func iNewLspServer(port int, params *LspParams) (*LspServer, error) {
srv := new(LspServer)
srv.nextId = 1
if params == nil {
// Insert default parameters
params = &LspParams{5, 2000}
}
srv.params = params
hostport := fmt.Sprintf(":%v", port)
addr, err := lspnet.ResolveUDPAddr("udp", hostport)
if lsplog.CheckReport(1, err) {
return nil, err
}
srv.udpConn, err = lspnet.ListenUDP("udp", addr)
if lsplog.CheckReport(1, err) {
return nil, err
}
srv.readBuf = NewBuf()
// Need enough room to recycle close messages
srv.appReadChan = make(LspMessageChan, 1)
srv.appWriteChan = make(LspMessageChan)
srv.netInChan = make(networkChan)
srv.epochChan = make(chan int)
srv.connById = make(map[uint16]*lspConn)
srv.connByAddr = make(map[string]*lspConn)
srv.closeReplyChan = make(chan error, 1)
srv.closeAllReplyChan = make(chan error, 1)
srv.writeReplyChan = make(chan error, 1)
go srv.serverLoop()
go srv.udpReader()
go epochTrigger(srv.params.EpochMilliseconds, srv.epochChan, &srv.stopGlobalNetworkFlag)
return srv, nil
}
func UDPResolve(hostport string) (*lspnet.UDPAddr, error) {
lsplog.Vlogf(3, "Attempting to resolve address of %s", hostport)
a, e := lspnet.ResolveUDPAddr(NET, hostport)
if e != nil {
lsplog.CheckFatal(e)
return nil, e
}
lsplog.Vlogf(3, "Address %s resolved", hostport)
return a, 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")
}