Promise interface?

[ericclemmons]

I haven't been able to use https://github.com/sindresorhus/pify successfully with this library (this binding issues?), but I was wondering if, in absence of a callback, method calls could return a Promise so that we can use async & await.

Sounds cool, right!? ;)

[dlau]

Hi Eric, thanks for your report. I'm looking into your issue with using https://github.com/sindresorhus/pify .

Will discuss with the team about a promise interface. At first glance, it sounds like a great feature enhancement.

[dlau]

Hi Eric,

With regard to your issue using https://github.com/sindresorhus/pify, we use this internally in our library, you can use our library functions by explicitly binding the instance to the function you pass to pify:

Callback style:

ld_client.variation.("myflag", user, false, (err, show_feature) => {
...
}

Wrapped in pify:

pify(ld_client.variation.bind(ld_client))("myflag", user, false).then(show_feature => {
...
})

Link to related issue in pify repo:
sindresorhus/pify#23

[apucacao]

Hi @ericclemmons ,

I wanted to let you know we finally released version 3.1.0 in which asynchronous methods return a Promise. The callbacks for those methods are now entirely optional.

Let me know if you have any questions or feedback. :)

Best,
Alexis

[yamoo]

Hi @apucacao,
I have tried Promise way with variation method but I couldn't receive the flag value on the args of then. It returns undefined. I also checked the promise value returned by the variation method with console.log. It shows Promise { undefined } on my terminal. Do you have any advices for that? I'm using Node v8.7.0 and ldclient-node v3.3.0.

client.waitUntilReady().then(() => {
 var promiss = client.variation("flag", user, false)
 promiss.then((value) => {
 console.log(promiss, value); // Promise { undefined } undefined
 });
});

Thank you.

[apucacao]

Hi @yamoo !

Sorry about that — there's a bug in the the code. I filed #75 and we'll release a bug fix version shortly.

I'll let you know once I've released the fix.

Thanks for your patience!
Alexis

[apucacao]

@yamoo I just released version 3.3.1 which includes a fix for the bug you found. Thanks for reporting it and sorry for the inconvenience!

[yamoo]

@apucacao Thank you for the quick response! I could confirm it was fixed by upgrading to v3.3.1.