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* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Monolog\Handler; use Monolog\Logger; /** * Simple handler wrapper that deduplicates log records across multiple requests * * It also includes the BufferHandler functionality and will buffer * all messages until the end of the request or flush() is called. * * This works by storing all log records' messages above $deduplicationLevel * to the file specified by $deduplicationStore. When further logs come in at the end of the * request (or when flush() is called), all those above $deduplicationLevel are checked * against the existing stored logs. If they match and the timestamps in the stored log is * not older than $time seconds, the new log record is discarded. If no log record is new, the * whole data set is discarded. * * This is mainly useful in combination with Mail handlers or things like Slack or HipChat handlers * that send messages to people, to avoid spamming with the same message over and over in case of * a major component failure like a database server being down which makes all requests fail in the * same way. * * @author Jordi Boggiano
*/ class DeduplicationHandler extends BufferHandler { /** * @var string */ protected $deduplicationStore; /** * @var int */ protected $deduplicationLevel; /** * @var int */ protected $time; /** * @var bool */ private $gc = false; /** * @param HandlerInterface $handler Handler. * @param string $deduplicationStore The file/path where the deduplication log should be kept * @param int $deduplicationLevel The minimum logging level for log records to be looked at for deduplication purposes * @param int $time The period (in seconds) during which duplicate entries should be suppressed after a given log is sent through * @param bool $bubble Whether the messages that are handled can bubble up the stack or not */ public function __construct(HandlerInterface $handler, $deduplicationStore = null, $deduplicationLevel = Logger::ERROR, $time = 60, $bubble = true) { parent::__construct($handler, 0, Logger::DEBUG, $bubble, false); $this->deduplicationStore = $deduplicationStore === null ? sys_get_temp_dir() . '/monolog-dedup-' . substr(md5(__FILE__), 0, 20) .'.log' : $deduplicationStore; $this->deduplicationLevel = Logger::toMonologLevel($deduplicationLevel); $this->time = $time; } public function flush() { if ($this->bufferSize === 0) { return; } $passthru = null; foreach ($this->buffer as $record) { if ($record['level'] >= $this->deduplicationLevel) { $passthru = $passthru || !$this->isDuplicate($record); if ($passthru) { $this->appendRecord($record); } } } // default of null is valid as well as if no record matches duplicationLevel we just pass through if ($passthru === true || $passthru === null) { $this->handler->handleBatch($this->buffer); } $this->clear(); if ($this->gc) { $this->collectLogs(); } } private function isDuplicate(array $record) { if (!file_exists($this->deduplicationStore)) { return false; } $store = file($this->deduplicationStore, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES); if (!is_array($store)) { return false; } $yesterday = time() - 86400; $timestampValidity = $record['datetime']->getTimestamp() - $this->time; $expectedMessage = preg_replace('{[\r\n].*}', '', $record['message']); for ($i = count($store) - 1; $i >= 0; $i--) { list($timestamp, $level, $message) = explode(':', $store[$i], 3); if ($level === $record['level_name'] && $message === $expectedMessage && $timestamp > $timestampValidity) { return true; } if ($timestamp < $yesterday) { $this->gc = true; } } return false; } private function collectLogs() { if (!file_exists($this->deduplicationStore)) { return false; } $handle = fopen($this->deduplicationStore, 'rw+'); flock($handle, LOCK_EX); $validLogs = array(); $timestampValidity = time() - $this->time; while (!feof($handle)) { $log = fgets($handle); if (substr($log, 0, 10) >= $timestampValidity) { $validLogs[] = $log; } } ftruncate($handle, 0); rewind($handle); foreach ($validLogs as $log) { fwrite($handle, $log); } flock($handle, LOCK_UN); fclose($handle); $this->gc = false; } private function appendRecord(array $record) { file_put_contents($this->deduplicationStore, $record['datetime']->getTimestamp() . ':' . $record['level_name'] . ':' . preg_replace('{[\r\n].*}', '', $record['message']) . "\n", FILE_APPEND); } }