import keyval from "idb-keyval" import debounce from 'lodash/debounce' import { OBJECT_STORE, getDatabase } from './shared' const MAX_NUM_STORED_STATUSES = 1000 const CLEANUP_INTERVAL = 60000 async function cleanup(instanceName, timeline) { const db = await getDatabase(instanceName, timeline) return await new Promise((resolve, reject) => { const tx = db.transaction(OBJECT_STORE, 'readwrite') const store = tx.objectStore(OBJECT_STORE) const index = store.index('pinafore_id_as_negative_big_int') store.count().onsuccess = (e) => { let count = e.target.result if (count <= MAX_NUM_STORED_STATUSES) { return } let openKeyCursor = index.openKeyCursor || index.openCursor openKeyCursor.call(index, null, 'prev').onsuccess = (e) => { let cursor = e.target.result if (--count < MAX_NUM_STORED_STATUSES || !cursor) { return } store.delete(cursor.primaryKey).onsuccess = () => { cursor.continue() } } } tx.oncomplete = () => resolve() tx.onerror = () => reject(tx.error.name + ' ' + tx.error.message) }) } export const cleanupOldStatuses = debounce(async () => { console.log('cleanupOldStatuses') let knownDbs = (await keyval.get('known_dbs')) || {} let dbNames = Object.keys(knownDbs) for (let dbName of dbNames) { let [ instanceName, timeline ] = knownDbs[dbName] await cleanup(instanceName, timeline) } console.log('done cleanupOldStatuses') }, CLEANUP_INTERVAL)