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<!DOCTYPE html>
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<html>
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<head>
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<title>Browser Dialer</title>
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</head>
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<body>
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<script>
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"use strict";
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// Enable a much more aggressive JIT for performance gains
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// Copyright (c) 2021 XRAY. Mozilla Public License 2.0.
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let url = "ws://" + window.location.host + "/websocket?token=csrfToken";
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let clientIdleCount = 0;
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let upstreamGetCount = 0;
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let upstreamWsCount = 0;
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let upstreamPostCount = 0;
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let check = function () {
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if (clientIdleCount > 0) {
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return;
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};
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clientIdleCount += 1;
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console.log("Prepare", url);
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let ws = new WebSocket(url);
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// arraybuffer is significantly faster in chrome than default
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// blob, tested with chrome 123
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ws.binaryType = "arraybuffer";
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// note: this event listener is later overwritten after the
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// handshake has completed. do not attempt to modernize it without
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// double-checking that this continues to work
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ws.onmessage = function (event) {
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clientIdleCount -= 1;
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let [method, url, protocol] = event.data.split(" ");
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switch (method) {
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case "WS": {
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upstreamWsCount += 1;
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console.log("Dial WS", url, protocol);
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const wss = new WebSocket(url, protocol);
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wss.binaryType = "arraybuffer";
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let opened = false;
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ws.onmessage = function (event) {
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wss.send(event.data)
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};
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wss.onopen = function (event) {
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opened = true;
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ws.send("ok")
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};
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wss.onmessage = function (event) {
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ws.send(event.data)
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};
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wss.onclose = function (event) {
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upstreamWsCount -= 1;
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console.log("Dial WS DONE, remaining: ", upstreamWsCount);
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ws.close()
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};
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wss.onerror = function (event) {
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!opened && ws.send("fail")
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wss.close()
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};
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ws.onclose = function (event) {
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wss.close()
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};
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break;
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};
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case "GET": {
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(async () => {
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console.log("Dial GET", url);
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ws.send("ok");
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const controller = new AbortController();
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/*
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Aborting a streaming response in JavaScript
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requires two levers to be pulled:
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First, the streaming read itself has to be cancelled using
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reader.cancel(), only then controller.abort() will actually work.
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If controller.abort() alone is called while a
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reader.read() is ongoing, it will block until the server closes the
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response, the page is refreshed or the network connection is lost.
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*/
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let reader = null;
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ws.onclose = (event) => {
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try {
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reader && reader.cancel();
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} catch(e) {};
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try {
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controller.abort();
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} catch(e) {};
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};
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try {
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upstreamGetCount += 1;
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const response = await fetch(url, {signal: controller.signal});
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const body = await response.body;
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reader = body.getReader();
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while (true) {
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const { done, value } = await reader.read();
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ws.send(value);
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if (done) break;
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};
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} finally {
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upstreamGetCount -= 1;
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console.log("Dial GET DONE, remaining: ", upstreamGetCount);
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ws.close();
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};
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})();
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break;
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};
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case "POST": {
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upstreamPostCount += 1;
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console.log("Dial POST", url);
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ws.send("ok");
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ws.onmessage = async (event) => {
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try {
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const response = await fetch(
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url,
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{method: "POST", body: event.data}
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);
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if (response.ok) {
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ws.send("ok");
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} else {
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console.error("bad status code");
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ws.send("fail");
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};
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} finally {
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upstreamPostCount -= 1;
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console.log("Dial POST DONE, remaining: ", upstreamPostCount);
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ws.close();
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};
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};
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break;
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};
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};
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check();
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};
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ws.onerror = function (event) {
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ws.close();
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};
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};
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let checkTask = setInterval(check, 1000);
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</script>
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</body>
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</html>
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