How to deal with upload image by Lagom

[Bond Chan]

Hi,

Anyone have an example of dealing with uploading Image with Lagom services ?

Regards,

Bond

[James Roper]

Hi Bond,

Currently it's not supported with the service API, however you can implement it by dropping down to the Play API in your service implementation:

import play.mvc.*;
import play.libs.streams.Accumulator;
import akka.stream.javadsl.*;

...

@Inject

private ExecutionContext ec;

public PlayServiceCall myServiceCall() {
  return wrapCall -> EssentialAction.of(rh -> {
    // Now you need to define an Akka streams sink to handle the image stream -
    // what that looks like depends on where you want to store the image.
    // I'm going to use one that pass in an output stream, but this uses blocking IO,
    // you should prefer something that's non blocking

    Sink<ByteString, CompletionStage<IOResult>> sink = StreamConverters.fromOutputStream(() -> {

      // Create output stream to write image to here

      return ...;

    });

    return Accumulator.fromSink(sink).map(ioResult -> {
      // Now you can create a Play result, eg:
      return Results.ok("Uploaded!");
    }, ec);
  });
}

Regards,

James

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James Roper
Software Engineer

Lightbend – Build reactive apps!
Twitter: @jroper

[Prateek Singhal]

Hi James,

I am also looking for lagom service API to upload image. Please let me know if  the same is supported by lagom or not.

Thanks,

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[Ignasi Marimon-Clos i Sunyol]

Hi Patreek, 

the thread you mentioned is Lagom code.

Lagom uses Play and Akka under the covers but it doesn't expose all the features Play or Akka have in every Lagom API.

You have to keep in mind that Lagom is not a web framework. Instead, Lagom is a microservices framework that's designed to work with different RPC protocols and the default protocol is HTTP+JSON.

Uploading a file is not the best use case for lagom, even though it's not impossible. (see the code in the thread you mentioned)

Cheers

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Ignasi Marimon-Clos

Software Developer @ Lagom

[Koleman Nix]

I just stumbled upon this thread and, until seeing James' code sample above, I had no idea about the `PlayServiceCall` trait. This is something that I think should be included in the Lagom documentation somewhere, even if it's only a few words and a small sample.

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[Ignasi Marimon-Clos i Sunyol]

Thanks Koleman. 

I've added an issue to work on it https://github.com/lagom/lagom/issues/1078

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[Ignasi Marimon-Clos i Sunyol]

HI,

there is now a lagom-recipe demonstrating how to handle File Upload side-band in a Lagom service.

This was a rather common request. The solution introduced in the recipe is slightly different to what James Roper suggested on this thread to demonstrate an alternative.

Cheers,