From 02e1cb180d046e2a9d120de00556456f5c6887ad Mon Sep 17 00:00:00 2001 From: Arceliar Date: Sat, 2 May 2020 17:23:20 -0500 Subject: [PATCH] possibly reduce multicast cpu usage even more --- src/multicast/multicast.go | 43 +++++++++++++++++++----------- src/multicast/multicast_darwin.go | 4 +-- src/multicast/multicast_other.go | 2 +- src/multicast/multicast_unix.go | 2 +- src/multicast/multicast_windows.go | 2 +- 5 files changed, 32 insertions(+), 21 deletions(-) diff --git a/src/multicast/multicast.go b/src/multicast/multicast.go index 28c9b4ec..4f0a3ff9 100644 --- a/src/multicast/multicast.go +++ b/src/multicast/multicast.go @@ -36,6 +36,8 @@ type Multicast struct { isOpen bool monitor *time.Timer platformhandler *time.Timer + _interfaces map[string]net.Interface + _interfaceAddrs map[string][]net.Addr } type multicastInterface struct { @@ -100,8 +102,8 @@ func (m *Multicast) _start() error { m.isOpen = true go m.listen() - m.Act(m, m.multicastStarted) - m.Act(m, m.monitorInterfaceChanges) + m.Act(nil, m._multicastStarted) + m.Act(nil, m._monitorInterfaceChanges) return nil } @@ -145,7 +147,7 @@ func (m *Multicast) _stop() error { // 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) }) + m.Act(nil, func() { m._updateConfig(config) }) } func (m *Multicast) _updateConfig(config *config.NodeConfig) { @@ -167,17 +169,14 @@ func (m *Multicast) _updateConfig(config *config.NodeConfig) { m.log.Debugln("Reloaded multicast configuration successfully") } -func (m *Multicast) monitorInterfaceChanges() { - interfaces := m.Interfaces() +func (m *Multicast) _monitorInterfaceChanges() { + m._updateInterfaces() // update interfaces and interfaceAddrs // Look for interfaces we don't know about yet. - for name, intf := range interfaces { + for name, intf := range m._interfaces { if _, ok := m.listeners[name]; !ok { // Look up interface addresses. - addrs, err := intf.Addrs() - if err != nil { - continue - } + addrs := m._interfaceAddrs[intf.Name] // Find the first link-local address. for _, addr := range addrs { addrIP, _, _ := net.ParseCIDR(addr.String()) @@ -198,7 +197,7 @@ func (m *Multicast) monitorInterfaceChanges() { stop: make(chan interface{}), zone: name, } - multicastInterface.Act(multicastInterface, multicastInterface.announce) + multicastInterface.Act(m, multicastInterface._announce) m.listeners[name] = multicastInterface m.log.Debugln("Started multicasting on", name) break @@ -207,7 +206,7 @@ func (m *Multicast) monitorInterfaceChanges() { } // Look for interfaces we knew about but are no longer there. for name, intf := range m.listeners { - if _, ok := interfaces[name]; !ok { + if _, ok := m._interfaces[name]; !ok { // This is a disappeared interface. Stop the announcer. close(intf.stop) delete(m.listeners, name) @@ -216,11 +215,11 @@ func (m *Multicast) monitorInterfaceChanges() { } // Queue the next check. m.monitor = time.AfterFunc(time.Second, func() { - m.Act(m, m.monitorInterfaceChanges) + m.Act(nil, m._monitorInterfaceChanges) }) } -func (m *multicastInterface) announce() { +func (m *multicastInterface) _announce() { // Check if the multicast interface has been stopped. This will happen // if it disappears from the system or goes down. select { @@ -240,7 +239,7 @@ func (m *multicastInterface) announce() { m.interval += time.Second } m.timer = time.AfterFunc(m.interval, func() { - m.Act(m, m.announce) + m.Act(nil, m._announce) }) } @@ -248,6 +247,14 @@ func (m *multicastInterface) announce() { // expected that UpdateInterfaces has been called at least once before calling // this method. func (m *Multicast) Interfaces() map[string]net.Interface { + var interfaces map[string]net.Interface + phony.Block(m, func() { + interfaces = m._interfaces + }) + return interfaces +} + +func (m *Multicast) _updateInterfaces() { interfaces := make(map[string]net.Interface) // Get interface expressions from config current := m.config.GetCurrent() @@ -258,6 +265,7 @@ func (m *Multicast) Interfaces() map[string]net.Interface { panic(err) } // Work out which interfaces to announce on + interfaceAddrs := make(map[string][]net.Addr) for _, iface := range allifaces { if iface.Flags&net.FlagUp == 0 { // Ignore interfaces that are down @@ -293,10 +301,12 @@ func (m *Multicast) Interfaces() map[string]net.Interface { // Does the interface match the regular expression? Store it if so if e.MatchString(iface.Name) { interfaces[iface.Name] = iface + interfaceAddrs[iface.Name] = addrs } } } - return interfaces + m._interfaces = interfaces + m._interfaceAddrs = interfaceAddrs } func (m *Multicast) listen() { @@ -333,6 +343,7 @@ func (m *Multicast) listen() { if addr.IP.String() != from.IP.String() { continue } + // Note that m.Interfaces would block if it was being run by the actor itself if _, ok := m.Interfaces()[from.Zone]; ok { addr.Zone = "" if err := m.core.CallPeer("tcp://"+addr.String(), from.Zone); err != nil { diff --git a/src/multicast/multicast_darwin.go b/src/multicast/multicast_darwin.go index 4cfef9e9..e020106b 100644 --- a/src/multicast/multicast_darwin.go +++ b/src/multicast/multicast_darwin.go @@ -31,7 +31,7 @@ import ( var awdlGoroutineStarted bool -func (m *Multicast) multicastStarted() { +func (m *Multicast) _multicastStarted() { C.StopAWDLBrowsing() for intf := range m.Interfaces() { if intf == "awdl0" { @@ -40,7 +40,7 @@ func (m *Multicast) multicastStarted() { } } m.platformhandler = time.AfterFunc(time.Minute, func() { - m.Act(m, m.multicastStarted) + m.Act(m, m._multicastStarted) }) } diff --git a/src/multicast/multicast_other.go b/src/multicast/multicast_other.go index 16ea15d6..dfcf625f 100644 --- a/src/multicast/multicast_other.go +++ b/src/multicast/multicast_other.go @@ -4,7 +4,7 @@ package multicast import "syscall" -func (m *Multicast) multicastStarted() { +func (m *Multicast) _multicastStarted() { } diff --git a/src/multicast/multicast_unix.go b/src/multicast/multicast_unix.go index 9d6a01a8..1ff48b17 100644 --- a/src/multicast/multicast_unix.go +++ b/src/multicast/multicast_unix.go @@ -5,7 +5,7 @@ package multicast import "syscall" import "golang.org/x/sys/unix" -func (m *Multicast) multicastStarted() { +func (m *Multicast) _multicastStarted() { } diff --git a/src/multicast/multicast_windows.go b/src/multicast/multicast_windows.go index 7a846b1e..3666faaa 100644 --- a/src/multicast/multicast_windows.go +++ b/src/multicast/multicast_windows.go @@ -5,7 +5,7 @@ package multicast import "syscall" import "golang.org/x/sys/windows" -func (m *Multicast) multicastStarted() { +func (m *Multicast) _multicastStarted() { }