Add armcostmanagement dep and blob StorageCostQuerier skeleton

Author: suntala

go.mod

@@ -10,6 +10,7 @@ require (
 	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.13.1
 	github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v7 v7.3.0
 	github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/containerservice/armcontainerservice/v8 v8.2.0
+	github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/costmanagement/armcostmanagement v1.1.1
 	github.com/Azure/go-autorest/autorest/to v0.4.1
 	github.com/aws/aws-sdk-go-v2 v1.41.4
 	github.com/aws/aws-sdk-go-v2/config v1.32.12
@@ -39,6 +40,7 @@ require (
 
 require (
 	cloud.google.com/go/managedkafka v0.8.1
+	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.20.0
 	github.com/aws/aws-sdk-go-v2/service/kafka v1.49.0
 )
 
@@ -50,7 +52,6 @@ require (
 	cloud.google.com/go/compute/metadata v0.9.0 // indirect
 	cloud.google.com/go/iam v1.6.0 // indirect
 	cloud.google.com/go/longrunning v0.8.0 // indirect
-	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.20.0 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.11.2 // indirect
 	github.com/Azure/go-autorest v14.2.0+incompatible // indirect
 	github.com/AzureAD/microsoft-authentication-library-for-go v1.6.0 // indirect

go.sum

@@ -38,6 +38,8 @@ github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v7 v7.3
 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v7 v7.3.0/go.mod h1:e4RAYykLIz73CF52KhSooo4whZGXvXrD09m0jkgnWiU=
 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/containerservice/armcontainerservice/v8 v8.2.0 h1:aXzpyYcHexm3eSlvy6g7r3cshXtGcEg6VJpOdrN0Us0=
 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/containerservice/armcontainerservice/v8 v8.2.0/go.mod h1:vs/o7so4c3csg/CM0LDrqxSKDxcKgeYbgI3zaL6vu7U=
+github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/costmanagement/armcostmanagement v1.1.1 h1:ehSLdbLah6kk6HTVc6e/lrbmbz7MMbpNxkOd3OYlhB0=
+github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/costmanagement/armcostmanagement v1.1.1/go.mod h1:Am1cUioOk0HdZIsjpXJkQ4RIeQbwYsW6LkNIc5z/5XY=
 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/internal/v3 v3.1.0 h1:2qsIIvxVT+uE6yrNldntJKlLRgxGbZ85kgtz5SNBhMw=
 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/internal/v3 v3.1.0/go.mod h1:AW8VEadnhw9xox+VaVd9sP7NjzOAnaZBLRH6Tq3cJ38=
 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/resources/armresources v1.2.0 h1:Dd+RhdJn0OTtVGaeDLZpcumkIVCtA/3/Fo42+eoYvVM=

pkg/azure/client/storage_cost_querier.go

@@ -0,0 +1,39 @@
+package client
+
+import (
+	"context"
+	"time"
+
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore"
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore/arm"
+	"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/costmanagement/armcostmanagement"
+
+	"github.com/grafana/cloudcost-exporter/pkg/azure/blob"
+)
+
+var _ blob.StorageCostQuerier = (*BlobStorageCostQuerier)(nil)
+
+// BlobStorageCostQuerier implements blob.StorageCostQuerier using Azure Cost Management QueryClient.
+// QueryBlobStorage returns no rows until a subscription-scoped Usage query is implemented.
+type BlobStorageCostQuerier struct {
+	query *armcostmanagement.QueryClient
+}
+
+// NewBlobStorageCostQuerier builds a querier backed by armcostmanagement.
+func NewBlobStorageCostQuerier(credential azcore.TokenCredential, options *arm.ClientOptions) (*BlobStorageCostQuerier, error) {
+	factory, err := armcostmanagement.NewClientFactory(credential, options)
+	if err != nil {
+		return nil, err
+	}
+	return &BlobStorageCostQuerier{query: factory.NewQueryClient()}, nil
+}
+
+// CostQueryClient returns the underlying Cost Management client for subscription-scoped Usage calls.
+func (q *BlobStorageCostQuerier) CostQueryClient() *armcostmanagement.QueryClient {
+	return q.query
+}
+
+// QueryBlobStorage implements blob.StorageCostQuerier.
+func (*BlobStorageCostQuerier) QueryBlobStorage(context.Context, string, time.Duration) ([]blob.StorageCostRow, error) {
+	return nil, nil
+}