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qgis_mapserver.cpp
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qgis_mapserver.cpp
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/***************************************************************************
qgs_mapserver.cpp
A QGIS development HTTP server for testing/development purposes.
The server listens to localhost:8000, the address and port can be changed with the
environment variable QGIS_SERVER_ADDRESS and QGIS_SERVER_PORT or passing <address>:<port>
on the command line.
All requests and application messages are printed to the standard output,
while QGIS server internal logging is printed to stderr.
-------------------
begin : Jan 17 2020
copyright : (C) 2020by Alessandro Pasotti
email : elpaso at itopen dot it
***************************************************************************/
/***************************************************************************
* *
* 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 <thread>
//for CMAKE_INSTALL_PREFIX
#include "qgsconfig.h"
#include "qgsserver.h"
#include "qgsbufferserverrequest.h"
#include "qgsbufferserverresponse.h"
#include "qgsapplication.h"
#include "qgsmessagelog.h"
#include <QFontDatabase>
#include <QString>
#include <QTcpServer>
#include <QTcpSocket>
#include <QNetworkInterface>
#include <QCommandLineParser>
#include <QObject>
#ifndef Q_OS_WIN
#include <csignal>
#endif
#include <string>
#include <chrono>
///@cond PRIVATE
// For the signal exit handler
QAtomicInt IS_RUNNING = 1;
/**
* The HttpException class represents an HTTP parsing exception.
*/
class HttpException: public std::exception
{
public:
/**
* Constructs an HttpException with the given \a message
*/
HttpException( const QString &message )
: mMessage( message )
{
}
/**
* Returns the exception message.
*/
QString message( )
{
return mMessage;
}
private:
QString mMessage;
};
int main( int argc, char *argv[] )
{
// Test if the environ variable DISPLAY is defined
// if it's not, the server is running in offscreen mode
// Qt supports using various QPA (Qt Platform Abstraction) back ends
// for rendering. You can specify the back end to use with the environment
// variable QT_QPA_PLATFORM when invoking a Qt-based application.
// Available platform plugins are: directfbegl, directfb, eglfs, linuxfb,
// minimal, minimalegl, offscreen, wayland-egl, wayland, xcb.
// https://www.ics.com/blog/qt-tips-and-tricks-part-1
// http://doc.qt.io/qt-5/qpa.html
const QString display { qgetenv( "DISPLAY" ) };
bool withDisplay = true;
if ( display.isEmpty() )
{
withDisplay = false;
qputenv( "QT_QPA_PLATFORM", "offscreen" );
}
// since version 3.0 QgsServer now needs a qApp so initialize QgsApplication
QgsApplication app( argc, argv, withDisplay, QString(), QStringLiteral( "QGIS Development Server" ) );
QCoreApplication::setOrganizationName( QgsApplication::QGIS_ORGANIZATION_NAME );
QCoreApplication::setOrganizationDomain( QgsApplication::QGIS_ORGANIZATION_DOMAIN );
QCoreApplication::setApplicationName( "QGIS Development Server" );
QCoreApplication::setApplicationVersion( VERSION );
if ( ! withDisplay )
{
QgsMessageLog::logMessage( "DISPLAY environment variable is not set, running in offscreen mode, all printing capabilities will not be available.\n"
"Consider installing an X server like 'xvfb' and export DISPLAY to the actual display value.", "Server", Qgis::Warning );
}
#ifdef Q_OS_WIN
// Initialize font database before fcgi_accept.
// When using FCGI with IIS, environment variables (QT_QPA_FONTDIR in this case) are lost after fcgi_accept().
QFontDatabase fontDB;
#endif
// The port to listen
QString serverPort { qgetenv( "QGIS_SERVER_PORT" ) };
// The address to listen
QString ipAddress { qgetenv( "QGIS_SERVER_ADDRESS" ) };
if ( serverPort.isEmpty() )
{
serverPort = QStringLiteral( "8000" );
}
if ( ipAddress.isEmpty() )
{
ipAddress = QStringLiteral( "localhost" );
}
QCommandLineParser parser;
parser.setApplicationDescription( QObject::tr( "QGIS Development Server %1" ).arg( VERSION ) );
parser.addHelpOption();
parser.addVersionOption();
parser.addPositionalArgument( QStringLiteral( "addressAndPort" ),
QObject::tr( "Address and port (default: \"localhost:8000\")\n"
"address and port can also be specified with the environment\n"
"variables QGIS_SERVER_ADDRESS and QGIS_SERVER_PORT." ), QStringLiteral( "[address:port]" ) );
QCommandLineOption logLevelOption( "l", QObject::tr( "Log level (default: 0)\n"
"0: INFO\n"
"1: WARNING\n"
"2: CRITICAL" ), "logLevel", "0" );
parser.addOption( logLevelOption );
QCommandLineOption projectOption( "p", QObject::tr( "Path to a QGIS project file (*.qgs or *.qgz),\n"
"if specified it will override the query string MAP argument\n"
"and the QGIS_PROJECT_FILE environment variable." ), "projectPath", "" );
parser.addOption( projectOption );
parser.process( app );
const QStringList args = parser.positionalArguments();
if ( args.size() == 1 )
{
QStringList addressAndPort { args.at( 0 ).split( ':' ) };
if ( addressAndPort.size() == 2 )
{
ipAddress = addressAndPort.at( 0 );
serverPort = addressAndPort.at( 1 );
}
}
QString logLevel = parser.value( logLevelOption );
qunsetenv( "QGIS_SERVER_LOG_FILE" );
qputenv( "QGIS_SERVER_LOG_LEVEL", logLevel.toUtf8() );
qputenv( "QGIS_SERVER_LOG_STDERR", "1" );
if ( ! parser.value( projectOption ).isEmpty( ) )
{
// Check it!
const QString projectFilePath { parser.value( projectOption ) };
if ( ! QFile::exists( projectFilePath ) )
{
std::cout << QObject::tr( "Project file not found, the option will be ignored." ).toStdString() << std::endl;
}
else
{
qputenv( "QGIS_PROJECT_FILE", projectFilePath.toUtf8() );
}
}
// Disable parallel rendering because if its internal loop
//qputenv( "QGIS_SERVER_PARALLEL_RENDERING", "0" );
// Create server
QTcpServer tcpServer;
QHostAddress address { QHostAddress::AnyIPv4 };
address.setAddress( ipAddress );
if ( ! tcpServer.listen( address, serverPort.toInt( ) ) )
{
std::cerr << QObject::tr( "Unable to start the server: %1." )
.arg( tcpServer.errorString() ).toStdString() << std::endl;
tcpServer.close();
app.exitQgis();
return 1;
}
else
{
const int port { tcpServer.serverPort() };
QAtomicInt connCounter { 0 };
static const QMap<int, QString> knownStatuses
{
{ 200, QStringLiteral( "OK" ) },
{ 201, QStringLiteral( "Created" ) },
{ 202, QStringLiteral( "Accepted" ) },
{ 204, QStringLiteral( "No Content" ) },
{ 301, QStringLiteral( "Moved Permanently" ) },
{ 302, QStringLiteral( "Moved Temporarily" ) },
{ 304, QStringLiteral( "Not Modified" ) },
{ 400, QStringLiteral( "Bad Request" ) },
{ 401, QStringLiteral( "Unauthorized" ) },
{ 403, QStringLiteral( "Forbidden" ) },
{ 404, QStringLiteral( "Not Found" ) },
{ 500, QStringLiteral( "Internal Server Error" ) },
{ 501, QStringLiteral( "Not Implemented" ) },
{ 502, QStringLiteral( "Bad Gateway" ) },
{ 503, QStringLiteral( "Service Unavailable" ) }
};
QgsServer server;
#ifdef HAVE_SERVER_PYTHON_PLUGINS
server.initPython();
#endif
std::cout << QObject::tr( "QGIS Development Server listening on http://%1:%2" )
.arg( ipAddress ).arg( port ).toStdString() << std::endl;
#ifndef Q_OS_WIN
std::cout << QObject::tr( "CTRL+C to exit" ).toStdString() << std::endl;
#endif
// Poor man's synchronous HTTP handler
// The reason why this cannot be implemented using signals is that
// WMS provider (and probably others) run its own event loop and this
// crashes in case the project contains a WMS layer (aka: cascading)
auto httpHandler = [ & ]( QTcpSocket * clientConnection )
{
connCounter++;
//qDebug() << clientConnection << "Active connection" << connCounter;
QString incomingData;
// Incoming connection parser
while ( IS_RUNNING && clientConnection->state() == QAbstractSocket::SocketState::ConnectedState )
{
if ( ! clientConnection->bytesAvailable() )
{
qApp->processEvents();
continue;
}
// Read all incoming data
while ( IS_RUNNING && clientConnection->bytesAvailable() > 0 )
{
incomingData.append( clientConnection->readAll() );
}
try
{
// Parse protocol and URL GET /path HTTP/1.1
int firstLinePos { incomingData.indexOf( "\r\n" ) };
if ( firstLinePos == -1 )
{
throw HttpException( QStringLiteral( "HTTP error finding protocol header" ) );
}
const QString firstLine { incomingData.left( firstLinePos ) };
const QStringList firstLinePieces { firstLine.split( ' ' ) };
if ( firstLinePieces.size() != 3 )
{
throw HttpException( QStringLiteral( "HTTP error splitting protocol header" ) );
}
const QString methodString { firstLinePieces.at( 0 ) };
QgsServerRequest::Method method;
if ( methodString == "GET" )
{
method = QgsServerRequest::Method::GetMethod;
}
else if ( methodString == "POST" )
{
method = QgsServerRequest::Method::PostMethod;
}
else if ( methodString == "HEAD" )
{
method = QgsServerRequest::Method::HeadMethod;
}
else if ( methodString == "PUT" )
{
method = QgsServerRequest::Method::PutMethod;
}
else if ( methodString == "PATCH" )
{
method = QgsServerRequest::Method::PatchMethod;
}
else if ( methodString == "DELETE" )
{
method = QgsServerRequest::Method::DeleteMethod;
}
else
{
throw HttpException( QStringLiteral( "HTTP error unsupported method: %1" ).arg( methodString ) );
}
const QString protocol { firstLinePieces.at( 2 )};
if ( protocol != QLatin1String( "HTTP/1.0" ) && protocol != QLatin1String( "HTTP/1.1" ) )
{
throw HttpException( QStringLiteral( "HTTP error unsupported protocol: %1" ).arg( protocol ) );
}
// Headers
QgsBufferServerRequest::Headers headers;
int endHeadersPos { incomingData.indexOf( "\r\n\r\n" ) };
if ( endHeadersPos == -1 )
{
throw HttpException( QStringLiteral( "HTTP error finding headers" ) );
}
const QStringList httpHeaders { incomingData.mid( firstLinePos + 2, endHeadersPos - firstLinePos ).split( "\r\n" ) };
for ( const auto &headerLine : httpHeaders )
{
const int headerColonPos { headerLine.indexOf( ':' ) };
if ( headerColonPos > 0 )
{
headers.insert( headerLine.left( headerColonPos ), headerLine.mid( headerColonPos + 2 ) );
}
}
const int headersSize { endHeadersPos + 4 };
// Check for content length and if we have got all data
if ( headers.contains( QStringLiteral( "Content-Length" ) ) )
{
bool ok;
const int contentLength { headers.value( QStringLiteral( "Content-Length" ) ).toInt( &ok ) };
if ( ok && contentLength > incomingData.length() - headersSize )
{
break;
}
}
// At this point we should have read all data:
// Build URL from env ...
QString url { qgetenv( "REQUEST_URI" ) };
// ... or from server ip/port and request path
if ( url.isEmpty() )
{
const QString path { firstLinePieces.at( 1 )};
// Take Host header if defined
if ( headers.contains( QStringLiteral( "Host" ) ) )
{
url = QStringLiteral( "http://%1%2" ).arg( headers.value( QStringLiteral( "Host" ) ), path );
}
else
{
url = QStringLiteral( "http://%1:%2%3" ).arg( ipAddress ).arg( port ).arg( path );
}
}
// Inefficient copy :(
QByteArray data { incomingData.mid( headersSize ).toUtf8() };
auto start = std::chrono::steady_clock::now();
QgsBufferServerRequest request { url, method, headers, &data };
QgsBufferServerResponse response;
server.handleRequest( request, response );
// The QGIS server machinery calls processEvents and has internal loop events
// that might change the connection state
if ( clientConnection->state() != QAbstractSocket::SocketState::ConnectedState )
{
break;
}
auto elapsedTime { std::chrono::steady_clock::now() - start };
if ( ! knownStatuses.contains( response.statusCode() ) )
{
throw HttpException( QStringLiteral( "HTTP error unsupported status code: %1" ).arg( response.statusCode() ) );
}
// Output stream
clientConnection->write( QStringLiteral( "HTTP/1.0 %1 %2\r\n" ).arg( response.statusCode() ).arg( knownStatuses.value( response.statusCode() ) ).toUtf8() );
clientConnection->write( QStringLiteral( "Server: QGIS\r\n" ).toUtf8() );
const auto responseHeaders { response.headers() };
for ( auto it = responseHeaders.constBegin(); it != responseHeaders.constEnd(); ++it )
{
clientConnection->write( QStringLiteral( "%1: %2\r\n" ).arg( it.key(), it.value() ).toUtf8() );
}
clientConnection->write( "\r\n" );
const QByteArray body { response.body() };
clientConnection->write( body );
// 10.185.248.71 [09/Jan/2015:19:12:06 +0000] 808840 <time> "GET / HTTP/1.1" 500"
std::cout << QStringLiteral( "\033[1;92m%1 [%2] %3 %4ms \"%5\" %6\033[0m" )
.arg( clientConnection->peerAddress().toString(),
QDateTime::currentDateTime().toString(),
QString::number( body.size() ),
QString::number( std::chrono::duration_cast<std::chrono::milliseconds>( elapsedTime ).count() ),
firstLinePieces.join( ' ' ),
QString::number( response.statusCode() ) )
.toStdString()
<< std::endl;
clientConnection->disconnectFromHost();
}
catch ( HttpException &ex )
{
if ( clientConnection->state() != QAbstractSocket::SocketState::ConnectedState )
{
break;
}
// Output stream: send error
clientConnection->write( QStringLiteral( "HTTP/1.0 %1 %2\r\n" ).arg( 500 ).arg( knownStatuses.value( 500 ) ).toUtf8() );
clientConnection->write( QStringLiteral( "Server: QGIS\r\n" ).toUtf8() );
clientConnection->write( "\r\n" );
clientConnection->write( ex.message().toUtf8() );
std::cout << QStringLiteral( "\033[1;31m%1 [%2] \"%3\" - - 500\033[0m" )
.arg( clientConnection->peerAddress().toString() )
.arg( QDateTime::currentDateTime().toString() )
.arg( ex.message() ).toStdString() << std::endl;
clientConnection->disconnectFromHost();
}
};
clientConnection->deleteLater();
connCounter--;
};
// Starts HTTP handler loop
QTimer::singleShot( 0, [ & ]
{
while ( IS_RUNNING )
{
if ( tcpServer.hasPendingConnections() )
{
QTcpSocket *clientConnection = tcpServer.nextPendingConnection();
if ( clientConnection )
{
httpHandler( clientConnection );
}
}
else
{
qApp->processEvents( );
std::this_thread::sleep_for( std::chrono::milliseconds( 1 ) );
}
}
} );
}
// Exit handlers
#ifndef Q_OS_WIN
auto exitHandler = [ ]( int signal )
{
std::cout << QStringLiteral( "Signal %1 received: quitting" ).arg( signal ).toStdString() << std::endl;
IS_RUNNING = 0;
qApp->quit( );
};
signal( SIGTERM, exitHandler );
signal( SIGABRT, exitHandler );
signal( SIGINT, exitHandler );
signal( SIGPIPE, [ ]( int )
{
std::cerr << QStringLiteral( "Signal SIGPIPE received: ignoring" ).toStdString() << std::endl;
} );
#endif
app.exec();
app.exitQgis();
return 0;
}
/// @endcond