fix: remove extra and the actual original IDNA domain name is no longer stored, for reduce memory

rules/common/domain.go

@@ -9,9 +9,9 @@ import (
 
 type Domain struct {
 	*Base
-	domain    string
-	rawDomain string
-	adapter   string
+	domain  string
+	adapter string
+	isIDNA  bool
 }
 
 func (d *Domain) RuleType() C.RuleType {
@@ -30,16 +30,20 @@ func (d *Domain) Adapter() string {
 }
 
 func (d *Domain) Payload() string {
-	return d.rawDomain
+	domain := d.domain
+	if d.isIDNA {
+		domain, _ = idna.ToUnicode(domain)
+	}
+	return domain
 }
 
 func NewDomain(domain string, adapter string) *Domain {
 	actualDomain, _ := idna.ToASCII(domain)
 	return &Domain{
-		Base:      &Base{},
-		domain:    strings.ToLower(actualDomain),
-		adapter:   adapter,
-		rawDomain: domain,
+		Base:    &Base{},
+		domain:  strings.ToLower(actualDomain),
+		adapter: adapter,
+		isIDNA:  actualDomain != domain,
 	}
 }