HexMakina / LogLaddy

LogLaddy.php

<?php
/*
 * LogLaddy
 *
 * I carry a log – yes. Is it funny to you? It is not to me.
 * Behind all things are reasons. Reasons can even explain the absurd.
 *
 * LogLaddy manages error reporting
 * PSR-3 Compliant, with a NICE bonus
 */

namespace HexMakina\LogLaddy;

class LogLaddy implements LoggerInterface
{
  use \Psr\Log\LoggerTrait;           // PSR implementation
  use \HexMakina\Debugger\Debugger;   // Debugger

  const REPORTING_USER = 'user_messages';
  const INTERNAL_ERROR = 'error';
  const USER_EXCEPTION = 'exception';
  const LOG_LEVEL_SUCCESS = 'ok';

  private $has_halting_messages = false;

  /**
   * Everything went fine, which is always nice.
   * LogLaddy is a bit more optimistic than PSRLog
   * @param string $message
   * @param array  $context
   *
   * @return void
   */

  public function nice($message, array $context = array())
  {
      $this->log(LogLevel::NICE, $message, $context);
  }

  // -- Static handlers for error, use set_error_handler('\HexMakina\kadro\Logger\LogLaddy::error_handler')
  public static function error_handler($level, $message, $file = '', $line = 0)
  {
    $loglevel = self::map_error_level_to_log_level($level);

    (new LogLaddy())->$loglevel($message, ['file' => $file, 'line' => $line, 'trace' => debug_backtrace()]);
  }

  // -- Static handlers for throwables, use set_exception_handler('\HexMakina\kadro\Logger\LogLaddy::exception_handler');
  public static function exception_handler(\Throwable $throwable)
  {
    $context = [];
    $context['text'] = $throwable->getMessage();
    $context['file'] = $throwable->getFile();
    $context['line'] = $throwable->getLine();
    $context['code'] = $throwable->getCode();
    $context['class'] = get_class($throwable);
    $context['trace'] = $throwable->getTrace();

    $lad = new LogLaddy();
    if(is_subclass_of($throwable, 'Error') || get_class($throwable) === 'Error')
      $lad->alert(self::INTERNAL_ERROR, $context);
    elseif(is_subclass_of($throwable, 'Exception') || get_class($throwable) === 'Exception')
      $lad->notice(self::USER_EXCEPTION, $context);
    else
      $lad->critical('Caught a Throwable that is not an Error or an Exception. This breaks everything.', $context);
  }

  public function system_halted($level)
  {
    switch($level)
    {
      case LogLevel::ERROR:
      case LogLevel::CRITICAL:
      case LogLevel::ALERT:
      case LogLevel::EMERGENCY:
        return true;
    }
    return false;
  }

  // -- Implementation of LoggerInterface::log(), all other methods are in LoggerTrait

  public function log($level, $message, array $context = [])
  {
    $display_error = null;

    // --- Handles Throwables (exception_handler())
    if($message==self::INTERNAL_ERROR || $message== self::USER_EXCEPTION)
    {
      $this->has_halting_messages = true;
      $display_error = self::format_throwable_message($context['class'], $context['code'], $context['file'], $context['line'], $context['text']);
      error_log($display_error);
      $display_error.= self::format_trace($context['trace'], false);
      self::HTTP_500($display_error);
    }
    elseif($this->system_halted($level)) // analyses error level
    {
      $display_error = sprintf(PHP_EOL.'%s in file %s:%d'.PHP_EOL.'%s', $level, self::format_file($context['file']), $context['line'], $message);
      error_log($display_error);
      $display_error.= self::format_trace($context['trace'], true);
      self::HTTP_500($display_error);
    }
    else
    {// --- Handles user messages, through SESSION storage
      $this->report_to_user($level, $message, $context);
    }
  }

  public static function HTTP_500($display_error)
  {
    self::display_errors($display_error);
    http_response_code(500);
    die;

Using exit here is not recommended.

  }
  // -- Allows to know if script must be halted after fatal error
  // TODO NEH.. not good
  public function has_halting_messages()
  {
    return $this->has_halting_messages === true;
  }

  // -- User messages

  // -- User messages:add one
  public function report_to_user($level, $message, $context = [])
  {
    if(!isset($_SESSION[self::REPORTING_USER]))
      $_SESSION[self::REPORTING_USER] = [];

    if(!isset($_SESSION[self::REPORTING_USER][$level]))
      $_SESSION[self::REPORTING_USER][$level] = [];

    $_SESSION[self::REPORTING_USER][$level][] = [$message, $context];
  }

  // -- User messages:get all
  public function get_user_report()
  {
    return $_SESSION[self::REPORTING_USER] ?? [];
  }

  // -- User messages:reset all
  public function clean_user_report()
  {
    unset($_SESSION[self::REPORTING_USER]);
  }

  // -- Error level mapping from \Psr\Log\LogLevel.php & http://php.net/manual/en/errorfunc.constants.php
  /** Error level meaning , from \Psr\Log\LogLevel.php
   * const EMERGENCY = 'emergency'; // System is unusable.
   * const ALERT     = 'alert'; // Action must be taken immediately, Example: Entire website down, database unavailable, etc.
   * const CRITICAL  = 'critical';  // Application component unavailable, unexpected exception.
   * const ERROR     = 'error'; // Run time errors that do not require immediate action
   * const WARNING   = 'warning'; // Exceptional occurrences that are not errors, undesirable things that are not necessarily wrong
   * const NOTICE    = 'notice'; // Normal but significant events.
   * const INFO      = 'info'; // Interesting events. User logs in, SQL logs.
   * const DEBUG     = 'debug'; // Detailed debug information.
  */
  private static function map_error_level_to_log_level($level) : string
  {
    // http://php.net/manual/en/errorfunc.constants.php
    $m=[];

    $m[E_ERROR]=$m[E_PARSE]=$m[E_CORE_ERROR]=$m[E_COMPILE_ERROR]=$m[E_USER_ERROR]=$m[E_RECOVERABLE_ERROR]=LogLevel::ALERT;
    $m[1]=$m[4]=$m[16]=$m[64]=$m[256]=$m[4096]=LogLevel::ALERT;

    $m[E_WARNING]=$m[E_CORE_WARNING]=$m[E_COMPILE_WARNING]=$m[E_USER_WARNING]=LogLevel::CRITICAL;
    $m[2]=$m[32]=$m[128]=$m[512]=LogLevel::CRITICAL;

    $m[E_NOTICE]=$m[E_USER_NOTICE]=LogLevel::ERROR;
    $m[8]=$m[1024]=LogLevel::ERROR;

    $m[E_STRICT]=$m[E_DEPRECATED]=$m[E_USER_DEPRECATED]=$m[E_ALL]=LogLevel::DEBUG;
    $m[2048]=$m[8192]=$m[16384]=$m[32767]=LogLevel::DEBUG;

    if(isset($m[$level]))
      return $m[$level];

    throw new \Exception(__FUNCTION__."($level): $level is unknown");
  }
}