Created
October 20, 2017 02:36
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Transform a node stream into an rxjs Observer
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import { Observable } from 'rxjs'; | |
// Adapted from https://github.com/Reactive-Extensions/rx-node/blob/87589c07be626c32c842bdafa782fca5924e749c/index.js#L52 | |
export default function fromStream(stream, finishEventName = 'end', dataEventName = 'data') { | |
stream.pause(); | |
return new Observable((observer) => { | |
function dataHandler(data) { | |
observer.next(data); | |
} | |
function errorHandler(err) { | |
observer.error(err); | |
} | |
function endHandler() { | |
observer.complete(); | |
} | |
stream.addListener(dataEventName, dataHandler); | |
stream.addListener('error', errorHandler); | |
stream.addListener(finishEventName, endHandler); | |
stream.resume(); | |
return () => { | |
stream.removeListener(dataEventName, dataHandler); | |
stream.removeListener('error', errorHandler); | |
stream.removeListener(finishEventName, endHandler); | |
}; | |
}).share(); | |
} |
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