io_override.h

// Copyright 2025 The Aerospace Corporation.
// This file is a part of SatCat5, licensed under CERN-OHL-W v2 or later.
// Remote-control override of an I/O device.
 
#pragma once
 
#include <satcat5/io_readable.h>
#include <satcat5/io_writeable.h>
#include <satcat5/polling.h>
 
namespace satcat5 {
    namespace io {
        class Override final
            : public satcat5::io::ReadableRedirect
            , public satcat5::io::WriteableRedirect
            , protected satcat5::io::EventListener
            , protected satcat5::poll::Timer
        {
        public:
            Override(
                satcat5::io::Writeable* dst,
                satcat5::io::Readable* src,
                satcat5::io::CopyMode mode = CopyMode::PACKET);
            ~Override() SATCAT5_OPTIONAL_DTOR;
 
            void set_callback(satcat5::io::EventListener* callback) override
                { satcat5::io::Readable::set_callback(callback); }
 
            inline bool is_remote() const
                { return m_remote; }
 
            void set_override(bool remote);
 
            void set_remote(satcat5::io::Writeable* tx, satcat5::io::Readable* rx);
 
            void set_timeout(unsigned msec);
 
        protected:
            // Event handlers.
            void data_rcvd(satcat5::io::Readable* src) override;
            void data_unlink(satcat5::io::Readable* src) override;
            void timer_event() override;
            void watchdog_reset();
 
            // Internal state
            satcat5::io::Readable  *m_dev_rd, *m_ovr_rd;
            satcat5::io::Writeable *m_dev_wr, *m_ovr_wr;
            const satcat5::io::CopyMode m_mode;
            bool m_remote;
            unsigned m_timeout;
        };
    }
}