kicad/common/kicad_curl/kicad_curl.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2015 Mark Roszko <mark.roszko@gmail.com>
* Copyright (C) 2016 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
* Copyright (C) 2015-2020 KiCad Developers, see CHANGELOG.TXT for contributors.
*
* 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 3
* 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, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
// kicad_curl.h must be included before wx headers, to avoid
// conflicts for some defines, at least on Windows
#include <kicad_curl/kicad_curl.h>
#include <mutex>
#include <ki_exception.h> // THROW_IO_ERROR
// These are even more private than class members, and since there is only
// one instance of KICAD_CURL ever, these statics are hidden here to simplify the
// client (API) header file.
static volatile bool s_initialized;
static std::mutex s_lock; // for s_initialized
/// At process termination, using atexit() keeps the CURL stuff out of the
/// singletops and PGM_BASE.
static void at_terminate()
{
KICAD_CURL::Cleanup();
}
void KICAD_CURL::Init()
{
// We test s_initialized twice in an effort to avoid
// unnecessarily locking s_lock. This understands that the common case
// will not need to lock.
if( !s_initialized )
{
std::lock_guard<std::mutex> lock( s_lock );
if( !s_initialized )
{
if( curl_global_init( CURL_GLOBAL_ALL ) != CURLE_OK )
{
THROW_IO_ERROR( "curl_global_init() failed." );
}
s_initialized = true;
}
}
}
void KICAD_CURL::Cleanup()
{
/*
Calling lock_guard() from a static destructor will typically be bad, since the
s_lock may already have been statically destroyed itself leading to a boost
exception. (Remember C++ does not provide certain sequencing of static
destructor invocation.)
To prevent this we test s_initialized twice, which ensures that the lock_guard
is only instantiated on the first call, which should be from
PGM_BASE::destroy() which is first called earlier than static destruction.
Then when called again from the actual PGM_BASE::~PGM_BASE() function,
lock_guard will not be instantiated because s_initialized will be false.
*/
if( s_initialized )
{
std::lock_guard<std::mutex> lock( s_lock );
if( s_initialized )
{
curl_global_cleanup();
atexit( &at_terminate );
s_initialized = false;
}
}
}
std::string KICAD_CURL::GetSimpleVersion()
{
if( !s_initialized )
Init();
curl_version_info_data* info = curl_version_info( CURLVERSION_NOW );
std::string res;
if( info->version )
{
res += "libcurl version: " + std::string( info->version );
}
res += " (";
if( info->features & CURL_VERSION_SSL )
{
res += "with SSL - ";
res += std::string( info->ssl_version );
}
else
{
res += "without SSL";
}
res += ")";
return res;
}
std::string GetKicadCurlVersion()
{
return KICAD_CURL::GetVersion();
}
std::string GetCurlLibVersion()
{
return LIBCURL_VERSION;
}