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pool.h
1 /* TDSPool - Connection pooling for TDS based databases
2 * Copyright (C) 2001 Brian Bruns
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 */
19
20 #ifndef _pool_h_
21 #define _pool_h_
22
23 #if HAVE_SYS_TYPES_H
24 #include <sys/types.h>
25 #endif
26
27 #if HAVE_NETINET_IN_H
28 #include <netinet/in.h>
29 #endif
30
31 /*
32 * POSIX says fd_set type may be defined in either sys/select.h or sys/time.h.
33 */
34 #if HAVE_SYS_TIME_H
35 #include <sys/time.h>
36 #endif
37
38 #include "tds.h"
39
40 TDS_RCSID(pool_h, "$Id: pool.h,v 1.15 2006-06-12 19:45:59 freddy77 Exp $");
41
42 /* defines */
43 #define PGSIZ 2048
44 #define BLOCKSIZ 512
45 #define MAX_POOL_USERS 1024
46
47 /* enums and typedefs */
48 typedef enum
49 {
50 TDS_SRV_LOGIN,
51 TDS_SRV_IDLE,
52 TDS_SRV_QUERY,
53 TDS_SRV_WAIT, /* if no members are free wait */
54 TDS_SRV_CANCEL,
55 TDS_SRV_DEAD
56 } TDS_USER_STATE;
57
58 /* forward declaration */
59 typedef struct tds_pool_member TDS_POOL_MEMBER;
60
61
62 typedef struct tds_pool_user
63 {
64 TDSSOCKET *tds;
65 TDS_USER_STATE user_state;
66 TDS_POOL_MEMBER *assigned_member;
67 }
68 TDS_POOL_USER;
69
70 struct tds_pool_member
71 {
72 TDSSOCKET *tds;
73 /* sometimes we get a partial packet */
74 int need_more;
75 int state;
76 time_t last_used_tm;
77 TDS_POOL_USER *current_user;
78 /*
79 * these variables are used for tracking the state of the TDS protocol
80 * so we know when to return the state to TDS_IDLE.
81 */
82 int num_bytes_left;
83 unsigned char fragment[PGSIZ];
84 };
85
86 typedef struct tds_pool
87 {
88 char *name;
89 char *user;
90 char *password;
91 char *server;
92 char *database;
93 int port;
94 int max_member_age; /* in seconds */
95 int min_open_conn;
96 int max_open_conn;
97 int num_members;
98 TDS_POOL_MEMBER *members;
99 int max_users;
100 TDS_POOL_USER *users;
101 }
102 TDS_POOL;
103
104 /* prototypes */
105
106 /* member.c */
107 int pool_process_members(TDS_POOL * pool, fd_set * fds);
108 TDS_POOL_MEMBER *pool_find_idle_member(TDS_POOL * pool);
109 void pool_mbr_init(TDS_POOL * pool);
110 void pool_free_member(TDS_POOL_MEMBER * pmbr);
111 void pool_assign_member(TDS_POOL_MEMBER * pmbr, TDS_POOL_USER *puser);
112 void pool_deassign_member(TDS_POOL_MEMBER * pmbr);
113 void pool_reset_member(TDS_POOL_MEMBER * pmbr);
114
115 /* user.c */
116 int pool_process_users(TDS_POOL * pool, fd_set * fds);
117 void pool_user_init(TDS_POOL * pool);
118 TDS_POOL_USER *pool_user_create(TDS_POOL * pool, TDS_SYS_SOCKET s, struct sockaddr_in *sin);
119 void pool_free_user(TDS_POOL_USER * puser);
120 void pool_user_query(TDS_POOL * pool, TDS_POOL_USER * puser);
121
122 /* util.c */
123 void dump_buf(const void *buf, int length);
124 void dump_login(TDSLOGIN * login);
125 void die_if(int expr, const char *msg);
126
127 /* config.c */
128 int pool_read_conf_file(char *poolname, TDS_POOL * pool);
129
130
131 #endif