<?
$connection = new mysqli(<server>,<user>,<password>);
$ttl = 0.060;

/* sql related functions */
function fetchRows($query)
{
  global $connection;
  $rs = $connection->query($query);
  $rows = array();
  while ($row=$rs->fetch_assoc()) {
    $rows[] = $row;
  }
  $rs->free();
  return $rows;
}

function execSQL($query)
{
  global $connection;
  
  if ( !$connection->multi_query($query) )
    throw new Exception("mysql error - " . mysqli_error($connection));
  
  $res = array();

  do
  {
      $res[] = array("affected_rows"=>$connection->affected_rows,"rows"=>array());
      $extraResult = $connection->use_result();
      if($extraResult instanceof mysqli_result){
          while ($row=$extraResult->fetch_assoc()) {
            $res[count($res)-1]["rows"][] = $row; 
          }
      
          $extraResult->free();
      }
  }
  while($connection->more_results() && $connection->next_result());
                  
  return $res;    
}

/* galera related functions */
function getWSREPStatus()
{
  $statuses = array();
  
  $rows = fetchRows("SHOW STATUS LIKE 'wsrep_%'");
  foreach ( $rows as $r )
    $statuses[$r["Variable_name"]] = $r["Value"];
    
  return $statuses;
}

/* test related functions */

// create test database and table
function setupTestEnv()
{
  execSQL("CREATE DATABASE IF NOT EXISTS test_cluster");
  execSQL("USE test_cluster");
  execSQL("DROP TABLE IF EXISTS test");
  execSQL("CREATE TABLE `test` (
   `users_xsite_id` int(10) unsigned NOT NULL,
   `xsite_templates_prototypes_id` int(10) unsigned NOT NULL,
   `html` longtext,
   `type` enum('smartphone','facebook_fangate','facebook','desktop') NOT NULL,
   PRIMARY KEY (users_xsite_id,xsite_templates_prototypes_id,type) 
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=COMPRESSED");
}

// perform test
function performTest($size)
{
  global $connection;
  global $ttl;
  
  // step 1: reset 
  execSQL("USE test_cluster");
  execSQL("DELETE FROM test WHERE 1;");
  
  execSQL("START TRANSACTION;");
  execSQL("INSERT INTO test(users_xsite_id,xsite_templates_prototypes_id,type,html) VALUES(241383,5,'desktop','');");
  execSQL("COMMIT;");
  
  execSQL("START TRANSACTION;");
  execSQL("UPDATE test SET html=REPEAT('a',$size) WHERE users_xsite_id=241383 and xsite_templates_prototypes_id=5 and type='desktop';");  
  execSQL("COMMIT;");

  // step 2: perform N iterations of test, capture results  
  $times = array();
  
  $over2TTLCount = 0;
    
  for ( $i = 0 ; $i < 50 ; $i++ )
  {
    // time capture  
    $d = microtime(true);
    
    // execute query
    $res = execSQL("
            START TRANSACTION;
            UPDATE test SET html=REPEAT('" . $i%10 . "',$size) WHERE users_xsite_id=241383 and xsite_templates_prototypes_id=5 and type='desktop';  
            COMMIT;
            ");

    // capture time difference
    $time = ( microtime(true) - $d );
    
    // validate query  
    if ( $res[1]["affected_rows"] != 1 )
      throw new Exception("no rows affected!");
      
    // populate result variables
    if ( $time > 2*$ttl)
      $over2TTLCount++;    
    $times[] = $time; 
  }

  // validate result of queries  
  if ( fetchRows("SELECT COUNT(*) AS cnt FROM test")[0]["cnt"] != 1 )
    throw new Exception("too many rows");

  // print out result 
  echo $size . " .times. " . implode(" ",$times) . " .over_2ttl_count. $over2TTLCount\n";// . " .bytes_sent. " . implode(" ",$bytesSent) . " .bytes_received. " . implode(" ",$bytesReceived) . "\n";    
}

// print out general information
echo "cluster size: " . getWSREPStatus()["wsrep_cluster_size"] . "\n";

// setup test environment
setupTestEnv();

// perform tests with growing data size
for ( $i = 32 ; $i < 128 ; $i++ )
  performTest(1024*$i);
?>

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