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server.h
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150 lines (129 loc) · 4.75 KB
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/*******************************************************************************
* CLI - A simple command line interface.
* Copyright (C) 2016 Daniele Pallastrelli
*
* Boost Software License - Version 1.0 - August 17th, 2003
*
* Permission is hereby granted, free of charge, to any person or organization
* obtaining a copy of the software and accompanying documentation covered by
* this license (the "Software") to use, reproduce, display, distribute,
* execute, and transmit the Software, and to prepare derivative works of the
* Software, and to permit third-parties to whom the Software is furnished to
* do so, all subject to the following:
*
* The copyright notices in the Software and this entire statement, including
* the above license grant, this restriction and the following disclaimer,
* must be included in all copies of the Software, in whole or in part, and
* all derivative works of the Software, unless such copies or derivative
* works are solely in the form of machine-executable object code generated by
* a source language processor.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
******************************************************************************/
#ifndef SERVER_H_
#define SERVER_H_
#include <memory>
#include <boost/asio.hpp>
#include <queue>
namespace cli
{
class Session : public std::enable_shared_from_this<Session>, public std::streambuf
{
public:
virtual ~Session() = default;
virtual void Start()
{
OnConnect();
Read();
}
protected:
Session( boost::asio::ip::tcp::socket socket ) : socket( std::move( socket ) ), outStream( this ) {}
virtual void Disconnect()
{
socket.shutdown( boost::asio::ip::tcp::socket::shutdown_both );
socket.close();
}
virtual void Read()
{
auto self( shared_from_this() );
socket.async_read_some( boost::asio::buffer( data, max_length ),
[ this, self ]( boost::system::error_code ec, std::size_t length )
{
if ( !socket.is_open() || ( ec == boost::asio::error::eof ) || ( ec == boost::asio::error::connection_reset ) )
OnDisconnect();
else if ( ec )
OnError();
else
{
OnDataReceived( std::string( data, length ));
Read();
}
});
}
virtual void Send(const std::string& msg)
{
boost::system::error_code ec;
boost::asio::write(socket, boost::asio::buffer(msg), ec);
if ((ec == boost::asio::error::eof) || (ec == boost::asio::error::connection_reset))
OnDisconnect();
else if (ec)
OnError();
}
virtual std::ostream& OutStream() { return outStream; }
virtual void OnConnect() = 0;
virtual void OnDisconnect() = 0;
virtual void OnError() = 0;
virtual void OnDataReceived( const std::string& data ) = 0;
virtual std::string Encode(const std::string& data) const { return data; }
private:
// std::streambuf
std::streamsize xsputn( const char* s, std::streamsize n ) override
{
Send(Encode(std::string(s, s+n)));
return n;
}
int overflow( int c ) override
{
Send(Encode(std::string(1, static_cast< char >(c))));
return c;
}
boost::asio::ip::tcp::socket socket;
enum { max_length = 1024 };
char data[ max_length ];
std::ostream outStream;
};
class Server
{
public:
// disable value semantics
Server( const Server& ) = delete;
Server& operator = ( const Server& ) = delete;
Server( boost::asio::io_context& ios, short port ) :
acceptor( ios, boost::asio::ip::tcp::endpoint( boost::asio::ip::tcp::v4(), port ) ),
socket( ios )
{
Accept();
}
virtual ~Server() = default;
// returns shared_ptr instead of unique_ptr because Session needs to use enable_shared_from_this
virtual std::shared_ptr< Session > CreateSession( boost::asio::ip::tcp::socket socket ) = 0;
private:
void Accept()
{
acceptor.async_accept( socket, [this](boost::system::error_code ec)
{
if ( !ec ) CreateSession( std::move( socket ) ) -> Start();
Accept();
});
}
boost::asio::ip::tcp::acceptor acceptor;
boost::asio::ip::tcp::socket socket;
};
} // namespace cli
#endif