wehub-resource-sync
37 lines
1.2 KiB
TypeScript
37 lines
1.2 KiB
TypeScript
/**
|
|
* A single shared headless Chromium for local chart/diagram rendering.
|
|
*
|
|
* The rendering happens entirely in-process (our own browser) — only the
|
|
* charting *library* is fetched from a CDN; the user's data never leaves the
|
|
* host. Reuse one browser across renders so we don't pay a launch per call;
|
|
* `closeBrowser()` is wired into the bridge's shutdown.
|
|
*
|
|
* Requires a Chromium binary: `npx playwright install chromium`.
|
|
*/
|
|
import { chromium, type Browser } from "playwright";
|
|
|
|
let browserPromise: Promise<Browser> | undefined;
|
|
let closing = false;
|
|
|
|
export function getBrowser(): Promise<Browser> {
|
|
if (closing) {
|
|
return Promise.reject(new Error("renderer is shutting down"));
|
|
}
|
|
if (!browserPromise) {
|
|
browserPromise = chromium.launch({ args: ["--no-sandbox"] });
|
|
}
|
|
return browserPromise;
|
|
}
|
|
|
|
export async function closeBrowser(): Promise<void> {
|
|
if (!browserPromise) return;
|
|
// Claim shutdown and detach the promise BEFORE awaiting, so a concurrent
|
|
// getBrowser() rejects cleanly instead of handing back a browser we're
|
|
// about to close out from under it.
|
|
closing = true;
|
|
const pending = browserPromise;
|
|
browserPromise = undefined;
|
|
const b = await pending.catch(() => undefined);
|
|
await b?.close().catch(() => {});
|
|
}
|