502 lines
13 KiB
TypeScript
502 lines
13 KiB
TypeScript
const test = require("ava");
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const { expect } = require("chai");
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const { compose, map } = require("../src");
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const { sleep } = require("../src/helpers");
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import { performance } from "perf_hooks";
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test.cb("compose() chains two streams together in the correct order", t => {
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t.plan(3);
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interface Chunk {
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visited: number[];
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key: string;
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}
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let i = 0;
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const first = map((chunk: Chunk) => {
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chunk.visited.push(1);
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return chunk;
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});
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const second = map((chunk: Chunk) => {
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chunk.visited.push(2);
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return chunk;
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});
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const composed = compose(
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[first, second],
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{ objectMode: true },
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);
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composed.on("data", data => {
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expect(data).to.deep.equal(result[i]);
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t.pass();
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i++;
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if (i === 3) {
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t.end();
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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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composed.on("end", () => {
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t.end();
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});
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const input = [
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{ key: "a", visited: [] },
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{ key: "b", visited: [] },
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{ key: "c", visited: [] },
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];
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const result = [
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{ key: "a", visited: [1, 2] },
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{ key: "b", visited: [1, 2] },
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{ key: "c", visited: [1, 2] },
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];
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input.forEach(item => composed.write(item));
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});
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test.cb("piping compose() maintains correct order", t => {
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t.plan(3);
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interface Chunk {
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visited: number[];
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key: string;
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}
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let i = 0;
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const first = map((chunk: Chunk) => {
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chunk.visited.push(1);
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return chunk;
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});
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const second = map((chunk: Chunk) => {
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chunk.visited.push(2);
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return chunk;
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});
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const composed = compose(
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[first, second],
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{ objectMode: true },
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);
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const third = map((chunk: Chunk) => {
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chunk.visited.push(3);
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return chunk;
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});
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composed.pipe(third).on("data", data => {
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expect(data).to.deep.equal(result[i]);
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t.pass();
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i++;
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if (i === 3) {
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t.end();
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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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const input = [
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{ key: "a", visited: [] },
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{ key: "b", visited: [] },
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{ key: "c", visited: [] },
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];
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const result = [
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{ key: "a", visited: [1, 2, 3] },
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{ key: "b", visited: [1, 2, 3] },
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{ key: "c", visited: [1, 2, 3] },
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];
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input.forEach(item => composed.write(item));
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});
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test("compose() writable length should be less than highWaterMark when handing writes", async t => {
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t.plan(7);
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return new Promise(async (resolve, reject) => {
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interface Chunk {
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key: string;
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mapped: number[];
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}
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const first = map(
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async (chunk: Chunk) => {
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chunk.mapped.push(1);
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return chunk;
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},
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{
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objectMode: true,
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},
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);
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const second = map(
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async (chunk: Chunk) => {
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chunk.mapped.push(2);
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return chunk;
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},
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{ objectMode: true },
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);
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const composed = compose(
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[first, second],
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{ objectMode: true, highWaterMark: 2 },
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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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composed.on("drain", () => {
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t.pass();
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expect(composed._writableState.length).to.be.equal(0);
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});
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composed.on("data", (chunk: Chunk) => {
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if (chunk.key === "e") {
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resolve();
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}
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});
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const input = [
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{ key: "a", mapped: [] },
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{ key: "b", mapped: [] },
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{ key: "c", mapped: [] },
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{ key: "d", mapped: [] },
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{ key: "e", mapped: [] },
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];
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for (const item of input) {
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const res = composed.write(item);
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expect(composed._writableState.length).to.be.at.most(2);
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t.pass();
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if (!res) {
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await sleep(10);
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}
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}
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});
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});
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test("compose() should emit drain event ~rate * highWaterMark ms for every write that causes backpressure", async t => {
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t.plan(7);
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const _rate = 25;
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return new Promise(async (resolve, reject) => {
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interface Chunk {
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key: string;
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mapped: number[];
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}
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const first = map(
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async (chunk: Chunk) => {
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await sleep(_rate);
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chunk.mapped.push(1);
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return chunk;
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},
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{
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objectMode: true,
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},
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);
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const second = map(
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async (chunk: Chunk) => {
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chunk.mapped.push(2);
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return chunk;
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},
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{ objectMode: true },
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);
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const composed = compose(
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[first, second],
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{ objectMode: true, highWaterMark: 2 },
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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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composed.on("drain", () => {
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t.pass();
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expect(composed._writableState.length).to.be.equal(0);
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expect(performance.now() - start).to.be.greaterThan(_rate);
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});
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composed.on("data", (chunk: Chunk) => {
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if (chunk.key === "e") {
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resolve();
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}
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});
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const input = [
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{ key: "a", mapped: [] },
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{ key: "b", mapped: [] },
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{ key: "c", mapped: [] },
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{ key: "d", mapped: [] },
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{ key: "e", mapped: [] },
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];
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let start = performance.now();
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for (const item of input) {
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const res = composed.write(item);
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expect(composed._writableState.length).to.be.at.most(2);
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t.pass();
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if (!res) {
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start = performance.now();
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await sleep(100);
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}
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}
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});
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});
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test.cb(
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"compose() should emit drain event after 500 ms when writing 5 items that take 100ms to process with a highWaterMark of 5 ",
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t => {
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t.plan(6);
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const _rate = 100;
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interface Chunk {
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key: string;
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mapped: number[];
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}
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const first = map(
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async (chunk: Chunk) => {
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await sleep(_rate);
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chunk.mapped.push(1);
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return chunk;
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},
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{
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objectMode: true,
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},
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);
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const second = map(
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async (chunk: Chunk) => {
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chunk.mapped.push(2);
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return chunk;
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},
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{ objectMode: true },
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);
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const composed = compose(
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[first, second],
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{ objectMode: true, highWaterMark: 5 },
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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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composed.on("drain", () => {
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expect(composed._writableState.length).to.be.equal(0);
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expect(performance.now() - start).to.be.greaterThan(
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_rate * input.length,
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);
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t.pass();
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});
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composed.on("data", (chunk: Chunk) => {
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t.pass();
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if (chunk.key === "e") {
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t.end();
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}
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});
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const input = [
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{ key: "a", mapped: [] },
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{ key: "b", mapped: [] },
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{ key: "c", mapped: [] },
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{ key: "d", mapped: [] },
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{ key: "e", mapped: [] },
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];
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input.forEach(item => {
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composed.write(item);
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});
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const start = performance.now();
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},
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);
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test.cb(
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"compose() should emit drain event immediately when second stream is bottleneck",
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t => {
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t.plan(6);
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interface Chunk {
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key: string;
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mapped: number[];
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}
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const first = map(
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async (chunk: Chunk) => {
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chunk.mapped.push(1);
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return chunk;
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},
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{
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objectMode: true,
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},
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);
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const second = map(
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async (chunk: Chunk) => {
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pendingReads--;
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await sleep(200);
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expect(second._writableState.length).to.be.equal(1);
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expect(first._readableState.length).to.equal(pendingReads);
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chunk.mapped.push(2);
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return chunk;
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},
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{ objectMode: true, highWaterMark: 1 },
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);
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const composed = compose(
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[first, second],
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{ objectMode: true, highWaterMark: 5 },
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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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composed.on("drain", () => {
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expect(composed._writableState.length).to.be.equal(0);
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expect(performance.now() - start).to.be.lessThan(50);
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t.pass();
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});
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composed.on("data", (chunk: Chunk) => {
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// Since second is bottleneck, composed will write into first immediately. Buffer should be empty.
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expect(composed._writableState.length).to.be.equal(0);
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t.pass();
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if (chunk.key === "e") {
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t.end();
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}
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});
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const input = [
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{ key: "a", mapped: [] },
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{ key: "b", mapped: [] },
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{ key: "c", mapped: [] },
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{ key: "d", mapped: [] },
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{ key: "e", mapped: [] },
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];
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let pendingReads = input.length;
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input.forEach(item => {
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composed.write(item);
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});
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const start = performance.now();
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},
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);
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test.cb(
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"compose() should emit drain event and first should contain up to highWaterMark items in readable state when second is bottleneck",
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t => {
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t.plan(6);
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interface Chunk {
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index: number;
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mapped: string[];
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}
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const first = map(
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async (chunk: Chunk) => {
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expect(first._readableState.length).to.be.at.most(2);
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chunk.mapped.push("first");
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return chunk;
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},
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{
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objectMode: true,
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highWaterMark: 2,
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},
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);
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const second = map(
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async (chunk: Chunk) => {
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expect(second._writableState.length).to.be.equal(1);
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await sleep(100);
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chunk.mapped.push("second");
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return chunk;
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},
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{ objectMode: true, highWaterMark: 2 },
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);
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const composed = compose(
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[first, second],
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{ objectMode: true, highWaterMark: 5 },
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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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composed.on("data", (chunk: Chunk) => {
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expect(chunk.mapped.length).to.equal(2);
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expect(chunk.mapped).to.deep.equal(["first", "second"]);
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t.pass();
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if (chunk.index === 5) {
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t.end();
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}
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});
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composed.on("drain", () => {
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expect(composed._writableState.length).to.be.equal(0);
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t.pass();
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});
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const input = [
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{ index: 1, mapped: [] },
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{ index: 2, mapped: [] },
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{ index: 3, mapped: [] },
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{ index: 4, mapped: [] },
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{ index: 5, mapped: [] },
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];
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input.forEach(item => {
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composed.write(item);
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});
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},
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);
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test.cb(
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"compose() should not emit drain event writing 5 items to compose with a highWaterMark of 6",
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t => {
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t.plan(5);
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const _rate = 100;
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interface Chunk {
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key: string;
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mapped: number[];
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}
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const first = map(
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async (chunk: Chunk) => {
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await sleep(_rate);
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chunk.mapped.push(1);
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return chunk;
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},
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{
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objectMode: true,
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},
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);
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const second = map(
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async (chunk: Chunk) => {
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chunk.mapped.push(2);
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return chunk;
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},
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{ objectMode: true },
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);
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const composed = compose(
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[first, second],
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{ objectMode: true, highWaterMark: 6 },
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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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composed.on("drain", () => {
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t.end(new Error("Drain should not be emitted"));
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});
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composed.on("data", (chunk: Chunk) => {
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t.pass();
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if (chunk.key === "e") {
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t.end();
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}
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});
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const input = [
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{ key: "a", mapped: [] },
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{ key: "b", mapped: [] },
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{ key: "c", mapped: [] },
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{ key: "d", mapped: [] },
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{ key: "e", mapped: [] },
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];
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input.forEach(item => {
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composed.write(item);
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});
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},
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);
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