An OpenFlow Network Controller written in Go.
To process OpenFlow messages register a function that returns a pointer to an existing or new Application struct.
func NewDemoInstance() interface{} {
return &DemoInstance{}
}
controller.RegisterApplication(NewDemoInstance)
To receive OpenFlow messages, applications should implement the interfaces
found in protocol/ofp10/interface.go or protocol/ofp13/interface.go.
func (b *DemoInstance) ConnectionUp(dpid net.HardwareAddr) {
log.Println("Switch connected:", dpid)
}
func (b *DemoInstance) ConnectionDown(dpid net.HardwareAddr) {
log.Println("Switch disconnected:", dpid)
}
func (b *DemoInstance) PacketIn(dpid net.HardwareAddr, pkt *ofp10.PacketIn) {
log.Println("PacketIn message received from:", dpid)
}
Any struct that implements util.Message can be sent to the switch. Only
OpenFlow messages should be sent using OFSwitch.Send(m util.Message).
req := ofp10.NewEchoRequest()
// If switch dpid is known, returns its OFPSwitch struct. The
// switch is not guaranteed to have an active connection.
if sw, ok := ogo.Switch(dpid string); ok {
sw.Send(req)
}