add storage_account label

README.md

@@ -15,16 +15,16 @@ The goal is to expose stats about storage/disk usage (not transactions) per Azur
 ## Example metrics output
 
 ```text
-# HELP pdok_storage_lastRunDateMetric 
-# TYPE pdok_storage_lastRunDateMetric gauge
-pdok_storage_lastRunDateMetric 1.716122623e+09
+# HELP azure_storage_last_run_date
+# TYPE azure_storage_last_run_date gauge
+azure_storage_last_run_date 1.716122623e+09
 # HELP pdok_storage_usage 
 # TYPE pdok_storage_usage gauge
-pdok_storage_usage{container="blob-inventory",dataset="other",deleted="false",owner="other"} 1.4511800263e+10
-pdok_storage_usage{container="blob-inventory",dataset="other",deleted="true",owner="other"} 1.4697209865e+10
-pdok_storage_usage{container="deliveries",dataset="something",deleted="false",owner="someone"} 1.4624738e+07
-pdok_storage_usage{container="deliveries",dataset="something",deleted="true",owner="someone"} 2.0263731e+07
-pdok_storage_usage{container="deliveries",dataset="somethingelse",deleted="false",owner="someoneelse"} 1.8042443e+07
+azure_storage_usage{container="blob-inventory",dataset="other",deleted="false",owner="other",storage_account="devstoreaccount1"} 1.4511800263e+10
+azure_storage_usage{container="blob-inventory",dataset="other",deleted="true",owner="other",storage_account="devstoreaccount1"} 1.4697209865e+10
+azure_storage_usage{container="deliveries",dataset="something",deleted="false",owner="someone",storage_account="devstoreaccount1"} 1.4624738e+07
+azure_storage_usage{container="deliveries",dataset="something",deleted="true",owner="someone",storage_account="devstoreaccount1"} 2.0263731e+07
+azure_storage_usage{container="deliveries",dataset="somethingelse",deleted="false",owner="someoneelse",storage_account="devstoreaccount1"} 1.8042443e+07
 # .....
 ```
 

cmd/main_test.go

@@ -14,7 +14,7 @@ import (
 func TestPerf(t *testing.T) {
 	t.Skip("local")
 	t.Run("perf", func(t *testing.T) {
-		configFile, err := os.ReadFile("example/pdok-config.yaml")
+		configFile, err := os.ReadFile("example/config.yaml")
 		require.Nil(t, err)
 		config := new(Config)
 		err = yaml.Unmarshal(configFile, config)

example/docker-compose.yaml

@@ -64,6 +64,10 @@ services:
       - -c
       - |
         set -e
-        echo "waiting a bit before checking the metrics (TODO think of something better)"
+        echo "waiting a bit before checking the metrics"
         sleep 7
-        wget -O - 'http://azure-storage-usage-exporter:8080/metrics' | grep 'pdok_storage_usage{deleted="false",tenant="ZDI2",type="ZTJmNTY2MTU2Y2"} 3.4038013e+07'
+        if ! wget -q -O - 'http://azure-storage-usage-exporter:8080/metrics' | grep 'azure_storage_usage{deleted="false",storage_account="devstoreaccount1",tenant="ZDI2",type="ZTJmNTY2MTU2Y2"} 3.4038013e+07' > /dev/null; then
+          echo "expected metric not found"
+        else
+          echo "done"
+        fi

internal/agg/aggregator.go

@@ -15,7 +15,8 @@ import (
 )
 
 const (
-	Deleted = "deleted"
+	Deleted        = "deleted"
+	StorageAccount = "storage_account"
 )
 
 type Labels = map[string]string
@@ -43,13 +44,23 @@ type Aggregator struct {
 	rules              []AggregationRule
 }
 
-func NewAggregator(duReader du.Reader, labels Labels, rules []AggregationRule) (*Aggregator, error) {
-	if _, exists := labels[Deleted]; exists {
-		return nil, errors.New("cannot use deleted as a label")
+func NewAggregator(duReader du.Reader, labelsWithDefaults Labels, rules []AggregationRule) (*Aggregator, error) {
+	if _, exists := labelsWithDefaults[Deleted]; exists {
+		return nil, errors.New("cannot use custom label: " + Deleted)
+	}
+	if labelsWithDefaults == nil {
+		labelsWithDefaults = Labels{}
+	} else {
+		labelsWithDefaults = maps.Clone(labelsWithDefaults)
+	}
+	if given, exists := labelsWithDefaults[StorageAccount]; !exists {
+		labelsWithDefaults[StorageAccount] = duReader.GetStorageAccountName()
+	} else if given == "" {
+		delete(labelsWithDefaults, StorageAccount)
 	}
 	return &Aggregator{
 		duReader:           duReader,
-		labelsWithDefaults: labels,
+		labelsWithDefaults: labelsWithDefaults,
 		rules:              rules,
 	}, nil
 }
@@ -145,8 +156,9 @@ func (a *Aggregator) applyRulesToAggregate(row du.Row) AggregationGroup {
 		aggregationGroup.Deleted = nilBoolToBool(row.Deleted)
 		return aggregationGroup
 	}
+	// default if no rule matches
 	return AggregationGroup{
-		Labels:  a.labelsWithDefaults,
+		Labels:  maps.Clone(a.labelsWithDefaults),
 		Deleted: nilBoolToBool(row.Deleted),
 	}
 }

internal/agg/aggregator_test.go

@@ -52,10 +52,10 @@ func TestAggregator_Aggregate(t *testing.T) {
 			previousRunDate: someFixedTime.Add(-24 * time.Hour),
 		},
 		wantAggregationResults: []AggregationResult{
-			{AggregationGroup: AggregationGroup{Labels: Labels{"level1": "default1", "level2": "default2"}, Deleted: false}, StorageUsage: 666},
-			{AggregationGroup: AggregationGroup{Labels: Labels{"level1": "special", "level2": "sauce"}, Deleted: false}, StorageUsage: 321},
-			{AggregationGroup: AggregationGroup{Labels: Labels{"level1": "dir1", "level2": "dir2"}, Deleted: true}, StorageUsage: 200},
-			{AggregationGroup: AggregationGroup{Labels: Labels{"level1": "dir1", "level2": "dir2"}, Deleted: false}, StorageUsage: 100},
+			{AggregationGroup: AggregationGroup{Labels: Labels{"level1": "default1", "level2": "default2", StorageAccount: "faker"}, Deleted: false}, StorageUsage: 666},
+			{AggregationGroup: AggregationGroup{Labels: Labels{"level1": "special", "level2": "sauce", StorageAccount: "faker"}, Deleted: false}, StorageUsage: 321},
+			{AggregationGroup: AggregationGroup{Labels: Labels{"level1": "dir1", "level2": "dir2", StorageAccount: "faker"}, Deleted: true}, StorageUsage: 200},
+			{AggregationGroup: AggregationGroup{Labels: Labels{"level1": "dir1", "level2": "dir2", StorageAccount: "faker"}, Deleted: false}, StorageUsage: 100},
 		},
 		wantRunDate: someFixedTime,
 		wantErr:     false,
@@ -138,6 +138,10 @@ func (f *fakeDuReader) TestConnection() error {
 	return nil
 }
 
+func (f *fakeDuReader) GetStorageAccountName() string {
+	return "faker"
+}
+
 func boolPtr(b bool) *bool {
 	return &b
 }

internal/du/azure_blob_inventory.go

@@ -5,6 +5,8 @@ import (
 	"errors"
 	"fmt"
 	"log"
+	"net/url"
+	"regexp"
 	"slices"
 	"strings"
 	"time"
@@ -70,6 +72,22 @@ func (ar *AzureBlobInventoryReportDuReader) TestConnection() error {
 	return err
 }
 
+func (ar *AzureBlobInventoryReportDuReader) GetStorageAccountName() string {
+	// github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/internal/shared/ParseConnectionString is unfortunately internal
+	if match := regexp.MustCompile(`AccountName=([^;]+)`).FindStringSubmatch(ar.config.AzureStorageConnectionString); len(match) == 2 {
+		return match[1]
+	}
+	if match := regexp.MustCompile(`BlobEndpoint=([^;]+)`).FindStringSubmatch(ar.config.AzureStorageConnectionString); len(match) == 2 {
+		if blobEndpoint, err := url.Parse(match[1]); blobEndpoint != nil && err != nil {
+			if blobEndpoint.Path != "" {
+				return blobEndpoint.Path
+			}
+			return regexp.MustCompile(`^[^.]+`).FindString(blobEndpoint.Host)
+		}
+	}
+	return "_unknown"
+}
+
 func (ar *AzureBlobInventoryReportDuReader) Read(previousRunDate time.Time) (time.Time, <-chan Row, <-chan error, error) {
 	log.Print("finding newest inventory run")
 	rulesRanByDate, err := ar.findRuns()

internal/du/reader.go

@@ -21,4 +21,5 @@ type Row struct {
 type Reader interface {
 	Read(previousRunDate time.Time) (runDate time.Time, rows <-chan Row, errs <-chan error, err error)
 	TestConnection() error
+	GetStorageAccountName() string
 }

internal/metrics/metrics_updater.go

@@ -21,7 +21,7 @@ type Updater struct {
 }
 
 type Config struct {
-	MetricNamespace string `yaml:"metricNamespace" default:"pdok"`
+	MetricNamespace string `yaml:"metricNamespace" default:"azure"`
 	MetricSubsystem string `yaml:"metricSubsystem" default:"storage"`
 	Limit           int    `yaml:"limit" default:"1000"`
 }
@@ -53,7 +53,7 @@ func NewUpdater(aggregator *agg.Aggregator, config Config) *Updater {
 		lastRunDateMetric: promauto.NewGauge(prometheus.GaugeOpts{
 			Namespace: config.MetricNamespace,
 			Subsystem: config.MetricSubsystem,
-			Name:      "lastRunDateMetric",
+			Name:      "last_run_date",
 		}),
 	}
 }