Python - websocket.send()

Send a message to a connected websocket client.

from nitric.resources import websocket
from nitric.application import Nitric

public_websocket = websocket("public")

async def send_hello_message(connection_id: string):
    await public_websocket.send(connection_id, b"Hello")

Nitric.run()

Parameters

Name
connection_id
Required
Required
Type
string
Description
The ID of the connection to send the message to on this websocket.
Name
data
Required
Required
Type
bytes
Description
The byte data to send to that connection

Do not send messages to a connection during it's connect callback, if you need to acknowledge connection, do so by using a topic

Examples

Broadcast messages to all connected clients

from nitric.resources import api, websocket, collection
from nitric.application import Nitric
from nitric.faas import WebsocketContext

connections = collection("connections").allow("reading", "writing", "deleting")
main_websocket = websocket("main")

@main_websocket.on("connect")
async def connect(ctx: WebsocketContext):
    await connections.doc(ctx.req.connection_id).set({})

@main_websocket.on("disconnect")
async def disconnect(ctx: WebsocketContext):
    await connections.doc(ctx.req.connection_id).delete()

@main_websocket.on("message")
async def message(ctx: WebsocketContext):
    all = connections.query().stream()

    async for conn in all:
        await main_websocket.send(conn.id, ctx.req.data)