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