use lock

src/app.service.ts

@@ -27,6 +27,7 @@ export class AppService extends ConsoleLogger {
     const url = req.originalUrl.startsWith('/')
       ? req.originalUrl.slice(1)
       : req.originalUrl;
+    return this.aragami.lock(url, async () => {
       const siteCache = await this.aragami.get(SiteCache, url);
       if (siteCache) {
         this.log(`Cache hit for ${url}`);
@@ -44,5 +45,6 @@ export class AppService extends ConsoleLogger {
           `Page not found: ${url}`,
         ).toException();
       }
+    });
   }
 }