/*
 * include/haproxy/peers-t.h
 * This file defines everything related to peers.
 *
 * Copyright 2010 EXCELIANCE, Emeric Brun <ebrun@exceliance.fr>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation, version 2.1
 * exclusively.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef _HAPROXY_PEERS_T_H
#define _HAPROXY_PEERS_T_H

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <import/eb32tree.h>

#include <haproxy/api-t.h>
#include <haproxy/dict-t.h>
#include <haproxy/thread-t.h>


struct shared_table {
	struct stktable *table;       /* stick table to sync */
	int local_id;
	int remote_id;
	int flags;
	uint64_t remote_data;
	unsigned int last_acked;
	unsigned int last_pushed;
	unsigned int last_get;
	unsigned int teaching_origin;
	unsigned int update;
	struct shared_table *next;    /* next shared table in list */
};

struct peer {
	int local;                    /* proxy state */
	__decl_thread(HA_SPINLOCK_T lock); /* lock used to handle this peer section */
	char *id;
	struct {
		const char *file;         /* file where the section appears */
		int line;                 /* line where the section appears */
	} conf;                       /* config information */
	time_t last_change;
	struct sockaddr_storage addr; /* peer address */
	struct protocol *proto;       /* peer address protocol */
	struct xprt_ops *xprt;        /* peer socket operations at transport layer */
	void *sock_init_arg;          /* socket operations's opaque init argument if needed */
	unsigned int flags;           /* peer session flags */
	unsigned int statuscode;      /* current/last session status code */
	unsigned int reconnect;       /* next connect timer */
	unsigned int heartbeat;       /* next heartbeat timer */
	unsigned int confirm;         /* confirm message counter */
	unsigned int last_hdshk;      /* Date of the last handshake. */
	uint32_t rx_hbt;              /* received heartbeats counter */
	uint32_t tx_hbt;              /* transmitted heartbeats counter */
	uint32_t no_hbt;              /* no received heartbeat counter */
	uint32_t new_conn;            /* new connection after reconnection timeout expiration counter */
	uint32_t proto_err;           /* protocol errors counter */
	uint32_t coll;                /* connection collisions counter */
	struct appctx *appctx;        /* the appctx running it */
	struct shared_table *remote_table;
	struct shared_table *last_local_table;
	struct shared_table *tables;
	struct server *srv;
	struct dcache *dcache;        /* dictionary cache */
	struct peer *next;            /* next peer in the list */
};


struct peers {
	char *id;                       /* peer section name */
	struct task *sync_task;         /* main sync task */
	struct sig_handler *sighandler; /* signal handler */
	struct peer *remote;            /* remote peers list */
	struct peer *local;             /* local peer list */
	struct proxy *peers_fe;         /* peer frontend */
	struct {
		const char *file;           /* file where the section appears */
		int line;                   /* line where the section appears */
	} conf;                         /* config information */
	time_t last_change;
	struct peers *next;             /* next peer section */
	unsigned int flags;             /* current peers section resync state */
	unsigned int resync_timeout;    /* resync timeout timer */
	int count;                      /* total of peers */
	int disabled;                   /* peers proxy disabled if >0 */
};

/* LRU cache for dictionaies */
struct dcache_tx {
	/* The last recently used key */
	unsigned int lru_key;
	/* An array of entries to store pointers to dictionary entries. */
	struct ebpt_node *entries;
	/* The previous lookup result. */
	struct ebpt_node *prev_lookup;
	/* ebtree to store the previous entries. */
	struct eb_root cached_entries;
};

struct dcache_rx {
	unsigned int id;
	struct dict_entry *de;
};

struct dcache_tx_entry {
	unsigned int id;
	struct ebpt_node entry;
};

/* stick-table data type cache */
struct dcache {
	/* Cache used upon transmission */
	struct dcache_tx *tx;
	/* Cache used upon receipt */
	struct dcache_rx *rx;
	/* Maximum number of entries in this cache */
	size_t max_entries;
};

#endif /* _HAPROXY_PEERS_T_H */