def _transform_mobile_image(
self, original_image_blob: Blob, new_image_blob: Blob
) -> Optional[Blob]:
"""
Create smaller image size to be served on mobile devices.
:param Blob original_image_blob: Original image blob.
:param Blob new_image_blob: New newly created Blob for mobile image.
:returns: Optional[Blob]
"""
img_meta = self._get_image_meta(original_image_blob)
img_bytes = original_image_blob.download_as_bytes()
if img_bytes:
stream = BytesIO(img_bytes)
im = Image.open(stream)
try:
with BytesIO() as output:
new_image = im.reduce(2)
new_image.save(output, format=img_meta["format"])
new_image_blob.upload_from_string(
output.getvalue(), content_type=img_meta["content-type"]
)
LOGGER.success(f"Created mobile image `{new_image_blob.name}`")
return new_image_blob
except GoogleCloudError as e:
LOGGER.error(
f"GoogleCloudError while saving mobile image `{new_image_blob.name}`: {e}"
)
except Exception as e:
LOGGER.error(
f"Unexpected exception while saving mobile image `{new_image_blob.name}`: {e}"
)
