read metric from urls for listen and peers

src/core/api.go

@@ -106,15 +106,15 @@ func (c *Core) GetSessions() []Session {
 // ListenTCP starts a new TCP listener. The input URI should match that of the
 // "Listen" configuration item, e.g.
 // 		tcp://a.b.c.d:e
-func (c *Core) ListenTCP(uri string) (*TcpListener, error) {
+func (c *Core) ListenTCP(uri string, metric uint8) (*TcpListener, error) {
-	return c.links.tcp.listen(uri, nil)
+	return c.links.tcp.listen(uri, nil, metric)
 }
 
 // ListenTLS starts a new TLS listener. The input URI should match that of the
 // "Listen" configuration item, e.g.
 // 		tls://a.b.c.d:e
-func (c *Core) ListenTLS(uri string) (*TcpListener, error) {
+func (c *Core) ListenTLS(uri string, metric uint8) (*TcpListener, error) {
-	return c.links.tcp.listen(uri, c.links.tcp.tls.forListener)
+	return c.links.tcp.listen(uri, c.links.tcp.tls.forListener, metric)
 }
 
 // Address gets the IPv6 address of the Yggdrasil node. This is always a /128

src/core/link.go

@@ -8,6 +8,7 @@ import (
 	"io"
 	"net"
 	"net/url"
+	"strconv"
 	"strings"
 	"sync"
 
@@ -52,6 +53,7 @@ type link struct {
 
 type linkOptions struct {
 	pinnedEd25519Keys map[keyArray]struct{}
+	metric            uint8
 }
 
 func (l *links) init(c *Core) error {
@@ -90,6 +92,10 @@ func (l *links) call(u *url.URL, sintf string) error {
 			}
 		}
 	}
+	if ms := u.Query()["metric"]; len(ms) == 1 {
+		m64, _ := strconv.ParseUint(ms[0], 10, 8)
+		tcpOpts.metric = uint8(m64)
+	}
 	switch u.Scheme {
 	case "tcp":
 		l.tcp.call(u.Host, tcpOpts, sintf)
@@ -110,23 +116,6 @@ func (l *links) call(u *url.URL, sintf string) error {
 	return nil
 }
 
-func (l *links) listen(uri string) error {
-	u, err := url.Parse(uri)
-	if err != nil {
-		return fmt.Errorf("listener %s is not correctly formatted (%s)", uri, err)
-	}
-	switch u.Scheme {
-	case "tcp":
-		_, err := l.tcp.listen(u.Host, nil)
-		return err
-	case "tls":
-		_, err := l.tcp.listen(u.Host, l.tcp.tls.forListener)
-		return err
-	default:
-		return errors.New("unknown listen scheme: " + u.Scheme)
-	}
-}
-
 func (l *links) create(conn net.Conn, name, linkType, local, remote string, incoming, force bool, options linkOptions) (*link, error) {
 	// Technically anything unique would work for names, but let's pick something human readable, just for debugging
 	intf := link{
@@ -158,7 +147,7 @@ func (intf *link) handler() (chan struct{}, error) {
 	defer intf.conn.Close()
 	meta := version_getBaseMetadata()
 	meta.key = intf.links.core.public
-	// TODO set meta.metric
+	meta.metric = intf.options.metric
 	metric := uint64(meta.metric)
 	metaBytes := meta.encode()
 	// TODO timeouts on send/recv (goroutine for send/recv, channel select w/ timer)

src/core/tcp.go

@@ -20,6 +20,7 @@ import (
 	"math/rand"
 	"net"
 	"net/url"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -50,7 +51,7 @@ type tcp struct {
 // multicast interfaces.
 type TcpListener struct {
 	Listener net.Listener
-	upgrade  *TcpUpgrade
+	opts     tcpOptions
 	stop     chan struct{}
 }
 
@@ -112,13 +113,18 @@ func (t *tcp) init(l *links) error {
 		if err != nil {
 			t.links.core.log.Errorln("Failed to parse listener: listener", listenaddr, "is not correctly formatted, ignoring")
 		}
+		var metric uint8 // TODO parse from url
+		if ms := u.Query()["metric"]; len(ms) == 1 {
+			m64, _ := strconv.ParseUint(ms[0], 10, 8)
+			metric = uint8(m64)
+		}
 		switch u.Scheme {
 		case "tcp":
-			if _, err := t.listen(u.Host, nil); err != nil {
+			if _, err := t.listen(u.Host, nil, metric); err != nil {
 				return err
 			}
 		case "tls":
-			if _, err := t.listen(u.Host, t.tls.forListener); err != nil {
+			if _, err := t.listen(u.Host, t.tls.forListener, metric); err != nil {
 				return err
 			}
 		default:
@@ -179,7 +185,7 @@ func (t *tcp) reconfigure() {
 	*/
 }
 
-func (t *tcp) listen(listenaddr string, upgrade *TcpUpgrade) (*TcpListener, error) {
+func (t *tcp) listen(listenaddr string, upgrade *TcpUpgrade, metric uint8) (*TcpListener, error) {
 	var err error
 
 	ctx := context.Background()
@@ -190,9 +196,10 @@ func (t *tcp) listen(listenaddr string, upgrade *TcpUpgrade) (*TcpListener, erro
 	if err == nil {
 		l := TcpListener{
 			Listener: listener,
-			upgrade:  upgrade,
+			opts:     tcpOptions{upgrade: upgrade},
 			stop:     make(chan struct{}),
 		}
+		l.opts.metric = metric
 		t.waitgroup.Add(1)
 		go t.listener(&l, listenaddr)
 		return &l, nil
@@ -243,9 +250,7 @@ func (t *tcp) listener(l *TcpListener, listenaddr string) {
 			continue
 		}
 		t.waitgroup.Add(1)
-		options := tcpOptions{
+		options := l.opts
-			upgrade: l.upgrade,
-		}
 		go t.handler(sock, true, options)
 	}
 }

src/multicast/multicast.go

@@ -274,7 +274,8 @@ func (m *Multicast) _announce() {
 			if nfo, ok := m.listeners[iface.Name]; !ok || nfo.listener.Listener == nil {
 				// No listener was found - let's create one
 				listenaddr := fmt.Sprintf("[%s%%%s]:%d", addrIP, iface.Name, m.listenPort)
-				if li, err := m.core.ListenTCP(listenaddr); err == nil {
+				var metric uint8 // TODO parse this from config
+				if li, err := m.core.ListenTCP(listenaddr, metric); err == nil {
 					m.log.Debugln("Started multicasting on", iface.Name)
 					// Store the listener so that we can stop it later if needed
 					info = &listenerInfo{listener: li, time: time.Now()}