Created
May 18, 2018 10:51
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golang multicast client-server
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package main | |
import ( | |
"encoding/hex" | |
"log" | |
"net" | |
"time" | |
) | |
const ( | |
srvAddr = "224.0.0.1:9999" | |
maxDatagramSize = 8192 | |
) | |
func main() { | |
go ping(srvAddr) | |
serveMulticastUDP(srvAddr, msgHandler) | |
} | |
func ping(a string) { | |
log.Print("Start ping") | |
addr, err := net.ResolveUDPAddr("udp", a) | |
if err != nil { | |
log.Fatal(err) | |
} | |
c, err := net.DialUDP("udp", nil, addr) | |
for { | |
log.Print("Send hello") | |
c.Write([]byte("hello, world\n")) | |
time.Sleep(1 * time.Second) | |
} | |
} | |
func msgHandler(src *net.UDPAddr, n int, b []byte) { | |
log.Println(n, "bytes read from", src) | |
log.Println(hex.Dump(b[:n])) | |
} | |
func serveMulticastUDP(a string, h func(*net.UDPAddr, int, []byte)) { | |
log.Print("Start serve") | |
addr, err := net.ResolveUDPAddr("udp", a) | |
if err != nil { | |
log.Fatal(err) | |
} | |
log.Print("Listen addr: ", addr) | |
l, err := net.ListenMulticastUDP("udp", nil, addr) | |
if err != nil { | |
log.Fatal(err) | |
} | |
l.SetReadBuffer(maxDatagramSize) | |
for { | |
b := make([]byte, maxDatagramSize) | |
log.Print("Try to read data") | |
n, src, err := l.ReadFromUDP(b) | |
if err != nil { | |
log.Fatal("ReadFromUDP failed:", err) | |
} | |
log.Print("Datagram recived") | |
h(src, n, b) | |
} | |
} |
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