Return the number of rows affected by a SQL insert, rather than an object ID.

The realtime API specifies that the store callback is supposed to return the number
of rows affected. res_config_pgsql was instead returning an Oid cast as an int, which
during any nominal execution would be cast to 0. Returning 0 when more than 0 rows were
inserted causes problems to the function's callers.

To give an idea of how strange code can be, this is the necessary code change to fix
a device state issue reported against chan_pjsip in Asterisk 12+. The issue was that
the registrar would attempt to insert contacts into the database. Because of the 0
return from res_config_pgsql, the registrar would think that the contact was not successfully
inserted, even though it actually was. As such, even though the contact was query-able
and it was possible to call the endpoint, Asterisk would "think" the endpoint was unregistered,
meaning it would report the device state as UNAVAILABLE instead of NOT_INUSE.

The necessary fix applies to all versions of Asterisk, so even though the bug reported
only applies to Asterisk 12+, the code correction is being inserted into 1.8+.

Closes issue ASTERISK-23707
Reported by Mark Michelson
........

Merged revisions 413224 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@413225 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_config_pgsql.c

@@ -934,7 +934,7 @@ static int update2_pgsql(const char *database, const char *tablename, va_list ap
 static int store_pgsql(const char *database, const char *table, va_list ap)
 {
 	RAII_VAR(PGresult *, result, NULL, PQclear);
-	Oid insertid;
+	int numrows;
 	struct ast_str *buf = ast_str_thread_get(&escapebuf_buf, 256);
 	struct ast_str *sql1 = ast_str_thread_get(&sql_buf, 256);
 	struct ast_str *sql2 = ast_str_thread_get(&where_buf, 256);
@@ -994,10 +994,10 @@ static int store_pgsql(const char *database, const char *table, va_list ap)
 	        return -1;
         }
 
-	insertid = PQoidValue(result);
+	numrows = atoi(PQcmdTuples(result));
 	ast_mutex_unlock(&pgsql_lock);
 
-	ast_debug(1, "PostgreSQL RealTime: row inserted on table: %s, id: %u\n", table, insertid);
+	ast_debug(1, "PostgreSQL RealTime: row inserted on table: %s.", table);
 
 	/* From http://dev.pgsql.com/doc/pgsql/en/pgsql-affected-rows.html
 	 * An integer greater than zero indicates the number of rows affected
@@ -1005,8 +1005,9 @@ static int store_pgsql(const char *database, const char *table, va_list ap)
 	 * -1 indicates that the query returned an error (although, if the query failed, it should have been caught above.)
 	 */
 
-	if (insertid >= 0)
-		return (int) insertid;
+	if (numrows >= 0) {
+		return numrows;
+	}
 
 	return -1;
 }