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datadog_scaler.go
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datadog_scaler.go
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package scalers
import (
"context"
"fmt"
"strconv"
"strings"
"time"
"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"
datadog "github.com/DataDog/datadog-api-client-go/api/v1/datadog"
kedautil "github.com/kedacore/keda/v2/pkg/util"
)
type datadogScaler struct {
metadata *datadogMetadata
apiClient *datadog.APIClient
}
type valueType int
const (
average = iota
global
)
type datadogMetadata struct {
apiKey string
appKey string
datadogSite string
query string
queryValue int
vType valueType
metricName string
age int
}
var datadogLog = logf.Log.WithName("datadog_scaler")
// NewDatadogScaler creates a new Datadog scaler
func NewDatadogScaler(ctx context.Context, config *ScalerConfig) (Scaler, error) {
meta, err := parseDatadogMetadata(config)
if err != nil {
return nil, fmt.Errorf("error parsing Datadog metadata: %s", err)
}
apiClient, err := newDatadogConnection(ctx, meta, config)
if err != nil {
return nil, fmt.Errorf("error establishing Datadog connection: %s", err)
}
return &datadogScaler{
metadata: meta,
apiClient: apiClient,
}, nil
}
func parseDatadogMetadata(config *ScalerConfig) (*datadogMetadata, error) {
meta := datadogMetadata{}
if val, ok := config.TriggerMetadata["query"]; ok {
meta.query = val
} else {
return nil, fmt.Errorf("no query given")
}
if val, ok := config.TriggerMetadata["queryValue"]; ok {
queryValue, err := strconv.Atoi(val)
if err != nil {
return nil, fmt.Errorf("queryValue parsing error %s", err.Error())
}
meta.queryValue = queryValue
} else {
return nil, fmt.Errorf("no queryValue given")
}
if val, ok := config.TriggerMetadata["age"]; ok {
age, err := strconv.Atoi(val)
if err != nil {
return nil, fmt.Errorf("age parsing error %s", err.Error())
}
meta.age = age
} else {
meta.age = 90 // Default window 90 seconds
}
// For all the points in a given window, we take the rollup to the window size
rollup := fmt.Sprintf(".rollup(avg, %d)", meta.age)
meta.query += rollup
if val, ok := config.TriggerMetadata["type"]; ok {
val = strings.ToLower(val)
switch val {
case "average":
meta.vType = average
case "global":
meta.vType = global
default:
return nil, fmt.Errorf("type has to be global or average")
}
} else {
meta.vType = average // Default to average between pods
}
if val, ok := config.AuthParams["apiKey"]; ok {
meta.apiKey = val
} else {
return nil, fmt.Errorf("no api key given")
}
if val, ok := config.AuthParams["appKey"]; ok {
meta.appKey = val
} else {
return nil, fmt.Errorf("no app key given")
}
siteVal := "datadoghq.com"
if val, ok := config.AuthParams["datadogSite"]; ok && val != "" {
siteVal = val
}
meta.datadogSite = siteVal
metricName := meta.query[0:strings.Index(meta.query, "{")]
meta.metricName = GenerateMetricNameWithIndex(config.ScalerIndex, kedautil.NormalizeString(fmt.Sprintf("datadog-%s", metricName)))
return &meta, nil
}
// newDatddogConnection tests a connection to the Datadog API
func newDatadogConnection(ctx context.Context, meta *datadogMetadata, config *ScalerConfig) (*datadog.APIClient, error) {
ctx = context.WithValue(
ctx,
datadog.ContextAPIKeys,
map[string]datadog.APIKey{
"apiKeyAuth": {
Key: meta.apiKey,
},
"appKeyAuth": {
Key: meta.appKey,
},
},
)
ctx = context.WithValue(ctx,
datadog.ContextServerVariables,
map[string]string{
"site": meta.datadogSite,
})
configuration := datadog.NewConfiguration()
configuration.HTTPClient = kedautil.CreateHTTPClient(config.GlobalHTTPTimeout, false)
apiClient := datadog.NewAPIClient(configuration)
_, _, err := apiClient.AuthenticationApi.Validate(ctx)
if err != nil {
return nil, fmt.Errorf("error connecting to Datadog API endpoint: %v", err)
}
return apiClient, nil
}
// No need to close connections
func (s *datadogScaler) Close(context.Context) error {
return nil
}
// IsActive returns true if we are able to get metrics from Datadog
func (s *datadogScaler) IsActive(ctx context.Context) (bool, error) {
ctx = context.WithValue(
ctx,
datadog.ContextAPIKeys,
map[string]datadog.APIKey{
"apiKeyAuth": {
Key: s.metadata.apiKey,
},
"appKeyAuth": {
Key: s.metadata.appKey,
},
},
)
ctx = context.WithValue(ctx,
datadog.ContextServerVariables,
map[string]string{
"site": s.metadata.datadogSite,
})
resp, _, err := s.apiClient.MetricsApi.QueryMetrics(ctx, time.Now().Unix()-int64(s.metadata.age), time.Now().Unix(), s.metadata.query)
if err != nil {
return false, err
}
series := resp.GetSeries()
if len(series) == 0 {
return false, nil
}
points := series[0].GetPointlist()
if len(points) == 0 {
return false, nil
}
return true, nil
}
// getQueryResult returns result of the scaler query
func (s *datadogScaler) getQueryResult(ctx context.Context) (int, error) {
ctx = context.WithValue(
ctx,
datadog.ContextAPIKeys,
map[string]datadog.APIKey{
"apiKeyAuth": {
Key: s.metadata.apiKey,
},
"appKeyAuth": {
Key: s.metadata.appKey,
},
},
)
ctx = context.WithValue(ctx,
datadog.ContextServerVariables,
map[string]string{
"site": s.metadata.datadogSite,
})
resp, _, err := s.apiClient.MetricsApi.QueryMetrics(ctx, time.Now().Unix()-int64(s.metadata.age), time.Now().Unix(), s.metadata.query)
if err != nil {
return -1, fmt.Errorf("error when retrieving Datadog metrics: %s", err)
}
series := resp.GetSeries()
if len(series) == 0 {
return 0, fmt.Errorf("no Datadog metrics returned")
}
points := series[0].GetPointlist()
if len(points) == 0 || len(points[0]) < 2 {
return 0, fmt.Errorf("no Datadog metrics returned")
}
return int(*points[0][1]), nil
}
// GetMetricSpecForScaling returns the MetricSpec for the Horizontal Pod Autoscaler
func (s *datadogScaler) GetMetricSpecForScaling(context.Context) []v2beta2.MetricSpec {
externalMetric := new(v2beta2.ExternalMetricSource)
targetQueryValue := resource.NewQuantity(int64(s.metadata.queryValue), resource.DecimalSI)
switch s.metadata.vType {
case average:
externalMetric = &v2beta2.ExternalMetricSource{
Metric: v2beta2.MetricIdentifier{
Name: s.metadata.metricName,
},
Target: v2beta2.MetricTarget{
Type: v2beta2.AverageValueMetricType,
AverageValue: targetQueryValue,
},
}
case global:
externalMetric = &v2beta2.ExternalMetricSource{
Metric: v2beta2.MetricIdentifier{
Name: s.metadata.metricName,
},
Target: v2beta2.MetricTarget{
Type: v2beta2.ValueMetricType,
Value: targetQueryValue,
},
}
}
metricSpec := v2beta2.MetricSpec{
External: externalMetric, Type: externalMetricType,
}
return []v2beta2.MetricSpec{metricSpec}
}
// GetMetrics returns value for a supported metric and an error if there is a problem getting the metric
func (s *datadogScaler) GetMetrics(ctx context.Context, metricName string, metricSelector labels.Selector) ([]external_metrics.ExternalMetricValue, error) {
num, err := s.getQueryResult(ctx)
if err != nil {
datadogLog.Error(err, "error getting metrics from Datadog")
return []external_metrics.ExternalMetricValue{}, fmt.Errorf("error getting metrics from Datadog: %s", err)
}
metric := external_metrics.ExternalMetricValue{
MetricName: s.metadata.metricName,
Value: *resource.NewQuantity(int64(num), resource.DecimalSI),
Timestamp: metav1.Now(),
}
return append([]external_metrics.ExternalMetricValue{}, metric), nil
}