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/
provider_external.go
71 lines (61 loc) · 2.4 KB
/
provider_external.go
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package provider
import (
"github.com/aws/aws-sdk-go/aws"
"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/klog"
"k8s.io/metrics/pkg/apis/external_metrics"
)
func (p *cloudwatchProvider) GetExternalMetric(namespace string, metricSelector labels.Selector, info provider.ExternalMetricInfo) (*external_metrics.ExternalMetricValueList, error) {
// Note:
// metric name and namespace is used to lookup for the CRD which contains configuration to
// call cloudwatch if not found then ignored and label selector is parsed for all the metrics
klog.V(0).Infof("Received request for namespace: %s, metric name: %s, metric selectors: %s", namespace, info.Metric, metricSelector.String())
_, selectable := metricSelector.Requirements()
if !selectable {
return nil, errors.NewBadRequest("label is set to not selectable. this should not happen")
}
externalRequest, found := p.metricCache.GetExternalMetric(namespace, info.Metric)
if !found {
return nil, errors.NewBadRequest("no metric query found")
}
metricValue, err := p.cwManager.QueryCloudWatch(externalRequest)
if err != nil {
klog.Errorf("bad request: %v", err)
return nil, errors.NewBadRequest(err.Error())
}
var quantity resource.Quantity
if len(metricValue) == 0 || len(metricValue[0].Values) == 0 {
quantity = *resource.NewMilliQuantity(0, resource.DecimalSI)
} else {
quantity = *resource.NewQuantity(int64(aws.Float64Value(metricValue[0].Values[0])), resource.DecimalSI)
}
externalMetricValue := external_metrics.ExternalMetricValue{
MetricName: info.Metric,
Value: quantity,
Timestamp: metav1.Now(),
}
matchingMetrics := []external_metrics.ExternalMetricValue{externalMetricValue}
return &external_metrics.ExternalMetricValueList{
Items: matchingMetrics,
}, nil
}
func (p *cloudwatchProvider) ListAllExternalMetrics() []provider.ExternalMetricInfo {
p.valuesLock.RLock()
defer p.valuesLock.RUnlock()
// not implemented yet
var externalMetricsInfo []provider.ExternalMetricInfo
for _, name := range p.metricCache.ListMetricNames() {
// only process if name is non-empty
if name != "" {
info := provider.ExternalMetricInfo{
Metric: name,
}
externalMetricsInfo = append(externalMetricsInfo, info)
}
}
return externalMetricsInfo
}