cel_pgsql.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2008
 *
 * Steve Murphy - adapted to CEL, from:
 * Matthew D. Hardeman <[email protected]>
 * Adapted from the MySQL CDR logger originally by James Sharp
 *
 * Modified April, 2007; Dec, 2008
 * Steve Murphy <[email protected]>

 * Modified September 2003
 * Matthew D. Hardeman <[email protected]>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief PostgreSQL CEL logger
 *
 * \author Steve Murphy <[email protected]>
 * PostgreSQL http://www.postgresql.org/
 *
 * See also
 * \arg \ref Config_cel
 * PostgreSQL http://www.postgresql.org/
 * \ingroup cel_drivers
 */

/*** MODULEINFO
 <depend>pgsql</depend>
 <support_level>extended</support_level>
 ***/

#include "asterisk.h"

#include <libpq-fe.h>

#include "asterisk/config.h"
#include "asterisk/options.h"
#include "asterisk/channel.h"
#include "asterisk/cel.h"
#include "asterisk/module.h"
#include "asterisk/logger.h"
#include "asterisk.h"

#define DATE_FORMAT "%Y-%m-%d %T.%6q"

#define PGSQL_BACKEND_NAME "CEL PGSQL backend"

#define PGSQL_MIN_VERSION_SCHEMA 70300

static char *config = "cel_pgsql.conf";

static char *pghostname;
static char *pgdbname;
static char *pgdbuser;
static char *pgpassword;
static char *pgappname;
static char *pgdbport;
static char *table;
static char *schema;

static int connected = 0;
/* Optimization to reduce number of memory allocations */
static int maxsize = 512, maxsize2 = 512;
static int usegmtime = 0;

/*! \brief show_user_def is off by default */
#define CEL_SHOW_USERDEF_DEFAULT 0

/*! TRUE if we should set the eventtype field to USER_DEFINED on user events. */
static unsigned char cel_show_user_def;

AST_MUTEX_DEFINE_STATIC(pgsql_lock);

static PGconn *conn = NULL;
static PGresult *result = NULL;

struct columns {
 char *name;
 char *type;
 int len;
 unsigned int notnull:1;
 unsigned int hasdefault:1;
 AST_RWLIST_ENTRY(columns) list;
};

static AST_RWLIST_HEAD_STATIC(psql_columns, columns);

#define LENGTHEN_BUF(size, var_sql) \
 do { \
 /* Lengthen buffer, if necessary */ \
 if (ast_str_strlen(var_sql) + size + 1 > ast_str_size(var_sql)) { \
 if (ast_str_make_space(&var_sql, ((ast_str_size(var_sql) + size + 3) / 512 + 1) * 512) != 0) { \
 ast_log(LOG_ERROR, "Unable to allocate sufficient memory. Insert CEL '%s:%s' failed.\n", pghostname, table); \
 ast_free(sql); \
 ast_free(sql2); \
 AST_RWLIST_UNLOCK(&psql_columns); \
 return; \
 } \
 } \
 } while (0)

#define LENGTHEN_BUF1(size) \
 LENGTHEN_BUF(size, sql);
#define LENGTHEN_BUF2(size) \
 LENGTHEN_BUF(size, sql2);

static void pgsql_reconnect(void)
{
 struct ast_str *conn_info = ast_str_create(128);
 if (!conn_info) {
 ast_log(LOG_ERROR, "Failed to allocate memory for connection string.\n");
 return;
 }

 if (conn) {
 PQfinish(conn);
 conn = NULL;
 }

 ast_str_set(&conn_info, 0, "host=%s port=%s dbname=%s user=%s",
 pghostname, pgdbport, pgdbname, pgdbuser);

 if (!ast_strlen_zero(pgappname)) {
 ast_str_append(&conn_info, 0, " application_name=%s", pgappname);
 }

 if (!ast_strlen_zero(pgpassword)) {
 ast_str_append(&conn_info, 0, " password=%s", pgpassword);
 }

 conn = PQconnectdb(ast_str_buffer(conn_info));
 ast_free(conn_info);
}


static void pgsql_log(struct ast_event *event)
{
 struct ast_tm tm;
 char timestr[128];
 char *pgerror;
 struct ast_cel_event_record record = {
 .version = AST_CEL_EVENT_RECORD_VERSION,
 };

 if (ast_cel_fill_record(event, &record)) {
 return;
 }

 ast_mutex_lock(&pgsql_lock);

 ast_localtime(&record.event_time, &tm, usegmtime ? "GMT" : NULL);
 ast_strftime(timestr, sizeof(timestr), DATE_FORMAT, &tm);

 if ((!connected) && pghostname && pgdbuser && pgpassword && pgdbname) {
 pgsql_reconnect();
 if (PQstatus(conn) != CONNECTION_BAD) {
 connected = 1;
 } else {
 pgerror = PQerrorMessage(conn);
 ast_log(LOG_ERROR, "cel_pgsql: Unable to connect to database server %s. Calls will not be logged!\n", pghostname);
 ast_log(LOG_ERROR, "cel_pgsql: Reason: %s\n", pgerror);
 PQfinish(conn);
 conn = NULL;
 }
 }
 if (connected) {
 struct columns *cur;
 struct ast_str *sql = ast_str_create(maxsize), *sql2 = ast_str_create(maxsize2);
 char buf[257];
 char *escapebuf = NULL;
 const char *value;
 int first = 1;
 size_t bufsize = 513;

 escapebuf = ast_malloc(bufsize);
 if (!escapebuf || !sql || !sql2) {
 goto ast_log_cleanup;
 }

 ast_str_set(&sql, 0, "INSERT INTO %s (", table);
 ast_str_set(&sql2, 0, " VALUES (");

#define SEP (first ? "" : ",")

 AST_RWLIST_RDLOCK(&psql_columns);
 AST_RWLIST_TRAVERSE(&psql_columns, cur, list) {
 LENGTHEN_BUF1(strlen(cur->name) + 2);
 ast_str_append(&sql, 0, "%s\"%s\"", SEP, cur->name);

 if (strcmp(cur->name, "eventtime") == 0) {
 if (strncmp(cur->type, "int", 3) == 0) {
 LENGTHEN_BUF2(13);
 ast_str_append(&sql2, 0, "%s%ld", SEP, (long) record.event_time.tv_sec);
 } else if (strncmp(cur->type, "float", 5) == 0) {
 LENGTHEN_BUF2(31);
 ast_str_append(&sql2, 0, "%s%f",
 SEP,
 (double) record.event_time.tv_sec +
 (double) record.event_time.tv_usec / 1000000.0);
 } else {
 /* char, hopefully */
 LENGTHEN_BUF2(31);
 ast_localtime(&record.event_time, &tm, usegmtime ? "GMT" : NULL);
 ast_strftime(buf, sizeof(buf), DATE_FORMAT, &tm);
 ast_str_append(&sql2, 0, "%s'%s'", SEP, buf);
 }
 } else if (strcmp(cur->name, "eventtype") == 0) {
 if (cur->type[0] == 'i') {
 /* Get integer, no need to escape anything */
 LENGTHEN_BUF2(5);
 ast_str_append(&sql2, 0, "%s%d", SEP, (int) record.event_type);
 } else if (strncmp(cur->type, "float", 5) == 0) {
 LENGTHEN_BUF2(31);
 ast_str_append(&sql2, 0, "%s%f", SEP, (double) record.event_type);
 } else {
 /* Char field, probably */
 const char *event_name;

 event_name = (!cel_show_user_def
 && record.event_type == AST_CEL_USER_DEFINED)
 ? record.user_defined_name : record.event_name;
 LENGTHEN_BUF2(strlen(event_name) + 1);
 ast_str_append(&sql2, 0, "%s'%s'", SEP, event_name);
 }
 } else if (strcmp(cur->name, "amaflags") == 0) {
 if (strncmp(cur->type, "int", 3) == 0) {
 /* Integer, no need to escape anything */
 LENGTHEN_BUF2(13);
 ast_str_append(&sql2, 0, "%s%u", SEP, record.amaflag);
 } else {
 /* Although this is a char field, there are no special characters in the values for these fields */
 LENGTHEN_BUF2(31);
 ast_str_append(&sql2, 0, "%s'%u'", SEP, record.amaflag);
 }
 } else {
 /* Arbitrary field, could be anything */
 if (strcmp(cur->name, "userdeftype") == 0) {
 value = record.user_defined_name;
 } else if (strcmp(cur->name, "cid_name") == 0) {
 value = record.caller_id_name;
 } else if (strcmp(cur->name, "cid_num") == 0) {
 value = record.caller_id_num;
 } else if (strcmp(cur->name, "cid_ani") == 0) {
 value = record.caller_id_ani;
 } else if (strcmp(cur->name, "cid_rdnis") == 0) {
 value = record.caller_id_rdnis;
 } else if (strcmp(cur->name, "cid_dnid") == 0) {
 value = record.caller_id_dnid;
 } else if (strcmp(cur->name, "exten") == 0) {
 value = record.extension;
 } else if (strcmp(cur->name, "context") == 0) {
 value = record.context;
 } else if (strcmp(cur->name, "channame") == 0) {
 value = record.channel_name;
 } else if (strcmp(cur->name, "appname") == 0) {
 value = record.application_name;
 } else if (strcmp(cur->name, "appdata") == 0) {
 value = record.application_data;
 } else if (strcmp(cur->name, "accountcode") == 0) {
 value = record.account_code;
 } else if (strcmp(cur->name, "peeraccount") == 0) {
 value = record.peer_account;
 } else if (strcmp(cur->name, "uniqueid") == 0) {
 value = record.unique_id;
 } else if (strcmp(cur->name, "linkedid") == 0) {
 value = record.linked_id;
 } else if (strcmp(cur->name, "userfield") == 0) {
 value = record.user_field;
 } else if (strcmp(cur->name, "peer") == 0) {
 value = record.peer;
 } else if (strcmp(cur->name, "extra") == 0) {
 value = record.extra;
 } else {
 value = NULL;
 }

 if (value == NULL) {
 ast_str_append(&sql2, 0, "%sDEFAULT", SEP);
 } else if (strncmp(cur->type, "int", 3) == 0) {
 long long whatever;
 if (value && sscanf(value, "%30lld", &whatever) == 1) {
 LENGTHEN_BUF2(26);
 ast_str_append(&sql2, 0, "%s%lld", SEP, whatever);
 } else {
 LENGTHEN_BUF2(2);
 ast_str_append(&sql2, 0, "%s0", SEP);
 }
 } else if (strncmp(cur->type, "float", 5) == 0) {
 long double whatever;
 if (value && sscanf(value, "%30Lf", &whatever) == 1) {
 LENGTHEN_BUF2(51);
 ast_str_append(&sql2, 0, "%s%30Lf", SEP, whatever);
 } else {
 LENGTHEN_BUF2(2);
 ast_str_append(&sql2, 0, "%s0", SEP);
 }
 /* XXX Might want to handle dates, times, and other misc fields here XXX */
 } else {
 if (value) {
 size_t required_size = strlen(value) * 2 + 1;

 /* If our argument size exceeds our buffer, grow it,
 * as PQescapeStringConn() expects the buffer to be
 * adequitely sized and does *NOT* do size checking.
 */
 if (required_size > bufsize) {
 char *tmpbuf = ast_realloc(escapebuf, required_size);

 if (!tmpbuf) {
 AST_RWLIST_UNLOCK(&psql_columns);
 goto ast_log_cleanup;
 }

 escapebuf = tmpbuf;
 bufsize = required_size;
 }
 PQescapeStringConn(conn, escapebuf, value, strlen(value), NULL);
 } else {
 escapebuf[0] = '\0';
 }
 LENGTHEN_BUF2(strlen(escapebuf) + 3);
 ast_str_append(&sql2, 0, "%s'%s'", SEP, escapebuf);
 }
 }
 first = 0;
 }
 AST_RWLIST_UNLOCK(&psql_columns);
 LENGTHEN_BUF1(ast_str_strlen(sql2) + 2);
 ast_str_append(&sql, 0, ")%s)", ast_str_buffer(sql2));

 ast_debug(3, "Inserting a CEL record: [%s].\n", ast_str_buffer(sql));
 /* Test to be sure we're still connected... */
 /* If we're connected, and connection is working, good. */
 /* Otherwise, attempt reconnect. If it fails... sorry... */
 if (PQstatus(conn) == CONNECTION_OK) {
 connected = 1;
 } else {
 ast_log(LOG_WARNING, "Connection was lost... attempting to reconnect.\n");
 PQreset(conn);
 if (PQstatus(conn) == CONNECTION_OK) {
 ast_log(LOG_NOTICE, "Connection reestablished.\n");
 connected = 1;
 } else {
 pgerror = PQerrorMessage(conn);
 ast_log(LOG_ERROR, "Unable to reconnect to database server %s. Calls will not be logged!\n", pghostname);
 ast_log(LOG_ERROR, "Reason: %s\n", pgerror);
 PQfinish(conn);
 conn = NULL;
 connected = 0;
 goto ast_log_cleanup;
 }
 }
 result = PQexec(conn, ast_str_buffer(sql));
 if (PQresultStatus(result) != PGRES_COMMAND_OK) {
 pgerror = PQresultErrorMessage(result);
 ast_log(LOG_WARNING, "Failed to insert call detail record into database!\n");
 ast_log(LOG_WARNING, "Reason: %s\n", pgerror);
 ast_log(LOG_WARNING, "Connection may have been lost... attempting to reconnect.\n");
 PQreset(conn);
 if (PQstatus(conn) == CONNECTION_OK) {
 ast_log(LOG_NOTICE, "Connection reestablished.\n");
 connected = 1;
 PQclear(result);
 result = PQexec(conn, ast_str_buffer(sql));
 if (PQresultStatus(result) != PGRES_COMMAND_OK) {
 pgerror = PQresultErrorMessage(result);
 ast_log(LOG_ERROR, "HARD ERROR! Attempted reconnection failed. DROPPING CALL RECORD!\n");
 ast_log(LOG_ERROR, "Reason: %s\n", pgerror);
 }
 }
 }
 PQclear(result);

 /* Next time, just allocate buffers that are that big to start with. */
 if (ast_str_strlen(sql) > maxsize) {
 maxsize = ast_str_strlen(sql);
 }
 if (ast_str_strlen(sql2) > maxsize2) {
 maxsize2 = ast_str_strlen(sql2);
 }

ast_log_cleanup:
 ast_free(sql);
 ast_free(sql2);
 ast_free(escapebuf);
 }

 ast_mutex_unlock(&pgsql_lock);
}

static int my_unload_module(void)
{
 struct columns *current;

 ast_cel_backend_unregister(PGSQL_BACKEND_NAME);
 AST_RWLIST_WRLOCK(&psql_columns);
 if (conn) {
 PQfinish(conn);
 conn = NULL;
 }
 if (pghostname) {
 ast_free(pghostname);
 pghostname = NULL;
 }
 if (pgdbname) {
 ast_free(pgdbname);
 pgdbname = NULL;
 }
 if (pgdbuser) {
 ast_free(pgdbuser);
 pgdbuser = NULL;
 }
 if (pgpassword) {
 ast_free(pgpassword);
 pgpassword = NULL;
 }
 if (pgappname) {
 ast_free(pgappname);
 pgappname = NULL;
 }
 if (pgdbport) {
 ast_free(pgdbport);
 pgdbport = NULL;
 }
 if (table) {
 ast_free(table);
 table = NULL;
 }
 if (schema) {
 ast_free(schema);
 schema = NULL;
 }
 while ((current = AST_RWLIST_REMOVE_HEAD(&psql_columns, list))) {
 ast_free(current);
 }
 AST_RWLIST_UNLOCK(&psql_columns);
 return 0;
}

static int unload_module(void)
{
 return my_unload_module();
}

static int process_my_load_module(struct ast_config *cfg)
{
 struct ast_variable *var;
 char *pgerror;
 const char *tmp;
 PGresult *result;
 struct columns *cur;

 if (!(var = ast_variable_browse(cfg, "global"))) {
 ast_log(LOG_WARNING,"CEL pgsql config file missing global section.\n");
 return AST_MODULE_LOAD_DECLINE;
 }
 if (!(tmp = ast_variable_retrieve(cfg,"global","hostname"))) {
 ast_log(LOG_WARNING,"PostgreSQL server hostname not specified. Assuming unix socket connection\n");
 tmp = ""; /* connect via UNIX-socket by default */
 }
 if (pghostname)
 ast_free(pghostname);
 if (!(pghostname = ast_strdup(tmp))) {
 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying host info\n");
 return AST_MODULE_LOAD_DECLINE;
 }
 if (!(tmp = ast_variable_retrieve(cfg, "global", "dbname"))) {
 ast_log(LOG_WARNING,"PostgreSQL database not specified. Assuming asterisk\n");
 tmp = "asteriskceldb";
 }
 if (pgdbname)
 ast_free(pgdbname);
 if (!(pgdbname = ast_strdup(tmp))) {
 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying dbname info\n");
 return AST_MODULE_LOAD_DECLINE;
 }
 if (!(tmp = ast_variable_retrieve(cfg, "global", "user"))) {
 ast_log(LOG_WARNING,"PostgreSQL database user not specified. Assuming asterisk\n");
 tmp = "asterisk";
 }
 if (pgdbuser)
 ast_free(pgdbuser);
 if (!(pgdbuser = ast_strdup(tmp))) {
 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying user info\n");
 return AST_MODULE_LOAD_DECLINE;
 }
 if (!(tmp = ast_variable_retrieve(cfg, "global", "password"))) {
 ast_log(LOG_WARNING, "PostgreSQL database password not specified. Assuming blank\n");
 tmp = "";
 }
 if (pgpassword)
 ast_free(pgpassword);
 if (!(pgpassword = ast_strdup(tmp))) {
 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying password info\n");
 return AST_MODULE_LOAD_DECLINE;
 }
 if (!(tmp = ast_variable_retrieve(cfg, "global", "appname"))) {
 tmp = "";
 }
 if (pgappname) {
 ast_free(pgappname);
 }
 if (!(pgappname = ast_strdup(tmp))) {
 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying appname info\n");
 return AST_MODULE_LOAD_DECLINE;
 }

 if (!(tmp = ast_variable_retrieve(cfg,"global","port"))) {
 ast_log(LOG_WARNING,"PostgreSQL database port not specified. Using default 5432.\n");
 tmp = "5432";
 }
 if (pgdbport)
 ast_free(pgdbport);
 if (!(pgdbport = ast_strdup(tmp))) {
 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying port info\n");
 return AST_MODULE_LOAD_DECLINE;
 }
 if (!(tmp = ast_variable_retrieve(cfg, "global", "table"))) {
 ast_log(LOG_WARNING,"CEL table not specified. Assuming cel\n");
 tmp = "cel";
 }
 if (table)
 ast_free(table);
 if (!(table = ast_strdup(tmp))) {
 return AST_MODULE_LOAD_DECLINE;
 }
 cel_show_user_def = CEL_SHOW_USERDEF_DEFAULT;
 if ((tmp = ast_variable_retrieve(cfg, "global", "show_user_defined"))) {
 cel_show_user_def = ast_true(tmp) ? 1 : 0;
 }
 if ((tmp = ast_variable_retrieve(cfg, "global", "usegmtime"))) {
 usegmtime = ast_true(tmp);
 } else {
 usegmtime = 0;
 }
 if (!(tmp = ast_variable_retrieve(cfg, "global", "schema"))) {
 tmp = "";
 }
 if (schema) {
 ast_free(schema);
 }
 if (!(schema = ast_strdup(tmp))) {
 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying schema info\n");
 return AST_MODULE_LOAD_DECLINE;
 }
 if (DEBUG_ATLEAST(3)) {
 if (ast_strlen_zero(pghostname)) {
 ast_log(LOG_DEBUG, "cel_pgsql: using default unix socket\n");
 } else {
 ast_log(LOG_DEBUG, "cel_pgsql: got hostname of %s\n", pghostname);
 }
 ast_log(LOG_DEBUG, "cel_pgsql: got port of %s\n", pgdbport);
 ast_log(LOG_DEBUG, "cel_pgsql: got user of %s\n", pgdbuser);
 ast_log(LOG_DEBUG, "cel_pgsql: got dbname of %s\n", pgdbname);
 ast_log(LOG_DEBUG, "cel_pgsql: got password of %s\n", pgpassword);
 ast_log(LOG_DEBUG, "cel_pgsql: got sql table name of %s\n", table);
 ast_log(LOG_DEBUG, "cel_pgsql: got show_user_defined of %s\n",
 cel_show_user_def ? "Yes" : "No");
 }

 pgsql_reconnect();
 if (PQstatus(conn) != CONNECTION_BAD) {
 char sqlcmd[768];
 char *fname, *ftype, *flen, *fnotnull, *fdef, *tablename, *tmp_tablename;
 int i, rows, version;

 ast_debug(1, "Successfully connected to PostgreSQL database.\n");
 connected = 1;

 version = PQserverVersion(conn);
 /* Remove any schema name from the table */
 if ((tmp_tablename = strrchr(table, '.'))) {
 tmp_tablename++;
 } else {
 tmp_tablename = table;
 }
 tablename = ast_alloca(strlen(tmp_tablename) * 2 + 1);
 PQescapeStringConn(conn, tablename, tmp_tablename, strlen(tmp_tablename), NULL);
 if (version >= PGSQL_MIN_VERSION_SCHEMA) {
 char *schemaname;
 int lenschema;
 lenschema = strlen(schema);
 schemaname = ast_alloca(lenschema * 2 + 1);
 PQescapeStringConn(conn, schemaname, schema, lenschema, NULL);

 snprintf(sqlcmd, sizeof(sqlcmd),
 "SELECT a.attname, t.typname, a.attlen, a.attnotnull, pg_catalog.pg_get_expr(d.adbin, d.adrelid) adsrc, a.atttypmod "
 "FROM (((pg_catalog.pg_class c INNER JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace "
 "AND c.relname = '%s' AND n.nspname = %s%s%s) "
 "INNER JOIN pg_catalog.pg_attribute a ON ("
 "NOT a.attisdropped) AND a.attnum > 0 AND a.attrelid = c.oid) "
 "INNER JOIN pg_catalog.pg_type t ON t.oid = a.atttypid) "
 "LEFT OUTER JOIN pg_attrdef d ON a.atthasdef AND d.adrelid = a.attrelid "
 "AND d.adnum = a.attnum "
 "ORDER BY n.nspname, c.relname, attnum",
 tablename,
 lenschema == 0 ? "" : "'", lenschema == 0 ? "current_schema()" : schemaname, lenschema == 0 ? "" : "'");
 } else {
 snprintf(sqlcmd, sizeof(sqlcmd),
 "SELECT a.attname, t.typname, a.attlen, a.attnotnull, d.adsrc, a.atttypmod "
 "FROM pg_class c, pg_type t, pg_attribute a "
 "LEFT OUTER JOIN pg_attrdef d ON a.atthasdef AND d.adrelid = a.attrelid "
 "AND d.adnum = a.attnum WHERE c.oid = a.attrelid AND a.atttypid = t.oid "
 "AND (a.attnum > 0) AND c.relname = '%s' ORDER BY c.relname, attnum", tablename);
 }
 /* Query the columns */
 result = PQexec(conn, sqlcmd);
 if (PQresultStatus(result) != PGRES_TUPLES_OK) {
 pgerror = PQresultErrorMessage(result);
 ast_log(LOG_ERROR, "Failed to query database columns: %s\n", pgerror);
 PQclear(result);
 unload_module();
 return AST_MODULE_LOAD_DECLINE;
 }

 rows = PQntuples(result);
 for (i = 0; i < rows; i++) {
 fname = PQgetvalue(result, i, 0);
 ftype = PQgetvalue(result, i, 1);
 flen = PQgetvalue(result, i, 2);
 fnotnull = PQgetvalue(result, i, 3);
 fdef = PQgetvalue(result, i, 4);
 ast_verb(4, "Found column '%s' of type '%s'\n", fname, ftype);
 cur = ast_calloc(1, sizeof(*cur) + strlen(fname) + strlen(ftype) + 2);
 if (cur) {
 sscanf(flen, "%30d", &cur->len);
 cur->name = (char *)cur + sizeof(*cur);
 cur->type = (char *)cur + sizeof(*cur) + strlen(fname) + 1;
 strcpy(cur->name, fname);
 strcpy(cur->type, ftype);
 if (*fnotnull == 't') {
 cur->notnull = 1;
 } else {
 cur->notnull = 0;
 }
 if (!ast_strlen_zero(fdef)) {
 cur->hasdefault = 1;
 } else {
 cur->hasdefault = 0;
 }
 AST_RWLIST_INSERT_TAIL(&psql_columns, cur, list);
 }
 }
 PQclear(result);
 } else {
 pgerror = PQerrorMessage(conn);
 ast_log(LOG_ERROR, "cel_pgsql: Unable to connect to database server %s. CALLS WILL NOT BE LOGGED!!\n", pghostname);
 ast_log(LOG_ERROR, "cel_pgsql: Reason: %s\n", pgerror);
 connected = 0;
 PQfinish(conn);
 conn = NULL;
 }
 return AST_MODULE_LOAD_SUCCESS;
}

static int my_load_module(int reload)
{
 struct ast_config *cfg;
 struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };

 if ((cfg = ast_config_load(config, config_flags)) == NULL || cfg == CONFIG_STATUS_FILEINVALID) {
 ast_log(LOG_WARNING, "Unable to load config for PostgreSQL CEL's: %s\n", config);
 return AST_MODULE_LOAD_DECLINE;
 } else if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
 return AST_MODULE_LOAD_SUCCESS;
 }

 if (reload) {
 my_unload_module();
 }

 process_my_load_module(cfg);
 ast_config_destroy(cfg);

 if (ast_cel_backend_register(PGSQL_BACKEND_NAME, pgsql_log)) {
 ast_log(LOG_WARNING, "Unable to subscribe to CEL events for pgsql\n");
 return AST_MODULE_LOAD_DECLINE;
 }

 return AST_MODULE_LOAD_SUCCESS;
}

static int load_module(void)
{
 return my_load_module(0);
}

static int reload(void)
{
 return my_load_module(1);
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PostgreSQL CEL Backend",
 .support_level = AST_MODULE_SUPPORT_EXTENDED,
 .load = load_module,
 .unload = unload_module,
 .reload = reload,
 .load_pri = AST_MODPRI_CDR_DRIVER,
 .requires = "cel",
);