update resolver

config/config.go

@@ -198,6 +198,8 @@ type NameserverConfig struct {
 	Hostname string        `yaml:",omitempty" json:"hostname,omitempty"`
 	TTL      time.Duration `yaml:",omitempty" json:"ttl,omitempty"`
 	Timeout  time.Duration `yaml:",omitempty" json:"timeout,omitempty"`
+	Async    bool          `yaml:",omitempty" json:"async,omitempty"`
+	Only     string        `yaml:",omitempty" json:"only,omitempty"`
 }
 
 type ResolverConfig struct {

config/parsing/resolver/parse.go

@@ -52,6 +52,8 @@ func ParseResolver(cfg *config.ResolverConfig) (resolver.Resolver, error) {
 			ClientIP: net.ParseIP(server.ClientIP),
 			Prefer:   server.Prefer,
 			Hostname: server.Hostname,
+			Async:    server.Async,
+			Only:     server.Only,
 		})
 	}