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azure_queue_scaler.go
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azure_queue_scaler.go
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/*
Copyright 2021 The KEDA Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package scalers
import (
"context"
"fmt"
"net/http"
"strconv"
"github.com/kedacore/keda/v2/pkg/scalers/azure"
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"
kedav1alpha1 "github.com/kedacore/keda/v2/apis/keda/v1alpha1"
kedautil "github.com/kedacore/keda/v2/pkg/util"
)
const (
queueLengthMetricName = "queueLength"
defaultTargetQueueLength = 5
externalMetricType = "External"
)
type azureQueueScaler struct {
metadata *azureQueueMetadata
podIdentity kedav1alpha1.PodIdentityProvider
httpClient *http.Client
}
type azureQueueMetadata struct {
targetQueueLength int
queueName string
connection string
accountName string
endpointSuffix string
scalerIndex int
}
var azureQueueLog = logf.Log.WithName("azure_queue_scaler")
// NewAzureQueueScaler creates a new scaler for queue
func NewAzureQueueScaler(config *ScalerConfig) (Scaler, error) {
meta, podIdentity, err := parseAzureQueueMetadata(config)
if err != nil {
return nil, fmt.Errorf("error parsing azure queue metadata: %s", err)
}
return &azureQueueScaler{
metadata: meta,
podIdentity: podIdentity,
httpClient: kedautil.CreateHTTPClient(config.GlobalHTTPTimeout, false),
}, nil
}
func parseAzureQueueMetadata(config *ScalerConfig) (*azureQueueMetadata, kedav1alpha1.PodIdentityProvider, error) {
meta := azureQueueMetadata{}
meta.targetQueueLength = defaultTargetQueueLength
if val, ok := config.TriggerMetadata[queueLengthMetricName]; ok {
queueLength, err := strconv.Atoi(val)
if err != nil {
azureQueueLog.Error(err, "Error parsing azure queue metadata", "queueLengthMetricName", queueLengthMetricName)
return nil, "", fmt.Errorf("error parsing azure queue metadata %s: %s", queueLengthMetricName, err.Error())
}
meta.targetQueueLength = queueLength
}
endpointSuffix, err := azure.ParseAzureStorageEndpointSuffix(config.TriggerMetadata, azure.QueueEndpoint)
if err != nil {
return nil, "", err
}
meta.endpointSuffix = endpointSuffix
if val, ok := config.TriggerMetadata["queueName"]; ok && val != "" {
meta.queueName = val
} else {
return nil, "", fmt.Errorf("no queueName given")
}
// before triggerAuthentication CRD, pod identity was configured using this property
if val, ok := config.TriggerMetadata["useAAdPodIdentity"]; ok && config.PodIdentity == "" {
if val == "true" {
config.PodIdentity = kedav1alpha1.PodIdentityProviderAzure
}
}
// If the Use AAD Pod Identity is not present, or set to "none"
// then check for connection string
switch config.PodIdentity {
case "", kedav1alpha1.PodIdentityProviderNone:
// Azure Queue Scaler expects a "connection" parameter in the metadata
// of the scaler or in a TriggerAuthentication object
if config.AuthParams["connection"] != "" {
// Found the connection in a parameter from TriggerAuthentication
meta.connection = config.AuthParams["connection"]
} else if config.TriggerMetadata["connectionFromEnv"] != "" {
meta.connection = config.ResolvedEnv[config.TriggerMetadata["connectionFromEnv"]]
}
if len(meta.connection) == 0 {
return nil, "", fmt.Errorf("no connection setting given")
}
case kedav1alpha1.PodIdentityProviderAzure:
// If the Use AAD Pod Identity is present then check account name
if val, ok := config.TriggerMetadata["accountName"]; ok && val != "" {
meta.accountName = val
} else {
return nil, "", fmt.Errorf("no accountName given")
}
default:
return nil, "", fmt.Errorf("pod identity %s not supported for azure storage queues", config.PodIdentity)
}
meta.scalerIndex = config.ScalerIndex
return &meta, config.PodIdentity, nil
}
// IsActive determines whether this scaler is currently active
func (s *azureQueueScaler) IsActive(ctx context.Context) (bool, error) {
length, err := azure.GetAzureQueueLength(
ctx,
s.httpClient,
s.podIdentity,
s.metadata.connection,
s.metadata.queueName,
s.metadata.accountName,
s.metadata.endpointSuffix,
)
if err != nil {
azureQueueLog.Error(err, "error)")
return false, err
}
return length > 0, nil
}
func (s *azureQueueScaler) Close(context.Context) error {
return nil
}
func (s *azureQueueScaler) GetMetricSpecForScaling(context.Context) []v2beta2.MetricSpec {
targetQueueLengthQty := resource.NewQuantity(int64(s.metadata.targetQueueLength), resource.DecimalSI)
externalMetric := &v2beta2.ExternalMetricSource{
Metric: v2beta2.MetricIdentifier{
Name: GenerateMetricNameWithIndex(s.metadata.scalerIndex, kedautil.NormalizeString(fmt.Sprintf("azure-queue-%s", s.metadata.queueName))),
},
Target: v2beta2.MetricTarget{
Type: v2beta2.AverageValueMetricType,
AverageValue: targetQueueLengthQty,
},
}
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 *azureQueueScaler) GetMetrics(ctx context.Context, metricName string, metricSelector labels.Selector) ([]external_metrics.ExternalMetricValue, error) {
queuelen, err := azure.GetAzureQueueLength(
ctx,
s.httpClient,
s.podIdentity,
s.metadata.connection,
s.metadata.queueName,
s.metadata.accountName,
s.metadata.endpointSuffix,
)
if err != nil {
azureQueueLog.Error(err, "error getting queue length")
return []external_metrics.ExternalMetricValue{}, err
}
metric := external_metrics.ExternalMetricValue{
MetricName: metricName,
Value: *resource.NewQuantity(int64(queuelen), resource.DecimalSI),
Timestamp: metav1.Now(),
}
return append([]external_metrics.ExternalMetricValue{}, metric), nil
}