diff core/modules/dblog/src/Logger/DbLog.php @ 0:c75dbcec494b

Initial commit from drush-created site

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/dblog/src/Logger/DbLog.php	Thu Jul 05 14:24:15 2018 +0000
@@ -0,0 +1,112 @@
+<?php
+
+namespace Drupal\dblog\Logger;
+
+use Drupal\Component\Utility\Unicode;
+use Drupal\Core\Database\Connection;
+use Drupal\Core\Database\Database;
+use Drupal\Core\Database\DatabaseException;
+use Drupal\Core\DependencyInjection\DependencySerializationTrait;
+use Drupal\Core\Logger\LogMessageParserInterface;
+use Drupal\Core\Logger\RfcLoggerTrait;
+use Psr\Log\LoggerInterface;
+
+/**
+ * Logs events in the watchdog database table.
+ */
+class DbLog implements LoggerInterface {
+  use RfcLoggerTrait;
+  use DependencySerializationTrait;
+
+  /**
+   * The dedicated database connection target to use for log entries.
+   */
+  const DEDICATED_DBLOG_CONNECTION_TARGET = 'dedicated_dblog';
+
+  /**
+   * The database connection object.
+   *
+   * @var \Drupal\Core\Database\Connection
+   */
+  protected $connection;
+
+  /**
+   * The message's placeholders parser.
+   *
+   * @var \Drupal\Core\Logger\LogMessageParserInterface
+   */
+  protected $parser;
+
+  /**
+   * Constructs a DbLog object.
+   *
+   * @param \Drupal\Core\Database\Connection $connection
+   *   The database connection object.
+   * @param \Drupal\Core\Logger\LogMessageParserInterface $parser
+   *   The parser to use when extracting message variables.
+   */
+  public function __construct(Connection $connection, LogMessageParserInterface $parser) {
+    $this->connection = $connection;
+    $this->parser = $parser;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function log($level, $message, array $context = []) {
+    // Remove any backtraces since they may contain an unserializable variable.
+    unset($context['backtrace']);
+
+    // Convert PSR3-style messages to SafeMarkup::format() style, so they can be
+    // translated too in runtime.
+    $message_placeholders = $this->parser->parseMessagePlaceholders($message, $context);
+
+    try {
+      $this->connection
+        ->insert('watchdog')
+        ->fields([
+          'uid' => $context['uid'],
+          'type' => Unicode::substr($context['channel'], 0, 64),
+          'message' => $message,
+          'variables' => serialize($message_placeholders),
+          'severity' => $level,
+          'link' => $context['link'],
+          'location' => $context['request_uri'],
+          'referer' => $context['referer'],
+          'hostname' => Unicode::substr($context['ip'], 0, 128),
+          'timestamp' => $context['timestamp'],
+        ])
+        ->execute();
+    }
+    catch (\Exception $e) {
+      // When running Drupal on MySQL or MariaDB you can run into several errors
+      // that corrupt the database connection. Some examples for these kind of
+      // errors on the database layer are "1100 - Table 'xyz' was not locked
+      // with LOCK TABLES" and "1153 - Got a packet bigger than
+      // 'max_allowed_packet' bytes". If such an error happens, the MySQL server
+      // invalidates the connection and answers all further requests in this
+      // connection with "2006 - MySQL server had gone away". In that case the
+      // insert statement above results in a database exception. To ensure that
+      // the causal error is written to the log we try once to open a dedicated
+      // connection and write again.
+      if (
+        // Only handle database related exceptions.
+        ($e instanceof DatabaseException || $e instanceof \PDOException) &&
+        // Avoid an endless loop of re-write attempts.
+        $this->connection->getTarget() != self::DEDICATED_DBLOG_CONNECTION_TARGET
+      ) {
+        // Open a dedicated connection for logging.
+        $key = $this->connection->getKey();
+        $info = Database::getConnectionInfo($key);
+        Database::addConnectionInfo($key, self::DEDICATED_DBLOG_CONNECTION_TARGET, $info['default']);
+        $this->connection = Database::getConnection(self::DEDICATED_DBLOG_CONNECTION_TARGET, $key);
+        // Now try once to log the error again.
+        $this->log($level, $message, $context);
+      }
+      else {
+        throw $e;
+      }
+    }
+  }
+
+}