mcp_http_server.h

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/*
 * Copyright (C) 2026 Frank Povazanj <frank.povazanj@gmail.com>
 *
 * 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 2 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef _ardour_surface_mcp_http_server_h_
#define _ardour_surface_mcp_http_server_h_
 
#include <atomic>
#include <stdint.h>
#include <string>
#include <thread>
#include <unordered_map>
 
#include <libwebsockets.h>
 
namespace PBD
{
class EventLoop;
}
 
namespace ARDOUR
{
class Session;
}
 
namespace ArdourSurface
{
 
class MCPHttpServer
{
public:
        MCPHttpServer (ARDOUR::Session&, uint16_t port, int debug_level, PBD::EventLoop* event_loop);
        ~MCPHttpServer ();
 
        int  start ();
        int  stop ();
        void set_debug_level (int);
        int  debug_level () const;
 
private:
        struct ClientContext {
                bool        mcp_post;
                bool        have_response;
                std::string request_body;
                std::string response_body;
        };
 
        typedef std::unordered_map<struct lws*, ClientContext> ClientMap;
 
        ARDOUR::Session&                 _session;
        uint16_t                         _port;
        std::atomic<int>                 _debug_level;
        PBD::EventLoop*                  _event_loop;
        struct lws_context*              _context;
        struct lws_protocols             _protocols[2];
        struct lws_context_creation_info _info;
        ClientMap                        _clients;
        std::thread                      _service_thread;
        bool                             _running;
 
        void run ();
 
        ClientContext& client (struct lws*);
        void           erase_client (struct lws*);
 
        int callback (struct lws*, enum lws_callback_reasons, void*, void*, size_t);
        int handle_http (struct lws*, ClientContext&);
        int handle_http_body (struct lws*, ClientContext&, void*, size_t);
        int handle_http_body_completion (struct lws*, ClientContext&);
        int handle_http_writeable (struct lws*, ClientContext&);
 
        int send_json_headers (struct lws*);
        int send_http_status (struct lws*, unsigned int);
        int write_json_response (struct lws*, ClientContext&);
 
        std::string dispatch_jsonrpc (const std::string&) const;
 
        static int lws_callback (struct lws*, enum lws_callback_reasons, void*, void*, size_t);
};
 
} // namespace ArdourSurface
 
#endif // _ardour_surface_mcp_http_server_h_