Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/syslog/src/Logger/SysLog.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\syslog\Logger\SysLog.
+ */
+
+namespace Drupal\syslog\Logger;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Logger\LogMessageParserInterface;
+use Drupal\Core\Logger\RfcLoggerTrait;
+use Psr\Log\LoggerInterface;
+
+/**
+ * Redirects logging messages to syslog.
+ */
+class SysLog implements LoggerInterface {
+  use RfcLoggerTrait;
+
+  /**
+   * A configuration object containing syslog settings.
+   *
+   * @var \Drupal\Core\Config\Config
+   */
+  protected $config;
+
+  /**
+   * The message's placeholders parser.
+   *
+   * @var \Drupal\Core\Logger\LogMessageParserInterface
+   */
+  protected $parser;
+
+  /**
+   * Stores whether there is a system logger connection opened or not.
+   *
+   * @var bool
+   */
+  protected $connectionOpened = FALSE;
+
+  /**
+   * Constructs a SysLog object.
+   *
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The configuration factory object.
+   * @param \Drupal\Core\Logger\LogMessageParserInterface $parser
+   *   The parser to use when extracting message variables.
+   */
+  public function __construct(ConfigFactoryInterface $config_factory, LogMessageParserInterface $parser) {
+    $this->config = $config_factory->get('syslog.settings');
+    $this->parser = $parser;
+  }
+
+  /**
+   * Opens a connection to the system logger.
+   */
+  protected function openConnection() {
+    if (!$this->connectionOpened) {
+      $facility = $this->config->get('facility');
+      if ($facility === '') {
+        $facility = defined('LOG_LOCAL0') ? LOG_LOCAL0 : LOG_USER;
+      }
+      $this->connectionOpened = openlog($this->config->get('identity'), LOG_NDELAY, $facility);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function log($level, $message, array $context = array()) {
+    global $base_url;
+
+    // Ensure we have a connection available.
+    $this->openConnection();
+
+    // Populate the message placeholders and then replace them in the message.
+    $message_placeholders = $this->parser->parseMessagePlaceholders($message, $context);
+    $message = empty($message_placeholders) ? $message : strtr($message, $message_placeholders);
+
+    $entry = strtr($this->config->get('format'), array(
+      '!base_url' => $base_url,
+      '!timestamp' => $context['timestamp'],
+      '!type' => $context['channel'],
+      '!ip' => $context['ip'],
+      '!request_uri' => $context['request_uri'],
+      '!referer' => $context['referer'],
+      '!uid' => $context['uid'],
+      '!link' => strip_tags($context['link']),
+      '!message' => strip_tags($message),
+    ));
+
+    syslog($level, $entry);
+  }
+
+}

core/modules/syslog/src/Tests/SyslogTest.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\syslog\Tests\SyslogTest.
+ */
+
+namespace Drupal\syslog\Tests;
+
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Tests syslog settings.
+ *
+ * @group syslog
+ */
+class SyslogTest extends WebTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('syslog');
+
+  /**
+   * Tests the syslog settings page.
+   */
+  function testSettings() {
+    $admin_user = $this->drupalCreateUser(array('administer site configuration'));
+    $this->drupalLogin($admin_user);
+
+    // If we're on Windows, there is no configuration form.
+    if (defined('LOG_LOCAL6')) {
+      $this->drupalPostForm('admin/config/development/logging', array('syslog_facility' => LOG_LOCAL6), t('Save configuration'));
+      $this->assertText(t('The configuration options have been saved.'));
+
+      $this->drupalGet('admin/config/development/logging');
+      if ($this->parse()) {
+        $field = $this->xpath('//option[@value=:value]', array(':value' => LOG_LOCAL6)); // Should be one field.
+        $this->assertTrue($field[0]['selected'] == 'selected', 'Facility value saved.');
+      }
+    }
+  }
+}