take read handle as argument instead of file path

lbrynet/blob/blob_file.py

@@ -78,7 +78,8 @@ class BlobFile(object):
         finished
         """
         if self._verified is True:
-            reader = HashBlobReader(self.file_path, self.reader_finished)
+            f = open(self.file_path, 'rb')
+            reader = HashBlobReader(f, self.reader_finished)
             self.readers += 1
             return reader
         return None

lbrynet/blob/reader.py

@@ -39,16 +39,15 @@ class HashBlobReader(object):
     This is a file like reader class that supports
     read(size) and close()
     """
-    def __init__(self, file_path, finished_cb):
-        self.file_path = file_path
+    def __init__(self, read_handle, finished_cb):
         self.finished_cb = finished_cb
         self.finished_cb_d = None
-        self.read_handle = open(self.file_path, 'rb')
+        self.read_handle = read_handle
 
     def __del__(self):
         if self.finished_cb_d is None:
             log.warn("Garbage collection was called, but reader for %s was not closed yet",
-                        self.file_path)
+                        self.read_handle.name)
         self.close()
 
     def read(self, size=-1):