lib/mysql.php


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<?php

# do not include twice
if (isset($mysql))
  return;

require_once "../init.php";
include_once BASE . "/lib/http.php";
include_once BASE . "/lib/mysql-joins.php";

$mysql = new mysqli("localhost", "webserver", "empty", "buildmaster");
if ( $mysql -> connect_error ) {
  die_500( "Connection failed: " . $mysql -> connect_error );
}

function print_important_trace_components($call) {
  return substr($call['file'], strlen(BASE)+1) . '(' . $call['line'] . ')';
}

function mysql_log_duration_and_trace($start) {
  $start = round((microtime(true) - $start) * 1000000);
  $trace = debug_backtrace();
  array_shift($trace);
  // silently fail if logfile is unavailable
  if (($fp = fopen(BASE . '/log', 'a')) !== false) {
    flock($fp, LOCK_EX);
    fwrite($fp,
      date('Y-m-d H:i:s') . " " .
      $start . " " .
      implode(' ', array_map('print_important_trace_components', $trace)) . " - " .
      $trace[0]['args'][0] . "\n"
    );
    flock($fp, LOCK_UN);
    fclose($fp);
  }
}

function mysql_run_query($query) {
  global $mysql;
  $start = microtime(true);
  if ( ! $result = $mysql -> query($query) )
    die_500( "Query failed: " .  $mysql -> error );
  mysql_log_duration_and_trace($start);
  return $result;
}

function mysql_prepare_query($query) {
  global $mysql;
  $start = microtime(true);
  if ( ! $result = $mysql -> prepare($query) )
    die_500( "Prepare failed: " . $mysql -> error );
  mysql_log_duration_and_trace($start);
  return $result;
}

function show_warning_on_offline_slave() {
  $result = mysql_run_query("SHOW STATUS LIKE \"Slave_running\"");
  if (($result -> num_rows == 0) ||
    ($result -> fetch_assoc() ["Value"] != "ON")) {
    print "<div><font color=\"ff0000\">The replication slave is currently not running. The database might be outdated.</font></div>\n";
  }
}