121 lines
3.9 KiB
Python
121 lines
3.9 KiB
Python
from fastapi import APIRouter, FastAPI, WebSocket, WebSocketDisconnect
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from fastapi.responses import HTMLResponse
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from typing import List
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import aioredis, asyncio, json
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from ..lib_general import *
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from ..log import *
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from app.config import settings
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from app.db_sql import *
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router = APIRouter()
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html = """
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<!DOCTYPE html>
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<html>
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<head>
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<title>Chat</title>
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</head>
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<body>
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<h1>WebSocket Chat</h1>
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<h2>Your ID: <span id="ws-id"></span></h2>
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<form action="" onsubmit="sendMessage(event)">
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<input type="text" id="messageText" autocomplete="off"/>
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<button>Send</button>
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</form>
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<ul id='messages'>
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</ul>
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<script>
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var client_id = Date.now()
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document.querySelector("#ws-id").textContent = client_id;
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//var ws = new WebSocket(`ws://localhost:5005/ws/${client_id}`);
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var ws = new WebSocket("ws://localhost:8000/ws");
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//var ws = new WebSocket("ws://fastapi.localhost/ws");
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ws.onmessage = function(event) {
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var messages = document.getElementById('messages')
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var message = document.createElement('li')
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var content = document.createTextNode(event.data)
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message.appendChild(content)
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messages.appendChild(message)
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};
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function sendMessage(event) {
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var input = document.getElementById("messageText")
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var data = { 'client_id': client_id, 'message': input.value };
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var data_json_str = JSON.stringify(data);
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ws.send(data_json_str);
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//ws.send(input.value)
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input.value = ''
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event.preventDefault()
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}
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</script>
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</body>
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</html>
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"""
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@router.get("/ws_test")
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async def get():
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log.setLevel(logging.DEBUG)
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log.debug(locals())
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return HTMLResponse(html)
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@router.websocket("/ws")
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async def websocket_endpoint(websocket: WebSocket):
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log.setLevel(logging.DEBUG)
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log.debug(locals())
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log.info('Root of ws. Waiting to accept a websocket and then the redis_connector')
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await websocket.accept()
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await redis_connector(websocket)
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async def redis_connector(
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websocket: WebSocket, redis_uri: str = "redis://localhost:6379"
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):
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log.setLevel(logging.DEBUG)
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log.debug(locals())
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async def consumer_handler(ws: WebSocket, r):
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try:
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while True:
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message = await ws.receive_text()
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if message:
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#logging.info(ws)
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#logging.info(dir(message))
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data = json.loads(message)
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#await r.publish("chat:c", message)
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#await r.publish("chat:c", str(data['message']))
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await r.publish("chat:c", str(data['client_id']))
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await r.publish("chat:c", str(data))
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except WebSocketDisconnect as exc:
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# TODO this needs handling better
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log.error(exc)
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async def producer_handler(r, ws: WebSocket):
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(channel,) = await r.subscribe("chat:c")
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assert isinstance(channel, aioredis.Channel)
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try:
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while True:
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message = await channel.get()
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if message:
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await ws.send_text(message.decode("utf-8"))
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except Exception as exc:
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# TODO this needs handling better
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log.error(exc)
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redis = await aioredis.create_redis_pool(redis_uri)
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consumer_task = consumer_handler(websocket, redis)
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producer_task = producer_handler(redis, websocket)
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done, pending = await asyncio.wait(
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[consumer_task, producer_task], return_when=asyncio.FIRST_COMPLETED,
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)
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log.debug(f"Done task: {done}")
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for task in pending:
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log.debug(f"Canceling task: {task}")
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task.cancel()
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redis.close()
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await redis.wait_closed()
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