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Pre-launch Chromium on server startup to avoid cold-start blocking

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Chromium cold launch takes several seconds and blocks the event
loop, preventing SSE events from flushing. Now the browser is
warmed up during server startup if any store uses render_js,
so the first search doesn't pay the launch penalty.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
mariosemes
2026-03-26 22:42:15 +01:00
parent 80335d213c
commit 0e2e8d1766
2 changed files with 14 additions and 0 deletions
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8
src/server/index.ts
View File

@@ -7,6 +7,8 @@ import { config } from './config.js';
import { initDatabase, startAutoSave, saveDatabase } from './db/connection.js'; import { initDatabase, startAutoSave, saveDatabase } from './db/connection.js';
import { runMigrations } from './db/migrate.js'; import { runMigrations } from './db/migrate.js';
import { syncFromFiles } from './services/store-sync.js'; import { syncFromFiles } from './services/store-sync.js';
import { warmupBrowser } from './scraper/browser-scraper.js';
import { getEnabledStores } from './models/store.js';
import { storeRoutes } from './routes/stores.js'; import { storeRoutes } from './routes/stores.js';
import { categoryRoutes } from './routes/categories.js'; import { categoryRoutes } from './routes/categories.js';
import { searchRoutes } from './routes/search.js'; import { searchRoutes } from './routes/search.js';
@@ -63,6 +65,12 @@ if (sync.errors.length > 0) {
startAutoSave(); startAutoSave();
// Pre-launch Chromium if any store needs JS rendering
const hasJsStores = getEnabledStores().some((s) => s.render_js);
if (hasJsStores) {
warmupBrowser().catch((err) => app.log.warn(`Browser warmup failed: ${err}`));
}
// Save database on shutdown // Save database on shutdown
process.on('SIGINT', () => { saveDatabase(); process.exit(0); }); process.on('SIGINT', () => { saveDatabase(); process.exit(0); });
process.on('SIGTERM', () => { saveDatabase(); process.exit(0); }); process.on('SIGTERM', () => { saveDatabase(); process.exit(0); });

6
src/server/scraper/browser-scraper.ts
View File

@@ -116,6 +116,12 @@ export async function scrapeStoreWithBrowser(store: Store, searchUrl: string): P
} }
} }
export async function warmupBrowser(): Promise<void> {
log('Warming up browser...');
await getBrowser();
log('Browser ready');
}
export async function closeBrowser(): Promise<void> { export async function closeBrowser(): Promise<void> {
if (browser) { if (browser) {
await browser.close(); await browser.close();