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/*
* include/proto/backend.h
* Functions prototypes for the backend.
*
* Copyright (C) 2000-2012 Willy Tarreau - w@1wt.eu
*
* 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 _PROTO_BACKEND_H
#define _PROTO_BACKEND_H
#include <common/config.h>
#include <common/time.h>
#include <types/backend.h>
#include <types/proxy.h>
#include <types/server.h>
#include <types/stream.h>
int assign_server(struct stream *s);
int assign_server_address(struct stream *s, struct connection *srv_conn);
int assign_server_and_queue(struct stream *s);
int connect_server(struct stream *s);
int srv_redispatch_connect(struct stream *t);
const char *backend_lb_algo_str(int algo);
int backend_parse_balance(const char **args, char **err, struct proxy *curproxy);
int tcp_persist_rdp_cookie(struct stream *s, struct channel *req, int an_bit);
int be_downtime(struct proxy *px);
void recount_servers(struct proxy *px);
void update_backend_weight(struct proxy *px);
int be_lastsession(const struct proxy *be);
/* Returns number of usable servers in backend */
static inline int be_usable_srv(struct proxy *be)
{
if (be->state == PR_STSTOPPED)
return 0;
else if (be->srv_act)
return be->srv_act;
else if (be->lbprm.fbck)
return 1;
else
return be->srv_bck;
}
/* set the time of last session on the backend */
static inline void be_set_sess_last(struct proxy *be)
{
be->be_counters.last_sess = now.tv_sec;
}
/* This function returns non-zero if the designated server will be
* usable for LB according to pending weight and state.
* Otherwise it returns 0.
*/
static inline int srv_willbe_usable(const struct server *srv)
{
enum srv_state state = srv->next_state;
if (!srv->next_eweight)
return 0;
if (srv->next_admin & SRV_ADMF_MAINT)
return 0;
if (srv->next_admin & SRV_ADMF_DRAIN)
return 0;
switch (state) {
case SRV_ST_STARTING:
case SRV_ST_RUNNING:
return 1;
case SRV_ST_STOPPING:
case SRV_ST_STOPPED:
return 0;
}
return 0;
}
/* This function returns non-zero if the designated server was usable for LB
* according to its current weight and state. Otherwise it returns 0.
*/
static inline int srv_currently_usable(const struct server *srv)
{
enum srv_state state = srv->cur_state;
if (!srv->cur_eweight)
return 0;
if (srv->cur_admin & SRV_ADMF_MAINT)
return 0;
if (srv->cur_admin & SRV_ADMF_DRAIN)
return 0;
switch (state) {
case SRV_ST_STARTING:
case SRV_ST_RUNNING:
return 1;
case SRV_ST_STOPPING:
case SRV_ST_STOPPED:
return 0;
}
return 0;
}
/* This function commits the next server state and weight onto the current
* ones in order to detect future changes. The server's lock is expected to
* be held when calling this function.
*/
static inline void srv_lb_commit_status(struct server *srv)
{
srv->cur_state = srv->next_state;
srv->cur_admin = srv->next_admin;
srv->cur_eweight = srv->next_eweight;
}
/* This function returns true when a server has experienced a change since last
* commit on its state or weight, otherwise zero.
*/
static inline int srv_lb_status_changed(const struct server *srv)
{
return (srv->next_state != srv->cur_state ||
srv->next_admin != srv->cur_admin ||
srv->next_eweight != srv->cur_eweight);
}
/* sends a log message when a backend goes down, and also sets last
* change date.
*/
void set_backend_down(struct proxy *be);
#endif /* _PROTO_BACKEND_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/