Akka HTTP Java Directives examples

[Daniel Stoner]

The current documentation for AkkaHttp directives:

http://doc.akka.io/docs/akka-stream-and-http-experimental/2.0.3/java/http/routing-dsl/directives/index.html#directives-java

Says you can filter requests and modify requests/responses.

I'd love to be able to implement such a thing - but I've seen no examples of custom directives in Java.

Does anyone have an example they could post that shows modifying request/response. My use case is that I need to implement several things (As separate directives):

1) The equivalent of server access logs (Saying someone tried to go to /GET?queryParam=x and this took 120ms to respond)

2) Authentication via an external OAUTH system where requests may be rejected with the equivalent of access denied responses. [Perhaps this is better done as a Handler implementation? What are your thoughts?]

I get how I could potentially nest handlers in a way such that I can do:

pathSingleSlash().route(

 get(path("home").route(handleWidth(new AuthenticationHandler(homeHandler)))

 post(path("home").route(handleWidth(new AuthenticationHandler(homePostHandler)))

)

But I think Directives sound like the better place to put this logic at the top of the route tree rather than repeat it constantly in all the bottom leaves.

Thanks kindly,

Daniel Stoner

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Daniel Stoner | Senior Software Engineer UtopiaIT | Ocado Technology

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[Konrad Malawski]

Hi Daniel,

Before I dive into your question I'd like to highlight that the Java directives are undergoing an intense

rewrite just now (they're still experimental, so that's why we must do it now), 

and will be way more elastic soon: https://github.com/akka/akka/pull/19632/files?diff=unified

So it's not a very good time to invest heavily into the existing JavaDSL.

I'll give your exact need a closer look a bit later to see how we cover it in the new DSL.

-- 

Cheers,

Konrad 'ktoso’ Malawski
Akka @ Typesafe

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[Daniel Stoner]

Thanks Konrad for the incredibly quick reply, I look forward to seeing the new mechanisms.

By soon - what kind of timeline are you thinking?

At the moment we are prototyping a product in akka-http so we aren't worried (at this stage at least) about production readiness too much and if we have to rewrite a layer of the app then so be it.

Is there a SNAPSHOT/nightly build version or the likes where I can try out the new DSL?

Thanks again,

Dan

[Konrad Malawski]

It's not yet merged nor complete.

We'll focus on it after shipping 2.4.2 (tomorrow) and are hoping to include it in 2.4.3,

timeline wise I can't promise anything though. 

Hope this helps.

-- 

Cheers,

Konrad 'ktoso’ Malawski
Akka @ Typesafe

[Daniel Stoner]

Hi Konrad/Others,

I notice that Github issue was taken over into: https://github.com/akka/akka/pull/20088 and has not made it yet into v2.4.4.

Is it on the roadmap for 2.4.5 or is there any update about plans for this?

Thanks kindly,

Daniel Stoner

[Konrad Malawski]

As explained in the release notes on Akka.io/news we had to expedite the release of 2.4.4 as 2.4.3 had some blocker issues for users of https.

Since then we continue to focus explicitly on the javadsl, spent entire weeks specifically on polishing it recently :)

We think we'll be ready to ship it in 2.4.5 which is just a few days away actually.

-- 
Konrad Malawski

[Daniel Stoner]

Thank you Konrad.

Having just finished the 2.4.4 upgrade I think you've all done a great job on moving user closer to the native Java 8 styling which can only be a good thing long term for adopters of the framework.