Source code
Revision control
Copy as Markdown
Other Tools
'use strict';
function openDatabase(name) {
return new Promise((resolve, reject) => {
const request = indexedDB.open(name, 1);
request.onupgradeneeded = () => {
request.result.createObjectStore('reads');
request.result.createObjectStore('writes');
};
request.onsuccess = () => resolve(request.result);
request.onerror = () => reject(request.error);
});
}
function readForEver(database) {
const step = () => {
const transaction = database.transaction('reads', 'readonly');
const request = transaction.objectStore('reads').get('k');
request.onsuccess = () => setTimeout(step, 0);
request.onerror = () => setTimeout(step, 0);
};
step();
}
function writeForEver(database) {
let value = 0;
const step = () => {
const transaction = database.transaction('writes', 'readwrite');
transaction.objectStore('writes').put(value++, 'k');
transaction.oncomplete = () => setTimeout(step, 0);
transaction.onabort = () => {};
transaction.onerror = () => {};
};
step();
}
self.onmessage = async (event) => {
const database = await openDatabase(event.data.name);
readForEver(database);
writeForEver(database);
self.postMessage('ready');
};