/
qgswfsfeatureiterator.cpp
1266 lines (1132 loc) · 42.8 KB
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qgswfsfeatureiterator.cpp
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/***************************************************************************
qgswfsfeatureiterator.cpp
---------------------
begin : Januar 2013
copyright : (C) 2013 by Marco Hugentobler
(C) 2016 by Even Rouault
email : marco dot hugentobler at sourcepole dot ch
even.rouault at spatialys.com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsmessagelog.h"
#include "qgsgeometry.h"
#include "qgsgml.h"
#include "qgsogcutils.h"
#include "qgswfsconstants.h"
#include "qgswfsfeatureiterator.h"
#include "qgswfsprovider.h"
#include "qgswfsshareddata.h"
#include "qgswfsutils.h"
#include "qgslogger.h"
#include "qgssettings.h"
#include <QDir>
#include <QProgressDialog>
#include <QTimer>
#include <QStyle>
QgsWFSFeatureHitsAsyncRequest::QgsWFSFeatureHitsAsyncRequest( QgsWFSDataSourceURI &uri )
: QgsWfsRequest( uri.uri() )
, mNumberMatched( -1 )
{
connect( this, SIGNAL( downloadFinished() ), this, SLOT( hitsReplyFinished() ) );
}
QgsWFSFeatureHitsAsyncRequest::~QgsWFSFeatureHitsAsyncRequest()
{
}
void QgsWFSFeatureHitsAsyncRequest::launch( const QUrl &url )
{
sendGET( url,
false, /* synchronous */
true, /* forceRefresh */
false /* cache */ );
}
void QgsWFSFeatureHitsAsyncRequest::hitsReplyFinished()
{
if ( mErrorCode == NoError )
{
QByteArray data = response();
QgsGmlStreamingParser gmlParser( QLatin1String( "" ), QLatin1String( "" ), QgsFields() );
QString errorMsg;
if ( gmlParser.processData( data, true, errorMsg ) )
{
mNumberMatched = ( gmlParser.numberMatched() >= 0 ) ? gmlParser.numberMatched() :
gmlParser.numberReturned();
}
else
{
QgsMessageLog::logMessage( errorMsg, tr( "WFS" ) );
}
}
emit gotHitsResponse();
}
QString QgsWFSFeatureHitsAsyncRequest::errorMessageWithReason( const QString &reason )
{
return tr( "Download of feature count failed: %1" ).arg( reason );
}
// -------------------------
QgsWFSFeatureDownloader::QgsWFSFeatureDownloader( QgsWFSSharedData *shared )
: QgsWfsRequest( shared->mURI.uri() )
, mShared( shared )
, mStop( false )
, mProgressDialog( nullptr )
, mProgressDialogShowImmediately( false )
, mSupportsPaging( shared->mCaps.supportsPaging )
, mRemoveNSPrefix( false )
, mNumberMatched( -1 )
, mMainWindow( nullptr )
, mTimer( nullptr )
, mFeatureHitsAsyncRequest( shared->mURI )
, mTotalDownloadedFeatureCount( 0 )
{
// Needed because used by a signal
qRegisterMetaType< QVector<QgsWFSFeatureGmlIdPair> >( "QVector<QgsWFSFeatureGmlIdPair>" );
}
QgsWFSFeatureDownloader::~QgsWFSFeatureDownloader()
{
stop();
if ( mProgressDialog )
mProgressDialog->deleteLater();
if ( mTimer )
mTimer->deleteLater();
}
void QgsWFSFeatureDownloader::stop()
{
QgsDebugMsg( "QgsWFSFeatureDownloader::stop()" );
mStop = true;
emit doStop();
}
void QgsWFSFeatureDownloader::setStopFlag()
{
QgsDebugMsg( "QgsWFSFeatureDownloader::setStopFlag()" );
mStop = true;
}
QgsWFSProgressDialog::QgsWFSProgressDialog( const QString &labelText,
const QString &cancelButtonText,
int minimum, int maximum, QWidget *parent )
: QProgressDialog( labelText, cancelButtonText, minimum, maximum, parent )
{
mCancel = new QPushButton( cancelButtonText, this );
setCancelButton( mCancel );
mHide = new QPushButton( tr( "Hide" ), this );
connect( mHide, SIGNAL( clicked() ), this, SIGNAL( hide() ) );
}
void QgsWFSProgressDialog::resizeEvent( QResizeEvent *ev )
{
QProgressDialog::resizeEvent( ev );
// Note: this relies heavily on the details of the layout done in QProgressDialogPrivate::layout()
// Might be a bit fragile depending on QT versions.
QRect rect = geometry();
QRect cancelRect = mCancel->geometry();
QRect hideRect = mHide->geometry();
int mtb = style()->pixelMetric( QStyle::PM_DefaultTopLevelMargin );
int mlr = qMin( width() / 10, mtb );
if ( rect.width() - cancelRect.x() - cancelRect.width() > mlr )
{
// Force right alighnment of cancel button
cancelRect.setX( rect.width() - cancelRect.width() - mlr );
mCancel->setGeometry( cancelRect );
}
mHide->setGeometry( rect.width() - cancelRect.x() - cancelRect.width(),
cancelRect.y(), hideRect.width(), cancelRect.height() );
}
void QgsWFSFeatureDownloader::hideProgressDialog()
{
mShared->mHideProgressDialog = true;
mProgressDialog->deleteLater();
mProgressDialog = nullptr;
}
// Called from GUI thread
void QgsWFSFeatureDownloader::createProgressDialog()
{
if ( mStop )
return;
Q_ASSERT( !mProgressDialog );
mProgressDialog = new QgsWFSProgressDialog( tr( "Loading features for layer %1" ).arg( mShared->mURI.typeName() ),
tr( "Abort" ), 0, mNumberMatched, mMainWindow );
mProgressDialog->setWindowTitle( tr( "QGIS" ) );
mProgressDialog->setValue( 0 );
if ( mProgressDialogShowImmediately )
mProgressDialog->show();
connect( mProgressDialog, SIGNAL( canceled() ), this, SLOT( setStopFlag() ), Qt::DirectConnection );
connect( mProgressDialog, SIGNAL( canceled() ), this, SLOT( stop() ) );
connect( mProgressDialog, SIGNAL( hide() ), this, SLOT( hideProgressDialog() ) );
connect( this, SIGNAL( updateProgress( int ) ), mProgressDialog, SLOT( setValue( int ) ) );
}
QString QgsWFSFeatureDownloader::sanitizeFilter( QString filter )
{
filter = filter.replace( QLatin1String( "<fes:ValueReference xmlns:fes=\"http://www.opengis.net/fes/2.0\">" ), QLatin1String( "<fes:ValueReference>" ) );
QString nsPrefix( QgsWFSUtils::nameSpacePrefix( mShared->mURI.typeName() ) );
if ( mRemoveNSPrefix && !nsPrefix.isEmpty() )
filter = filter.replace( "<fes:ValueReference>" + nsPrefix + ":", QLatin1String( "<fes:ValueReference>" ) );
return filter;
}
QUrl QgsWFSFeatureDownloader::buildURL( int startIndex, int maxFeatures, bool forHits )
{
QUrl getFeatureUrl( mShared->mURI.baseURL() );
getFeatureUrl.addQueryItem( QStringLiteral( "REQUEST" ), QStringLiteral( "GetFeature" ) );
getFeatureUrl.addQueryItem( QStringLiteral( "VERSION" ), mShared->mWFSVersion );
QString typenames;
if ( mShared->mLayerPropertiesList.isEmpty() )
{
typenames = mShared->mURI.typeName();
}
else
{
Q_FOREACH ( const QgsOgcUtils::LayerProperties layerProperties, mShared->mLayerPropertiesList )
{
if ( !typenames.isEmpty() )
typenames += QLatin1String( "," );
typenames += layerProperties.mName;
}
}
if ( mShared->mWFSVersion.startsWith( QLatin1String( "2.0" ) ) )
getFeatureUrl.addQueryItem( QStringLiteral( "TYPENAMES" ), typenames );
else
getFeatureUrl.addQueryItem( QStringLiteral( "TYPENAME" ), typenames );
if ( forHits )
{
getFeatureUrl.addQueryItem( QStringLiteral( "RESULTTYPE" ), QStringLiteral( "hits" ) );
}
else if ( maxFeatures > 0 )
{
if ( mSupportsPaging )
{
// Note: always include the STARTINDEX, even for zero, has some (likely buggy)
// implementations do not return the same results if STARTINDEX=0 is specified
// or not.
// For example http://demo.opengeo.org/geoserver/wfs?SERVICE=WFS&REQUEST=GetFeature&VERSION=2.0.0&TYPENAMES=ne:ne_10m_admin_0_countries&STARTINDEX=0&COUNT=253
// doesn't include ne_10m_admin_0_countries.99, as expected since it is
// at index 254.
getFeatureUrl.addQueryItem( QStringLiteral( "STARTINDEX" ), QString::number( startIndex ) );
}
if ( mShared->mWFSVersion.startsWith( QLatin1String( "2.0" ) ) )
getFeatureUrl.addQueryItem( QStringLiteral( "COUNT" ), QString::number( maxFeatures ) );
else
getFeatureUrl.addQueryItem( QStringLiteral( "MAXFEATURES" ), QString::number( maxFeatures ) );
}
QString srsName( mShared->srsName() );
if ( !srsName.isEmpty() && !forHits )
{
getFeatureUrl.addQueryItem( QStringLiteral( "SRSNAME" ), srsName );
}
// In case we must issue a BBOX and we have a filter, we must combine
// both as a single filter, as both BBOX and FILTER aren't supported together
if ( !mShared->mRect.isNull() && !mShared->mWFSFilter.isEmpty() )
{
double minx = mShared->mRect.xMinimum();
double miny = mShared->mRect.yMinimum();
double maxx = mShared->mRect.xMaximum();
double maxy = mShared->mRect.yMaximum();
QString filterBbox( QStringLiteral( "intersects_bbox($geometry, geomFromWKT('LINESTRING(%1 %2,%3 %4)'))" ).
arg( minx ).arg( miny ).arg( maxx ).arg( maxy ) );
QgsExpression bboxExp( filterBbox );
QgsOgcUtils::GMLVersion gmlVersion;
QgsOgcUtils::FilterVersion filterVersion;
bool honourAxisOrientation = false;
if ( mShared->mWFSVersion.startsWith( QLatin1String( "1.0" ) ) )
{
gmlVersion = QgsOgcUtils::GML_2_1_2;
filterVersion = QgsOgcUtils::FILTER_OGC_1_0;
}
else if ( mShared->mWFSVersion.startsWith( QLatin1String( "1.1" ) ) )
{
honourAxisOrientation = !mShared->mURI.ignoreAxisOrientation();
gmlVersion = QgsOgcUtils::GML_3_1_0;
filterVersion = QgsOgcUtils::FILTER_OGC_1_1;
}
else
{
honourAxisOrientation = !mShared->mURI.ignoreAxisOrientation();
gmlVersion = QgsOgcUtils::GML_3_2_1;
filterVersion = QgsOgcUtils::FILTER_FES_2_0;
}
QDomDocument doc;
QString geometryAttribute( mShared->mGeometryAttribute );
if ( mShared->mLayerPropertiesList.size() > 1 )
geometryAttribute = mShared->mURI.typeName() + "/" + geometryAttribute;
QDomElement bboxElem = QgsOgcUtils::expressionToOgcFilter( bboxExp, doc,
gmlVersion, filterVersion, geometryAttribute, mShared->srsName(),
honourAxisOrientation, mShared->mURI.invertAxisOrientation() );
doc.appendChild( bboxElem );
QDomNode bboxNode = bboxElem.firstChildElement();
bboxNode = bboxElem.removeChild( bboxNode );
QDomDocument filterDoc;
( void )filterDoc.setContent( mShared->mWFSFilter, true );
QDomNode filterNode = filterDoc.firstChildElement().firstChildElement();
filterNode = filterDoc.firstChildElement().removeChild( filterNode );
QDomElement andElem = doc.createElement( ( filterVersion == QgsOgcUtils::FILTER_FES_2_0 ) ? "fes:And" : "ogc:And" );
andElem.appendChild( bboxNode );
andElem.appendChild( filterNode );
doc.firstChildElement().appendChild( andElem );
getFeatureUrl.addQueryItem( QStringLiteral( "FILTER" ), sanitizeFilter( doc.toString() ) );
}
else if ( !mShared->mRect.isNull() )
{
bool invertAxis = false;
if ( !mShared->mWFSVersion.startsWith( QLatin1String( "1.0" ) ) && !mShared->mURI.ignoreAxisOrientation() &&
mShared->mSourceCRS.hasAxisInverted() )
{
invertAxis = true;
}
if ( mShared->mURI.invertAxisOrientation() )
{
invertAxis = !invertAxis;
}
QString bbox( QString( ( invertAxis ) ? "%2,%1,%4,%3" : "%1,%2,%3,%4" )
.arg( qgsDoubleToString( mShared->mRect.xMinimum() ),
qgsDoubleToString( mShared->mRect.yMinimum() ),
qgsDoubleToString( mShared->mRect.xMaximum() ),
qgsDoubleToString( mShared->mRect.yMaximum() ) ) );
// Some servers like Geomedia need the srsname to be explicitly appended
// otherwise they are confused and do not interpret it properly
if ( !mShared->mWFSVersion.startsWith( QLatin1String( "1.0" ) ) )
{
// but it is illegal in WFS 1.0 and some servers definitely not like
// it. See #15464
bbox += "," + mShared->srsName();
}
getFeatureUrl.addQueryItem( QStringLiteral( "BBOX" ), bbox );
}
else if ( !mShared->mWFSFilter.isEmpty() )
{
getFeatureUrl.addQueryItem( QStringLiteral( "FILTER" ), sanitizeFilter( mShared->mWFSFilter ) );
}
if ( !mShared->mSortBy.isEmpty() && !forHits )
{
getFeatureUrl.addQueryItem( QStringLiteral( "SORTBY" ), mShared->mSortBy );
}
if ( !forHits && !mShared->mURI.outputFormat().isEmpty() )
{
getFeatureUrl.addQueryItem( QStringLiteral( "OUTPUTFORMAT" ), mShared->mURI.outputFormat() );
}
else if ( !forHits && mShared->mWFSVersion.startsWith( QLatin1String( "1.0" ) ) )
{
QStringList list;
list << QLatin1String( "text/xml; subtype=gml/3.2.1" );
list << QLatin1String( "application/gml+xml; version=3.2" );
list << QLatin1String( "text/xml; subtype=gml/3.1.1" );
list << QLatin1String( "application/gml+xml; version=3.1" );
list << QLatin1String( "text/xml; subtype=gml/3.0.1" );
list << QLatin1String( "application/gml+xml; version=3.0" );
list << QLatin1String( "GML3" );
Q_FOREACH ( const QString &format, list )
{
if ( mShared->mCaps.outputFormats.contains( format ) )
{
getFeatureUrl.addQueryItem( QStringLiteral( "OUTPUTFORMAT" ),
format );
break;
}
}
}
return getFeatureUrl;
}
// Called when we get the response of the asynchronous RESULTTYPE=hits request
void QgsWFSFeatureDownloader::gotHitsResponse()
{
mNumberMatched = mFeatureHitsAsyncRequest.numberMatched();
if ( mNumberMatched >= 0 )
{
if ( mTotalDownloadedFeatureCount == 0 )
{
// We get at this point after the 4 second delay to emit the hits request
// and the delay to get its response. If we don't still have downloaded
// any feature at this point, it is high time to give some visual feedback
mProgressDialogShowImmediately = true;
}
// If the request didn't include any BBOX, then we can update the layer
// feature count
if ( mShared->mRect.isNull() )
mShared->setFeatureCount( mNumberMatched );
}
}
// Starts an asynchronous RESULTTYPE=hits request
void QgsWFSFeatureDownloader::startHitsRequest()
{
// Do a last minute check in case the feature count would have been known in-between
if ( mShared->isFeatureCountExact() && mShared->mRect.isNull() )
mNumberMatched = mShared->getFeatureCount( false );
if ( mNumberMatched < 0 )
{
connect( &mFeatureHitsAsyncRequest, SIGNAL( gotHitsResponse() ), this, SLOT( gotHitsResponse() ) );
mFeatureHitsAsyncRequest.launch( buildURL( 0, -1, true ) );
}
}
void QgsWFSFeatureDownloader::run( bool serializeFeatures, int maxFeatures )
{
bool success = true;
QEventLoop loop;
connect( this, SIGNAL( doStop() ), &loop, SLOT( quit() ) );
connect( this, SIGNAL( downloadFinished() ), &loop, SLOT( quit() ) );
connect( this, SIGNAL( downloadProgress( qint64, qint64 ) ), &loop, SLOT( quit() ) );
QTimer timerForHits;
if ( !mShared->mHideProgressDialog && maxFeatures != 1 && mShared->supportsHits() )
{
Q_FOREACH ( QWidget *widget, qApp->topLevelWidgets() )
{
if ( widget->objectName() == QLatin1String( "QgisApp" ) )
{
mMainWindow = widget;
break;
}
}
}
if ( mMainWindow )
{
// In case the header of the GetFeature response doesn't contain the total
// number of features, or we don't get it within 4 seconds, we will issue
// an explicit RESULTTYPE=hits request.
timerForHits.setInterval( 4 * 1000 );
timerForHits.setSingleShot( true );
timerForHits.start();
connect( &timerForHits, SIGNAL( timeout() ), this, SLOT( startHitsRequest() ) );
connect( &mFeatureHitsAsyncRequest, SIGNAL( downloadFinished() ), &loop, SLOT( quit() ) );
}
bool interrupted = false;
bool truncatedResponse = false;
QgsSettings s;
const int maxRetry = s.value( QStringLiteral( "qgis/defaultTileMaxRetry" ), "3" ).toInt();
int retryIter = 0;
int lastValidTotalDownloadedFeatureCount = 0;
int pagingIter = 1;
QString gmlIdFirstFeatureFirstIter;
bool disablePaging = false;
while ( true )
{
success = true;
QgsGmlStreamingParser *parser = mShared->createParser();
QUrl url( buildURL( mTotalDownloadedFeatureCount,
maxFeatures ? maxFeatures : mShared->mMaxFeatures, false ) );
// Small hack for testing purposes
if ( retryIter > 0 && url.toString().contains( QLatin1String( "fake_qgis_http_endpoint" ) ) )
{
url.addQueryItem( QStringLiteral( "RETRY" ), QString::number( retryIter ) );
}
sendGET( url,
false, /* synchronous */
true, /* forceRefresh */
false /* cache */ );
int featureCountForThisResponse = 0;
while ( true )
{
loop.exec( QEventLoop::ExcludeUserInputEvents );
if ( mStop )
{
interrupted = true;
success = false;
break;
}
if ( mErrorCode != NoError )
{
success = false;
break;
}
QByteArray data;
bool finished = false;
if ( mReply )
{
data = mReply->readAll();
}
else
{
data = mResponse;
finished = true;
}
// Parse the received chunk of data
QString gmlProcessErrorMsg;
if ( !parser->processData( data, finished, gmlProcessErrorMsg ) )
{
success = false;
mErrorMessage = tr( "Error when parsing GetFeature response" ) + " : " + gmlProcessErrorMsg;
QgsMessageLog::logMessage( mErrorMessage, tr( "WFS" ) );
break;
}
if ( parser->isException() && finished )
{
success = false;
// Some GeoServer instances in WFS 2.0 with paging throw an exception
// e.g. http://ows.region-bretagne.fr/geoserver/wfs?SERVICE=WFS&REQUEST=GetFeature&VERSION=2.0.0&TYPENAMES=rb:etudes&STARTINDEX=0&COUNT=1
// Disabling paging helps in those cases
if ( mSupportsPaging && mTotalDownloadedFeatureCount == 0 &&
parser->exceptionText().contains( QLatin1String( "Cannot do natural order without a primary key" ) ) )
{
QgsDebugMsg( QString( "Got exception %1. Re-trying with paging disabled" ).arg( parser->exceptionText() ) );
mSupportsPaging = false;
}
// GeoServer doesn't like typenames prefixed by namespace prefix, despite
// the examples in the WFS 2.0 spec showing that
else if ( !mRemoveNSPrefix && parser->exceptionText().contains( QLatin1String( "more than one feature type" ) ) )
{
QgsDebugMsg( QString( "Got exception %1. Re-trying by removing namespace prefix" ).arg( parser->exceptionText() ) );
mRemoveNSPrefix = true;
}
{
mErrorMessage = tr( "Server generated an exception in GetFeature response" ) + ": " + parser->exceptionText();
QgsMessageLog::logMessage( mErrorMessage, tr( "WFS" ) );
}
break;
}
// Consider if we should display a progress dialog
// We can only do that if we know how many features will be downloaded
if ( !mTimer && maxFeatures != 1 && mMainWindow )
{
if ( mNumberMatched < 0 )
{
// Some servers, like http://demo.opengeo.org/geoserver/wfs?SERVICE=WFS&REQUEST=GetFeature&VERSION=2.0.0&TYPENAMES=ne:ne_10m_admin_0_countries&STARTINDEX=0&COUNT=50&SRSNAME=urn:ogc:def:crs:EPSG::4326&BBOX=-133.04422094925158149,-188.9997780764296067,126.67820349384365386,188.99999458723010548,
// return numberMatched="unknown" for all pages, except the last one, where
// this is (erroneously?) the number of features returned
if ( parser->numberMatched() > 0 && mTotalDownloadedFeatureCount == 0 )
mNumberMatched = parser->numberMatched();
// The number returned can only be used if we aren't in paging mode
else if ( parser->numberReturned() > 0 && !mSupportsPaging )
mNumberMatched = parser->numberMatched();
// We can only use the layer feature count if we don't apply a BBOX
else if ( mShared->isFeatureCountExact() && mShared->mRect.isNull() )
mNumberMatched = mShared->getFeatureCount( false );
// If we didn't get a valid mNumberMatched, we will possibly issue
// a explicit RESULTTYPE=hits request 4 second after the beginning of
// the download
}
if ( mNumberMatched > 0 )
{
if ( mShared->supportsHits() )
disconnect( &timerForHits, SIGNAL( timeout() ), this, SLOT( startHitsRequest() ) );
// This is a bit tricky. We want the createProgressDialog()
// method to be run into the GUI thread
mTimer = new QTimer();
mTimer->setSingleShot( true );
// Direct connection, since we want createProgressDialog()
// to be invoked from the same thread as timer, and not in the
// thread of this
connect( mTimer, SIGNAL( timeout() ), this, SLOT( createProgressDialog() ), Qt::DirectConnection );
mTimer->moveToThread( mMainWindow->thread() );
QMetaObject::invokeMethod( mTimer, "start", Qt::QueuedConnection );
}
}
QVector<QgsGmlStreamingParser::QgsGmlFeaturePtrGmlIdPair> featurePtrList =
parser->getAndStealReadyFeatures();
mTotalDownloadedFeatureCount += featurePtrList.size();
if ( !mStop )
{
emit updateProgress( mTotalDownloadedFeatureCount );
}
if ( featurePtrList.size() != 0 )
{
// Heuristics to try to detect MapServer WFS 1.1 that honours EPSG axis order, but returns
// EPSG:XXXX srsName and not EPSG urns
if ( pagingIter == 1 && featureCountForThisResponse == 0 &&
mShared->mWFSVersion.startsWith( QLatin1String( "1.1" ) ) &&
parser->srsName().startsWith( QLatin1String( "EPSG:" ) ) &&
!parser->layerExtent().isNull() &&
!mShared->mURI.ignoreAxisOrientation() &&
!mShared->mURI.invertAxisOrientation() )
{
QgsCoordinateReferenceSystem crs = QgsCoordinateReferenceSystem::fromOgcWmsCrs( parser->srsName() );
if ( crs.isValid() && crs.hasAxisInverted() &&
!mShared->mCapabilityExtent.contains( parser->layerExtent() ) )
{
QgsRectangle invertedRectangle( parser->layerExtent() );
invertedRectangle.invert();
if ( mShared->mCapabilityExtent.contains( invertedRectangle ) )
{
mShared->mGetFeatureEPSGDotHonoursEPSGOrder = true;
QgsDebugMsg( "Server is likely MapServer. Using mGetFeatureEPSGDotHonoursEPSGOrder mode" );
}
}
}
QVector<QgsWFSFeatureGmlIdPair> featureList;
for ( int i = 0; i < featurePtrList.size(); i++ )
{
QgsGmlStreamingParser::QgsGmlFeaturePtrGmlIdPair &featPair = featurePtrList[i];
QgsFeature &f = *( featPair.first );
QString gmlId( featPair.second );
if ( gmlId.isEmpty() )
{
// Should normally not happen on sane WFS sources, but can happen with
// Geomedia
gmlId = QgsWFSUtils::getMD5( f );
if ( !mShared->mHasWarnedAboutMissingFeatureId )
{
QgsDebugMsg( "Server returns features without fid/gml:id. Computing a fake one using feature attributes" );
mShared->mHasWarnedAboutMissingFeatureId = true;
}
}
if ( pagingIter == 1 && featureCountForThisResponse == 0 )
{
gmlIdFirstFeatureFirstIter = gmlId;
}
else if ( pagingIter == 2 && featureCountForThisResponse == 0 && gmlIdFirstFeatureFirstIter == gmlId )
{
disablePaging = true;
QgsDebugMsg( "Server does not seem to properly support paging since it returned the same first feature for 2 different page requests. Disabling paging" );
}
if ( mShared->mGetFeatureEPSGDotHonoursEPSGOrder && f.hasGeometry() )
{
QgsGeometry g = f.geometry();
g.transform( QTransform( 0, 1, 1, 0, 0, 0 ) );
f.setGeometry( g );
}
featureList.push_back( QgsWFSFeatureGmlIdPair( f, gmlId ) );
delete featPair.first;
if ( ( i > 0 && ( i % 1000 ) == 0 ) || i + 1 == featurePtrList.size() )
{
// We call it directly to avoid asynchronous signal notification, and
// as serializeFeatures() can modify the featureList to remove features
// that have already been cached, so as to avoid to notify them several
// times to subscribers
if ( serializeFeatures )
mShared->serializeFeatures( featureList );
if ( !featureList.isEmpty() )
{
emit featureReceived( featureList );
emit featureReceived( featureList.size() );
}
featureList.clear();
}
featureCountForThisResponse ++;
}
}
if ( finished )
{
if ( parser->isTruncatedResponse() && !mSupportsPaging )
{
// e.g: http://services.cuzk.cz/wfs/inspire-cp-wfs.asp?SERVICE=WFS&REQUEST=GetFeature&VERSION=2.0.0&TYPENAMES=cp:CadastralParcel
truncatedResponse = true;
}
break;
}
}
delete parser;
if ( mStop )
break;
if ( !success )
{
if ( ++retryIter <= maxRetry )
{
QgsMessageLog::logMessage( tr( "Retrying request %1: %2/%3" ).arg( url.toString() ).arg( retryIter ).arg( maxRetry ), tr( "WFS" ) );
featureCountForThisResponse = 0;
mTotalDownloadedFeatureCount = lastValidTotalDownloadedFeatureCount;
continue;
}
break;
}
retryIter = 0;
lastValidTotalDownloadedFeatureCount = mTotalDownloadedFeatureCount;
if ( !mSupportsPaging )
break;
if ( maxFeatures == 1 )
break;
// Detect if we are at the last page
if ( ( mShared->mMaxFeatures > 0 && featureCountForThisResponse < mShared->mMaxFeatures ) || featureCountForThisResponse == 0 )
break;
++ pagingIter;
if ( disablePaging )
{
mSupportsPaging = mShared->mCaps.supportsPaging = false;
mTotalDownloadedFeatureCount = 0;
if ( mShared->mMaxFeaturesWasSetFromDefaultForPaging )
{
mShared->mMaxFeatures = 0;
}
}
}
mStop = true;
if ( serializeFeatures )
mShared->endOfDownload( success, mTotalDownloadedFeatureCount, truncatedResponse, interrupted, mErrorMessage );
// We must emit the signal *AFTER* the previous call to mShared->endOfDownload()
// to avoid issues with iterators that would start just now, wouldn't detect
// that the downloader has finished, would register to itself, but would never
// receive the endOfDownload signal. This is not just a theoretical problem.
// If you switch both calls, it happens quite easily in Release mode with the
// test suite.
emit endOfDownload( success );
if ( mProgressDialog )
{
mProgressDialog->deleteLater();
mProgressDialog = nullptr;
}
if ( mTimer )
{
mTimer->deleteLater();
mTimer = nullptr;
}
// explicitly abort here so that mReply is destroyed within the right thread
// otherwise will deadlock because deleteLayer() will not have a valid thread to post
abort();
mFeatureHitsAsyncRequest.abort();
}
QString QgsWFSFeatureDownloader::errorMessageWithReason( const QString &reason )
{
return tr( "Download of features failed: %1" ).arg( reason );
}
QgsWFSThreadedFeatureDownloader::QgsWFSThreadedFeatureDownloader( QgsWFSSharedData *shared )
: mShared( shared )
, mDownloader( nullptr )
{
}
QgsWFSThreadedFeatureDownloader::~QgsWFSThreadedFeatureDownloader()
{
stop();
}
void QgsWFSThreadedFeatureDownloader::stop()
{
if ( mDownloader )
{
mDownloader->stop();
wait();
delete mDownloader;
mDownloader = nullptr;
}
}
void QgsWFSThreadedFeatureDownloader::run()
{
// We need to construct it in the run() method (i.e. in the new thread)
mDownloader = new QgsWFSFeatureDownloader( mShared );
emit ready();
mDownloader->run( true, /* serialize features */
0 /* user max features */ );
}
// -------------------------
QgsWFSFeatureIterator::QgsWFSFeatureIterator( QgsWFSFeatureSource *source,
bool ownSource,
const QgsFeatureRequest &request )
: QgsAbstractFeatureIteratorFromSource<QgsWFSFeatureSource>( source, ownSource, request )
, mShared( source->mShared )
, mDownloadFinished( false )
, mLoop( nullptr )
, mInterruptionChecker( nullptr )
, mCounter( 0 )
, mWriteTransferThreshold( 1024 * 1024 )
, mWriterFile( nullptr )
, mWriterStream( nullptr )
, mReaderFile( nullptr )
, mReaderStream( nullptr )
, mFetchGeometry( false )
{
// Configurable for the purpose of unit tests
QString threshold( getenv( "QGIS_WFS_ITERATOR_TRANSFER_THRESHOLD" ) );
if ( !threshold.isEmpty() )
mWriteTransferThreshold = threshold.toInt();
int genCounter = ( mShared->mURI.isRestrictedToRequestBBOX() && !request.filterRect().isNull() ) ?
mShared->registerToCache( this, request.filterRect() ) : mShared->registerToCache( this );
mDownloadFinished = genCounter < 0;
if ( !mShared->mCacheDataProvider )
return;
QgsDebugMsg( QString( "QgsWFSFeatureIterator::constructor(): genCounter=%1 " ).arg( genCounter ) );
QgsFeatureRequest requestCache;
if ( mRequest.filterType() == QgsFeatureRequest::FilterFid ||
mRequest.filterType() == QgsFeatureRequest::FilterFids )
requestCache = mRequest;
else
{
if ( mRequest.filterType() == QgsFeatureRequest::FilterExpression )
{
requestCache.setFilterExpression( mRequest.filterExpression()->expression() );
}
if ( genCounter >= 0 )
{
requestCache.combineFilterExpression( QString( QgsWFSConstants::FIELD_GEN_COUNTER + " <= %1" ).arg( genCounter ) );
}
}
requestCache.setFilterRect( mRequest.filterRect() );
if ( !( mRequest.flags() & QgsFeatureRequest::NoGeometry ) ||
( mRequest.filterType() == QgsFeatureRequest::FilterExpression && mRequest.filterExpression()->needsGeometry() ) )
{
mFetchGeometry = true;
}
if ( mRequest.flags() & QgsFeatureRequest::SubsetOfAttributes )
{
QgsFields dataProviderFields = mShared->mCacheDataProvider->fields();
QgsAttributeList cacheSubSet;
Q_FOREACH ( int i, mRequest.subsetOfAttributes() )
{
int idx = dataProviderFields.indexFromName( mShared->mFields.at( i ).name() );
if ( idx >= 0 )
cacheSubSet.append( idx );
idx = mShared->mFields.indexFromName( mShared->mFields.at( i ).name() );
if ( idx >= 0 )
mSubSetAttributes.append( idx );
}
// ensure that all attributes required for expression filter are being fetched
if ( mRequest.filterType() == QgsFeatureRequest::FilterExpression )
{
Q_FOREACH ( const QString &field, mRequest.filterExpression()->referencedColumns() )
{
int idx = dataProviderFields.indexFromName( field );
if ( idx >= 0 && !cacheSubSet.contains( idx ) )
cacheSubSet.append( idx );
idx = mShared->mFields.indexFromName( field );
if ( idx >= 0 && !mSubSetAttributes.contains( idx ) )
mSubSetAttributes.append( idx );
}
}
if ( mFetchGeometry )
{
int hexwkbGeomIdx = dataProviderFields.indexFromName( QgsWFSConstants::FIELD_HEXWKB_GEOM );
Q_ASSERT( hexwkbGeomIdx >= 0 );
cacheSubSet.append( hexwkbGeomIdx );
}
requestCache.setSubsetOfAttributes( cacheSubSet );
}
mCacheIterator = mShared->mCacheDataProvider->getFeatures( requestCache );
}
QgsWFSFeatureIterator::~QgsWFSFeatureIterator()
{
QgsDebugMsg( QString( "qgsWFSFeatureIterator::~QgsWFSFeatureIterator()" ) );
close();
QMutexLocker locker( &mMutex );
if ( mWriterStream )
{
delete mWriterStream;
delete mWriterFile;
if ( !mWriterFilename.isEmpty() )
QFile::remove( mWriterFilename );
}
if ( mReaderStream )
{
delete mReaderStream;
delete mReaderFile;
if ( !mReaderFilename.isEmpty() )
QFile::remove( mReaderFilename );
}
}
void QgsWFSFeatureIterator::connectSignals( QObject *downloader )
{
// We want to run the slot for that signal in the same thread as the sender
// so as to avoid the list of features to accumulate without control in
// memory
connect( downloader, SIGNAL( featureReceived( QVector<QgsWFSFeatureGmlIdPair> ) ),
this, SLOT( featureReceivedSynchronous( QVector<QgsWFSFeatureGmlIdPair> ) ), Qt::DirectConnection );
connect( downloader, SIGNAL( featureReceived( int ) ),
this, SLOT( featureReceived( int ) ) );
connect( downloader, SIGNAL( endOfDownload( bool ) ),
this, SLOT( endOfDownload( bool ) ) );
}
void QgsWFSFeatureIterator::endOfDownload( bool )
{
mDownloadFinished = true;
if ( mLoop )
mLoop->quit();
}
void QgsWFSFeatureIterator::setInterruptionChecker( QgsInterruptionChecker *interruptionChecker )
{
mInterruptionChecker = interruptionChecker;
}
// This method will serialize the receive feature list, first into memory, and
// if it goes above a given threshold, on disk
void QgsWFSFeatureIterator::featureReceivedSynchronous( const QVector<QgsWFSFeatureGmlIdPair> &list )
{
QgsDebugMsg( QString( "QgsWFSFeatureIterator::featureReceivedSynchronous %1 features" ).arg( list.size() ) );
QMutexLocker locker( &mMutex );
if ( !mWriterStream )
{
mWriterStream = new QDataStream( &mWriterByteArray, QIODevice::WriteOnly );
}
Q_FOREACH ( const QgsWFSFeatureGmlIdPair &pair, list )
{
*mWriterStream << pair.first;
}
if ( !mWriterFile && mWriterByteArray.size() > mWriteTransferThreshold )
{
QString thisStr;
thisStr.sprintf( "%p", this );
++ mCounter;
mWriterFilename = QDir( QgsWFSUtils::acquireCacheDirectory() ).filePath( QStringLiteral( "iterator_%1_%2.bin" ).arg( thisStr ).arg( mCounter ) );
QgsDebugMsg( QString( "Transferring feature iterator cache to %1" ).arg( mWriterFilename ) );
mWriterFile = new QFile( mWriterFilename );
if ( !mWriterFile->open( QIODevice::WriteOnly | QIODevice::Truncate ) )
{
QgsDebugMsg( QString( "Cannot open %1 for writing" ).arg( mWriterFilename ) );
delete mWriterFile;
mWriterFile = nullptr;
return;
}
mWriterFile->write( mWriterByteArray );
mWriterByteArray.clear();
mWriterStream->setDevice( mWriterFile );
}
}
// This will invoked asynchronously, in the thread of QgsWFSFeatureIterator
// hence it is safe to quite the loop
void QgsWFSFeatureIterator::featureReceived( int /*featureCount*/ )
{
//QgsDebugMsg( QString("QgsWFSFeatureIterator::featureReceived %1 features").arg(featureCount) );
if ( mLoop )
mLoop->quit();
}
void QgsWFSFeatureIterator::checkInterruption()
{
//QgsDebugMsg("QgsWFSFeatureIterator::checkInterruption()");
if ( mInterruptionChecker && mInterruptionChecker->mustStop() )
{
mDownloadFinished = true;
if ( mLoop )
mLoop->quit();
}
}
bool QgsWFSFeatureIterator::fetchFeature( QgsFeature &f )
{
f.setValid( false );
if ( mClosed )
return false;
// First step is to iterate over the on-disk cache
QgsFeature cachedFeature;
while ( mCacheIterator.nextFeature( cachedFeature ) )
{
if ( mInterruptionChecker && mInterruptionChecker->mustStop() )
return false;
//QgsDebugMsg(QString("QgsWFSSharedData::fetchFeature() : mCacheIterator.nextFeature(cachedFeature)") );
if ( !mShared->mGeometryAttribute.isEmpty() && mFetchGeometry )
{
int idx = cachedFeature.fields().indexFromName( QgsWFSConstants::FIELD_HEXWKB_GEOM );
Q_ASSERT( idx >= 0 );
const QVariant &v = cachedFeature.attributes().value( idx );
if ( !v.isNull() && v.type() == QVariant::String )
{
QByteArray wkbGeom( QByteArray::fromHex( v.toString().toLatin1() ) );
QgsGeometry g;
unsigned char *wkbClone = new unsigned char[wkbGeom.size()];
memcpy( wkbClone, wkbGeom.data(), wkbGeom.size() );
try
{