y_sweet_sdk

Usage

from y_sweet_sdk import DocumentManager

# Get the websocket url for a document.
doc = DocumentManager('ys://localhost:8080')
url = doc.get_websocket_url('my-document-id')

# Connect to the document using y_py and ypy_websocket.
# (Based on: https://davidbrochart.github.io/ypy-websocket/usage/client/)
from ypy_websocket import WebsocketProvider
import y_py as Y
from websockets import connect
import asyncio

ydoc = Y.YDoc()

# Simple example: log the array "todolist" to stdout every time it changes.
data = ydoc.get_array("todolist")
def data_changed(event: Y.AfterTransactionEvent):
    print(f"data changed: {data.to_json()}")

data.observe_deep(data_changed)

async with (
    connect(url) as websocket,
    WebsocketProvider(ydoc, websocket),
):
    await asyncio.Future()  # run forever

y_sweet_sdk is only used to talk directly with the Y-Sweet server to obtain a WebSocket URL to pass to a client. Use a Yjs client like ypy-websocket or pycrdt in conjunction with y_sweet_sdk to access the actual Y.Doc data.

Developing

Developing y_sweet_sdk requires the uv project manager.

To install it on Mac or Liunux, run:

curl -LsSf https://astral.sh/uv/install.sh | sh

(See the docs for other platforms and more information.)

When using uv, you do not need to manage a virtual environment yourself. Instead, you interact with Python using the uv command, which automatically picks up the virtual environment from the location.

To set up the virtual environment for development, run:

uv sync --dev

This installs both the regular dependencies and the development dependencies.

Tests

Once commands are installed in your virtual environment, you can run them with uv run.

To run tests, run:

uv run pytest

This runs the pytest command in the virtual environment.

Formatting

Run uv run ruff format to format before committing changes.