import * as plugins from './smartstream.plugins.js'; export class StreamIntake extends plugins.stream.Readable { private signalEndBoolean = false; private chunkStore: T[] = []; public pushNextObservable = new plugins.smartrx.ObservableIntake(); private pushedNextDeferred = plugins.smartpromise.defer(); constructor(options?: plugins.stream.ReadableOptions) { super({ ...options, objectMode: true }); // Ensure that we are in object mode. this.pushNextObservable.push('please push next'); } _read(size: number): void { // console.log('get next'); const pushChunk = (): void => { if (this.chunkStore.length > 0) { // If push returns false, then we should stop reading if (!this.push(this.chunkStore.shift())) { return; } } if (this.chunkStore.length === 0) { if (this.signalEndBoolean) { // If we're done, push null to signal the end of the stream this.push(null); } else { // Ask for more data and wait this.pushNextObservable.push('please push next'); this.pushedNextDeferred.promise.then(() => { this.pushedNextDeferred = plugins.smartpromise.defer(); // Reset the deferred pushChunk(); // Try pushing the next chunk }); } } }; pushChunk(); } public pushData(chunkData: T) { this.chunkStore.push(chunkData); this.pushedNextDeferred.resolve(); } public signalEnd() { this.signalEndBoolean = true; this.pushedNextDeferred.resolve(); this.pushNextObservable.signalComplete(); this.push(null); } }