perf(GeoIPMatcher): faster heuristic matching with reduced memory usage

app/dns/nameserver.go

@@ -29,8 +29,8 @@ type Client struct {
 	server        Server
 	skipFallback  bool
 	domains       []string
-	expectedIPs   []*router.GeoIPMatcher
-	unexpectedIPs []*router.GeoIPMatcher
+	expectedIPs   router.GeoIPMatcher
+	unexpectedIPs router.GeoIPMatcher
 	actPrior      bool
 	actUnprior    bool
 	tag           string
@@ -154,23 +154,21 @@ func NewClient(
 		}
 
 		// Establish expected IPs
-		var expectedMatchers []*router.GeoIPMatcher
-		for _, geoip := range ns.ExpectedGeoip {
-			matcher, err := router.GlobalGeoIPContainer.Add(geoip)
+		var expectedMatcher router.GeoIPMatcher
+		if len(ns.ExpectedGeoip) > 0 {
+			expectedMatcher, err = router.BuildOptimizedGeoIPMatcher(ns.ExpectedGeoip...)
 			if err != nil {
 				return errors.New("failed to create expected ip matcher").Base(err).AtWarning()
 			}
-			expectedMatchers = append(expectedMatchers, matcher)
 		}
 
 		// Establish unexpected IPs
-		var unexpectedMatchers []*router.GeoIPMatcher
-		for _, geoip := range ns.UnexpectedGeoip {
-			matcher, err := router.GlobalGeoIPContainer.Add(geoip)
+		var unexpectedMatcher router.GeoIPMatcher
+		if len(ns.UnexpectedGeoip) > 0 {
+			unexpectedMatcher, err = router.BuildOptimizedGeoIPMatcher(ns.UnexpectedGeoip...)
 			if err != nil {
 				return errors.New("failed to create unexpected ip matcher").Base(err).AtWarning()
 			}
-			unexpectedMatchers = append(unexpectedMatchers, matcher)
 		}
 
 		if len(clientIP) > 0 {
@@ -192,8 +190,8 @@ func NewClient(
 		client.server = server
 		client.skipFallback = ns.SkipFallback
 		client.domains = rules
-		client.expectedIPs = expectedMatchers
-		client.unexpectedIPs = unexpectedMatchers
+		client.expectedIPs = expectedMatcher
+		client.unexpectedIPs = unexpectedMatcher
 		client.actPrior = ns.ActPrior
 		client.actUnprior = ns.ActUnprior
 		client.tag = tag
@@ -243,32 +241,32 @@ func (c *Client) QueryIP(ctx context.Context, domain string, option dns.IPOption
 		return nil, 0, dns.ErrEmptyResponse
 	}
 
-	if len(c.expectedIPs) > 0 && !c.actPrior {
-		ips = router.MatchIPs(c.expectedIPs, ips, false)
+	if c.expectedIPs != nil && !c.actPrior {
+		ips, _ = c.expectedIPs.FilterIPs(ips)
 		errors.LogDebug(context.Background(), "domain ", domain, " expectedIPs ", ips, " matched at server ", c.Name())
 		if len(ips) == 0 {
 			return nil, 0, dns.ErrEmptyResponse
 		}
 	}
 
-	if len(c.unexpectedIPs) > 0 && !c.actUnprior {
-		ips = router.MatchIPs(c.unexpectedIPs, ips, true)
+	if c.unexpectedIPs != nil && !c.actUnprior {
+		_, ips = c.unexpectedIPs.FilterIPs(ips)
 		errors.LogDebug(context.Background(), "domain ", domain, " unexpectedIPs ", ips, " matched at server ", c.Name())
 		if len(ips) == 0 {
 			return nil, 0, dns.ErrEmptyResponse
 		}
 	}
 
-	if len(c.expectedIPs) > 0 && c.actPrior {
-		ipsNew := router.MatchIPs(c.expectedIPs, ips, false)
+	if c.expectedIPs != nil && c.actPrior {
+		ipsNew, _ := c.expectedIPs.FilterIPs(ips)
 		if len(ipsNew) > 0 {
 			ips = ipsNew
 			errors.LogDebug(context.Background(), "domain ", domain, " priorIPs ", ips, " matched at server ", c.Name())
 		}
 	}
 
-	if len(c.unexpectedIPs) > 0 && c.actUnprior {
-		ipsNew := router.MatchIPs(c.unexpectedIPs, ips, true)
+	if c.unexpectedIPs != nil && c.actUnprior {
+		_, ipsNew := c.unexpectedIPs.FilterIPs(ips)
 		if len(ipsNew) > 0 {
 			ips = ipsNew
 			errors.LogDebug(context.Background(), "domain ", domain, " unpriorIPs ", ips, " matched at server ", c.Name())

app/router/condition.go

@@ -96,61 +96,53 @@ func (m *DomainMatcher) Apply(ctx routing.Context) bool {
 	return m.ApplyDomain(domain)
 }
 
-type MultiGeoIPMatcher struct {
-	matchers []*GeoIPMatcher
-	asType   string // local, source, target
-}
+type MatcherAsType byte
 
-func NewMultiGeoIPMatcher(geoips []*GeoIP, asType string) (*MultiGeoIPMatcher, error) {
-	var matchers []*GeoIPMatcher
-	for _, geoip := range geoips {
-		matcher, err := GlobalGeoIPContainer.Add(geoip)
-		if err != nil {
-			return nil, err
-		}
-		matchers = append(matchers, matcher)
-	}
+const (
+	MatcherAsType_Local MatcherAsType = iota
+	MatcherAsType_Source
+	MatcherAsType_Target
+	MatcherAsType_VlessRoute // for port
+)
 
-	matcher := &MultiGeoIPMatcher{
-		matchers: matchers,
-		asType:   asType,
-	}
+type IPMatcher struct {
+	matcher GeoIPMatcher
+	asType  MatcherAsType
+}
 
-	return matcher, nil
+func NewIPMatcher(geoips []*GeoIP, asType MatcherAsType) (*IPMatcher, error) {
+	matcher, err := BuildOptimizedGeoIPMatcher(geoips...)
+	if err != nil {
+		return nil, err
+	}
+	return &IPMatcher{matcher: matcher, asType: asType}, nil
 }
 
 // Apply implements Condition.
-func (m *MultiGeoIPMatcher) Apply(ctx routing.Context) bool {
+func (m *IPMatcher) Apply(ctx routing.Context) bool {
 	var ips []net.IP
 
 	switch m.asType {
-	case "local":
+	case MatcherAsType_Local:
 		ips = ctx.GetLocalIPs()
-	case "source":
+	case MatcherAsType_Source:
 		ips = ctx.GetSourceIPs()
-	case "target":
+	case MatcherAsType_Target:
 		ips = ctx.GetTargetIPs()
 	default:
-		panic("unreachable, asType should be local or source or target")
+		panic("unk asType")
 	}
 
-	for _, ip := range ips {
-		for _, matcher := range m.matchers {
-			if matcher.Match(ip) {
-				return true
-			}
-		}
-	}
-	return false
+	return m.matcher.AnyMatch(ips)
 }
 
 type PortMatcher struct {
 	port   net.MemoryPortList
-	asType string // local, source, target
+	asType MatcherAsType
 }
 
 // NewPortMatcher create a new port matcher that can match source or local or destination port
-func NewPortMatcher(list *net.PortList, asType string) *PortMatcher {
+func NewPortMatcher(list *net.PortList, asType MatcherAsType) *PortMatcher {
 	return &PortMatcher{
 		port:   net.PortListFromProto(list),
 		asType: asType,
@@ -160,18 +152,17 @@ func NewPortMatcher(list *net.PortList, asType string) *PortMatcher {
 // Apply implements Condition.
 func (v *PortMatcher) Apply(ctx routing.Context) bool {
 	switch v.asType {
-	case "local":
+	case MatcherAsType_Local:
 		return v.port.Contains(ctx.GetLocalPort())
-	case "source":
+	case MatcherAsType_Source:
 		return v.port.Contains(ctx.GetSourcePort())
-	case "target":
+	case MatcherAsType_Target:
 		return v.port.Contains(ctx.GetTargetPort())
-	case "vlessRoute":
+	case MatcherAsType_VlessRoute:
 		return v.port.Contains(ctx.GetVlessRoute())
 	default:
-		panic("unreachable, asType should be local or source or target")
+		panic("unk asType")
 	}
-
 }
 
 type NetworkMatcher struct {