NetCoreServer/source/NetCoreServer/UdpClient.cs at master · bubdm/NetCoreServer · GitHub

Repository navigation

History

902 lines (766 loc) · 31.6 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

583

584

585

586

587

588

589

590

591

592

593

594

595

596

597

598

599

600

601

602

603

604

605

606

607

608

609

610

611

612

613

614

615

616

617

618

619

620

621

622

623

624

625

626

627

628

629

630

631

632

633

634

635

636

637

638

639

640

641

642

643

644

645

646

647

648

649

650

651

652

653

654

655

656

657

658

659

660

661

662

663

664

665

666

667

668

669

670

671

672

673

674

675

676

677

678

679

680

681

682

683

684

685

686

687

688

689

690

691

692

693

694

695

696

697

698

699

700

701

702

703

704

705

706

707

708

709

710

711

712

713

714

715

716

717

718

719

720

721

722

723

724

725

726

727

728

729

730

731

732

733

734

735

736

737

738

739

740

741

742

743

744

745

746

747

748

749

750

751

752

753

754

755

756

757

758

759

760

761

762

763

764

765

766

767

768

769

770

771

772

773

774

775

776

777

778

779

780

781

782

783

784

785

786

787

788

789

790

791

792

793

794

795

796

797

798

799

800

801

802

803

804

805

806

807

808

809

810

811

812

813

814

815

816

817

818

819

820

821

822

823

824

825

826

827

828

829

830

831

832

833

834

835

836

837

838

839

840

841

842

843

844

845

846

847

848

849

850

851

852

853

854

855

856

857

858

859

860

861

862

863

864

865

866

867

868

869

870

871

872

873

874

875

876

877

878

879

880

881

882

883

884

885

886

887

888

889

890

891

892

893

894

895

896

897

898

899

900

901

902

using System;

using System.Net;

using System.Net.Sockets;

using System.Text;

using System.Threading.Tasks;

namespace NetCoreServer

{

/// <summary>

/// UDP client is used to read/write data from/into the connected UDP server

/// </summary>

/// <remarks>Thread-safe</remarks>

public class UdpClient : IDisposable

{

/// <summary>

/// Initialize UDP client with a given server IP address and port number

/// </summary>

/// <param name="address">IP address</param>

/// <param name="port">Port number</param>

public UdpClient(IPAddress address, int port) : this(new IPEndPoint(address, port)) {}

/// <summary>

/// Initialize UDP client with a given server IP address and port number

/// </summary>

/// <param name="address">IP address</param>

/// <param name="port">Port number</param>

public UdpClient(string address, int port) : this(new IPEndPoint(IPAddress.Parse(address), port)) {}

/// <summary>

/// Initialize UDP client with a given IP endpoint

/// </summary>

/// <param name="endpoint">IP endpoint</param>

public UdpClient(IPEndPoint endpoint)

{

Id = Guid.NewGuid();

Endpoint = endpoint;

}

/// <summary>

/// Client Id

/// </summary>

public Guid Id { get; }

/// <summary>

/// IP endpoint

/// </summary>

public IPEndPoint Endpoint { get; private set; }

/// <summary>

/// Socket

/// </summary>

public Socket Socket { get; private set; }

/// <summary>

/// Number of bytes pending sent by the client

/// </summary>

public long BytesPending { get; private set; }

/// <summary>

/// Number of bytes sending by the client

/// </summary>

public long BytesSending { get; private set; }

/// <summary>

/// Number of bytes sent by the client

/// </summary>

public long BytesSent { get; private set; }

/// <summary>

/// Number of bytes received by the client

/// </summary>

public long BytesReceived { get; private set; }

/// <summary>

/// Number of datagrams sent by the client

/// </summary>

public long DatagramsSent { get; private set; }

/// <summary>

/// Number of datagrams received by the client

/// </summary>

public long DatagramsReceived { get; private set; }

/// <summary>

/// Option: dual mode socket

/// </summary>

/// <remarks>

/// Specifies whether the Socket is a dual-mode socket used for both IPv4 and IPv6.

/// Will work only if socket is bound on IPv6 address.

/// </remarks>

public bool OptionDualMode { get; set; }

/// <summary>

/// Option: reuse address

/// </summary>

/// <remarks>

/// This option will enable/disable SO_REUSEADDR if the OS support this feature

/// </remarks>

public bool OptionReuseAddress { get; set; }

/// <summary>

/// Option: enables a socket to be bound for exclusive access

/// </summary>

/// <remarks>

/// This option will enable/disable SO_EXCLUSIVEADDRUSE if the OS support this feature

/// </remarks>

public bool OptionExclusiveAddressUse { get; set; }

/// <summary>

/// Option: bind the socket to the multicast UDP server

/// </summary>

public bool OptionMulticast { get; set; }

/// <summary>

/// Option: receive buffer limit

/// </summary>

public int OptionReceiveBufferLimit { get; set; } = 0;

/// <summary>

/// Option: receive buffer size

/// </summary>

public int OptionReceiveBufferSize { get; set; } = 8192;

/// <summary>

/// Option: send buffer limit

/// </summary>

public int OptionSendBufferLimit { get; set; } = 0;

/// <summary>

/// Option: send buffer size

/// </summary>

public int OptionSendBufferSize { get; set; } = 8192;

#region Connect/Disconnect client

/// <summary>

/// Is the client connected?

/// </summary>

public bool IsConnected { get; private set; }

/// <summary>

/// Create a new socket object

/// </summary>

/// <remarks>

/// Method may be override if you need to prepare some specific socket object in your implementation.

/// </remarks>

/// <returns>Socket object</returns>

protected virtual Socket CreateSocket()

{

return new Socket(Endpoint.AddressFamily, SocketType.Dgram, ProtocolType.Udp);

}

/// <summary>

/// Connect the client (synchronous)

/// </summary>

/// <returns>'true' if the client was successfully connected, 'false' if the client failed to connect</returns>

public virtual bool Connect()

{

if (IsConnected)

return false;

// Setup buffers

_receiveBuffer = new Buffer();

_sendBuffer = new Buffer();

// Setup event args

_receiveEventArg = new SocketAsyncEventArgs();

_receiveEventArg.Completed += OnAsyncCompleted;

_sendEventArg = new SocketAsyncEventArgs();

_sendEventArg.Completed += OnAsyncCompleted;

// Create a new client socket

Socket = CreateSocket();

// Update the client socket disposed flag

IsSocketDisposed = false;

// Apply the option: reuse address

Socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, OptionReuseAddress);

// Apply the option: exclusive address use

Socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ExclusiveAddressUse, OptionExclusiveAddressUse);

// Apply the option: dual mode (this option must be applied before recieving/sending)

if (Socket.AddressFamily == AddressFamily.InterNetworkV6)

Socket.DualMode = OptionDualMode;

// Call the client connecting handler

OnConnecting();

try

{

// Bind the acceptor socket to the IP endpoint

if (OptionMulticast)

Socket.Bind(Endpoint);

else

{

var endpoint = new IPEndPoint((Endpoint.AddressFamily == AddressFamily.InterNetworkV6) ? IPAddress.IPv6Any : IPAddress.Any, 0);

Socket.Bind(endpoint);

}

catch (SocketException ex)

{

// Call the client error handler

SendError(ex.SocketErrorCode);

// Reset event args

_receiveEventArg.Completed -= OnAsyncCompleted;

_sendEventArg.Completed -= OnAsyncCompleted;

// Call the client disconnecting handler

OnDisconnecting();

// Close the client socket

Socket.Close();

// Dispose the client socket

Socket.Dispose();

// Dispose event arguments

_receiveEventArg.Dispose();

_sendEventArg.Dispose();

// Call the client disconnected handler

OnDisconnected();

return false;

}

// Prepare receive endpoint

_receiveEndpoint = new IPEndPoint((Endpoint.AddressFamily == AddressFamily.InterNetworkV6) ? IPAddress.IPv6Any : IPAddress.Any, 0);

// Prepare receive & send buffers

_receiveBuffer.Reserve(OptionReceiveBufferSize);

// Reset statistic

BytesPending = 0;

BytesSending = 0;

BytesSent = 0;

BytesReceived = 0;

DatagramsSent = 0;

DatagramsReceived = 0;

// Update the connected flag

IsConnected = true;

// Call the client connected handler

OnConnected();

return true;

}

/// <summary>

/// Disconnect the client (synchronous)

/// </summary>

/// <returns>'true' if the client was successfully disconnected, 'false' if the client is already disconnected</returns>

public virtual bool Disconnect()

{

if (!IsConnected)

return false;

// Reset event args

_receiveEventArg.Completed -= OnAsyncCompleted;

_sendEventArg.Completed -= OnAsyncCompleted;

// Call the client disconnecting handler

OnDisconnecting();

try

{

// Close the client socket

Socket.Close();

// Dispose the client socket

Socket.Dispose();

// Dispose event arguments

_receiveEventArg.Dispose();

_sendEventArg.Dispose();

// Update the client socket disposed flag

IsSocketDisposed = true;

}

catch (ObjectDisposedException) {}

// Update the connected flag

IsConnected = false;

// Update sending/receiving flags

_receiving = false;

_sending = false;

// Clear send/receive buffers

ClearBuffers();

// Call the client disconnected handler

OnDisconnected();

return true;

}

/// <summary>

/// Reconnect the client (synchronous)

/// </summary>

/// <returns>'true' if the client was successfully reconnected, 'false' if the client is already reconnected</returns>

public virtual bool Reconnect()

{

if (!Disconnect())

return false;

return Connect();

}

#endregion

#region Multicast group

/// <summary>

/// Setup multicast: bind the socket to the multicast UDP server

/// </summary>

/// <param name="enable">Enable/disable multicast</param>

public virtual void SetupMulticast(bool enable)

{

OptionReuseAddress = enable;

OptionMulticast = enable;

}

/// <summary>

/// Join multicast group with a given IP address (synchronous)

/// </summary>

/// <param name="address">IP address</param>

public virtual void JoinMulticastGroup(IPAddress address)

{

if (Endpoint.AddressFamily == AddressFamily.InterNetworkV6)

Socket.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.AddMembership, new IPv6MulticastOption(address));

else

Socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(address));

// Call the client joined multicast group notification

OnJoinedMulticastGroup(address);

}

/// <summary>

/// Join multicast group with a given IP address (synchronous)

/// </summary>

/// <param name="address">IP address</param>

public virtual void JoinMulticastGroup(string address) { JoinMulticastGroup(IPAddress.Parse(address)); }

/// <summary>

/// Leave multicast group with a given IP address (synchronous)

/// </summary>

/// <param name="address">IP address</param>

public virtual void LeaveMulticastGroup(IPAddress address)

{

if (Endpoint.AddressFamily == AddressFamily.InterNetworkV6)

Socket.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.DropMembership, new IPv6MulticastOption(address));

else

Socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.DropMembership, new MulticastOption(address));

// Call the client left multicast group notification

OnLeftMulticastGroup(address);

}

/// <summary>

/// Leave multicast group with a given IP address (synchronous)

/// </summary>

/// <param name="address">IP address</param>

public virtual void LeaveMulticastGroup(string address) { LeaveMulticastGroup(IPAddress.Parse(address)); }

#endregion

#region Send/Recieve data

// Receive and send endpoints

EndPoint _receiveEndpoint;

EndPoint _sendEndpoint;

// Receive buffer

private bool _receiving;

private Buffer _receiveBuffer;

private SocketAsyncEventArgs _receiveEventArg;

// Send buffer

private bool _sending;

private Buffer _sendBuffer;

private SocketAsyncEventArgs _sendEventArg;

/// <summary>

/// Send datagram to the connected server (synchronous)

/// </summary>

/// <param name="buffer">Datagram buffer to send</param>

/// <returns>Size of sent datagram</returns>

public virtual long Send(byte[] buffer) { return Send(buffer, 0, buffer.Length); }

/// <summary>

/// Send datagram to the connected server (synchronous)

/// </summary>

/// <param name="buffer">Datagram buffer to send</param>

/// <param name="offset">Datagram buffer offset</param>

/// <param name="size">Datagram buffer size</param>

/// <returns>Size of sent datagram</returns>

public virtual long Send(byte[] buffer, long offset, long size) { return Send(Endpoint, buffer, offset, size); }

/// <summary>

/// Send text to the connected server (synchronous)

/// </summary>

/// <param name="text">Text string to send</param>

/// <returns>Size of sent datagram</returns>

public virtual long Send(string text) { return Send(Encoding.UTF8.GetBytes(text)); }

/// <summary>

/// Send datagram to the given endpoint (synchronous)

/// </summary>

/// <param name="endpoint">Endpoint to send</param>

/// <param name="buffer">Datagram buffer to send</param>

/// <returns>Size of sent datagram</returns>

public virtual long Send(EndPoint endpoint, byte[] buffer) { return Send(endpoint, buffer, 0, buffer.Length); }

/// <summary>

/// Send datagram to the given endpoint (synchronous)

/// </summary>

/// <param name="endpoint">Endpoint to send</param>

/// <param name="buffer">Datagram buffer to send</param>

/// <param name="offset">Datagram buffer offset</param>

/// <param name="size">Datagram buffer size</param>

/// <returns>Size of sent datagram</returns>

public virtual long Send(EndPoint endpoint, byte[] buffer, long offset, long size)

{

if (!IsConnected)

return 0;

if (size == 0)

return 0;

try

{

// Sent datagram to the server

int sent = Socket.SendTo(buffer, (int)offset, (int)size, SocketFlags.None, endpoint);

if (sent > 0)

{

// Update statistic

DatagramsSent++;

BytesSent += sent;

// Call the datagram sent handler

OnSent(endpoint, sent);

}

return sent;

}

catch (ObjectDisposedException) { return 0; }

catch (SocketException ex)

{

SendError(ex.SocketErrorCode);

Disconnect();

return 0;

}

/// <summary>

/// Send text to the given endpoint (synchronous)

/// </summary>

/// <param name="endpoint">Endpoint to send</param>

/// <param name="text">Text string to send</param>

/// <returns>Size of sent datagram</returns>

public virtual long Send(EndPoint endpoint, string text) { return Send(endpoint, Encoding.UTF8.GetBytes(text)); }

/// <summary>

/// Send datagram to the connected server (asynchronous)

/// </summary>

/// <param name="buffer">Datagram buffer to send</param>

/// <returns>'true' if the datagram was successfully sent, 'false' if the datagram was not sent</returns>

public virtual bool SendAsync(byte[] buffer) { return SendAsync(buffer, 0, buffer.Length); }

/// <summary>

/// Send datagram to the connected server (asynchronous)

/// </summary>

/// <param name="buffer">Datagram buffer to send</param>

/// <param name="offset">Datagram buffer offset</param>

/// <param name="size">Datagram buffer size</param>

/// <returns>'true' if the datagram was successfully sent, 'false' if the datagram was not sent</returns>

public virtual bool SendAsync(byte[] buffer, long offset, long size) { return SendAsync(Endpoint, buffer, offset, size); }

/// <summary>

/// Send text to the connected server (asynchronous)

/// </summary>

/// <param name="text">Text string to send</param>

/// <returns>'true' if the text was successfully sent, 'false' if the text was not sent</returns>

public virtual bool SendAsync(string text) { return SendAsync(Encoding.UTF8.GetBytes(text)); }

/// <summary>

/// Send datagram to the given endpoint (asynchronous)

/// </summary>

/// <param name="endpoint">Endpoint to send</param>

/// <param name="buffer">Datagram buffer to send</param>

/// <returns>'true' if the datagram was successfully sent, 'false' if the datagram was not sent</returns>

public virtual bool SendAsync(EndPoint endpoint, byte[] buffer) { return SendAsync(endpoint, buffer, 0, buffer.Length); }

/// <summary>

/// Send datagram to the given endpoint (asynchronous)

/// </summary>

/// <param name="endpoint">Endpoint to send</param>

/// <param name="buffer">Datagram buffer to send</param>

/// <param name="offset">Datagram buffer offset</param>

/// <param name="size">Datagram buffer size</param>

/// <returns>'true' if the datagram was successfully sent, 'false' if the datagram was not sent</returns>

public virtual bool SendAsync(EndPoint endpoint, byte[] buffer, long offset, long size)

{

if (_sending)

return false;

if (!IsConnected)

return false;

if (size == 0)

return true;

// Check the send buffer limit

if (((_sendBuffer.Size + size) > OptionSendBufferLimit) && (OptionSendBufferLimit > 0))

{

SendError(SocketError.NoBufferSpaceAvailable);

return false;

}

// Fill the main send buffer

_sendBuffer.Append(buffer, offset, size);

// Update statistic

BytesSending = _sendBuffer.Size;

// Update send endpoint

_sendEndpoint = endpoint;

// Try to send the main buffer

TrySend();

return true;

}

/// <summary>

/// Send text to the given endpoint (asynchronous)

/// </summary>

/// <param name="endpoint">Endpoint to send</param>

/// <param name="text">Text string to send</param>

/// <returns>'true' if the text was successfully sent, 'false' if the text was not sent</returns>

public virtual bool SendAsync(EndPoint endpoint, string text) { return SendAsync(endpoint, Encoding.UTF8.GetBytes(text)); }

/// <summary>

/// Receive a new datagram from the given endpoint (synchronous)

/// </summary>

/// <param name="endpoint">Endpoint to receive from</param>

/// <param name="buffer">Datagram buffer to receive</param>

/// <returns>Size of received datagram</returns>

public virtual long Receive(ref EndPoint endpoint, byte[] buffer) { return Receive(ref endpoint, buffer, 0, buffer.Length); }

/// <summary>

/// Receive a new datagram from the given endpoint (synchronous)

/// </summary>

/// <param name="endpoint">Endpoint to receive from</param>

/// <param name="buffer">Datagram buffer to receive</param>

/// <param name="offset">Datagram buffer offset</param>

/// <param name="size">Datagram buffer size</param>

/// <returns>Size of received datagram</returns>

public virtual long Receive(ref EndPoint endpoint, byte[] buffer, long offset, long size)

{

if (!IsConnected)

return 0;

if (size == 0)

return 0;

try

{

// Receive datagram from the server

int received = Socket.ReceiveFrom(buffer, (int)offset, (int)size, SocketFlags.None, ref endpoint);

// Update statistic

DatagramsReceived++;

BytesReceived += received;

// Call the datagram received handler

OnReceived(endpoint, buffer, offset, size);

return received;

}

catch (ObjectDisposedException) { return 0; }

catch (SocketException ex)

{

SendError(ex.SocketErrorCode);

Disconnect();

return 0;

}

/// <summary>

/// Receive text from the given endpoint (synchronous)

/// </summary>

/// <param name="endpoint">Endpoint to receive from</param>

/// <param name="size">Text size to receive</param>

/// <returns>Received text</returns>

public virtual string Receive(ref EndPoint endpoint, long size)

{

var buffer = new byte[size];

var length = Receive(ref endpoint, buffer);

return Encoding.UTF8.GetString(buffer, 0, (int)length);

}

/// <summary>

/// Receive datagram from the server (asynchronous)

/// </summary>

public virtual void ReceiveAsync()

{

// Try to receive datagram

TryReceive();

}

/// <summary>

/// Try to receive new data

/// </summary>

private void TryReceive()

{

if (_receiving)

return;

if (!IsConnected)

return;

try

{

// Async receive with the receive handler

_receiving = true;

_receiveEventArg.RemoteEndPoint = _receiveEndpoint;

_receiveEventArg.SetBuffer(_receiveBuffer.Data, 0, (int)_receiveBuffer.Capacity);

if (!Socket.ReceiveFromAsync(_receiveEventArg))

ProcessReceiveFrom(_receiveEventArg);

}

catch (ObjectDisposedException) {}

}

/// <summary>

/// Try to send pending data

/// </summary>

private void TrySend()

{

if (_sending)

return;

if (!IsConnected)

return;

try

{

// Async write with the write handler

_sending = true;

_sendEventArg.RemoteEndPoint = _sendEndpoint;

_sendEventArg.SetBuffer(_sendBuffer.Data, 0, (int)(_sendBuffer.Size));

if (!Socket.SendToAsync(_sendEventArg))

ProcessSendTo(_sendEventArg);

}

catch (ObjectDisposedException) {}

}

/// <summary>

/// Clear send/receive buffers

/// </summary>

private void ClearBuffers()

{

// Clear send buffers

_sendBuffer.Clear();

// Update statistic

BytesPending = 0;

BytesSending = 0;

}

#endregion

#region IO processing

/// <summary>

/// This method is called whenever a receive or send operation is completed on a socket

/// </summary>

private void OnAsyncCompleted(object sender, SocketAsyncEventArgs e)

{

if (IsSocketDisposed)

return;

// Determine which type of operation just completed and call the associated handler

switch (e.LastOperation)

{

case SocketAsyncOperation.ReceiveFrom:

ProcessReceiveFrom(e);

break;

case SocketAsyncOperation.SendTo:

ProcessSendTo(e);

break;

default:

throw new ArgumentException("The last operation completed on the socket was not a receive or send");

}

/// <summary>

/// This method is invoked when an asynchronous receive from operation completes

/// </summary>

private void ProcessReceiveFrom(SocketAsyncEventArgs e)

{

_receiving = false;

if (!IsConnected)

return;

// Disconnect on error

if (e.SocketError != SocketError.Success)

{

SendError(e.SocketError);

Disconnect();

return;

}

// Received some data from the server

long size = e.BytesTransferred;

// Update statistic

DatagramsReceived++;

BytesReceived += size;

// Call the datagram received handler

OnReceived(e.RemoteEndPoint, _receiveBuffer.Data, 0, size);

// If the receive buffer is full increase its size

if (_receiveBuffer.Capacity == size)

{

// Check the receive buffer limit

if (((2 * size) > OptionReceiveBufferLimit) && (OptionReceiveBufferLimit > 0))

{

SendError(SocketError.NoBufferSpaceAvailable);

Disconnect();

return;

}

_receiveBuffer.Reserve(2 * size);

}

/// <summary>

/// This method is invoked when an asynchronous send to operation completes

/// </summary>

private void ProcessSendTo(SocketAsyncEventArgs e)

{

_sending = false;

if (!IsConnected)

return;

// Disconnect on error

if (e.SocketError != SocketError.Success)

{

SendError(e.SocketError);

Disconnect();

return;

}

long sent = e.BytesTransferred;

// Send some data to the server

if (sent > 0)

{

// Update statistic

BytesSending = 0;

BytesSent += sent;

// Clear the send buffer

_sendBuffer.Clear();

// Call the buffer sent handler

OnSent(_sendEndpoint, sent);

}

#endregion

#region Session handlers

/// <summary>

/// Handle client connecting notification

/// </summary>

protected virtual void OnConnecting() {}

/// <summary>

/// Handle client connected notification

/// </summary>

protected virtual void OnConnected() {}

/// <summary>

/// Handle client disconnecting notification

/// </summary>

protected virtual void OnDisconnecting() {}

/// <summary>

/// Handle client disconnected notification

/// </summary>

protected virtual void OnDisconnected() {}

/// <summary>

/// Handle client joined multicast group notification

/// </summary>

/// <param name="address">IP address</param>

protected virtual void OnJoinedMulticastGroup(IPAddress address) {}

/// <summary>

/// Handle client left multicast group notification

/// </summary>

/// <param name="address">IP address</param>

protected virtual void OnLeftMulticastGroup(IPAddress address) {}

/// <summary>

/// Handle datagram received notification

/// </summary>

/// <param name="endpoint">Received endpoint</param>

/// <param name="buffer">Received datagram buffer</param>

/// <param name="offset">Received datagram buffer offset</param>

/// <param name="size">Received datagram buffer size</param>

/// <remarks>

/// Notification is called when another datagram was received from some endpoint

/// </remarks>

protected virtual void OnReceived(EndPoint endpoint, byte[] buffer, long offset, long size) {}

/// <summary>

/// Handle datagram sent notification

/// </summary>

/// <param name="endpoint">Endpoint of sent datagram</param>

/// <param name="sent">Size of sent datagram buffer</param>

/// <remarks>

/// Notification is called when a datagram was sent to the server.

/// This handler could be used to send another datagram to the server for instance when the pending size is zero.

/// </remarks>

protected virtual void OnSent(EndPoint endpoint, long sent) {}

/// <summary>

/// Handle error notification

/// </summary>

/// <param name="error">Socket error code</param>

protected virtual void OnError(SocketError error) {}

#endregion

#region Error handling

/// <summary>

/// Send error notification

/// </summary>

/// <param name="error">Socket error code</param>

private void SendError(SocketError error)

{

// Skip disconnect errors

if ((error == SocketError.ConnectionAborted) ||

(error == SocketError.ConnectionRefused) ||

(error == SocketError.ConnectionReset) ||

(error == SocketError.OperationAborted) ||

(error == SocketError.Shutdown))

return;

OnError(error);

}

#endregion

#region IDisposable implementation

/// <summary>

/// Disposed flag

/// </summary>

public bool IsDisposed { get; private set; }

/// <summary>

/// Client socket disposed flag

/// </summary>

public bool IsSocketDisposed { get; private set; } = true;

// Implement IDisposable.

public void Dispose()

{

Dispose(true);

GC.SuppressFinalize(this);

}

protected virtual void Dispose(bool disposingManagedResources)

{

// The idea here is that Dispose(Boolean) knows whether it is

// being called to do explicit cleanup (the Boolean is true)

// versus being called due to a garbage collection (the Boolean

// is false). This distinction is useful because, when being

// disposed explicitly, the Dispose(Boolean) method can safely

// execute code using reference type fields that refer to other

// objects knowing for sure that these other objects have not been

// finalized or disposed of yet. When the Boolean is false,

// the Dispose(Boolean) method should not execute code that

// refer to reference type fields because those objects may

// have already been finalized."

if (!IsDisposed)

{

if (disposingManagedResources)

{

// Dispose managed resources here...

Disconnect();

}

// Dispose unmanaged resources here...

// Set large fields to null here...

// Mark as disposed.

IsDisposed = true;

}

// Use C# destructor syntax for finalization code.

~UdpClient()

{

// Simply call Dispose(false).

Dispose(false);

}

#endregion

}

NetCoreServer/source/NetCoreServer/UdpClient.cs at master · bubdm/NetCoreServer · GitHub

Repository navigation

Expand file tree

Breadcrumbs

UdpClient.cs

Latest commit

History

Breadcrumbs

UdpClient.cs

File metadata and controls