Added tags to app.start

Author: allflame

src/Bridge/AppStartSpanListener.php

@@ -3,9 +3,11 @@
 
 namespace Jaeger\Symfony\Bridge;
 
+use Jaeger\Tag\DoubleTag;
+use Jaeger\Tag\LongTag;
+use Jaeger\Tag\StringTag;
 use Jaeger\Tracer\TracerInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\KernelEvents;
@@ -19,11 +21,6 @@ public function __construct(TracerInterface $tracer)
         $this->tracer = $tracer;
     }
 
-    public function getStartTime(Request $request): int
-    {
-        return (int)($request->server->get('REQUEST_TIME_FLOAT', microtime(true)) * 1000000);
-    }
-
     public static function getSubscribedEvents()
     {
         return [
@@ -35,7 +32,16 @@ public function onRequest(GetResponseEvent $event)
     {
         $request = $event->getRequest();
         if (HttpKernelInterface::MASTER_REQUEST === $event->getRequestType()) {
-            $this->tracer->finish($this->tracer->start('app.start')->start($this->getStartTime($request)));
+            $source = $request->server->has('REQUEST_TIME_FLOAT') ? 'header' : 'microtime';
+            $value = $request->server->get('REQUEST_TIME_FLOAT', microtime(true));
+            $startTime = (int)($value * 1000000);
+            $this->tracer->finish(
+                $this->tracer->start('app.start')
+                    ->addTag(new StringTag('time.source', $source))
+                    ->addTag(new DoubleTag('time.value', $value))
+                    ->addTag(new LongTag('time.micro', $startTime))
+                    ->start($startTime)
+            );
         }
 
         return $this;