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newrelic_scaler.go
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newrelic_scaler.go
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package scalers
import (
"context"
"fmt"
"log"
"strconv"
"github.com/newrelic/newrelic-client-go/newrelic"
"github.com/newrelic/newrelic-client-go/pkg/nrdb"
v2beta2 "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"
logf "sigs.k8s.io/controller-runtime/pkg/log"
kedautil "github.com/kedacore/keda/v2/pkg/util"
)
const (
account = "account"
queryKey = "queryKey"
region = "region"
nrql = "nrql"
threshold = "threshold"
noDataError = "noDataError"
scalerName = "new-relic"
)
type newrelicScaler struct {
metadata *newrelicMetadata
nrClient *newrelic.NewRelic
}
type newrelicMetadata struct {
account int
region string
queryKey string
noDataError bool
nrql string
threshold int
scalerIndex int
}
var newrelicLog = logf.Log.WithName(fmt.Sprintf("%s_scaler", scalerName))
func NewNewRelicScaler(config *ScalerConfig) (Scaler, error) {
meta, err := parseNewRelicMetadata(config)
if err != nil {
return nil, fmt.Errorf("error parsing %s metadata: %s", scalerName, err)
}
nrClient, err := newrelic.New(
newrelic.ConfigPersonalAPIKey(meta.queryKey),
newrelic.ConfigRegion(meta.region))
if err != nil {
log.Fatal("error initializing client:", err)
}
logMsg := fmt.Sprintf("Initializing New Relic Scaler (account %d in region %s)", meta.account, meta.region)
newrelicLog.Info(logMsg)
return &newrelicScaler{
metadata: meta,
nrClient: nrClient}, nil
}
func parseNewRelicMetadata(config *ScalerConfig) (*newrelicMetadata, error) {
meta := newrelicMetadata{}
var err error
if val, ok := config.TriggerMetadata[account]; ok && val != "" {
t, err := strconv.Atoi(val)
if err != nil {
return nil, fmt.Errorf("error parsing %s: %s", account, err)
}
meta.account = t
} else {
return nil, fmt.Errorf("no %s given", account)
}
if val, ok := config.TriggerMetadata[nrql]; ok && val != "" {
meta.nrql = val
} else {
return nil, fmt.Errorf("no %s given", nrql)
}
meta.queryKey, err = GetFromAuthOrMeta(config, queryKey)
if err != nil {
return nil, fmt.Errorf("no %s given", queryKey)
}
meta.region, err = GetFromAuthOrMeta(config, region)
if err != nil {
meta.region = "US"
newrelicLog.Info("Using default 'US' region")
}
if val, ok := config.TriggerMetadata[threshold]; ok && val != "" {
t, err := strconv.Atoi(val)
if err != nil {
return nil, fmt.Errorf("error parsing %s", threshold)
}
meta.threshold = t
} else {
return nil, fmt.Errorf("missing %s value", threshold)
}
// If Query Return an Empty Data , shall we treat it as an error or not
// default is NO error is returned when query result is empty/no data
if val, ok := config.TriggerMetadata[noDataError]; ok {
noDataError, err := strconv.ParseBool(val)
if err != nil {
return nil, fmt.Errorf("noDataError has invalid value")
}
meta.noDataError = noDataError
} else {
meta.noDataError = false
}
meta.scalerIndex = config.ScalerIndex
return &meta, nil
}
func (s *newrelicScaler) IsActive(ctx context.Context) (bool, error) {
val, err := s.ExecuteNewRelicQuery(ctx)
if err != nil {
newrelicLog.Error(err, "error executing NRQL")
return false, err
}
return val > 0, nil
}
func (s *newrelicScaler) Close(context.Context) error {
return nil
}
func (s *newrelicScaler) ExecuteNewRelicQuery(ctx context.Context) (float64, error) {
nrdbQuery := nrdb.NRQL(s.metadata.nrql)
resp, err := s.nrClient.Nrdb.QueryWithContext(ctx, s.metadata.account, nrdbQuery)
if err != nil {
return 0, fmt.Errorf("error running NRQL %s (%s)", s.metadata.nrql, err.Error())
}
// Only use the first result from the query, as the query should not be multi row
for _, v := range resp.Results[0] {
val, ok := v.(float64)
if ok {
return val, nil
}
}
if s.metadata.noDataError {
return 0, fmt.Errorf("query return no results %s", s.metadata.nrql)
}
return 0, nil
}
func (s *newrelicScaler) GetMetrics(ctx context.Context, metricName string, metricSelector labels.Selector) ([]external_metrics.ExternalMetricValue, error) {
val, err := s.ExecuteNewRelicQuery(ctx)
if err != nil {
newrelicLog.Error(err, "error executing NRQL query")
return []external_metrics.ExternalMetricValue{}, err
}
metric := external_metrics.ExternalMetricValue{
MetricName: metricName,
Value: *resource.NewQuantity(int64(val), resource.DecimalSI),
Timestamp: metav1.Now(),
}
return append([]external_metrics.ExternalMetricValue{}, metric), nil
}
func (s *newrelicScaler) GetMetricSpecForScaling(context.Context) []v2beta2.MetricSpec {
targetMetricValue := resource.NewQuantity(int64(s.metadata.threshold), resource.DecimalSI)
metricName := kedautil.NormalizeString(scalerName)
externalMetric := &v2beta2.ExternalMetricSource{
Metric: v2beta2.MetricIdentifier{
Name: GenerateMetricNameWithIndex(s.metadata.scalerIndex, metricName),
},
Target: v2beta2.MetricTarget{
Type: v2beta2.AverageValueMetricType,
AverageValue: targetMetricValue,
},
}
metricSpec := v2beta2.MetricSpec{
External: externalMetric, Type: externalMetricType,
}
return []v2beta2.MetricSpec{metricSpec}
}