Allow server-side components to send messages to client-side components

Abierto
#975 4 comentarios 0 reacciones 0 asignados Ver en GitHub

Nadie ha tomado este issue todavía.

Evaluación

Dificultad
5/5
Tiempo estimado
Más de una semana
Aptitud para principiantes
25/100
Tipo de issue
Nueva funcionalidad
Claridad
Necesita aclaración
Estado de actividad
Estancado
Stack tecnológico
javascript, python
Área
full-stack

Línea de trabajo

Start with the callback registration in src/client/packages/@reactpy/client/src/reactpy-vdom.tsx and trace the existing client-to-server event path. The issue still needs an agreed interface for targets or channels before implementation. Done means server-side components can deliver messages to the intended custom client-side component and the contract is documented and tested.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

priority-1-high release-minor
Current Situation

Presently, custom client-side components are able to send events back to the server. However, it is not possible to send events from server-side components to client-side ones.

Proposed Actions

Now that custom JS components have the ability to register callbacks with the client this should be technologically feasible. With that said, while users can listen in on particular message types, there is no concept of a message "target". We could achieve this by having message types of the form server-event:<the-target>, but this seems like a bit of a hack. Perhaps we can allow (require?) a nullable target field for this purpose.

Before diving into all those details though, we need to work out exactly what this interface should look like.

I can imagine having an interface similar to:

@component
def example():
    channel = use_channel()

    @use_effect
    async def delayed_message():
        import asyncio
        await asyncio.sleep(5)
        await channel.send({"my": "message"})
        response = await channel.receive()

    return custom_js_component({"channel_id": channel.id})

where custom_js_component would then subscribe to messages of the type channel-message and target channel.id.

Lenguaje dominante
Python
Estrellas
8.1k
Forks
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