Pressflow 6 with mysql Replication

Pressflow6 should support database replication according to the pressflow wiki. but when I configured master and slave, pressflow instance always pick master. If master was down, site couldn't load and site redirected to the site-offline error page.

I did some modifications in database.inc, database.mysqli.inc and settings.php in order to work when master mysql server was down.

Scenario

1. If mysql master is inactive, connect to Slave,
2. if slave is inactive but Master is active, then connect to Master
3. if Master and Slave both are inactive, Redirect user to Offline page

Modifications can be found in red text.

database.inc

1. Below change will modify the db_connect call to Master instance by passing 2nd parameter ("master") and by assigning $db_slave_conns[$name] values to $active_db.
2. Validate before slave connection create. If master is active we are not calling Slave by adding $db_conns[$name]->connect_errno > 0 

function db_set_active($name = 'default') {
  global $db_url, $db_slave_url, $db_type, $active_db, $active_slave_db;
  static $db_conns, $db_slave_conns, $active_name = FALSE;


  if (empty($db_url)) {
    include_once 'includes/install.inc';
    install_goto('install.php');
  }


  if (!isset($db_conns[$name])) {
    // Initiate a new connection, using the named DB URL specified.
    if (is_array($db_url)) {
      $connect_url = array_key_exists($name, $db_url) ? $db_url[$name] : $db_url['default'];
      if (is_array($db_slave_url[$name])) {
        $slave_index = mt_rand(0, count($db_slave_url[$name]) - 1);
        $slave_connect_url = $db_slave_url[$name][$slave_index];
      }
      else {
        $slave_connect_url = $db_slave_url[$name];        
      }
    }
    else {
      $connect_url = $db_url;
      if (is_array($db_slave_url)) {
        $slave_index = mt_rand(0, count($db_slave_url) - 1);
        $slave_connect_url = $db_slave_url[$slave_index];
      }
      else {
        $slave_connect_url = $db_slave_url;        
      }
    }


    $db_type = substr($connect_url, 0, strpos($connect_url, '://'));
    $handler = "./includes/database.$db_type.inc";


    if (is_file($handler)) {
      include_once $handler;
    }
    else {
      _db_error_page("The database type '". $db_type ."' is unsupported. Please use either 'mysql' or 'mysqli' for MySQL, or 'pgsql' for PostgreSQL databases.");
    }


    $db_conns[$name] = db_connect($connect_url,'master');
    if ($db_conns[$name]->connect_errno > 0 && !empty($slave_connect_url)) {
      $db_slave_conns[$name] = db_connect($slave_connect_url); 
    }
  }


  $previous_name = $active_name;
  // Set the active connection.
  $active_name = $name;
  $active_db = $db_conns[$name];
  if (isset($db_slave_conns[$name])) {
    $active_slave_db = $db_slave_conns[$name];
    $active_db = $db_slave_conns[$name];    
  }
  else {
    unset($active_slave_db);
  }


  return $previous_name;
}