ClientInternal.hxx

/*
 * Copyright (C) 2003-2013 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_CLIENT_INTERNAL_HXX
#define MPD_CLIENT_INTERNAL_HXX

#include "Client.hxx"
#include "ClientMessage.hxx"
#include "CommandListBuilder.hxx"
#include "command.h"

#include <set>
#include <string>
#include <list>

#include <glib.h>

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "client"

enum {
	CLIENT_MAX_SUBSCRIPTIONS = 16,
	CLIENT_MAX_MESSAGES = 64,
};

struct deferred_buffer {
	size_t size;
	char data[sizeof(long)];
};

class Client {
public:
	struct player_control *player_control;

	GIOChannel *channel;
	guint source_id;

	/** the buffer for reading lines from the #channel */
	struct fifo_buffer *input;

	unsigned permission;

	/** the uid of the client process, or -1 if unknown */
	int uid;

	/**
	 * How long since the last activity from this client?
	 */
	GTimer *last_activity;

	CommandListBuilder cmd_list;

	GQueue *deferred_send;	/* for output if client is slow */
	size_t deferred_bytes;	/* mem deferred_send consumes */
	unsigned int num;	/* client number */

	char send_buf[16384];
	size_t send_buf_used;	/* bytes used this instance */

	/** is this client waiting for an "idle" response? */
	bool idle_waiting;

	/** idle flags pending on this client, to be sent as soon as
	    the client enters "idle" */
	unsigned idle_flags;

	/** idle flags that the client wants to receive */
	unsigned idle_subscriptions;

	/**
	 * A list of channel names this client is subscribed to.
	 */
	std::set<std::string> subscriptions;

	/**
	 * The number of subscriptions in #subscriptions.  Used to
	 * limit the number of subscriptions.
	 */
	unsigned num_subscriptions;

	/**
	 * A list of messages this client has received.
	 */
	std::list<ClientMessage> messages;

	Client(struct player_control *player_control,
	       int fd, int uid, int num);
	~Client();

	gcc_pure
	bool IsSubscribed(const char *channel_name) const {
		return subscriptions.find(channel_name) != subscriptions.end();
	}
};

extern unsigned int client_max_connections;
extern int client_timeout;
extern size_t client_max_command_list_size;
extern size_t client_max_output_buffer_size;

bool
client_list_is_empty(void);

bool
client_list_is_full(void);

Client *
client_list_get_first(void);

void
client_list_add(Client *client);

void
client_list_foreach(GFunc func, gpointer user_data);

void
client_list_remove(Client *client);

void
client_close(Client *client);

void
client_set_expired(Client *client);

/**
 * Schedule an "expired" check for all clients: permanently delete
 * clients which have been set "expired" with client_set_expired().
 */
void
client_schedule_expire(void);

/**
 * Removes a scheduled "expired" check.
 */
void
client_deinit_expire(void);

enum command_return
client_read(Client *client);

enum command_return
client_process_line(Client *client, char *line);

void
client_write_deferred(Client *client);

void
client_write_output(Client *client);

gboolean
client_in_event(GIOChannel *source, GIOCondition condition,
		gpointer data);

#endif