Only use transactions for bulk requests (more than one request)

core/Tracker.php

@@ -235,17 +235,17 @@ class Tracker
         $this->initOutputBuffer();
 
         if (!empty($this->requests)) {
-	        $xid = self::getDatabase()->beginTransaction();
+            $this->beginTransaction();
 
             try {
                 foreach ($this->requests as $params) {
                     $isAuthenticated = $this->trackRequest($params, $tokenAuth);
                 }
                 $this->runScheduledTasksIfAllowed($isAuthenticated);
-                self::getDatabase()->commit($xid);
+                $this->commitTransaction();
             } catch(DbException $e) {
                 Common::printDebug($e->getMessage());
-                self::getDatabase()->rollback($xid);
+                $this->rollbackTransaction();
             }
 
         } else {
@@ -272,6 +272,47 @@ class Tracker
         return ob_get_contents();
     }
 
+    protected function beginTransaction()
+    {
+        $this->transactionId = null;
+        if(!$this->shouldUseTransactions()) {
+            return;
+        }
+        $this->transactionId = self::getDatabase()->beginTransaction();
+    }
+
+    protected function commitTransaction()
+    {
+        if(empty($this->transactionId)) {
+            return;
+        }
+        self::getDatabase()->commit($this->transactionId);
+    }
+
+    protected function rollbackTransaction()
+    {
+        if(empty($this->transactionId)) {
+            return;
+        }
+        self::getDatabase()->rollback($this->transactionId);
+    }
+
+    /**
+     * @return bool
+     */
+    protected function shouldUseTransactions()
+    {
+        $isBulkRequest = count($this->requests) > 1;
+        return $isBulkRequest && $this->isTransactionSupported();
+    }
+
+    /**
+     * @return bool
+     */
+    protected function isTransactionSupported()
+    {
+        return (bool) Config::getInstance()->Tracker['bulk_requests_use_transaction'];
+    }
 
     protected function shouldRunScheduledTasks()
     {
@@ -869,4 +910,6 @@ class Tracker
     {
         return file_get_contents("php://input");
     }
+
+
 }