From 1cd4b6e8ddc8d72b67bb6fadf3896f2246e57425 Mon Sep 17 00:00:00 2001 From: Neil Alexander Date: Fri, 20 Sep 2019 10:08:41 +0100 Subject: [PATCH 1/2] Increase multicast interval at startup from 1s to 15s --- src/multicast/multicast.go | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/src/multicast/multicast.go b/src/multicast/multicast.go index 7f2f591..cc7b9af 100644 --- a/src/multicast/multicast.go +++ b/src/multicast/multicast.go @@ -29,6 +29,7 @@ type Multicast struct { listeners map[string]*yggdrasil.TcpListener listenPort uint16 isOpen bool + interval time.Duration announcer *time.Timer platformhandler *time.Timer } @@ -42,6 +43,7 @@ func (m *Multicast) Init(core *yggdrasil.Core, state *config.NodeState, log *log current := m.config.GetCurrent() m.listenPort = current.LinkLocalTCPPort m.groupAddr = "[ff02::114]:9001" + m.interval = time.Second return nil } @@ -245,9 +247,12 @@ func (m *Multicast) announce() { break } } - m.announcer = time.AfterFunc(time.Second*15, func() { + m.announcer = time.AfterFunc(m.interval, func() { m.Act(m, m.announce) }) + if m.interval.Seconds() < 15 { + m.interval += time.Second + } } func (m *Multicast) listen() { From 8003ea0f3ef61ac7c60651a5cef361d3d21804e8 Mon Sep 17 00:00:00 2001 From: Arceliar Date: Fri, 20 Sep 2019 17:42:42 -0500 Subject: [PATCH 2/2] use a separate multicast beacon interval per multicast interface --- src/multicast/multicast.go | 43 ++++++++++++++++++++++---------------- 1 file changed, 25 insertions(+), 18 deletions(-) diff --git a/src/multicast/multicast.go b/src/multicast/multicast.go index cc7b9af..7044eaa 100644 --- a/src/multicast/multicast.go +++ b/src/multicast/multicast.go @@ -26,24 +26,28 @@ type Multicast struct { log *log.Logger sock *ipv6.PacketConn groupAddr string - listeners map[string]*yggdrasil.TcpListener + listeners map[string]*listenerInfo listenPort uint16 isOpen bool - interval time.Duration announcer *time.Timer platformhandler *time.Timer } +type listenerInfo struct { + listener *yggdrasil.TcpListener + time time.Time + interval time.Duration +} + // Init prepares the multicast interface for use. func (m *Multicast) Init(core *yggdrasil.Core, state *config.NodeState, log *log.Logger, options interface{}) error { m.core = core m.config = state m.log = log - m.listeners = make(map[string]*yggdrasil.TcpListener) + m.listeners = make(map[string]*listenerInfo) current := m.config.GetCurrent() m.listenPort = current.LinkLocalTCPPort m.groupAddr = "[ff02::114]:9001" - m.interval = time.Second return nil } @@ -151,10 +155,10 @@ func (m *Multicast) announce() { interfaces := m.Interfaces() // There might be interfaces that we configured listeners for but are no // longer up - if that's the case then we should stop the listeners - for name, listener := range m.listeners { + for name, info := range m.listeners { // Prepare our stop function! stop := func() { - listener.Stop() + info.listener.Stop() delete(m.listeners, name) m.log.Debugln("No longer multicasting on", name) } @@ -167,7 +171,7 @@ func (m *Multicast) announce() { // It's possible that the link-local listener address has changed so if // that is the case then we should clean up the interface listener found := false - listenaddr, err := net.ResolveTCPAddr("tcp6", listener.Listener.Addr().String()) + listenaddr, err := net.ResolveTCPAddr("tcp6", info.listener.Listener.Addr().String()) if err != nil { stop() continue @@ -216,43 +220,46 @@ func (m *Multicast) announce() { // Join the multicast group m.sock.JoinGroup(&iface, groupAddr) // Try and see if we already have a TCP listener for this interface - var listener *yggdrasil.TcpListener - if l, ok := m.listeners[iface.Name]; !ok || l.Listener == nil { + var info *listenerInfo + 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 { m.log.Debugln("Started multicasting on", iface.Name) // Store the listener so that we can stop it later if needed - m.listeners[iface.Name] = li - listener = li + info = &listenerInfo{listener: li, time: time.Now()} + m.listeners[iface.Name] = info } else { m.log.Warnln("Not multicasting on", iface.Name, "due to error:", err) } } else { // An existing listener was found - listener = m.listeners[iface.Name] + info = m.listeners[iface.Name] } // Make sure nothing above failed for some reason - if listener == nil { + if info == nil { + continue + } + if time.Since(info.time) < info.interval { continue } // Get the listener details and construct the multicast beacon - lladdr := listener.Listener.Addr().String() + lladdr := info.listener.Listener.Addr().String() if a, err := net.ResolveTCPAddr("tcp6", lladdr); err == nil { a.Zone = "" destAddr.Zone = iface.Name msg := []byte(a.String()) m.sock.WriteTo(msg, nil, destAddr) } + if info.interval.Seconds() < 15 { + info.interval += time.Second + } break } } - m.announcer = time.AfterFunc(m.interval, func() { + m.announcer = time.AfterFunc(time.Second, func() { m.Act(m, m.announce) }) - if m.interval.Seconds() < 15 { - m.interval += time.Second - } } func (m *Multicast) listen() {