Support scheduled architects trigger

[sroze]

Architect offers a @scheduled construct, allowing to trigger functions regularly. There is no documentation whatsoever about using it in remix and the adapter currently assumes only HTTP API Gateway invocations. In order to make it work, you need to use a custom server and fiddle around.

Make it work using a custom server

This sample below works and enables you to catch another type of event coming to your application.

# app.arc

@scheduled
name-of-the-thing
  cron */5 * * * ? *
  src server

server.ts

import { createRequestHandler } from "@remix-run/architect";
import * as build from "@remix-run/dev/server-build";
import type { ServerBuild } from "@remix-run/node";
import type {APIGatewayProxyEventV2, ScheduledEvent} from "aws-lambda";
import type {Handler} from "aws-lambda/handler";

const httpHandler = createRequestHandler({
  build: build as unknown as ServerBuild,
  mode: process.env.NODE_ENV,
});

export const handler: Handler = (event: APIGatewayProxyEventV2 | ScheduledEvent, context, callback) => {
  if ('detail-type' in event) {
    // Catch scheduled events here and do what you want!
    console.log(event);

    callback(null, null);
    return;
  }

  return httpHandler(event, context, callback);
};

There are still challenges

1. First, you don't know which of the "scheduled" the invocation was triggered from. The resources property of the event contains the EventBridge schedule ARN but given arc isolates the resources per application, you need to find a "mapping" and as opposed to what's happening with DynamoDB tables or buckets, it's not sent to AWS' Parameter Store.
2. It is re-using the same server so basically, you have plenty of the application's unnecessary code in the Lambda too.

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Does anyone know about a better way of doing it?
Does anyone have an idea about a nice DX that could be provided for such use-cases?