Mon Mar 31 07:37:57 2008

Asterisk developer's documentation


cdr_pgsql.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 2003 - 2006
00005  *
00006  * Matthew D. Hardeman <mhardemn@papersoft.com> 
00007  * Adapted from the MySQL CDR logger originally by James Sharp 
00008  *
00009  * Modified September 2003
00010  * Matthew D. Hardeman <mhardemn@papersoft.com>
00011  *
00012  * See http://www.asterisk.org for more information about
00013  * the Asterisk project. Please do not directly contact
00014  * any of the maintainers of this project for assistance;
00015  * the project provides a web site, mailing lists and IRC
00016  * channels for your use.
00017  *
00018  * This program is free software, distributed under the terms of
00019  * the GNU General Public License Version 2. See the LICENSE file
00020  * at the top of the source tree.
00021  */
00022 
00023 /*! \file
00024  *
00025  * \brief PostgreSQL CDR logger 
00026  * 
00027  * \author Matthew D. Hardeman <mhardemn@papersoft.com> 
00028  *
00029  * See also
00030  * \arg \ref Config_cdr
00031  * \arg http://www.postgresql.org/
00032  * \ingroup cdr_drivers
00033  */
00034 
00035 /*** MODULEINFO
00036    <depend>pgsql</depend>
00037  ***/
00038 
00039 #include "asterisk.h"
00040 
00041 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
00042 
00043 #include <sys/types.h>
00044 #include <stdio.h>
00045 #include <string.h>
00046 #include <stdlib.h>
00047 #include <unistd.h>
00048 #include <time.h>
00049 
00050 #include <libpq-fe.h>
00051 
00052 #include "asterisk/config.h"
00053 #include "asterisk/options.h"
00054 #include "asterisk/channel.h"
00055 #include "asterisk/cdr.h"
00056 #include "asterisk/module.h"
00057 #include "asterisk/logger.h"
00058 #include "asterisk.h"
00059 
00060 #define DATE_FORMAT "%Y-%m-%d %T"
00061 
00062 static char *name = "pgsql";
00063 static char *config = "cdr_pgsql.conf";
00064 static char *pghostname = NULL, *pgdbname = NULL, *pgdbuser = NULL, *pgpassword = NULL, *pgdbport = NULL, *table = NULL;
00065 static int connected = 0;
00066 
00067 AST_MUTEX_DEFINE_STATIC(pgsql_lock);
00068 
00069 static PGconn  *conn = NULL;
00070 
00071 static int pgsql_log(struct ast_cdr *cdr)
00072 {
00073    struct tm tm;
00074    time_t t = cdr->start.tv_sec;
00075    static char sqlcmd[4096] = "", timestr[128];
00076    char *pgerror;
00077    PGresult *result;
00078 
00079    ast_mutex_lock(&pgsql_lock);
00080 
00081    ast_localtime(&t, &tm, NULL);
00082    strftime(timestr, sizeof(timestr), DATE_FORMAT, &tm);
00083 
00084    if ((!connected) && pghostname && pgdbuser && pgpassword && pgdbname) {
00085       conn = PQsetdbLogin(pghostname, pgdbport, NULL, NULL, pgdbname, pgdbuser, pgpassword);
00086       if (PQstatus(conn) != CONNECTION_BAD) {
00087          connected = 1;
00088       } else {
00089          pgerror = PQerrorMessage(conn);
00090          ast_log(LOG_ERROR, "cdr_pgsql: Unable to connect to database server %s.  Calls will not be logged!\n", pghostname);
00091          ast_log(LOG_ERROR, "cdr_pgsql: Reason: %s\n", pgerror);
00092          PQfinish(conn);
00093          conn = NULL;
00094       }
00095    }
00096 
00097    if (connected) {
00098       char *clid=NULL, *dcontext=NULL, *channel=NULL, *dstchannel=NULL, *lastapp=NULL, *lastdata=NULL;
00099       char *src=NULL, *dst=NULL, *uniqueid=NULL, *userfield=NULL;
00100       int pgerr;
00101 
00102       /* Maximum space needed would be if all characters needed to be escaped, plus a trailing NULL */
00103       if ((clid = alloca(strlen(cdr->clid) * 2 + 1)) != NULL)
00104          PQescapeStringConn(conn, clid, cdr->clid, strlen(cdr->clid), &pgerr);
00105       if ((dcontext = alloca(strlen(cdr->dcontext) * 2 + 1)) != NULL)
00106          PQescapeStringConn(conn, dcontext, cdr->dcontext, strlen(cdr->dcontext), &pgerr);
00107       if ((channel = alloca(strlen(cdr->channel) * 2 + 1)) != NULL)
00108          PQescapeStringConn(conn, channel, cdr->channel, strlen(cdr->channel), &pgerr);
00109       if ((dstchannel = alloca(strlen(cdr->dstchannel) * 2 + 1)) != NULL)
00110          PQescapeStringConn(conn, dstchannel, cdr->dstchannel, strlen(cdr->dstchannel), &pgerr);
00111       if ((lastapp = alloca(strlen(cdr->lastapp) * 2 + 1)) != NULL)
00112          PQescapeStringConn(conn, lastapp, cdr->lastapp, strlen(cdr->lastapp), &pgerr);
00113       if ((lastdata = alloca(strlen(cdr->lastdata) * 2 + 1)) != NULL)
00114          PQescapeStringConn(conn, lastdata, cdr->lastdata, strlen(cdr->lastdata), &pgerr);
00115       if ((uniqueid = alloca(strlen(cdr->uniqueid) * 2 + 1)) != NULL)
00116          PQescapeStringConn(conn, uniqueid, cdr->uniqueid, strlen(cdr->uniqueid), &pgerr);
00117       if ((userfield = alloca(strlen(cdr->userfield) * 2 + 1)) != NULL)
00118          PQescapeStringConn(conn, userfield, cdr->userfield, strlen(cdr->userfield), &pgerr);
00119       if ((src = alloca(strlen(cdr->src) * 2 + 1)) != NULL)
00120          PQescapeStringConn(conn, src, cdr->src, strlen(cdr->src), &pgerr);
00121       if ((dst = alloca(strlen(cdr->dst) * 2 + 1)) != NULL)
00122          PQescapeStringConn(conn, dst, cdr->dst, strlen(cdr->dst), &pgerr);
00123 
00124       /* Check for all alloca failures above at once */
00125       if ((!clid) || (!dcontext) || (!channel) || (!dstchannel) || (!lastapp) || (!lastdata) || (!uniqueid) || (!userfield) || (!src) || (!dst)) {
00126          ast_log(LOG_ERROR, "cdr_pgsql:  Out of memory error (insert fails)\n");
00127          ast_mutex_unlock(&pgsql_lock);
00128          return -1;
00129       }
00130 
00131       if (option_debug > 1)
00132          ast_log(LOG_DEBUG, "cdr_pgsql: inserting a CDR record.\n");
00133 
00134       /* XXX: need to check string length, and, may be, realloc buffer */
00135       snprintf(sqlcmd,sizeof(sqlcmd),"INSERT INTO %s (calldate,clid,src,dst,dcontext,channel,dstchannel,"
00136              "lastapp,lastdata,duration,billsec,disposition,amaflags,accountcode,uniqueid,userfield) VALUES"
00137              " ('%s','%s','%s','%s','%s', '%s','%s','%s','%s',%ld,%ld,'%s',%ld,'%s','%s','%s')",
00138              table, timestr, clid, src, dst, dcontext, channel, dstchannel, lastapp, lastdata,
00139              cdr->duration,cdr->billsec,ast_cdr_disp2str(cdr->disposition),cdr->amaflags, cdr->accountcode, uniqueid, userfield);
00140       
00141       if (option_debug > 2)
00142          ast_log(LOG_DEBUG, "cdr_pgsql: SQL command executed:  %s\n",sqlcmd);
00143       
00144       /* Test to be sure we're still connected... */
00145       /* If we're connected, and connection is working, good. */
00146       /* Otherwise, attempt reconnect.  If it fails... sorry... */
00147       if (PQstatus(conn) == CONNECTION_OK) {
00148          connected = 1;
00149       } else {
00150          ast_log(LOG_ERROR, "cdr_pgsql: Connection was lost... attempting to reconnect.\n");
00151          PQreset(conn);
00152          if (PQstatus(conn) == CONNECTION_OK) {
00153             ast_log(LOG_ERROR, "cdr_pgsql: Connection reestablished.\n");
00154             connected = 1;
00155          } else {
00156             pgerror = PQerrorMessage(conn);
00157             ast_log(LOG_ERROR, "cdr_pgsql: Unable to reconnect to database server %s. Calls will not be logged!\n", pghostname);
00158             ast_log(LOG_ERROR, "cdr_pgsql: Reason: %s\n", pgerror);
00159             PQfinish(conn);
00160             conn = NULL;
00161             connected = 0;
00162             ast_mutex_unlock(&pgsql_lock);
00163             return -1;
00164          }
00165       }
00166       result = PQexec(conn, sqlcmd);
00167       if (PQresultStatus(result) != PGRES_COMMAND_OK) {
00168          pgerror = PQresultErrorMessage(result);
00169          ast_log(LOG_ERROR,"cdr_pgsql: Failed to insert call detail record into database!\n");
00170          ast_log(LOG_ERROR,"cdr_pgsql: Reason: %s\n", pgerror);
00171          ast_log(LOG_ERROR,"cdr_pgsql: Connection may have been lost... attempting to reconnect.\n");
00172          PQreset(conn);
00173          if (PQstatus(conn) == CONNECTION_OK) {
00174             ast_log(LOG_ERROR, "cdr_pgsql: Connection reestablished.\n");
00175             connected = 1;
00176             PQclear(result);
00177             result = PQexec(conn, sqlcmd);
00178             if (PQresultStatus(result) != PGRES_COMMAND_OK) {
00179                pgerror = PQresultErrorMessage(result);
00180                ast_log(LOG_ERROR,"cdr_pgsql: HARD ERROR!  Attempted reconnection failed.  DROPPING CALL RECORD!\n");
00181                ast_log(LOG_ERROR,"cdr_pgsql: Reason: %s\n", pgerror);
00182             }
00183          }
00184          ast_mutex_unlock(&pgsql_lock);
00185          PQclear(result);
00186          return -1;
00187       }
00188       PQclear(result);
00189    }
00190    ast_mutex_unlock(&pgsql_lock);
00191    return 0;
00192 }
00193 
00194 static int my_unload_module(void)
00195 { 
00196    PQfinish(conn);
00197    if (pghostname)
00198       free(pghostname);
00199    if (pgdbname)
00200       free(pgdbname);
00201    if (pgdbuser)
00202       free(pgdbuser);
00203    if (pgpassword)
00204       free(pgpassword);
00205    if (pgdbport)
00206       free(pgdbport);
00207    if (table)
00208       free(table);
00209    ast_cdr_unregister(name);
00210    return 0;
00211 }
00212 
00213 static int process_my_load_module(struct ast_config *cfg)
00214 {
00215    struct ast_variable *var;
00216         char *pgerror;
00217    const char *tmp;
00218 
00219    if (!(var = ast_variable_browse(cfg, "global")))
00220       return 0;
00221 
00222    if (!(tmp = ast_variable_retrieve(cfg,"global","hostname"))) {
00223       ast_log(LOG_WARNING,"PostgreSQL server hostname not specified.  Assuming unix socket connection\n");
00224       tmp = "";   /* connect via UNIX-socket by default */
00225    }
00226    
00227    if (!(pghostname = ast_strdup(tmp)))
00228       return -1;
00229 
00230    if (!(tmp = ast_variable_retrieve(cfg, "global", "dbname"))) {
00231       ast_log(LOG_WARNING,"PostgreSQL database not specified.  Assuming asterisk\n");
00232       tmp = "asterisk";
00233    }
00234 
00235    if (!(pgdbname = ast_strdup(tmp)))
00236       return -1;
00237 
00238    if (!(tmp = ast_variable_retrieve(cfg, "global", "user"))) {
00239       ast_log(LOG_WARNING,"PostgreSQL database user not specified.  Assuming asterisk\n");
00240       tmp = "asterisk";
00241    }
00242 
00243    if (!(pgdbuser = ast_strdup(tmp)))
00244       return -1;
00245 
00246    if (!(tmp = ast_variable_retrieve(cfg, "global", "password"))) {
00247       ast_log(LOG_WARNING,"PostgreSQL database password not specified.  Assuming blank\n");
00248       tmp = "";
00249    }
00250 
00251    if (!(pgpassword = ast_strdup(tmp)))
00252       return -1;
00253 
00254    if (!(tmp = ast_variable_retrieve(cfg,"global","port"))) {
00255       ast_log(LOG_WARNING,"PostgreSQL database port not specified.  Using default 5432.\n");
00256       tmp = "5432";
00257    }
00258 
00259    if (!(pgdbport = ast_strdup(tmp)))
00260       return -1;
00261 
00262    if (!(tmp = ast_variable_retrieve(cfg, "global", "table"))) {
00263       ast_log(LOG_WARNING,"CDR table not specified.  Assuming cdr\n");
00264       tmp = "cdr";
00265    }
00266 
00267    if (!(table = ast_strdup(tmp)))
00268       return -1;
00269 
00270    if (option_debug) {
00271          if (ast_strlen_zero(pghostname))
00272          ast_log(LOG_DEBUG, "cdr_pgsql: using default unix socket\n");
00273       else
00274          ast_log(LOG_DEBUG, "cdr_pgsql: got hostname of %s\n", pghostname);
00275       ast_log(LOG_DEBUG, "cdr_pgsql: got port of %s\n", pgdbport);
00276       ast_log(LOG_DEBUG, "cdr_pgsql: got user of %s\n", pgdbuser);
00277       ast_log(LOG_DEBUG, "cdr_pgsql: got dbname of %s\n", pgdbname);
00278       ast_log(LOG_DEBUG, "cdr_pgsql: got password of %s\n", pgpassword);
00279       ast_log(LOG_DEBUG, "cdr_pgsql: got sql table name of %s\n", table);
00280    }
00281    
00282    conn = PQsetdbLogin(pghostname, pgdbport, NULL, NULL, pgdbname, pgdbuser, pgpassword);
00283    if (PQstatus(conn) != CONNECTION_BAD) {
00284       if (option_debug)
00285          ast_log(LOG_DEBUG, "Successfully connected to PostgreSQL database.\n");
00286       connected = 1;
00287    } else {
00288                 pgerror = PQerrorMessage(conn);
00289       ast_log(LOG_ERROR, "cdr_pgsql: Unable to connect to database server %s.  CALLS WILL NOT BE LOGGED!!\n", pghostname);
00290                 ast_log(LOG_ERROR, "cdr_pgsql: Reason: %s\n", pgerror);
00291       connected = 0;
00292    }
00293 
00294    return ast_cdr_register(name, ast_module_info->description, pgsql_log);
00295 }
00296 
00297 static int my_load_module(void)
00298 {
00299    struct ast_config *cfg;
00300    int res;
00301 
00302    if (!(cfg = ast_config_load(config))) {
00303       ast_log(LOG_WARNING, "Unable to load config for PostgreSQL CDR's: %s\n", config);
00304       return AST_MODULE_LOAD_DECLINE;
00305    }
00306 
00307    res = process_my_load_module(cfg);
00308    ast_config_destroy(cfg);
00309 
00310    return res;
00311 }
00312 
00313 static int load_module(void)
00314 {
00315    return my_load_module();
00316 }
00317 
00318 static int unload_module(void)
00319 {
00320    return my_unload_module();
00321 }
00322 
00323 static int reload(void)
00324 {
00325    int res;
00326    ast_mutex_lock(&pgsql_lock);
00327    my_unload_module();
00328    res = my_load_module();
00329    ast_mutex_unlock(&pgsql_lock);
00330    return res;
00331 }
00332 
00333 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "PostgreSQL CDR Backend",
00334       .load = load_module,
00335       .unload = unload_module,
00336       .reload = reload,
00337           );

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