add reload and plugin support for hop

listener/grpc/listener.go

@@ -1,6 +1,7 @@
 package grpc
 
 import (
+	"context"
 	"net"
 	"time"
 
@@ -54,7 +55,12 @@ func (l *grpcListener) Init(md md.Metadata) (err error) {
 	if xnet.IsIPv4(l.options.Addr) {
 		network = "tcp4"
 	}
-	ln, err := net.Listen(network, l.options.Addr)
+	lc := net.ListenConfig{}
+	if l.md.mptcp {
+		lc.SetMultipathTCP(true)
+		l.logger.Debugf("mptcp enabled: %v", lc.MultipathTCP())
+	}
+	ln, err := lc.Listen(context.Background(), network, l.options.Addr)
 	if err != nil {
 		return
 	}

listener/grpc/metadata.go

@@ -21,6 +21,7 @@ type metadata struct {
 	keepaliveTimeout             time.Duration
 	keepalivePermitWithoutStream bool
 	keepaliveMaxConnectionIdle   time.Duration
+	mptcp                        bool
 }
 
 func (l *grpcListener) parseMetadata(md mdata.Metadata) (err error) {
@@ -49,6 +50,7 @@ func (l *grpcListener) parseMetadata(md mdata.Metadata) (err error) {
 
 		l.md.keepalivePermitWithoutStream = mdutil.GetBool(md, "grpc.keepalive.permitWithoutStream", "keepalive.permitWithoutStream")
 		l.md.keepaliveMaxConnectionIdle = mdutil.GetDuration(md, "grpc.keepalive.maxConnectionIdle", "keepalive.maxConnectionIdle")
+		l.md.mptcp = mdutil.GetBool(md, "mptcp")
 	}
 
 	return