chore: add /cache/dns/flush to restful api

component/resolver/resolver.go

@@ -230,10 +230,18 @@ func ResolveECH(ctx context.Context, host string) ([]byte, error) {
 	return ResolveECHWithResolver(ctx, host, DefaultResolver)
 }
 
+func ClearCache() {
+	if DefaultResolver != nil {
+		go DefaultResolver.ClearCache()
+	}
+	go SystemResolver.ClearCache() // SystemResolver unneeded check nil
+}
+
 func ResetConnection() {
 	if DefaultResolver != nil {
 		go DefaultResolver.ResetConnection()
 	}
+	go SystemResolver.ResetConnection() // SystemResolver unneeded check nil
 }
 
 func SortationAddr(ips []netip.Addr) (ipv4s, ipv6s []netip.Addr) {

dns/patch_android.go

@@ -9,12 +9,7 @@ import (
 var systemResolver []dnsClient
 
 func FlushCacheWithDefaultResolver() {
-	if r := resolver.DefaultResolver; r != nil {
-		r.ClearCache()
-	}
-	if r := resolver.SystemResolver; r != nil {
-		r.ClearCache()
-	}
+	resolver.ClearCache()
 	resolver.ResetConnection()
 }
 

hub/route/cache.go

@@ -12,6 +12,7 @@ import (
 func cacheRouter() http.Handler {
 	r := chi.NewRouter()
 	r.Post("/fakeip/flush", flushFakeIPPool)
+	r.Post("/dns/flush", flushDnsCache)
 	return r
 }
 
@@ -24,3 +25,8 @@ func flushFakeIPPool(w http.ResponseWriter, r *http.Request) {
 	}
 	render.NoContent(w, r)
 }
+
+func flushDnsCache(w http.ResponseWriter, r *http.Request) {
+	resolver.ClearCache()
+	render.NoContent(w, r)
+}