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8d78fa7def
Make usage of the APIs implemented for dictionaries (dict.c) and their LRU caches (struct dcache) so that to send/receive server names used for the server by name stickiness. These names are sent over the network as follows: - in every case we send the encode length of the data (STD_T_DICT), then - if the server names is not present in the cache used upon transmission (struct dcache_tx) we cache it and we the ID of this TX cache entry followed the encode length of the server name, and finally the sever name itseft (non NULL terminated string). - if the server name is present, we repead these operations but we only send the TX cache entry ID. Upon receipt, the couple of (cache IDs, server name) are stored the LRU cache used only upon receipt (struct dcache_rx). As the peers protocol is symetrical, the fact that the server name is present in the received data (resp. or not) denotes if the entry is absent (resp. or not).
134 lines
4.3 KiB
C
134 lines
4.3 KiB
C
/*
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* include/types/peers.h
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* This file defines everything related to peers.
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*
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* Copyright 2010 EXCELIANCE, Emeric Brun <ebrun@exceliance.fr>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _TYPES_PEERS_H
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#define _TYPES_PEERS_H
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <common/config.h>
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#include <common/mini-clist.h>
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#include <common/regex.h>
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#include <common/tools.h>
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#include <eb32tree.h>
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#include <types/dict.h>
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struct shared_table {
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struct stktable *table; /* stick table to sync */
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int local_id;
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int remote_id;
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int flags;
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uint64_t remote_data;
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unsigned int last_acked;
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unsigned int last_pushed;
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unsigned int last_get;
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unsigned int teaching_origin;
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unsigned int update;
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struct shared_table *next; /* next shared table in list */
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};
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struct peer {
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int local; /* proxy state */
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char *id;
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struct {
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const char *file; /* file where the section appears */
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int line; /* line where the section appears */
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} conf; /* config information */
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time_t last_change;
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struct sockaddr_storage addr; /* peer address */
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struct protocol *proto; /* peer address protocol */
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struct xprt_ops *xprt; /* peer socket operations at transport layer */
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void *sock_init_arg; /* socket operations's opaque init argument if needed */
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unsigned int flags; /* peer session flags */
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unsigned int statuscode; /* current/last session status code */
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unsigned int reconnect; /* next connect timer */
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unsigned int heartbeat; /* next heartbeat timer */
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unsigned int confirm; /* confirm message counter */
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struct appctx *appctx; /* the appctx running it */
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struct shared_table *remote_table;
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struct shared_table *last_local_table;
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struct shared_table *tables;
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struct server *srv;
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struct dcache *dcache; /* dictionary cache */
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__decl_hathreads(HA_SPINLOCK_T lock); /* lock used to handle this peer section */
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struct peer *next; /* next peer in the list */
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};
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struct peers {
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int state; /* proxy state */
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char *id; /* peer section name */
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struct task *sync_task; /* main sync task */
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struct sig_handler *sighandler; /* signal handler */
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struct peer *remote; /* remote peers list */
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struct peer *local; /* local peer list */
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struct proxy *peers_fe; /* peer frontend */
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struct {
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const char *file; /* file where the section appears */
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int line; /* line where the section appears */
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} conf; /* config information */
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time_t last_change;
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struct peers *next; /* next peer section */
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unsigned int flags; /* current peers section resync state */
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unsigned int resync_timeout; /* resync timeout timer */
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int count; /* total of peers */
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};
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/* LRU cache for dictionaies */
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struct dcache_tx {
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/* The last recently used key */
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unsigned int lru_key;
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/* The maximum number of entries in this cache */
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size_t max_entries;
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/* ebtree for keys (eb32_nodes from 0 included up to <max_entries> excluded) */
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struct eb_root keys;
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/* ebtree for values (ebpt_node, pointers to dict struct entries) */
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struct eb_root values;
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};
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struct dcache_rx {
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unsigned int id;
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struct dict_entry *de;
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};
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struct dcache_tx_entry {
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struct eb32_node key;
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struct ebpt_node value;
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};
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/* stick-table data type cache */
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struct dcache {
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/* Cache used upon transmission */
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struct dcache_tx *tx;
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/* Cache used upon receipt */
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struct dcache_rx *rx;
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/* Maximum number of entries in this cache */
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size_t max_entries;
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};
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extern struct peers *cfg_peers;
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#endif /* _TYPES_PEERS_H */
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