Fix BlobIterator

Now we do not update index during iteration which leads
to the fact that BlobIterator returns incorrect data if
a file size exceeds chunk size (default 65536 bytes)

Change-Id: Id2b5f9efe29518106e097d237827ec481f22127b

glare/common/utils.py

@@ -518,6 +518,7 @@ class BlobIterator(object):
         while bytes_left > 0:
             data = self.data[i * self.chunk_size:(i + 1) * self.chunk_size]
             bytes_left -= len(data)
+            i += 1
             yield data
         raise StopIteration()
 

glare/tests/unit/test_utils.py

@@ -238,6 +238,15 @@ class TestReaders(base.BaseTestCase):
 
         self.assertEqual(BYTES, bytes_read)
 
+    def test_blob_iterator_big_data(self):
+        BYTES = 1000000
+        bytes_read = 0
+        stream = [b'*'] * BYTES
+        for chunk in utils.BlobIterator(stream):
+            bytes_read += len(chunk)
+
+        self.assertEqual(BYTES, bytes_read)
+
 
 class TestKeyCert(base.BaseTestCase):