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   1  <?php
   2  
   3  namespace dokuwiki;
   4  
   5  class Logger
   6  {
   7      const LOG_ERROR = 'error';
   8      const LOG_DEPRECATED = 'deprecated';
   9      const LOG_DEBUG = 'debug';
  10  
  11      /** @var Logger[] */
  12      static protected $instances;
  13  
  14      /** @var string what kind of log is this */
  15      protected $facility;
  16  
  17      protected $isLogging = true;
  18  
  19      /**
  20       * Logger constructor.
  21       *
  22       * @param string $facility The type of log
  23       */
  24      protected function __construct($facility)
  25      {
  26          global $conf;
  27          $this->facility = $facility;
  28  
  29          // Should logging be disabled for this facility?
  30          $dontlog = explode(',', $conf['dontlog']);
  31          $dontlog = array_map('trim', $dontlog);
  32          if (in_array($facility, $dontlog)) $this->isLogging = false;
  33      }
  34  
  35      /**
  36       * Return a Logger instance for the given facility
  37       *
  38       * @param string $facility The type of log
  39       * @return Logger
  40       */
  41      static public function getInstance($facility = self::LOG_ERROR)
  42      {
  43          if (empty(self::$instances[$facility])) {
  44              self::$instances[$facility] = new Logger($facility);
  45          }
  46          return self::$instances[$facility];
  47      }
  48  
  49      /**
  50       * Convenience method to directly log to the error log
  51       *
  52       * @param string $message The log message
  53       * @param mixed $details Any details that should be added to the log entry
  54       * @param string $file A source filename if this is related to a source position
  55       * @param int $line A line number for the above file
  56       * @return bool has a log been written?
  57       */
  58      static public function error($message, $details = null, $file = '', $line = 0)
  59      {
  60          return self::getInstance(self::LOG_ERROR)->log(
  61              $message, $details, $file, $line
  62          );
  63      }
  64  
  65      /**
  66       * Convenience method to directly log to the debug log
  67       *
  68       * @param string $message The log message
  69       * @param mixed $details Any details that should be added to the log entry
  70       * @param string $file A source filename if this is related to a source position
  71       * @param int $line A line number for the above file
  72       * @return bool has a log been written?
  73       */
  74      static public function debug($message, $details = null, $file = '', $line = 0)
  75      {
  76          return self::getInstance(self::LOG_DEBUG)->log(
  77              $message, $details, $file, $line
  78          );
  79      }
  80  
  81      /**
  82       * Convenience method to directly log to the deprecation log
  83       *
  84       * @param string $message The log message
  85       * @param mixed $details Any details that should be added to the log entry
  86       * @param string $file A source filename if this is related to a source position
  87       * @param int $line A line number for the above file
  88       * @return bool has a log been written?
  89       */
  90      static public function deprecated($message, $details = null, $file = '', $line = 0)
  91      {
  92          return self::getInstance(self::LOG_DEPRECATED)->log(
  93              $message, $details, $file, $line
  94          );
  95      }
  96  
  97      /**
  98       * Log a message to the facility log
  99       *
 100       * @param string $message The log message
 101       * @param mixed $details Any details that should be added to the log entry
 102       * @param string $file A source filename if this is related to a source position
 103       * @param int $line A line number for the above file
 104       * @return bool has a log been written?
 105       */
 106      public function log($message, $details = null, $file = '', $line = 0)
 107      {
 108          if(!$this->isLogging) return false;
 109  
 110          // details are logged indented
 111          if ($details) {
 112              if (!is_string($details)) {
 113                  $details = json_encode($details, JSON_PRETTY_PRINT);
 114              }
 115              $details = explode("\n", $details);
 116              $loglines = array_map(function ($line) {
 117                  return '  ' . $line;
 118              }, $details);
 119          } elseif ($details) {
 120              $loglines = [$details];
 121          } else {
 122              $loglines = [];
 123          }
 124  
 125          // datetime, fileline, message
 126          $logline = gmdate('Y-m-d H:i:s') . "\t";
 127          if ($file) {
 128              $logline .= $file;
 129              if ($line) $logline .= "($line)";
 130          }
 131          $logline .= "\t" . $message;
 132  
 133          array_unshift($loglines, $logline);
 134          return $this->writeLogLines($loglines);
 135      }
 136  
 137      /**
 138       * Construct the log file for the given day
 139       *
 140       * @param false|string|int $date Date to access, false for today
 141       * @return string
 142       */
 143      public function getLogfile($date = false)
 144      {
 145          global $conf;
 146  
 147          if ($date !== null) $date = strtotime($date);
 148          if (!$date) $date = time();
 149  
 150          return $conf['logdir'] . '/' . $this->facility . '/' . date('Y-m-d', $date) . '.log';
 151      }
 152  
 153      /**
 154       * Write the given lines to today's facility log
 155       *
 156       * @param string[] $lines the raw lines to append to the log
 157       * @return bool true if the log was written
 158       */
 159      protected function writeLogLines($lines)
 160      {
 161          $logfile = $this->getLogfile();
 162          return io_saveFile($logfile, join("\n", $lines) . "\n", true);
 163      }
 164  }