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# pool.h

    00001 /* TDSPool - Connection pooling for TDS based databases
    00002  * Copyright (C) 2001 Brian Bruns
    00003  *
    00004  * This program is free software; you can redistribute it and/or modify
    00005  * it under the terms of the GNU General Public License as published by
    00006  * the Free Software Foundation; either version 2 of the License, or
    00007  * (at your option) any later version.
    00008  *
    00009  * This program is distributed in the hope that it will be useful,
    00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00012  * GNU General Public License for more details.
    00013  *
    00014  * You should have received a copy of the GNU General Public License
    00015  * along with this program; if not, write to the Free Software
    00016  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    00017  *
    00018  */
    00019
    00020 #ifndef _pool_h_
    00021 #define _pool_h_
    00022
    00023 static char rcsid_pool_h[] = "$Id: pool.h,v 1.9 2003/12/22 08:32:14 freddy77 Exp $";
    00024 static void *no_unused_var_warn_pool_h[] = { rcsid_pool_h, no_unused_var_warn_pool_h };
    00025
    00026 #if HAVE_SYS_TYPES_H
    00027 #include <sys/types.h>
    00028 #endif /* HAVE_SYS_TYPES_H */
    00029
    00030 #if HAVE_NETINET_IN_H
    00031 #include <netinet/in.h>
    00032 #endif /* HAVE_NETINET_IN_H */
    00033
    00034 #include "tds.h"
    00035
    00036 /* defines */
    00037 #define PGSIZ 2048
    00038 #define BLOCKSIZ 512
    00039 #define MAX_POOL_USERS 1024
    00040
    00041 /* enums and typedefs */
    00042 enum
    00043 {
    00044         TDS_SRV_LOGIN,
    00045         TDS_SRV_IDLE,
    00046         TDS_SRV_QUERY,
    00047         TDS_SRV_WAIT,           /* if no members are free wait */
    00048         TDS_SRV_CANCEL,
    00049         TDS_SRV_DEAD
    00050 };
    00051
    00052 typedef struct tds_pool_user
    00053 {
    00054         TDSSOCKET *tds;
    00055         int user_state;
    00056 }
    00057 TDS_POOL_USER;
    00058
    00059 typedef struct tds_pool_member
    00060 {
    00061         TDSSOCKET *tds;
    00062         /* sometimes we get a partial packet */
    00063         int need_more;
    00064         int state;
    00065         time_t last_used_tm;
    00066         TDS_POOL_USER *current_user;
    00067         /*
    00068          * ** these variables are used for tracking the state of the TDS protocol
    00069          * ** so we know when to return the state to TDS_IDLE.
    00070          */
    00071         int num_bytes_left;
    00072         unsigned char fragment[PGSIZ];
    00073 }
    00074 TDS_POOL_MEMBER;
    00075
    00076 typedef struct tds_pool
    00077 {
    00078         char *name;
    00079         char *user;
    00080         char *password;
    00081         char *server;
    00082         char *database;
    00083         int port;
    00084         int max_member_age;     /* in seconds */
    00085         int min_open_conn;
    00086         int max_open_conn;
    00087         int num_members;
    00088         TDS_POOL_MEMBER *members;
    00089         int max_users;
    00090         TDS_POOL_USER *users;
    00091 }
    00092 TDS_POOL;
    00093
    00094 /* prototypes */
    00095 /* main.c */
    00096 TDS_POOL *pool_init(char *name);
    00097 void pool_main_loop(TDS_POOL * pool);
    00098
    00099 /* member.c */
    00100 int pool_process_members(TDS_POOL * pool, fd_set * fds);
    00101 TDSSOCKET *pool_mbr_login(TDS_POOL * pool);
    00102 TDS_POOL_MEMBER *pool_find_idle_member(TDS_POOL * pool);
    00103 void pool_mbr_init(TDS_POOL * pool);
    00104
    00105 /* user.c */
    00106 int pool_process_users(TDS_POOL * pool, fd_set * fds);
    00107 void pool_user_init(TDS_POOL * pool);
    00108 TDS_POOL_USER *pool_user_create(TDS_POOL * pool, int s, struct sockaddr_in *sin);
    00109 void pool_free_user(TDS_POOL_USER * puser);
    00110 void pool_user_read(TDS_POOL * pool, TDS_POOL_USER * puser);
    00111 int pool_user_login(TDS_POOL * pool, TDS_POOL_USER * puser);
    00112 void pool_user_query(TDS_POOL * pool, TDS_POOL_USER * puser);
    00113
    00114 /* util.c */
    00115 void dump_buf(const void *buf, int length);
    00116 void dump_login(TDSLOGIN * login);
    00117 void die_if(int expr, const char *msg);
    00118
    00119 /* stream.c */
    00120 int pool_find_end_token(TDS_POOL_MEMBER * pmbr, const unsigned char *buf, int len);
    00121
    00122 /* config.c */
    00123 int pool_read_conf_file(char *poolname, TDS_POOL * pool);
    00124
    00125
    00126 #endif