Reporter.cpp

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/*
 * Hydrogen
 * Copyright(c) 2008-2024 The hydrogen development team [hydrogen-devel@lists.sourceforge.net]
 *
 * http://www.hydrogen-music.org
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY, without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see https://www.gnu.org/licenses
 *
 */
#include <iostream>
#include <signal.h>
#include "core/Hydrogen.h"
#include "core/Helpers/Filesystem.h"
#include "core/Logger.h"
#include "Reporter.h"
 
 
QString Reporter::m_sPrefix = "Fatal error in: ";
 
std::set<QProcess *> Reporter::m_children;
 
using namespace H2Core;
 
void Reporter::addLine( QString s )
{
        // Keep only a few lines of the output
        while ( m_lines.size() > 128 ) {
                // Record context
                if ( m_lines[0].startsWith( m_sPrefix )) {
                        m_sContext = m_lines[0];
                        Logger::setCrashContext( &m_sContext );
                }
                m_lines.pop_front();
        }
        if ( m_lines.size() == 0 ) {
                m_lines.push_back( QString( "" ) );
        }
        
        QStringList parts = s.split( "\n" );
        QString sLastLine = m_lines.back();
        m_lines.pop_back();
        // Append the first part to the last line
        sLastLine += parts.takeFirst();
        m_lines.push_back( sLastLine );
        for ( auto &s : parts ) {
                m_lines.push_back( s );
        }
}
 
Reporter::Reporter( QProcess *pChild )
{
        assert( pChild != nullptr );
        this->m_pChild = pChild;
        m_children.insert( pChild );
 
        connect( pChild, &QProcess::readyReadStandardOutput,
                         this, &Reporter::on_readyReadStandardOutput );
        connect( pChild, &QProcess::readyReadStandardError,
                         this, &Reporter::on_readyReadStandardError );
        connect( pChild, static_cast<void(QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished),
                         this, &Reporter::on_finished );
}
 
Reporter::~Reporter()
{
        m_children.erase( this->m_pChild );
}
 
void Reporter::waitForFinished()
{
        assert( m_pChild );
        while ( m_pChild->state() != QProcess::NotRunning ) {
                m_pChild->waitForFinished();
        }
}
 
 
void Reporter::report( void )
{
        std::cerr.flush();
        std::cout.flush();
        QString *pContext = Logger::getCrashContext();
        if ( pContext != nullptr ) {
                std::cerr << m_sPrefix.toStdString() << pContext->toStdString()
                                  << std::endl;
                std::cerr.flush();
        }
}
 
 
void Reporter::on_readyReadStandardError( void )
{
        std::string s = m_pChild->readAllStandardError().toStdString();
        std::cerr << s.c_str();
        addLine( s.c_str() );
}
 
void Reporter::on_readyReadStandardOutput( void )
{
        std::string s = m_pChild->readAllStandardOutput().toStdString();
        std::cout << s.c_str();
        addLine( s.c_str() );
}
 
void Reporter::on_openLog( void )
{
        qDebug() << "Open log...";
        QDesktopServices::openUrl( QUrl::fromLocalFile( H2Core::Filesystem::log_file_path() ) );
}
 
void Reporter::on_finished( int exitCode, QProcess::ExitStatus exitStatus )
{
        on_readyReadStandardError();
        on_readyReadStandardOutput();
 
        if ( m_pChild->exitStatus() != QProcess::NormalExit ) {
 
                char *argv[] = { (char *)"-" };
                int argc = 1;
                QApplication app ( argc, argv );
                app.setApplicationName( "Hydrogen" );
 
                QString sDetails;
                for ( QString &s : m_lines ) {
                        // Filter out escape sequences
                        s.remove( "\e[0m" );
                        s.remove( "\e[31m" );
                        s.remove( "\e[32m" );
                        s.remove( "\e[35m" );
                        s.remove( "\e[35;1m" );
                        s.remove( "\e[36m" );
                        sDetails += s + "\n";
                        if ( s.startsWith( m_sPrefix ) ) {
                                m_sContext = s;
                        }
                }
 
                QMessageBox msgBox;
                msgBox.setText( tr( "Hydrogen exited abnormally" ) );
 
                QString sInformative;
                if ( !m_sContext.isNull() ) {
                        sInformative = m_sContext + "\n\n";
                }
                sInformative += tr( "You can check the Hydrogen issue tracker on Github to see if this issue "
                                                        "is already known about. "
                                                        "If not, you can report it there to help the development team get you back on track "
                                                        "and improve Hydrogen for the future." ) + "\n";
                msgBox.setInformativeText( sInformative );
 
                msgBox.setStandardButtons( QMessageBox::Ok );
                msgBox.setDefaultButton( QMessageBox::Discard );
                msgBox.setWindowTitle( "Hydrogen" );
                msgBox.setIcon( QMessageBox::Critical );
 
                msgBox.setDetailedText( sDetails );
 
                QPushButton *pLogButton = msgBox.addButton( tr( "Open log file..." ),
                                                                                                        QMessageBox::ActionRole );
 
                QPushButton *pIssuesButton = msgBox.addButton( tr( "Github Issue tracker..." ),
                                                                                                           QMessageBox::ActionRole );
 
                do {
                        msgBox.exec();
                        QAbstractButton *pPushed = msgBox.clickedButton();
                        
                        if ( pLogButton == pPushed ) {
                                QDesktopServices::openUrl( QUrl::fromLocalFile( H2Core::Filesystem::log_file_path() ) );
 
                        } else if ( pPushed == pIssuesButton ) {
                                QDesktopServices::openUrl( QUrl( "https://github.com/hydrogen-music/hydrogen/issues") );
 
                        } else {
                                break;
                        }
                } while ( true );
 
        }
}
 
void Reporter::handleSignal( int nSignal )
{
        // First disable signal handler to allow normal termination
        signal( nSignal, SIG_DFL );
 
        for ( QProcess *pChild : m_children ) {
#ifndef WIN32
                kill( pChild->processId(), nSignal );
#else
                // On Windows, we can't use kill() to pass along the signal we received, so just use
                // QProcess::terminate()
                pChild->terminate();
#endif
        }
 
        raise( nSignal );
}
 
static void handleSignal( int nSignal ) {
        Reporter::handleSignal( nSignal );
}
 
void Reporter::spawn(int argc, char *argv[])
{
        QStringList arguments;
        for ( int i = 1; i < argc; i++ ) {
                if ( argv[i] == QString("--child") ) {
                        return;
                }
                arguments << QString( argv[i] );
        }
 
        QProcess subProcess;
        arguments << "--child";
        subProcess.start(argv[0], arguments);
 
        // Signal handler
        for ( int nSignal : { SIGINT, SIGTERM
#ifndef WIN32
                                                 , SIGHUP
#endif
                } ) {
                signal( nSignal, ::handleSignal );
        }
 
        Reporter reporter( &subProcess );
        reporter.waitForFinished();
        exit( subProcess.exitCode() );
}