feat: nameserver-policy support domain-set, reduce domain-set memory usage

hub/executor/executor.go

@@ -5,6 +5,7 @@ import (
 	"net/netip"
 	"os"
 	"runtime"
+	"strings"
 	"sync"
 
 	"github.com/Dreamacro/clash/adapter"
@@ -91,7 +92,7 @@ func ApplyConfig(cfg *config.Config, force bool) {
 	updateSniffer(cfg.Sniffer)
 	updateHosts(cfg.Hosts)
 	updateGeneral(cfg.General)
-	updateDNS(cfg.DNS, cfg.General.IPv6)
+	updateDNS(cfg.DNS, cfg.RuleProviders, cfg.General.IPv6)
 	updateListeners(cfg.General, cfg.Listeners, force)
 	updateIPTables(cfg)
 	updateTun(cfg.General)
@@ -178,7 +179,7 @@ func updateExperimental(c *config.Config) {
 	runtime.GC()
 }
 
-func updateDNS(c *config.DNS, generalIPv6 bool) {
+func updateDNS(c *config.DNS, ruleProvider map[string]provider.RuleProvider, generalIPv6 bool) {
 	if !c.Enable {
 		resolver.DefaultResolver = nil
 		resolver.DefaultHostMapper = nil
@@ -186,7 +187,25 @@ func updateDNS(c *config.DNS, generalIPv6 bool) {
 		dns.ReCreateServer("", nil, nil)
 		return
 	}
-
+	policy := make(map[string][]dns.NameServer)
+	domainSetPolicies := make(map[provider.RuleProvider][]dns.NameServer)
+	for key, nameservers := range c.NameServerPolicy {
+		temp := strings.Split(key, ":")
+		if len(temp) == 2 {
+			prefix := temp[0]
+			key := temp[1]
+			switch strings.ToLower(prefix) {
+			case "domain-set":
+				if p, ok := ruleProvider[key]; ok {
+					domainSetPolicies[p] = nameservers
+				} 
+			case "geosite":
+				// TODO:
+			}
+		} else {
+			policy[key] = nameservers
+		}
+	}
 	cfg := dns.Config{
 		Main:         c.NameServer,
 		Fallback:     c.Fallback,
@@ -205,6 +224,7 @@ func updateDNS(c *config.DNS, generalIPv6 bool) {
 		Default:     c.DefaultNameserver,
 		Policy:      c.NameServerPolicy,
 		ProxyServer: c.ProxyServerNameserver,
+		DomainSetPolicy: domainSetPolicies,
 	}
 
 	r := dns.NewResolver(cfg)