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qgshttptransaction.cpp
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qgshttptransaction.cpp
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/***************************************************************************
qgshttptransaction.cpp - Tracks a HTTP request with its response,
with particular attention to tracking
HTTP redirect responses
-------------------
begin : 17 Mar, 2005
copyright : (C) 2005 by Brendan Morley
email : morb at ozemail dot com dot au
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
/* $Id: qgshttptransaction.cpp 5697 2006-08-15 10:29:46Z morb_au $ */
#include <fstream>
#include <iostream>
#include "qgshttptransaction.h"
#include "qgslogger.h"
#include <QApplication>
#include <QUrl>
#include <QTimer>
static int NETWORK_TIMEOUT_MSEC = (120 * 1000); // 120 seconds
static int HTTP_PORT_DEFAULT = 80;
QgsHttpTransaction::QgsHttpTransaction(QString uri,
QString proxyHost,
int proxyPort,
QString proxyUser,
QString proxyPass)
: httpresponsecontenttype(0),
httpurl(uri),
httphost(proxyHost),
httpport(proxyPort),
httpuser(proxyUser),
httppass(proxyPass),
mError(0)
{
QgsDebugMsg("QgsHttpTransaction: constructing.");
QgsDebugMsg(" QgsHttpTransaction: proxyHost = " + proxyHost + ".");
QgsDebugMsg(" QgsHttpTransaction: proxyPort = " + QString::number(proxyPort) + ".");
QgsDebugMsg(" QgsHttpTransaction: proxyUser = " + proxyUser + ".");
QgsDebugMsg(" QgsHttpTransaction: proxyPass = " + proxyPass + ".");
QgsDebugMsg("QgsHttpTransaction: exiting constructor.");
}
QgsHttpTransaction::~QgsHttpTransaction()
{
QgsDebugMsg("QgsHttpTransaction: deconstructing.");
}
void QgsHttpTransaction::getAsynchronously()
{
//TODO
}
bool QgsHttpTransaction::getSynchronously(QByteArray &respondedContent, int redirections)
{
httpredirections = redirections;
QgsDebugMsg("QgsHttpTransaction::getSynchronously: Entered.");
QgsDebugMsg("QgsHttpTransaction::getSynchronously: Using '" + httpurl + "'.");
QUrl qurl(httpurl);
http = new QHttp( qurl.host(), qurl.port(HTTP_PORT_DEFAULT) );
if (httphost.isEmpty())
{
// No proxy was specified - connect directly to host in URI
httphost = qurl.host();
httpport = qurl.port(HTTP_PORT_DEFAULT);
}
else
{
// Insert proxy username and password authentication
http->setProxy( httphost, httpport, httpuser, httppass );
}
// int httpid1 = http->setHost( qurl.host(), qurl.port() );
mWatchdogTimer = new QTimer( this );
QgsDebugMsg("QgsHttpTransaction::getSynchronously: qurl.host() is '" + qurl.host()+ "'.");
httpresponse.truncate(0);
// Some WMS servers don't like receiving a http request that
// includes the scheme, host and port (the
// http://www.address.bit:80), so remove that from the url before
// executing an http GET.
QString pathAndQuery = httpurl.remove(0,
httpurl.indexOf(qurl.path()));
httpid = http->get( pathAndQuery );
connect(http, SIGNAL( requestStarted ( int ) ),
this, SLOT( dataStarted ( int ) ) );
connect(http, SIGNAL( responseHeaderReceived( const QHttpResponseHeader& ) ),
this, SLOT( dataHeaderReceived( const QHttpResponseHeader& ) ) );
connect(http, SIGNAL( readyRead( const QHttpResponseHeader& ) ),
this, SLOT( dataReceived( const QHttpResponseHeader& ) ) );
connect(http, SIGNAL( dataReadProgress ( int, int ) ),
this, SLOT( dataProgress ( int, int ) ) );
connect(http, SIGNAL( requestFinished ( int, bool ) ),
this, SLOT( dataFinished ( int, bool ) ) );
connect(http, SIGNAL( done ( bool ) ),
this, SLOT( transactionFinished ( bool ) ) );
connect(http, SIGNAL( stateChanged ( int ) ),
this, SLOT( dataStateChanged ( int ) ) );
// Set up the watchdog timer
connect(mWatchdogTimer, SIGNAL( timeout () ),
this, SLOT( networkTimedOut () ) );
mWatchdogTimer->setSingleShot(TRUE);
mWatchdogTimer->start(NETWORK_TIMEOUT_MSEC);
QgsDebugMsg("QgsHttpTransaction::getSynchronously: Starting get with id " + QString::number(httpid) + ".");
QgsDebugMsg("QgsHttpTransaction::getSynchronously: Setting httpactive = TRUE");
// let the user know we're going to possibly be taking a while
QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
httpactive = TRUE;
// A little trick to make this function blocking
while ( httpactive )
{
// Do something else, maybe even network processing events
qApp->processEvents(QEventLoop::ExcludeUserInputEvents);
}
QApplication::restoreOverrideCursor();
#ifdef QGISDEBUG
QgsDebugMsg("QgsHttpTransaction::getSynchronously: Response received.");
// QString httpresponsestring(httpresponse);
// QgsDebugMsg("QgsHttpTransaction::getSynchronously: Response received; being '" + httpresponsestring + "'.");
#endif
delete http;
// Did we get an error? If so, bail early
if (!mError.isNull())
{
QgsDebugMsg("QgsHttpTransaction::getSynchronously: Processing an error '" + mError + "'.");
return FALSE;
}
// Do one level of redirection
// TODO make this recursable
// TODO detect any redirection loops
if (!httpredirecturl.isEmpty())
{
QgsDebugMsg("QgsHttpTransaction::getSynchronously: Starting get of '" + httpredirecturl + "'.");
QgsHttpTransaction httprecurse(httpredirecturl, httphost, httpport);
// Do a passthrough for the status bar text
connect(
&httprecurse, SIGNAL(setStatus(QString)),
this, SIGNAL(setStatus(QString))
);
httprecurse.getSynchronously( respondedContent, (redirections + 1) );
return TRUE;
}
respondedContent = httpresponse;
return TRUE;
}
QString QgsHttpTransaction::responseContentType()
{
return httpresponsecontenttype;
}
void QgsHttpTransaction::dataStarted( int id )
{
QgsDebugMsg("QgsHttpTransaction::dataStarted with ID " + QString::number(id) + ".");
}
void QgsHttpTransaction::dataHeaderReceived( const QHttpResponseHeader& resp )
{
QgsDebugMsg("QgsHttpTransaction::dataHeaderReceived: statuscode " +
QString::number(resp.statusCode()) + ", reason '" + resp.reasonPhrase() + "', content type: '" +
resp.value("Content-Type") + "'.");
// We saw something come back, therefore restart the watchdog timer
mWatchdogTimer->start(NETWORK_TIMEOUT_MSEC);
if (resp.statusCode() == 302) // Redirect
{
// Grab the alternative URL
// (ref: "http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html")
httpredirecturl = resp.value("Location");
}
else if (resp.statusCode() == 200) // OK
{
// NOOP
}
else
{
mError = QString( tr("WMS Server responded unexpectedly with HTTP Status Code %1 (%2)") )
.arg( resp.statusCode() )
.arg( resp.reasonPhrase() );
}
httpresponsecontenttype = resp.value("Content-Type");
}
void QgsHttpTransaction::dataReceived( const QHttpResponseHeader& resp )
{
// TODO: Match 'resp' with 'http' if we move to multiple http connections
/* Comment this out for now - leave the coding of progressive rendering to another day.
char* temp;
if ( 0 < http->readBlock( temp, http->bytesAvailable() ) )
{
httpresponse.append(temp);
}
*/
// QgsDebugMsg("QgsHttpTransaction::dataReceived.");
// QgsDebugMsg("QgsHttpTransaction::dataReceived: received '" + data + "'.");
}
void QgsHttpTransaction::dataProgress( int done, int total )
{
// QgsDebugMsg("QgsHttpTransaction::dataProgress: got " + QString::number(done) + " of " + QString::number(total));
// We saw something come back, therefore restart the watchdog timer
mWatchdogTimer->start(NETWORK_TIMEOUT_MSEC);
QString status;
if (total)
{
status = QString( QObject::tr("Received %1 of %2 bytes") )
.arg( done )
.arg( total );
}
else
{
status = QString( QObject::tr("Received %1 bytes (total unknown)") )
.arg( done );
}
emit setStatus( status );
}
void QgsHttpTransaction::dataFinished( int id, bool error )
{
#ifdef QGISDEBUG
QgsDebugMsg("QgsHttpTransaction::dataFinished with ID " + QString::number(id) + ".");
// The signal that this slot is connected to, QHttp::requestFinished,
// appears to get called at the destruction of the QHttp if it is
// still working at the time of the destruction.
//
// This situation may occur when we've detected a timeout and
// we already set httpactive = FALSE.
//
// We have to detect this special case so that the last known error string is
// not overwritten (it should rightfully refer to the timeout event).
if (!httpactive)
{
QgsDebugMsg("QgsHttpTransaction::dataFinished - http activity loop already FALSE.");
return;
}
if (error)
{
QgsDebugMsg("QgsHttpTransaction::dataFinished - however there was an error.");
QgsDebugMsg("QgsHttpTransaction::dataFinished - " + http->errorString());
mError = QString( tr("HTTP response completed, however there was an error: %1") )
.arg( http->errorString() );
}
else
{
QgsDebugMsg("QgsHttpTransaction::dataFinished - no error.");
}
#endif
// Don't do this here as the request could have simply been
// to set the hostname - see transactionFinished() instead
// // TODO
// httpresponse = http->readAll();
//
// #ifdef QGISDEBUG
// std::cout << "QgsHttpTransaction::getSynchronously: Setting httpactive = FALSE" << std::endl;
// #endif
// httpactive = FALSE;
}
void QgsHttpTransaction::transactionFinished( bool error )
{
#ifdef QGISDEBUG
QgsDebugMsg("QgsHttpTransaction::transactionFinished.");
// // The signal that this slot is connected to, QHttp::requestFinished,
// // appears to get called at the destruction of the QHttp if it is
// // still working at the time of the destruction.
// //
// // This situation may occur when we've detected a timeout and
// // we already set httpactive = FALSE.
// //
// // We have to detect this special case so that the last known error string is
// // not overwritten (it should rightfully refer to the timeout event).
// if (!httpactive)
// {
// std::cout << "QgsHttpTransaction::dataFinished - http activity loop already FALSE." << std::endl;
// return;
// }
if (error)
{
QgsDebugMsg("QgsHttpTransaction::transactionFinished - however there was an error.");
QgsDebugMsg("QgsHttpTransaction::transactionFinished - " + http->errorString());
mError = QString( tr("HTTP transaction completed, however there was an error: %1") )
.arg( http->errorString() );
}
else
{
QgsDebugMsg("QgsHttpTransaction::transactionFinished - no error.");
}
#endif
// TODO
httpresponse = http->readAll();
QgsDebugMsg("QgsHttpTransaction::getSynchronously: Setting httpactive = FALSE");
httpactive = FALSE;
}
void QgsHttpTransaction::dataStateChanged( int state )
{
QgsDebugMsg("QgsHttpTransaction::dataStateChanged to " + QString::number(state) + ".");
// We saw something come back, therefore restart the watchdog timer
mWatchdogTimer->start(NETWORK_TIMEOUT_MSEC);
switch (state)
{
case QHttp::Unconnected:
QgsDebugMsg("There is no connection to the host.");
emit setStatus( QString(QObject::tr("Not connected") ) );
break;
case QHttp::HostLookup:
QgsDebugMsg("A host name lookup is in progress.");
emit setStatus( QString( QObject::tr("Looking up '%1'") )
.arg(httphost) );
break;
case QHttp::Connecting:
QgsDebugMsg("An attempt to connect to the host is in progress.");
emit setStatus( QString( QObject::tr("Connecting to '%1'") )
.arg(httphost) );
break;
case QHttp::Sending:
QgsDebugMsg("The client is sending its request to the server.");
emit setStatus( QString( QObject::tr("Sending request '%1'") )
.arg(httpurl) );
break;
case QHttp::Reading:
QgsDebugMsg("The client's request has been sent and the client is reading the server's response.");
emit setStatus( QString( QObject::tr("Receiving reply") ) );
break;
case QHttp::Connected:
QgsDebugMsg("The connection to the host is open, but the client is neither sending a request, nor waiting for a response.");
emit setStatus( QString( QObject::tr("Response is complete") ) );
break;
case QHttp::Closing:
QgsDebugMsg("The connection is closing down, but is not yet closed. (The state will be Unconnected when the connection is closed.)");
emit setStatus( QString( QObject::tr("Closing down connection") ) );
break;
}
}
void QgsHttpTransaction::networkTimedOut()
{
QgsDebugMsg("QgsHttpTransaction::networkTimedOut: entering.");
mError = QString(tr("Network timed out after %1 seconds of inactivity.\n"
"This may be a problem in your network connection or at the WMS server.","", NETWORK_TIMEOUT_MSEC/1000)
).arg(NETWORK_TIMEOUT_MSEC/1000);
QgsDebugMsg("QgsHttpTransaction::getSynchronously: Setting httpactive = FALSE");
httpactive = FALSE;
QgsDebugMsg("QgsHttpTransaction::networkTimedOut: exiting.");
}
QString QgsHttpTransaction::errorString()
{
return mError;
}
// ENDS