106 lines
2.2 KiB
TypeScript
106 lines
2.2 KiB
TypeScript
import * as plugins from './smartstream.plugins'
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// interfaces
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import { Transform } from 'stream'
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export interface IErrorFunction {
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(err): any
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}
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export interface ICustomEventFunction {
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(): any
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}
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export interface ICustomEventObject {
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eventName: string
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eventFunction: ICustomEventFunction
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}
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/**
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* class Smartstream handles
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*/
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export class Smartstream {
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private streamArray = []
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private customEventObjectArray: ICustomEventObject[] = []
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private streamStartedDeferred = plugins.q.defer()
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/**
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* constructor
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*/
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constructor(streamArrayArg: any[]) {
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this.streamArray = streamArrayArg
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}
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/**
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* make something with the stream itself
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*/
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streamStarted (): Promise<any> {
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return this.streamStartedDeferred.promise
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}
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/**
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* attach listener to custom event
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*/
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onCustomEvent (eventNameArg: string, eventFunctionArg: ICustomEventFunction) {
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this.customEventObjectArray.push({
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eventName: eventNameArg,
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eventFunction: eventFunctionArg
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})
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}
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/**
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* run the stream
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* @returns Promise
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*/
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run (): Promise<void> {
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let done = plugins.q.defer<void>()
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// clone Array
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let streamExecutionArray = []
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for (let streamItem of this.streamArray) { streamExecutionArray.push(streamItem) }
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// combine the stream
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let finalStream = null
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let firstIteration: boolean = true
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for (let stream of streamExecutionArray) {
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if (firstIteration === true) {
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finalStream = stream
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}
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stream.on('error', (err) => {
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done.reject(err)
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})
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for (let customEventObject of this.customEventObjectArray) {
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stream.on(customEventObject.eventName, customEventObject.eventFunction)
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}
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if (!firstIteration) {
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finalStream = finalStream.pipe(stream)
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}
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firstIteration = false
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}
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this.streamStartedDeferred.resolve()
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finalStream.on('end', function () {
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done.resolve()
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})
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finalStream.on('close', function () {
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done.resolve()
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})
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finalStream.on('finish', function () {
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done.resolve()
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})
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return done.promise
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}
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}
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export let cleanPipe = () => {
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return plugins.through2.obj(
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(file, enc, cb) => {
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cb()
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},
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(cb) => {
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cb()
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}
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)
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}
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