77 lines
2.2 KiB
TypeScript
77 lines
2.2 KiB
TypeScript
const worker = new Worker(new URL('./db-worker.ts', import.meta.url), {
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type: 'module',
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});
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let requestId = 0;
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type WorkerRequest = {
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resolve: (data: any) => void;
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reject: (error: Error) => void;
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};
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let initPromise: Promise<void> | null = null;
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const pending = new Map<number, WorkerRequest>();
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export function initWorker(): Promise<void> {
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if (initPromise) return initPromise;
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initPromise = new Promise((resolve, reject) => {
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worker.onmessage = (e: MessageEvent) => {
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const msg = e.data;
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if (msg.type === 'ready') {
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// Готов — запрос init уже обработан
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return;
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}
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const pendingReq = pending.get(msg.id);
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if (!pendingReq) return;
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pending.delete(msg.id);
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if (msg.type == "success") {
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pendingReq.resolve(msg.data);
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} else {
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pendingReq.reject(new Error(msg.error ?? msg.message ?? 'Неизвестная ошибка Worker'));
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}
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};
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worker.onerror = (err) => {
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console.error('[SQLite Worker] Ошибка:', err);
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reject(new Error('Ошибка Worker'));
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};
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// Отправляем init
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const id = ++requestId;
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pending.set(id, { resolve, reject });
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worker.postMessage({ type: 'start', id });
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});
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return initPromise;
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}
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function sendToWorker(type: string, payload?: any): Promise<any> {
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return new Promise((resolve, reject) => {
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if (!worker) {
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reject(new Error('Worker не создан'));
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return;
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}
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const id = ++requestId;
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pending.set(id, { resolve, reject });
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worker.postMessage({ type, id, ...payload });
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});
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}
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export async function query(sql: string, params?: any[]): Promise<any[]> {
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const result = await sendToWorker('query', { sql, params: params ?? [] });
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return result;
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}
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export async function command(sql: string, params?: any[]): Promise<void> {
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await sendToWorker('command', { sql, params: params ?? [] });
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}
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export async function closeDb(): Promise<void> {
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await sendToWorker('close');
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worker.terminate();
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} |