392 lines
11 KiB
JavaScript
392 lines
11 KiB
JavaScript
/* Copyright 2017 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import {
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AbortException,
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createPromiseCapability,
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UnknownErrorException,
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} from "../../src/shared/util.js";
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import { LoopbackPort } from "../../src/display/api.js";
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import { MessageHandler } from "../../src/shared/message_handler.js";
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describe("message_handler", function () {
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// Sleep function to wait for sometime, similar to setTimeout but faster.
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function sleep(ticks) {
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return Promise.resolve().then(() => {
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return ticks && sleep(ticks - 1);
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});
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}
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describe("sendWithStream", function () {
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it("should return a ReadableStream", function () {
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const port = new LoopbackPort();
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const messageHandler1 = new MessageHandler("main", "worker", port);
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const readable = messageHandler1.sendWithStream("fakeHandler");
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// Check if readable is an instance of ReadableStream.
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expect(typeof readable).toEqual("object");
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expect(typeof readable.getReader).toEqual("function");
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});
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it("should read using a reader", async function () {
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let log = "";
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const port = new LoopbackPort();
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const messageHandler1 = new MessageHandler("main", "worker", port);
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const messageHandler2 = new MessageHandler("worker", "main", port);
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messageHandler2.on("fakeHandler", (data, sink) => {
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sink.onPull = function () {
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log += "p";
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};
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sink.onCancel = function (reason) {
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log += "c";
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};
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sink.ready
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.then(() => {
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sink.enqueue("hi");
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return sink.ready;
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})
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.then(() => {
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sink.close();
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});
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return sleep(5);
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});
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const readable = messageHandler1.sendWithStream(
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"fakeHandler",
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{},
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{
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highWaterMark: 1,
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size() {
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return 1;
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},
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}
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);
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const reader = readable.getReader();
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await sleep(10);
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expect(log).toEqual("");
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let result = await reader.read();
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expect(log).toEqual("p");
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expect(result.value).toEqual("hi");
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expect(result.done).toEqual(false);
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await sleep(10);
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result = await reader.read();
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expect(result.value).toEqual(undefined);
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expect(result.done).toEqual(true);
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});
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it("should not read any data when cancelled", async function () {
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let log = "";
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const port = new LoopbackPort();
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const messageHandler2 = new MessageHandler("worker", "main", port);
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messageHandler2.on("fakeHandler", (data, sink) => {
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sink.onPull = function () {
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log += "p";
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};
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sink.onCancel = function (reason) {
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log += "c";
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};
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log += "0";
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sink.ready
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.then(() => {
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log += "1";
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sink.enqueue([1, 2, 3, 4], 4);
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return sink.ready;
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})
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.then(() => {
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log += "2";
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sink.enqueue([5, 6, 7, 8], 4);
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return sink.ready;
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})
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.then(
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() => {
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log += "3";
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sink.close();
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},
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() => {
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log += "4";
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}
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);
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});
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const messageHandler1 = new MessageHandler("main", "worker", port);
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const readable = messageHandler1.sendWithStream(
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"fakeHandler",
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{},
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{
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highWaterMark: 4,
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size(arr) {
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return arr.length;
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},
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}
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);
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const reader = readable.getReader();
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await sleep(10);
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expect(log).toEqual("01");
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const result = await reader.read();
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expect(result.value).toEqual([1, 2, 3, 4]);
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expect(result.done).toEqual(false);
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await sleep(10);
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expect(log).toEqual("01p2");
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await reader.cancel(new AbortException("reader cancelled."));
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expect(log).toEqual("01p2c4");
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});
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it("should not read when errored", async function () {
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let log = "";
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const port = new LoopbackPort();
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const messageHandler2 = new MessageHandler("worker", "main", port);
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messageHandler2.on("fakeHandler", (data, sink) => {
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sink.onPull = function () {
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log += "p";
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};
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sink.onCancel = function (reason) {
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log += "c";
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};
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log += "0";
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sink.ready
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.then(() => {
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log += "1";
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sink.enqueue([1, 2, 3, 4], 4);
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return sink.ready;
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})
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.then(() => {
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log += "e";
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sink.error(new Error("should not read when errored"));
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});
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});
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const messageHandler1 = new MessageHandler("main", "worker", port);
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const readable = messageHandler1.sendWithStream(
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"fakeHandler",
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{},
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{
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highWaterMark: 4,
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size(arr) {
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return arr.length;
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},
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}
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);
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const reader = readable.getReader();
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await sleep(10);
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expect(log).toEqual("01");
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const result = await reader.read();
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expect(result.value).toEqual([1, 2, 3, 4]);
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expect(result.done).toEqual(false);
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try {
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await reader.read();
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// Shouldn't get here.
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expect(false).toEqual(true);
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} catch (reason) {
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expect(log).toEqual("01pe");
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expect(reason instanceof UnknownErrorException).toEqual(true);
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expect(reason.message).toEqual("should not read when errored");
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}
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});
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it("should read data with blocking promise", async function () {
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let log = "";
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const port = new LoopbackPort();
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const messageHandler2 = new MessageHandler("worker", "main", port);
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messageHandler2.on("fakeHandler", (data, sink) => {
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sink.onPull = function () {
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log += "p";
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};
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sink.onCancel = function (reason) {
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log += "c";
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};
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log += "0";
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sink.ready
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.then(() => {
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log += "1";
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sink.enqueue([1, 2, 3, 4], 4);
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return sink.ready;
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})
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.then(() => {
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log += "2";
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sink.enqueue([5, 6, 7, 8], 4);
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return sink.ready;
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})
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.then(() => {
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sink.close();
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});
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});
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const messageHandler1 = new MessageHandler("main", "worker", port);
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const readable = messageHandler1.sendWithStream(
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"fakeHandler",
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{},
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{
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highWaterMark: 4,
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size(arr) {
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return arr.length;
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},
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}
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);
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const reader = readable.getReader();
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// Sleep for 10ms, so that read() is not unblocking the ready promise.
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// Chain all read() to stream in sequence.
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await sleep(10);
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expect(log).toEqual("01");
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let result = await reader.read();
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expect(result.value).toEqual([1, 2, 3, 4]);
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expect(result.done).toEqual(false);
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await sleep(10);
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expect(log).toEqual("01p2");
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result = await reader.read();
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expect(result.value).toEqual([5, 6, 7, 8]);
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expect(result.done).toEqual(false);
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await sleep(10);
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expect(log).toEqual("01p2p");
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result = await reader.read();
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expect(result.value).toEqual(undefined);
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expect(result.done).toEqual(true);
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});
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it(
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"should read data with blocking promise and buffer whole data" +
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" into stream",
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async function () {
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let log = "";
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const port = new LoopbackPort();
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const messageHandler2 = new MessageHandler("worker", "main", port);
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messageHandler2.on("fakeHandler", (data, sink) => {
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sink.onPull = function () {
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log += "p";
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};
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sink.onCancel = function (reason) {
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log += "c";
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};
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log += "0";
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sink.ready
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.then(() => {
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log += "1";
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sink.enqueue([1, 2, 3, 4], 4);
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return sink.ready;
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})
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.then(() => {
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log += "2";
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sink.enqueue([5, 6, 7, 8], 4);
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return sink.ready;
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})
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.then(() => {
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sink.close();
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});
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return sleep(10);
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});
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const messageHandler1 = new MessageHandler("main", "worker", port);
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const readable = messageHandler1.sendWithStream(
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"fakeHandler",
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{},
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{
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highWaterMark: 8,
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size(arr) {
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return arr.length;
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},
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}
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);
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const reader = readable.getReader();
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await sleep(10);
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expect(log).toEqual("012");
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let result = await reader.read();
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expect(result.value).toEqual([1, 2, 3, 4]);
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expect(result.done).toEqual(false);
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await sleep(10);
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expect(log).toEqual("012p");
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result = await reader.read();
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expect(result.value).toEqual([5, 6, 7, 8]);
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expect(result.done).toEqual(false);
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await sleep(10);
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expect(log).toEqual("012p");
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result = await reader.read();
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expect(result.value).toEqual(undefined);
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expect(result.done).toEqual(true);
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}
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);
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it("should ignore any pull after close is called", async function () {
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let log = "";
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const port = new LoopbackPort();
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const capability = createPromiseCapability();
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const messageHandler2 = new MessageHandler("worker", "main", port);
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messageHandler2.on("fakeHandler", (data, sink) => {
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sink.onPull = function () {
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log += "p";
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};
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sink.onCancel = function (reason) {
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log += "c";
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};
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log += "0";
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sink.ready.then(() => {
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log += "1";
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sink.enqueue([1, 2, 3, 4], 4);
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});
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return capability.promise.then(() => {
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sink.close();
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});
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});
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const messageHandler1 = new MessageHandler("main", "worker", port);
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const readable = messageHandler1.sendWithStream(
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"fakeHandler",
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{},
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{
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highWaterMark: 10,
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size(arr) {
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return arr.length;
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},
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}
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);
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const reader = readable.getReader();
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await sleep(10);
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expect(log).toEqual("01");
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capability.resolve();
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await capability.promise;
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let result = await reader.read();
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expect(result.value).toEqual([1, 2, 3, 4]);
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expect(result.done).toEqual(false);
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await sleep(10);
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expect(log).toEqual("01");
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result = await reader.read();
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expect(result.value).toEqual(undefined);
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expect(result.done).toEqual(true);
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});
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});
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});
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