1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/*
* include/haproxy/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 _HAPROXY_BACKEND_H
#define _HAPROXY_BACKEND_H
#include <haproxy/api.h>
#include <haproxy/backend-t.h>
#include <haproxy/clock.h>
#include <haproxy/proxy-t.h>
#include <haproxy/server-t.h>
#include <haproxy/stream-t.h>
#include <haproxy/time.h>
int assign_server(struct stream *s);
int assign_server_address(struct stream *s);
int assign_server_and_queue(struct stream *s);
int alloc_bind_address(struct sockaddr_storage **ss,
struct server *srv, struct proxy *be,
struct stream *s);
int srv_redispatch_connect(struct stream *t);
void back_try_conn_req(struct stream *s);
void back_handle_st_req(struct stream *s);
void back_handle_st_con(struct stream *s);
void back_handle_st_rdy(struct stream *s);
void back_handle_st_cer(struct stream *s);
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->flags & PR_FL_DISABLED)
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 = ns_to_sec(now_ns);
}
/* 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);
unsigned int gen_hash(const struct proxy* px, const char* key, unsigned long len);
#endif /* _HAPROXY_BACKEND_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
|
