fix(itkwasm): convert metadata dict to json array

Author: thewtex

packages/core/python/itkwasm/itkwasm/pipeline.py

@@ -235,13 +235,18 @@ def run(
                 data_ptr = ri.set_input_array(mv, index, 0)
                 dv = array_like_to_bytes(image.direction)
                 direction_ptr = ri.set_input_array(dv, index, 1)
+                metadata = []
+                if image.metadata:
+                    for key, value in image.metadata.items():
+                        metadata.append((key, value))
                 image_json = {
                     "imageType": asdict(image.imageType),
                     "name": image.name,
                     "origin": image.origin,
                     "spacing": image.spacing,
                     "direction": f"data:application/vnd.itk.address,0:{direction_ptr}",
                     "size": image.size,
+                    "metadata": metadata,
                     "data": f"data:application/vnd.itk.address,0:{data_ptr}",
                 }
                 ri.set_input_json(image_json, index)
@@ -427,6 +432,12 @@ def run(
                 elif output.type == InterfaceTypes.Image:
                     image_json = ri.get_output_json(index)
 
+                    if 'metadata' in image_json and isinstance(image_json['metadata'], list):
+                        metadata = image_json['metadata']
+                        image_json['metadata'] = {}
+                        for key, value in metadata:
+                            image_json['metadata'][key] = value
+
                     image = Image(**image_json)
 
                     data_ptr = ri.get_output_array_address(0, index, 0)