ObjectSync

ObjectSync is a communication framework designed for real-time applications, providing synchronization of state across a server and multiple clients. This README provides an overview of ObjectSync and its core concepts.

The ObjectSync client source code is at https://github.com/eri24816/ObjectSyncClient_ts

Lifecycle of SObject changed from v0.4.0

Introduction

ObjectSync enables real-time synchronization of state between a server and multiple clients. It achieves this by maintaining a hierarchy of SObjects, which represent synchronized objects. Each SObject contains several attributes that can be considered as variables or properties of the object.

When an SObject is created, it automatically appears on both the server and the clients, allowing seamless communication and synchronization. The attributes of the SObject can be accessed and modified by either the server code or the client code.

A common use case for ObjectSync is when representing a DOM element. An SObject can be used to represent a specific DOM element, and it can have an attribute called style that is bound to the element's style property. With ObjectSync, the server can modify the DOM element's style by simply modifying the style attribute in the server-side code, without the need to explicitly handle the communication between the server and the clients.

Installation

For Development

git clone git@github.com:eri24816/ObjectSync.git
cd ObjectSync
pip install -e .

For Application

Not available yet.

Get Started

Here is a minimal script to start the objectsync server:

import objectsync
import asyncio
server = objectsync.Server(port=8765)
asyncio.run(server.serve())

To create SObjects, you have to first define some subclasses of SObject.

For example:

class TextObject(ElementObject):

    frontend_type = 'text'

    def pre_build(self, _):
        # Set up style and text attributes to get control of the DOM element's style and text
        self.style = self.add_attribute('style', objectsync.DictTopic, {})
        self.text = self.add_attribute('text', objectsync.StringTopic, '')

The class's frontend_type property is 'text', which means when a TextObject is created, an SObject of 'text' type will spawn in the frontend. The frontend SObject types have to be defined in the separate frontend code (in TypeScript), which is out of scope here. Let's just assume the attributes style and text is bind to a DOM element's style and text properties.

Spawn a TextObject with server.create_object and modify the attributes a bit:

text = server.create_object(TextObject)
text.text.set('Hello ObjectSync!')
text.style.add('font-size','30px')
text.style.add('border','5px solid black')
text.style.add('background-color','yellow')

Then run the server.

asyncio.run(server.serve())

The result will look like this:

eri24816 / ObjectSync