NetCoreServer/source/NetCoreServer/UdsServer.cs at master · DeepenKernel/NetCoreServer · GitHub

Repository navigation

History

519 lines (429 loc) · 17 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

using System;

using System.Collections.Concurrent;

using System.Diagnostics;

using System.Net;

using System.Net.Sockets;

using System.Text;

using System.Threading;

namespace NetCoreServer

{

/// <summary>

/// Unix Domain Socket server is used to connect, disconnect and manage Unix Domain Socket sessions

/// </summary>

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

public class UdsServer : IDisposable

{

/// <summary>

/// Initialize Unix Domain Socket server with a given socket path

/// </summary>

/// <param name="path">Socket path</param>

public UdsServer(string path) : this(new UnixDomainSocketEndPoint(path)) {}

/// <summary>

/// Initialize Unix Domain Socket server with a given Unix Domain Socket endpoint

/// </summary>

/// <param name="endpoint">Unix Domain Socket endpoint</param>

public UdsServer(UnixDomainSocketEndPoint endpoint)

{

Id = Guid.NewGuid();

Endpoint = endpoint;

}

/// <summary>

/// Server Id

/// </summary>

public Guid Id { get; }

/// <summary>

/// Endpoint

/// </summary>

public EndPoint Endpoint { get; private set; }

/// <summary>

/// Number of sessions connected to the server

/// </summary>

public long ConnectedSessions { get { return Sessions.Count; } }

/// <summary>

/// Number of bytes pending sent by the server

/// </summary>

public long BytesPending { get { return _bytesPending; } }

/// <summary>

/// Number of bytes sent by the server

/// </summary>

public long BytesSent { get { return _bytesSent; } }

/// <summary>

/// Number of bytes received by the server

/// </summary>

public long BytesReceived { get { return _bytesReceived; } }

/// <summary>

/// Option: acceptor backlog size

/// </summary>

/// <remarks>

/// This option will set the listening socket's backlog size

/// </remarks>

public int OptionAcceptorBacklog { get; set; } = 1024;

/// <summary>

/// Option: receive buffer size

/// </summary>

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

/// <summary>

/// Option: send buffer size

/// </summary>

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

#region Start/Stop server

// Server acceptor

private Socket _acceptorSocket;

private SocketAsyncEventArgs _acceptorEventArg;

// Server statistic

internal long _bytesPending;

internal long _bytesSent;

internal long _bytesReceived;

/// <summary>

/// Is the server started?

/// </summary>

public bool IsStarted { get; private set; }

/// <summary>

/// Is the server accepting new clients?

/// </summary>

public bool IsAccepting { 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.Stream, ProtocolType.IP);

}

/// <summary>

/// Start the server

/// </summary>

/// <returns>'true' if the server was successfully started, 'false' if the server failed to start</returns>

public virtual bool Start()

{

Debug.Assert(!IsStarted, "Unix Domain Socket server is already started!");

if (IsStarted)

return false;

// Setup acceptor event arg

_acceptorEventArg = new SocketAsyncEventArgs();

_acceptorEventArg.Completed += OnAsyncCompleted;

// Create a new acceptor socket

_acceptorSocket = CreateSocket();

// Update the acceptor socket disposed flag

IsSocketDisposed = false;

// Bind the acceptor socket to the endpoint

_acceptorSocket.Bind(Endpoint);

// Refresh the endpoint property based on the actual endpoint created

Endpoint = _acceptorSocket.LocalEndPoint;

// Call the server starting handler

OnStarting();

// Start listen to the acceptor socket with the given accepting backlog size

_acceptorSocket.Listen(OptionAcceptorBacklog);

// Reset statistic

_bytesPending = 0;

_bytesSent = 0;

_bytesReceived = 0;

// Update the started flag

IsStarted = true;

// Call the server started handler

OnStarted();

// Perform the first server accept

IsAccepting = true;

StartAccept(_acceptorEventArg);

return true;

}

/// <summary>

/// Stop the server

/// </summary>

/// <returns>'true' if the server was successfully stopped, 'false' if the server is already stopped</returns>

public virtual bool Stop()

{

Debug.Assert(IsStarted, "Unix Domain Socket server is not started!");

if (!IsStarted)

return false;

// Stop accepting new clients

IsAccepting = false;

// Reset acceptor event arg

_acceptorEventArg.Completed -= OnAsyncCompleted;

// Call the server stopping handler

OnStopping();

try

{

// Close the acceptor socket

_acceptorSocket.Close();

// Dispose the acceptor socket

_acceptorSocket.Dispose();

// Dispose event arguments

_acceptorEventArg.Dispose();

// Update the acceptor socket disposed flag

IsSocketDisposed = true;

}

catch (ObjectDisposedException) {}

// Disconnect all sessions

DisconnectAll();

// Update the started flag

IsStarted = false;

// Call the server stopped handler

OnStopped();

return true;

}

/// <summary>

/// Restart the server

/// </summary>

/// <returns>'true' if the server was successfully restarted, 'false' if the server failed to restart</returns>

public virtual bool Restart()

{

if (!Stop())

return false;

while (IsStarted)

Thread.Yield();

return Start();

}

#endregion

#region Accepting clients

/// <summary>

/// Start accept a new client connection

/// </summary>

private void StartAccept(SocketAsyncEventArgs e)

{

// Socket must be cleared since the context object is being reused

e.AcceptSocket = null;

// Async accept a new client connection

if (!_acceptorSocket.AcceptAsync(e))

ProcessAccept(e);

}

/// <summary>

/// Process accepted client connection

/// </summary>

private void ProcessAccept(SocketAsyncEventArgs e)

{

if (e.SocketError == SocketError.Success)

{

// Create a new session to register

var session = CreateSession();

// Register the session

RegisterSession(session);

// Connect new session

session.Connect(e.AcceptSocket);

}

else

SendError(e.SocketError);

// Accept the next client connection

if (IsAccepting)

StartAccept(e);

}

/// <summary>

/// This method is the callback method associated with Socket.AcceptAsync()

/// operations and is invoked when an accept operation is complete

/// </summary>

private void OnAsyncCompleted(object sender, SocketAsyncEventArgs e)

{

if (IsSocketDisposed)

return;

ProcessAccept(e);

}

#endregion

#region Session factory

/// <summary>

/// Create Unix Domain Socket session factory method

/// </summary>

/// <returns>Unix Domain Socket session</returns>

protected virtual UdsSession CreateSession() { return new UdsSession(this); }

#endregion

#region Session management

/// <summary>

/// Server sessions

/// </summary>

protected readonly ConcurrentDictionary<Guid, UdsSession> Sessions = new ConcurrentDictionary<Guid, UdsSession>();

/// <summary>

/// Disconnect all connected sessions

/// </summary>

/// <returns>'true' if all sessions were successfully disconnected, 'false' if the server is not started</returns>

public virtual bool DisconnectAll()

{

if (!IsStarted)

return false;

// Disconnect all sessions

foreach (var session in Sessions.Values)

session.Disconnect();

return true;

}

/// <summary>

/// Find a session with a given Id

/// </summary>

/// <param name="id">Session Id</param>

/// <returns>Session with a given Id or null if the session it not connected</returns>

public UdsSession FindSession(Guid id)

{

// Try to find the required session

return Sessions.TryGetValue(id, out UdsSession result) ? result : null;

}

/// <summary>

/// Register a new session

/// </summary>

/// <param name="session">Session to register</param>

internal void RegisterSession(UdsSession session)

{

// Register a new session

Sessions.TryAdd(session.Id, session);

}

/// <summary>

/// Unregister session by Id

/// </summary>

/// <param name="id">Session Id</param>

internal void UnregisterSession(Guid id)

{

// Unregister session by Id

Sessions.TryRemove(id, out UdsSession _);

}

#endregion

#region Multicasting

/// <summary>

/// Multicast data to all connected sessions

/// </summary>

/// <param name="buffer">Buffer to multicast</param>

/// <returns>'true' if the data was successfully multicasted, 'false' if the data was not multicasted</returns>

public virtual bool Multicast(byte[] buffer) => Multicast(buffer.AsSpan());

/// <summary>

/// Multicast data to all connected clients

/// </summary>

/// <param name="buffer">Buffer to multicast</param>

/// <param name="offset">Buffer offset</param>

/// <param name="size">Buffer size</param>

/// <returns>'true' if the data was successfully multicasted, 'false' if the data was not multicasted</returns>

public virtual bool Multicast(byte[] buffer, long offset, long size) => Multicast(buffer.AsSpan((int)offset, (int)size));

/// <summary>

/// Multicast data to all connected clients

/// </summary>

/// <param name="buffer">Buffer to send as a span of bytes</param>

/// <returns>'true' if the data was successfully multicasted, 'false' if the data was not multicasted</returns>

public virtual bool Multicast(ReadOnlySpan<byte> buffer)

{

if (!IsStarted)

return false;

if (buffer.IsEmpty)

return true;

// Multicast data to all sessions

foreach (var session in Sessions.Values)

session.SendAsync(buffer);

return true;

}

/// <summary>

/// Multicast text to all connected clients

/// </summary>

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

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

public virtual bool Multicast(string text) => Multicast(Encoding.UTF8.GetBytes(text));

/// <summary>

/// Multicast text to all connected clients

/// </summary>

/// <param name="text">Text to multicast as a span of characters</param>

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

public virtual bool Multicast(ReadOnlySpan<char> text) => Multicast(Encoding.UTF8.GetBytes(text.ToArray()));

#endregion

#region Server handlers

/// <summary>

/// Handle server starting notification

/// </summary>

protected virtual void OnStarting() {}

/// <summary>

/// Handle server started notification

/// </summary>

protected virtual void OnStarted() {}

/// <summary>

/// Handle server stopping notification

/// </summary>

protected virtual void OnStopping() {}

/// <summary>

/// Handle server stopped notification

/// </summary>

protected virtual void OnStopped() {}

/// <summary>

/// Handle session connecting notification

/// </summary>

/// <param name="session">Connecting session</param>

protected virtual void OnConnecting(UdsSession session) {}

/// <summary>

/// Handle session connected notification

/// </summary>

/// <param name="session">Connected session</param>

protected virtual void OnConnected(UdsSession session) {}

/// <summary>

/// Handle session disconnecting notification

/// </summary>

/// <param name="session">Disconnecting session</param>

protected virtual void OnDisconnecting(UdsSession session) {}

/// <summary>

/// Handle session disconnected notification

/// </summary>

/// <param name="session">Disconnected session</param>

protected virtual void OnDisconnected(UdsSession session) {}

/// <summary>

/// Handle error notification

/// </summary>

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

protected virtual void OnError(SocketError error) {}

internal void OnConnectingInternal(UdsSession session) { OnConnecting(session); }

internal void OnConnectedInternal(UdsSession session) { OnConnected(session); }

internal void OnDisconnectingInternal(UdsSession session) { OnDisconnecting(session); }

internal void OnDisconnectedInternal(UdsSession session) { OnDisconnected(session); }

#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>

/// Acceptor 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...

Stop();

}

// Dispose unmanaged resources here...

// Set large fields to null here...

// Mark as disposed.

IsDisposed = true;

}

#endregion

}

NetCoreServer/source/NetCoreServer/UdsServer.cs at master · DeepenKernel/NetCoreServer · GitHub

Repository navigation

Expand file tree

Breadcrumbs

UdsServer.cs

Latest commit

History

Breadcrumbs

UdsServer.cs

File metadata and controls