Mixing Async and Sync handlers in ring?

[andersmurphy]

So I’m looking to add an async handler to our compojure routes for server sent events. However, from what I can tell I can’t do this without making all our handlers async. Ideally I just want to make this one handler async.

How do people normally approach this problem? Thanks.

[dimovich]

What webserver are you using?
Usually you need to change only the middlewares that modify the response. For Aleph there is – aleph-middleware

There is a similar discussion going on in #aleph

And another comment regarding mixing sync / async ring handlers. A solution would be to use Reitit Interceptors.

[andersmurphy]

I’m just using ring (jetty) as the web server. But when I change :async? to true:

(jetty/run-jetty app {:port port :join? false :async? true})

Then none of my sync routes work. I don’t even know if it’s possible to have both sync and async handlers on the same jetty server (so I might be asking for the impossible here ).

EDIT: I’m using compojure for routing

[ShiTianshu]

Did anyone make some performance tests on the sync vs async?

[andersmurphy]

The easiest solution for me was just to migrate our project to aleph. Which amazingly just worked without having to change any of the existing end points.