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feat: Provide Azure Data Explorer Scaler (kedacore#1488)
Signed-off-by: Yarden Siboni <yasiboni@microsoft.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| /* | ||
| 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 azure | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "strconv" | ||
|
|
||
| "github.com/Azure/azure-kusto-go/kusto" | ||
| "github.com/Azure/azure-kusto-go/kusto/data/table" | ||
| "github.com/Azure/azure-kusto-go/kusto/unsafe" | ||
| "github.com/Azure/go-autorest/autorest/azure/auth" | ||
| logf "sigs.k8s.io/controller-runtime/pkg/log" | ||
| ) | ||
|
|
||
| type DataExplorerMetadata struct { | ||
| ClientID string | ||
| ClientSecret string | ||
| DatabaseName string | ||
| Endpoint string | ||
| MetricName string | ||
| PodIdentity string | ||
| Query string | ||
| TenantID string | ||
| Threshold int64 | ||
| } | ||
|
|
||
| var azureDataExplorerLogger = logf.Log.WithName("azure_data_explorer_scaler") | ||
|
|
||
| func CreateAzureDataExplorerClient(metadata *DataExplorerMetadata) (*kusto.Client, error) { | ||
| authConfig, err := getDataExplorerAuthConfig(metadata) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to get data explorer auth config: %v", err) | ||
| } | ||
|
|
||
| client, err := kusto.New(metadata.Endpoint, kusto.Authorization{Config: *authConfig}) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create kusto client: %v", err) | ||
| } | ||
|
|
||
| return client, nil | ||
| } | ||
|
|
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| func getDataExplorerAuthConfig(metadata *DataExplorerMetadata) (*auth.AuthorizerConfig, error) { | ||
| var authConfig auth.AuthorizerConfig | ||
|
|
||
| if metadata.PodIdentity != "" { | ||
| authConfig = auth.NewMSIConfig() | ||
| azureDataExplorerLogger.Info("Creating Azure Data Explorer Client using Pod Identity") | ||
| return &authConfig, nil | ||
| } | ||
|
|
||
| if metadata.ClientID != "" && metadata.ClientSecret != "" && metadata.TenantID != "" { | ||
| authConfig = auth.NewClientCredentialsConfig(metadata.ClientID, metadata.ClientSecret, metadata.TenantID) | ||
| azureDataExplorerLogger.Info("Creating Azure Data Explorer Client using clientID, clientSecret and tenantID") | ||
| return &authConfig, nil | ||
| } | ||
|
|
||
| return nil, fmt.Errorf("missing credentials. please reconfigure your scaled object metadata") | ||
| } | ||
|
|
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| func GetAzureDataExplorerMetricValue(ctx context.Context, client *kusto.Client, db string, query string) (int64, error) { | ||
| azureDataExplorerLogger.Info("Querying Azure Data Explorer", "db", db, "query", query) | ||
|
|
||
| iter, err := client.Query(ctx, db, kusto.NewStmt("", kusto.UnsafeStmt(unsafe.Stmt{Add: true, SuppressWarning: false})).UnsafeAdd(query)) | ||
| if err != nil { | ||
| return -1, fmt.Errorf("failed to get azure data explorer metric result from query %s: %v", query, err) | ||
| } | ||
| defer iter.Stop() | ||
|
|
||
| row, err := iter.Next() | ||
| if err != nil { | ||
| return -1, fmt.Errorf("failed to get query %s result: %v", query, err) | ||
| } | ||
|
|
||
| if !row.ColumnTypes[0].Type.Valid() { | ||
| return -1, fmt.Errorf("column type %s is not valid", row.ColumnTypes[0].Type) | ||
| } | ||
|
|
||
| // Return error if there is more than one row. | ||
| _, err = iter.Next() | ||
| if err != io.EOF { | ||
| return -1, fmt.Errorf("query %s result had more than a single result row", query) | ||
| } | ||
|
|
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| metricValue, err := extractDataExplorerMetricValue(row) | ||
| if err != nil { | ||
| return -1, fmt.Errorf("failed to extract value from query %s: %v", query, err) | ||
| } | ||
|
|
||
| return metricValue, nil | ||
| } | ||
|
|
||
| func extractDataExplorerMetricValue(row *table.Row) (int64, error) { | ||
| if row == nil || len(row.ColumnTypes) == 0 { | ||
| return -1, fmt.Errorf("query has no results") | ||
| } | ||
|
|
||
| // Query result validation. | ||
| dataType := row.ColumnTypes[0].Type | ||
| if dataType == "real" || dataType == "int" || dataType == "long" { | ||
| value, err := strconv.Atoi(row.Values[0].String()) | ||
| if err != nil { | ||
| return -1, fmt.Errorf("failed to convert result %s to int", row.Values[0].String()) | ||
| } | ||
| if value < 0 { | ||
| return -1, fmt.Errorf("query result must be >= 0 but received: %d", value) | ||
| } | ||
| azureDataExplorerLogger.Info("Query Result", "value", value, "dataType", dataType) | ||
| return int64(value), nil | ||
| } | ||
|
|
||
| return -1, fmt.Errorf("failed to extract metric value from Data Explorer request") | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| /* | ||
| 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 azure | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| "github.com/Azure/azure-kusto-go/kusto/data/errors" | ||
| "github.com/Azure/azure-kusto-go/kusto/data/table" | ||
| "github.com/Azure/azure-kusto-go/kusto/data/types" | ||
| "github.com/Azure/azure-kusto-go/kusto/data/value" | ||
| ) | ||
|
|
||
| type testExtractDataExplorerMetricValue struct { | ||
| testRow *table.Row | ||
| isError bool | ||
| } | ||
|
|
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| type testGetDataExplorerAuthConfig struct { | ||
| testMetadata *DataExplorerMetadata | ||
| isError bool | ||
| } | ||
|
|
||
| var ( | ||
| clientID = "test_client_id" | ||
| rowName = "result" | ||
| rowType types.Column = "long" | ||
| rowValue int64 = 3 | ||
| podIdentity = "Azure" | ||
| secret = "test_secret" | ||
| tenantID = "test_tenant_id" | ||
| ) | ||
|
|
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| var testExtractDataExplorerMetricValues = []testExtractDataExplorerMetricValue{ | ||
| // pass | ||
| {testRow: &table.Row{ColumnTypes: table.Columns{{Name: rowName, Type: rowType}}, Values: value.Values{value.Long{Value: rowValue, Valid: true}}, Op: errors.OpQuery}, isError: false}, | ||
| // nil row - fail | ||
| {testRow: nil, isError: true}, | ||
| // Empty row - fail | ||
| {testRow: &table.Row{}, isError: true}, | ||
| // Metric value is not bigger than 0 - fail | ||
| {testRow: &table.Row{ColumnTypes: table.Columns{{Name: rowName, Type: rowType}}, Values: value.Values{value.Long{Value: -1, Valid: true}}, Op: errors.OpQuery}, isError: true}, | ||
| // Metric result is invalid - fail | ||
| {testRow: &table.Row{ColumnTypes: table.Columns{{Name: rowName, Type: rowType}}, Values: value.Values{value.String{Value: "invalid", Valid: true}}, Op: errors.OpQuery}, isError: true}, | ||
| // Metric Type is not valid - fail | ||
| {testRow: &table.Row{ColumnTypes: table.Columns{{Name: rowName, Type: "String"}}, Values: value.Values{value.Long{Value: rowValue, Valid: true}}, Op: errors.OpQuery}, isError: true}, | ||
| } | ||
|
|
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| var testGetDataExplorerAuthConfigs = []testGetDataExplorerAuthConfig{ | ||
| // Auth with aad app - pass | ||
| {testMetadata: &DataExplorerMetadata{ClientID: clientID, ClientSecret: secret, TenantID: tenantID}, isError: false}, | ||
| // Auth with podIdentity - pass | ||
| {testMetadata: &DataExplorerMetadata{PodIdentity: podIdentity}, isError: false}, | ||
| // Empty metadata - fail | ||
| {testMetadata: &DataExplorerMetadata{}, isError: true}, | ||
| // Empty tenantID - fail | ||
| {testMetadata: &DataExplorerMetadata{ClientID: clientID, ClientSecret: secret}, isError: true}, | ||
| // Empty clientID - fail | ||
| {testMetadata: &DataExplorerMetadata{ClientSecret: secret, TenantID: tenantID}, isError: true}, | ||
| // Empty clientSecret - fail | ||
| {testMetadata: &DataExplorerMetadata{ClientID: clientID, TenantID: tenantID}, isError: true}, | ||
| } | ||
|
|
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| func TestExtractDataExplorerMetricValue(t *testing.T) { | ||
| for _, testData := range testExtractDataExplorerMetricValues { | ||
| _, err := extractDataExplorerMetricValue(testData.testRow) | ||
| if err != nil && !testData.isError { | ||
| t.Error("Expected success but got error", err) | ||
| } | ||
| if testData.isError && err == nil { | ||
| t.Error("Expected error but got success") | ||
| } | ||
| } | ||
| } | ||
|
|
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| func TestGetDataExplorerAuthConfig(t *testing.T) { | ||
| for _, testData := range testGetDataExplorerAuthConfigs { | ||
| _, err := getDataExplorerAuthConfig(testData.testMetadata) | ||
| if err != nil && !testData.isError { | ||
| t.Error("Expected success but got error", err) | ||
| } | ||
| if testData.isError && err == nil { | ||
| t.Error("Expected error but got success") | ||
| } | ||
| } | ||
| } |
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