Fix GMN getChecksum

Requests no longer returns a context manager for response streams.

gmn/src/d1_gmn/app/views/external.py

@@ -255,10 +255,10 @@ def get_checksum(request, pid):
         )
 
     sciobj_model = d1_gmn.app.models.ScienceObject.objects.get(pid__did=pid)
-    with _get_sciobj_iter(sciobj_model) as sciobj_iter:
-        checksum_obj = d1_common.checksum.create_checksum_object_from_iterator(
-            sciobj_iter, algorithm
-        )
+    sciobj_iter = _get_sciobj_iter(sciobj_model)
+    checksum_obj = d1_common.checksum.create_checksum_object_from_iterator(
+        sciobj_iter, algorithm
+    )
     # Log the access of this object.
     # TODO: look into log type other than 'read'
     d1_gmn.app.event_log.log_read_event(pid, request)

lib_common/src/d1_common/iter/stream.py

@@ -46,8 +46,7 @@ def __enter__(self):
         return self
 
     def __exit__(self, type, value, traceback):
-        if hasattr(self._stream, "close"):
-            self._stream.close()
+        self.close()
 
     def __iter__(self):
         """Returns: Chunks of ``read()`` on stream.
@@ -59,6 +58,7 @@ def __iter__(self):
         while True:
             chunk_str = self._stream.read(self._chunk_size)
             if not chunk_str:
+                self.close()
                 break
             yield chunk_str
 
@@ -78,3 +78,7 @@ def size(self):
             size = self._stream.seek(0, os.SEEK_END)
             self._stream.seek(cur_pos)
             return size
+
+    def close(self):
+        if hasattr(self._stream, "close"):
+            self._stream.close()