performancecounter: fix panic with counter names having brackets (#1822)

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

internal/collector/performancecounter/performancecounter.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"log/slog"
 	"reflect"
+	"regexp"
 	"slices"
 	"strings"
 	"time"
@@ -34,6 +35,8 @@ import (
 
 const Name = "performancecounter"
 
+var reNonAlphaNum = regexp.MustCompile(`[^a-zA-Z0-9]`)
+
 type Config struct {
 	Objects []Object `yaml:"objects"`
 }
@@ -51,8 +54,6 @@ type Collector struct {
 
 	objects []Object
 
-	metricNameReplacer *strings.Replacer
-
 	// meta
 	subCollectorScrapeDurationDesc *prometheus.Desc
 	subCollectorScrapeSuccessDesc  *prometheus.Desc
@@ -115,15 +116,6 @@ func (c *Collector) Close() error {
 
 func (c *Collector) Build(logger *slog.Logger, _ *mi.Session) error {
 	c.logger = logger.With(slog.String("collector", Name))
-
-	c.metricNameReplacer = strings.NewReplacer(
-		".", "",
-		"%", "",
-		"/", "_",
-		" ", "_",
-		"-", "_",
-	)
-
 	c.objects = make([]Object, 0, len(c.config.Objects))
 	names := make([]string, 0, len(c.config.Objects))
 
@@ -152,7 +144,7 @@ func (c *Collector) Build(logger *slog.Logger, _ *mi.Session) error {
 
 		for j, counter := range object.Counters {
 			if counter.Metric == "" {
-				c.config.Objects[i].Counters[j].Metric = c.sanitizeMetricName(
+				c.config.Objects[i].Counters[j].Metric = sanitizeMetricName(
 					fmt.Sprintf("%s_%s_%s_%s", types.Namespace, Name, object.Object, counter.Name),
 				)
 			}
@@ -171,11 +163,27 @@ func (c *Collector) Build(logger *slog.Logger, _ *mi.Session) error {
 			}
 
 			counters = append(counters, counter.Name)
-			fields = append(fields, reflect.StructField{
-				Name: strings.ToUpper(c.sanitizeMetricName(counter.Name)),
-				Type: reflect.TypeOf(float64(0)),
-				Tag:  reflect.StructTag(fmt.Sprintf(`perfdata:"%s"`, counter.Name)),
-			})
+
+			field, err := func(name string) (_ reflect.StructField, err error) {
+				defer func() {
+					if r := recover(); r != nil {
+						err = fmt.Errorf("failed to create field for %s: %v", name, r)
+					}
+				}()
+
+				return reflect.StructField{
+					Name: strings.ToUpper(sanitizeMetricName(name)),
+					Type: reflect.TypeOf(float64(0)),
+					Tag:  reflect.StructTag(fmt.Sprintf(`perfdata:"%s"`, name)),
+				}, nil
+			}(counter.Name)
+			if err != nil {
+				errs = append(errs, err)
+
+				continue
+			}
+
+			fields = append(fields, field)
 		}
 
 		if object.Instances != nil {
@@ -276,7 +284,7 @@ func (c *Collector) collectObject(ch chan<- prometheus.Metric, perfDataObject Ob
 		for _, counter := range perfDataObject.Counters {
 			val := reflect.ValueOf(sliceValue).Index(i)
 
-			field := val.FieldByName(strings.ToUpper(c.sanitizeMetricName(counter.Name)))
+			field := val.FieldByName(strings.ToUpper(sanitizeMetricName(counter.Name)))
 			if !field.IsValid() {
 				errs = append(errs, fmt.Errorf("%s not found in collected data", counter.Name))
 
@@ -355,6 +363,6 @@ func (c *Collector) collectObject(ch chan<- prometheus.Metric, perfDataObject Ob
 	return errors.Join(errs...)
 }
 
-func (c *Collector) sanitizeMetricName(name string) string {
-	return strings.Trim(c.metricNameReplacer.Replace(strings.ToLower(name)), "_")
+func sanitizeMetricName(name string) string {
+	return strings.Trim(reNonAlphaNum.ReplaceAllString(strings.ToLower(name), "_"), "_")
 }

internal/collector/performancecounter/performancecounter_test_test.go

@@ -25,6 +25,7 @@ import (
 	"testing"
 
 	"github.com/prometheus-community/windows_exporter/internal/collector/performancecounter"
+	"github.com/prometheus-community/windows_exporter/internal/pdh"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/stretchr/testify/assert"
@@ -126,6 +127,14 @@ windows_performancecounter_processor_information_processor_time\{core="0,0",stat
 			counters:        []performancecounter.Counter{{Name: "Available Bytes", Type: "gauge"}, {Name: "Available Bytes", Type: "gauge"}},
 			expectedMetrics: nil,
 		},
+		{
+			name:            "counter with spaces and brackets",
+			object:          "invalid",
+			instances:       nil,
+			buildErr:        pdh.NewPdhError(pdh.CstatusNoObject).Error(),
+			counters:        []performancecounter.Counter{{Name: "Total Memory Usage --- Non-Paged Pool", Type: "counter"}, {Name: "Max Session Input Delay (ms)", Type: "counter"}},
+			expectedMetrics: nil,
+		},
 	} {
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()

internal/collector/vmware/vmware.go

@@ -93,11 +93,19 @@ func (c *Collector) Close() error {
 }
 
 func (c *Collector) Build(_ *slog.Logger, _ *mi.Session) error {
-	var err error
+	var (
+		err  error
+		errs []error
+	)
 
 	c.perfDataCollectorCPU, err = pdh.NewCollector[perfDataCounterValuesCPU]("VM Processor", pdh.InstancesTotal)
 	if err != nil {
-		return fmt.Errorf("failed to create VM Processor collector: %w", err)
+		errs = append(errs, fmt.Errorf("failed to create VM Processor collector: %w", err))
+	}
+
+	c.perfDataCollectorMemory, err = pdh.NewCollector[perfDataCounterValuesMemory]("VM Memory", nil)
+	if err != nil {
+		errs = append(errs, fmt.Errorf("failed to create VM Memory collector: %w", err))
 	}
 
 	c.cpuLimitMHz = prometheus.NewDesc(
@@ -143,11 +151,6 @@ func (c *Collector) Build(_ *slog.Logger, _ *mi.Session) error {
 		nil,
 	)
 
-	c.perfDataCollectorMemory, err = pdh.NewCollector[perfDataCounterValuesMemory]("VM Memory", nil)
-	if err != nil {
-		return fmt.Errorf("failed to create VM Memory collector: %w", err)
-	}
-
 	c.memActive = prometheus.NewDesc(
 		prometheus.BuildFQName(types.Namespace, Name, "mem_active_bytes"),
 		"The estimated amount of memory the virtual machine is actively using.",
@@ -221,7 +224,7 @@ func (c *Collector) Build(_ *slog.Logger, _ *mi.Session) error {
 		nil,
 	)
 
-	return nil
+	return errors.Join(errs...)
 }
 
 // Collect sends the metric values for each metric