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misskey/src/client/db.ts

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import { Store } from 'idb-keyval';
// Provide functions from idb-keyval
export { get, set, del, clear, keys } from 'idb-keyval';
//#region Construct DB
export const clientDb = {
i18n: new Store('MisskeyClient', 'i18n')
};
//#endregion
//#region Provide some tool functions
function openTransaction(store: Store, mode: IDBTransactionMode): Promise<IDBTransaction>{
return store._dbp.then(db => db.transaction(store.storeName, mode));
}
export function entries(store: Store): Promise<[IDBValidKey, unknown][]> {
const entries: [IDBValidKey, unknown][] = [];
return store._withIDBStore('readonly', store => {
store.openCursor().onsuccess = function () {
if (!this.result) return;
entries.push([this.result.key, this.result.value]);
this.result.continue();
};
}).then(() => entries);
}
export async function bulkGet(keys: IDBValidKey[], store: Store): Promise<[IDBValidKey, unknown][]> {
const valPromises: Promise<[IDBValidKey, unknown]>[] = [];
const tx = await openTransaction(store, 'readwrite');
const st = tx.objectStore(store.storeName);
for (const key of keys) {
valPromises.push(new Promise((resolve, reject) => {
const getting = st.get(key);
getting.onsuccess = function (e) {
return resolve([key, this.result]);
};
getting.onerror = function (e) {
return reject(this.error);
};
}));
}
return new Promise((resolve, reject) => {
tx.oncomplete = () => resolve(Promise.all(valPromises));
tx.abort = tx.onerror = () => reject(tx.error);
});
}
export async function bulkSet(map: [IDBValidKey, any][], store: Store): Promise<void> {
const tx = await openTransaction(store, 'readwrite');
const st = tx.objectStore(store.storeName);
for (const [key, value] of map) {
st.put(value, key);
}
return new Promise((resolve, reject) => {
tx.oncomplete = () => resolve();
tx.abort = tx.onerror = () => reject(tx.error);
});
}
export function count(store: Store): Promise<number> {
let req: IDBRequest<number>;
return store._withIDBStore('readonly', store => {
req = store.count();
}).then(() => req.result);
}
//#endregion