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<!DOCTYPE html>
<title>This iframe keeps a transaction on a database alive indefinitely to test</title>
<script>
// Keeps the passed transaction alive indefinitely (by making requests
// against the named store). Returns a function that asserts that the
// transaction has not already completed and then ends the request loop so that
// the transaction may autocommit and complete.
function keep_alive(tx, store_name) {
let completed = false;
tx.addEventListener('complete', () => { completed = true; });
let keepSpinning = true;
function spin() {
if (!keepSpinning)
return;
tx.objectStore(store_name).get(0).onsuccess = spin;
}
spin();
return () => {
assert_false(completed, 'Transaction completed while kept alive');
keepSpinning = false;
};
}
async function run() {
const dbs_to_delete = await indexedDB.databases();
for (const db_info of dbs_to_delete) {
let request = indexedDB.deleteDatabase(db_info.name);
await new Promise((resolve, reject) => {
request.onsuccess = resolve;
request.onerror = reject;
});
}
var openRequest = indexedDB.open('db-isolation-test');
openRequest.onupgradeneeded = () => {
openRequest.result.createObjectStore('s');
};
openRequest.onsuccess = () => {
var tx = openRequest.result.transaction('s', 'readonly', {durability: 'relaxed'});
keep_alive(tx, 's');
window.parent.postMessage("keep_alive_started", "*");
};
}
run();
</script>