Add an option to record file content size

rocrate/model/file.py

@@ -45,7 +45,10 @@ def write(self, base_path):
             out_file_path.parent.mkdir(parents=True, exist_ok=True)
             mode = 'w' + ('b' if isinstance(self.source, BytesIO) else 't')
             with open(out_file_path, mode) as out_file:
-                out_file.write(self.source.getvalue())
+                content = self.source.getvalue()
+                out_file.write(content)
+                if self.record_size:
+                    self._jsonld['contentSize'] = str(len(content))
         elif is_url(str(self.source)):
             if self.fetch_remote or self.validate_url:
                 if self.validate_url:
@@ -62,10 +65,14 @@ def write(self, base_path):
                     out_file_path.parent.mkdir(parents=True, exist_ok=True)
                     urllib.request.urlretrieve(self.source, out_file_path)
                     self._jsonld['contentUrl'] = str(self.source)
+                    if self.record_size:
+                        self._jsonld['contentSize'] = str(out_file_path.stat().st_size)
         elif self.source is None:
             # Allows to record a File entity whose @id does not exist, see #73
             warnings.warn(f"No source for {self.id}")
         else:
             out_file_path.parent.mkdir(parents=True, exist_ok=True)
             if not out_file_path.exists() or not out_file_path.samefile(self.source):
                 shutil.copy(self.source, out_file_path)
+            if self.record_size:
+                self._jsonld['contentSize'] = str(out_file_path.stat().st_size)

rocrate/model/file_or_dir.py

@@ -29,11 +29,12 @@
 class FileOrDir(DataEntity):
 
     def __init__(self, crate, source=None, dest_path=None, fetch_remote=False,
-                 validate_url=False, properties=None):
+                 validate_url=False, properties=None, record_size=False):
         if properties is None:
             properties = {}
         self.fetch_remote = fetch_remote
         self.validate_url = validate_url
+        self.record_size = record_size
         self.source = source
         if dest_path:
             dest_path = Path(dest_path)

rocrate/rocrate.py

@@ -342,15 +342,17 @@ def add_file(
             dest_path=None,
             fetch_remote=False,
             validate_url=False,
-            properties=None
+            properties=None,
+            record_size=False
     ):
         return self.add(File(
             self,
             source=source,
             dest_path=dest_path,
             fetch_remote=fetch_remote,
             validate_url=validate_url,
-            properties=properties
+            properties=properties,
+            record_size=record_size
         ))
 
     def add_dataset(
@@ -478,11 +480,12 @@ def write_zip(self, out_path):
 
     def add_workflow(
             self, source=None, dest_path=None, fetch_remote=False, validate_url=False, properties=None,
-            main=False, lang="cwl", lang_version=None, gen_cwl=False, cls=ComputationalWorkflow
+            main=False, lang="cwl", lang_version=None, gen_cwl=False, cls=ComputationalWorkflow,
+            record_size=False
     ):
         workflow = self.add(cls(
             self, source=source, dest_path=dest_path, fetch_remote=fetch_remote,
-            validate_url=validate_url, properties=properties
+            validate_url=validate_url, properties=properties, record_size=record_size
         ))
         if isinstance(lang, ComputerLanguage):
             assert lang.crate is self
@@ -503,7 +506,7 @@ def add_workflow(
             cwl_dest_path = Path(source).with_suffix(".cwl").name
             cwl_workflow = self.add_workflow(
                 source=cwl_source, dest_path=cwl_dest_path, fetch_remote=fetch_remote, properties=properties,
-                main=False, lang="cwl", gen_cwl=False, cls=WorkflowDescription
+                main=False, lang="cwl", gen_cwl=False, cls=WorkflowDescription, record_size=record_size
             )
             workflow.subjectOf = cwl_workflow
         return workflow
@@ -542,12 +545,12 @@ def add_test_instance(self, suite, url, resource="", service="jenkins", identifi
 
     def add_test_definition(
             self, suite, source=None, dest_path=None, fetch_remote=False, validate_url=False, properties=None,
-            engine="planemo", engine_version=None
+            engine="planemo", engine_version=None, record_size=False
     ):
         suite = self.__validate_suite(suite)
         definition = self.add(
             TestDefinition(self, source=source, dest_path=dest_path, fetch_remote=fetch_remote,
-                           validate_url=validate_url, properties=properties)
+                           validate_url=validate_url, properties=properties, record_size=record_size)
         )
         if isinstance(engine, SoftwareApplication):
             assert engine.crate is self

test/test_write.py

@@ -49,7 +49,7 @@ def test_file_writing(test_data_dir, tmpdir, helpers, gen_preview, to_zip):
     file_subdir_id = 'sample_file_subdir.txt'
 
     sample_file = test_data_dir / sample_file_id
-    file_returned = crate.add_file(sample_file)
+    file_returned = crate.add_file(sample_file, record_size=True)
     assert file_returned.id == sample_file_id
     file_returned_subdir = crate.add_file(sample_file, sample_file2_id)
     assert file_returned_subdir.id == sample_file2_id
@@ -99,15 +99,17 @@ def test_file_writing(test_data_dir, tmpdir, helpers, gen_preview, to_zip):
     assert json_entities[formatted_creator_id]["name"] == creator_name
     if gen_preview:
         assert helpers.PREVIEW_FILE_NAME in json_entities
+    file_entity = json_entities[sample_file_id]
+    assert file_entity["contentSize"] == str(file1.stat().st_size)
 
 
 @pytest.mark.parametrize("stream_cls", [io.BytesIO, io.StringIO])
 def test_in_mem_stream(stream_cls, tmpdir, helpers):
     crate = ROCrate()
 
     test_file_id = 'a/b/test_file.txt'
-    file_content = b'\x00\x01' if stream_cls is io.BytesIO else 'foo\n'
-    file_returned = crate.add_file(stream_cls(file_content), test_file_id)
+    file_content = b'\x00\x01\x02' if stream_cls is io.BytesIO else 'foo'
+    file_returned = crate.add_file(stream_cls(file_content), test_file_id, record_size=True)
     assert file_returned.id == test_file_id
 
     out_path = tmpdir / 'ro_crate_out'
@@ -121,6 +123,9 @@ def test_in_mem_stream(stream_cls, tmpdir, helpers):
     mode = 'r' + ('b' if stream_cls is io.BytesIO else 't')
     with open(file1, mode) as f:
         assert f.read() == file_content
+    json_entities = helpers.read_json_entities(out_path)
+    file_entity = json_entities[test_file_id]
+    assert file_entity['contentSize'] == '3'
 
 
 @pytest.mark.parametrize(
@@ -132,7 +137,11 @@ def test_remote_uri(tmpdir, helpers, fetch_remote, validate_url, to_zip):
     url = ('https://raw.githubusercontent.com/ResearchObject/ro-crate-py/'
            'master/test/test-data/sample_file.txt')
     relpath = "a/b/sample_file.txt"
-    kw = {"fetch_remote": fetch_remote, "validate_url": validate_url}
+    kw = {
+        "fetch_remote": fetch_remote,
+        "validate_url": validate_url,
+        "record_size": True,
+    }
     if fetch_remote:
         file_ = crate.add_file(url, relpath, **kw)
         assert file_.id == relpath
@@ -154,6 +163,7 @@ def test_remote_uri(tmpdir, helpers, fetch_remote, validate_url, to_zip):
         out_file = out_crate.dereference(file_.id)
         assert (out_path / relpath).is_file()
         assert out_file["contentUrl"] == url
+        assert out_file["contentSize"] == str((out_path / file_.id).stat().st_size)
     else:
         out_file = out_crate.dereference(url)
         assert not (out_path / relpath).exists()