Merge pull request #4 from Jogogoplay/feature/demux-pipe
Allow demux to be piped ie muxed
This commit is contained in:
Lewis Diamond
GitHub
commit
2841f4e182
@ -1,4 +1,5 @@
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import { pipeline, TransformOptions, Transform } from "stream";
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import { AllStreams, isReadable } from "../helpers";
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export function compose(
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streams: Array<
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@ -21,18 +22,6 @@ enum EventSubscription {
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Self,
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}
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type AllStreams =
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| NodeJS.ReadableStream
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| NodeJS.ReadWriteStream
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| NodeJS.WritableStream;
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function isReadable(stream: AllStreams): stream is NodeJS.WritableStream {
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return (
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(stream as NodeJS.ReadableStream).pipe !== undefined &&
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(stream as any).readable === true
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);
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}
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export class Compose extends Transform {
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private first: AllStreams;
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private last: AllStreams;
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@ -1,4 +1,6 @@
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import { WritableOptions, Writable } from "stream";
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import { DuplexOptions, Duplex, Transform, Writable } from "stream";
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import { isReadable } from "../helpers";
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enum EventSubscription {
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Last = 0,
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@ -8,54 +10,67 @@ enum EventSubscription {
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Unhandled,
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}
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const eventsTarget = {
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close: EventSubscription.Self,
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data: EventSubscription.All,
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drain: EventSubscription.Self,
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end: EventSubscription.Self,
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error: EventSubscription.Self,
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finish: EventSubscription.Self,
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pause: EventSubscription.Self,
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pipe: EventSubscription.Self,
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readable: EventSubscription.Self,
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resume: EventSubscription.Self,
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unpipe: EventSubscription.Self,
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};
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type DemuxStreams = NodeJS.WritableStream | NodeJS.ReadWriteStream;
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interface DemuxOptions extends DuplexOptions {
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remultiplex?: boolean;
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}
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export function demux(
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construct: (destKey?: string) => DemuxStreams,
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demuxBy: string | ((chunk: any) => string),
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options?: WritableOptions,
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): Writable {
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options?: DemuxOptions,
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): Duplex {
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return new Demux(construct, demuxBy, options);
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}
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// @TODO handle pipe event ie) Multiplex
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class Demux extends Writable {
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class Demux extends Duplex {
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private streamsByKey: {
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[key: string]: DemuxStreams;
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};
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private demuxer: (chunk: any) => string;
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private construct: (destKey?: string) => DemuxStreams;
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private remultiplex: boolean;
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private transform: Transform;
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constructor(
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construct: (destKey?: string) => DemuxStreams,
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demuxBy: string | ((chunk: any) => string),
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options: WritableOptions = {},
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options: DemuxOptions = {},
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) {
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super(options);
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this.demuxer =
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typeof demuxBy === "string" ? chunk => chunk[demuxBy] : demuxBy;
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this.construct = construct;
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this.remultiplex =
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options.remultiplex === undefined ? true : options.remultiplex;
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this.streamsByKey = {};
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this.transform = new Transform({
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...options,
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transform: (d, _, cb) => {
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this.push(d);
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cb(null);
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},
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});
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this.on("unpipe", () => this._flush());
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}
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public _read(size: number) {}
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public async _write(chunk: any, encoding: any, cb: any) {
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const destKey = this.demuxer(chunk);
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if (this.streamsByKey[destKey] === undefined) {
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this.streamsByKey[destKey] = await this.construct(destKey);
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const newPipeline = await this.construct(destKey);
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this.streamsByKey[destKey] = newPipeline;
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if (this.remultiplex && isReadable(newPipeline)) {
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(newPipeline as NodeJS.ReadWriteStream).pipe(this.transform);
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} else if (this.remultiplex) {
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console.error(
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`Pipeline construct for ${destKey} does not implement readable interface`,
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);
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}
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}
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if (!this.streamsByKey[destKey].write(chunk, encoding)) {
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this.streamsByKey[destKey].once("drain", () => {
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cb();
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@ -65,35 +80,24 @@ class Demux extends Writable {
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}
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}
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public on(event: string, cb: any) {
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switch (eventsTarget[event]) {
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case EventSubscription.Self:
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super.on(event, cb);
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break;
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case EventSubscription.All:
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Object.keys(this.streamsByKey).forEach(key =>
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this.streamsByKey[key].on(event, cb),
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);
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break;
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default:
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super.on(event, cb);
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}
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return this;
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public _flush() {
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const pipelines = Object.values(this.streamsByKey);
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let totalEnded = 0;
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pipelines.forEach(pipeline => {
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pipeline.once("end", () => {
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totalEnded++;
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if (pipelines.length === totalEnded) {
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this.push(null);
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this.emit("end");
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}
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});
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});
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pipelines.forEach(pipeline => pipeline.end());
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}
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public once(event: string, cb: any) {
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switch (eventsTarget[event]) {
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case EventSubscription.Self:
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super.once(event, cb);
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break;
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case EventSubscription.All:
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Object.keys(this.streamsByKey).forEach(key =>
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this.streamsByKey[key].once(event, cb),
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);
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break;
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default:
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super.once(event, cb);
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}
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return this;
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public _destroy(error: any, cb: (error?: any) => void) {
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const pipelines = Object.values(this.streamsByKey);
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pipelines.forEach(p => (p as any).destroy());
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cb(error);
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}
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}
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@ -1,3 +1,17 @@
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export async function sleep(time: number): Promise<{} | null> {
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return time > 0 ? new Promise(resolve => setTimeout(resolve, time)) : null;
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}
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export type AllStreams =
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| NodeJS.ReadableStream
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| NodeJS.ReadWriteStream
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| NodeJS.WritableStream;
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export function isReadable(
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stream: AllStreams,
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): stream is NodeJS.WritableStream {
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return (
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(stream as NodeJS.ReadableStream).pipe !== undefined &&
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(stream as any).readable === true
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);
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}
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@ -114,9 +114,13 @@ test("compose() writable length should be less than highWaterMark when handing w
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return chunk;
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});
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const composed = compose([first, second], undefined, {
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highWaterMark: 2,
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});
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const composed = compose(
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[first, second],
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undefined,
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{
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highWaterMark: 2,
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},
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);
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composed.on("error", err => {
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reject();
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});
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@ -171,9 +175,13 @@ test("compose() should emit drain event ~rate * highWaterMark ms for every write
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return chunk;
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});
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const composed = compose([first, second], undefined, {
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highWaterMark,
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});
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const composed = compose(
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[first, second],
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undefined,
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{
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highWaterMark,
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},
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);
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composed.on("error", err => {
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reject();
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});
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@ -237,9 +245,13 @@ test.cb(
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return chunk;
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});
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const composed = compose([first, second], undefined, {
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highWaterMark: 5,
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});
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const composed = compose(
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[first, second],
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undefined,
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{
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highWaterMark: 5,
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},
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);
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composed.on("error", err => {
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t.end(err);
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@ -301,9 +313,13 @@ test.cb(
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{ highWaterMark: 1 },
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);
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const composed = compose([first, second], undefined, {
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highWaterMark: 5,
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});
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const composed = compose(
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[first, second],
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undefined,
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{
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highWaterMark: 5,
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},
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);
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composed.on("error", err => {
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t.end(err);
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});
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@ -368,9 +384,13 @@ test.cb(
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{ highWaterMark: 2 },
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);
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const composed = compose([first, second], undefined, {
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highWaterMark: 5,
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});
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const composed = compose(
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[first, second],
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undefined,
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{
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highWaterMark: 5,
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},
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);
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composed.on("error", err => {
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t.end(err);
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});
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@ -423,9 +443,13 @@ test.cb(
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return chunk;
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});
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const composed = compose([first, second], undefined, {
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highWaterMark: 6,
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});
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const composed = compose(
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[first, second],
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undefined,
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{
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highWaterMark: 6,
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},
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);
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composed.on("error", err => {
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t.end(err);
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@ -475,9 +499,12 @@ test.cb("compose() should be 'destroyable'", t => {
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return chunk;
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});
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const composed = compose([first, second], (err: any) => {
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t.pass();
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});
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const composed = compose(
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[first, second],
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(err: any) => {
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t.pass();
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},
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);
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const fakeSource = new Readable({
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objectMode: true,
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@ -533,9 +560,13 @@ test.cb("compose() `finish` and `end` propagates", t => {
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return chunk;
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});
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const composed = compose([first, second], undefined, {
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highWaterMark: 3,
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});
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const composed = compose(
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[first, second],
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undefined,
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{
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highWaterMark: 3,
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},
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);
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const fakeSource = new Readable({
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objectMode: true,
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@ -1,11 +1,11 @@
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import test from "ava";
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import { expect } from "chai";
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import mhysa from "../src";
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import { Writable } from "stream";
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import { Writable, Readable } from "stream";
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const sinon = require("sinon");
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const { sleep } = require("../src/helpers");
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import { performance } from "perf_hooks";
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const { demux, map } = mhysa();
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const { demux, map, fromArray } = mhysa({ objectMode: true });
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interface Test {
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key: string;
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@ -31,7 +31,7 @@ test.cb("demux() constructor should be called once per key", t => {
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return dest;
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});
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const demuxed = demux(construct, "key", { objectMode: true });
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const demuxed = demux(construct, "key", {});
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demuxed.on("finish", () => {
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expect(construct.withArgs("a").callCount).to.equal(1);
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@ -41,8 +41,7 @@ test.cb("demux() constructor should be called once per key", t => {
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t.end();
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});
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input.forEach(event => demuxed.write(event));
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demuxed.end();
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fromArray(input).pipe(demuxed);
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});
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test.cb("demux() should send input through correct pipeline", t => {
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@ -66,7 +65,7 @@ test.cb("demux() should send input through correct pipeline", t => {
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return dest;
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};
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const demuxed = demux(construct, "key", { objectMode: true });
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const demuxed = demux(construct, "key", {});
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demuxed.on("finish", () => {
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pipelineSpies["a"].getCalls().forEach(call => {
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@ -84,8 +83,7 @@ test.cb("demux() should send input through correct pipeline", t => {
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t.end();
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});
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input.forEach(event => demuxed.write(event));
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demuxed.end();
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fromArray(input).pipe(demuxed);
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});
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test.cb("demux() constructor should be called once per key using keyBy", t => {
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@ -108,7 +106,7 @@ test.cb("demux() constructor should be called once per key using keyBy", t => {
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return dest;
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});
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const demuxed = demux(construct, item => item.key, { objectMode: true });
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const demuxed = demux(construct, item => item.key, {});
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demuxed.on("finish", () => {
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expect(construct.withArgs("a").callCount).to.equal(1);
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@ -118,8 +116,7 @@ test.cb("demux() constructor should be called once per key using keyBy", t => {
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t.end();
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});
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input.forEach(event => demuxed.write(event));
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demuxed.end();
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fromArray(input).pipe(demuxed);
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});
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test.cb("demux() should send input through correct pipeline using keyBy", t => {
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@ -143,7 +140,7 @@ test.cb("demux() should send input through correct pipeline using keyBy", t => {
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return dest;
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};
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const demuxed = demux(construct, item => item.key, { objectMode: true });
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const demuxed = demux(construct, item => item.key, {});
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demuxed.on("finish", () => {
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pipelineSpies["a"].getCalls().forEach(call => {
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@ -161,11 +158,10 @@ test.cb("demux() should send input through correct pipeline using keyBy", t => {
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t.end();
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});
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input.forEach(event => demuxed.write(event));
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demuxed.end();
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fromArray(input).pipe(demuxed);
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});
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test("demux() write should return false after if it has >= highWaterMark items buffered and drain should be emitted", t => {
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test("demux() write should return false and emit drain if more than highWaterMark items are buffered", t => {
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return new Promise(async (resolve, reject) => {
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t.plan(7);
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interface Chunk {
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@ -189,7 +185,7 @@ test("demux() write should return false after if it has >= highWaterMark items b
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await sleep(slowProcessorSpeed);
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return { ...chunk, mapped: [1] };
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},
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{ highWaterMark: 1, objectMode: true },
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{ highWaterMark: 1 },
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);
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first.on("data", chunk => {
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@ -205,7 +201,6 @@ test("demux() write should return false after if it has >= highWaterMark items b
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};
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const _demux = demux(construct, "key", {
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objectMode: true,
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highWaterMark,
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});
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@ -229,7 +224,7 @@ test("demux() write should return false after if it has >= highWaterMark items b
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});
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});
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test("demux() should emit one drain event after slowProcessorSpeed * highWaterMark ms", t => {
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test("demux() should emit one drain event after slowProcessorSpeed * highWaterMark ms when first stream is bottleneck", t => {
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return new Promise(async (resolve, reject) => {
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t.plan(7);
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interface Chunk {
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@ -255,7 +250,7 @@ test("demux() should emit one drain event after slowProcessorSpeed * highWaterMa
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chunk.mapped.push(1);
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return chunk;
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},
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{ highWaterMark: 1, objectMode: true },
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{ highWaterMark: 1 },
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);
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first.on("data", () => {
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@ -268,7 +263,6 @@ test("demux() should emit one drain event after slowProcessorSpeed * highWaterMa
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return first;
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};
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const _demux = demux(construct, "key", {
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objectMode: true,
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highWaterMark,
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});
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_demux.on("error", err => {
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@ -296,7 +290,7 @@ test("demux() should emit one drain event after slowProcessorSpeed * highWaterMa
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test("demux() should emit one drain event when writing 6 items with highWaterMark of 5", t => {
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return new Promise(async (resolve, reject) => {
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t.plan(7);
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t.plan(1);
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interface Chunk {
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key: string;
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mapped: number[];
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@ -318,12 +312,11 @@ test("demux() should emit one drain event when writing 6 items with highWaterMar
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chunk.mapped.push(2);
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return chunk;
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},
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{ highWaterMark: 1, objectMode: true },
|
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{ highWaterMark: 1 },
|
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);
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first.on("data", () => {
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pendingReads--;
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t.pass();
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if (pendingReads === 0) {
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resolve();
|
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}
|
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@ -331,7 +324,6 @@ test("demux() should emit one drain event when writing 6 items with highWaterMar
|
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return first;
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};
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const _demux = demux(construct, "key", {
|
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objectMode: true,
|
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highWaterMark: 5,
|
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});
|
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|
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@ -355,9 +347,10 @@ test("demux() should emit one drain event when writing 6 items with highWaterMar
|
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});
|
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});
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|
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test.cb.only(
|
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"demux() should emit drain event when third stream is bottleneck",
|
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test.cb(
|
||||
"demux() should emit drain event when second stream is bottleneck after (highWaterMark - 2) * slowProcessorSpeed ms",
|
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t => {
|
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// ie) first two items are pushed directly into first and second streams (highWaterMark - 2 remain in demux)
|
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t.plan(8);
|
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const slowProcessorSpeed = 100;
|
||||
const highWaterMark = 5;
|
||||
@ -383,7 +376,7 @@ test.cb.only(
|
||||
chunk.mapped.push(1);
|
||||
return chunk;
|
||||
},
|
||||
{ objectMode: true, highWaterMark: 1 },
|
||||
{ highWaterMark: 1 },
|
||||
);
|
||||
|
||||
const second = map(
|
||||
@ -392,25 +385,23 @@ test.cb.only(
|
||||
chunk.mapped.push(2);
|
||||
return chunk;
|
||||
},
|
||||
{ objectMode: true, highWaterMark: 1 },
|
||||
{ highWaterMark: 1 },
|
||||
);
|
||||
|
||||
first.pipe(second).pipe(sink);
|
||||
return first;
|
||||
};
|
||||
const _demux = demux(construct, () => "a", {
|
||||
objectMode: true,
|
||||
highWaterMark,
|
||||
});
|
||||
_demux.on("error", err => {
|
||||
t.end(err);
|
||||
});
|
||||
|
||||
// This event should be received after at least 5 * slowProcessorSpeed (two are read immediately by first and second, 5 remaining in demux before drain event)
|
||||
_demux.on("drain", () => {
|
||||
expect(_demux._writableState.length).to.be.equal(0);
|
||||
expect(performance.now() - start).to.be.greaterThan(
|
||||
slowProcessorSpeed * (input.length - 2),
|
||||
slowProcessorSpeed * 3,
|
||||
);
|
||||
t.pass();
|
||||
});
|
||||
@ -427,15 +418,14 @@ test.cb.only(
|
||||
let pendingReads = input.length;
|
||||
|
||||
const start = performance.now();
|
||||
input.forEach(item => {
|
||||
_demux.write(item);
|
||||
});
|
||||
fromArray(input).pipe(_demux);
|
||||
},
|
||||
);
|
||||
|
||||
test.cb(
|
||||
"demux() should emit drain event when second stream is bottleneck",
|
||||
"demux() should emit drain event when third stream is bottleneck",
|
||||
t => {
|
||||
// @TODO investigate why drain is emitted after slowProcessorSpeed
|
||||
t.plan(8);
|
||||
const slowProcessorSpeed = 100;
|
||||
const highWaterMark = 5;
|
||||
@ -446,7 +436,7 @@ test.cb(
|
||||
const sink = new Writable({
|
||||
objectMode: true,
|
||||
write(chunk, encoding, cb) {
|
||||
expect(chunk.mapped).to.deep.equal([1, 2]);
|
||||
expect(chunk.mapped).to.deep.equal([1, 2, 3]);
|
||||
t.pass();
|
||||
pendingReads--;
|
||||
if (pendingReads === 0) {
|
||||
@ -461,14 +451,14 @@ test.cb(
|
||||
chunk.mapped.push(1);
|
||||
return chunk;
|
||||
},
|
||||
{ objectMode: true, highWaterMark: 1 },
|
||||
{ highWaterMark: 1 },
|
||||
);
|
||||
const second = map(
|
||||
(chunk: Chunk) => {
|
||||
chunk.mapped.push(2);
|
||||
return chunk;
|
||||
},
|
||||
{ objectMode: true, highWaterMark: 1 },
|
||||
{ highWaterMark: 1 },
|
||||
);
|
||||
|
||||
const third = map(
|
||||
@ -477,7 +467,7 @@ test.cb(
|
||||
chunk.mapped.push(3);
|
||||
return chunk;
|
||||
},
|
||||
{ objectMode: true, highWaterMark: 1 },
|
||||
{ highWaterMark: 1 },
|
||||
);
|
||||
|
||||
first
|
||||
@ -487,18 +477,16 @@ test.cb(
|
||||
return first;
|
||||
};
|
||||
const _demux = demux(construct, () => "a", {
|
||||
objectMode: true,
|
||||
highWaterMark,
|
||||
});
|
||||
_demux.on("error", err => {
|
||||
t.end(err);
|
||||
});
|
||||
|
||||
// This event should be received after at least 3 * slowProcessorSpeed (two are read immediately by first and second, 3 remaining in demux before drain event)
|
||||
_demux.on("drain", () => {
|
||||
expect(_demux._writableState.length).to.be.equal(0);
|
||||
expect(performance.now() - start).to.be.greaterThan(
|
||||
slowProcessorSpeed * (input.length - 4),
|
||||
slowProcessorSpeed,
|
||||
);
|
||||
t.pass();
|
||||
});
|
||||
@ -515,9 +503,7 @@ test.cb(
|
||||
let pendingReads = input.length;
|
||||
|
||||
const start = performance.now();
|
||||
input.forEach(item => {
|
||||
_demux.write(item);
|
||||
});
|
||||
fromArray(input).pipe(_demux);
|
||||
},
|
||||
);
|
||||
|
||||
@ -536,36 +522,37 @@ test("demux() should be blocked by slowest pipeline", t => {
|
||||
chunk.mapped.push(1);
|
||||
return chunk;
|
||||
},
|
||||
{ objectMode: true, highWaterMark: 1 },
|
||||
{ highWaterMark: 1 },
|
||||
);
|
||||
|
||||
first.on("data", chunk => {
|
||||
pendingReads--;
|
||||
if (chunk.key === "b") {
|
||||
expect(performance.now() - start).to.be.greaterThan(
|
||||
slowProcessorSpeed * totalItems,
|
||||
);
|
||||
t.pass();
|
||||
expect(pendingReads).to.equal(0);
|
||||
resolve();
|
||||
}
|
||||
});
|
||||
return first;
|
||||
};
|
||||
|
||||
const _demux = demux(construct, "key", {
|
||||
objectMode: true,
|
||||
highWaterMark: 1,
|
||||
});
|
||||
|
||||
_demux.on("error", err => {
|
||||
reject(err);
|
||||
});
|
||||
|
||||
_demux.on("data", async chunk => {
|
||||
pendingReads--;
|
||||
if (chunk.key === "b") {
|
||||
expect(performance.now() - start).to.be.greaterThan(
|
||||
slowProcessorSpeed * totalItems,
|
||||
);
|
||||
t.pass();
|
||||
expect(pendingReads).to.equal(0);
|
||||
resolve();
|
||||
}
|
||||
});
|
||||
|
||||
const input = [
|
||||
{ key: "a", mapped: [] },
|
||||
{ key: "a", mapped: [] },
|
||||
{ key: "c", mapped: [] },
|
||||
{ key: "c", mapped: [] },
|
||||
{ key: "c", mapped: [] },
|
||||
{ key: "b", mapped: [] },
|
||||
];
|
||||
|
||||
@ -584,74 +571,266 @@ test("demux() should be blocked by slowest pipeline", t => {
|
||||
});
|
||||
});
|
||||
|
||||
test("demux() should emit drain event when second stream in pipeline is bottleneck", t => {
|
||||
t.plan(5);
|
||||
const highWaterMark = 3;
|
||||
return new Promise(async (resolve, reject) => {
|
||||
interface Chunk {
|
||||
key: string;
|
||||
mapped: number[];
|
||||
test.cb("Demux should remux to sink", t => {
|
||||
t.plan(6);
|
||||
let i = 0;
|
||||
const input = [
|
||||
{ key: "a", visited: [] },
|
||||
{ key: "b", visited: [] },
|
||||
{ key: "a", visited: [] },
|
||||
{ key: "c", visited: [] },
|
||||
{ key: "a", visited: [] },
|
||||
{ key: "b", visited: [] },
|
||||
];
|
||||
const result = [
|
||||
{ key: "a", visited: ["a"] },
|
||||
{ key: "b", visited: ["b"] },
|
||||
{ key: "a", visited: ["a"] },
|
||||
{ key: "c", visited: ["c"] },
|
||||
{ key: "a", visited: ["a"] },
|
||||
{ key: "b", visited: ["b"] },
|
||||
];
|
||||
const construct = (destKey: string) => {
|
||||
const dest = map((chunk: any) => {
|
||||
chunk.visited.push(destKey);
|
||||
return chunk;
|
||||
});
|
||||
|
||||
return dest;
|
||||
};
|
||||
|
||||
const sink = map(d => {
|
||||
t.deepEqual(d, result[i]);
|
||||
i++;
|
||||
if (i === input.length) {
|
||||
t.end();
|
||||
}
|
||||
const sink = new Writable({
|
||||
objectMode: true,
|
||||
write(chunk, encoding, cb) {
|
||||
expect(chunk.mapped).to.deep.equal([1, 2]);
|
||||
t.pass();
|
||||
cb();
|
||||
if (pendingReads === 0) {
|
||||
resolve();
|
||||
}
|
||||
},
|
||||
});
|
||||
|
||||
const demuxed = demux(construct, "key", {});
|
||||
|
||||
fromArray(input)
|
||||
.pipe(demuxed)
|
||||
.pipe(sink);
|
||||
});
|
||||
|
||||
test.cb("Demux should send data events", t => {
|
||||
t.plan(6);
|
||||
let i = 0;
|
||||
const input = [
|
||||
{ key: "a", visited: [] },
|
||||
{ key: "b", visited: [] },
|
||||
{ key: "a", visited: [] },
|
||||
{ key: "c", visited: [] },
|
||||
{ key: "a", visited: [] },
|
||||
{ key: "b", visited: [] },
|
||||
];
|
||||
const result = [
|
||||
{ key: "a", visited: ["a"] },
|
||||
{ key: "b", visited: ["b"] },
|
||||
{ key: "a", visited: ["a"] },
|
||||
{ key: "c", visited: ["c"] },
|
||||
{ key: "a", visited: ["a"] },
|
||||
{ key: "b", visited: ["b"] },
|
||||
];
|
||||
const construct = (destKey: string) => {
|
||||
const dest = map((chunk: any) => {
|
||||
chunk.visited.push(destKey);
|
||||
return chunk;
|
||||
});
|
||||
|
||||
const construct = (destKey: string) => {
|
||||
const first = map(
|
||||
(chunk: Chunk) => {
|
||||
expect(first._readableState.length).to.be.at.most(2);
|
||||
chunk.mapped.push(1);
|
||||
return chunk;
|
||||
},
|
||||
{ objectMode: true, highWaterMark: 2 },
|
||||
);
|
||||
return dest;
|
||||
};
|
||||
|
||||
const second = map(
|
||||
async (chunk: Chunk) => {
|
||||
await sleep(100);
|
||||
chunk.mapped.push(2);
|
||||
expect(second._writableState.length).to.be.equal(1);
|
||||
pendingReads--;
|
||||
return chunk;
|
||||
},
|
||||
{ objectMode: true, highWaterMark: 1 },
|
||||
);
|
||||
const demuxed = demux(construct, "key", {});
|
||||
|
||||
first.pipe(second).pipe(sink);
|
||||
return first;
|
||||
};
|
||||
fromArray(input).pipe(demuxed);
|
||||
|
||||
const _demux = demux(construct, "key", {
|
||||
objectMode: true,
|
||||
highWaterMark,
|
||||
});
|
||||
_demux.on("error", err => {
|
||||
reject();
|
||||
});
|
||||
|
||||
_demux.on("drain", () => {
|
||||
expect(_demux._writableState.length).to.be.equal(0);
|
||||
t.pass();
|
||||
});
|
||||
|
||||
const input = [
|
||||
{ key: "a", mapped: [] },
|
||||
{ key: "a", mapped: [] },
|
||||
{ key: "a", mapped: [] },
|
||||
{ key: "a", mapped: [] },
|
||||
];
|
||||
let pendingReads = input.length;
|
||||
|
||||
input.forEach(item => {
|
||||
_demux.write(item);
|
||||
});
|
||||
demuxed.on("data", d => {
|
||||
t.deepEqual(d, result[i]);
|
||||
i++;
|
||||
if (i === input.length) {
|
||||
t.end();
|
||||
}
|
||||
});
|
||||
});
|
||||
|
||||
test.cb("demux() `finish` and `end` propagates", t => {
|
||||
interface Chunk {
|
||||
key: string;
|
||||
mapped: number[];
|
||||
}
|
||||
|
||||
t.plan(9);
|
||||
|
||||
const construct = (destKey: string) => {
|
||||
const dest = map((chunk: any) => {
|
||||
chunk.mapped.push(destKey);
|
||||
return chunk;
|
||||
});
|
||||
return dest;
|
||||
};
|
||||
|
||||
const _demux = demux(construct, "key", {
|
||||
highWaterMark: 3,
|
||||
});
|
||||
|
||||
const fakeSource = new Readable({
|
||||
objectMode: true,
|
||||
read() {
|
||||
return;
|
||||
},
|
||||
});
|
||||
|
||||
const sink = map((d: any) => {
|
||||
const curr = input.shift();
|
||||
t.is(curr.key, d.key);
|
||||
t.deepEqual(d.mapped, [d.key]);
|
||||
});
|
||||
|
||||
fakeSource.pipe(_demux).pipe(sink);
|
||||
|
||||
fakeSource.on("end", () => {
|
||||
t.pass();
|
||||
});
|
||||
_demux.on("finish", () => {
|
||||
t.pass();
|
||||
});
|
||||
_demux.on("unpipe", () => {
|
||||
t.pass();
|
||||
});
|
||||
_demux.on("end", () => {
|
||||
t.pass();
|
||||
t.end();
|
||||
});
|
||||
sink.on("finish", () => {
|
||||
t.pass();
|
||||
});
|
||||
|
||||
const input = [
|
||||
{ key: "a", mapped: [] },
|
||||
{ key: "b", mapped: [] },
|
||||
{ key: "a", mapped: [] },
|
||||
{ key: "a", mapped: [] },
|
||||
{ key: "b", mapped: [] },
|
||||
];
|
||||
fakeSource.push(input[0]);
|
||||
fakeSource.push(input[1]);
|
||||
fakeSource.push(null);
|
||||
});
|
||||
|
||||
test.cb("demux() `unpipe` propagates", t => {
|
||||
interface Chunk {
|
||||
key: string;
|
||||
mapped: number[];
|
||||
}
|
||||
|
||||
t.plan(7);
|
||||
|
||||
const construct = (destKey: string) => {
|
||||
const dest = map((chunk: any) => {
|
||||
chunk.mapped.push(destKey);
|
||||
return chunk;
|
||||
});
|
||||
return dest;
|
||||
};
|
||||
|
||||
const _demux = demux(construct, "key", {
|
||||
highWaterMark: 3,
|
||||
});
|
||||
|
||||
const fakeSource = new Readable({
|
||||
objectMode: true,
|
||||
read() {
|
||||
return;
|
||||
},
|
||||
});
|
||||
|
||||
const sink = map((d: any) => {
|
||||
const curr = input.shift();
|
||||
t.is(curr.key, d.key);
|
||||
t.deepEqual(d.mapped, [d.key]);
|
||||
});
|
||||
|
||||
fakeSource.pipe(_demux).pipe(sink);
|
||||
|
||||
_demux.on("unpipe", () => {
|
||||
t.pass();
|
||||
});
|
||||
|
||||
sink.on("unpipe", () => {
|
||||
t.pass();
|
||||
});
|
||||
|
||||
sink.on("finish", () => {
|
||||
t.pass();
|
||||
t.end();
|
||||
});
|
||||
|
||||
const input = [
|
||||
{ key: "a", mapped: [] },
|
||||
{ key: "b", mapped: [] },
|
||||
{ key: "a", mapped: [] },
|
||||
{ key: "a", mapped: [] },
|
||||
{ key: "b", mapped: [] },
|
||||
];
|
||||
fakeSource.push(input[0]);
|
||||
fakeSource.push(input[1]);
|
||||
fakeSource.push(null);
|
||||
});
|
||||
|
||||
test.cb("demux() should be 'destroyable'", t => {
|
||||
t.plan(2);
|
||||
const _sleep = 100;
|
||||
interface Chunk {
|
||||
key: string;
|
||||
mapped: string[];
|
||||
}
|
||||
|
||||
const construct = (destKey: string) => {
|
||||
const first = map(async (chunk: Chunk) => {
|
||||
await sleep(_sleep);
|
||||
chunk.mapped.push(destKey);
|
||||
return chunk;
|
||||
});
|
||||
return first;
|
||||
};
|
||||
|
||||
const _demux = demux(construct, "key");
|
||||
|
||||
const fakeSource = new Readable({
|
||||
objectMode: true,
|
||||
read() {
|
||||
return;
|
||||
},
|
||||
});
|
||||
|
||||
const fakeSink = new Writable({
|
||||
objectMode: true,
|
||||
write(data, enc, cb) {
|
||||
const cur = input.shift();
|
||||
t.is(cur.key, data.key);
|
||||
t.deepEqual(cur.mapped, ["a"]);
|
||||
if (cur.key === "a") {
|
||||
_demux.destroy();
|
||||
}
|
||||
cb();
|
||||
},
|
||||
});
|
||||
|
||||
_demux.on("close", t.end);
|
||||
fakeSource.pipe(_demux).pipe(fakeSink);
|
||||
|
||||
const input = [
|
||||
{ key: "a", mapped: [] },
|
||||
{ key: "b", mapped: [] },
|
||||
{ key: "c", mapped: [] },
|
||||
{ key: "d", mapped: [] },
|
||||
{ key: "e", mapped: [] },
|
||||
];
|
||||
fakeSource.push(input[0]);
|
||||
fakeSource.push(input[1]);
|
||||
fakeSource.push(input[2]);
|
||||
fakeSource.push(input[3]);
|
||||
fakeSource.push(input[4]);
|
||||
});
|
||||
|
||||
Loading…
Reference in New Issue
Block a user