Add flag for disabling object checksum generation

Checksums are calculated and added to the object's metadata as a way
to prevent double-uploading identical copies of large data. For some
use cases, such as uploading log files, there is no risk of that and
there is no point to paying the calculation cost.

Change-Id: I7b3c94b72e99f9abd3c961bd811da6fd563144bb

openstack/cloud/openstackcloud.py

@@ -7421,6 +7421,7 @@ class OpenStackCloud(_normalize.Normalizer):
             self, container, name, filename=None,
             md5=None, sha256=None, segment_size=None,
             use_slo=True, metadata=None,
+            generate_checksums=True,
             **headers):
         """Create a file object.
 
@@ -7445,6 +7446,9 @@ class OpenStackCloud(_normalize.Normalizer):
             Object, use a static rather than dynamic object. Static Objects
             will delete segment objects when the manifest object is deleted.
             (optional, defaults to True)
+        :param generate_checksums: Whether to generate checksums on the client
+            side that get added to headers for later prevention of double
+            uploads of identical data. (optional, defaults to True)
         :param metadata: This dict will get changed into headers that set
             metadata of the object
 
@@ -7463,9 +7467,11 @@ class OpenStackCloud(_normalize.Normalizer):
         segment_size = self.get_object_segment_size(segment_size)
         file_size = os.path.getsize(filename)
 
-        if not (md5 or sha256):
+        if generate_checksums and (md5 is None or sha256 is None):
             (md5, sha256) = self._get_file_hashes(filename)
+        if md5:
             headers[OBJECT_MD5_KEY] = md5 or ''
+        if sha256:
             headers[OBJECT_SHA256_KEY] = sha256 or ''
         for (k, v) in metadata.items():
             headers['x-object-meta-' + k] = v

openstack/tests/unit/cloud/test_object.py

@@ -895,3 +895,58 @@ class TestObjectUploads(BaseTestObject):
                 'etag': 'etag3',
             },
         ], self.adapter.request_history[-1].json())
+
+    def test_create_object_skip_checksum(self):
+
+        self.register_uris([
+            dict(method='GET',
+                 uri='https://object-store.example.com/info',
+                 json=dict(
+                     swift={'max_file_size': 1000},
+                     slo={'min_segment_size': 500})),
+            dict(method='HEAD',
+                 uri='{endpoint}/{container}'.format(
+                     endpoint=self.endpoint,
+                     container=self.container),
+                 status_code=404),
+            dict(method='PUT',
+                 uri='{endpoint}/{container}'.format(
+                     endpoint=self.endpoint, container=self.container),
+                 status_code=201,
+                 headers={
+                     'Date': 'Fri, 16 Dec 2016 18:21:20 GMT',
+                     'Content-Length': '0',
+                     'Content-Type': 'text/html; charset=UTF-8',
+                 }),
+            dict(method='HEAD',
+                 uri='{endpoint}/{container}'.format(
+                     endpoint=self.endpoint, container=self.container),
+                 headers={
+                     'Content-Length': '0',
+                     'X-Container-Object-Count': '0',
+                     'Accept-Ranges': 'bytes',
+                     'X-Storage-Policy': 'Policy-0',
+                     'Date': 'Fri, 16 Dec 2016 18:29:05 GMT',
+                     'X-Timestamp': '1481912480.41664',
+                     'X-Trans-Id': 'tx60ec128d9dbf44b9add68-0058543271dfw1',
+                     'X-Container-Bytes-Used': '0',
+                     'Content-Type': 'text/plain; charset=utf-8'}),
+            dict(method='HEAD',
+                 uri='{endpoint}/{container}/{object}'.format(
+                     endpoint=self.endpoint, container=self.container,
+                     object=self.object),
+                 status_code=200),
+            dict(method='PUT',
+                 uri='{endpoint}/{container}/{object}'.format(
+                     endpoint=self.endpoint,
+                     container=self.container, object=self.object),
+                 status_code=201,
+                 validate=dict(headers={})),
+        ])
+
+        self.cloud.create_object(
+            container=self.container, name=self.object,
+            filename=self.object_file.name,
+            generate_checksums=False)
+
+        self.assert_calls()

releasenotes/notes/object-checksum-generation-ea1c1e47d2290054.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - Add flag for disabling object checksum generation
+