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/* eslint-disable no-shadow */
interface CacheEntry<T> {
version: string;
value: T;
}
export class Store {
readonly dbp: Promise<IDBDatabase>;
constructor(dbName = "tg-cache", readonly storeName = "keyval") {
this.dbp = new Promise((resolve, reject) => {
const openreq = indexedDB.open(dbName, 1);
openreq.onerror = () => reject(openreq.error);
openreq.onsuccess = () => resolve(openreq.result);
// First time setup: create an empty object store
openreq.onupgradeneeded = () => {
openreq.result.createObjectStore(storeName);
};
});
}
withIDBStore(
type: IDBTransactionMode,
callback: (store: IDBObjectStore) => void
): Promise<void> {
return this.dbp.then(
(db) =>
new Promise<void>((resolve, reject) => {
const transaction = db.transaction(this.storeName, type);
transaction.oncomplete = () => resolve();
transaction.onabort = () => reject(transaction.error);
transaction.onerror = () => reject(transaction.error);
callback(transaction.objectStore(this.storeName));
})
);
}
}
let defaultStore: Store;
function getDefaultStore() {
if (!defaultStore) defaultStore = new Store();
return defaultStore;
}
export function get<Type>(
key: IDBValidKey,
store = getDefaultStore()
): Promise<CacheEntry<Type>> {
let req: IDBRequest;
return store
.withIDBStore("readonly", (store) => {
req = store.get(key);
})
.then(() => req.result);
}
export function set<Type>(
key: IDBValidKey,
value: Type,
version: string,
store = getDefaultStore()
): Promise<void> {
return store.withIDBStore("readwrite", (store) => {
store.put({ version, value }, key);
});
}
export function del(
key: IDBValidKey,
store = getDefaultStore()
): Promise<void> {
return store.withIDBStore("readwrite", (store) => {
store.delete(key);
});
}
export function clear(store = getDefaultStore()): Promise<void> {
return store.withIDBStore("readwrite", (store) => {
store.clear();
});
}
export function keys(store = getDefaultStore()): Promise<IDBValidKey[]> {
const dbkeys: IDBValidKey[] = [];
return store
.withIDBStore("readonly", (store) => {
// This would be store.getAllKeys(), but it isn't supported by Edge or Safari.
// And openKeyCursor isn't supported by Safari.
(store.openKeyCursor || store.openCursor).call(
store
).onsuccess = function () {
if (!this.result) return;
dbkeys.push(this.result.key);
this.result.continue();
};
})
.then(() => dbkeys);
}
export default {
get,
set,
keys,
del,
clear,
};