gecko-dev/netwerk/test/unit/test_progress.js

const { HttpServer } = ChromeUtils.import("resource://testing-common/httpd.js");

XPCOMUtils.defineLazyGetter(this, "URL", function() {
  return "http://localhost:" + httpserver.identity.primaryPort;
});

var httpserver = new HttpServer();
var testpath = "/simple";
var httpbody = "0123456789";

var last = 0,
  max = 0;

const STATUS_RECEIVING_FROM = 0x804b0006;
const LOOPS = 50000;

const TYPE_ONSTATUS = 1;
const TYPE_ONPROGRESS = 2;
const TYPE_ONSTARTREQUEST = 3;
const TYPE_ONDATAAVAILABLE = 4;
const TYPE_ONSTOPREQUEST = 5;

var progressCallback = {
  _listener: null,
  _got_onstartrequest: false,
  _got_onstatus_after_onstartrequest: false,
  _last_callback_handled: null,

  QueryInterface: ChromeUtils.generateQI([
    "nsIProgressEventSink",
    "nsIStreamListener",
    "nsIRequestObserver",
  ]),

  getInterface(iid) {
    if (
      iid.equals(Ci.nsIProgressEventSink) ||
      iid.equals(Ci.nsIStreamListener) ||
      iid.equals(Ci.nsIRequestObserver)
    ) {
      return this;
    }
    throw Cr.NS_ERROR_NO_INTERFACE;
  },

  onStartRequest(request) {
    Assert.equal(this._last_callback_handled, TYPE_ONSTATUS);
    this._got_onstartrequest = true;
    this._last_callback_handled = TYPE_ONSTARTREQUEST;

    this._listener = new ChannelListener(checkRequest, request);
    this._listener.onStartRequest(request);
  },

  onDataAvailable(request, data, offset, count) {
    Assert.equal(this._last_callback_handled, TYPE_ONPROGRESS);
    this._last_callback_handled = TYPE_ONDATAAVAILABLE;

    this._listener.onDataAvailable(request, data, offset, count);
  },

  onStopRequest(request, status) {
    Assert.equal(this._last_callback_handled, TYPE_ONDATAAVAILABLE);
    Assert.ok(this._got_onstatus_after_onstartrequest);
    this._last_callback_handled = TYPE_ONSTOPREQUEST;

    this._listener.onStopRequest(request, status);
    delete this._listener;
  },

  onProgress(request, context, progress, progressMax) {
    Assert.equal(this._last_callback_handled, TYPE_ONSTATUS);
    this._last_callback_handled = TYPE_ONPROGRESS;

    Assert.equal(mStatus, STATUS_RECEIVING_FROM);
    last = progress;
    max = progressMax;
  },

  onStatus(request, context, status, statusArg) {
    if (!this._got_onstartrequest) {
      // Ensure that all messages before onStartRequest are onStatus
      if (this._last_callback_handled) {
        Assert.equal(this._last_callback_handled, TYPE_ONSTATUS);
      }
    } else if (this._last_callback_handled == TYPE_ONSTARTREQUEST) {
      this._got_onstatus_after_onstartrequest = true;
    } else {
      Assert.equal(this._last_callback_handled, TYPE_ONDATAAVAILABLE);
    }
    this._last_callback_handled = TYPE_ONSTATUS;

    Assert.equal(statusArg, "localhost");
    mStatus = status;
  },

  mStatus: 0,
};

function run_test() {
  httpserver.registerPathHandler(testpath, serverHandler);
  httpserver.start(-1);
  var channel = setupChannel(testpath);
  channel.asyncOpen(progressCallback);
  do_test_pending();
}

function setupChannel(path) {
  var chan = NetUtil.newChannel({
    uri: URL + path,
    loadUsingSystemPrincipal: true,
  });
  chan.QueryInterface(Ci.nsIHttpChannel);
  chan.requestMethod = "GET";
  chan.notificationCallbacks = progressCallback;
  return chan;
}

function serverHandler(metadata, response) {
  response.setHeader("Content-Type", "text/plain", false);
  for (let i = 0; i < LOOPS; i++) {
    response.bodyOutputStream.write(httpbody, httpbody.length);
  }
}

function checkRequest(request, data, context) {
  Assert.equal(last, httpbody.length * LOOPS);
  Assert.equal(max, httpbody.length * LOOPS);
  httpserver.stop(do_test_finished);
}