logthread_class.hpp

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//    OpenVPN -- An application to securely tunnel IP networks
//               over a single port, with support for SSL/TLS-based
//               session authentication and key exchange,
//               packet encryption, packet authentication, and
//               packet compression.
//
//    Copyright (C) 2012- OpenVPN Inc.
//
//    SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
 
#pragma once
 
// Define this parameter before including this header:
// OPENVPN_LOG_CLASS -- client class that exposes a log() method
#ifndef OPENVPN_LOG_CLASS
#error OPENVPN_LOG_CLASS must be defined
#endif
 
namespace openvpn::Log {
 
#ifdef OPENVPN_LOG_GLOBAL
// OPENVPN_LOG uses global object pointer
inline OPENVPN_LOG_CLASS *global_log = nullptr; // GLOBAL
#else
// OPENVPN_LOG uses thread-local object pointer
inline thread_local OPENVPN_LOG_CLASS *global_log = nullptr; // GLOBAL
#endif
 
struct Context
{
    class Wrapper
    {
#ifndef OPENVPN_LOG_GLOBAL
      public:
        Wrapper()
            : log(obj())
        {
        }
 
      private:
        friend struct Context;
        OPENVPN_LOG_CLASS *log;
#endif
    };
 
    Context(const Wrapper &wrap)
    {
#ifndef OPENVPN_LOG_GLOBAL
        global_log = wrap.log;
#endif
    }
 
    Context(OPENVPN_LOG_CLASS *cli)
    {
        global_log = cli;
    }
 
    ~Context()
    {
        global_log = nullptr;
    }
 
    static bool defined()
    {
        return global_log != nullptr;
    }
 
    static OPENVPN_LOG_CLASS *obj()
    {
        return global_log;
    }
};
} // namespace openvpn::Log