@push.rocks/smartstream
Version:
A library to simplify the creation and manipulation of Node.js streams, providing utilities for handling transform, duplex, and readable/writable streams effectively in TypeScript.
74 lines • 4.65 kB
JavaScript
import * as plugins from './smartstream.plugins.js';
// interfaces
import { Transform } from 'stream';
/**
* class Smartstream handles
*/
export class StreamWrapper {
/**
* constructor
*/
constructor(streamArrayArg) {
this.streamArray = [];
this.customEventObjectArray = [];
this.streamStartedDeferred = plugins.smartpromise.defer();
this.streamArray = streamArrayArg;
}
/**
* make something with the stream itself
*/
streamStarted() {
return this.streamStartedDeferred.promise;
}
/**
* attach listener to custom event
*/
onCustomEvent(eventNameArg, eventFunctionArg) {
this.customEventObjectArray.push({
eventName: eventNameArg,
eventFunction: eventFunctionArg,
});
}
/**
* run the stream
* @returns Promise
*/
run() {
const done = plugins.smartpromise.defer();
// clone Array
const streamExecutionArray = [];
for (const streamItem of this.streamArray) {
streamExecutionArray.push(streamItem);
}
// combine the stream
let finalStream = null;
let firstIteration = true;
for (const stream of streamExecutionArray) {
if (firstIteration === true) {
finalStream = stream;
}
stream.on('error', (err) => {
done.reject(err);
});
for (const customEventObject of this.customEventObjectArray) {
stream.on(customEventObject.eventName, customEventObject.eventFunction);
}
if (!firstIteration) {
finalStream = finalStream.pipe(stream);
}
firstIteration = false;
}
this.streamStartedDeferred.resolve();
finalStream.on('end', () => {
done.resolve();
});
finalStream.on('close', () => {
done.resolve();
});
finalStream.on('finish', () => {
done.resolve();
});
return done.promise;
}
}
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