Issue #5637 - Realtime driver for PostgreSQL (mguesdon)

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@17628 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 793 insertions, 0 deletions

diff --git a/res/res_config_pgsql.c b/res/res_config_pgsql.c
new file mode 100644
index 000000000..4ef55b295
--- /dev/null
+++ b/res/res_config_pgsql.c
@@ -0,0 +1,793 @@
+/*
+ * 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);
+
+STANDARD_LOCAL_USER;
+
+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_config *new;
+	struct ast_variable *cur_v, *new_v;
+	struct ast_category *cur_cat, *new_cat;
+	char sql[250] = "";
+	char last[80] = "";
+	int cat_started = 0;
+	int var_started = 0;
+	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 %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++)
+	    {
+	      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;
+	}
+}