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/*
* Copyright (C) 2003-2015 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/list.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>> {
/**
* The httpd output object this client is connected to.
*/
HttpdOutput &httpd;
/**
* The current state of the client.
*/
enum {
/** reading the request line */
REQUEST,
/** reading the request headers */
HEADERS,
/** sending the HTTP response */
RESPONSE,
} state;
/**
* A queue of #Page objects to be sent to the client.
*/
std::queue<Page *, std::list<Page *>> pages;
/**
* The sum of all page sizes in #pages.
*/
size_t queue_size;
/**
* The #page which is currently being sent to the client.
*/
Page *current_page;
/**
* The amount of bytes which were already sent from
* #current_page.
*/
size_t current_position;
/**
* Is this a HEAD request?
*/
bool head_method;
/**
* If DLNA streaming was an option.
*/
bool dlna_streaming_requested;
/* ICY */
/**
* Do we support sending Icy-Metadata to the client? This is
* disabled if the httpd audio output uses encoder tags.
*/
bool metadata_supported;
/**
* If we should sent icy metadata.
*/
bool metadata_requested;
/**
* If the current metadata was already sent to the client.
*/
bool metadata_sent;
/**
* The amount of streaming data between each metadata block
*/
unsigned metaint;
/**
* The metadata as #Page which is currently being sent to the client.
*/
Page *metadata;
/*
* The amount of bytes which were already sent from the metadata.
*/
size_t metadata_current_position;
/**
* The amount of streaming data sent to the client
* since the last icy information was sent.
*/
unsigned metadata_fill;
public:
/**
* @param httpd the HTTP output device
* @param _fd the socket file descriptor
*/
HttpdClient(HttpdOutput &httpd, int _fd, EventLoop &_loop,
bool _metadata_supported);
/**
* Note: this does not remove the client from the
* #HttpdOutput object.
*/
~HttpdClient();
/**
* Frees the client and removes it from the server's client list.
*/
void Close();
void LockClose();
/**
* Clears the page queue.
*/
void CancelQueue();
/**
* Handle a line of the HTTP request.
*/
bool HandleLine(const char *line);
/**
* Switch the client to the "RESPONSE" state.
*/
void BeginResponse();
/**
* Sends the status line and response headers to the client.
*/
bool SendResponse();
gcc_pure
ssize_t GetBytesTillMetaData() const;
ssize_t TryWritePage(const Page &page, size_t position);
ssize_t TryWritePageN(const Page &page, size_t position, ssize_t n);
bool TryWrite();
/**
* Appends a page to the client's queue.
*/
void PushPage(Page *page);
/**
* Sends the passed metadata.
*/
void PushMetaData(Page *page);
private:
void ClearQueue();
protected:
virtual bool OnSocketReady(unsigned flags) override;
virtual InputResult OnSocketInput(void *data, size_t length) override;
virtual void OnSocketError(Error &&error) override;
virtual void OnSocketClosed() override;
};
#endif
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