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Backport fix for #581 from #583

This commit is contained in:
Neil Alexander 2019-10-24 09:25:31 +01:00
parent c3dee478f5
commit f784f33c2d
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GPG Key ID: A02A2019A2BB0944

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@ -55,6 +55,21 @@ func (m *Multicast) Init(core *yggdrasil.Core, state *config.NodeState, log *log
// listen for multicast beacons from other hosts and will advertise multicast
// beacons out to the network.
func (m *Multicast) Start() error {
var err error
phony.Block(m, func() {
err = m._start()
})
return err
}
func (m *Multicast) _start() error {
if m.isOpen {
return fmt.Errorf("multicast module is already started")
}
if len(m.config.GetCurrent().MulticastInterfaces) == 0 {
return fmt.Errorf("no MulticastInterfaces configured")
}
m.log.Infoln("Starting multicast module")
addr, err := net.ResolveUDPAddr("udp", m.groupAddr)
if err != nil {
return err
@ -80,8 +95,22 @@ func (m *Multicast) Start() error {
return nil
}
// Stop is not implemented for multicast yet.
func (m *Multicast) Stop() error {
// IsStarted returns true if the module has been started.
func (m *Multicast) IsStarted() bool {
var isOpen bool
phony.Block(m, func() {
isOpen = m.isOpen
})
return isOpen
}
// Stop stops the multicast module.
func (m *Multicast) Stop() {
m.Act(m, m._stop)
}
func (m *Multicast) _stop() {
m.log.Infoln("Stopping multicast module")
m.isOpen = false
if m.announcer != nil {
m.announcer.Stop()
@ -90,15 +119,27 @@ func (m *Multicast) Stop() error {
m.platformhandler.Stop()
}
m.sock.Close()
return nil
}
// UpdateConfig updates the multicast module with the provided config.NodeConfig
// and then signals the various module goroutines to reconfigure themselves if
// needed.
func (m *Multicast) UpdateConfig(config *config.NodeConfig) {
m.Act(m, func() { m._updateConfig(config) })
}
func (m *Multicast) _updateConfig(config *config.NodeConfig) {
m.log.Debugln("Reloading multicast configuration...")
if m.IsStarted() {
if len(config.MulticastInterfaces) == 0 || config.LinkLocalTCPPort != m.listenPort {
m.Stop()
}
}
m.config.Replace(*config)
m.listenPort = config.LinkLocalTCPPort
if !m.IsStarted() && len(config.MulticastInterfaces) > 0 {
m.Start()
}
}
// GetInterfaces returns the currently known/enabled multicast interfaces. It is