func startVoting() {
fmt.Println("Start voting!")
time.Sleep(time.Second * 10)
// Send you adress to all. In this case it really doesn't matter
msg := message.NewVoteMessage(myAddress)
mm, _ := xml.Marshal(msg)
_, err := writeMulticast.WriteToUDP(mm, multicastAddr)
check(err)
// Wait 10 seconds
c := time.After(time.Second * 10)
<-c
// Check if we got any address that is bigger
for addr, _ := range knownAddresess {
if addr > myAddress {
return
}
}
// Become the server if we are the greatest
msga := message.NewCoordinatorMessage(string(myAddress))
mmm, _ := xml.Marshal(msga)
writeMulticast.WriteToUDP(mmm, multicastAddr)
fmt.Println("NOW I AM BECOME DEATH")
}
func main() {
port := "224.0.1.60:1888"
laddr, err := net.ResolveUDPAddr("udp", ":0")
check(err)
mcaddr, err := net.ResolveUDPAddr("udp", port)
check(err)
conn, err := net.ListenMulticastUDP("udp", nil, mcaddr)
check(err)
lconn, err := net.ListenUDP("udp", laddr)
check(err)
reader := bufio.NewReader(os.Stdin)
knownAddresess = make(map[int]bool, 1)
myAddress = os.Getpid()
log.Println("My address is ", myAddress)
msg := message.NewVoteMessage(myAddress)
mm, _ := xml.Marshal(msg)
fmt.Println(string(mm))
listenMulticast = conn
writeMulticast = lconn
multicastAddr = mcaddr
go listen(listenMulticast)
go startVoting()
for {
// Sleep 20 seconds to give time to spawn more clients
// time.Sleep(time.Second * 10)
txt, _, err := reader.ReadLine()
b := make([]byte, 256)
copy(b, txt)
check(err)
_, err = writeMulticast.WriteToUDP(b, mcaddr)
check(err)
}
}
func broadcastMessageWithMyPid(myaddr int) {
msg := message.NewVoteMessage(myaddr)
mm, _ := xml.Marshal(msg)
_, err := writeMulticast.WriteToUDP(mm, multicastAddr)
if err != nil {
log.Println("[Client] [On multicast] Error sending myPid", err)
}
}