Geodat: Reduce peak memory usage (#5581)

Fixes 5f7474120f

app/router/condition.go

@@ -57,7 +57,8 @@ type DomainMatcher struct {
 
 func NewMphMatcherGroup(domains []*Domain) (*DomainMatcher, error) {
 	g := strmatcher.NewMphMatcherGroup()
-	for _, d := range domains {
+	for i, d := range domains {
+		domains[i] = nil
 		matcherType, f := matcherTypeMap[d.Type]
 		if !f {
 			errors.LogError(context.Background(), "ignore unsupported domain type ", d.Type, " of rule ", d.Value)

app/router/condition_geoip.go

@@ -822,7 +822,8 @@ func (f *GeoIPSetFactory) Create(cidrGroups ...[]*CIDR) (*GeoIPSet, error) {
 	var ipv4Builder, ipv6Builder netipx.IPSetBuilder
 
 	for _, cidrGroup := range cidrGroups {
-		for _, cidrEntry := range cidrGroup {
+		for i, cidrEntry := range cidrGroup {
+			cidrGroup[i] = nil
 			ipBytes := cidrEntry.GetIp()
 			prefixLen := int(cidrEntry.GetPrefix())
 

app/router/config.go

@@ -3,6 +3,7 @@ package router
 import (
 	"context"
 	"regexp"
+	"runtime"
 	"strings"
 
 	"github.com/xtls/xray-core/common/errors"
@@ -78,6 +79,8 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 			return nil, err
 		}
 		conds.Add(cond)
+		rr.Geoip = nil
+		runtime.GC()
 	}
 
 	if len(rr.SourceGeoip) > 0 {
@@ -86,6 +89,8 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 			return nil, err
 		}
 		conds.Add(cond)
+		rr.SourceGeoip = nil
+		runtime.GC()
 	}
 
 	if len(rr.LocalGeoip) > 0 {
@@ -95,6 +100,8 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 		}
 		conds.Add(cond)
 		errors.LogWarning(context.Background(), "Due to some limitations, in UDP connections, localIP is always equal to listen interface IP, so \"localIP\" rule condition does not work properly on UDP inbound connections that listen on all interfaces")
+		rr.LocalGeoip = nil
+		runtime.GC()
 	}
 
 	if len(rr.Domain) > 0 {
@@ -104,6 +111,8 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 		}
 		errors.LogDebug(context.Background(), "MphDomainMatcher is enabled for ", len(rr.Domain), " domain rule(s)")
 		conds.Add(matcher)
+		rr.Domain = nil
+		runtime.GC()
 	}
 
 	if len(rr.Process) > 0 {