cloudstack/agent/src/com/cloud/agent/Agent.java at master · cloudmonger/cloudstack · GitHub

History

878 lines (760 loc) · 32.9 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

// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements. See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership. The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License. You may obtain a copy of the License at

// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied. See the License for the

// specific language governing permissions and limitations

// under the License.

package com.cloud.agent;

import java.io.IOException;

import java.io.PrintWriter;

import java.io.StringWriter;

import java.net.InetAddress;

import java.net.UnknownHostException;

import java.nio.channels.ClosedChannelException;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import java.util.Timer;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.LinkedBlockingQueue;

import java.util.concurrent.SynchronousQueue;

import java.util.concurrent.ThreadPoolExecutor;

import java.util.concurrent.TimeUnit;

import java.util.concurrent.atomic.AtomicInteger;

import javax.naming.ConfigurationException;

import org.apache.cloudstack.managed.context.ManagedContextTimerTask;

import org.apache.log4j.Logger;

import org.slf4j.MDC;

import com.cloud.agent.api.AgentControlAnswer;

import com.cloud.agent.api.AgentControlCommand;

import com.cloud.agent.api.Answer;

import com.cloud.agent.api.Command;

import com.cloud.agent.api.CronCommand;

import com.cloud.agent.api.MaintainAnswer;

import com.cloud.agent.api.MaintainCommand;

import com.cloud.agent.api.PingCommand;

import com.cloud.agent.api.ReadyCommand;

import com.cloud.agent.api.ShutdownCommand;

import com.cloud.agent.api.StartupAnswer;

import com.cloud.agent.api.StartupCommand;

import com.cloud.agent.transport.Request;

import com.cloud.agent.transport.Response;

import com.cloud.exception.AgentControlChannelException;

import com.cloud.resource.ServerResource;

import com.cloud.utils.PropertiesUtil;

import com.cloud.utils.backoff.BackoffAlgorithm;

import com.cloud.utils.concurrency.NamedThreadFactory;

import com.cloud.utils.exception.CloudRuntimeException;

import com.cloud.utils.exception.NioConnectionException;

import com.cloud.utils.exception.TaskExecutionException;

import com.cloud.utils.nio.HandlerFactory;

import com.cloud.utils.nio.Link;

import com.cloud.utils.nio.NioClient;

import com.cloud.utils.nio.NioConnection;

import com.cloud.utils.nio.Task;

import com.cloud.utils.script.OutputInterpreter;

import com.cloud.utils.script.Script;

/**

* @config

* {@table

* || Param Name | Description | Values | Default ||

* || type | Type of server | Storage / Computing / Routing | No Default ||

* || workers | # of workers to process the requests | int | 1 ||

* || host | host to connect to | ip address | localhost ||

* || port | port to connect to | port number | 8250 ||

* || instance | Used to allow multiple agents running on the same host | String | none || * }

* For more configuration options, see the individual types.

**/

public class Agent implements HandlerFactory, IAgentControl {

private static final Logger s_logger = Logger.getLogger(Agent.class.getName());

public enum ExitStatus {

Normal(0), // Normal status = 0.

Upgrade(65), // Exiting for upgrade.

Configuration(66), // Exiting due to configuration problems.

Error(67); // Exiting because of error.

int value;

ExitStatus(final int value) {

this.value = value;

}

public int value() {

return value;

}

List<IAgentControlListener> _controlListeners = new ArrayList<IAgentControlListener>();

IAgentShell _shell;

NioConnection _connection;

ServerResource _resource;

Link _link;

Long _id;

Timer _timer = new Timer("Agent Timer");

List<WatchTask> _watchList = new ArrayList<WatchTask>();

long _sequence = 0;

long _lastPingResponseTime = 0;

long _pingInterval = 0;

AtomicInteger _inProgress = new AtomicInteger();

StartupTask _startup = null;

long _startupWaitDefault = 180000;

long _startupWait = _startupWaitDefault;

boolean _reconnectAllowed = true;

//For time sentitive task, e.g. PingTask

private final ThreadPoolExecutor _ugentTaskPool;

ExecutorService _executor;

// for simulator use only

public Agent(final IAgentShell shell) {

_shell = shell;

_link = null;

_connection = new NioClient("Agent", _shell.getHost(), _shell.getPort(), _shell.getWorkers(), this);

Runtime.getRuntime().addShutdownHook(new ShutdownThread(this));

_ugentTaskPool =

new ThreadPoolExecutor(shell.getPingRetries(), 2 * shell.getPingRetries(), 10, TimeUnit.MINUTES, new SynchronousQueue<Runnable>(), new NamedThreadFactory(

"UgentTask"));

_executor =

new ThreadPoolExecutor(_shell.getWorkers(), 5 * _shell.getWorkers(), 1, TimeUnit.DAYS, new LinkedBlockingQueue<Runnable>(), new NamedThreadFactory(

"agentRequest-Handler"));

}

public Agent(final IAgentShell shell, final int localAgentId, final ServerResource resource) throws ConfigurationException {

_shell = shell;

_resource = resource;

_link = null;

resource.setAgentControl(this);

final String value = _shell.getPersistentProperty(getResourceName(), "id");

_id = value != null ? Long.parseLong(value) : null;

s_logger.info("id is " + (_id != null ? _id : ""));

final Map<String, Object> params = PropertiesUtil.toMap(_shell.getProperties());

// merge with properties from command line to let resource access command line parameters

for (final Map.Entry<String, Object> cmdLineProp : _shell.getCmdLineProperties().entrySet()) {

params.put(cmdLineProp.getKey(), cmdLineProp.getValue());

}

if (!_resource.configure(getResourceName(), params)) {

throw new ConfigurationException("Unable to configure " + _resource.getName());

}

_connection = new NioClient("Agent", _shell.getHost(), _shell.getPort(), _shell.getWorkers(), this);

// ((NioClient)_connection).setBindAddress(_shell.getPrivateIp());

s_logger.debug("Adding shutdown hook");

Runtime.getRuntime().addShutdownHook(new ShutdownThread(this));

_ugentTaskPool =

new ThreadPoolExecutor(shell.getPingRetries(), 2 * shell.getPingRetries(), 10, TimeUnit.MINUTES, new SynchronousQueue<Runnable>(), new NamedThreadFactory(

"UgentTask"));

_executor =

new ThreadPoolExecutor(_shell.getWorkers(), 5 * _shell.getWorkers(), 1, TimeUnit.DAYS, new LinkedBlockingQueue<Runnable>(), new NamedThreadFactory(

"agentRequest-Handler"));

s_logger.info("Agent [id = " + (_id != null ? _id : "new") + " : type = " + getResourceName() + " : zone = " + _shell.getZone() + " : pod = " + _shell.getPod() +

" : workers = " + _shell.getWorkers() + " : host = " + _shell.getHost() + " : port = " + _shell.getPort());

}

public String getVersion() {

return _shell.getVersion();

}

public String getResourceGuid() {

final String guid = _shell.getGuid();

return guid + "-" + getResourceName();

}

public String getZone() {

return _shell.getZone();

}

public String getPod() {

return _shell.getPod();

}

protected void setLink(final Link link) {

_link = link;

}

public ServerResource getResource() {

return _resource;

}

public BackoffAlgorithm getBackoffAlgorithm() {

return _shell.getBackoffAlgorithm();

}

public String getResourceName() {

return _resource.getClass().getSimpleName();

}

public void start() {

if (!_resource.start()) {

s_logger.error("Unable to start the resource: " + _resource.getName());

throw new CloudRuntimeException("Unable to start the resource: " + _resource.getName());

}

try {

_connection.start();

} catch (final NioConnectionException e) {

s_logger.warn("NIO Connection Exception " + e);

s_logger.info("Attempted to connect to the server, but received an unexpected exception, trying again...");

}

while (!_connection.isStartup()) {

_shell.getBackoffAlgorithm().waitBeforeRetry();

_connection = new NioClient("Agent", _shell.getHost(), _shell.getPort(), _shell.getWorkers(), this);

try {

_connection.start();

} catch (final NioConnectionException e) {

s_logger.warn("NIO Connection Exception " + e);

s_logger.info("Attempted to connect to the server, but received an unexpected exception, trying again...");

}

public void stop(final String reason, final String detail) {

s_logger.info("Stopping the agent: Reason = " + reason + (detail != null ? ": Detail = " + detail : ""));

if (_connection != null) {

final ShutdownCommand cmd = new ShutdownCommand(reason, detail);

try {

if (_link != null) {

final Request req = new Request(_id != null ? _id : -1, -1, cmd, false);

_link.send(req.toBytes());

}

} catch (final ClosedChannelException e) {

s_logger.warn("Unable to send: " + cmd.toString());

} catch (final Exception e) {

s_logger.warn("Unable to send: " + cmd.toString() + " due to exception: ", e);

}

s_logger.debug("Sending shutdown to management server");

try {

Thread.sleep(1000);

} catch (final InterruptedException e) {

s_logger.debug("Who the heck interrupted me here?");

}

_connection.stop();

_connection = null;

}

if (_resource != null) {

_resource.stop();

_resource = null;

}

_ugentTaskPool.shutdownNow();

}

public Long getId() {

return _id;

}

public void setId(final Long id) {

s_logger.info("Set agent id " + id);

_id = id;

_shell.setPersistentProperty(getResourceName(), "id", Long.toString(id));

}

public void scheduleWatch(final Link link, final Request request, final long delay, final long period) {

synchronized (_watchList) {

if (s_logger.isDebugEnabled()) {

s_logger.debug("Adding a watch list");

}

final WatchTask task = new WatchTask(link, request, this);

_timer.schedule(task, 0, period);

_watchList.add(task);

}

protected void cancelTasks() {

synchronized (_watchList) {

for (final WatchTask task : _watchList) {

task.cancel();

}

if (s_logger.isDebugEnabled()) {

s_logger.debug("Clearing watch list: " + _watchList.size());

}

_watchList.clear();

}

public synchronized void lockStartupTask(final Link link)

{

_startup = new StartupTask(link);

_timer.schedule(_startup, _startupWait);

}

public void sendStartup(final Link link) {

final StartupCommand[] startup = _resource.initialize();

if (startup != null) {

final Command[] commands = new Command[startup.length];

for (int i = 0; i < startup.length; i++) {

setupStartupCommand(startup[i]);

commands[i] = startup[i];

}

final Request request = new Request(_id != null ? _id : -1, -1, commands, false, false);

request.setSequence(getNextSequence());

if (s_logger.isDebugEnabled()) {

s_logger.debug("Sending Startup: " + request.toString());

}

lockStartupTask(link);

try {

link.send(request.toBytes());

} catch (final ClosedChannelException e) {

s_logger.warn("Unable to send reques: " + request.toString());

}

protected void setupStartupCommand(final StartupCommand startup) {

InetAddress addr;

try {

addr = InetAddress.getLocalHost();

} catch (final UnknownHostException e) {

s_logger.warn("unknow host? ", e);

throw new CloudRuntimeException("Cannot get local IP address");

}

final Script command = new Script("hostname", 500, s_logger);

final OutputInterpreter.OneLineParser parser = new OutputInterpreter.OneLineParser();

final String result = command.execute(parser);

final String hostname = result == null ? parser.getLine() : addr.toString();

startup.setId(getId());

if (startup.getName() == null) {

startup.setName(hostname);

}

startup.setDataCenter(getZone());

startup.setPod(getPod());

startup.setGuid(getResourceGuid());

startup.setResourceName(getResourceName());

startup.setVersion(getVersion());

}

@Override

public Task create(final Task.Type type, final Link link, final byte[] data) {

return new ServerHandler(type, link, data);

}

protected void reconnect(final Link link) {

if (!_reconnectAllowed) {

return;

}

synchronized (this) {

if (_startup != null) {

_startup.cancel();

_startup = null;

}

link.close();

link.terminated();

setLink(null);

cancelTasks();

_resource.disconnected();

int inProgress = 0;

do {

_shell.getBackoffAlgorithm().waitBeforeRetry();

s_logger.info("Lost connection to the server. Dealing with the remaining commands...");

inProgress = _inProgress.get();

if (inProgress > 0) {

s_logger.info("Cannot connect because we still have " + inProgress + " commands in progress.");

}

} while (inProgress > 0);

_connection.stop();

try {

_connection.cleanUp();

} catch (final IOException e) {

s_logger.warn("Fail to clean up old connection. " + e);

}

while (_connection.isStartup()) {

_shell.getBackoffAlgorithm().waitBeforeRetry();

}

_connection = new NioClient("Agent", _shell.getHost(), _shell.getPort(), _shell.getWorkers(), this);

do {

s_logger.info("Reconnecting...");

try {

_connection.start();

} catch (final NioConnectionException e) {

s_logger.warn("NIO Connection Exception " + e);

s_logger.info("Attempted to connect to the server, but received an unexpected exception, trying again...");

}

_shell.getBackoffAlgorithm().waitBeforeRetry();

} while (!_connection.isStartup());

s_logger.info("Connected to the server");

}

public void processStartupAnswer(final Answer answer, final Response response, final Link link) {

boolean cancelled = false;

synchronized (this) {

if (_startup != null) {

_startup.cancel();

_startup = null;

} else {

cancelled = true;

}

final StartupAnswer startup = (StartupAnswer)answer;

if (!startup.getResult()) {

s_logger.error("Not allowed to connect to the server: " + answer.getDetails());

System.exit(1);

}

if (cancelled) {

s_logger.warn("Threw away a startup answer because we're reconnecting.");

return;

}

s_logger.info("Proccess agent startup answer, agent id = " + startup.getHostId());

setId(startup.getHostId());

_pingInterval = (long)startup.getPingInterval() * 1000; // change to ms.

setLastPingResponseTime();

scheduleWatch(link, response, _pingInterval, _pingInterval);

_ugentTaskPool.setKeepAliveTime(2 * _pingInterval, TimeUnit.MILLISECONDS);

s_logger.info("Startup Response Received: agent id = " + getId());

}

protected void processRequest(final Request request, final Link link) {

boolean requestLogged = false;

Response response = null;

try {

final Command[] cmds = request.getCommands();

final Answer[] answers = new Answer[cmds.length];

for (int i = 0; i < cmds.length; i++) {

final Command cmd = cmds[i];

Answer answer;

try {

if (cmd.getContextParam("logid") != null) {

MDC.put("logcontextid", cmd.getContextParam("logid"));

}

if (s_logger.isDebugEnabled()) {

if (!requestLogged) // ensures request is logged only once per method call

{

final String requestMsg = request.toString();

if (requestMsg != null) {

s_logger.debug("Request:" + requestMsg);

}

requestLogged = true;

}

s_logger.debug("Processing command: " + cmd.toString());

}

if (cmd instanceof CronCommand) {

final CronCommand watch = (CronCommand)cmd;

scheduleWatch(link, request, (long)watch.getInterval() * 1000, watch.getInterval() * 1000);

answer = new Answer(cmd, true, null);

} else if (cmd instanceof ShutdownCommand) {

final ShutdownCommand shutdown = (ShutdownCommand)cmd;

s_logger.debug("Received shutdownCommand, due to: " + shutdown.getReason());

cancelTasks();

_reconnectAllowed = false;

answer = new Answer(cmd, true, null);

} else if (cmd instanceof ReadyCommand && ((ReadyCommand)cmd).getDetails() != null) {

s_logger.debug("Not ready to connect to mgt server: " + ((ReadyCommand)cmd).getDetails());

System.exit(1);

return;

} else if (cmd instanceof MaintainCommand) {

s_logger.debug("Received maintainCommand");

cancelTasks();

_reconnectAllowed = false;

answer = new MaintainAnswer((MaintainCommand)cmd);

} else if (cmd instanceof AgentControlCommand) {

answer = null;

synchronized (_controlListeners) {

for (final IAgentControlListener listener : _controlListeners) {

answer = listener.processControlRequest(request, (AgentControlCommand)cmd);

if (answer != null) {

break;

}

if (answer == null) {

s_logger.warn("No handler found to process cmd: " + cmd.toString());

answer = new AgentControlAnswer(cmd);

}

} else {

if (cmd instanceof ReadyCommand) {

processReadyCommand(cmd);

}

_inProgress.incrementAndGet();

try {

answer = _resource.executeRequest(cmd);

} finally {

_inProgress.decrementAndGet();

}

if (answer == null) {

s_logger.debug("Response: unsupported command" + cmd.toString());

answer = Answer.createUnsupportedCommandAnswer(cmd);

}

} catch (final Throwable th) {

s_logger.warn("Caught: ", th);

final StringWriter writer = new StringWriter();

th.printStackTrace(new PrintWriter(writer));

answer = new Answer(cmd, false, writer.toString());

}

answers[i] = answer;

if (!answer.getResult() && request.stopOnError()) {

for (i++; i < cmds.length; i++) {

answers[i] = new Answer(cmds[i], false, "Stopped by previous failure");

}

break;

}

response = new Response(request, answers);

} finally {

if (s_logger.isDebugEnabled()) {

final String responseMsg = response.toString();

if (responseMsg != null) {

s_logger.debug(response.toString());

}

if (response != null) {

try {

link.send(response.toBytes());

} catch (final ClosedChannelException e) {

s_logger.warn("Unable to send response: " + response.toString());

}

public void processResponse(final Response response, final Link link) {

final Answer answer = response.getAnswer();

if (s_logger.isDebugEnabled()) {

s_logger.debug("Received response: " + response.toString());

}

if (answer instanceof StartupAnswer) {

processStartupAnswer(answer, response, link);

} else if (answer instanceof AgentControlAnswer) {

// Notice, we are doing callback while holding a lock!

synchronized (_controlListeners) {

for (final IAgentControlListener listener : _controlListeners) {

listener.processControlResponse(response, (AgentControlAnswer)answer);

}

} else {

setLastPingResponseTime();

}

public void processReadyCommand(final Command cmd) {

final ReadyCommand ready = (ReadyCommand)cmd;

s_logger.info("Proccess agent ready command, agent id = " + ready.getHostId());

if (ready.getHostId() != null) {

setId(ready.getHostId());

}

s_logger.info("Ready command is processed: agent id = " + getId());

}

public void processOtherTask(final Task task) {

final Object obj = task.get();

if (obj instanceof Response) {

if (System.currentTimeMillis() - _lastPingResponseTime > _pingInterval * _shell.getPingRetries()) {

s_logger.error("Ping Interval has gone past " + _pingInterval * _shell.getPingRetries() + ". Won't reconnect to mgt server, as connection is still alive");

return;

}

final PingCommand ping = _resource.getCurrentStatus(getId());

final Request request = new Request(_id, -1, ping, false);

request.setSequence(getNextSequence());

if (s_logger.isDebugEnabled()) {

s_logger.debug("Sending ping: " + request.toString());

}

try {

task.getLink().send(request.toBytes());

//if i can send pingcommand out, means the link is ok

setLastPingResponseTime();

} catch (final ClosedChannelException e) {

s_logger.warn("Unable to send request: " + request.toString());

}

} else if (obj instanceof Request) {

final Request req = (Request)obj;

final Command command = req.getCommand();

if (command.getContextParam("logid") != null) {

MDC.put("logcontextid", command.getContextParam("logid"));

}

Answer answer = null;

_inProgress.incrementAndGet();

try {

answer = _resource.executeRequest(command);

} finally {

_inProgress.decrementAndGet();

}

if (answer != null) {

final Response response = new Response(req, answer);

if (s_logger.isDebugEnabled()) {

s_logger.debug("Watch Sent: " + response.toString());

}

try {

task.getLink().send(response.toBytes());

} catch (final ClosedChannelException e) {

s_logger.warn("Unable to send response: " + response.toString());

}

} else {

s_logger.warn("Ignoring an unknown task");

}

public synchronized void setLastPingResponseTime() {

_lastPingResponseTime = System.currentTimeMillis();

}

protected synchronized long getNextSequence() {

return _sequence++;

}

@Override

public void registerControlListener(final IAgentControlListener listener) {

synchronized (_controlListeners) {

_controlListeners.add(listener);

}

@Override

public void unregisterControlListener(final IAgentControlListener listener) {

synchronized (_controlListeners) {

_controlListeners.remove(listener);

}

@Override

public AgentControlAnswer sendRequest(final AgentControlCommand cmd, final int timeoutInMilliseconds) throws AgentControlChannelException {

final Request request = new Request(getId(), -1, new Command[] {cmd}, true, false);

request.setSequence(getNextSequence());

final AgentControlListener listener = new AgentControlListener(request);

registerControlListener(listener);

try {

postRequest(request);

synchronized (listener) {

try {

listener.wait(timeoutInMilliseconds);

} catch (final InterruptedException e) {

s_logger.warn("sendRequest is interrupted, exit waiting");

}

return listener.getAnswer();

} finally {

unregisterControlListener(listener);

}

@Override

public void postRequest(final AgentControlCommand cmd) throws AgentControlChannelException {

final Request request = new Request(getId(), -1, new Command[] {cmd}, true, false);

request.setSequence(getNextSequence());

postRequest(request);

}

private void postRequest(final Request request) throws AgentControlChannelException {

if (_link != null) {

try {

_link.send(request.toBytes());

} catch (final ClosedChannelException e) {

s_logger.warn("Unable to post agent control reques: " + request.toString());

throw new AgentControlChannelException("Unable to post agent control request due to " + e.getMessage());

}

} else {

throw new AgentControlChannelException("Unable to post agent control request as link is not available");

}

public class AgentControlListener implements IAgentControlListener {

private AgentControlAnswer _answer;

private final Request _request;

public AgentControlListener(final Request request) {

_request = request;

}

public AgentControlAnswer getAnswer() {

return _answer;

}

@Override

public Answer processControlRequest(final Request request, final AgentControlCommand cmd) {

return null;

}

@Override

public void processControlResponse(final Response response, final AgentControlAnswer answer) {

if (_request.getSequence() == response.getSequence()) {

_answer = answer;

synchronized (this) {

notifyAll();

}

protected class ShutdownThread extends Thread {

Agent _agent;

public ShutdownThread(final Agent agent) {

super("AgentShutdownThread");

_agent = agent;

}

@Override

public void run() {

_agent.stop(ShutdownCommand.Requested, null);

}

public class WatchTask extends ManagedContextTimerTask {

protected Request _request;

protected Agent _agent;

protected Link _link;

public WatchTask(final Link link, final Request request, final Agent agent) {

super();

_request = request;

_link = link;

_agent = agent;

}

@Override

protected void runInContext() {

if (s_logger.isTraceEnabled()) {

s_logger.trace("Scheduling " + (_request instanceof Response ? "Ping" : "Watch Task"));

}

try {

if (_request instanceof Response) {

_ugentTaskPool.submit(new ServerHandler(Task.Type.OTHER, _link, _request));

} else {

_link.schedule(new ServerHandler(Task.Type.OTHER, _link, _request));

}

} catch (final ClosedChannelException e) {

s_logger.warn("Unable to schedule task because channel is closed");

}

public class StartupTask extends ManagedContextTimerTask {

protected Link _link;

protected volatile boolean cancelled = false;

public StartupTask(final Link link) {

s_logger.debug("Startup task created");

_link = link;

}

@Override

public synchronized boolean cancel() {

// TimerTask.cancel may fail depends on the calling context

if (!cancelled) {

cancelled = true;

_startupWait = _startupWaitDefault;

s_logger.debug("Startup task cancelled");

return super.cancel();

}

return true;

}

@Override

protected synchronized void runInContext() {

if (!cancelled) {

if (s_logger.isInfoEnabled()) {

s_logger.info("The startup command is now cancelled");

}

cancelled = true;

_startup = null;

_startupWait = _startupWaitDefault * 2;

reconnect(_link);

}

public class AgentRequestHandler extends Task {

public AgentRequestHandler(final Task.Type type, final Link link, final Request req) {

super(type, link, req);

}

@Override

protected void doTask(final Task task) throws TaskExecutionException {

final Request req = (Request)get();

if (!(req instanceof Response)) {

processRequest(req, task.getLink());

}

public class ServerHandler extends Task {

public ServerHandler(final Task.Type type, final Link link, final byte[] data) {

super(type, link, data);

}

public ServerHandler(final Task.Type type, final Link link, final Request req) {

super(type, link, req);

}

@Override

public void doTask(final Task task) throws TaskExecutionException {

if (task.getType() == Task.Type.CONNECT) {

_shell.getBackoffAlgorithm().reset();

setLink(task.getLink());

sendStartup(task.getLink());

} else if (task.getType() == Task.Type.DATA) {

Request request;

try {

request = Request.parse(task.getData());

if (request instanceof Response) {

//It's for pinganswer etc, should be processed immediately.

processResponse((Response)request, task.getLink());

} else {

//put the requests from mgt server into another thread pool, as the request may take a longer time to finish. Don't block the NIO main thread pool

//processRequest(request, task.getLink());

_executor.submit(new AgentRequestHandler(getType(), getLink(), request));

}

} catch (final ClassNotFoundException e) {

s_logger.error("Unable to find this request ");

} catch (final Exception e) {

s_logger.error("Error parsing task", e);

}

} else if (task.getType() == Task.Type.DISCONNECT) {

reconnect(task.getLink());

return;

} else if (task.getType() == Task.Type.OTHER) {

processOtherTask(task);

}

cloudstack/agent/src/com/cloud/agent/Agent.java at master · cloudmonger/cloudstack · GitHub

Expand file tree

Breadcrumbs

Agent.java

Latest commit

History

Breadcrumbs

Agent.java

File metadata and controls