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import { AsyncLocalStorage } from 'node:async_hooks';
import { NodeApp } from 'astro/app/node';
import type { RequestHandler } from './types.js';
/**
* Creates a Node.js http listener for on-demand rendered pages, compatible with http.createServer and Connect middleware.
* If the next callback is provided, it will be called if the request does not have a matching route.
* Intended to be used in both standalone and middleware mode.
*/
export function createAppHandler(app: NodeApp): RequestHandler {
/**
* Keep track of the current request path using AsyncLocalStorage.
* Used to log unhandled rejections with a helpful message.
*/
const als = new AsyncLocalStorage<string>();
const logger = app.getAdapterLogger();
process.on('unhandledRejection', (reason) => {
const requestUrl = als.getStore();
logger.error(`Unhandled rejection while rendering ${requestUrl}`);
console.error(reason);
});
return async (req, res, next, locals) => {
let request: Request;
try {
request = NodeApp.createRequest(req);
} catch (err) {
logger.error(`Could not render ${req.url}`);
console.error(err);
res.statusCode = 500;
res.end('Internal Server Error');
return;
}
const routeData = app.match(request);
if (routeData) {
const response = await als.run(request.url, () =>
app.render(request, {
addCookieHeader: true,
locals,
routeData,
})
);
await NodeApp.writeResponse(response, res);
} else if (next) {
return next();
} else {
const response = await app.render(req);
await NodeApp.writeResponse(response, res);
}
};
}
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