Update code generator for plugin's dyn conf

cmd/internal/gen/centrifuge.go

@@ -12,6 +12,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"reflect"
 	"sort"
 	"strings"
 
@@ -183,15 +184,15 @@ func (c Centrifuge) writeStruct(name string, obj *types.Struct, rootPkg string,
 			continue
 		}
 
+		values, ok := lookupTagValue(obj.Tag(i), "json")
+		if len(values) > 0 && values[0] == "-" {
+			continue
+		}
+
 		b.WriteString(fmt.Sprintf("\t%s %s", field.Name(), fType))
 
-		tags := obj.Tag(i)
-		if tags != "" {
-			tg := extractJSONTag(tags)
-
-			if tg != `json:"-"` {
-				b.WriteString(fmt.Sprintf(" `%s`", tg))
-			}
+		if ok {
+			b.WriteString(fmt.Sprintf(" `json:\"%s\"`", strings.Join(values, ",")))
 		}
 
 		b.WriteString("\n")
@@ -202,16 +203,19 @@ func (c Centrifuge) writeStruct(name string, obj *types.Struct, rootPkg string,
 	return b.String()
 }
 
-func extractJSONTag(value string) string {
-	fields := strings.Fields(value)
-
-	for _, field := range fields {
-		if strings.HasPrefix(field, `json:"`) {
-			return field
-		}
+func lookupTagValue(raw, key string) ([]string, bool) {
+	value, ok := reflect.StructTag(raw).Lookup(key)
+	if !ok {
+		return nil, ok
 	}
 
-	return ""
+	values := strings.Split(value, ",")
+
+	if len(values) < 1 {
+		return nil, true
+	}
+
+	return values, true
 }
 
 func extractPackage(t types.Type) string {