cdr_pgsql.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2003 - 2012
 *
 * Matthew D. Hardeman <mhardemn@papersoft.com>
 * Adapted from the MySQL CDR logger originally by James Sharp
 *
 * Modified September 2003
 * Matthew D. Hardeman <mhardemn@papersoft.com>
 *
 * 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 CDR logger
 *
 * \author Matthew D. Hardeman <mhardemn@papersoft.com>
 * PostgreSQL http://www.postgresql.org/
 * \ingroup cdr_drivers
 */
 
/*! \li \ref cdr_pgsql.c uses the configuration file \ref cdr_pgsql.conf
 * \addtogroup configuration_file Configuration Files
 */
 
/*!
 * \page cdr_pgsql.conf cdr_pgsql.conf
 * \verbinclude cdr_pgsql.conf.sample
 */
 
/*** MODULEINFO
    <depend>pgsql</depend>
    <support_level>extended</support_level>
 ***/
 
#include "asterisk.h"
 
#include <libpq-fe.h>
 
#include "asterisk/config.h"
#include "asterisk/channel.h"
#include "asterisk/cdr.h"
#include "asterisk/cli.h"
#include "asterisk/module.h"
 
#define DATE_FORMAT "'%Y-%m-%d %T'"
 
#define PGSQL_MIN_VERSION_SCHEMA 70300
 
static const char name[] = "pgsql";
static const char config[] = "cdr_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 *encoding;
static char *tz;
 
static int connected = 0;
/* Optimization to reduce number of memory allocations */
static int maxsize = 512, maxsize2 = 512;
static time_t connect_time = 0;
static int totalrecords = 0;
static int records;
 
static char *handle_cdr_pgsql_status(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
static struct ast_cli_entry cdr_pgsql_status_cli[] = {
        AST_CLI_DEFINE(handle_cdr_pgsql_status, "Show connection status of the PostgreSQL CDR driver (cdr_pgsql)"),
};
static struct ast_cli_entry cdr_pgsql_status_cli[] = {…};
 
AST_MUTEX_DEFINE_STATIC(pgsql_lock);
 
static PGconn   *conn = 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 CDR '%s:%s' failed.\n", pghostname, table); \
                        ast_free(sql); \
                        ast_free(sql2); \
                        AST_RWLIST_UNLOCK(&psql_columns); \
                        ast_mutex_unlock(&pgsql_lock); \
                        return -1; \
                    } \
                } \
            } while (0)
#define LENGTHEN_BUF(size, var_sql) \ …
 
#define LENGTHEN_BUF1(size) \
    LENGTHEN_BUF(size, sql);
#define LENGTHEN_BUF1(size) \ …
#define LENGTHEN_BUF2(size) \
    LENGTHEN_BUF(size, sql2);
#define LENGTHEN_BUF2(size) \ …
 
/*! \brief Handle the CLI command cdr show pgsql status */
static char *handle_cdr_pgsql_status(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    switch (cmd) {
    case CLI_INIT:
        e->command = "cdr show pgsql status";
        e->usage =
            "Usage: cdr show pgsql status\n"
            "       Shows current connection status for cdr_pgsql\n";
        return NULL;
    case CLI_GENERATE:
        return NULL;
    }
 
    if (a->argc != e->args)
        return CLI_SHOWUSAGE;
 
    if (connected) {
        char status[256];
        char status2[100] = "";
        char buf[362]; /* 256+100+" for "+NULL */
        int ctime = time(NULL) - connect_time;
 
        if (pgdbport) {
            snprintf(status, 255, "Connected to %s@%s, port %s", pgdbname, pghostname, pgdbport);
        } else {
            snprintf(status, 255, "Connected to %s@%s", pgdbname, pghostname);
        }
 
        if (pgdbuser && *pgdbuser) {
            snprintf(status2, 99, " with username %s", pgdbuser);
        }
        if (table && *table) {
            snprintf(status2, 99, " using table %s", table);
        }
 
        snprintf(buf, sizeof(buf), "%s%s for ", status, status2);
        ast_cli_print_timestr_fromseconds(a->fd, ctime, buf);
 
        if (records == totalrecords) {
            ast_cli(a->fd, "  Wrote %d records since last restart.\n", totalrecords);
        } else {
            ast_cli(a->fd, "  Wrote %d records since last restart and %d records since last reconnect.\n", totalrecords, records);
        }
    } else {
        ast_cli(a->fd, "Not currently connected to a PgSQL server.\n");
    }
    return CLI_SUCCESS;
}
static char *handle_cdr_pgsql_status(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a) {…}
 
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;
    }
 
    if (!ast_strlen_zero(pghostname)) {
        ast_str_append(&conn_info, 0, "host=%s ", pghostname);
    }
    if (!ast_strlen_zero(pgdbport)) {
        ast_str_append(&conn_info, 0, "port=%s ", pgdbport);
    }
    if (!ast_strlen_zero(pgdbname)) {
        ast_str_append(&conn_info, 0, "dbname=%s ", pgdbname);
    }
    if (!ast_strlen_zero(pgdbuser)) {
        ast_str_append(&conn_info, 0, "user=%s ", 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);
    }
    if (ast_str_strlen(conn_info) == 0) {
        ast_log(LOG_ERROR, "Connection string is blank.\n");
        return;
    }
 
    conn = PQconnectdb(ast_str_buffer(conn_info));
    ast_free(conn_info);
}
static void pgsql_reconnect(void) {…}
 
static int pgsql_log(struct ast_cdr *cdr)
{
    struct ast_tm tm;
    char *pgerror;
    PGresult *result;
    int res = -1;
 
    ast_mutex_lock(&pgsql_lock);
 
    if ((!connected) && pghostname && pgdbuser && pgpassword && pgdbname) {
        pgsql_reconnect();
 
        if (PQstatus(conn) != CONNECTION_BAD) {
            connected = 1;
            connect_time = time(NULL);
            records = 0;
            if (PQsetClientEncoding(conn, encoding)) {
#ifdef HAVE_PGSQL_pg_encoding_to_char
                ast_log(LOG_WARNING, "Failed to set encoding to '%s'.  Encoding set to default '%s'\n", encoding, pg_encoding_to_char(PQclientEncoding(conn)));
#else
                ast_log(LOG_WARNING, "Failed to set encoding to '%s'.  Encoding set to default.\n", encoding);
#endif
            }
        } else {
            pgerror = PQerrorMessage(conn);
            ast_log(LOG_ERROR, "Unable to connect to database server %s.  Calls will not be logged!\n", pghostname);
            ast_log(LOG_ERROR, "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, *value;
        char *separator = "";
        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 (");
 
        AST_RWLIST_RDLOCK(&psql_columns);
        AST_RWLIST_TRAVERSE(&psql_columns, cur, list) {
            /* For fields not set, simply skip them */
            ast_cdr_format_var(cdr, cur->name, &value, buf, sizeof(buf), 0);
            if (strcmp(cur->name, "calldate") == 0 && !value) {
                ast_cdr_format_var(cdr, "start", &value, buf, sizeof(buf), 0);
            }
            if (!value) {
                if (cur->notnull && !cur->hasdefault) {
                    /* Field is NOT NULL (but no default), must include it anyway */
                    LENGTHEN_BUF1(strlen(cur->name) + 2);
                    ast_str_append(&sql, 0, "%s\"%s\"", separator, cur->name);
                    LENGTHEN_BUF2(3);
                    ast_str_append(&sql2, 0, "%s''", separator);
                    separator = ", ";
                }
                continue;
            }
 
            LENGTHEN_BUF1(strlen(cur->name) + 2);
            ast_str_append(&sql, 0, "%s\"%s\"", separator, cur->name);
 
            if (strcmp(cur->name, "start") == 0 || strcmp(cur->name, "calldate") == 0) {
                if (strncmp(cur->type, "int", 3) == 0) {
                    LENGTHEN_BUF2(13);
                    ast_str_append(&sql2, 0, "%s%ld", separator, (long) cdr->start.tv_sec);
                } else if (strncmp(cur->type, "float", 5) == 0) {
                    LENGTHEN_BUF2(31);
                    ast_str_append(&sql2, 0, "%s%f", separator, (double)cdr->start.tv_sec + (double)cdr->start.tv_usec / 1000000.0);
                } else {
                    /* char, hopefully */
                    LENGTHEN_BUF2(31);
                    ast_localtime(&cdr->start, &tm, tz);
                    ast_strftime(buf, sizeof(buf), DATE_FORMAT, &tm);
                    ast_str_append(&sql2, 0, "%s%s", separator, buf);
                }
            } else if (strcmp(cur->name, "answer") == 0) {
                if (strncmp(cur->type, "int", 3) == 0) {
                    LENGTHEN_BUF2(13);
                    ast_str_append(&sql2, 0, "%s%ld", separator, (long) cdr->answer.tv_sec);
                } else if (strncmp(cur->type, "float", 5) == 0) {
                    LENGTHEN_BUF2(31);
                    ast_str_append(&sql2, 0, "%s%f", separator, (double)cdr->answer.tv_sec + (double)cdr->answer.tv_usec / 1000000.0);
                } else {
                    /* char, hopefully */
                    LENGTHEN_BUF2(31);
                    ast_localtime(&cdr->answer, &tm, tz);
                    ast_strftime(buf, sizeof(buf), DATE_FORMAT, &tm);
                    ast_str_append(&sql2, 0, "%s%s", separator, buf);
                }
            } else if (strcmp(cur->name, "end") == 0) {
                if (strncmp(cur->type, "int", 3) == 0) {
                    LENGTHEN_BUF2(13);
                    ast_str_append(&sql2, 0, "%s%ld", separator, (long) cdr->end.tv_sec);
                } else if (strncmp(cur->type, "float", 5) == 0) {
                    LENGTHEN_BUF2(31);
                    ast_str_append(&sql2, 0, "%s%f", separator, (double)cdr->end.tv_sec + (double)cdr->end.tv_usec / 1000000.0);
                } else {
                    /* char, hopefully */
                    LENGTHEN_BUF2(31);
                    ast_localtime(&cdr->end, &tm, tz);
                    ast_strftime(buf, sizeof(buf), DATE_FORMAT, &tm);
                    ast_str_append(&sql2, 0, "%s%s", separator, buf);
                }
            } else if (strcmp(cur->name, "duration") == 0 || strcmp(cur->name, "billsec") == 0) {
                if (cur->type[0] == 'i') {
                    /* Get integer, no need to escape anything */
                    ast_cdr_format_var(cdr, cur->name, &value, buf, sizeof(buf), 0);
                    LENGTHEN_BUF2(13);
                    ast_str_append(&sql2, 0, "%s%s", separator, value);
                } else if (strncmp(cur->type, "float", 5) == 0) {
                    struct timeval *when = cur->name[0] == 'd' ? &cdr->start : ast_tvzero(cdr->answer) ? &cdr->end : &cdr->answer;
                    LENGTHEN_BUF2(31);
                    ast_str_append(&sql2, 0, "%s%f", separator, (double) (ast_tvdiff_us(cdr->end, *when) / 1000000.0));
                } else {
                    /* Char field, probably */
                    struct timeval *when = cur->name[0] == 'd' ? &cdr->start : ast_tvzero(cdr->answer) ? &cdr->end : &cdr->answer;
                    LENGTHEN_BUF2(31);
                    ast_str_append(&sql2, 0, "%s'%f'", separator, (double) (ast_tvdiff_us(cdr->end, *when) / 1000000.0));
                }
            } else if (strcmp(cur->name, "disposition") == 0 || strcmp(cur->name, "amaflags") == 0) {
                if (strncmp(cur->type, "int", 3) == 0) {
                    /* Integer, no need to escape anything */
                    ast_cdr_format_var(cdr, cur->name, &value, buf, sizeof(buf), 1);
                    LENGTHEN_BUF2(13);
                    ast_str_append(&sql2, 0, "%s%s", separator, value);
                } else {
                    /* Although this is a char field, there are no special characters in the values for these fields */
                    ast_cdr_format_var(cdr, cur->name, &value, buf, sizeof(buf), 0);
                    LENGTHEN_BUF2(31);
                    ast_str_append(&sql2, 0, "%s'%s'", separator, value);
                }
            } else {
                /* Arbitrary field, could be anything */
                ast_cdr_format_var(cdr, cur->name, &value, buf, sizeof(buf), 0);
                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", separator, whatever);
                    } else {
                        LENGTHEN_BUF2(2);
                        ast_str_append(&sql2, 0, "%s0", separator);
                    }
                } 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", separator, whatever);
                    } else {
                        LENGTHEN_BUF2(2);
                        ast_str_append(&sql2, 0, "%s0", separator);
                    }
                /* 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
                         * adequately 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'", separator, escapebuf);
                }
            }
            separator = ", ";
        }
 
        LENGTHEN_BUF1(ast_str_strlen(sql2) + 2);
        AST_RWLIST_UNLOCK(&psql_columns);
        ast_str_append(&sql, 0, ")%s)", ast_str_buffer(sql2));
 
        ast_debug(3, "Inserting a CDR 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_ERROR, "Connection was lost... attempting to reconnect.\n");
            PQreset(conn);
            if (PQstatus(conn) == CONNECTION_OK) {
                ast_log(LOG_ERROR, "Connection reestablished.\n");
                connected = 1;
                connect_time = time(NULL);
                records = 0;
            } 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_ERROR, "Failed to insert call detail record into database!\n");
            ast_log(LOG_ERROR, "Reason: %s\n", pgerror);
            ast_log(LOG_ERROR, "Connection may have been lost... attempting to reconnect.\n");
            PQreset(conn);
            if (PQstatus(conn) == CONNECTION_OK) {
                ast_log(LOG_ERROR, "Connection reestablished.\n");
                connected = 1;
                connect_time = time(NULL);
                records = 0;
                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);
                } else {
                    /* Second try worked out ok */
                    totalrecords++;
                    records++;
                    res = 0;
                }
            }
        } else {
            totalrecords++;
            records++;
            res = 0;
        }
        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(escapebuf);
        ast_free(sql);
        ast_free(sql2);
    }
 
    ast_mutex_unlock(&pgsql_lock);
    return res;
}
static int pgsql_log(struct ast_cdr *cdr) {…}
 
/* This function should be called without holding the pgsql_columns lock */
static void empty_columns(void)
{
    struct columns *current;
    AST_RWLIST_WRLOCK(&psql_columns);
    while ((current = AST_RWLIST_REMOVE_HEAD(&psql_columns, list))) {
        ast_free(current);
    }
    AST_RWLIST_UNLOCK(&psql_columns);
 
}
static void empty_columns(void) {…}
 
static int unload_module(void)
{
    if (ast_cdr_unregister(name)) {
        return -1;
    }
 
    ast_cli_unregister_multiple(cdr_pgsql_status_cli, ARRAY_LEN(cdr_pgsql_status_cli));
 
    if (conn) {
        PQfinish(conn);
        conn = NULL;
    }
    ast_free(pghostname);
    ast_free(pgdbname);
    ast_free(pgdbuser);
    ast_free(pgpassword);
    ast_free(pgappname);
    ast_free(pgdbport);
    ast_free(table);
    ast_free(encoding);
    ast_free(tz);
 
    empty_columns();
 
    return 0;
}
static int unload_module(void) {…}
 
static int config_module(int reload)
{
    char *pgerror;
    struct columns *cur;
    PGresult *result;
    const char *tmp;
    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 CDR's: %s\n", config);
        return -1;
    } else if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
        return 0;
    }
 
    ast_mutex_lock(&pgsql_lock);
 
    if (!ast_variable_browse(cfg, "global")) {
        ast_config_destroy(cfg);
        ast_mutex_unlock(&pgsql_lock);
        ast_log(LOG_NOTICE, "cdr_pgsql configuration contains no global section, skipping module %s.\n",
            reload ? "reload" : "load");
        return -1;
    }
 
    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 */
    }
 
    ast_free(pghostname);
    if (!(pghostname = ast_strdup(tmp))) {
        ast_config_destroy(cfg);
        ast_mutex_unlock(&pgsql_lock);
        return -1;
    }
 
    if (!(tmp = ast_variable_retrieve(cfg, "global", "dbname"))) {
        ast_log(LOG_WARNING, "PostgreSQL database not specified.  Assuming asterisk\n");
        tmp = "asteriskcdrdb";
    }
 
    ast_free(pgdbname);
    if (!(pgdbname = ast_strdup(tmp))) {
        ast_config_destroy(cfg);
        ast_mutex_unlock(&pgsql_lock);
        return -1;
    }
 
    if (!(tmp = ast_variable_retrieve(cfg, "global", "user"))) {
        ast_log(LOG_WARNING, "PostgreSQL database user not specified.  Assuming asterisk\n");
        tmp = "asterisk";
    }
 
    ast_free(pgdbuser);
    if (!(pgdbuser = ast_strdup(tmp))) {
        ast_config_destroy(cfg);
        ast_mutex_unlock(&pgsql_lock);
        return -1;
    }
 
    if (!(tmp = ast_variable_retrieve(cfg, "global", "appname"))) {
        tmp = "";
    }
 
    ast_free(pgappname);
    if (!(pgappname = ast_strdup(tmp))) {
        ast_config_destroy(cfg);
        ast_mutex_unlock(&pgsql_lock);
        return -1;
    }
 
 
    if (!(tmp = ast_variable_retrieve(cfg, "global", "password"))) {
        ast_log(LOG_WARNING, "PostgreSQL database password not specified.  Assuming blank\n");
        tmp = "";
    }
 
    ast_free(pgpassword);
    if (!(pgpassword = ast_strdup(tmp))) {
        ast_config_destroy(cfg);
        ast_mutex_unlock(&pgsql_lock);
        return -1;
    }
 
    if (!(tmp = ast_variable_retrieve(cfg, "global", "port"))) {
        ast_log(LOG_WARNING, "PostgreSQL database port not specified.  Using default 5432.\n");
        tmp = "5432";
    }
 
    ast_free(pgdbport);
    if (!(pgdbport = ast_strdup(tmp))) {
        ast_config_destroy(cfg);
        ast_mutex_unlock(&pgsql_lock);
        return -1;
    }
 
    if (!(tmp = ast_variable_retrieve(cfg, "global", "table"))) {
        ast_log(LOG_WARNING, "CDR table not specified.  Assuming cdr\n");
        tmp = "cdr";
    }
 
    ast_free(table);
    if (!(table = ast_strdup(tmp))) {
        ast_config_destroy(cfg);
        ast_mutex_unlock(&pgsql_lock);
        return -1;
    }
 
    if (!(tmp = ast_variable_retrieve(cfg, "global", "encoding"))) {
        ast_log(LOG_WARNING, "Encoding not specified.  Assuming LATIN9\n");
        tmp = "LATIN9";
    }
 
    ast_free(encoding);
    if (!(encoding = ast_strdup(tmp))) {
        ast_config_destroy(cfg);
        ast_mutex_unlock(&pgsql_lock);
        return -1;
    }
 
    if (!(tmp = ast_variable_retrieve(cfg, "global", "timezone"))) {
        tmp = "";
    }
 
    ast_free(tz);
    tz = NULL;
 
    if (!ast_strlen_zero(tmp) && !(tz = ast_strdup(tmp))) {
        ast_config_destroy(cfg);
        ast_mutex_unlock(&pgsql_lock);
        return -1;
    }
 
    if (DEBUG_ATLEAST(1)) {
        if (ast_strlen_zero(pghostname)) {
            ast_log(LOG_DEBUG, "using default unix socket\n");
        } else {
            ast_log(LOG_DEBUG, "got hostname of %s\n", pghostname);
        }
        ast_log(LOG_DEBUG, "got port of %s\n", pgdbport);
        ast_log(LOG_DEBUG, "got user of %s\n", pgdbuser);
        ast_log(LOG_DEBUG, "got dbname of %s\n", pgdbname);
        ast_log(LOG_DEBUG, "got password of %s\n", pgpassword);
        ast_log(LOG_DEBUG, "got application name of %s\n", pgappname);
        ast_log(LOG_DEBUG, "got sql table name of %s\n", table);
        ast_log(LOG_DEBUG, "got encoding of %s\n", encoding);
        ast_log(LOG_DEBUG, "got timezone of %s\n", tz);
    }
 
    pgsql_reconnect();
 
    if (PQstatus(conn) != CONNECTION_BAD) {
        char sqlcmd[768];
        char *fname, *ftype, *flen, *fnotnull, *fdef;
        int i, rows, version;
        ast_debug(1, "Successfully connected to PostgreSQL database.\n");
        connected = 1;
        connect_time = time(NULL);
        records = 0;
        if (PQsetClientEncoding(conn, encoding)) {
#ifdef HAVE_PGSQL_pg_encoding_to_char
            ast_log(LOG_WARNING, "Failed to set encoding to '%s'.  Encoding set to default '%s'\n", encoding, pg_encoding_to_char(PQclientEncoding(conn)));
#else
            ast_log(LOG_WARNING, "Failed to set encoding to '%s'.  Encoding set to default.\n", encoding);
#endif
        }
        version = PQserverVersion(conn);
 
        if (version >= PGSQL_MIN_VERSION_SCHEMA) {
            char *schemaname, *tablename, *tmp_schemaname, *tmp_tablename;
            if (strchr(table, '.')) {
                tmp_schemaname = ast_strdupa(table);
                tmp_tablename = strchr(tmp_schemaname, '.');
                *tmp_tablename++ = '\0';
            } else {
                tmp_schemaname = "";
                tmp_tablename = table;
            }
            tablename = ast_alloca(strlen(tmp_tablename) * 2 + 1);
            PQescapeStringConn(conn, tablename, tmp_tablename, strlen(tmp_tablename), NULL);
 
            schemaname = ast_alloca(strlen(tmp_schemaname) * 2 + 1);
            PQescapeStringConn(conn, schemaname, tmp_schemaname, strlen(tmp_schemaname), 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,
                ast_strlen_zero(schemaname) ? "" : "'", ast_strlen_zero(schemaname) ? "current_schema()" : schemaname, ast_strlen_zero(schemaname) ? "" : "'");
        } 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", table);
        }
        /* 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();
            ast_mutex_unlock(&pgsql_lock);
            return AST_MODULE_LOAD_DECLINE;
        }
 
        rows = PQntuples(result);
        if (rows == 0) {
            ast_log(LOG_ERROR, "cdr_pgsql: Failed to query database columns. No columns found, does the table exist?\n");
            PQclear(result);
            unload_module();
            ast_mutex_unlock(&pgsql_lock);
            return AST_MODULE_LOAD_DECLINE;
        }
 
        /* Clear out the columns list. */
        empty_columns();
 
        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);
            if (atoi(flen) == -1) {
                /* For varchar columns, the maximum length is encoded in a different field */
                flen = PQgetvalue(result, i, 5);
            }
 
            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_WRLOCK(&psql_columns);
                AST_RWLIST_INSERT_TAIL(&psql_columns, cur, list);
                AST_RWLIST_UNLOCK(&psql_columns);
            }
        }
        PQclear(result);
    } else {
        pgerror = PQerrorMessage(conn);
        ast_log(LOG_ERROR, "Unable to connect to database server %s.  CALLS WILL NOT BE LOGGED!!\n", pghostname);
        ast_log(LOG_ERROR, "Reason: %s\n", pgerror);
        connected = 0;
        PQfinish(conn);
        conn = NULL;
    }
 
    ast_config_destroy(cfg);
 
    ast_mutex_unlock(&pgsql_lock);
    return 0;
}
static int config_module(int reload) {…}
 
static int load_module(void)
{
    int res;
 
    if (config_module(0)) {
        res = AST_MODULE_LOAD_DECLINE;
    } else if (ast_cdr_register(name, ast_module_info->description, pgsql_log)) {
        res = AST_MODULE_LOAD_DECLINE;
    } else if (ast_cli_register_multiple(cdr_pgsql_status_cli, ARRAY_LEN(cdr_pgsql_status_cli))) {
        res = AST_MODULE_LOAD_DECLINE;
    } else {
        res = AST_MODULE_LOAD_SUCCESS;
    }
 
    if (res != AST_MODULE_LOAD_SUCCESS) {
        unload_module();
    }
 
    return res;
}
static int load_module(void) {…}
 
static int reload(void)
{
    return config_module(1);
}
static int reload(void) {…}
 
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PostgreSQL CDR Backend",
    .support_level = AST_MODULE_SUPPORT_EXTENDED,
    .load = load_module,
    .unload = unload_module,
    .reload = reload,
    .load_pri = AST_MODPRI_CDR_DRIVER,
    .requires = "cdr",
);