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ul_db.c
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ul_db.c
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/* sp-ul_db module
*
* Copyright (C) 2007 1&1 Internet AG
*
* This file is part of Kamailio, a free SIP server.
*
* Kamailio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* Kamailio 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "../../lib/srdb1/db.h"
#include "ul_db.h"
#include "p_usrloc_mod.h"
#include "ul_db_failover.h"
#include "ul_db_ins.h"
#include "ul_db_repl.h"
#include "ul_db_ins_upd.h"
#include "ul_db_upd.h"
#include "ul_db_del.h"
#include "ul_db_query.h"
#include "ul_check.h"
#include "config.h"
#include <unistd.h>
ul_db_handle_t dbh_tmp;
ul_master_db_set_t mdb;
int required_caps = DB_CAP_QUERY | DB_CAP_RAW_QUERY | DB_CAP_INSERT | DB_CAP_DELETE | DB_CAP_UPDATE | DB_CAP_INSERT_UPDATE;
static char query[UL_DB_QUERY_LEN];
typedef struct db_dbf_dbres {
db1_res_t * res;
db_func_t * dbf;
} db_dbf_dbres_t;
#define UL_DB_RES_LIMIT 20
db_dbf_dbres_t results[UL_DB_RES_LIMIT];
static int add_dbf(db1_res_t * res, db_func_t * dbf);
static db_func_t * get_and_remove_dbf(db1_res_t * res);
int ul_db_init(void) {
mdb.read.url = &read_db_url;
mdb.write.url = &write_db_url;
memset(results, 0, sizeof(results));
if(write_on_master_db_shared->val){
if(db_bind_mod(mdb.write.url, &mdb.write.dbf) < 0) {
LM_ERR("could not bind api for write db.\n");
return -1;
}
if(!(mdb.write.dbf.cap & required_caps)) {
LM_ERR("db api of write db doesn't support required operation.\n");
return -1;
}
LM_INFO("write db initialized");
}
if(db_bind_mod(mdb.read.url, &mdb.read.dbf) < 0) {
LM_ERR("could not bind db api for read db.\n");
return -1;
}
if(!(mdb.read.dbf.cap & required_caps)) {
LM_ERR("db api of read db doesn't support required operation.\n");
return -1;
}
LM_INFO("read db initialized");
return 0;
}
int ul_db_child_init(void) {
if(mdb.read.dbh){
mdb.read.dbf.close(mdb.read.dbh);
mdb.read.dbh = NULL;
}
if(mdb.write.dbh){
mdb.write.dbf.close(mdb.write.dbh);
mdb.write.dbh = NULL;
}
if((mdb.read.dbh = mdb.read.dbf.init(mdb.read.url)) == NULL) {
LM_ERR("could not connect to sip master db (read).\n");
return -1;
}
LM_INFO("read db connection for children initialized");
if(ul_db_child_locnr_init() == -1) return -1;
LM_INFO("location number is %d\n", max_loc_nr);
lock_get(&write_on_master_db_shared->lock);
if(write_on_master_db_shared->val){
if((mdb.write.dbh = mdb.write.dbf.init(mdb.write.url)) == NULL) {
LM_ERR("could not connect to sip master db (write).\n");
lock_release(&write_on_master_db_shared->lock);
return -1;
}
LM_INFO("write db connection for children initialized");
}
lock_release(&write_on_master_db_shared->lock);
return 0;
}
int ul_db_child_locnr_init(void) {
if(!mdb.read.dbh){
LM_ERR("Sip master DB connection(read) is down");
return -1;
}
if(load_location_number(&mdb.read.dbf, mdb.read.dbh, &max_loc_nr) != 0){
LM_ERR("could not load location number\n");
return -1;
}
return 0;
}
void ul_db_shutdown(void) {
destroy_handles();
if(mdb.read.dbh){
mdb.read.dbf.close(mdb.read.dbh);
}
if(mdb.write.dbh){
mdb.write.dbf.close(mdb.write.dbh);
}
return;
}
int db_handle_error(ul_db_handle_t * handle, int no) {
int query_len;
ul_db_t * db;
int i;
str tmp;
if(!handle){
LM_ERR("NULL pointer in parameter.\n");
return -1;
}
lock_get(&write_on_master_db_shared->lock);
if(!write_on_master_db_shared->val){
lock_release(&write_on_master_db_shared->lock);
return 0;
}
lock_release(&write_on_master_db_shared->lock);
query_len = 35 + reg_table.len
+ error_col.len * 2 + id_col.len;
if(query_len > UL_DB_QUERY_LEN){
LM_ERR("query too long\n");
return -1;
}
if((db = get_db_by_num(handle, no)) == NULL){
LM_ERR("can't get db.\n");
return -1;
}
if (db->errors < cfg_get(p_usrloc, p_usrloc_cfg, db_err_threshold)) {
if (sprintf(query, "UPDATE %.*s "
"SET %.*s=%.*s+1 "
"WHERE %.*s=%i "
"AND %.*s=%i",
reg_table.len, reg_table.s,
error_col.len, error_col.s, error_col.len, error_col.s,
id_col.len, id_col.s, handle->id,
num_col.len, num_col.s, db->no) < 0) {
LM_ERR("could not print the query\n");
return -1;
}
tmp.s = query;
tmp.len = strlen(query);
if (mdb.write.dbf.raw_query (mdb.write.dbh, &tmp, NULL)) {
LM_ERR("error in database update.\n");
return -1;
}
}
for(i=0; i<DB_NUM; i++){
if (handle->db[i].dbh && handle->db[i].dbf.close){
handle->db[i].dbf.close(handle->db[i].dbh);
handle->db[i].dbh = NULL;
}
}
if(load_data(&mdb.read.dbf, mdb.read.dbh, &dbh_tmp, handle->id) < 0){
LM_ERR("could not load id %i\n", handle->id);
return -1;
}
refresh_handle(handle, &dbh_tmp, 0);
LM_ERR("error on id %i, db %i, "
"errors occurred: %i, threshold: %i\n",
handle->id, db->no, db->errors, cfg_get(p_usrloc, p_usrloc_cfg, db_err_threshold));
if(db->errors >= cfg_get(p_usrloc, p_usrloc_cfg, db_err_threshold)) {
LM_DBG("db_handle_error: now doing failover");
if((db_failover(&mdb.write.dbf, mdb.write.dbh, handle, no)) < 0) {
LM_ERR("error in doing failover.\n");
return -1;
}
if(load_data(&mdb.read.dbf, mdb.read.dbh, &dbh_tmp, handle->id) < 0){
return -1;
}
refresh_handle(handle, &dbh_tmp, 0);
set_must_refresh();
}
return 0;
}
int db_check_policy(int pol, int ok, int working) {
#define DB_POL_N_1 0
#define DB_POL_N_HALF 1
#define DB_POL_N_ALL 2
switch(policy) {
case DB_POL_N_1:
switch(pol) {
case DB_POL_OP: if(ok >= (DB_NUM - 1)) {
return 0;
} else {
return -1;
}
break;
case DB_POL_QUERY: if(ok >= 1) {
return 0;
} else {
return -1;
}
case DB_POL_MOD: if((ok == working) && (working >= (DB_NUM - 1))) {
return 0;
} else {
return -1;
}
default: LM_ERR("wrong mode given.\n");
return -1;
}
case DB_POL_N_HALF:
switch(pol) {
case DB_POL_OP: if(ok >= (DB_NUM / 2)) {
return 0;
} else {
return -1;
}
break;
case DB_POL_QUERY: if(ok >= 1) {
return 0;
} else {
return -1;
}
case DB_POL_MOD: if((ok == working) && (working >= (DB_NUM / 2))) {
return 0;
} else {
return -1;
}
default: LM_ERR("wrong mode given.\n");
return -1;
}
case DB_POL_N_ALL:
switch(pol) {
case DB_POL_OP: if(ok == DB_NUM) {
return 0;
} else {
return -1;
}
break;
case DB_POL_QUERY: if(ok >= 1) {
return 0;
} else {
return -1;
}
case DB_POL_MOD: if(ok == DB_NUM) {
return 0;
} else {
return -1;
}
default: LM_ERR("wrong mode given.\n");
return -1;
}
default:
return -1;
}
}
int ul_db_insert(str * table, str * first, str * second,
db_key_t* _k, db_val_t* _v, int _n) {
ul_db_handle_t * handle;
if(!db_write){
LM_ERR("not allowed in read only mode, abort.\n");
return -1;
}
if((handle = get_handle(&mdb.read.dbf, mdb.read.dbh, first, second)) == NULL) {
LM_ERR("could not retrieve db handle.\n");
return -1;
}
return db_insert(handle, table, _k, _v, _n);
}
int ul_db_replace(str * table, str * first, str * second,
db_key_t* _k, db_val_t* _v, int _n, int _un) {
ul_db_handle_t * handle;
if(!db_write){
LM_ERR("not allowed in read only mode, abort.\n");
return -1;
}
if((handle = get_handle(&mdb.read.dbf, mdb.read.dbh, first, second)) == NULL) {
LM_ERR("could not retrieve db handle.\n");
return -1;
}
return db_replace(handle, table, _k, _v, _n, _un);
}
int ul_db_update(str * table, str * first, str * second,
db_key_t* _k, db_op_t * _op, db_val_t* _v,
db_key_t* _uk, db_val_t* _uv, int _n, int _un) {
ul_db_handle_t * handle;
if(!db_write){
LM_ERR("not allowed in read only mode, abort.\n");
return -1;
}
if((handle = get_handle(&mdb.read.dbf, mdb.read.dbh, first, second)) == NULL) {
LM_ERR("could not retrieve db handle.\n");
return -1;
}
return db_update(handle, table, _k, _op, _v, _uk, _uv, _n, _un);
}
int ul_db_insert_update(str * table, str * first, str * second,
db_key_t* _k, db_val_t* _v, int _n) {
ul_db_handle_t * handle;
if(!db_write){
LM_ERR("not allowed in read only mode, abort.\n");
return -1;
}
if((handle = get_handle(&mdb.read.dbf, mdb.read.dbh, first, second)) == NULL) {
LM_ERR("could not retrieve db handle.\n");
return -1;
}
return db_insert_update(handle, table, _k, _v, _n);
}
int ul_db_delete(str * table, str * first, str * second,
db_key_t* _k, db_op_t* _o, db_val_t* _v, int _n) {
ul_db_handle_t * handle;
if(!db_write){
LM_ERR("not allowed in read only mode, abort.\n");
return -1;
}
if((handle = get_handle(&mdb.read.dbf, mdb.read.dbh, first, second)) == NULL) {
LM_ERR("could not retrieve db handle.\n");
return -1;
}
return db_delete(handle, table, _k, _o, _v, _n);
}
int ul_db_query(str * table, str * first, str * second, db1_con_t *** _r_h,
db_key_t* _k, db_op_t* _op, db_val_t* _v,
db_key_t* _c, int _n, int _nc, db_key_t _o, db1_res_t** _r) {
ul_db_handle_t * handle;
db_func_t * f;
int ret;
if((handle = get_handle(&mdb.read.dbf, mdb.read.dbh, first, second)) == NULL) {
LM_ERR("could not retrieve db handle.\n");
return -1;
}
lock_get(&write_on_master_db_shared->lock);
if((ret = db_query(handle, _r_h, &f, table, _k, _op, _v, _c, _n, _nc, _o, _r, write_on_master_db_shared->val)) < 0){
lock_release(&write_on_master_db_shared->lock);
return ret;
}
lock_release(&write_on_master_db_shared->lock);
add_dbf(*_r, f);
return ret;
}
int ul_db_free_result(db1_con_t ** dbh, db1_res_t * res){
db_func_t * f;
if(!dbh){
LM_ERR("NULL pointer in parameter.\n");
return -1;
}
if((f = get_and_remove_dbf(res)) == NULL){
return -1;
}
return f->free_result(*dbh, res);
}
int db_reactivate(ul_db_handle_t * handle, int no){
lock_get(&write_on_master_db_shared->lock);
if(!write_on_master_db_shared->val){
lock_release(&write_on_master_db_shared->lock);
LM_ERR("running in read only mode, abort.\n");
return -1;
}
lock_release(&write_on_master_db_shared->lock);
return db_failover_reactivate(&mdb.write.dbf, mdb.write.dbh, handle, no);
}
int db_reset_failover_time(ul_db_handle_t * handle, int no){
lock_get(&write_on_master_db_shared->lock);
if(!write_on_master_db_shared->val){
lock_release(&write_on_master_db_shared->lock);
LM_ERR("running in read only mode, abort.\n");
return -1;
}
lock_release(&write_on_master_db_shared->lock);
return db_failover_reset(&mdb.write.dbf, mdb.write.dbh, handle->id, no);
}
int ul_db_check(ul_db_handle_t * handle){
lock_get(&write_on_master_db_shared->lock);
if(write_on_master_db_shared->val){
lock_release(&write_on_master_db_shared->lock);
return check_handle(&mdb.write.dbf, mdb.write.dbh, handle);
} else {
lock_release(&write_on_master_db_shared->lock);
LM_ERR("checking is useless in read-only mode\n");
return 0;
}
}
static int add_dbf(db1_res_t * res, db_func_t * dbf){
int i=0;
for(i=0;i<UL_DB_RES_LIMIT;i++){
if(!results[i].res){
results[i].res = res;
results[i].dbf = dbf;
return 0;
}
}
LM_ERR("no free dbf tmp mem, maybe forgotten to cleanup result sets?\n");
return -1;
}
static db_func_t * get_and_remove_dbf(db1_res_t * res){
int i=0;
db_func_t * f;
for(i=0; i<UL_DB_RES_LIMIT; i++){
if(results[i].res == res){
f = results[i].dbf;
memset(&results[i], 0, sizeof(db_dbf_dbres_t));
return f;
}
}
LM_ERR("weird: dbf not found\n");
return NULL;
}