src/network/access/qnetworkreplyimpl.cpp

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  41
  42 #include "qnetworkreplyimpl_p.h"
  43 #include "qnetworkaccessbackend_p.h"
  44 #include "qnetworkcookie.h"
  45 #include "qnetworkcookiejar.h"
  46 #include "qabstractnetworkcache.h"
  47 #include "QtCore/qcoreapplication.h"
  48 #include "QtCore/qdatetime.h"
  49 #include "QtNetwork/qsslconfiguration.h"
  50 #include "QtNetwork/qnetworksession.h"
  51 #include "qnetworkaccessmanager_p.h"
  52
  53 #include <QtCore/QCoreApplication>
  54
  55 Q_DECLARE_METATYPE(QSharedPointer<char>)
  56
  57 QT_BEGIN_NAMESPACE
  58
  59 inline QNetworkReplyImplPrivate::QNetworkReplyImplPrivate()
  60     : backend(0), outgoingData(0),
  61       copyDevice(0),
  62       cacheEnabled(false), cacheSaveDevice(0),
  63       notificationHandlingPaused(false),
  64       bytesDownloaded(0), lastBytesDownloaded(-1), bytesUploaded(-1), preMigrationDownloaded(-1),
  65       httpStatusCode(0),
  66       state(Idle)
  67       , downloadBufferReadPosition(0)
  68       , downloadBufferCurrentSize(0)
  69       , downloadBufferMaximumSize(0)
  70       , downloadBuffer(0)
  71 {
  72 }
  73
  74 void QNetworkReplyImplPrivate::_q_startOperation()
  75 {
  76     // ensure this function is only being called once
  77     if (state == Working || state == Finished) {
  78         qDebug("QNetworkReplyImpl::_q_startOperation was called more than once");
  79         return;
  80     }
  81     state = Working;
  82
  83     // note: if that method is called directly, it cannot happen that the backend is 0,
  84     // because we just checked via a qobject_cast that we got a http backend (see
  85     // QNetworkReplyImplPrivate::setup())
  86     if (!backend) {
  87         error(QNetworkReplyImpl::ProtocolUnknownError,
  88               QCoreApplication::translate("QNetworkReply", "Protocol \"%1\" is unknown").arg(url.scheme())); // not really true!;
  89         finished();
  90         return;
  91     }
  92
  93     if (!backend->start()) {
  94 #ifndef QT_NO_BEARERMANAGEMENT
  95         // backend failed to start because the session state is not Connected.
  96         // QNetworkAccessManager will call _q_startOperation again for us when the session
  97         // state changes.
  98         state = WaitingForSession;
  99
 100         QNetworkSession *session = manager->d_func()->networkSession.data();
 101
 102         if (session) {
 103             Q_Q(QNetworkReplyImpl);
 104
 105             QObject::connect(session, SIGNAL(error(QNetworkSession::SessionError)),
 106                              q, SLOT(_q_networkSessionFailed()));
 107
 108             if (!session->isOpen())
 109                 session->open();
 110         } else {
 111             qWarning("Backend is waiting for QNetworkSession to connect, but there is none!");
 112             state = Working;
 113             error(QNetworkReplyImpl::UnknownNetworkError,
 114                   QCoreApplication::translate("QNetworkReply", "Network session error."));
 115             finished();
 116         }
 117 #else
 118         qWarning("Backend start failed");
 119         state = Working;
 120         error(QNetworkReplyImpl::UnknownNetworkError,
 121               QCoreApplication::translate("QNetworkReply", "backend start error."));
 122         finished();
 123 #endif
 124         return;
 125     }
 126
 127     if (backend && backend->isSynchronous()) {
 128         state = Finished;
 129         q_func()->setFinished(true);
 130     } else {
 131         if (state != Finished) {
 132             if (operation == QNetworkAccessManager::GetOperation)
 133                 pendingNotifications.append(NotifyDownstreamReadyWrite);
 134
 135             handleNotifications();
 136         }
 137     }
 138 }
 139
 140 void QNetworkReplyImplPrivate::_q_copyReadyRead()
 141 {
 142     Q_Q(QNetworkReplyImpl);
 143     if (state != Working)
 144         return;
 145     if (!copyDevice || !q->isOpen())
 146         return;
 147
 148     // FIXME Optimize to use download buffer if it is a QBuffer.
 149     // Needs to be done where sendCacheContents() (?) of HTTP is emitting
 150     // metaDataChanged ?
 151
 152     forever {
 153         qint64 bytesToRead = nextDownstreamBlockSize();
 154         if (bytesToRead == 0)
 155             // we'll be called again, eventually
 156             break;
 157
 158         bytesToRead = qBound<qint64>(1, bytesToRead, copyDevice->bytesAvailable());
 159         QByteArray byteData;
 160         byteData.resize(bytesToRead);
 161         qint64 bytesActuallyRead = copyDevice->read(byteData.data(), byteData.size());
 162         if (bytesActuallyRead == -1) {
 163             byteData.clear();
 164             backendNotify(NotifyCopyFinished);
 165             break;
 166         }
 167
 168         byteData.resize(bytesActuallyRead);
 169         readBuffer.append(byteData);
 170
 171         if (!copyDevice->isSequential() && copyDevice->atEnd()) {
 172             backendNotify(NotifyCopyFinished);
 173             bytesDownloaded += bytesActuallyRead;
 174             break;
 175         }
 176
 177         bytesDownloaded += bytesActuallyRead;
 178     }
 179
 180     if (bytesDownloaded == lastBytesDownloaded) {
 181         // we didn't read anything
 182         return;
 183     }
 184
 185     lastBytesDownloaded = bytesDownloaded;
 186     QVariant totalSize = cookedHeaders.value(QNetworkRequest::ContentLengthHeader);
 187     if (preMigrationDownloaded != Q_INT64_C(-1))
 188         totalSize = totalSize.toLongLong() + preMigrationDownloaded;
 189     pauseNotificationHandling();
 190     // emit readyRead before downloadProgress incase this will cause events to be
 191     // processed and we get into a recursive call (as in QProgressDialog).
 192     emit q->readyRead();
 193     emit q->downloadProgress(bytesDownloaded,
 194                              totalSize.isNull() ? Q_INT64_C(-1) : totalSize.toLongLong());
 195     resumeNotificationHandling();
 196 }
 197
 198 void QNetworkReplyImplPrivate::_q_copyReadChannelFinished()
 199 {
 200     _q_copyReadyRead();
 201 }
 202
 203 void QNetworkReplyImplPrivate::_q_bufferOutgoingDataFinished()
 204 {
 205     Q_Q(QNetworkReplyImpl);
 206
 207     // make sure this is only called once, ever.
 208     //_q_bufferOutgoingData may call it or the readChannelFinished emission
 209     if (state != Buffering)
 210         return;
 211
 212     // disconnect signals
 213     QObject::disconnect(outgoingData, SIGNAL(readyRead()), q, SLOT(_q_bufferOutgoingData()));
 214     QObject::disconnect(outgoingData, SIGNAL(readChannelFinished()), q, SLOT(_q_bufferOutgoingDataFinished()));
 215
 216     // finally, start the request
 217     QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
 218 }
 219
 220 void QNetworkReplyImplPrivate::_q_bufferOutgoingData()
 221 {
 222     Q_Q(QNetworkReplyImpl);
 223
 224     if (!outgoingDataBuffer) {
 225         // first call, create our buffer
 226         outgoingDataBuffer = QSharedPointer<QRingBuffer>(new QRingBuffer());
 227
 228         QObject::connect(outgoingData, SIGNAL(readyRead()), q, SLOT(_q_bufferOutgoingData()));
 229         QObject::connect(outgoingData, SIGNAL(readChannelFinished()), q, SLOT(_q_bufferOutgoingDataFinished()));
 230     }
 231
 232     qint64 bytesBuffered = 0;
 233     qint64 bytesToBuffer = 0;
 234
 235     // read data into our buffer
 236     forever {
 237         bytesToBuffer = outgoingData->bytesAvailable();
 238         // unknown? just try 2 kB, this also ensures we always try to read the EOF
 239         if (bytesToBuffer <= 0)
 240             bytesToBuffer = 2*1024;
 241
 242         char *dst = outgoingDataBuffer->reserve(bytesToBuffer);
 243         bytesBuffered = outgoingData->read(dst, bytesToBuffer);
 244
 245         if (bytesBuffered == -1) {
 246             // EOF has been reached.
 247             outgoingDataBuffer->chop(bytesToBuffer);
 248
 249             _q_bufferOutgoingDataFinished();
 250             break;
 251         } else if (bytesBuffered == 0) {
 252             // nothing read right now, just wait until we get called again
 253             outgoingDataBuffer->chop(bytesToBuffer);
 254
 255             break;
 256         } else {
 257             // don't break, try to read() again
 258             outgoingDataBuffer->chop(bytesToBuffer - bytesBuffered);
 259         }
 260     }
 261 }
 262
 263 #ifndef QT_NO_BEARERMANAGEMENT
 264 void QNetworkReplyImplPrivate::_q_networkSessionConnected()
 265 {
 266     Q_Q(QNetworkReplyImpl);
 267
 268     if (manager.isNull())
 269         return;
 270
 271     QNetworkSession *session = manager->d_func()->networkSession.data();
 272     if (!session)
 273         return;
 274
 275     if (session->state() != QNetworkSession::Connected)
 276         return;
 277
 278     switch (state) {
 279     case QNetworkReplyImplPrivate::Buffering:
 280     case QNetworkReplyImplPrivate::Working:
 281     case QNetworkReplyImplPrivate::Reconnecting:
 282         // Migrate existing downloads to new network connection.
 283         migrateBackend();
 284         break;
 285     case QNetworkReplyImplPrivate::WaitingForSession:
 286         // Start waiting requests.
 287         QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
 288         break;
 289     default:
 290         ;
 291     }
 292 }
 293
 294 void QNetworkReplyImplPrivate::_q_networkSessionFailed()
 295 {
 296     // Abort waiting and working replies.
 297     if (state == WaitingForSession || state == Working) {
 298         state = Working;
 299         error(QNetworkReplyImpl::UnknownNetworkError,
 300               QCoreApplication::translate("QNetworkReply", "Network session error."));
 301         finished();
 302     }
 303 }
 304 #endif
 305
 306 void QNetworkReplyImplPrivate::setup(QNetworkAccessManager::Operation op, const QNetworkRequest &req,
 307                                      QIODevice *data)
 308 {
 309     Q_Q(QNetworkReplyImpl);
 310
 311     outgoingData = data;
 312     request = req;
 313     url = request.url();
 314     operation = op;
 315
 316     q->QIODevice::open(QIODevice::ReadOnly);
 317     // Internal code that does a HTTP reply for the synchronous Ajax
 318     // in QtWebKit.
 319     QVariant synchronousHttpAttribute = req.attribute(
 320             static_cast<QNetworkRequest::Attribute>(QNetworkRequest::SynchronousRequestAttribute));
 321     // The synchronous HTTP is a corner case, we will put all upload data in one big QByteArray in the outgoingDataBuffer.
 322     // Yes, this is not the most efficient thing to do, but on the other hand synchronous XHR needs to die anyway.
 323     if (synchronousHttpAttribute.toBool() && outgoingData) {
 324         outgoingDataBuffer = QSharedPointer<QRingBuffer>(new QRingBuffer());
 325         qint64 previousDataSize = 0;
 326         do {
 327             previousDataSize = outgoingDataBuffer->size();
 328             outgoingDataBuffer->append(outgoingData->readAll());
 329         } while (outgoingDataBuffer->size() != previousDataSize);
 330     }
 331
 332     if (backend)
 333         backend->setSynchronous(synchronousHttpAttribute.toBool());
 334
 335
 336     if (outgoingData && backend && !backend->isSynchronous()) {
 337         // there is data to be uploaded, e.g. HTTP POST.
 338
 339         if (!backend->needsResetableUploadData() || !outgoingData->isSequential()) {
 340             // backend does not need upload buffering or
 341             // fixed size non-sequential
 342             // just start the operation
 343             QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
 344         } else {
 345             bool bufferingDisallowed =
 346                     req.attribute(QNetworkRequest::DoNotBufferUploadDataAttribute,
 347                                   false).toBool();
 348
 349             if (bufferingDisallowed) {
 350                 // if a valid content-length header for the request was supplied, we can disable buffering
 351                 // if not, we will buffer anyway
 352                 if (req.header(QNetworkRequest::ContentLengthHeader).isValid()) {
 353                     QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
 354                 } else {
 355                     state = Buffering;
 356                     QMetaObject::invokeMethod(q, "_q_bufferOutgoingData", Qt::QueuedConnection);
 357                 }
 358             } else {
 359                 // _q_startOperation will be called when the buffering has finished.
 360                 state = Buffering;
 361                 QMetaObject::invokeMethod(q, "_q_bufferOutgoingData", Qt::QueuedConnection);
 362             }
 363         }
 364     } else {
 365         // for HTTP, we want to send out the request as fast as possible to the network, without
 366         // invoking methods in a QueuedConnection
 367 #ifndef QT_NO_HTTP
 368         if (backend && backend->isSynchronous()) {
 369             _q_startOperation();
 370         } else {
 371             QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
 372         }
 373 #else
 374         if (backend && backend->isSynchronous())
 375             _q_startOperation();
 376         else
 377             QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
 378 #endif // QT_NO_HTTP
 379         }
 380 }
 381
 382 void QNetworkReplyImplPrivate::backendNotify(InternalNotifications notification)
 383 {
 384     Q_Q(QNetworkReplyImpl);
 385     if (!pendingNotifications.contains(notification))
 386         pendingNotifications.enqueue(notification);
 387
 388     if (pendingNotifications.size() == 1)
 389         QCoreApplication::postEvent(q, new QEvent(QEvent::NetworkReplyUpdated));
 390 }
 391
 392 void QNetworkReplyImplPrivate::handleNotifications()
 393 {
 394     if (notificationHandlingPaused)
 395         return;
 396
 397     NotificationQueue current = pendingNotifications;
 398     pendingNotifications.clear();
 399
 400     if (state != Working)
 401         return;
 402
 403     while (state == Working && !current.isEmpty()) {
 404         InternalNotifications notification = current.dequeue();
 405         switch (notification) {
 406         case NotifyDownstreamReadyWrite:
 407             if (copyDevice)
 408                 _q_copyReadyRead();
 409             else
 410                 backend->downstreamReadyWrite();
 411             break;
 412
 413         case NotifyCloseDownstreamChannel:
 414             backend->closeDownstreamChannel();
 415             break;
 416
 417         case NotifyCopyFinished: {
 418             QIODevice *dev = copyDevice;
 419             copyDevice = 0;
 420             backend->copyFinished(dev);
 421             break;
 422         }
 423         }
 424     }
 425 }
 426
 427 // Do not handle the notifications while we are emitting downloadProgress
 428 // or readyRead
 429 void QNetworkReplyImplPrivate::pauseNotificationHandling()
 430 {
 431     notificationHandlingPaused = true;
 432 }
 433
 434 // Resume notification handling
 435 void QNetworkReplyImplPrivate::resumeNotificationHandling()
 436 {
 437     Q_Q(QNetworkReplyImpl);
 438     notificationHandlingPaused = false;
 439     if (pendingNotifications.size() >= 1)
 440         QCoreApplication::postEvent(q, new QEvent(QEvent::NetworkReplyUpdated));
 441 }
 442
 443 QAbstractNetworkCache *QNetworkReplyImplPrivate::networkCache() const
 444 {
 445     if (!backend)
 446         return 0;
 447     return backend->networkCache();
 448 }
 449
 450 void QNetworkReplyImplPrivate::createCache()
 451 {
 452     // check if we can save and if we're allowed to
 453     if (!networkCache()
 454         || !request.attribute(QNetworkRequest::CacheSaveControlAttribute, true).toBool())
 455         return;
 456     cacheEnabled = true;
 457 }
 458
 459 bool QNetworkReplyImplPrivate::isCachingEnabled() const
 460 {
 461     return (cacheEnabled && networkCache() != 0);
 462 }
 463
 464 void QNetworkReplyImplPrivate::setCachingEnabled(bool enable)
 465 {
 466     if (!enable && !cacheEnabled)
 467         return;                 // nothing to do
 468     if (enable && cacheEnabled)
 469         return;                 // nothing to do either!
 470
 471     if (enable) {
 472         if (bytesDownloaded) {
 473             // refuse to enable in this case
 474             qCritical("QNetworkReplyImpl: backend error: caching was enabled after some bytes had been written");
 475             return;
 476         }
 477
 478         createCache();
 479     } else {
 480         // someone told us to turn on, then back off?
 481         // ok... but you should make up your mind
 482         qDebug("QNetworkReplyImpl: setCachingEnabled(true) called after setCachingEnabled(false) -- "
 483                "backend %s probably needs to be fixed",
 484                backend->metaObject()->className());
 485         networkCache()->remove(url);
 486         cacheSaveDevice = 0;
 487         cacheEnabled = false;
 488     }
 489 }
 490
 491 void QNetworkReplyImplPrivate::completeCacheSave()
 492 {
 493     if (cacheEnabled && errorCode != QNetworkReplyImpl::NoError) {
 494         networkCache()->remove(url);
 495     } else if (cacheEnabled && cacheSaveDevice) {
 496         networkCache()->insert(cacheSaveDevice);
 497     }
 498     cacheSaveDevice = 0;
 499     cacheEnabled = false;
 500 }
 501
 502 void QNetworkReplyImplPrivate::emitUploadProgress(qint64 bytesSent, qint64 bytesTotal)
 503 {
 504     Q_Q(QNetworkReplyImpl);
 505     bytesUploaded = bytesSent;
 506     pauseNotificationHandling();
 507     emit q->uploadProgress(bytesSent, bytesTotal);
 508     resumeNotificationHandling();
 509 }
 510
 511
 512 qint64 QNetworkReplyImplPrivate::nextDownstreamBlockSize() const
 513 {
 514     enum { DesiredBufferSize = 32 * 1024 };
 515     if (readBufferMaxSize == 0)
 516         return DesiredBufferSize;
 517
 518     return qMax<qint64>(0, readBufferMaxSize - readBuffer.byteAmount());
 519 }
 520
 521 void QNetworkReplyImplPrivate::initCacheSaveDevice()
 522 {
 523     Q_Q(QNetworkReplyImpl);
 524
 525     // The disk cache does not support partial content, so don't even try to
 526     // save any such content into the cache.
 527     if (q->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt() == 206) {
 528         cacheEnabled = false;
 529         return;
 530     }
 531
 532     // save the meta data
 533     QNetworkCacheMetaData metaData;
 534     metaData.setUrl(url);
 535     metaData = backend->fetchCacheMetaData(metaData);
 536
 537     // save the redirect request also in the cache
 538     QVariant redirectionTarget = q->attribute(QNetworkRequest::RedirectionTargetAttribute);
 539     if (redirectionTarget.isValid()) {
 540         QNetworkCacheMetaData::AttributesMap attributes = metaData.attributes();
 541         attributes.insert(QNetworkRequest::RedirectionTargetAttribute, redirectionTarget);
 542         metaData.setAttributes(attributes);
 543     }
 544
 545     cacheSaveDevice = networkCache()->prepare(metaData);
 546
 547     if (!cacheSaveDevice || (cacheSaveDevice && !cacheSaveDevice->isOpen())) {
 548         if (cacheSaveDevice && !cacheSaveDevice->isOpen())
 549             qCritical("QNetworkReplyImpl: network cache returned a device that is not open -- "
 550                   "class %s probably needs to be fixed",
 551                   networkCache()->metaObject()->className());
 552
 553         networkCache()->remove(url);
 554         cacheSaveDevice = 0;
 555         cacheEnabled = false;
 556     }
 557 }
 558
 559 // we received downstream data and send this to the cache
 560 // and to our readBuffer (which in turn gets read by the user of QNetworkReply)
 561 void QNetworkReplyImplPrivate::appendDownstreamData(QByteDataBuffer &data)
 562 {
 563     Q_Q(QNetworkReplyImpl);
 564     if (!q->isOpen())
 565         return;
 566
 567     if (cacheEnabled && !cacheSaveDevice) {
 568         initCacheSaveDevice();
 569     }
 570
 571     qint64 bytesWritten = 0;
 572     for (int i = 0; i < data.bufferCount(); i++) {
 573         QByteArray const &item = data[i];
 574
 575         if (cacheSaveDevice)
 576             cacheSaveDevice->write(item.constData(), item.size());
 577         readBuffer.append(item);
 578
 579         bytesWritten += item.size();
 580     }
 581     data.clear();
 582
 583     bytesDownloaded += bytesWritten;
 584     lastBytesDownloaded = bytesDownloaded;
 585
 586     appendDownstreamDataSignalEmissions();
 587 }
 588
 589 void QNetworkReplyImplPrivate::appendDownstreamDataSignalEmissions()
 590 {
 591     Q_Q(QNetworkReplyImpl);
 592
 593     QVariant totalSize = cookedHeaders.value(QNetworkRequest::ContentLengthHeader);
 594     if (preMigrationDownloaded != Q_INT64_C(-1))
 595         totalSize = totalSize.toLongLong() + preMigrationDownloaded;
 596     pauseNotificationHandling();
 597     // important: At the point of this readyRead(), the data parameter list must be empty,
 598     // else implicit sharing will trigger memcpy when the user is reading data!
 599     emit q->readyRead();
 600     // emit readyRead before downloadProgress incase this will cause events to be
 601     // processed and we get into a recursive call (as in QProgressDialog).
 602     emit q->downloadProgress(bytesDownloaded,
 603                              totalSize.isNull() ? Q_INT64_C(-1) : totalSize.toLongLong());
 604
 605     resumeNotificationHandling();
 606     // do we still have room in the buffer?
 607     if (nextDownstreamBlockSize() > 0)
 608         backendNotify(QNetworkReplyImplPrivate::NotifyDownstreamReadyWrite);
 609 }
 610
 611 // this is used when it was fetched from the cache, right?
 612 void QNetworkReplyImplPrivate::appendDownstreamData(QIODevice *data)
 613 {
 614     Q_Q(QNetworkReplyImpl);
 615     if (!q->isOpen())
 616         return;
 617
 618     // read until EOF from data
 619     if (copyDevice) {
 620         qCritical("QNetworkReplyImpl: copy from QIODevice already in progress -- "
 621                   "backend probly needs to be fixed");
 622         return;
 623     }
 624
 625     copyDevice = data;
 626     q->connect(copyDevice, SIGNAL(readyRead()), SLOT(_q_copyReadyRead()));
 627     q->connect(copyDevice, SIGNAL(readChannelFinished()), SLOT(_q_copyReadChannelFinished()));
 628
 629     // start the copy:
 630     _q_copyReadyRead();
 631 }
 632
 633 void QNetworkReplyImplPrivate::appendDownstreamData(const QByteArray &data)
 634 {
 635     Q_UNUSED(data)
 636     // TODO implement
 637
 638     // TODO call
 639
 640     qFatal("QNetworkReplyImplPrivate::appendDownstreamData not implemented");
 641 }
 642
 643 static void downloadBufferDeleter(char *ptr)
 644 {
 645     delete[] ptr;
 646 }
 647
 648 char* QNetworkReplyImplPrivate::getDownloadBuffer(qint64 size)
 649 {
 650     Q_Q(QNetworkReplyImpl);
 651
 652     if (!downloadBuffer) {
 653         // We are requested to create it
 654         // Check attribute() if allocating a buffer of that size can be allowed
 655         QVariant bufferAllocationPolicy = request.attribute(QNetworkRequest::MaximumDownloadBufferSizeAttribute);
 656         if (bufferAllocationPolicy.isValid() && bufferAllocationPolicy.toLongLong() >= size) {
 657             downloadBufferCurrentSize = 0;
 658             downloadBufferMaximumSize = size;
 659             downloadBuffer = new char[downloadBufferMaximumSize]; // throws if allocation fails
 660             downloadBufferPointer = QSharedPointer<char>(downloadBuffer, downloadBufferDeleter);
 661
 662             q->setAttribute(QNetworkRequest::DownloadBufferAttribute, qVariantFromValue<QSharedPointer<char> > (downloadBufferPointer));
 663         }
 664     }
 665
 666     return downloadBuffer;
 667 }
 668
 669 void QNetworkReplyImplPrivate::setDownloadBuffer(QSharedPointer<char> sp, qint64 size)
 670 {
 671     Q_Q(QNetworkReplyImpl);
 672
 673     downloadBufferPointer = sp;
 674     downloadBuffer = downloadBufferPointer.data();
 675     downloadBufferCurrentSize = 0;
 676     downloadBufferMaximumSize = size;
 677     q->setAttribute(QNetworkRequest::DownloadBufferAttribute, qVariantFromValue<QSharedPointer<char> > (downloadBufferPointer));
 678 }
 679
 680
 681 void QNetworkReplyImplPrivate::appendDownstreamDataDownloadBuffer(qint64 bytesReceived, qint64 bytesTotal)
 682 {
 683     Q_Q(QNetworkReplyImpl);
 684     if (!q->isOpen())
 685         return;
 686
 687     if (cacheEnabled && !cacheSaveDevice)
 688         initCacheSaveDevice();
 689
 690     if (cacheSaveDevice && bytesReceived == bytesTotal) {
 691 //        if (lastBytesDownloaded == -1)
 692 //            lastBytesDownloaded = 0;
 693 //        cacheSaveDevice->write(downloadBuffer + lastBytesDownloaded, bytesReceived - lastBytesDownloaded);
 694
 695         // Write everything in one go if we use a download buffer. might be more performant.
 696         cacheSaveDevice->write(downloadBuffer, bytesTotal);
 697     }
 698
 699     bytesDownloaded = bytesReceived;
 700     lastBytesDownloaded = bytesReceived;
 701
 702     downloadBufferCurrentSize = bytesReceived;
 703
 704     // Only emit readyRead when actual data is there
 705     // emit readyRead before downloadProgress incase this will cause events to be
 706     // processed and we get into a recursive call (as in QProgressDialog).
 707     if (bytesDownloaded > 0)
 708         emit q->readyRead();
 709     emit q->downloadProgress(bytesDownloaded, bytesTotal);
 710 }
 711
 712 void QNetworkReplyImplPrivate::finished()
 713 {
 714     Q_Q(QNetworkReplyImpl);
 715
 716     if (state == Finished || state == Aborted || state == WaitingForSession)
 717         return;
 718
 719     pauseNotificationHandling();
 720     QVariant totalSize = cookedHeaders.value(QNetworkRequest::ContentLengthHeader);
 721     if (preMigrationDownloaded != Q_INT64_C(-1))
 722         totalSize = totalSize.toLongLong() + preMigrationDownloaded;
 723
 724     if (!manager.isNull()) {
 725 #ifndef QT_NO_BEARERMANAGEMENT
 726         QNetworkSession *session = manager->d_func()->networkSession.data();
 727         if (session && session->state() == QNetworkSession::Roaming &&
 728             state == Working && errorCode != QNetworkReply::OperationCanceledError) {
 729             // only content with a known size will fail with a temporary network failure error
 730             if (!totalSize.isNull()) {
 731                 if (bytesDownloaded != totalSize) {
 732                     if (migrateBackend()) {
 733                         // either we are migrating or the request is finished/aborted
 734                         if (state == Reconnecting || state == WaitingForSession) {
 735                             resumeNotificationHandling();
 736                             return; // exit early if we are migrating.
 737                         }
 738                     } else {
 739                         error(QNetworkReply::TemporaryNetworkFailureError,
 740                               QNetworkReply::tr("Temporary network failure."));
 741                     }
 742                 }
 743             }
 744         }
 745 #endif
 746     }
 747     resumeNotificationHandling();
 748
 749     state = Finished;
 750     q->setFinished(true);
 751
 752     pendingNotifications.clear();
 753
 754     pauseNotificationHandling();
 755     if (totalSize.isNull() || totalSize == -1) {
 756         emit q->downloadProgress(bytesDownloaded, bytesDownloaded);
 757     }
 758
 759     if (bytesUploaded == -1 && (outgoingData || outgoingDataBuffer))
 760         emit q->uploadProgress(0, 0);
 761     resumeNotificationHandling();
 762
 763     // if we don't know the total size of or we received everything save the cache
 764     if (totalSize.isNull() || totalSize == -1 || bytesDownloaded == totalSize)
 765         completeCacheSave();
 766
 767     // note: might not be a good idea, since users could decide to delete us
 768     // which would delete the backend too...
 769     // maybe we should protect the backend
 770     pauseNotificationHandling();
 771     emit q->readChannelFinished();
 772     emit q->finished();
 773     resumeNotificationHandling();
 774 }
 775
 776 void QNetworkReplyImplPrivate::error(QNetworkReplyImpl::NetworkError code, const QString &errorMessage)
 777 {
 778     Q_Q(QNetworkReplyImpl);
 779     // Can't set and emit multiple errors.
 780     if (errorCode != QNetworkReply::NoError) {
 781         qWarning( "QNetworkReplyImplPrivate::error: Internal problem, this method must only be called once.");
 782         return;
 783     }
 784
 785     errorCode = code;
 786     q->setErrorString(errorMessage);
 787
 788     // note: might not be a good idea, since users could decide to delete us
 789     // which would delete the backend too...
 790     // maybe we should protect the backend
 791     emit q->error(code);
 792 }
 793
 794 void QNetworkReplyImplPrivate::metaDataChanged()
 795 {
 796     Q_Q(QNetworkReplyImpl);
 797     // 1. do we have cookies?
 798     // 2. are we allowed to set them?
 799     if (cookedHeaders.contains(QNetworkRequest::SetCookieHeader) && !manager.isNull()
 800         && (static_cast<QNetworkRequest::LoadControl>
 801             (request.attribute(QNetworkRequest::CookieSaveControlAttribute,
 802                                QNetworkRequest::Automatic).toInt()) == QNetworkRequest::Automatic)) {
 803         QList<QNetworkCookie> cookies =
 804             qvariant_cast<QList<QNetworkCookie> >(cookedHeaders.value(QNetworkRequest::SetCookieHeader));
 805         QNetworkCookieJar *jar = manager->cookieJar();
 806         if (jar)
 807             jar->setCookiesFromUrl(cookies, url);
 808     }
 809     emit q->metaDataChanged();
 810 }
 811
 812 void QNetworkReplyImplPrivate::redirectionRequested(const QUrl &target)
 813 {
 814     attributes.insert(QNetworkRequest::RedirectionTargetAttribute, target);
 815 }
 816
 817 void QNetworkReplyImplPrivate::sslErrors(const QList<QSslError> &errors)
 818 {
 819 #ifndef QT_NO_SSL
 820     Q_Q(QNetworkReplyImpl);
 821     emit q->sslErrors(errors);
 822 #else
 823     Q_UNUSED(errors);
 824 #endif
 825 }
 826
 827 QNetworkReplyImpl::QNetworkReplyImpl(QObject *parent)
 828     : QNetworkReply(*new QNetworkReplyImplPrivate, parent)
 829 {
 830 }
 831
 832 QNetworkReplyImpl::~QNetworkReplyImpl()
 833 {
 834     Q_D(QNetworkReplyImpl);
 835
 836     // This code removes the data from the cache if it was prematurely aborted.
 837     // See QNetworkReplyImplPrivate::completeCacheSave(), we disable caching there after the cache
 838     // save had been properly finished. So if it is still enabled it means we got deleted/aborted.
 839     if (d->isCachingEnabled())
 840         d->networkCache()->remove(url());
 841 }
 842
 843 void QNetworkReplyImpl::abort()
 844 {
 845     Q_D(QNetworkReplyImpl);
 846     if (d->state == QNetworkReplyImplPrivate::Finished || d->state == QNetworkReplyImplPrivate::Aborted)
 847         return;
 848
 849     // stop both upload and download
 850     if (d->outgoingData)
 851         disconnect(d->outgoingData, 0, this, 0);
 852     if (d->copyDevice)
 853         disconnect(d->copyDevice, 0, this, 0);
 854
 855     QNetworkReply::close();
 856
 857     if (d->state != QNetworkReplyImplPrivate::Finished) {
 858         // call finished which will emit signals
 859         d->error(OperationCanceledError, tr("Operation canceled"));
 860         if (d->state == QNetworkReplyImplPrivate::WaitingForSession)
 861             d->state = QNetworkReplyImplPrivate::Working;
 862         d->finished();
 863     }
 864     d->state = QNetworkReplyImplPrivate::Aborted;
 865
 866     // finished may access the backend
 867     if (d->backend) {
 868         d->backend->deleteLater();
 869         d->backend = 0;
 870     }
 871 }
 872
 873 void QNetworkReplyImpl::close()
 874 {
 875     Q_D(QNetworkReplyImpl);
 876     if (d->state == QNetworkReplyImplPrivate::Aborted ||
 877         d->state == QNetworkReplyImplPrivate::Finished)
 878         return;
 879
 880     // stop the download
 881     if (d->backend)
 882         d->backend->closeDownstreamChannel();
 883     if (d->copyDevice)
 884         disconnect(d->copyDevice, 0, this, 0);
 885
 886     QNetworkReply::close();
 887
 888     // call finished which will emit signals
 889     d->error(OperationCanceledError, tr("Operation canceled"));
 890     d->finished();
 891 }
 892
 893 bool QNetworkReplyImpl::canReadLine () const
 894 {
 895     Q_D(const QNetworkReplyImpl);
 896     return QNetworkReply::canReadLine() || d->readBuffer.canReadLine();
 897 }
 898
 899
 900 /*!
 901     Returns the number of bytes available for reading with
 902     QIODevice::read(). The number of bytes available may grow until
 903     the finished() signal is emitted.
 904 */
 905 qint64 QNetworkReplyImpl::bytesAvailable() const
 906 {
 907     // Special case for the "zero copy" download buffer
 908     Q_D(const QNetworkReplyImpl);
 909     if (d->downloadBuffer) {
 910         qint64 maxAvail = d->downloadBufferCurrentSize - d->downloadBufferReadPosition;
 911         return QNetworkReply::bytesAvailable() + maxAvail;
 912     }
 913
 914     return QNetworkReply::bytesAvailable() + d_func()->readBuffer.byteAmount();
 915 }
 916
 917 void QNetworkReplyImpl::setReadBufferSize(qint64 size)
 918 {
 919     Q_D(QNetworkReplyImpl);
 920     if (size > d->readBufferMaxSize &&
 921         size > d->readBuffer.byteAmount())
 922         d->backendNotify(QNetworkReplyImplPrivate::NotifyDownstreamReadyWrite);
 923
 924     QNetworkReply::setReadBufferSize(size);
 925
 926     if (d->backend)
 927         d->backend->setDownstreamLimited(d->readBufferMaxSize > 0);
 928 }
 929
 930 #ifndef QT_NO_SSL
 931 void QNetworkReplyImpl::sslConfigurationImplementation(QSslConfiguration &configuration) const
 932 {
 933     Q_D(const QNetworkReplyImpl);
 934     if (d->backend)
 935         d->backend->fetchSslConfiguration(configuration);
 936 }
 937
 938 void QNetworkReplyImpl::setSslConfigurationImplementation(const QSslConfiguration &config)
 939 {
 940     Q_D(QNetworkReplyImpl);
 941     if (d->backend && !config.isNull())
 942         d->backend->setSslConfiguration(config);
 943 }
 944
 945 void QNetworkReplyImpl::ignoreSslErrors()
 946 {
 947     Q_D(QNetworkReplyImpl);
 948     if (d->backend)
 949         d->backend->ignoreSslErrors();
 950 }
 951
 952 void QNetworkReplyImpl::ignoreSslErrorsImplementation(const QList<QSslError> &errors)
 953 {
 954     Q_D(QNetworkReplyImpl);
 955     if (d->backend)
 956         d->backend->ignoreSslErrors(errors);
 957 }
 958 #endif  // QT_NO_SSL
 959
 960 /*!
 961     \internal
 962 */
 963 qint64 QNetworkReplyImpl::readData(char *data, qint64 maxlen)
 964 {
 965     Q_D(QNetworkReplyImpl);
 966
 967     // Special case code if we have the "zero copy" download buffer
 968     if (d->downloadBuffer) {
 969         qint64 maxAvail = qMin<qint64>(d->downloadBufferCurrentSize - d->downloadBufferReadPosition, maxlen);
 970         if (maxAvail == 0)
 971             return d->state == QNetworkReplyImplPrivate::Finished ? -1 : 0;
 972         // FIXME what about "Aborted" state?
 973         qMemCopy(data, d->downloadBuffer + d->downloadBufferReadPosition, maxAvail);
 974         d->downloadBufferReadPosition += maxAvail;
 975         return maxAvail;
 976     }
 977
 978
 979     if (d->readBuffer.isEmpty())
 980         return d->state == QNetworkReplyImplPrivate::Finished ? -1 : 0;
 981     // FIXME what about "Aborted" state?
 982
 983     d->backendNotify(QNetworkReplyImplPrivate::NotifyDownstreamReadyWrite);
 984     if (maxlen == 1) {
 985         // optimization for getChar()
 986         *data = d->readBuffer.getChar();
 987         return 1;
 988     }
 989
 990     maxlen = qMin<qint64>(maxlen, d->readBuffer.byteAmount());
 991     return d->readBuffer.read(data, maxlen);
 992 }
 993
 994 /*!
 995    \internal Reimplemented for internal purposes
 996 */
 997 bool QNetworkReplyImpl::event(QEvent *e)
 998 {
 999     if (e->type() == QEvent::NetworkReplyUpdated) {
1000         d_func()->handleNotifications();
1001         return true;
1002     }
1003
1004     return QObject::event(e);
1005 }
1006
1007 /*
1008     Migrates the backend of the QNetworkReply to a new network connection if required.  Returns
1009     true if the reply is migrated or it is not required; otherwise returns false.
1010 */
1011 bool QNetworkReplyImplPrivate::migrateBackend()
1012 {
1013     Q_Q(QNetworkReplyImpl);
1014
1015     // Network reply is already finished or aborted, don't need to migrate.
1016     if (state == Finished || state == Aborted)
1017         return true;
1018
1019     // Request has outgoing data, not migrating.
1020     if (outgoingData)
1021         return false;
1022
1023     // Request is serviced from the cache, don't need to migrate.
1024     if (copyDevice)
1025         return true;
1026
1027     // Backend does not support resuming download.
1028     if (!backend->canResume())
1029         return false;
1030
1031     state = QNetworkReplyImplPrivate::Reconnecting;
1032
1033     if (backend) {
1034         delete backend;
1035         backend = 0;
1036     }
1037
1038     cookedHeaders.clear();
1039     rawHeaders.clear();
1040
1041     preMigrationDownloaded = bytesDownloaded;
1042
1043     backend = manager->d_func()->findBackend(operation, request);
1044
1045     if (backend) {
1046         backend->setParent(q);
1047         backend->reply = this;
1048         backend->setResumeOffset(bytesDownloaded);
1049     }
1050
1051 #ifndef QT_NO_HTTP
1052     QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
1053 #else
1054     QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
1055 #endif // QT_NO_HTTP
1056
1057     return true;
1058 }
1059
1060 #ifndef QT_NO_BEARERMANAGEMENT
1061 QDisabledNetworkReply::QDisabledNetworkReply(QObject *parent,
1062                                              const QNetworkRequest &req,
1063                                              QNetworkAccessManager::Operation op)
1064 :   QNetworkReply(parent)
1065 {
1066     setRequest(req);
1067     setUrl(req.url());
1068     setOperation(op);
1069
1070     qRegisterMetaType<QNetworkReply::NetworkError>("QNetworkReply::NetworkError");
1071
1072     QString msg = QCoreApplication::translate("QNetworkAccessManager",
1073                                               "Network access is disabled.");
1074     setError(UnknownNetworkError, msg);
1075
1076     QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
1077         Q_ARG(QNetworkReply::NetworkError, UnknownNetworkError));
1078     QMetaObject::invokeMethod(this, "finished", Qt::QueuedConnection);
1079 }
1080
1081 QDisabledNetworkReply::~QDisabledNetworkReply()
1082 {
1083 }
1084 #endif
1085
1086 QT_END_NAMESPACE
1087
1088 #include "moc_qnetworkreplyimpl_p.cpp"
1089