/*
 * Copyright (c) 2001-2003, Raphael Manfredi
 *
 *----------------------------------------------------------------------
 * This file is part of gtk-gnutella.
 *
 *  gtk-gnutella 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.
 *
 *  gtk-gnutella 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 gtk-gnutella; if not, write to the Free Software
 *  Foundation, Inc.:
 *      51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *----------------------------------------------------------------------
 */

#ifndef _core_routing_h_
#define _core_routing_h_

#include "common.h"

#include "gnutella.h"

struct guid;

/**
 * Route destination types.
 */

typedef enum {
	ROUTE_NONE = 0,			/**< No route, message stops here */
	ROUTE_LEAVES,			/**< Route to leaves only */
	ROUTE_ONE,				/**< Route to single node */
	ROUTE_ALL_BUT_ONE,		/**< Route to all nodes but one */
	ROUTE_MULTI				/**< Route to list of nodes */
} route_type_t;

/**
 * Routing destination, as determined by route_message().
 */

struct route_dest {
	route_type_t type;
	union {
		struct gnutella_node *u_node;
		struct pslist *u_nodes;	/**< For ROUTE_MULTI */
	} ur;
	unsigned duplicate:1;	/**< Set if message was a duplicate */
};

/**
 * Starving GUID callback.
 */
typedef void (*route_starving_cb_t)(const struct guid *);

/*
 * Global Functions
 */

void gnet_reset_guid(void);

void routing_init(void);
void routing_close(void);
void routing_clear_all(void);
void message_set_muid(gnutella_header_t *header, uint8 function);
bool route_message(struct gnutella_node **, struct route_dest *);
void routing_node_remove(void *node);
void message_add(const struct guid *muid, uint8, struct gnutella_node *);
void message_forget(const struct guid *muid, uint8, struct gnutella_node *);
struct pslist *route_towards_guid(const struct guid *guid);
bool route_exists_for_reply(const struct guid *muid, uint8 function);
bool route_guid_pushable(const struct guid *guid);
void route_udp_mark_deflatable(const struct gnutella_node *n);
void route_udp_mark_semi_reliable(const struct gnutella_node *n);

bool route_proxy_add(const struct guid *guid, struct gnutella_node *n);
void route_proxy_remove(const struct guid *guid);
struct gnutella_node *route_proxy_find(const struct guid *guid);

void route_starving_add(const struct guid *guid, route_starving_cb_t cb);
void route_starving_remove(const struct guid *guid);

#endif /* _core_routing_h_ */

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