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();
    }
}