web-locks-header-batch-update.tentative.https.sub.html (3439B)
1 <!doctype html> 2 <script src="/resources/testharness.js"></script> 3 <script src="/resources/testharnessreport.js"></script> 4 <script src="/common/utils.js"></script> 5 <script src="/shared-storage/resources/util.js"></script> 6 <script src="/fenced-frame/resources/utils.js"></script> 7 8 <body> 9 <script> 10 'use strict'; 11 12 promise_test(async t => { 13 const worklet = await sharedStorage.createWorklet('resources/simple-module.js'); 14 15 const ancestor_key = token(); 16 const url0 = generateURL("/shared-storage/resources/frame0.html", 17 [ancestor_key]); 18 const url1 = generateURL("/shared-storage/resources/frame1.html", 19 [ancestor_key]); 20 21 // Invoke `selectURL()` to perform the following steps: 22 // 1. Acquires the lock. 23 // 2. Reads the current value at the given key. 24 // 3. Waits for 500ms. 25 // 4. Sets the shared storage value to the read value appended with the given letter. 26 // 5. Releases the lock. 27 // 28 // After 100ms, send a fetch() request. The response sends the 29 // `Shared-Storage-Write` header that: 30 // - Acquires the same named lock via the batch `options` 31 // - Executes two `append` methods, each appending the same letter. 32 // 33 // Expected behavior: After both of them finish, the value at the given key 34 // should contain the letter repeated three times. 35 // 36 // This demonstrates that: 37 // 1. The `withLock` option is effective, preventing the header batch update 38 // interfering with the "get and set" operation. If the lock were not used, 39 // the final value would likely be a single letter. 40 // 2. The header batch update correctly executes all `append` methods within 41 // the batch. 42 // 43 // Note: This test remains valid even if the header batch update happens 44 // outside the critical section protected by the lock within the worklet. The 45 // test effectively demonstrates mutual exclusion as long as there's a 46 // reasonable chance for the header batch update to occur while the worklet is 47 // still running. 48 const select_url_result = await worklet.selectURL( 49 "get-wait-set-within-lock", 50 [{url: url0}, {url: url1}], 51 {data: {'key': 'key', 52 'lock_name': 'lock1', 53 'append_letter': 'a'}, 54 resolveToConfig: true}); 55 56 // Busy wait for 100ms. 57 const startWaitTime = Date.now(); 58 while (Date.now() - startWaitTime < 100) {} 59 60 // After 100ms, send a fetch() request. The response sends the 61 // `Shared-Storage-Write` header that: 62 // - Acquires the same named lock via the batch `options` 63 // - Executes two `append` methods, each appending the same letter. 64 const rawUpdatesHeader = 'append;key=key;value=a, append;key=key;value=a, options;with_lock=lock1'; 65 const updatesHeader = encodeURIComponent(rawUpdatesHeader); 66 const updatesUrl = 67 `/shared-storage/resources/shared-storage-write.py?write=${updatesHeader}`; 68 69 const response = await fetch(updatesUrl, {sharedStorageWritable: true}); 70 const sharedStorageWritableHeader = await response.text(); 71 assert_equals(sharedStorageWritableHeader, "?1"); 72 73 attachFencedFrame(select_url_result, 'opaque-ads'); 74 const result = await nextValueFromServer(ancestor_key); 75 assert_equals(result, "frame1_loaded"); 76 77 await verifyKeyValueForOrigin('key', 'aaa', location.origin); 78 79 await deleteKeyForOrigin('key', location.origin); 80 }, 'Test for batch withLock option in the Shared-Storage-Write response header'); 81 82 </script> 83 </body>