Вызывают обе стороны.

import random

from aiohttp import web
from wsrpc_aiohttp import STATIC_DIR, Route, WebSocketAsync, decorators

QUOTES = [
    ("HAL 9000", "I'm sorry, Dave. I'm afraid I can't do that."),
    ("The Oracle", "There is no spoon."),
    ("T-800", "I'll be back."),
]


class Socket(WebSocketAsync):
    pass


class Chat(Route[Socket]):
    @decorators.proxy
    async def send(self, *, text: str) -> dict:
        # Draw the line in the page that called, and wait for its answer.
        await self.socket.proxy.chat.append(text=text, mine=True)

        sender, reply = random.choice(QUOTES)
        await self.socket.proxy.chat.append(sender=sender, text=reply)
        return {"delivered": True}


def create_app() -> web.Application:
    Socket.add_route("chat", Chat)
    app = web.Application()
    app.router.add_get("/ws/", Socket)
    app.router.add_static("/js/", STATIC_DIR)
    return app


if __name__ == "__main__":
    web.run_app(create_app(), host="127.0.0.1", port=8000)

import random

from fastapi import FastAPI, WebSocket
from wsrpc_asgi import Route, WebSocketAsync, decorators

QUOTES = [
    ("HAL 9000", "I'm sorry, Dave. I'm afraid I can't do that."),
    ("The Oracle", "There is no spoon."),
    ("T-800", "I'll be back."),
]


class RPC(WebSocketAsync):
    pass


class Chat(Route[RPC]):
    @decorators.proxy
    async def send(self, *, text: str) -> dict:
        # Draw the line in the page that called, and wait for its answer.
        await self.socket.proxy.chat.append(text=text, mine=True)

        sender, reply = random.choice(QUOTES)
        await self.socket.proxy.chat.append(sender=sender, text=reply)
        return {"delivered": True}


RPC.add_route("chat", Chat)
app = FastAPI()


@app.websocket("/ws/")
async def rpc(websocket: WebSocket) -> None:
    await RPC.serve(websocket)

package main

import (
	"context"
	"log"
	"math/rand/v2"
	"net/http"

	wsrpc "github.com/wsrpc/wsrpc-go"
	"github.com/wsrpc/wsrpc-go/ws"
)

type Line struct {
	Sender string `json:"sender,omitempty"`
	Text   string `json:"text"`
	Mine   bool   `json:"mine,omitempty"`
}

type Sent struct {
	Text string `json:"text"`
}

type Delivered struct {
	Delivered bool `json:"delivered"`
}

type Seen struct {
	Seen bool `json:"seen"`
}

var quotes = []Line{
	{Sender: "HAL 9000", Text: "I'm sorry, Dave. I'm afraid I can't do that."},
	{Sender: "The Oracle", Text: "There is no spoon."},
	{Sender: "T-800", Text: "I'll be back."},
}

type Chat struct{}

// Draw the line in the page that called, and wait for its answer.
func (Chat) Send(ctx context.Context, p Sent) (Delivered, error) {
	peer, _ := wsrpc.FromContext(ctx)

	if _, err := peer.Call[Seen](ctx, "chat.append", Line{Text: p.Text, Mine: true}); err != nil {
		return Delivered{}, err
	}

	reply := quotes[rand.IntN(len(quotes))]
	if _, err := peer.Call[Seen](ctx, "chat.append", reply); err != nil {
		return Delivered{}, err
	}

	return Delivered{Delivered: true}, nil
}

func main() {
	routes := new(wsrpc.Router)
	if err := routes.Handle("chat.send", Chat{}.Send); err != nil {
		log.Fatal(err)
	}

	rpc, err := ws.NewServer(ws.ServerOptions{Peer: wsrpc.Options{Routes: routes}})
	if err != nil {
		log.Fatal(err)
	}

	mux := http.NewServeMux()
	mux.Handle("/ws/", rpc)
	log.Fatal(http.ListenAndServe("127.0.0.1:8000", mux))
}

import asyncio

from wsrpc_aiohttp import Route, WSRPCClient, decorators


class Chat(Route):
    @decorators.proxy
    def append(self, *, text: str, sender: str = "you", mine: bool = False) -> dict:
        # The server calls this method. Draw the line and confirm it.
        print(f"{sender}: {text}")
        return {"seen": True}


async def main() -> None:
    client = WSRPCClient("http://127.0.0.1:8000/ws/")

    # Register the route before the connection opens.
    client.add_route("chat", Chat)

    async with client:
        print(await client.proxy.chat.send(text="Hello"))
        await asyncio.sleep(1)


if __name__ == "__main__":
    asyncio.run(main())

import WSRPC from "@wsrpc/client";

interface Line {
  sender?: string;
  text: string;
  mine?: boolean;
}

const chat = document.getElementById("chat") as HTMLElement;
const rpc = new WSRPC("/ws/");

// The server calls this route. The page draws what it gets.
rpc.addRoute("chat.append", (line: Line) => {
  const row = document.createElement("p");
  row.textContent = `${line.sender ?? "you"}: ${line.text}`;
  chat.append(row);
  return { seen: true };
});

rpc.connect();

export async function say(text: string): Promise<void> {
  await rpc.call<{ delivered: boolean }>("chat.send", { text });
}

// The package ships wsrpc.d.ts. Map it onto the module name once.
declare module "@wsrpc/client" {
  export default class WSRPC {
    constructor(url: string, reconnectTimeout?: number);
    connect(): void;
    destroy(): void;
    state(): "CONNECTING" | "OPEN" | "CLOSING" | "CLOSED";
    call<T>(method: string, params?: object): Promise<T>;
    addRoute(
      route: string,
      handler: (params: never) => unknown,
      isAsync?: boolean,
    ): void;
  }
}

<form id="say"><input name="text" autocomplete="off"></form>
<div id="chat"></div>

<script src="/js/wsrpc.min.js"></script>
<script>
  const rpc = new WSRPC("/ws/");

  // The server calls this route. The page draws what it gets.
  rpc.addRoute("chat.append", function (line) {
    const row = document.createElement("p");
    row.textContent = (line.sender || "you") + ": " + line.text;
    document.getElementById("chat").append(row);
    return {seen: true};
  });

  rpc.connect();

  document.getElementById("say").addEventListener("submit", function (event) {
    event.preventDefault();
    rpc.proxy.chat.send({text: event.target.text.value});
    event.target.reset();
  });
</script>