asterisk/res/res_config_pgsql.c

/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * Copyright (C) 1999-2005, Digium, Inc.
 * 
 * Manuel Guesdon <mguesdon@oxymium.net> - Postgresql RealTime Driver Author/Adaptor
 * Mark Spencer <markster@digium.com>  - Asterisk Author
 * Matthew Boehm <mboehm@cytelcom.com> - MySQL RealTime Driver Author
 *
 * res_config_pgsql.c <Postgresql plugin for RealTime configuration engine>
 *
 * v1.0   - (07-11-05) - Initial version based on res_config_mysql v2.0
 */

/*! \file
 *
 * \brief Postgresql plugin for Asterisk RealTime Architecture
 *
 * \author Mark Spencer <markster@digium.com>
 * \author Manuel Guesdon <mguesdon@oxymium.net> - Postgresql RealTime Driver Author/Adaptor
 *
 * \arg http://www.postgresql.org
 */

#include <stdlib.h>
#include <string.h>
#include <libpq-fe.h>	/* PostgreSQL */

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/lock.h"
#include "asterisk/options.h"
#include "asterisk/utils.h"
#include "asterisk/cli.h"

static char *res_config_pgsql_desc = "Postgresql RealTime Configuration Driver";

AST_MUTEX_DEFINE_STATIC(pgsql_lock);
#define RES_CONFIG_PGSQL_CONF "res_pgsql.conf"
PGconn*         pgsqlConn = NULL;
static char   dbhost[50]="";
static char   dbuser[50]="";
static char   dbpass[50]="";
static char   dbname[50]="";
static char   dbsock[50]="";
static int    dbport=5432;
static time_t connect_time=0;

static int parse_config(void);
static int pgsql_reconnect(const char *database);
static int realtime_pgsql_status(int fd, int argc, char **argv);

LOCAL_USER_DECL;

static char cli_realtime_pgsql_status_usage[] =
"Usage: realtime pgsql status\n"
"       Shows connection information for the Postgresql RealTime driver\n";

static struct ast_cli_entry cli_realtime_pgsql_status = {
        { "realtime", "pgsql", "status", NULL }, realtime_pgsql_status,
        "Shows connection information for the Postgresql RealTime driver", cli_realtime_pgsql_status_usage, NULL };

static struct ast_variable *realtime_pgsql(const char *database, const char *table, va_list ap)
{
	PGresult *result = NULL;
	int num_rows = 0;
	char sql[256];
	char *stringp;
	char *chunk;
	char *op;
	const char *newparam, *newval;
	struct ast_variable *var=NULL, *prev=NULL;

	if(!table) {
		ast_log(LOG_WARNING, "Postgresql RealTime: No table specified.\n");
		return NULL;
	}

	/* Get the first parameter and first value in our list of passed paramater/value pairs */
	newparam = va_arg(ap, const char *);
	newval = va_arg(ap, const char *);
	if(!newparam || !newval)  {
		ast_log(LOG_WARNING, "Postgresql RealTime: Realtime retrieval requires at least 1 parameter and 1 value to search on.\n");
		if (pgsqlConn)
		  {
		    PQfinish(pgsqlConn);
		    pgsqlConn=NULL;
		  };
		return NULL;
	}

	/* Create the first part of the query using the first parameter/value pairs we just extracted
	   If there is only 1 set, then we have our query. Otherwise, loop thru the list and concat */

	if(!strchr(newparam, ' ')) op = " ="; else op = "";

	snprintf(sql, sizeof(sql), "SELECT * FROM %s WHERE %s%s '%s'", table, newparam, op, newval);
	while((newparam = va_arg(ap, const char *))) {
		newval = va_arg(ap, const char *);
		if(!strchr(newparam, ' ')) op = " ="; else op = "";
		snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), " AND %s%s '%s'", newparam, op, newval);
	}
	va_end(ap);

	/* We now have our complete statement; Lets connect to the server and execute it. */
	ast_mutex_lock(&pgsql_lock);
	if(!pgsql_reconnect(database)) {
		ast_mutex_unlock(&pgsql_lock);
		return NULL;
	}
	
	if(!(result=PQexec(pgsqlConn, sql))) {
		ast_log(LOG_WARNING, "Postgresql RealTime: Failed to query database. Check debug for more info.\n");
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query: %s\n", sql);
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query Failed because: %s\n", PQerrorMessage(pgsqlConn));
		ast_mutex_unlock(&pgsql_lock);
		return NULL;
	}
	else {
	  ExecStatusType result_status=PQresultStatus(result);
	  if (result_status!=PGRES_COMMAND_OK
	      && result_status!=PGRES_TUPLES_OK
	      && result_status!=PGRES_NONFATAL_ERROR)
	    {
		ast_log(LOG_WARNING, "Postgresql RealTime: Failed to query database. Check debug for more info.\n");
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query: %s\n", sql);
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query Failed because: %s (%s)\n", 
			PQresultErrorMessage(result),PQresStatus(result_status));
		ast_mutex_unlock(&pgsql_lock);
		return NULL;
	    }
	}
	   
	ast_log(LOG_DEBUG, "1Postgresql RealTime: Result=%p Query: %s\n", result, sql);

	if((num_rows=PQntuples(result))>0) {
	  int i = 0;
	  int rowIndex=0;
	  int numFields = PQnfields(result);
	  char** fieldnames=NULL;

	  ast_log(LOG_DEBUG, "Postgresql RealTime: Found %d rows.\n", num_rows);

	  fieldnames=malloc(numFields*sizeof(char*));
	  if (!fieldnames) {
	    /* If I can't alloc memory at this point, why bother doing anything else? */
	    ast_log(LOG_WARNING, "Out of memory!\n");
	    ast_mutex_unlock(&pgsql_lock);
	    PQclear(result);
	    return NULL;
	  }
	  for(i = 0; i < numFields; i++)
	    fieldnames[i]=PQfname(result,i);
	  for(rowIndex=0;rowIndex<num_rows;rowIndex++)
	    {
	      for(i = 0; i < numFields; i++) {
		stringp = PQgetvalue(result,rowIndex,i);
		while(stringp) {
		  chunk = strsep(&stringp, ";");
		  if(chunk && !ast_strlen_zero(ast_strip(chunk))) {
		    if(prev) {
		      prev->next = ast_variable_new(fieldnames[i], chunk);
		      if (prev->next) {
			prev = prev->next;
		      }
		    } else {
		      prev = var = ast_variable_new(fieldnames[i], chunk);
		    }
		  }
		}
	      }
	    }
	  free(fieldnames);
	} else {                                
		ast_log(LOG_WARNING, "Postgresql RealTime: Could not find any rows in table %s.\n", table);
	}

	ast_mutex_unlock(&pgsql_lock);
	PQclear(result);

	return var;
}

static struct ast_config *realtime_multi_pgsql(const char *database, const char *table, va_list ap)
{
	PGresult *result = NULL;
	int num_rows = 0;
	char sql[256];
	const char *initfield = NULL;
	char *stringp;
	char *chunk;
	char *op;
	const char *newparam, *newval;
	struct ast_realloca ra;
	struct ast_variable *var=NULL;
	struct ast_config *cfg = NULL;
	struct ast_category *cat = NULL;

	if(!table) {
		ast_log(LOG_WARNING, "Postgresql RealTime: No table specified.\n");
		return NULL;
	}
	
	memset(&ra, 0, sizeof(ra));

	cfg = ast_config_new();
	if (!cfg) {
		/* If I can't alloc memory at this point, why bother doing anything else? */
		ast_log(LOG_WARNING, "Out of memory!\n");
		return NULL;
	}

	/* Get the first parameter and first value in our list of passed paramater/value pairs */
	newparam = va_arg(ap, const char *);
	newval = va_arg(ap, const char *);
	if(!newparam || !newval)  {
		ast_log(LOG_WARNING, "Postgresql RealTime: Realtime retrieval requires at least 1 parameter and 1 value to search on.\n");
		if (pgsqlConn)
		  {
		    PQfinish(pgsqlConn);
		    pgsqlConn=NULL;
		  };
		return NULL;
	}

	initfield = ast_strdupa(newparam);
	if(initfield && (op = strchr(initfield, ' '))) {
		*op = '\0';
	}

	/* Create the first part of the query using the first parameter/value pairs we just extracted
	   If there is only 1 set, then we have our query. Otherwise, loop thru the list and concat */

	if(!strchr(newparam, ' ')) op = " ="; else op = "";

	snprintf(sql, sizeof(sql), "SELECT * FROM %s WHERE %s%s '%s'", table, newparam, op, newval);
	while((newparam = va_arg(ap, const char *))) {
		newval = va_arg(ap, const char *);
		if(!strchr(newparam, ' ')) op = " ="; else op = "";
		snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), " AND %s%s '%s'", newparam, op, newval);
	}

	if(initfield) {
		snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), " ORDER BY %s", initfield);
	}

	va_end(ap);

	/* We now have our complete statement; Lets connect to the server and execute it. */
	ast_mutex_lock(&pgsql_lock);
	if(!pgsql_reconnect(database)) {
		ast_mutex_unlock(&pgsql_lock);
		return NULL;
	}

	if(!(result=PQexec(pgsqlConn, sql))) {
		ast_log(LOG_WARNING, "Postgresql RealTime: Failed to query database. Check debug for more info.\n");
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query: %s\n", sql);
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query Failed because: %s\n", PQerrorMessage(pgsqlConn));
		ast_mutex_unlock(&pgsql_lock);
		return NULL;
	}
	else {
	  ExecStatusType result_status=PQresultStatus(result);
	  if (result_status!=PGRES_COMMAND_OK
	      && result_status!=PGRES_TUPLES_OK
	      && result_status!=PGRES_NONFATAL_ERROR)
	    {
		ast_log(LOG_WARNING, "Postgresql RealTime: Failed to query database. Check debug for more info.\n");
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query: %s\n", sql);
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query Failed because: %s (%s)\n", 
			PQresultErrorMessage(result),PQresStatus(result_status));
		ast_mutex_unlock(&pgsql_lock);
		return NULL;
	    }
	}

	ast_log(LOG_DEBUG, "2Postgresql RealTime: Result=%p Query: %s\n", result, sql);

	if((num_rows=PQntuples(result))>0) {
	  int numFields = PQnfields(result);
	  int i = 0;
	  int rowIndex=0;
	  char** fieldnames=NULL;

	  ast_log(LOG_DEBUG, "Postgresql RealTime: Found %d rows.\n", num_rows);
	  
	  fieldnames=malloc(numFields*sizeof(char*));
	  if (!fieldnames) {
	    /* If I can't alloc memory at this point, why bother doing anything else? */
	    ast_log(LOG_WARNING, "Out of memory!\n");
	    ast_mutex_unlock(&pgsql_lock);
	    PQclear(result);
	    return NULL;
	  }
	  for(i = 0; i < numFields; i++)
	    fieldnames[i]=PQfname(result,i);

	  for(rowIndex=0;rowIndex<num_rows;rowIndex++)
	    {
	      var = NULL;
	      cat = ast_category_new("");
	      if(!cat) {
		ast_log(LOG_WARNING, "Out of memory!\n");
		continue;
	      }
	      for(i = 0; i < numFields; i++) {
		stringp = PQgetvalue(result,rowIndex,i);
		while(stringp) {
		  chunk = strsep(&stringp, ";");
		  if(chunk && !ast_strlen_zero(ast_strip(chunk))) {
		    if(initfield && !strcmp(initfield, fieldnames[i])) {
		      ast_category_rename(cat, chunk);
		    }
		    var = ast_variable_new(fieldnames[i], chunk);
		    ast_variable_append(cat, var);
		  }
		}
	      }
	      ast_category_append(cfg, cat);
	    }
	  free(fieldnames);
	} else {
		ast_log(LOG_WARNING, "Postgresql RealTime: Could not find any rows in table %s.\n", table);
	}

	ast_mutex_unlock(&pgsql_lock);
	PQclear(result);

	return cfg;
}

static int update_pgsql(const char *database, const char *table, const char *keyfield, const char *lookup, va_list ap)
{
        PGresult* result = NULL;
	int numrows = 0;
	char sql[256];
	const char *newparam, *newval;

	if(!table) {
		ast_log(LOG_WARNING, "Postgresql RealTime: No table specified.\n");
               return -1;
	}

	/* Get the first parameter and first value in our list of passed paramater/value pairs */
	newparam = va_arg(ap, const char *);
	newval = va_arg(ap, const char *);
	if(!newparam || !newval)  {
		ast_log(LOG_WARNING, "Postgresql RealTime: Realtime retrieval requires at least 1 parameter and 1 value to search on.\n");
		if (pgsqlConn)
		  {
		    PQfinish(pgsqlConn);
		    pgsqlConn=NULL;
		  };
               return -1;
	}

	/* Create the first part of the query using the first parameter/value pairs we just extracted
	   If there is only 1 set, then we have our query. Otherwise, loop thru the list and concat */

	snprintf(sql, sizeof(sql), "UPDATE %s SET %s = '%s'", table, newparam, newval);
	while((newparam = va_arg(ap, const char *))) {
		newval = va_arg(ap, const char *);
		snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), ", %s = '%s'", newparam, newval);
	}
	va_end(ap);
	snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), " WHERE %s = '%s'", keyfield, lookup);

	ast_log(LOG_DEBUG,"Postgresql RealTime: Update SQL: %s\n", sql);

	/* We now have our complete statement; Lets connect to the server and execute it. */
	ast_mutex_lock(&pgsql_lock);
	if(!pgsql_reconnect(database)) {
		ast_mutex_unlock(&pgsql_lock);
		return -1;
	}

	if(!(result=PQexec(pgsqlConn, sql))) {
		ast_log(LOG_WARNING, "Postgresql RealTime: Failed to query database. Check debug for more info.\n");
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query: %s\n", sql);
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query Failed because: %s\n", PQerrorMessage(pgsqlConn));
		ast_mutex_unlock(&pgsql_lock);
		return -1;
	}
	else {
	  ExecStatusType result_status=PQresultStatus(result);
	  if (result_status!=PGRES_COMMAND_OK
	      && result_status!=PGRES_TUPLES_OK
	      && result_status!=PGRES_NONFATAL_ERROR)
	    {
		ast_log(LOG_WARNING, "Postgresql RealTime: Failed to query database. Check debug for more info.\n");
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query: %s\n", sql);
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query Failed because: %s (%s)\n", 
			PQresultErrorMessage(result),PQresStatus(result_status));
		ast_mutex_unlock(&pgsql_lock);
		return -1;
	    }
	}

	numrows = atoi(PQcmdTuples(result));
	ast_mutex_unlock(&pgsql_lock);

	ast_log(LOG_DEBUG,"Postgresql RealTime: Updated %d rows on table: %s\n", numrows, table);

	/* From http://dev.pgsql.com/doc/pgsql/en/pgsql-affected-rows.html
	 * An integer greater than zero indicates the number of rows affected
	 * Zero indicates that no records were updated
	 * -1 indicates that the query returned an error (although, if the query failed, it should have been caught above.)
	*/

	if(numrows >= 0)
		return (int)numrows;

	return -1;
}

static struct ast_config *config_pgsql(const char *database, const char *table, const char *file, struct ast_config *cfg)
{
	PGresult *result = NULL;
	long num_rows;
	struct ast_variable *new_v;
	struct ast_category *cur_cat = NULL;
	char sql[250] = "";
	char last[80] = "";
	int last_cat_metric = 0;

	last[0] = '\0';

	if(!file || !strcmp(file, RES_CONFIG_PGSQL_CONF)) {
		ast_log(LOG_WARNING, "Postgresql RealTime: Cannot configure myself.\n");
		return NULL;
	}

	snprintf(sql, sizeof(sql), "SELECT category, var_name, var_val, cat_metric FROM %s WHERE filename='%s' and commented=0 ORDER BY filename, cat_metric desc, var_metric asc, category, var_name, var_val, id", table, file);

	ast_log(LOG_DEBUG, "Postgresql RealTime: Static SQL: %s\n", sql);

	/* We now have our complete statement; Lets connect to the server and execute it. */
	ast_mutex_lock(&pgsql_lock);
	if(!pgsql_reconnect(database)) {
		ast_mutex_unlock(&pgsql_lock);
		return NULL;
	}

	if(!(result=PQexec(pgsqlConn, sql))) {
		ast_log(LOG_WARNING, "Postgresql RealTime: Failed to query database. Check debug for more info.\n");
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query: %s\n", sql);
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query Failed because: %s\n", PQerrorMessage(pgsqlConn));
		ast_mutex_unlock(&pgsql_lock);
		return NULL;
	}
	else {
	  ExecStatusType result_status=PQresultStatus(result);
	  if (result_status!=PGRES_COMMAND_OK
	      && result_status!=PGRES_TUPLES_OK
	      && result_status!=PGRES_NONFATAL_ERROR)
	    {
		ast_log(LOG_WARNING, "Postgresql RealTime: Failed to query database. Check debug for more info.\n");
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query: %s\n", sql);
		ast_log(LOG_DEBUG, "Postgresql RealTime: Query Failed because: %s (%s)\n", 
			PQresultErrorMessage(result),PQresStatus(result_status));
		ast_mutex_unlock(&pgsql_lock);
		return NULL;
	    }
	}

	if((num_rows=PQntuples(result))>0) {
	  int numFields = PQnfields(result);
	  int i = 0;
	  int rowIndex=0;
	  char** fieldnames=NULL;

	  ast_log(LOG_DEBUG, "Postgresql RealTime: Found %ld rows.\n", num_rows);
	  
	  fieldnames=malloc(numFields*sizeof(char*));
	  if (!fieldnames) {
	    /* If I can't alloc memory at this point, why bother doing anything else? */
	    ast_log(LOG_WARNING, "Out of memory!\n");
	    ast_mutex_unlock(&pgsql_lock);
	    PQclear(result);
	    return NULL;
	  }
	  for(i = 0; i < numFields; i++)
	    fieldnames[i]=PQfname(result,i);

	  for(rowIndex=0;rowIndex<num_rows;rowIndex++)
	    {
	      char* field_category=PQgetvalue(result,rowIndex,0);
	      char* field_var_name=PQgetvalue(result,rowIndex,1);
	      char* field_var_val=PQgetvalue(result,rowIndex,2);
	      char* field_cat_metric=PQgetvalue(result,rowIndex,3);
			if(!strcmp(field_var_name, "#include")) {
				if (!ast_config_internal_load(field_var_val, cfg)) {
					PQclear(result);
					ast_mutex_unlock(&pgsql_lock);
					return NULL;
				}
				continue;
			}

			if(strcmp(last, field_category) || last_cat_metric != atoi(field_cat_metric)) {
				cur_cat = ast_category_new(field_category);
				if (!cur_cat) {
					ast_log(LOG_WARNING, "Out of memory!\n");
					break;
				}
				strcpy(last, field_category);
				last_cat_metric = atoi(field_cat_metric);
				ast_category_append(cfg, cur_cat);
			}
			new_v = ast_variable_new(field_var_name, field_var_val);
			ast_variable_append(cur_cat, new_v);
		}
	} else {
		ast_log(LOG_WARNING, "Postgresql RealTime: Could not find config '%s' in database.\n", file);
	}

	PQclear(result);
	ast_mutex_unlock(&pgsql_lock);

	return cfg;
}

static struct ast_config_engine pgsql_engine = {
	.name = "pgsql",
	.load_func = config_pgsql,
	.realtime_func = realtime_pgsql,
	.realtime_multi_func = realtime_multi_pgsql,
	.update_func = update_pgsql
};

int load_module (void)
{
	parse_config();

	ast_mutex_lock(&pgsql_lock);

	if(!pgsql_reconnect(NULL)) {
		ast_log(LOG_WARNING, "Postgresql RealTime: Couldn't establish connection. Check debug.\n");
		ast_log(LOG_DEBUG, "Postgresql RealTime: Cannot Connect: %s\n", PQerrorMessage(pgsqlConn));
	}

	ast_config_engine_register(&pgsql_engine);
	if(option_verbose) {
		ast_verbose("Postgresql RealTime driver loaded.\n");
	}
	ast_cli_register(&cli_realtime_pgsql_status);

	ast_mutex_unlock(&pgsql_lock);

	return 0;
}

int unload_module (void)
{
	/* Aquire control before doing anything to the module itself. */
	ast_mutex_lock(&pgsql_lock);

	if (pgsqlConn)
	  {
	    PQfinish(pgsqlConn);
	    pgsqlConn=NULL;
	  };
	ast_cli_unregister(&cli_realtime_pgsql_status);
	ast_config_engine_deregister(&pgsql_engine);
	if(option_verbose) {
		ast_verbose("Postgresql RealTime unloaded.\n");
	}

	STANDARD_HANGUP_LOCALUSERS;

	/* Unlock so something else can destroy the lock. */
	ast_mutex_unlock(&pgsql_lock);

	return 0;
}

int reload (void)
{
	/* Aquire control before doing anything to the module itself. */
	ast_mutex_lock(&pgsql_lock);

	if (pgsqlConn)
	  {
	    PQfinish(pgsqlConn);
	    pgsqlConn=NULL;
	  };
	parse_config();

	if(!pgsql_reconnect(NULL)) {
		ast_log(LOG_WARNING, "Postgresql RealTime: Couldn't establish connection. Check debug.\n");
		ast_log(LOG_DEBUG, "Postgresql RealTime: Cannot Connect: %s\n", PQerrorMessage(pgsqlConn));
	}

	ast_verbose(VERBOSE_PREFIX_2 "Postgresql RealTime reloaded.\n");

	/* Done reloading. Release lock so others can now use driver. */
	ast_mutex_unlock(&pgsql_lock);

	return 0;
}

int parse_config (void)
{
	struct ast_config *config;
	char *s;

	config = ast_config_load(RES_CONFIG_PGSQL_CONF);

	if(config) {
		if(!(s=ast_variable_retrieve(config, "general", "dbuser"))) {
			ast_log(LOG_WARNING, "Postgresql RealTime: No database user found, using 'asterisk' as default.\n");
			strncpy(dbuser, "asterisk", sizeof(dbuser) - 1);
		} else {
			strncpy(dbuser, s, sizeof(dbuser) - 1);
		}

		if(!(s=ast_variable_retrieve(config, "general", "dbpass"))) {
                        ast_log(LOG_WARNING, "Postgresql RealTime: No database password found, using 'asterisk' as default.\n");
                        strncpy(dbpass, "asterisk", sizeof(dbpass) - 1);
                } else {
                        strncpy(dbpass, s, sizeof(dbpass) - 1);
                }

		if(!(s=ast_variable_retrieve(config, "general", "dbhost"))) {
                        ast_log(LOG_WARNING, "Postgresql RealTime: No database host found, using localhost via socket.\n");
			dbhost[0] = '\0';
                } else {
                        strncpy(dbhost, s, sizeof(dbhost) - 1);
                }

		if(!(s=ast_variable_retrieve(config, "general", "dbname"))) {
                        ast_log(LOG_WARNING, "Postgresql RealTime: No database name found, using 'asterisk' as default.\n");
			strncpy(dbname, "asterisk", sizeof(dbname) - 1);
                } else {
                        strncpy(dbname, s, sizeof(dbname) - 1);
                }

		if(!(s=ast_variable_retrieve(config, "general", "dbport"))) {
                        ast_log(LOG_WARNING, "Postgresql RealTime: No database port found, using 5432 as default.\n");
			dbport = 5432;
                } else {
			dbport = atoi(s);
                }

		if(dbhost && !(s=ast_variable_retrieve(config, "general", "dbsock"))) {
                        ast_log(LOG_WARNING, "Postgresql RealTime: No database socket found, using '/tmp/pgsql.sock' as default.\n");
                        strncpy(dbsock, "/tmp/pgsql.sock", sizeof(dbsock) - 1);
                } else {
                        strncpy(dbsock, s, sizeof(dbsock) - 1);
                }
	}
	ast_config_destroy(config);

	if(dbhost) {
		ast_log(LOG_DEBUG, "Postgresql RealTime Host: %s\n", dbhost);
		ast_log(LOG_DEBUG, "Postgresql RealTime Port: %i\n", dbport);
	} else {
		ast_log(LOG_DEBUG, "Postgresql RealTime Socket: %s\n", dbsock);
	}
	ast_log(LOG_DEBUG, "Postgresql RealTime User: %s\n", dbuser);
	ast_log(LOG_DEBUG, "Postgresql RealTime Password: %s\n", dbpass);
	ast_log(LOG_DEBUG, "Postgresql RealTime DBName: %s\n", dbname);

	return 1;
}

char *description (void)
{
	return res_config_pgsql_desc;
}

int usecount (void)
{
	/* Try and get a lock. If unsuccessful, than that means another thread is using the pgsql object. */
	if(ast_mutex_trylock(&pgsql_lock)) {
		ast_log(LOG_DEBUG, "Postgresql RealTime: Module usage count is 1.\n");
		return 1;
	}
	ast_mutex_unlock(&pgsql_lock);
	return 0;
}

char *key ()
{
	return ASTERISK_GPL_KEY;
}

static int pgsql_reconnect(const char *database)
{
	char my_database[50];

	if(!database || ast_strlen_zero(database))
		ast_copy_string(my_database, dbname, sizeof(my_database));
	else
		ast_copy_string(my_database, database, sizeof(my_database));

	/* mutex lock should have been locked before calling this function. */

	if (pgsqlConn && PQstatus(pgsqlConn) != CONNECTION_OK) {
	      PQfinish(pgsqlConn);
	      pgsqlConn=NULL;
	    }

	if((!pgsqlConn) && (dbhost || dbsock) && dbuser && dbpass && my_database) {
	  char* connInfo=NULL;
	  unsigned int size=100
	    +strlen(dbhost)
	    +strlen(dbuser)
	    +strlen(dbpass)
	    +strlen(my_database);
	  connInfo=malloc(size);
	  if (!connInfo)
	    {
	      ast_log(LOG_WARNING, "Postgresql RealTime: Insufficient memory to allocate Pgsql resource.\n");
	      return 0;
	    }
	  else
	    {
	      sprintf(connInfo,"host=%s port=%d dbname=%s user=%s password=%s",
		      dbhost,dbport,my_database,dbuser,dbpass);
	      ast_log(LOG_DEBUG, "%u connInfo=%s\n", size,connInfo);
	      pgsqlConn=PQconnectdb(connInfo);	  
	      ast_log(LOG_DEBUG, "%u connInfo=%s\n", size,connInfo);
	      free(connInfo);
	      connInfo=NULL;
	      ast_log(LOG_DEBUG, "pgsqlConn=%p\n", pgsqlConn);
	      if (pgsqlConn)
		{
		  ast_log(LOG_DEBUG, "Postgresql RealTime: Successfully connected to database.\n");
		  connect_time = time(NULL);
		  return 1;
		} else {
		ast_log(LOG_ERROR, "Postgresql RealTime: Failed to connect database server %s on %s. Check debug for more info.\n", dbname, dbhost);
		ast_log(LOG_DEBUG, "Postgresql RealTime: Cannot Connect: %s\n", PQresultErrorMessage(NULL));
		return 0;
	      }
	    }
	} else {

	    ast_log(LOG_DEBUG, "Postgresql RealTime: Everything is fine.\n");
	    return 1;
	}
}

static int realtime_pgsql_status(int fd, int argc, char **argv)
{
	char status[256], status2[100] = "";
	int ctime = time(NULL) - connect_time;

	if(pgsqlConn && PQstatus(pgsqlConn) == CONNECTION_OK) {
		if(dbhost) {
			snprintf(status, 255, "Connected to %s@%s, port %d", dbname, dbhost, dbport);
		} else if(dbsock) {
			snprintf(status, 255, "Connected to %s on socket file %s", dbname, dbsock);
		} else {
			snprintf(status, 255, "Connected to %s@%s", dbname, dbhost);
		}

		if(dbuser && *dbuser) {
			snprintf(status2, 99, " with username %s", dbuser);
		}

		if (ctime > 31536000) {
			ast_cli(fd, "%s%s for %d years, %d days, %d hours, %d minutes, %d seconds.\n", status, status2, ctime / 31536000, (ctime % 31536000) / 86400, (ctime % 86400) / 3600, (ctime % 3600) / 60, ctime % 60);
		} else if (ctime > 86400) {
			ast_cli(fd, "%s%s for %d days, %d hours, %d minutes, %d seconds.\n", status, status2, ctime / 86400, (ctime % 86400) / 3600, (ctime % 3600) / 60, ctime % 60);
		} else if (ctime > 3600) {
			ast_cli(fd, "%s%s for %d hours, %d minutes, %d seconds.\n", status, status2, ctime / 3600, (ctime % 3600) / 60, ctime % 60);
		} else if (ctime > 60) {
			ast_cli(fd, "%s%s for %d minutes, %d seconds.\n", status, status2, ctime / 60, ctime % 60);
		} else {
			ast_cli(fd, "%s%s for %d seconds.\n", status, status2, ctime);
		}

		return RESULT_SUCCESS;
	} else {
		return RESULT_FAILURE;
	}
}