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openvpn3/openvpn/asio/asiowork.hpp
James Yonan 691a641a43 Added i/o abstraction layer.
Created a lightweight abstraction layer so that another i/o
reactor can be dropped in place of asio.

The basic approach is to rename all references to asio::xxx
types to openvpn_io::xxx and then make openvpn_io a
preprocessor variable that points to the top-level namespace
of the i/o reactor implementation.

All of the source files that currently include <asio.hpp> now
include <openvpn/io/io.hpp> instead:

This gives us a lightweight abstraction layer that allows us
to define openvpn_io to be something other than asio.

Other changes:

* Inclusion of asio by scripts/build is now optional, and is
  enabled by passing ASIO=1 or ASIO_DIR=<dir>.

* Refactored openvpn/common/socktypes.hpp to no longer
  require asio.

* Refactored openvpn/log/logthread.hpp to no longer require
  asio.

* Added openvpn::get_hostname() method as alternative to
  calling asio directly.

* openvpn/openssl/util/init.hpp will now #error
  if USE_ASIO is undefined.

Signed-off-by: James Yonan <james@openvpn.net>
2017-03-30 15:48:14 -06:00

45 lines
1.4 KiB
C++

// 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) 2012-2017 OpenVPN Technologies, Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License Version 3
// as published by the Free Software Foundation.
//
// 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 in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
// A null Asio unit of work, that prevents the Asio event loop from
// exiting.
#ifndef OPENVPN_ASIO_ASIOWORK_H
#define OPENVPN_ASIO_ASIOWORK_H
#include <openvpn/io/io.hpp>
namespace openvpn {
class AsioWork
{
public:
AsioWork(openvpn_io::io_context& io_context)
: work(openvpn_io::make_work_guard(io_context))
{
}
private:
openvpn_io::executor_work_guard<openvpn_io::io_context::executor_type> work;
};
}
#endif