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listener_udp.go
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listener_udp.go
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package dctoolkit
import (
"fmt"
"net"
)
type listenerUdp struct {
client *Client
terminateRequested bool
listener net.PacketConn
}
func newListenerUdp(client *Client) error {
listener, err := net.ListenPacket("udp", fmt.Sprintf(":%d", client.conf.UdpPort))
if err != nil {
return err
}
client.listenerUdp = &listenerUdp{
client: client,
listener: listener,
}
return nil
}
func (u *listenerUdp) close() {
if u.terminateRequested == true {
return
}
u.terminateRequested = true
u.listener.Close()
}
func (u *listenerUdp) do() {
defer u.client.wg.Done()
var buf [2048]byte
for {
n, _, err := u.listener.ReadFrom(buf[:])
// listener closed
if err != nil {
break
}
msgStr := string(buf[:n])
u.client.Safe(func() {
err := func() error {
if u.client.protoIsAdc == true {
if msgStr[len(msgStr)-1] != '\n' {
return fmt.Errorf("wrong terminator")
}
msgStr = msgStr[:len(msgStr)-1]
if msgStr[:5] != "URES " {
return fmt.Errorf("wrong command")
}
msg := &msgAdcUSearchResult{}
n, err := msg.AdcTypeDecode(msgStr[5:])
if err != nil {
return fmt.Errorf("unable to decode command type")
}
err = msg.AdcKeyDecode(msgStr[5+n:])
if err != nil {
return fmt.Errorf("unable to decode command key")
}
p := u.client.peerByClientId(msg.ClientId)
if p == nil {
return fmt.Errorf("unknown author")
}
u.client.handleAdcSearchResult(true, p, &msg.msgAdcKeySearchResult)
return nil
} else {
if msgStr[len(msgStr)-1] != '|' {
return fmt.Errorf("wrong terminator")
}
msgStr = msgStr[:len(msgStr)-1]
matches := reNmdcCommand.FindStringSubmatch(msgStr)
if matches == nil {
return fmt.Errorf("wrong syntax")
}
// udp is used only for search results
if matches[1] != "SR" {
return fmt.Errorf("wrong command")
}
msg := &msgNmdcSearchResult{}
err = msg.NmdcDecode(matches[3])
if err != nil {
return fmt.Errorf("wrong search result")
}
p := u.client.peerByNick(msg.Nick)
if p == nil {
return fmt.Errorf("unknown author")
}
u.client.handleNmdcSearchResult(true, p, msg)
return nil
}
}()
if err != nil {
dolog(LevelDebug, "[udp] unable to parse: %s", err)
}
})
}
}