refactor: reduce cyclomatic complexity in relations extraction

Break up ExtractRelations, extractVolumes, extractEnvRefs, and
extractIngressBackends into smaller focused functions to pass CI
complexity checks.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pkg/dashboard/objects/relations.go

@@ -28,38 +28,28 @@ type RelationEdge struct {
 	Type   string `json:"type"`
 }
 
+type edgeAdder func(sourceID, targetKind, targetName, edgeType string)
+
+type workloadLabels struct {
+	id     string
+	labels map[string]interface{}
+}
+
 func nodeID(kind, name string) string {
 	return kind + "/" + name
 }
 
+func docKindAndName(doc map[string]interface{}) (string, string) {
+	kind, _ := doc["kind"].(string)
+	metadata, _ := doc["metadata"].(map[string]interface{})
+	name, _ := metadata["name"].(string)
+	return kind, name
+}
+
 // ExtractRelations parses a manifest and returns the resource relation graph.
 func ExtractRelations(manifest string) RelationGraph {
-	dec := yaml.NewYAMLOrJSONDecoder(strings.NewReader(manifest), 4096)
-
-	var docs []map[string]interface{}
-	for {
-		var tmp map[string]interface{}
-		if err := dec.Decode(&tmp); err != nil {
-			break
-		}
-		if tmp == nil {
-			continue
-		}
-		kind, _ := tmp["kind"].(string)
-		if kind == "" {
-			continue
-		}
-		docs = append(docs, tmp)
-	}
-
-	nodes := map[string]RelationNode{}
-	for _, doc := range docs {
-		kind, _ := doc["kind"].(string)
-		metadata, _ := doc["metadata"].(map[string]interface{})
-		name, _ := metadata["name"].(string)
-		id := nodeID(kind, name)
-		nodes[id] = RelationNode{ID: id, Kind: kind, Name: name, InRelease: true}
-	}
+	docs := parseManifestDocs(manifest)
+	nodes := buildNodeSet(docs)
 
 	var edges []RelationEdge
 	addEdge := func(sourceID, targetKind, targetName, edgeType string) {
@@ -73,83 +63,11 @@ func ExtractRelations(manifest string) RelationGraph {
 		edges = append(edges, RelationEdge{Source: sourceID, Target: tid, Type: edgeType})
 	}
 
-	// Build label index for selector matching: workload ID -> template labels
-	type workloadLabels struct {
-		id     string
-		labels map[string]interface{}
-	}
-	var workloads []workloadLabels
+	workloads := buildWorkloadIndex(docs)
 	for _, doc := range docs {
-		kind, _ := doc["kind"].(string)
-		metadata, _ := doc["metadata"].(map[string]interface{})
-		name, _ := metadata["name"].(string)
-		spec, _ := doc["spec"].(map[string]interface{})
-		if spec == nil {
-			continue
-		}
-		tpl, _ := spec["template"].(map[string]interface{})
-		if tpl == nil {
-			continue
-		}
-		tplMeta, _ := tpl["metadata"].(map[string]interface{})
-		if tplMeta == nil {
-			continue
-		}
-		lbls, _ := tplMeta["labels"].(map[string]interface{})
-		if lbls != nil {
-			workloads = append(workloads, workloadLabels{id: nodeID(kind, name), labels: lbls})
-		}
+		extractDocEdges(doc, workloads, addEdge)
 	}
 
-	for _, doc := range docs {
-		kind, _ := doc["kind"].(string)
-		metadata, _ := doc["metadata"].(map[string]interface{})
-		name, _ := metadata["name"].(string)
-		srcID := nodeID(kind, name)
-
-		// ownerReferences
-		extractOwnerRefs(doc, srcID, addEdge)
-
-		// recursive *Ref fields (skip metadata to avoid self-refs from ownerReferences)
-		collectRefFields(doc, srcID, addEdge)
-
-		// volumes, envFrom, serviceAccount from pod specs
-		for _, podSpec := range findPodSpecs(kind, doc) {
-			extractVolumes(podSpec, srcID, addEdge)
-			extractEnvRefs(podSpec, srcID, addEdge)
-			extractServiceAccount(podSpec, srcID, addEdge)
-		}
-
-		// Service selector -> workloads
-		if kind == "Service" {
-			spec, _ := doc["spec"].(map[string]interface{})
-			if spec != nil {
-				selector, _ := spec["selector"].(map[string]interface{})
-				if len(selector) > 0 {
-					for _, wl := range workloads {
-						if labelsMatch(selector, wl.labels) {
-							parts := strings.SplitN(wl.id, "/", 2)
-							if len(parts) == 2 {
-								addEdge(srcID, parts[0], parts[1], "selector")
-							}
-						}
-					}
-				}
-			}
-		}
-
-		// Ingress -> Service
-		if kind == "Ingress" {
-			extractIngressBackends(doc, srcID, addEdge)
-		}
-
-		// RoleBinding / ClusterRoleBinding
-		if kind == "RoleBinding" || kind == "ClusterRoleBinding" {
-			extractRoleBindingRefs(doc, srcID, addEdge)
-		}
-	}
-
-	// Deduplicate edges
 	edges = deduplicateEdges(edges)
 
 	nodeSlice := make([]RelationNode, 0, len(nodes))
@@ -160,7 +78,86 @@ func ExtractRelations(manifest string) RelationGraph {
 	return RelationGraph{Nodes: nodeSlice, Edges: edges}
 }
 
-func extractOwnerRefs(doc map[string]interface{}, srcID string, addEdge func(string, string, string, string)) {
+func parseManifestDocs(manifest string) []map[string]interface{} {
+	dec := yaml.NewYAMLOrJSONDecoder(strings.NewReader(manifest), 4096)
+	var docs []map[string]interface{}
+	for {
+		var tmp map[string]interface{}
+		if err := dec.Decode(&tmp); err != nil {
+			break
+		}
+		kind, _ := tmp["kind"].(string)
+		if kind != "" {
+			docs = append(docs, tmp)
+		}
+	}
+	return docs
+}
+
+func buildNodeSet(docs []map[string]interface{}) map[string]RelationNode {
+	nodes := map[string]RelationNode{}
+	for _, doc := range docs {
+		kind, name := docKindAndName(doc)
+		id := nodeID(kind, name)
+		nodes[id] = RelationNode{ID: id, Kind: kind, Name: name, InRelease: true}
+	}
+	return nodes
+}
+
+func buildWorkloadIndex(docs []map[string]interface{}) []workloadLabels {
+	var workloads []workloadLabels
+	for _, doc := range docs {
+		kind, name := docKindAndName(doc)
+		lbls := getTemplateLabels(doc)
+		if lbls != nil {
+			workloads = append(workloads, workloadLabels{id: nodeID(kind, name), labels: lbls})
+		}
+	}
+	return workloads
+}
+
+func getTemplateLabels(doc map[string]interface{}) map[string]interface{} {
+	spec, _ := doc["spec"].(map[string]interface{})
+	if spec == nil {
+		return nil
+	}
+	tpl, _ := spec["template"].(map[string]interface{})
+	if tpl == nil {
+		return nil
+	}
+	tplMeta, _ := tpl["metadata"].(map[string]interface{})
+	if tplMeta == nil {
+		return nil
+	}
+	lbls, _ := tplMeta["labels"].(map[string]interface{})
+	return lbls
+}
+
+func extractDocEdges(doc map[string]interface{}, workloads []workloadLabels, addEdge edgeAdder) {
+	kind, name := docKindAndName(doc)
+	srcID := nodeID(kind, name)
+
+	extractOwnerRefs(doc, srcID, addEdge)
+	collectRefFields(doc, srcID, addEdge)
+
+	for _, podSpec := range findPodSpecs(kind, doc) {
+		extractVolumes(podSpec, srcID, addEdge)
+		extractEnvRefs(podSpec, srcID, addEdge)
+		extractServiceAccount(podSpec, srcID, addEdge)
+	}
+
+	if kind == "Service" {
+		extractServiceSelector(doc, srcID, workloads, addEdge)
+	}
+	if kind == "Ingress" {
+		extractIngressBackends(doc, srcID, addEdge)
+	}
+	if kind == "RoleBinding" || kind == "ClusterRoleBinding" {
+		extractRoleBindingRefs(doc, srcID, addEdge)
+	}
+}
+
+func extractOwnerRefs(doc map[string]interface{}, srcID string, addEdge edgeAdder) {
 	metadata, _ := doc["metadata"].(map[string]interface{})
 	if metadata == nil {
 		return
@@ -179,8 +176,7 @@ func extractOwnerRefs(doc map[string]interface{}, srcID string, addEdge func(str
 	}
 }
 
-func collectRefFields(doc map[string]interface{}, srcID string, addEdge func(string, string, string, string)) {
-	// Walk the doc but skip metadata (ownerReferences handled separately)
+func collectRefFields(doc map[string]interface{}, srcID string, addEdge edgeAdder) {
 	for key, value := range doc {
 		if key == "metadata" {
 			continue
@@ -189,7 +185,7 @@ func collectRefFields(doc map[string]interface{}, srcID string, addEdge func(str
 	}
 }
 
-func collectRefFieldsRecursive(obj interface{}, srcID string, addEdge func(string, string, string, string)) {
+func collectRefFieldsRecursive(obj interface{}, srcID string, addEdge edgeAdder) {
 	switch v := obj.(type) {
 	case map[string]interface{}:
 		for key, value := range v {
@@ -206,7 +202,7 @@ func collectRefFieldsRecursive(obj interface{}, srcID string, addEdge func(strin
 	}
 }
 
-func tryAddRef(value interface{}, srcID string, addEdge func(string, string, string, string)) {
+func tryAddRef(value interface{}, srcID string, addEdge edgeAdder) {
 	switch v := value.(type) {
 	case map[string]interface{}:
 		kind, _ := v["kind"].(string)
@@ -227,51 +223,59 @@ func tryAddRef(value interface{}, srcID string, addEdge func(string, string, str
 	}
 }
 
-func extractVolumes(podSpec map[string]interface{}, srcID string, addEdge func(string, string, string, string)) {
+func extractVolumes(podSpec map[string]interface{}, srcID string, addEdge edgeAdder) {
 	volumes, _ := podSpec["volumes"].([]interface{})
 	for _, vol := range volumes {
 		v, ok := vol.(map[string]interface{})
 		if !ok {
 			continue
 		}
-		if cm, ok := v["configMap"].(map[string]interface{}); ok {
+		extractVolumeSource(v, srcID, addEdge)
+	}
+}
+
+func extractVolumeSource(v map[string]interface{}, srcID string, addEdge edgeAdder) {
+	if cm, ok := v["configMap"].(map[string]interface{}); ok {
+		if name, _ := cm["name"].(string); name != "" {
+			addEdge(srcID, "ConfigMap", name, "volume")
+		}
+	}
+	if sec, ok := v["secret"].(map[string]interface{}); ok {
+		if name, _ := sec["secretName"].(string); name != "" {
+			addEdge(srcID, "Secret", name, "volume")
+		}
+	}
+	if pvc, ok := v["persistentVolumeClaim"].(map[string]interface{}); ok {
+		if name, _ := pvc["claimName"].(string); name != "" {
+			addEdge(srcID, "PersistentVolumeClaim", name, "volume")
+		}
+	}
+	if proj, ok := v["projected"].(map[string]interface{}); ok {
+		extractProjectedSources(proj, srcID, addEdge)
+	}
+}
+
+func extractProjectedSources(proj map[string]interface{}, srcID string, addEdge edgeAdder) {
+	sources, _ := proj["sources"].([]interface{})
+	for _, s := range sources {
+		src, ok := s.(map[string]interface{})
+		if !ok {
+			continue
+		}
+		if cm, ok := src["configMap"].(map[string]interface{}); ok {
 			if name, _ := cm["name"].(string); name != "" {
 				addEdge(srcID, "ConfigMap", name, "volume")
 			}
 		}
-		if sec, ok := v["secret"].(map[string]interface{}); ok {
-			if name, _ := sec["secretName"].(string); name != "" {
+		if sec, ok := src["secret"].(map[string]interface{}); ok {
+			if name, _ := sec["name"].(string); name != "" {
 				addEdge(srcID, "Secret", name, "volume")
 			}
 		}
-		if pvc, ok := v["persistentVolumeClaim"].(map[string]interface{}); ok {
-			if name, _ := pvc["claimName"].(string); name != "" {
-				addEdge(srcID, "PersistentVolumeClaim", name, "volume")
-			}
-		}
-		if proj, ok := v["projected"].(map[string]interface{}); ok {
-			sources, _ := proj["sources"].([]interface{})
-			for _, s := range sources {
-				src, ok := s.(map[string]interface{})
-				if !ok {
-					continue
-				}
-				if cm, ok := src["configMap"].(map[string]interface{}); ok {
-					if name, _ := cm["name"].(string); name != "" {
-						addEdge(srcID, "ConfigMap", name, "volume")
-					}
-				}
-				if sec, ok := src["secret"].(map[string]interface{}); ok {
-					if name, _ := sec["name"].(string); name != "" {
-						addEdge(srcID, "Secret", name, "volume")
-					}
-				}
-			}
-		}
 	}
 }
 
-func extractEnvRefs(podSpec map[string]interface{}, srcID string, addEdge func(string, string, string, string)) {
+func extractEnvRefs(podSpec map[string]interface{}, srcID string, addEdge edgeAdder) {
 	containers, _ := podSpec["containers"].([]interface{})
 	initContainers, _ := podSpec["initContainers"].([]interface{})
 	allContainers := append(containers, initContainers...)
@@ -281,91 +285,119 @@ func extractEnvRefs(podSpec map[string]interface{}, srcID string, addEdge func(s
 		if !ok {
 			continue
 		}
-		// envFrom
-		envFrom, _ := cMap["envFrom"].([]interface{})
-		for _, ef := range envFrom {
-			e, ok := ef.(map[string]interface{})
-			if !ok {
-				continue
-			}
-			if cmRef, ok := e["configMapRef"].(map[string]interface{}); ok {
-				if name, _ := cmRef["name"].(string); name != "" {
-					addEdge(srcID, "ConfigMap", name, "envRef")
-				}
-			}
-			if secRef, ok := e["secretRef"].(map[string]interface{}); ok {
-				if name, _ := secRef["name"].(string); name != "" {
-					addEdge(srcID, "Secret", name, "envRef")
-				}
+		extractContainerEnvRefs(cMap, srcID, addEdge)
+	}
+}
+
+func extractContainerEnvRefs(cMap map[string]interface{}, srcID string, addEdge edgeAdder) {
+	envFrom, _ := cMap["envFrom"].([]interface{})
+	for _, ef := range envFrom {
+		e, ok := ef.(map[string]interface{})
+		if !ok {
+			continue
+		}
+		if cmRef, ok := e["configMapRef"].(map[string]interface{}); ok {
+			if name, _ := cmRef["name"].(string); name != "" {
+				addEdge(srcID, "ConfigMap", name, "envRef")
 			}
 		}
-		// env[].valueFrom
-		envVars, _ := cMap["env"].([]interface{})
-		for _, ev := range envVars {
-			envVar, ok := ev.(map[string]interface{})
-			if !ok {
-				continue
+		if secRef, ok := e["secretRef"].(map[string]interface{}); ok {
+			if name, _ := secRef["name"].(string); name != "" {
+				addEdge(srcID, "Secret", name, "envRef")
 			}
-			valueFrom, _ := envVar["valueFrom"].(map[string]interface{})
-			if valueFrom == nil {
-				continue
+		}
+	}
+	extractEnvValueFromRefs(cMap, srcID, addEdge)
+}
+
+func extractEnvValueFromRefs(cMap map[string]interface{}, srcID string, addEdge edgeAdder) {
+	envVars, _ := cMap["env"].([]interface{})
+	for _, ev := range envVars {
+		envVar, ok := ev.(map[string]interface{})
+		if !ok {
+			continue
+		}
+		valueFrom, _ := envVar["valueFrom"].(map[string]interface{})
+		if valueFrom == nil {
+			continue
+		}
+		if cmKeyRef, ok := valueFrom["configMapKeyRef"].(map[string]interface{}); ok {
+			if name, _ := cmKeyRef["name"].(string); name != "" {
+				addEdge(srcID, "ConfigMap", name, "envRef")
 			}
-			if cmKeyRef, ok := valueFrom["configMapKeyRef"].(map[string]interface{}); ok {
-				if name, _ := cmKeyRef["name"].(string); name != "" {
-					addEdge(srcID, "ConfigMap", name, "envRef")
-				}
-			}
-			if secKeyRef, ok := valueFrom["secretKeyRef"].(map[string]interface{}); ok {
-				if name, _ := secKeyRef["name"].(string); name != "" {
-					addEdge(srcID, "Secret", name, "envRef")
-				}
+		}
+		if secKeyRef, ok := valueFrom["secretKeyRef"].(map[string]interface{}); ok {
+			if name, _ := secKeyRef["name"].(string); name != "" {
+				addEdge(srcID, "Secret", name, "envRef")
 			}
 		}
 	}
 }
 
-func extractServiceAccount(podSpec map[string]interface{}, srcID string, addEdge func(string, string, string, string)) {
+func extractServiceAccount(podSpec map[string]interface{}, srcID string, addEdge edgeAdder) {
 	if sa, _ := podSpec["serviceAccountName"].(string); sa != "" && sa != "default" {
 		addEdge(srcID, "ServiceAccount", sa, "serviceAccount")
 	}
 }
 
-func extractIngressBackends(doc map[string]interface{}, srcID string, addEdge func(string, string, string, string)) {
+func extractServiceSelector(doc map[string]interface{}, srcID string, workloads []workloadLabels, addEdge edgeAdder) {
+	spec, _ := doc["spec"].(map[string]interface{})
+	if spec == nil {
+		return
+	}
+	selector, _ := spec["selector"].(map[string]interface{})
+	if len(selector) == 0 {
+		return
+	}
+	for _, wl := range workloads {
+		if labelsMatch(selector, wl.labels) {
+			parts := strings.SplitN(wl.id, "/", 2)
+			if len(parts) == 2 {
+				addEdge(srcID, parts[0], parts[1], "selector")
+			}
+		}
+	}
+}
+
+func extractIngressBackends(doc map[string]interface{}, srcID string, addEdge edgeAdder) {
 	spec, _ := doc["spec"].(map[string]interface{})
 	if spec == nil {
 		return
 	}
 
-	// default backend
 	if backend, ok := spec["defaultBackend"].(map[string]interface{}); ok {
 		addIngressServiceRef(backend, srcID, addEdge)
 	}
 
+	extractIngressRules(spec, srcID, addEdge)
+	extractIngressTLS(spec, srcID, addEdge)
+}
+
+func extractIngressRules(spec map[string]interface{}, srcID string, addEdge edgeAdder) {
 	rules, _ := spec["rules"].([]interface{})
 	for _, r := range rules {
 		rule, ok := r.(map[string]interface{})
 		if !ok {
 			continue
 		}
-		http, _ := rule["http"].(map[string]interface{})
-		if http == nil {
+		httpSection, _ := rule["http"].(map[string]interface{})
+		if httpSection == nil {
 			continue
 		}
-		paths, _ := http["paths"].([]interface{})
+		paths, _ := httpSection["paths"].([]interface{})
 		for _, p := range paths {
 			path, ok := p.(map[string]interface{})
 			if !ok {
 				continue
 			}
-			backend, _ := path["backend"].(map[string]interface{})
-			if backend == nil {
-				continue
+			if backend, ok := path["backend"].(map[string]interface{}); ok {
+				addIngressServiceRef(backend, srcID, addEdge)
 			}
-			addIngressServiceRef(backend, srcID, addEdge)
 		}
 	}
+}
 
-	// TLS secrets
+func extractIngressTLS(spec map[string]interface{}, srcID string, addEdge edgeAdder) {
 	tls, _ := spec["tls"].([]interface{})
 	for _, t := range tls {
 		tlsEntry, ok := t.(map[string]interface{})
@@ -378,21 +410,18 @@ func extractIngressBackends(doc map[string]interface{}, srcID string, addEdge fu
 	}
 }
 
-func addIngressServiceRef(backend map[string]interface{}, srcID string, addEdge func(string, string, string, string)) {
-	// v1 Ingress: backend.service.name
+func addIngressServiceRef(backend map[string]interface{}, srcID string, addEdge edgeAdder) {
 	if svc, ok := backend["service"].(map[string]interface{}); ok {
 		if name, _ := svc["name"].(string); name != "" {
 			addEdge(srcID, "Service", name, "ingressBackend")
 		}
 	}
-	// v1beta1 Ingress: backend.serviceName
 	if name, _ := backend["serviceName"].(string); name != "" {
 		addEdge(srcID, "Service", name, "ingressBackend")
 	}
 }
 
-func extractRoleBindingRefs(doc map[string]interface{}, srcID string, addEdge func(string, string, string, string)) {
-	// roleRef
+func extractRoleBindingRefs(doc map[string]interface{}, srcID string, addEdge edgeAdder) {
 	if roleRef, ok := doc["roleRef"].(map[string]interface{}); ok {
 		kind, _ := roleRef["kind"].(string)
 		name, _ := roleRef["name"].(string)
@@ -400,7 +429,6 @@ func extractRoleBindingRefs(doc map[string]interface{}, srcID string, addEdge fu
 			addEdge(srcID, kind, name, "roleBinding")
 		}
 	}
-	// subjects
 	subjects, _ := doc["subjects"].([]interface{})
 	for _, s := range subjects {
 		subj, ok := s.(map[string]interface{})