MultiMC5/logic/launch/LoggedProcess.cpp

#include "LoggedProcess.h"
#include "MessageLevel.h"
#include <QDebug>

LoggedProcess::LoggedProcess(QObject *parent) : QProcess(parent)
{
	// QProcess has a strange interface... let's map a lot of those into a few.
	connect(this, &QProcess::readyReadStandardOutput, this, &LoggedProcess::on_stdOut);
	connect(this, &QProcess::readyReadStandardError, this, &LoggedProcess::on_stdErr);
	connect(this, SIGNAL(finished(int,QProcess::ExitStatus)), SLOT(on_exit(int,QProcess::ExitStatus)));
	connect(this, SIGNAL(error(QProcess::ProcessError)), this, SLOT(on_error(QProcess::ProcessError)));
	connect(this, &QProcess::stateChanged, this, &LoggedProcess::on_stateChange);
}

QStringList reprocess(const QByteArray & data, QString & leftover)
{
	QString str = leftover + QString::fromLocal8Bit(data);

	str.remove('\r');
	QStringList lines = str.split("\n");
	leftover = lines.takeLast();
	return lines;
}

void LoggedProcess::on_stdErr()
{
	auto lines = reprocess(readAllStandardError(), m_err_leftover);
	emit log(lines, MessageLevel::StdErr);
}

void LoggedProcess::on_stdOut()
{
	auto lines = reprocess(readAllStandardOutput(), m_out_leftover);
	emit log(lines, MessageLevel::StdOut);
}

void LoggedProcess::on_exit(int exit_code, QProcess::ExitStatus status)
{
	// save the exit code
	m_exit_code = exit_code;

	// Flush console window
	if (!m_err_leftover.isEmpty())
	{
		emit log({m_err_leftover}, MessageLevel::StdErr);
		m_err_leftover.clear();
	}
	if (!m_out_leftover.isEmpty())
	{
		emit log({m_err_leftover}, MessageLevel::StdOut);
		m_out_leftover.clear();
	}

	// based on state, send signals
	if (!m_is_aborting)
	{
		if (status == QProcess::NormalExit)
		{
			//: Message displayed on instance exit
			emit log({tr("Process exited with code %1.").arg(exit_code)}, MessageLevel::MultiMC);
			changeState(LoggedProcess::Finished);
		}
		else
		{
			//: Message displayed on instance crashed
			if(exit_code == -1)
				emit log({tr("Process crashed.")}, MessageLevel::MultiMC);
			else
				emit log({tr("Process crashed with exitcode %1.").arg(exit_code)}, MessageLevel::MultiMC);
			changeState(LoggedProcess::Crashed);
		}
	}
	else
	{
		//: Message displayed after the instance exits due to kill request
		emit log({tr("Process was killed by user.")}, MessageLevel::Error);
		changeState(LoggedProcess::Aborted);
	}
}

void LoggedProcess::on_error(QProcess::ProcessError error)
{
	switch(error)
	{
		case QProcess::FailedToStart:
		{
			emit log({tr("The process failed to start.")}, MessageLevel::Fatal);
			changeState(LoggedProcess::FailedToStart);
			break;
		}
		// we'll just ignore those... never needed them
		case QProcess::Crashed:
		case QProcess::ReadError:
		case QProcess::Timedout:
		case QProcess::UnknownError:
		case QProcess::WriteError:
			break;
	}
}

void LoggedProcess::kill()
{
	m_is_aborting = true;
	QProcess::kill();
}

int LoggedProcess::exitCode() const
{
	return m_exit_code;
}

void LoggedProcess::changeState(LoggedProcess::State state)
{
	if(state == m_state)
		return;
	m_state = state;
	emit stateChanged(m_state);
}

LoggedProcess::State LoggedProcess::state() const
{
	return m_state;
}

void LoggedProcess::on_stateChange(QProcess::ProcessState state)
{
	switch(state)
	{
		case QProcess::NotRunning:
			break; // let's not - there are too many that handle this already.
		case QProcess::Starting:
		{
			if(m_state != LoggedProcess::NotRunning)
			{
				qWarning() << "Wrong state change for process from state" << m_state << "to" << (int) LoggedProcess::Starting;
			}
			changeState(LoggedProcess::Starting);
			return;
		}
		case QProcess::Running:
		{
			if(m_state != LoggedProcess::Starting)
			{
				qWarning() << "Wrong state change for process from state" << m_state << "to" << (int) LoggedProcess::Running;
			}
			changeState(LoggedProcess::Running);
			return;
		}
	}
}