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udp_listener.go
53 lines (43 loc) · 833 Bytes
/
udp_listener.go
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package udp_listener
import (
"fmt"
"net"
"sync/atomic"
)
var UdpListeningPort = &port{42420}
func Run(dataChan chan<- []byte, stopChan <-chan struct{}) error {
conn, err := net.ListenPacket("udp", fmt.Sprintf(":%d", UdpListeningPort.Get()))
if err != nil {
return err
}
UdpListeningPort.Set(conn.LocalAddr().(*net.UDPAddr).Port)
go func() {
<-stopChan
conn.Close()
}()
for {
buffer := make([]byte, 4096)
var n int
n, _, err = conn.ReadFrom(buffer)
if err != nil {
select {
case <-stopChan:
err = nil
default:
}
return err
}
select {
case dataChan <- buffer[0:n]:
case <-stopChan:
return nil
}
}
}
type port struct{ val int32 }
func (p *port) Set(val int) {
atomic.StoreInt32(&p.val, int32(val))
}
func (p *port) Get() int {
return int(atomic.LoadInt32(&p.val))
}