public async Task StopAsync()
{
ConnectionState curState;
lock (this) {
if ((curState = _state) != ConnectionState.Connected)
{
_setState(ConnectionState.Unbinding);
}
}
try {
if (curState == ConnectionState.Unbinding)
{
SMPPMessage response = await _submitMessage(new SMPPUnbind());
if (response.Status != CommandStatus.ESME_ROK)
{
throw new SMPPException("Response from server " + response.Status + ".");
}
_setState(ConnectionState.Stopped);
}
}
catch (Exception err) {
throw _setFailed(new SMPPException("Unbind failed.", err));
}
Close();
}
private async Task _sendMessage(SMPPMessage message)
{
using (await _sendLock.Enter()) {
if (!_isRunning)
{
throw new SMPPException("Connection is down.");
}
PduWriter writer = new PduWriter();
if ((message.Command & CommandSet.Response) == 0)
{
lock (this) {
message.Sequence = _sequence;
_sequence = (_sequence < 1000000000) ? _sequence + 1 : 1;
}
}
writer.WriteMessage(message);
byte[] pduData = writer.PduData();
#if DEBUG
Debug.WriteLine("SMPPConnection: SendMessage size=" + pduData.Length + " id=" + message.Command + " status=" + message.Status + " seq=" + message.Sequence);
#endif
try {
await _stream.WriteAsync(pduData, 0, pduData.Length);
}
catch (Exception err) {
throw _setFailed(new SMPPException("Send data to SMPP server failed", err));
}
}
}
private async void _cmdEnquire()
{
try {
if (_state == ConnectionState.Connected)
{
SMPPMessage response = await _submitMessage(new SMPPEnquireLink());
if (response.Status != CommandStatus.ESME_ROK)
{
throw new SMPPException("Response from server " + response.Status + ".");
}
_enquirePoll = EnquirePoll;
}
}
catch (Exception err) {
lock (this) {
if (_state == ConnectionState.Connected)
{
_setFailed(new SMPPException("EnquireLink failed", err));
if (_tcpClient != null)
{
_tcpClient.Client.Close();
}
}
}
}
}
public Task <SMPPMessage> SubmitMessageAsync(SMPPMessage message)
{
if (_state != ConnectionState.Connected)
{
throw new SMPPException("Not connected.");
}
return(_submitMessage(message));
}
public ActiveRequest AddMessage(SMPPMessage message)
{
ActiveRequest sendingMessage = new ActiveRequest(message);
lock (this) {
base.Add(sendingMessage);
}
return(sendingMessage);
}
public void CompleteResp(SMPPMessage message)
{
ActiveRequest sendingMessage;
lock (this) {
int idx = _findMessage(message);
sendingMessage = base[idx];
base.RemoveAt(idx);
}
sendingMessage.TaskCompletion.SetResult(message);
}
private async void _sendMessageAsync(SMPPMessage message)
{
try {
await _sendMessage(message);
}
catch (Exception err) {
if (_isRunning)
{
_setFailed(new SMPPException("SendMessage failed.", err));
}
}
}
private int _findMessage(SMPPMessage message)
{
for (int i = 0; i < base.Count; ++i)
{
if (base[i].Message.Sequence == message.Sequence &&
(base[i].Message.Command == (message.Command & ~CommandSet.Response) || message.Command == CommandSet.GenericNack))
{
return(i);
}
}
throw new SMPPException("Received response for a unknown message.");
}
private Task <SMPPMessage> _submitMessage(SMPPMessage message)
{
ActiveRequest sendingMessage = _activeRequests.AddMessage(message);
sendingMessage.SendTask = _sendMessage(message);
sendingMessage.SendTask.ContinueWith((task) =>
{
if (task.Status != TaskStatus.RanToCompletion)
{
_activeRequests.CompleteError(sendingMessage, task.Exception);
}
});
return(sendingMessage.TaskCompletion.Task);
}
private async Task _run()
{
try {
_enquirePoll = int.MaxValue;
using (new System.Threading.Timer(_poll, null, 1000, 1000)) {
while (_isRunning)
{
SMPPMessage message = await _recvMessage();
switch (message.Command)
{
case CommandSet.EnquireLink:
_recvEnquireLink((SMPPEnquireLink)message);
break;
case CommandSet.DeliverSm:
_recvDeliverSm((SMPPDeliverSm)message);
break;
case CommandSet.Unbind:
await _recvUnbind((SMPPUnbind)message);
break;
case CommandSet.GenericNack:
case CommandSet.BindReceiverResp:
case CommandSet.BindTransceiverResp:
case CommandSet.BindTransmitterResp:
case CommandSet.SubmitSmResp:
case CommandSet.EnquireLinkResp:
case CommandSet.UnbindResp:
_activeRequests.CompleteResp(message);
break;
default: throw new NotImplementedException("No handler for " + message.Command);
}
}
}
}
catch (Exception err) {
if (_isRunning)
{
_setFailed(err);
}
_activeRequests.ConnectionDown();
}
}
public ActiveRequest(SMPPMessage message)
{
Message = message;
TimeoutTicks = 15;
TaskCompletion = new TaskCompletionSource <SMPPMessage>();
}
public async Task ConnectAsync()
{
// Init
lock (this) {
if (_state != ConnectionState.Closed)
{
throw new SMPPException("SMPPConnection busy.");
}
_tcpClient = new TcpClient();
_sendLock = new TaskLock();
_error = null;
_sequence = 1;
}
Exception error = null;
// Connect to SMPP server
try {
Stream stream;
using (new System.Threading.Timer((object state) =>
{
lock (this) {
if (_state == ConnectionState.Connecting || _state == ConnectionState.SslHandshake)
{
error = new TimeoutException("Timeout");
_tcpClient.Close();
}
}
},
null, 15 * 1000, System.Threading.Timeout.Infinite))
{
_setState(ConnectionState.Connecting);
await _tcpClient.ConnectAsync(Hostname, Port);
stream = _tcpClient.GetStream();
if (Tls)
{
_setState(ConnectionState.SslHandshake);
SslStream sslStream = new SslStream(stream, true);
await sslStream.AuthenticateAsClientAsync(Hostname);
stream = sslStream;
}
}
lock (this) {
if (error != null)
{
throw error;
}
_setState(ConnectionState.StreamConnected);
_stream = stream;
}
}
catch (Exception err) {
if (err is ObjectDisposedException || err is NullReferenceException)
{
lock (this) {
if (error != null)
{
err = error;
}
else
if (_state == ConnectionState.Closed)
{
err = new SMPPException("Connect aborted by close.");
}
}
}
err = _setFailed(new SMPPException("Connect failed.", err));
Close();
throw err;
}
// Start comtask
Task _ = _run();
// Bind
try {
_setState(ConnectionState.Binding);
SMPPMessage response = await _submitMessage(Bind);
if (response.Status != CommandStatus.ESME_ROK)
{
throw new SMPPException("Response from server " + response.Status + ".");
}
_setState(ConnectionState.Connected);
_enquirePoll = EnquirePoll;
}
catch (Exception err) {
throw _setFailed(new SMPPException("Bind failed", err));
}
}