update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/Monolog/Processor/RequestIdProcessor.php

@@ -0,0 +1,34 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+
+namespace Piwik\Plugins\Monolog\Processor;
+
+use Piwik\Common;
+
+/**
+ * Adds a unique "request id" to the log message to follow log entries for each HTTP request.
+ */
+class RequestIdProcessor
+{
+    private $currentRequestKey;
+
+    public function __invoke(array $record)
+    {
+        if (Common::isPhpCliMode()) {
+            return $record;
+        }
+
+        if (empty($this->currentRequestKey)) {
+            $this->currentRequestKey = substr(Common::generateUniqId(), 0, 5);
+        }
+
+        $record['extra']['request_id'] = $this->currentRequestKey;
+
+        return $record;
+    }
+}