express.js about reactql

[leebenson]

You could edit kit/entry/server.js and re-write it with Express if you wanted, but I wouldn't recommend it.

Koa uses Promises as route handlers, which makes it possible to have middleware that 'awaits' further handlers, and thus interact with different parts of the request. We use that in the 'timer' as shown here:

  // It's useful to see how long a request takes to respond.  Add the
  // timing to a HTTP Response header
  .use(async (ctx, next) => {
    const start = ms.now();
    await next(); // <--- this 'yields' to the next handler, and resumes when it's done!
    const end = ms.parse(ms.since(start));
    const total = end.microseconds + (end.milliseconds * 1e3) + (end.seconds * 1e6);
    ctx.set('Response-Time', `${total / 1e3}ms`);
  });

AFAIK, you can't use that pattern in express, which makes it harder for a kit like ReactQL to implement convenience handlers like the one above.

I'd recommend you spend a few mins on http://koajs.com/ - it's basically 90% express, but using async functions as route handlers and the route 'context' being passed as an explicit parameter. It's the same Node HTTP server under the hood.

[ablbol]

Good point. Thanks for letting me know.
Does Graphql support subscriptions with Koa? I really need it for my current project.

[leebenson]

Yes, check out http://dev.apollodata.com/tools/graphql-subscriptions/

It hasn't been implemented in the ReactQL kit, but might be something that's added later.