web-locks-header-modifier-method.tentative.https.sub.html

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This WPT test may be referenced by the following Test IDs:
- /shared-storage/web-locks-header-modifier-method.tentative.https.sub.html - WPT Dashboard Interop Dashboard

<!doctype html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/common/utils.js"></script>

<script src="/shared-storage/resources/util.js"></script>

<script src="/fenced-frame/resources/utils.js"></script>

<body>

<script>

'use strict';

promise_test(async t => {

  let worklet = await sharedStorage.createWorklet('resources/simple-module.js');

  const ancestor_key = token();

  let url0 = generateURL("/shared-storage/resources/frame0.html",

                         [ancestor_key]);

  let url1 = generateURL("/shared-storage/resources/frame1.html",

                         [ancestor_key]);

  // Invoke `selectURL()` to perform the following steps:

  // 1. Acquires the lock.

  // 2. Reads the current value at the given key.

  // 3. Waits for 500ms.

  // 4. Sets the shared storage value to the read value appended with the given letter.

  // 5. Releases the lock.

//

  // After 100ms, send a fetch() request. The response triggers the `append`

  // method with the same lock and the same letter.

//

  // Expected behavior: After both of them finish, the value at the given key

  // should contain the letter repeated twice.

//

  // This demonstrates that the `withLock` option is effective, preventing the

  // `append` method interfering with the "get and set" operation. If the lock

  // were not used, the final value would likely be a single letter.

//

  // Note: This test remains valid even if the header `append` happens outside

  // the critical section protected by the lock within the worklet. The test

  // effectively demonstrates mutual exclusion as long as there's a reasonable

  // chance for `append` to occur while the worklet is still running.

  let select_url_result = await worklet.selectURL(

      "get-wait-set-within-lock",

      [{url: url0}, {url: url1}],

      {data: {'key': 'key',

              'lock_name': 'lock1',

              'append_letter': 'a'},

      resolveToConfig: true});

  // Busy wait for 100ms.

  const startWaitTime = Date.now();

  while (Date.now() - startWaitTime < 100) {}

  // Send a fetch() request. The response triggers the `append` method with the

  // same lock and the same letter.

  const rawUpdatesHeader = 'append;key=key;value=a;with_lock=lock1';

  const updatesHeader = encodeURIComponent(rawUpdatesHeader);

  const updatesUrl =

    `/shared-storage/resources/shared-storage-write.py?write=${updatesHeader}`;

  let response = await fetch(updatesUrl, {sharedStorageWritable: true});

  let sharedStorageWritableHeader = await response.text();

  assert_equals(sharedStorageWritableHeader, "?1");

  attachFencedFrame(select_url_result, 'opaque-ads');

  const result = await nextValueFromServer(ancestor_key);

  assert_equals(result, "frame1_loaded");

  await verifyKeyValueForOrigin('key', 'aa', location.origin);

  await deleteKeyForOrigin('key', location.origin);

}, 'Test for withLock option in the Shared-Storage-Write response header');

</script>

</body>