stats.https.any.js

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This test has a WPT meta file that expects 8 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /webtransport/stats.https.any.html - WPT Dashboard Interop Dashboard
- /webtransport/stats.https.any.serviceworker.html - WPT Dashboard Interop Dashboard
- /webtransport/stats.https.any.sharedworker.html - WPT Dashboard Interop Dashboard
- /webtransport/stats.https.any.worker.html - WPT Dashboard Interop Dashboard

// META: global=window,worker

// META: script=/common/get-host-info.sub.js

// META: script=resources/webtransport-test-helpers.sub.js

function validate_rtt_stats(stats) {

  // The assumption below is that the RTT to localhost is under 5 seconds,

  // which is fairly generous.

  assert_greater_than(stats.minRtt, 0, "minRtt");

  assert_less_than(stats.minRtt, 5 * 1000, "minRtt");

  assert_greater_than(stats.smoothedRtt, 0, "smoothedRtt");

  assert_less_than(stats.smoothedRtt, 5 * 1000, "smoothedRtt");

promise_test(async t => {

  const wt = new WebTransport(webtransport_url('echo.py'));

  await wt.ready;

  const stats = await wt.getStats();

  validate_rtt_stats(stats);

  assert_equals(stats.datagrams.expiredOutgoing, 0);

  assert_equals(stats.datagrams.droppedIncoming, 0);

  assert_equals(stats.datagrams.lostOutgoing, 0);

}, "WebTransport client should be able to provide stats after connection has been established");

promise_test(async t => {

  const wt = new WebTransport(webtransport_url('echo.py'));

  await wt.ready;

  wt.close();

  const stats = await wt.getStats();

  validate_rtt_stats(stats);

}, "WebTransport client should be able to provide stats after connection has been closed");

promise_test(async t => {

  const wt = new WebTransport(webtransport_url('echo.py'));

  await wt.ready;

  const statsPromise = wt.getStats();

  wt.close();

  const stats = await statsPromise;

  validate_rtt_stats(stats);

}, "WebTransport client should be able to provide stats requested right before connection has been closed");

promise_test(async t => {

  const wt = new WebTransport(webtransport_url('echo.py'));

  const stats = await wt.getStats();

  validate_rtt_stats(stats);

}, "WebTransport client should be able to provide valid stats when requested before connection established");

promise_test(async t => {

  const wt = new WebTransport("https://webtransport.invalid/");

  wt.ready.catch(e => {});

  wt.closed.catch(e => {});

  const error = await wt.getStats().catch(e => e);

  assert_equals(error.code, DOMException.INVALID_STATE_ERR);

  const error2 = await wt.getStats().catch(e => e);

  assert_equals(error2.code, DOMException.INVALID_STATE_ERR);

}, "WebTransport client should throw an error when stats are requested for a failed connection");

promise_test(async t => {

  const wt = new WebTransport(webtransport_url('echo.py'));

  await wt.ready;

  const stats1 = wt.getStats();

  const stats2 = wt.getStats();

  assert_true(stats1 != stats2, "different promise returned for different getStats() calls");

  validate_rtt_stats(await stats1);

  validate_rtt_stats(await stats2);

}, "WebTransport client should be able to handle multiple concurrent stats requests");

promise_test(async t => {

  const wt = new WebTransport(webtransport_url('echo.py'));

  await wt.ready;

  const stats1 = await wt.getStats();

  validate_rtt_stats(stats1);

  const stats2 = await wt.getStats();

  validate_rtt_stats(stats2);

}, "WebTransport client should be able to handle multiple sequential stats requests");

promise_test(async t => {

  const wt = new WebTransport(webtransport_url('echo.py'));

  await wt.ready;

  const numDatagrams = 64;

  wt.datagrams.incomingHighWaterMark = 4;

  const writer = wt.datagrams.writable.getWriter();

  const encoder = new TextEncoder();

  const promises = [];

  while (promises.length < numDatagrams) {

    const token = promises.length.toString();

    promises.push(writer.write(encoder.encode(token)));

  await Promise.all(promises);

  const maxAttempts = 40;

  let stats;

  for (let i = 0; i < maxAttempts; i++) {

    wait(50);

    stats = await wt.getStats();

    if (stats.datagrams.droppedIncoming > 0) {

      break;

  assert_greater_than(stats.datagrams.droppedIncoming, 0);

  assert_less_than_equal(stats.datagrams.droppedIncoming,

                         numDatagrams - wt.datagrams.incomingHighWaterMark);

}, "WebTransport client should be able to provide droppedIncoming values for datagrams");