FastWAPI is a simple lightweight Websocket framework based on Starlette, which provide easy-to-use Python decorator to parse JSON incoming message.

It's in the same spirit as FastAPI, where each decorator map to an HTTP path. But here, each decorator map to a Pydantic object, and each object map to a function.

pip install fastwapi

• The module is available, but far from finished & polished, please do not use it in production.

• Add authent middleware
• Add background job to asynchrounosly send JSON to the client

See example/main.py for complete code.

Getting started in three steps :

import uvicorn
from fastwapi import FastWAPI, WebSocket
from pydantic import BaseModel

app = FastWAPI(endpoint="/ws")

class CM(BaseModel):
    counter: int

class SD(BaseModel):
    name: str

@app.parse(CM)
async def parse_CM(websocket: WebSocket, data: CM):
    print("RECEIVED CM : ", data)
    await websocket.send_json(data.dict())

@app.parse(SD)
async def parse_SD(websocket: WebSocket, data: CM):
    print("RECEIVED SD : ", data)
    await websocket.send_json(data.dict())

Either through command line "uvicorn main:app" or directly inside the python file :

if __name__ == "__main__":
    uvicorn.run("main:app", port=5000, log_level="info")

To test your app, you need a websocket client. You can use Postman, or wscat :