1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465
import { serve } from "https://deno.land/std@0.96.0/http/server.ts";import {  acceptWebSocket,  isWebSocketCloseEvent,  isWebSocketPingEvent,  WebSocket,} from "https://deno.land/std@0.96.0/ws/mod.ts";
async function handleWs(sock: WebSocket, eventtarget: EventTarget) {  console.log("socket connected!");  const handler = async () => {    console.log("got reload event!");    if (!sock.isClosed) {      await sock.send(JSON.stringify({ type: "reload" }));      sock.close(1000).catch(console.error);    }    eventtarget.removeEventListener("reload", handler);  };  eventtarget.addEventListener("reload", handler);  try {    for await (const ev of sock) {      if (typeof ev === "string") {        // text message.        console.log("ws:Text", ev);        await sock.send(ev);      } else if (ev instanceof Uint8Array) {        // binary message.        console.log("ws:Binary", ev);      } else if (isWebSocketPingEvent(ev)) {        const [, body] = ev;        // ping.        console.log("ws:Ping", body);      } else if (isWebSocketCloseEvent(ev)) {        // close.        const { code, reason } = ev;        console.log("ws:Close", code, reason);      }    }  } catch (err) {    console.error(`failed to receive frame: ${err}`);
    if (!sock.isClosed) {      await sock.close(1000).catch(console.error);    }  }}
export async function livereloadServer(port = 35729, eventtarget: EventTarget) {  console.log(`livereload websocket server is running on port=${port}`);  for await (const req of serve(`:${port}`)) {    const { conn, r: bufReader, w: bufWriter, headers } = req;    acceptWebSocket({      conn,      bufReader,      bufWriter,      headers,    })      .then((ws) => handleWs(ws, eventtarget))      .catch(async (err) => {        console.error(`failed to accept websocket: ${err}`);        await req.respond({ status: 400 });      });  }}