Enhancements for node.Field formatting

- Complex values are now marshalled as json
- Booleans are now represented as truth values

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/pkg/node/fields.go

@@ -1,8 +1,8 @@
 package node
 
 import (
+	"encoding/json"
 	"fmt"
-	"net"
 	"reflect"
 	"regexp"
 	"sort"
@@ -223,33 +223,51 @@ func listReflectedFields(t reflect.Type, v reflect.Value, prefix string) (fields
 	return
 }
 
-// valueStr converts a reflect.Value into a string. For slices, it joins all elements into a comma-separated
-// string. For pointers, it returns an empty string if the pointer is nil. For other kinds, it returns the
-// formatted string representation of the value.
+// valueStr converts a reflect.Value into a string.
 func valueStr(value reflect.Value) (output string) {
 	if !value.IsValid() {
 		return ""
 	}
+
 	if value.Kind() == reflect.Pointer {
 		if value.IsZero() {
 			return ""
 		}
 		value = value.Elem()
 	}
-	if value.Type() == reflect.TypeOf(net.IP{}) {
-		if !value.IsZero() {
-			output = fmt.Sprintf("%s", value)
+
+	switch value.Kind() {
+	case reflect.Ptr, reflect.Interface, reflect.Map, reflect.Slice:
+		if value.IsNil() {
+			return ""
 		}
-	} else if value.Kind() == reflect.Slice {
+	}
+
+	stringerType := reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
+	if value.Type().Implements(stringerType) {
+		return fmt.Sprintf("%s", value)
+	}
+
+	if value.Type() == reflect.TypeOf([]string{}) {
 		var sliceStrs []string
 		for i := 0; i < value.Len(); i++ {
 			sliceStrs = append(sliceStrs, fmt.Sprintf("%v", value.Index(i)))
 		}
-		output = strings.Join(sliceStrs, ",")
-	} else {
-		output = fmt.Sprintf("%s", value)
+		return strings.Join(sliceStrs, ",")
 	}
-	return output
+
+	switch value.Kind() {
+	case reflect.String, reflect.Int:
+		return fmt.Sprintf("%s", value)
+	case reflect.Bool:
+		return fmt.Sprintf("%t", value.Bool())
+	}
+
+	if jsonBytes, err := json.Marshal(value.Interface()); err == nil {
+		return string(jsonBytes)
+	}
+
+	return fmt.Sprintf("%s", value)
 }
 
 // sortValues sorts a slice of reflect.Values. Currently, it only supports sorting string values and

internal/pkg/node/fields_test.go

@@ -14,6 +14,7 @@ func Test_getNestedFieldString(t *testing.T) {
 		node      string
 		field     string
 		value     string
+		jsonValue string
 	}{
 		"comment (simple)": {
 			nodesConf: `
@@ -67,6 +68,53 @@ nodes:
 			field: "NetDevs[default].Tags[tag]",
 			value: "n1 netdev tag",
 		},
+		"boolean value (true)": {
+			nodesConf: `
+nodes:
+  n1:
+    discoverable: true`,
+			node:  "n1",
+			field: "Discoverable",
+			value: "true",
+		},
+		"boolean value (false)": {
+			nodesConf: `
+nodes:
+  n1:
+    discoverable: false`,
+			node:  "n1",
+			field: "Discoverable",
+			value: "false",
+		},
+		"fstab resource": {
+			nodesConf: `
+nodes:
+  n1:
+    resources:
+      fstab:
+        - file: /home
+          freq: 0
+          mntops: defaults
+          passno: 0
+          spec: warewulf:/home
+          vfstype: nfs`,
+			node:      "n1",
+			field:     "Resources[fstab]",
+			jsonValue: `[{"file":"/home","freq":0,"mntops":"defaults","passno":0,"spec":"warewulf:/home","vfstype":"nfs"}]`,
+		},
+		"disk partition": {
+			nodesConf: `
+nodes:
+  n1:
+    disks:
+      /dev/vda:
+        partitions:
+          rootfs:
+            resize: false`,
+			node:  "n1",
+			field: "Disks[/dev/vda].Partitions[rootfs].Resize",
+			value: "false",
+		},
 	}
 
 	for name, tt := range tests {
@@ -80,7 +128,12 @@ nodes:
 			node := registry.Nodes[tt.node]
 			value, err := getNestedFieldString(node, tt.field)
 			assert.NoError(t, err)
-			assert.Equal(t, tt.value, value)
+			if tt.value != "" {
+				assert.Equal(t, tt.value, value)
+			}
+			if tt.jsonValue != "" {
+				assert.JSONEq(t, tt.jsonValue, value)
+			}
 		})
 	}
 }

internal/pkg/node/mergo_test.go

@@ -194,15 +194,16 @@ nodeprofiles:
 
 func Test_MergeNode(t *testing.T) {
 	var tests = map[string]struct {
-		nodesConf string
-		node      string
-		field     string
-		source    string
-		value     string
-		nodes     []string
-		fields    []string
-		sources   []string
-		values    []string
+		nodesConf  string
+		node       string
+		field      string
+		source     string
+		value      string
+		nodes      []string
+		fields     []string
+		sources    []string
+		values     []string
+		jsonValues []string
 	}{
 		"node comment": {
 			nodesConf: `
@@ -779,10 +780,10 @@ nodes:
           file: /opt
           vfstype: nfs
 `,
-			nodes:   []string{"n1"},
-			fields:  []string{"Resources[fstab]"},
-			sources: []string{"p1,n1"},
-			values:  []string{"[map[file:/home spec:warewulf:/home vfstype:nfs] map[file:/opt spec:warewulf:/opt vfstype:nfs]]"},
+			nodes:      []string{"n1"},
+			fields:     []string{"Resources[fstab]"},
+			sources:    []string{"p1,n1"},
+			jsonValues: []string{`[{"file":"/home","spec":"warewulf:/home","vfstype":"nfs"},{"file":"/opt","spec":"warewulf:/opt","vfstype":"nfs"}]`},
 		},
 	}
 
@@ -817,8 +818,14 @@ nodes:
 				_, fields, _ := registry.MergeNode(tt.nodes[i])
 				value, valueErr := getNestedFieldString(nodes[i], tt.fields[i])
 				assert.NoError(t, valueErr)
-				assert.Equal(t, tt.values[i], value)
-				assert.Equal(t, tt.values[i], fields.Value(tt.fields[i]))
+				if len(tt.values) > i {
+					assert.Equal(t, tt.values[i], value)
+					assert.Equal(t, tt.values[i], fields.Value(tt.fields[i]))
+				}
+				if len(tt.jsonValues) > i {
+					assert.JSONEq(t, tt.jsonValues[i], value)
+					assert.Equal(t, tt.jsonValues[i], fields.Value(tt.fields[i]))
+				}
 				assert.Equal(t, tt.sources[i], fields.Source(tt.fields[i]))
 			}
 		})