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transport_udp.go
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transport_udp.go
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package transport
import (
"github.com/annttu/gossip/base"
"github.com/annttu/gossip/log"
"github.com/annttu/gossip/parser"
)
import (
"net"
)
type Udp struct {
listeningPoints []*net.UDPConn
output chan base.SipMessage
stop bool
}
func NewUdp(output chan base.SipMessage) (*Udp, error) {
newUdp := Udp{listeningPoints: make([]*net.UDPConn, 0), output: output}
return &newUdp, nil
}
func (udp *Udp) Listen(address string) error {
addr, err := net.ResolveUDPAddr("udp", address)
if err != nil {
return err
}
lp, err := net.ListenUDP("udp", addr)
if err == nil {
udp.listeningPoints = append(udp.listeningPoints, lp)
go udp.listen(lp)
}
return err
}
func (udp *Udp) IsStreamed() bool {
return false
}
func (udp *Udp) Send(addr string, msg base.SipMessage) error {
log.Debug("Sending message %s to %s", msg.Short(), addr)
raddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return err
}
var conn *net.UDPConn
conn, err = net.DialUDP("udp", nil, raddr)
if err != nil {
return err
}
defer conn.Close()
_, err = conn.Write([]byte(msg.String()))
return err
}
func (udp *Udp) listen(conn *net.UDPConn) {
log.Info("Begin listening for UDP on address %s", conn.LocalAddr())
buffer := make([]byte, c_BUFSIZE)
for {
num, _, err := conn.ReadFromUDP(buffer)
if err != nil {
if udp.stop {
log.Info("Stopped listening for UDP on %s", conn.LocalAddr)
break
} else {
log.Severe("Failed to read from UDP buffer: " + err.Error())
continue
}
}
pkt := append([]byte(nil), buffer[:num]...)
go func() {
msg, err := parser.ParseMessage(pkt)
if err != nil {
log.Warn("Failed to parse SIP message: %s", err.Error())
} else {
udp.output <- msg
}
}()
}
}
func (udp *Udp) Stop() {
udp.stop = true
for _, lp := range udp.listeningPoints {
lp.Close()
}
}