feat(metrics): add additional labels to metrics

feat(metrics): change additionalLabelsArray to array and use regex to extract labels

feat(metrics): add unit tests for BuildAdditionalLabelsValues function

feat(metrics): add err return value check.

pkg/exporter/cmd/config.go

@@ -16,7 +16,8 @@ type InspServerConfig struct {
 }
 
 type MetricsConfig struct {
-	Probes []ProbeConfig `yaml:"probes" mapstructure:"probes" json:"probes"`
+	Probes           []ProbeConfig `yaml:"probes" mapstructure:"probes" json:"probes"`
+	AdditionalLabels []string      `yaml:"additionalLabels" mapstructure:"additionalLabels" json:"additionalLabels"`
 }
 
 type EventConfig struct {

pkg/exporter/cmd/server.go

@@ -289,6 +289,12 @@ func (i *inspServer) start(cfg *InspServerConfig) error {
 		var err error
 		ctx := context.TODO()
 
+		err = probe.InitAdditionalLabels(cfg.MetricsConfig.AdditionalLabels)
+		if err != nil {
+			log.Errorf("failed init additional labels: %v", err)
+			return
+		}
+
 		log.Infof("start metrics server")
 		i.metricsServer, err = NewMetricsServer()
 		if err != nil {

pkg/exporter/nettop/cache.go

@@ -163,6 +163,7 @@ type Entity struct {
 	podMeta
 	initPid int
 	pids    []int
+	labels  map[string]string
 }
 
 func (e *Entity) String() string {
@@ -177,6 +178,10 @@ func (e *Entity) GetPodNamespace() string {
 	return e.podMeta.namespace
 }
 
+func (e *Entity) GetLabels() map[string]string {
+	return e.labels
+}
+
 func (e *Entity) IsHostNetwork() bool {
 	return e.netnsMeta.isHostNetwork
 }
@@ -353,6 +358,7 @@ func cacheNetTopology(ctx context.Context) error {
 
 		namespace := sandbox.Metadata.Namespace
 		name := sandbox.Metadata.Name
+		labels := sandbox.Labels
 
 		sandboxStatus, err := criClient.PodSandboxStatus(sandbox.Id, true)
 		if err != nil {
@@ -411,6 +417,7 @@ func cacheNetTopology(ctx context.Context) error {
 				namespace: namespace,
 			},
 			initPid: info.Pid,
+			labels:  labels,
 			pids:    pids,
 		}
 

pkg/exporter/probe/legacy.go

@@ -2,6 +2,8 @@ package probe
 
 import (
 	"fmt"
+	"regexp"
+	"strings"
 
 	"github.com/alibaba/kubeskoop/pkg/exporter/bpfutil"
 	"github.com/alibaba/kubeskoop/pkg/exporter/nettop"
@@ -12,9 +14,63 @@ import (
 var legacyMetricsLabels = []string{"target_node", "target_namespace", "target_pod", "node", "namespace", "pod"}
 var StandardMetricsLabels = []string{"k8s_node", "k8s_namespace", "k8s_pod"}
 var TupleMetricsLabels = []string{"protocol", "src", "src_type", "src_node", "src_namespace", "src_pod", "dst", "dst_type", "dst_node", "dst_namespace", "dst_pod", "sport", "dport"}
+var AdditionalLabelValueExpr []string
 
 func BuildStandardMetricsLabelValues(entity *nettop.Entity) []string {
-	return []string{nettop.GetNodeName(), entity.GetPodNamespace(), entity.GetPodName()}
+	metaPodLabels := []string{nettop.GetNodeName(), entity.GetPodNamespace(), entity.GetPodName()}
+	return append(metaPodLabels, BuildAdditionalLabelsValues(entity.GetLabels())...)
+}
+
+func InitAdditionalLabels(additionalLabels []string) error {
+	if len(additionalLabels) == 0 {
+		return nil
+	}
+
+	//append to StandardMetricsLabels and AdditionalLabelValueExpr
+	for additionalKV := range additionalLabels {
+		labelKVPair := strings.Split(additionalLabels[additionalKV], "=")
+		StandardMetricsLabels = append(StandardMetricsLabels, strings.TrimSpace(labelKVPair[0]))
+		AdditionalLabelValueExpr = append(AdditionalLabelValueExpr, strings.TrimSpace(labelKVPair[1]))
+	}
+
+	return nil
+}
+
+func BuildAdditionalLabelsValues(podLabels map[string]string) []string {
+	if len(AdditionalLabelValueExpr) == 0 {
+		return []string{}
+	}
+
+	var values []string
+
+	var replaceAllStringSubmatchFunc = func(re *regexp.Regexp, str string, repl func([]string) string) string {
+		result := ""
+		lastIndex := 0
+
+		for _, v := range re.FindAllSubmatchIndex([]byte(str), -1) {
+			groups := []string{}
+			for i := 0; i < len(v); i += 2 {
+				groups = append(groups, str[v[i]:v[i+1]])
+			}
+
+			result += str[lastIndex:v[0]] + repl(groups)
+			lastIndex = v[1]
+		}
+
+		return result + str[lastIndex:]
+	}
+
+	for _, labelValueExpr := range AdditionalLabelValueExpr {
+		podLabelValue := replaceAllStringSubmatchFunc(regexp.MustCompile(`\${labels:(.*?)}`), labelValueExpr, func(groups []string) string {
+			if podLabelValue, ok := podLabels[groups[1]]; ok {
+				return podLabelValue
+			}
+			return ""
+		})
+		values = append(values, podLabelValue)
+	}
+
+	return values
 }
 
 type legacyBatchMetrics struct {
@@ -89,11 +145,12 @@ func (l *legacyBatchMetrics) Collect(metrics chan<- prometheus.Metric) {
 			if err != nil || et == nil {
 				continue
 			}
-			labelValues := []string{nettop.GetNodeName(), et.GetPodNamespace(), et.GetPodName()}
+			labelValues := BuildStandardMetricsLabelValues(et)
 			// for legacy pod labels
 			emit(newMetricsName(l.module, key), labelValues, float64(value))
 
-			labelValues = append(labelValues, labelValues...)
+			var metaPodData = []string{nettop.GetNodeName(), et.GetPodNamespace(), et.GetPodName()}
+			labelValues = append(metaPodData, metaPodData...)
 			emit(legacyMetricsName(l.module, key, l.underscore), labelValues, float64(value))
 		}
 	}

pkg/exporter/probe/legacy_test.go

@@ -0,0 +1,38 @@
+package probe
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestBuildAdditionalLabelsValues1(t *testing.T) {
+	type args struct {
+		podLabels        map[string]string
+		additionalLabels []string
+	}
+	tests := []struct {
+		name string
+		args args
+		want []string
+	}{
+		{"common", args{map[string]string{"l1": "v1", "l2": "v2"}, []string{"n1=alv1", "n2=alv2"}}, []string{"alv1", "alv2"}},
+		{"match", args{map[string]string{"l1": "v1", "l2": "v2"}, []string{"n1=${labels:l1}", "n2=alv2"}}, []string{"v1", "alv2"}},
+		{"submatch", args{map[string]string{"l1": "v1", "l2": "v2"}, []string{"n1=prefix_${labels:l1}_${labels:l2}_suffix"}}, []string{"prefix_v1_v2_suffix"}},
+		{"nomatch", args{map[string]string{"l1": "v1", "l2": "v2"}, []string{"n1=${labels:ln}"}}, []string{""}},
+		{"empty", args{map[string]string{"l1": "v1", "l2": "v2"}, []string{}}, []string{}},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			AdditionalLabelValueExpr = []string{}
+			err := InitAdditionalLabels(tt.args.additionalLabels)
+			if err != nil {
+				t.Error(err)
+				return
+			}
+
+			if got := BuildAdditionalLabelsValues(tt.args.podLabels); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("BuildAdditionalLabelsValues() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}