136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/*
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* include/proto/backend.h
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* Functions prototypes for the backend.
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*
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* Copyright (C) 2000-2012 Willy Tarreau - w@1wt.eu
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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 _PROTO_BACKEND_H
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#define _PROTO_BACKEND_H
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#include <common/config.h>
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#include <common/time.h>
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#include <types/backend.h>
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#include <types/proxy.h>
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#include <types/server.h>
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#include <types/session.h>
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int assign_server(struct session *s);
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int assign_server_address(struct session *s);
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int assign_server_and_queue(struct session *s);
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int connect_server(struct session *s);
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int srv_redispatch_connect(struct session *t);
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const char *backend_lb_algo_str(int algo);
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int backend_parse_balance(const char **args, char **err, struct proxy *curproxy);
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int tcp_persist_rdp_cookie(struct session *s, struct channel *req, int an_bit);
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int be_downtime(struct proxy *px);
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void recount_servers(struct proxy *px);
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void update_backend_weight(struct proxy *px);
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struct server *get_server_sh(struct proxy *px, const char *addr, int len);
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struct server *get_server_uh(struct proxy *px, char *uri, int uri_len);
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int be_lastsession(const struct proxy *be);
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/* set the time of last session on the backend */
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static void inline be_set_sess_last(struct proxy *be)
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{
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be->be_counters.last_sess = now.tv_sec;
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}
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/* This function returns non-zero if the designated server is usable for LB
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* according to its current weight and current state. Otherwise it returns 0.
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*/
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static inline int srv_is_usable(const struct server *srv)
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{
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enum srv_state state = srv->state;
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if (!srv->eweight)
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return 0;
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if (srv->admin & SRV_ADMF_MAINT)
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return 0;
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if (srv->admin & SRV_ADMF_DRAIN)
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return 0;
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switch (state) {
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case SRV_ST_STARTING:
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case SRV_ST_RUNNING:
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return 1;
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case SRV_ST_STOPPING:
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case SRV_ST_STOPPED:
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return 0;
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}
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return 0;
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}
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/* This function returns non-zero if the designated server was usable for LB
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* according to its current weight and previous state. Otherwise it returns 0.
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*/
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static inline int srv_was_usable(const struct server *srv)
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{
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enum srv_state state = srv->prev_state;
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if (!srv->prev_eweight)
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return 0;
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if (srv->prev_admin & SRV_ADMF_MAINT)
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return 0;
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if (srv->prev_admin & SRV_ADMF_DRAIN)
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return 0;
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switch (state) {
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case SRV_ST_STARTING:
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case SRV_ST_RUNNING:
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return 1;
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case SRV_ST_STOPPING:
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case SRV_ST_STOPPED:
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return 0;
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}
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return 0;
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}
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/* This function commits the current server state and weight onto the previous
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* ones in order to detect future changes.
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*/
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static inline void srv_lb_commit_status(struct server *srv)
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{
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srv->prev_state = srv->state;
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srv->prev_admin = srv->admin;
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srv->prev_eweight = srv->eweight;
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}
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/* This function returns true when a server has experienced a change since last
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* commit on its state or weight, otherwise zero.
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*/
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static inline int srv_lb_status_changed(const struct server *srv)
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{
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return (srv->state != srv->prev_state ||
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srv->admin != srv->prev_admin ||
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srv->eweight != srv->prev_eweight);
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}
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/* sends a log message when a backend goes down, and also sets last
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* change date.
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*/
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void set_backend_down(struct proxy *be);
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#endif /* _PROTO_BACKEND_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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