Last active
August 29, 2015 14:21
-
-
Save kaosat-dev/bf21816d9e6f1dae218f to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// ES7 Observables + WHATWG Streams | |
// | |
// https://github.com/jhusain/asyncgenerator | |
// https://github.com/whatwg/streams | |
// | |
// Continuation from file: | |
// https://github.com/jhusain/asyncgenerator/blob/master/src/observable.js | |
Observable.fromStream = function(readable) { | |
return new Observable(function(generator) { | |
var done = false; | |
var decoratedGenerator = decorate(generator, function() { | |
if (!done) { | |
done = true; | |
readable.cancel(); | |
} | |
}); | |
function pump() { | |
var writableReady; | |
// Check done before each read, observer may have canceled on us | |
if (done) { | |
readable.cancel(); | |
return; | |
} | |
if (readable.state === "readable") { | |
// observer may signal backpressure by returning a promise | |
writableReady = decoratedGenerator.next(readable.read()); | |
} | |
if (readable.state === "closed") { | |
done = true; | |
decoratedGenerator.return(); | |
} else { | |
// Wait until both reader and writer are ready | |
Promise.all([readable.ready, writableReady]).then(pump, function(e) { | |
done = true; | |
readable.cancel(); | |
decoratedGenerator.throw(e); | |
}); | |
} | |
} | |
pump(); | |
return decoratedGenerator; | |
}); | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment