func (cli *LspClient) udpConnect() error {
lsplog.Vlogf(1, "[Client] Attempting to connect to %s:%d", cli.udpAddr.IP, cli.udpAddr.Port)
b, e := lspnet.DialUDP(NET, nil, cli.udpAddr)
if e != nil {
lsplog.CheckFatal(e)
return e
}
lsplog.Vlogf(6, "[Client] Connected to %s:%d", cli.udpAddr.IP, cli.udpAddr.Port)
cli.udpConn = b
return nil
}
func iNewLspClient(hostport string, params *LspParams) (*LspClient, error) {
cli := new(LspClient)
if params == nil {
// Insert default parameters
params = &LspParams{5, 2000}
}
cli.params = params
addr, err := lspnet.ResolveUDPAddr("udp", hostport)
if lsplog.CheckReport(1, err) {
return nil, err
}
cli.lspConn = newConn(addr, 0, 0)
// Client's first received message will be data message.
cli.lspConn.nextRecvSeqNum = NextSeqNum(0)
cli.udpConn, err = lspnet.DialUDP("udp", nil, addr)
if lsplog.CheckReport(1, err) {
return nil, err
}
// Need enough room to recycle close messages at end
cli.appReadChan = make(LspMessageChan, 2)
cli.readBuf = NewBuf()
cli.appWriteChan = make(LspMessageChan, 1)
cli.netInChan = make(LspMessageChan, 1)
cli.epochChan = make(chan int)
cli.closeReplyChan = make(chan error, 2)
cli.writeReplyChan = make(chan error, 2)
go cli.clientLoop()
go cli.udpReader()
go epochTrigger(cli.params.EpochMilliseconds, cli.epochChan, &cli.lspConn.stopNetworkFlag)
// Send connection request to server
nm := GenConnectMessage()
cli.udpWrite(nm)
cli.lspConn.pendingMsg = nm
cli.lspConn.nextSendSeqNum = NextSeqNum(0)
cm := <-cli.appReadChan
if cm.Type == MsgCONNECT {
return cli, nil
}
return nil, lsplog.MakeErr("Connection failed")
}