703 lines
20 KiB
TypeScript
703 lines
20 KiB
TypeScript
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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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({ objectMode: true });
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interface Test {
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key: string;
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visited: number[];
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}
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test.cb("demux() constructor should be called once per key", t => {
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t.plan(1);
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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: "a", visited: [] },
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{ key: "c", visited: [] },
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{ key: "a", visited: [] },
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{ key: "b", visited: [] },
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];
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const construct = sinon.spy((destKey: string) => {
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const dest = map((chunk: Test) => {
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chunk.visited.push(1);
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return chunk;
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});
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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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demuxed.on("finish", () => {
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expect(construct.withArgs("a").callCount).to.equal(1);
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expect(construct.withArgs("b").callCount).to.equal(1);
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expect(construct.withArgs("c").callCount).to.equal(1);
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t.pass();
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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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});
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test.cb("demux() should send input through correct pipeline", t => {
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t.plan(6);
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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: "a", visited: [] },
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{ key: "c", visited: [] },
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{ key: "a", visited: [] },
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{ key: "b", visited: [] },
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];
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const pipelineSpies = {};
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const construct = (destKey: string) => {
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const mapper = sinon.spy((chunk: Test) => {
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return { ...chunk, visited: [1] };
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});
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const dest = map(mapper);
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pipelineSpies[destKey] = mapper;
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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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demuxed.on("finish", () => {
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pipelineSpies["a"].getCalls().forEach(call => {
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expect(call.args[0].key).to.equal("a");
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t.pass();
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});
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pipelineSpies["b"].getCalls().forEach(call => {
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expect(call.args[0].key).to.equal("b");
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t.pass();
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});
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pipelineSpies["c"].getCalls().forEach(call => {
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expect(call.args[0].key).to.equal("c");
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t.pass();
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});
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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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});
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test.cb("demux() constructor should be called once per key using keyBy", t => {
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t.plan(1);
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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: "a", visited: [] },
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{ key: "c", visited: [] },
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{ key: "a", visited: [] },
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{ key: "b", visited: [] },
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];
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const construct = sinon.spy((destKey: string) => {
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const dest = map((chunk: Test) => {
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chunk.visited.push(1);
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return chunk;
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});
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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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demuxed.on("finish", () => {
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expect(construct.withArgs("a").callCount).to.equal(1);
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expect(construct.withArgs("b").callCount).to.equal(1);
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expect(construct.withArgs("c").callCount).to.equal(1);
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t.pass();
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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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});
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test.cb("demux() should send input through correct pipeline using keyBy", t => {
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t.plan(6);
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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: "a", visited: [] },
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{ key: "c", visited: [] },
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{ key: "a", visited: [] },
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{ key: "b", visited: [] },
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];
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const pipelineSpies = {};
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const construct = (destKey: string) => {
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const mapper = sinon.spy((chunk: Test) => {
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return { ...chunk, visited: [1] };
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});
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const dest = map(mapper);
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pipelineSpies[destKey] = mapper;
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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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demuxed.on("finish", () => {
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pipelineSpies["a"].getCalls().forEach(call => {
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expect(call.args[0].key).to.equal("a");
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t.pass();
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});
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pipelineSpies["b"].getCalls().forEach(call => {
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expect(call.args[0].key).to.equal("b");
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t.pass();
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});
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pipelineSpies["c"].getCalls().forEach(call => {
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expect(call.args[0].key).to.equal("c");
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t.pass();
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});
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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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});
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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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return new Promise(async (resolve, reject) => {
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t.plan(7);
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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 input: Chunk[] = [
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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];
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let pendingReads = input.length;
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const highWaterMark = 5;
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const slowProcessorSpeed = 25;
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const construct = (destKey: string) => {
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const first = map(
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async (chunk: Chunk) => {
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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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);
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first.on("data", chunk => {
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expect(chunk.mapped).to.deep.equal([1]);
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pendingReads--;
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if (pendingReads === 0) {
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resolve();
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}
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t.pass();
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});
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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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reject();
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});
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for (const item of input) {
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const res = _demux.write(item);
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expect(_demux._writableState.length).to.be.at.most(highWaterMark);
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if (!res) {
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await new Promise((resolv, rej) => {
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_demux.once("drain", () => {
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expect(_demux._writableState.length).to.be.equal(0);
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t.pass();
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resolv();
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});
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});
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}
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}
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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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return new Promise(async (resolve, reject) => {
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t.plan(7);
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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 input: Chunk[] = [
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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];
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let pendingReads = input.length;
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const highWaterMark = 5;
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const slowProcessorSpeed = 25;
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const construct = (destKey: string) => {
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const first = map(
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async (chunk: Chunk) => {
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await sleep(slowProcessorSpeed);
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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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);
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first.on("data", () => {
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t.pass();
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pendingReads--;
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if (pendingReads === 0) {
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resolve();
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}
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});
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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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reject();
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});
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const start = performance.now();
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for (const item of input) {
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const res = _demux.write(item);
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if (!res) {
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await new Promise((resolv, rej) => {
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// This event should be received after all items in demux are processed
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_demux.once("drain", () => {
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expect(performance.now() - start).to.be.greaterThan(
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slowProcessorSpeed * highWaterMark,
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);
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t.pass();
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resolv();
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});
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});
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}
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}
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});
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});
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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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interface Chunk {
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key: string;
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mapped: number[];
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}
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const highWaterMark = 5;
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const input = [
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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];
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let pendingReads = input.length;
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const construct = (destKey: string) => {
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const first = map(
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async (chunk: Chunk) => {
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await sleep(50);
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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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);
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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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});
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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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_demux.on("error", err => {
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reject();
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});
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for (const item of input) {
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const res = _demux.write(item);
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expect(_demux._writableState.length).to.be.at.most(highWaterMark);
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if (!res) {
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await new Promise(_resolve => {
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_demux.once("drain", () => {
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_resolve();
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expect(_demux._writableState.length).to.be.equal(0);
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t.pass();
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});
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});
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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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"demux() should emit drain event when third stream is bottleneck",
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t => {
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t.plan(8);
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const slowProcessorSpeed = 100;
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const highWaterMark = 5;
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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 sink = new Writable({
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objectMode: true,
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write(chunk, encoding, cb) {
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expect(chunk.mapped).to.deep.equal([1, 2]);
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t.pass();
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pendingReads--;
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if (pendingReads === 0) {
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t.end();
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}
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cb();
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},
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});
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const construct = (destKey: string) => {
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const first = map(
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(chunk: Chunk) => {
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chunk.mapped.push(1);
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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 second = map(
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async (chunk: Chunk) => {
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await sleep(slowProcessorSpeed);
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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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first.pipe(second).pipe(sink);
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return first;
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};
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const _demux = demux(construct, () => "a", {
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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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t.end(err);
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});
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// 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)
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_demux.on("drain", () => {
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expect(_demux._writableState.length).to.be.equal(0);
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expect(performance.now() - start).to.be.greaterThan(
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slowProcessorSpeed * (input.length - 2),
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);
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t.pass();
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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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{ key: "f", mapped: [] },
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{ key: "g", mapped: [] },
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];
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let pendingReads = input.length;
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const start = performance.now();
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input.forEach(item => {
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_demux.write(item);
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});
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},
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);
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test.cb(
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"demux() should emit drain event when second stream is bottleneck",
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t => {
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t.plan(8);
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const slowProcessorSpeed = 100;
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const highWaterMark = 5;
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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 sink = new Writable({
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objectMode: true,
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write(chunk, encoding, cb) {
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expect(chunk.mapped).to.deep.equal([1, 2, 3]);
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t.pass();
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pendingReads--;
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if (pendingReads === 0) {
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t.end();
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}
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cb();
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},
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});
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const construct = (destKey: string) => {
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const first = map(
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(chunk: Chunk) => {
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chunk.mapped.push(1);
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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 second = map(
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(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, highWaterMark: 1 },
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);
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const third = map(
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async (chunk: Chunk) => {
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await sleep(slowProcessorSpeed);
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chunk.mapped.push(3);
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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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first
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.pipe(second)
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.pipe(third)
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.pipe(sink);
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return first;
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};
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const _demux = demux(construct, () => "a", {
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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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t.end(err);
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});
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// 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)
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_demux.on("drain", () => {
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expect(_demux._writableState.length).to.be.equal(0);
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expect(performance.now() - start).to.be.greaterThan(
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slowProcessorSpeed * (input.length - 4),
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);
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t.pass();
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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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{ key: "f", mapped: [] },
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{ key: "g", mapped: [] },
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];
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let pendingReads = input.length;
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const start = performance.now();
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input.forEach(item => {
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_demux.write(item);
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});
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},
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);
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test("demux() should be blocked by slowest pipeline", t => {
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t.plan(1);
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const slowProcessorSpeed = 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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return new Promise(async (resolve, reject) => {
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const construct = (destKey: string) => {
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const first = map(
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async (chunk: Chunk) => {
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await sleep(slowProcessorSpeed);
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chunk.mapped.push(1);
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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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first.on("data", chunk => {
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pendingReads--;
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if (chunk.key === "b") {
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expect(performance.now() - start).to.be.greaterThan(
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slowProcessorSpeed * totalItems,
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);
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t.pass();
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expect(pendingReads).to.equal(0);
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resolve();
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}
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});
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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: 1,
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});
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_demux.on("error", err => {
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reject(err);
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});
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const input = [
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{ key: "a", mapped: [] },
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{ key: "a", mapped: [] },
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{ key: "c", mapped: [] },
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{ key: "c", mapped: [] },
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{ key: "c", mapped: [] },
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{ key: "b", mapped: [] },
|
|
];
|
|
|
|
let pendingReads = input.length;
|
|
const totalItems = input.length;
|
|
const start = performance.now();
|
|
for (const item of input) {
|
|
if (!_demux.write(item)) {
|
|
await new Promise(_resolve => {
|
|
_demux.once("drain", () => {
|
|
_resolve();
|
|
});
|
|
});
|
|
}
|
|
}
|
|
});
|
|
});
|
|
|
|
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[];
|
|
}
|
|
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 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 },
|
|
);
|
|
|
|
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 },
|
|
);
|
|
|
|
first.pipe(second).pipe(sink);
|
|
return first;
|
|
};
|
|
|
|
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);
|
|
});
|
|
});
|
|
});
|
|
|
|
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 remux = map(d => {
|
|
console.log(d);
|
|
t.deepEqual(d, result[i]);
|
|
i++;
|
|
if (i === input.length) {
|
|
t.end();
|
|
}
|
|
});
|
|
|
|
const demuxed = demux(construct, "key", {
|
|
objectMode: true,
|
|
remultiplex: remux,
|
|
});
|
|
|
|
input.forEach(event => demuxed.write(event));
|
|
});
|