HttpdClient.hxx

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/*
 * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * 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 MPD_OUTPUT_HTTPD_CLIENT_HXX
#define MPD_OUTPUT_HTTPD_CLIENT_HXX

#include "event/BufferedSocket.hxx"
#include "Compiler.h"

#include <boost/intrusive/link_mode.hpp>
#include <boost/intrusive/list_hook.hpp>

#include <queue>
#include <list>

#include <stddef.h>

class HttpdOutput;
class Page;

class HttpdClient final
        : BufferedSocket,
          public boost::intrusive::list_base_hook<boost::intrusive::link_mode<boost::intrusive::normal_link>> {
        HttpdOutput &httpd;

        enum {
                REQUEST,

                HEADERS,

                RESPONSE,
        } state;

        std::queue<Page *, std::list<Page *>> pages;

        size_t queue_size;

        Page *current_page;

        size_t current_position;

        bool head_method;

        /* ICY */

        bool metadata_supported;

        bool metadata_requested;

        bool metadata_sent;

        unsigned metaint;

        Page *metadata;

        /*
         * The amount of bytes which were already sent from the metadata.
         */
        size_t metadata_current_position;

        unsigned metadata_fill;

public:
        HttpdClient(HttpdOutput &httpd, int _fd, EventLoop &_loop,
                    bool _metadata_supported);

        ~HttpdClient();

        void Close();

        void LockClose();

        void CancelQueue();

        bool HandleLine(const char *line);

        void BeginResponse();

        bool SendResponse();

        gcc_pure
        ssize_t GetBytesTillMetaData() const noexcept;

        ssize_t TryWritePage(const Page &page, size_t position);
        ssize_t TryWritePageN(const Page &page, size_t position, ssize_t n);

        bool TryWrite();

        void PushPage(Page *page);

        void PushMetaData(Page *page);

private:
        void ClearQueue();

protected:
        virtual bool OnSocketReady(unsigned flags) override;
        virtual InputResult OnSocketInput(void *data, size_t length) override;
        void OnSocketError(std::exception_ptr ep) override;
        virtual void OnSocketClosed() override;
};

#endif