TransientDirectory.cpp

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/*
        This file is part of cpp-ethereum.

        cpp-ethereum 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 3 of the License, or
        (at your option) any later version.

        cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <thread>
#include <boost/filesystem.hpp>
#include "Exceptions.h"
#include "TransientDirectory.h"
#include "CommonIO.h"
#include "Log.h"
using namespace std;
using namespace dev;
namespace fs = boost::filesystem;

TransientDirectory::TransientDirectory():
        TransientDirectory((boost::filesystem::temp_directory_path() / "eth_transient" / toString(FixedHash<4>::random())).string())
{}

TransientDirectory::TransientDirectory(std::string const& _path):
        m_path(_path)
{
        // we never ever want to delete a directory (including all its contents) that we did not create ourselves.
        if (boost::filesystem::exists(m_path))
                BOOST_THROW_EXCEPTION(FileError());

        if (!fs::create_directories(m_path))
                BOOST_THROW_EXCEPTION(FileError());
        DEV_IGNORE_EXCEPTIONS(fs::permissions(m_path, fs::owner_all));
}

TransientDirectory::~TransientDirectory()
{
        boost::system::error_code ec;           
        fs::remove_all(m_path, ec);
        if (!ec)
                return;

        // In some cases, antivirus runnig on Windows will scan all the newly created directories.
        // As a consequence, directory is locked and can not be deleted immediately.
        // Retry after 10 milliseconds usually is successful.
        // This will help our tests run smoothly in such environment.
        this_thread::sleep_for(chrono::milliseconds(10));

        ec.clear();
        fs::remove_all(m_path, ec);
        if (!ec)
        {
                cwarn << "Failed to delete directory '" << m_path << "': " << ec.message();
        }
}