feat(Python): Pyodide BinaryFile support

packages/core/python/itkwasm/itkwasm/pyodide.py

@@ -122,6 +122,10 @@ def to_py(js_proxy):
         if polydata_dict['cellData'] is not None:
             polydata_dict['cellData'] = _to_numpy_array(cell_pixel_component_type, polydata_dict['cellData'])
         return PolyData(**polydata_dict)
+    elif hasattr(js_proxy, "path") and hasattr(js_proxy, "data"):
+        with open(js_proxy.path, 'wb') as fp:
+            js_proxy.data.to_file(fp)
+        return BinaryFile(path=js_proxy.path)
     elif hasattr(js_proxy, "data") and isinstance(js_proxy.data, str):
         text_stream_dict = js_proxy.to_py()
         return TextStream(**text_stream_dict)
@@ -182,5 +186,11 @@ def to_js(py):
     elif isinstance(py, BinaryStream):
         binary_stream_dict = asdict(py)
         return pyodide.ffi.to_js(binary_stream_dict, dict_converter=js.Object.fromEntries)
+    elif isinstance(py, BinaryFile):
+        binary_file_dict = asdict(py)
+        with open(py.path, 'rb') as fp:
+            data = fp.read()
+        binary_file_dict['data'] = data
+        return pyodide.ffi.to_js(binary_file_dict, dict_converter=js.Object.fromEntries)
 
     return pyodide.ffi.to_js(py)

packages/core/python/itkwasm/test/test_pyodide.py

@@ -168,7 +168,6 @@ async def test_binary_stream_conversion(selenium, package_wheel):
 
     from itkwasm import BinaryStream
     from itkwasm.pyodide import to_js, to_py
-    import numpy as np
 
     data = bytes([222,173,190,239])
     binary_stream = BinaryStream(data)
@@ -188,12 +187,38 @@ async def test_text_stream_conversion(selenium, package_wheel):
 
     from itkwasm import TextStream
     from itkwasm.pyodide import to_js, to_py
-    import numpy as np
 
     data = "The answer is 42."
     text_stream = TextStream(data)
 
     text_stream_js = to_js(text_stream)
     text_stream_py = to_py(text_stream_js)
 
-    assert text_stream_py.data == data
+    assert text_stream_py.data == data
+
+@run_in_pyodide(packages=['micropip', 'numpy'])
+async def test_binary_file_conversion(selenium, package_wheel):
+    import micropip
+    await micropip.install(package_wheel)
+
+    from itkwasm import BinaryFile
+    from itkwasm.pyodide import to_js, to_py
+    import numpy as np
+    from pathlib import PurePosixPath
+
+    data = bytes([222,173,190,239])
+    path = PurePosixPath('file.bin')
+    with open(path, 'wb') as fp:
+        fp.write(data)
+    binary_file = BinaryFile(path)
+
+    binary_file_js = to_js(binary_file)
+    binary_file_py = to_py(binary_file_js)
+
+    with open(binary_file_py.path, 'rb') as fp:
+        data_py = fp.read()
+
+    assert data_py[0], 222
+    assert data_py[1], 173
+    assert data_py[2], 190
+    assert data_py[3], 239