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import React, { useEffect, useState } from "react";
import { RootStore } from "../redux/store";
import { useSelector } from "react-redux";
import { postVscMessage } from "../vscode";
abstract class Messenger {
abstract send(data: string): void;
}
class VscodeMessenger extends Messenger {
url: string;
constructor(
url: string,
onMessage: (message: { data: any }) => void,
onOpen: (messenger: Messenger) => void,
onClose: (messenger: Messenger) => void
) {
super();
this.url = url;
window.addEventListener("message", (event: any) => {
switch (event.data.type) {
case "websocketForwardingMessage":
onMessage(event.data);
break;
case "websocketForwardingOpen":
onOpen(this);
break;
case "websocketForwardingClose":
onClose(this);
break;
}
});
postVscMessage("websocketForwardingOpen", { url: this.url });
}
send(data: string) {
postVscMessage("websocketForwardingMessage", {
message: data,
url: this.url,
});
}
}
class WebsocketMessenger extends Messenger {
websocket: WebSocket;
constructor(
websocket: WebSocket,
onMessage: (message: { data: any }) => void,
onOpen: (messenger: Messenger) => void,
onClose: (messenger: Messenger) => void
) {
super();
this.websocket = websocket;
websocket.addEventListener("close", () => {
onClose(this);
});
websocket.addEventListener("open", () => {
onOpen(this);
});
websocket.addEventListener("message", (event) => {
onMessage(event.data);
});
}
static async connect(
url: string,
sessionId: string,
onMessage: (message: { data: any }) => void,
onOpen: (messenger: Messenger) => void,
onClose: (messenger: Messenger) => void
): Promise<WebsocketMessenger> {
const ws = new WebSocket(url);
return new Promise((resolve, reject) => {
ws.addEventListener("open", () => {
resolve(new WebsocketMessenger(ws, onMessage, onOpen, onClose));
});
});
}
send(data: string) {
this.websocket.send(JSON.stringify(data));
}
}
function useContinueWebsocket(
serverUrl: string,
onMessage: (message: { data: any }) => void,
useVscodeMessagePassing: boolean = true
) {
const sessionId = useSelector((state: RootStore) => state.config.sessionId);
const [websocket, setWebsocket] = useState<Messenger | undefined>(undefined);
async function connect() {
while (!sessionId) {
await new Promise((resolve) => setTimeout(resolve, 300));
}
console.log("Creating websocket", sessionId);
console.log("Using vscode message passing", useVscodeMessagePassing);
const onClose = (messenger: Messenger) => {
console.log("Websocket closed");
setWebsocket(undefined);
};
const onOpen = (messenger: Messenger) => {
console.log("Websocket opened");
messenger.send(JSON.stringify({ sessionId }));
};
const url =
serverUrl.replace("http", "ws") +
"/notebook/ws?session_id=" +
encodeURIComponent(sessionId);
const messenger: Messenger = useVscodeMessagePassing
? new VscodeMessenger(url, onMessage, onOpen, onClose)
: await WebsocketMessenger.connect(
url,
sessionId,
onMessage,
onOpen,
onClose
);
setWebsocket(messenger);
return messenger;
}
async function getConnection() {
if (!websocket) {
return await connect();
}
return websocket;
}
async function send(message: object) {
let ws = await getConnection();
ws.send(JSON.stringify(message));
}
useEffect(() => {
if (!sessionId) {
return;
}
connect();
}, [sessionId]);
return { send };
}
export default useContinueWebsocket;
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