source/custom: use internal api for config parsing

Change the custom feature source of nfd-worker to use the newly added
internal config API for its own configuration. It now uses the internal
types for json/yaml unmarshalling but converts them to external
nfdv1alpha1 API to do the actual rule matching as the internal API does
not duplicate that functionality.

source/custom/custom.go

@@ -18,22 +18,21 @@ package custom
 
 import (
 	"fmt"
+	"os"
 
 	"k8s.io/klog/v2"
 
 	nfdv1alpha1 "sigs.k8s.io/node-feature-discovery/pkg/apis/nfd/v1alpha1"
 	"sigs.k8s.io/node-feature-discovery/pkg/utils"
 	"sigs.k8s.io/node-feature-discovery/source"
+	api "sigs.k8s.io/node-feature-discovery/source/custom/api"
 )
 
 // Name of this feature source
 const Name = "custom"
 
-type CustomRule struct {
-	nfdv1alpha1.Rule
-}
-
-type config []CustomRule
+// The config files use the internal API type.
+type config []api.Rule
 
 // newDefaultConfig returns a new config with pre-populated defaults
 func newDefaultConfig() *config {
@@ -43,13 +42,19 @@ func newDefaultConfig() *config {
 // customSource implements the LabelSource and ConfigurableSource interfaces.
 type customSource struct {
 	config *config
+	// The rules are stored in the NFD API format that is a superset of our
+	// internal API and provides the functions for rule matching.
+	rules []nfdv1alpha1.Rule
 }
 
 // Singleton source instance
 var (
-	src                           = customSource{config: newDefaultConfig()}
-	_   source.LabelSource        = &src
-	_   source.ConfigurableSource = &src
+	src = customSource{
+		config: &config{},
+		rules:  []nfdv1alpha1.Rule{},
+	}
+	_ source.LabelSource        = &src
+	_ source.ConfigurableSource = &src
 )
 
 // Name returns the name of the feature source
@@ -65,6 +70,8 @@ func (s *customSource) GetConfig() source.Config { return s.config }
 func (s *customSource) SetConfig(conf source.Config) {
 	switch v := conf.(type) {
 	case *config:
+		r := []api.Rule(*v)
+		s.rules = convertInternalRulesToNfdApi(&r)
 		s.config = v
 	default:
 		panic(fmt.Sprintf("invalid config type: %T", conf))
@@ -80,8 +87,8 @@ func (s *customSource) GetLabels() (source.FeatureLabels, error) {
 	features := source.GetAllFeatures()
 
 	labels := source.FeatureLabels{}
-	allFeatureConfig := append(getStaticFeatureConfig(), *s.config...)
-	allFeatureConfig = append(allFeatureConfig, getDirectoryFeatureConfig()...)
+	allFeatureConfig := append(getStaticRules(), s.rules...)
+	allFeatureConfig = append(allFeatureConfig, getDropinDirRules()...)
 	klog.V(2).InfoS("resolving custom features", "configuration", utils.DelayedDumper(allFeatureConfig))
 	// Iterate over features
 	for _, rule := range allFeatureConfig {
@@ -102,6 +109,17 @@ func (s *customSource) GetLabels() (source.FeatureLabels, error) {
 	return labels, nil
 }
 
+func convertInternalRulesToNfdApi(in *[]api.Rule) []nfdv1alpha1.Rule {
+	out := make([]nfdv1alpha1.Rule, len(*in))
+	for i := range *in {
+		if err := api.ConvertRuleToV1alpha1(&(*in)[i], &out[i]); err != nil {
+			klog.ErrorS(err, "FATAL: API conversion failed")
+			os.Exit(255)
+		}
+	}
+	return out
+}
+
 func init() {
 	source.Register(&src)
 }

source/custom/directory_features.go

@@ -22,22 +22,24 @@ import (
 	"strings"
 
 	"k8s.io/klog/v2"
+	nfdv1alpha1 "sigs.k8s.io/node-feature-discovery/pkg/apis/nfd/v1alpha1"
+	api "sigs.k8s.io/node-feature-discovery/source/custom/api"
 	"sigs.k8s.io/yaml"
 )
 
 // Directory stores the full path for the custom sources folder
 const Directory = "/etc/kubernetes/node-feature-discovery/custom.d"
 
-// getDirectoryFeatureConfig returns features configured in the "/etc/kubernetes/node-feature-discovery/custom.d"
+// getDropinDirRules returns features configured in the "/etc/kubernetes/node-feature-discovery/custom.d"
 // host directory and its 1st level subdirectories, which can be populated e.g. by ConfigMaps
-func getDirectoryFeatureConfig() []CustomRule {
+func getDropinDirRules() []nfdv1alpha1.Rule {
 	features := readDir(Directory, true)
 	klog.V(3).InfoS("all custom feature specs from config dir", "featureSpecs", features)
 	return features
 }
 
-func readDir(dirName string, recursive bool) []CustomRule {
-	features := make([]CustomRule, 0)
+func readDir(dirName string, recursive bool) []nfdv1alpha1.Rule {
+	features := make([]nfdv1alpha1.Rule, 0)
 
 	klog.V(4).InfoS("reading directory", "path", dirName)
 	files, err := os.ReadDir(dirName)
@@ -74,14 +76,14 @@ func readDir(dirName string, recursive bool) []CustomRule {
 			continue
 		}
 
-		config := &[]CustomRule{}
+		config := &[]api.Rule{}
 		err = yaml.UnmarshalStrict(bytes, config)
 		if err != nil {
 			klog.ErrorS(err, "could not parse file", "path", fileName)
 			continue
 		}
 
-		features = append(features, *config...)
+		features = append(features, convertInternalRulesToNfdApi(config)...)
 	}
 	return features
 }

source/custom/static_features.go

@@ -20,40 +20,36 @@ import (
 	nfdv1alpha1 "sigs.k8s.io/node-feature-discovery/pkg/apis/nfd/v1alpha1"
 )
 
-// getStaticFeatures returns statically configured custom features to discover
+// getStaticRules returns statically configured custom features to discover
 // e.g RMDA related features. NFD configuration file may extend these custom features by adding rules.
-func getStaticFeatureConfig() []CustomRule {
-	return []CustomRule{
-		{
-			nfdv1alpha1.Rule{
-				Name:   "RDMA capable static rule",
-				Labels: map[string]string{"rdma.capable": "true"},
-				MatchFeatures: nfdv1alpha1.FeatureMatcher{
-					nfdv1alpha1.FeatureMatcherTerm{
-						Feature: "pci.device",
-						MatchExpressions: &nfdv1alpha1.MatchExpressionSet{
-							"vendor": &nfdv1alpha1.MatchExpression{
-								Op:    nfdv1alpha1.MatchIn,
-								Value: nfdv1alpha1.MatchValue{"15b3"}},
-						},
+func getStaticRules() []nfdv1alpha1.Rule {
+	return []nfdv1alpha1.Rule{
+		nfdv1alpha1.Rule{
+			Name:   "RDMA capable static rule",
+			Labels: map[string]string{"rdma.capable": "true"},
+			MatchFeatures: nfdv1alpha1.FeatureMatcher{
+				nfdv1alpha1.FeatureMatcherTerm{
+					Feature: "pci.device",
+					MatchExpressions: &nfdv1alpha1.MatchExpressionSet{
+						"vendor": &nfdv1alpha1.MatchExpression{
+							Op:    nfdv1alpha1.MatchIn,
+							Value: nfdv1alpha1.MatchValue{"15b3"}},
 					},
 				},
 			},
 		},
-		{
-			nfdv1alpha1.Rule{
-				Name:   "RDMA available static rule",
-				Labels: map[string]string{"rdma.available": "true"},
-				MatchFeatures: nfdv1alpha1.FeatureMatcher{
-					nfdv1alpha1.FeatureMatcherTerm{
-						Feature: "kernel.loadedmodule",
-						MatchExpressions: &nfdv1alpha1.MatchExpressionSet{
-							"ib_uverbs": &nfdv1alpha1.MatchExpression{
-								Op: nfdv1alpha1.MatchExists,
-							},
-							"rdma_ucm": &nfdv1alpha1.MatchExpression{
-								Op: nfdv1alpha1.MatchExists,
-							},
+		nfdv1alpha1.Rule{
+			Name:   "RDMA available static rule",
+			Labels: map[string]string{"rdma.available": "true"},
+			MatchFeatures: nfdv1alpha1.FeatureMatcher{
+				nfdv1alpha1.FeatureMatcherTerm{
+					Feature: "kernel.loadedmodule",
+					MatchExpressions: &nfdv1alpha1.MatchExpressionSet{
+						"ib_uverbs": &nfdv1alpha1.MatchExpression{
+							Op: nfdv1alpha1.MatchExists,
+						},
+						"rdma_ucm": &nfdv1alpha1.MatchExpression{
+							Op: nfdv1alpha1.MatchExists,
 						},
 					},
 				},