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Represents a folder item in a file system hierarchy, extending the Item base class with the ability to contain children and be uploaded as a ZIP archive.

Purpose

The Folder class models a directory/folder in what appears to be a reMarkable tablet file system. It maintains a collection of child items and provides functionality to upload the folder as a ZIP file containing metadata. The upload method creates an empty content file within the ZIP archive, suggesting this is part of a document management system where folders need to be synchronized or uploaded to a remote service.

Source Code

class Folder(Item):

    def __init__(self, metadata):
        super().__init__(metadata)
        self.children = []

    @add_sync
    async def upload(self):
        f = io.BytesIO()
        with zipfile.ZipFile(f, 'w', zipfile.ZIP_DEFLATED) as zf:
            zf.writestr(f'{self.id}.content', '')
        f.seek(0)

        return await self.upload_raw(f)

Parameters

Parameter Details

metadata: A dictionary or object containing metadata information about the folder. This is passed to the parent Item class constructor and likely includes properties such as folder ID, name, parent folder reference, creation/modification timestamps, and other folder-specific attributes required by the Item base class.

Return Value

The Folder constructor returns a new Folder instance. The upload() method returns the result of upload_raw(f), which is likely a response object or status from uploading the ZIP file to a remote service. Since upload() is an async method decorated with @add_sync, it can be called both synchronously and asynchronously.

Class Interface

Methods

Attributes

Dependencies

• io
• zipfile
• trio
• functools

Required Imports

import io
import zipfile
from sync import add_sync

Usage Example

# Assuming Item base class and necessary imports are available
metadata = {
    'id': 'folder-123',
    'name': 'My Documents',
    'parent': 'root',
    'type': 'CollectionType'
}

# Create a folder instance
folder = Folder(metadata)

# Add children to the folder
folder.children.append(child_item1)
folder.children.append(child_item2)

# Upload the folder (async)
import trio
async def main():
    result = await folder.upload()
    print(f'Upload result: {result}')

trio.run(main)

# Or use synchronously (if @add_sync decorator provides sync version)
result = folder.upload()
print(f'Upload result: {result}')

Best Practices

• Always initialize the Folder with proper metadata that includes at minimum an 'id' field, as this is used in the upload() method
• The children list should be populated with Item or Item-subclass instances to maintain the folder hierarchy
• The upload() method is async and should be awaited when called in async contexts, or called directly if the @add_sync decorator provides a synchronous wrapper
• The upload() method creates an in-memory ZIP file, so be mindful of memory usage for folders with many children or large metadata
• Ensure the parent Item class's upload_raw() method is properly implemented before calling upload()
• The ZIP file created contains an empty content file named '{id}.content', suggesting this is a placeholder for folder representation in the storage system
• Do not modify the children list during iteration without proper safeguards to avoid concurrent modification issues
• The Folder instance maintains state through the children list, so be careful with shared references

Tags

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