: %s", resourceName, parseErr)
}
return &cpuMemoryScaler{
metadata: meta,
resourceName: resourceName,
}, nil
}
func parseResourceMetadata(config *ScalerConfig) (*cpuMemoryMetadata, error) {
meta := &cpuMemoryMetadata{}
if val, ok := config.TriggerMetadata["type"]; ok && val != "" {
meta.Type = v2beta2.MetricTargetType(val)
} else {
return nil, fmt.Errorf("no type given")
}
var value string
var ok bool
if value, ok = config.TriggerMetadata["value"]; !ok || value == "" {
return nil, fmt.Errorf("no value given")
}
switch meta.Type {
case v2beta2.AverageValueMetricType:
averageValueQuantity := resource.MustParse(value)
meta.AverageValue = &averageValueQuantity
case v2beta2.UtilizationMetricType:
valueNum, err := strconv.ParseInt(value, 10, 32)
if err != nil {
return nil, err
}
utilizationNum := int32(valueNum)
meta.AverageUtilization = &utilizationNum
default:
return nil, fmt.Errorf("unsupported metric type, allowed values are 'Utilization' or 'AverageValue'")
}
return meta, nil
}
// IsActive always return true for cpu/memory scaler
func (s *cpuMemoryScaler) IsActive(ctx context.Context) (bool, error) {
return true, nil
}
// Close no need for cpuMemory scaler
func (s *cpuMemoryScaler) Close(context.Context) error {
return nil
}
// GetMetricSpecForScaling returns the metric spec for the HPA
func (s *cpuMemoryScaler) GetMetricSpecForScaling(context.Context) []v2beta2.MetricSpec {
cpuMemoryMetric := &v2beta2.ResourceMetricSource{
Name: s.resourceName,
Target: v2beta2.MetricTarget{
Type: s.metadata.Type,
AverageUtilization: s.metadata.AverageUtilization,
AverageValue: s.metadata.AverageValue,
},
}
metricSpec := v2beta2.MetricSpec{Resource: cpuMemoryMetric, Type: v2beta2.ResourceMetricSourceType}
return []v2beta2.MetricSpec{metricSpec}
}
// GetMetrics no need for cpu/memory scaler
func (s *cpuMemoryScaler) GetMetrics(ctx context.Context, metricName string, metricSelector labels.Selector) ([]external_metrics.ExternalMetricValue, error) {
return nil, nil
}