Waiting for callback

[bernatfortet]

I am trying to create an endpoint inside my meteor API to use an NPM library that requests information from an API. Ideally I would like to be able to do the following

Meteor.Router.add(
    "/request/:id.json", ( requestId ) ->
        someLibrary.request( 'someUrl', ( err, data ) ->
                return data
        )

Clearly... this is not possible as Meteor doesn't wait for the callback

I have tried the following without much success:

Meteor.Router.add(
    "/request/:id.json", ( requestId ) ->
        future = new Future();
        Meteor.setTimeout( =>
            return future["this is not printend in the window"]
        , 1000)
                return future.wait();
)

In this case, the future['content'] is not printend as a response.

I have been trying other options without luck. Any idea on how to do this?

Thanks!

[tmeasday]

Hi, you'll need to call future.return(...) to get the data out to the the future.wait().

Apart from that I think you are on the right track.

[bernatfortet]

@tmeasday future.return(...) works. But I cannot return an object var response = {} The error is: TypeError: first argument must be a string or Buffer

Any idea? Thanks for your help!

[tmeasday]

From memory, you have to return a string or an array in a server route https://github.com/tmeasday/meteor-router#server-side-routing

[bernatfortet]

This is the exact code I am using

Meteor.Router.add(
    "/api/v1/cards/:id.json", ( cardId ) ->

        future = new Future();
        card = {}

        Meteor.setTimeout( =>
            console.log card
            return future.return( card )
        , 1000)

        return future.wait();
        tutor.card( cardId, ( err, respone ) =>
            card = respone
        )
)

Card is return as a JSON object

[tmeasday]

Yes but what do you actually want to return? Maybe EJSON.serialize(card) ? Remember this is a http response, no such thing as objects.

[bernatfortet]

It's working for me now: with EJSON.stringify

Nonetheless, it's not really good, since the request might take too long and miss the timeout. Is there any better way to do this, and be efficient with respone timing?

Thanks!

here is the working code, just in case somebody needs it.

Meteor.Router.add(
    "/api/v1/cards/:id.json", ( cardId ) ->

        future = new Future();
        card = {}

        tutor.card( +cardId, ( err, respone ) =>
            console.log respone
            card = respone
        )

        Meteor.setTimeout( =>
            console.log card
            return future.return( EJSON.stringify(card) )
        , 2000)

        return future.wait();

)

[tmeasday]

Just do the future.return() in the callback for tutor.card()

[bernatfortet]

Got it!

It works like a charm!

Here is the code just in case somebody needs it.

Meteor.Router.add(
    "/api/v1/cards/:id.json", ( cardId ) ->
        future = new Future();
        tutor.card( +cardId, ( err, card ) =>
            future.return( EJSON.stringify(card) )
        )
        return future.wait();
)

Thanks @tmeasday !