flog.module in File logger 7

File logger. Dump a variable to a configurable file.

This is a simple module that allows developers to configure a log file from within Drupal and dumps variables to it from within a running Drupal app. Its sole function is to support debugging, and avoids the awkwardness of dumping variables either to the console or to the watchdog table. Instead, using the unix tail command, a developer can easily view debugging output. This is particularly useful when dumping large data structures such as nodes, menus, views, etc.

File

flog.module

<?php

/**
 * @file
 * File logger.  Dump a variable to a configurable file.
 *
 * This is a simple module that allows developers to configure a log file from within Drupal and
 * dumps variables to it from within a running Drupal app.  Its sole function is to support 
 * debugging, and avoids the awkwardness of dumping variables either to the console or to the 
 * watchdog table.  Instead, using the unix tail command, a developer can easily view debugging 
 * output.  This is particularly useful when dumping large data structures such as nodes, menus,
 * views, etc.
 */

/**
 * Implementation of hook_menu()
 */
function flog_menu() {
  $items['admin/config/development/flog'] = array(
    'title' => 'File logging',
    'description' => 'Simple file-based logging.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array(
      'flog_settings',
    ),
    'access arguments' => array(
      'administer site configuration',
    ),
    'file' => 'flog.admin.inc',
  );
  return $items;
}

/**
 * Dump a variable to a file.
 *
 * @param $var
 *  The variable you wish to dump.  Formatted using print_r()
 * @param $label
 *  An optional label to include with the output.
 * @param $filename
 *  An optional filename to write to. If not provided uses the default.
 * @return
 *  TRUE: file write succeeded
 *  FALSE: file write failed
 *
 * @see print_r()
 */
function flog_it($var, $label = NULL, $filename = NULL) {
  if (!variable_get('flog_enabled', 0)) {
    return FALSE;
  }
  if (!($path = variable_get('flog_path', '/var/log'))) {
    watchdog('flog', 'No path defined for log file.', array(), WATCHDOG_ERROR);
    return FALSE;
  }
  if (!isset($filename)) {
    if (!($filename = variable_get('flog_file', 'drupal.log'))) {
      watchdog('flog', 'No name defined for default log file.', array(), WATCHDOG_ERROR);
      return FALSE;
    }
  }
  $logfile = $path . '/' . $filename;
  $date_format = variable_get('flog_date', 'Y-m-d H:i:s');
  $formatted_var = print_r($var, TRUE);
  $output = $date_format ? '[' . date($date_format) . '] ' : '';
  $output .= $label ? '(' . $label . ') ' : '';
  $output .= $formatted_var . "\n";

  // Open the log file, or create it if it doesn't exist.
  if (!($handle = fopen($logfile, 'a'))) {
    watchdog('flog', 'Cannot open log file %file', array(
      '%file' => $logfile,
    ), WATCHDOG_ERROR);
    return FALSE;
  }
  if (fwrite($handle, $output) === FALSE) {
    watchdog('flog', 'Cannot write log file %file', array(
      '%file' => $logfile,
    ), WATCHDOG_ERROR);
    return FALSE;
  }
  fclose($handle);
  return TRUE;
}

/**
 * Dump the php stack to a file using debug_backtrace().
 *
 * @param $label
 *  An optional label to include with the output.
 * @param $filename
 *  An optional filename to write to. If not provided uses the default.
 * @return
 *  TRUE: file write succeeded
 *  FALSE: file write failed
 *
 * @see print_r()
 * @see debug_backtrace()
 */
function flog_stack($label = 'STACK', $filename = NULL) {
  $results = '';
  $trace = debug_backtrace();
  foreach ($trace as $trace_item) {
    $line = isset($trace_item['line']) ? $trace_item['line'] : '<unknown>';
    $results .= $trace_item['function'] . ', from line ' . $line . " in\n";
  }
  return flog_it($results, $label, $filename);
}

Functions

Name	Description
flog_it	Dump a variable to a file.
flog_menu	Implementation of hook_menu()
flog_stack	Dump the php stack to a file using debug_backtrace().