Fix dependency cycle caused by core import in internet package

main/distro/all/all.go

@@ -23,6 +23,8 @@ import (
 	_ "github.com/v2fly/v2ray-core/v4/app/router"
 	_ "github.com/v2fly/v2ray-core/v4/app/stats"
 
+	_ "github.com/v2fly/v2ray-core/v4/transport/internet/tagged/taggedimpl"
+
 	// Inbound and outbound proxies.
 	_ "github.com/v2fly/v2ray-core/v4/proxy/blackhole"
 	_ "github.com/v2fly/v2ray-core/v4/proxy/dns"

transport/internet/dialer.go

@@ -2,8 +2,7 @@ package internet
 
 import (
 	"context"
-	core "github.com/v2fly/v2ray-core/v4"
+	"github.com/v2fly/v2ray-core/v4/transport/internet/tagged"
-	"github.com/v2fly/v2ray-core/v4/features/routing"
 
 	"github.com/v2fly/v2ray-core/v4/common/net"
 	"github.com/v2fly/v2ray-core/v4/common/session"
@@ -79,28 +78,8 @@ func DialSystem(ctx context.Context, dest net.Destination, sockopt *SocketConfig
 }
 
 func DialTaggedOutbound(ctx context.Context, dest net.Destination, tag string) (net.Conn, error) {
-	var dispatcher routing.Dispatcher
+	if tagged.Dialer == nil {
-	if err := core.RequireFeatures(ctx, func(dispatcherInstance routing.Dispatcher) {
+		return nil, newError("tagged dial not enabled")
-		dispatcher = dispatcherInstance
-	}); err != nil {
-		return nil, newError("Required Feature dispatcher not resolved").Base(err)
 	}
-
+	return tagged.Dialer(ctx, dest, tag)
-	content := new(session.Content)
-	content.SkipDNSResolve = true
-	session.SetForcedOutboundTagToContext(ctx, tag)
-
-	ctx = session.ContextWithContent(ctx, content)
-
-	r, err := dispatcher.Dispatch(ctx, dest)
-	if err != nil {
-		return nil, err
-	}
-	var readerOpt net.ConnectionOption
-	if dest.Network == net.Network_TCP {
-		readerOpt = net.ConnectionOutputMulti(r.Reader)
-	} else {
-		readerOpt = net.ConnectionOutputMultiUDP(r.Reader)
-	}
-	return net.NewConnection(net.ConnectionInputMulti(r.Writer), readerOpt), nil
 }

transport/internet/tagged/tagged.go

@@ -0,0 +1,10 @@
+package tagged
+
+import (
+	"context"
+	"github.com/v2fly/v2ray-core/v4/common/net"
+)
+
+type DialFunc func(ctx context.Context, dest net.Destination, tag string) (net.Conn, error)
+
+var Dialer DialFunc

transport/internet/tagged/taggedimpl/impl.go

@@ -0,0 +1,41 @@
+package taggedimpl
+
+import (
+	"context"
+	core "github.com/v2fly/v2ray-core/v4"
+	"github.com/v2fly/v2ray-core/v4/common/net"
+	"github.com/v2fly/v2ray-core/v4/common/session"
+	"github.com/v2fly/v2ray-core/v4/features/routing"
+	"github.com/v2fly/v2ray-core/v4/transport/internet/tagged"
+)
+
+func DialTaggedOutbound(ctx context.Context, dest net.Destination, tag string) (net.Conn, error) {
+	var dispatcher routing.Dispatcher
+	if err := core.RequireFeatures(ctx, func(dispatcherInstance routing.Dispatcher) {
+		dispatcher = dispatcherInstance
+	}); err != nil {
+		return nil, newError("Required Feature dispatcher not resolved").Base(err)
+	}
+
+	content := new(session.Content)
+	content.SkipDNSResolve = true
+	session.SetForcedOutboundTagToContext(ctx, tag)
+
+	ctx = session.ContextWithContent(ctx, content)
+
+	r, err := dispatcher.Dispatch(ctx, dest)
+	if err != nil {
+		return nil, err
+	}
+	var readerOpt net.ConnectionOption
+	if dest.Network == net.Network_TCP {
+		readerOpt = net.ConnectionOutputMulti(r.Reader)
+	} else {
+		readerOpt = net.ConnectionOutputMultiUDP(r.Reader)
+	}
+	return net.NewConnection(net.ConnectionInputMulti(r.Writer), readerOpt), nil
+}
+
+func init() {
+	tagged.Dialer = DialTaggedOutbound
+}

transport/internet/tagged/taggedimpl/taggedimpl.go

@@ -0,0 +1,3 @@
+package taggedimpl
+
+//go:generate go run github.com/v2fly/v2ray-core/v4/common/errors/errorgen