storagedriver: added download abortable task

storagedriver.py

 from disk import Disk
 from disk import Disk
 from storagecelery import celery
 from storagecelery import celery
 from os import path, unlink, statvfs
 from os import path, unlink, statvfs
+from celery.contrib.abortable import AbortableTask
 
 
 
 
 @celery.task()
 @celery.task()
@@ -14,6 +15,17 @@ def create(disk_desc):
     disk.create()
     disk.create()
 
 
 
 
+class download(AbortableTask):
+    time_limit = 18000  # TODO: calculate proper value it's 5h now
+
+    def run(self, **kwargs):
+        disk_desc = kwargs['disk']
+        url = kwargs['url']
+        disk = Disk.deserialize(disk_desc)
+        disk.download(self, url)
+        return disk.size
+
+
 @celery.task()
 @celery.task()
 def delete(json_data):
 def delete(json_data):
     disk = Disk.deserialize(json_data)
     disk = Disk.deserialize(json_data)