Use copyfileobj to save documents to files

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

HISTORY.rst

@@ -205,6 +205,7 @@
 * Enable list link icons.
 * Add outline links CSS for facets.
 * Add a bottom margin to list links.
+* Use copyfileobj to save documents to files
 
 3.1.11 (2019-04-XX)
 ===================

docs/releases/3.2.rst

@@ -237,6 +237,7 @@ Other changes
 * Enable list link icons.
 * Add outline links CSS for facets.
 * Add a bottom margin to list links.
+* Use copyfileobj to save documents to files
 
 Removals
 --------

mayan/apps/documents/models/document_version_models.py

@@ -3,6 +3,7 @@ from __future__ import absolute_import, unicode_literals
 import hashlib
 import logging
 import os
+import shutil
 import uuid
 
 from django.apps import apps
@@ -310,23 +311,13 @@ class DocumentVersion(models.Model):
                         sender=Document, instance=self.document
                     )
 
-    def save_to_file(self, filepath, buffer_size=1024 * 1024):
+    def save_to_file(self, file_object):
         """
         Save a copy of the document from the document storage backend
         to the local filesystem
         """
-        input_descriptor = self.open()
-        output_descriptor = open(filepath, 'wb')
-        while True:
-            copy_buffer = input_descriptor.read(buffer_size)
-            if copy_buffer:
-                output_descriptor.write(copy_buffer)
-            else:
-                break
-
-        output_descriptor.close()
-        input_descriptor.close()
-        return filepath
+        input_file_object = self.open()
+        shutil.copyfileobj(fsrc=input_file_object, fdst=file_object)
 
     @property
     def size(self):

mayan/apps/file_metadata/drivers/exiftool.py

@@ -13,7 +13,7 @@ except ImportError:
 
 from django.utils.translation import ugettext_lazy as _
 
-from mayan.apps.storage.utils import fs_cleanup, mkstemp
+from mayan.apps.storage.utils import NamedTemporaryFile
 
 from ..literals import DEFAULT_EXIF_PATH
 from ..classes import FileMetadataDriver
@@ -44,15 +44,15 @@ class EXIFToolDriver(FileMetadataDriver):
 
     def _process(self, document_version):
         if self.command_exiftool:
-            new_file_object, temp_filename = mkstemp()
+            temporary_fileobject = NamedTemporaryFile()
 
             try:
-                document_version.save_to_file(filepath=temp_filename)
-                result = self.command_exiftool(temp_filename)
+                document_version.save_to_file(file_object=temporary_fileobject)
+                result = self.command_exiftool(temporary_fileobject.name)
 
                 return json.loads(s=result.stdout)[0]
             finally:
-                fs_cleanup(filename=temp_filename)
+                temporary_fileobject.close()
         else:
             logger.warning(
                 'EXIFTool binary not found, not processing document '