72 lines
2.0 KiB
TypeScript
72 lines
2.0 KiB
TypeScript
import { AssetBundle } from "../asset_bundle/bundle.ts";
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import { ISQLite } from "./sqlite_interface.ts";
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import workerBundleJson from "./worker_bundle.json" assert { type: "json" };
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const workerBundle = new AssetBundle(workerBundleJson);
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export class AsyncSQLite implements ISQLite {
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worker: Worker;
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requestId = 0;
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outstandingRequests = new Map<
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number,
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{ resolve: (val: any) => void; reject: (error: Error) => void }
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>();
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constructor(readonly dbPath: string) {
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const workerHref = URL.createObjectURL(
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new Blob([
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workerBundle.readFileSync("worker.js"),
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], {
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type: "application/javascript",
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}),
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);
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this.worker = new Worker(
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workerHref,
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{
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type: "module",
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},
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);
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this.worker.addEventListener("message", (event: MessageEvent) => {
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const { data } = event;
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// console.log("Got data back", data);
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const { id, result, error } = data;
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const req = this.outstandingRequests.get(id);
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if (!req) {
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console.error("Invalid request id", id);
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return;
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}
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if (result !== undefined) {
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req.resolve(result);
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} else if (error) {
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req.reject(new Error(error));
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}
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this.outstandingRequests.delete(id);
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});
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}
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private request(message: Record<string, any>): Promise<any> {
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this.requestId++;
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return new Promise((resolve, reject) => {
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this.outstandingRequests.set(this.requestId, { resolve, reject });
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// console.log("Sending request", message);
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this.worker.postMessage({ ...message, id: this.requestId });
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});
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}
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init(): Promise<void> {
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return this.request({ type: "init", dbPath: this.dbPath });
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}
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execute(query: string, ...params: any[]): Promise<number> {
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return this.request({ type: "execute", query, params });
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}
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query(query: string, ...params: any[]): Promise<any[]> {
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return this.request({ type: "query", query, params });
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}
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stop() {
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this.worker.terminate();
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}
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}
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