mirror of
https://github.com/denoland/deno.git
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1154 lines
30 KiB
JavaScript
1154 lines
30 KiB
JavaScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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// TODO(petamoriken): enable prefer-primordials for node polyfills
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// deno-lint-ignore-file prefer-primordials
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"use strict";
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const kRejection = Symbol.for("nodejs.rejection");
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import { inspect } from "ext:deno_node/internal/util/inspect.mjs";
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import {
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AbortError,
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// kEnhanceStackBeforeInspector,
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ERR_INVALID_ARG_TYPE,
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ERR_INVALID_THIS,
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ERR_OUT_OF_RANGE,
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ERR_UNHANDLED_ERROR,
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} from "ext:deno_node/internal/errors.ts";
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import { AsyncResource } from "node:async_hooks";
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import {
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validateAbortSignal,
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validateBoolean,
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validateFunction,
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validateString,
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} from "ext:deno_node/internal/validators.mjs";
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import { spliceOne } from "ext:deno_node/_utils.ts";
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import { nextTick } from "ext:deno_node/_process/process.ts";
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import { nodeGlobals } from "ext:deno_node/00_globals.js";
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const kCapture = Symbol("kCapture");
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const kErrorMonitor = Symbol("events.errorMonitor");
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const kMaxEventTargetListeners = Symbol("events.maxEventTargetListeners");
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const kMaxEventTargetListenersWarned = Symbol(
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"events.maxEventTargetListenersWarned",
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);
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/**
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* Creates a new `EventEmitter` instance.
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* @param {{ captureRejections?: boolean; }} [opts]
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* @returns {EventEmitter}
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*/
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export function EventEmitter(opts) {
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EventEmitter.init.call(this, opts);
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}
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export default EventEmitter;
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EventEmitter.on = on;
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EventEmitter.once = once;
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EventEmitter.getEventListeners = getEventListeners;
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EventEmitter.setMaxListeners = setMaxListeners;
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EventEmitter.listenerCount = listenerCount;
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// Backwards-compat with node 0.10.x
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EventEmitter.EventEmitter = EventEmitter;
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EventEmitter.usingDomains = false;
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EventEmitter.captureRejectionSymbol = kRejection;
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export const captureRejectionSymbol = EventEmitter.captureRejectionSymbol;
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export const errorMonitor = EventEmitter.errorMonitor;
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Object.defineProperty(EventEmitter, "captureRejections", {
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get() {
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return EventEmitter.prototype[kCapture];
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},
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set(value) {
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validateBoolean(value, "EventEmitter.captureRejections");
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EventEmitter.prototype[kCapture] = value;
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},
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enumerable: true,
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});
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EventEmitter.errorMonitor = kErrorMonitor;
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// The default for captureRejections is false
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Object.defineProperty(EventEmitter.prototype, kCapture, {
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value: false,
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writable: true,
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enumerable: false,
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});
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EventEmitter.prototype._events = undefined;
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EventEmitter.prototype._eventsCount = 0;
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EventEmitter.prototype._maxListeners = undefined;
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// By default EventEmitters will print a warning if more than 10 listeners are
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// added to it. This is a useful default which helps finding memory leaks.
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export let defaultMaxListeners = 10;
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function checkListener(listener) {
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validateFunction(listener, "listener");
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}
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Object.defineProperty(EventEmitter, "defaultMaxListeners", {
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enumerable: true,
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get: function () {
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return defaultMaxListeners;
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},
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set: function (arg) {
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if (typeof arg !== "number" || arg < 0 || Number.isNaN(arg)) {
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throw new ERR_OUT_OF_RANGE(
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"defaultMaxListeners",
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"a non-negative number",
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arg,
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);
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}
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defaultMaxListeners = arg;
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},
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});
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Object.defineProperties(EventEmitter, {
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kMaxEventTargetListeners: {
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value: kMaxEventTargetListeners,
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enumerable: false,
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configurable: false,
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writable: false,
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},
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kMaxEventTargetListenersWarned: {
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value: kMaxEventTargetListenersWarned,
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enumerable: false,
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configurable: false,
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writable: false,
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},
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});
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/**
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* Sets the max listeners.
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* @param {number} n
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* @param {EventTarget[] | EventEmitter[]} [eventTargets]
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* @returns {void}
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*/
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export function setMaxListeners(
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n = defaultMaxListeners,
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...eventTargets
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) {
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if (typeof n !== "number" || n < 0 || Number.isNaN(n)) {
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throw new ERR_OUT_OF_RANGE("n", "a non-negative number", n);
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}
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if (eventTargets.length === 0) {
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defaultMaxListeners = n;
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} else {
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for (let i = 0; i < eventTargets.length; i++) {
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const target = eventTargets[i];
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if (target instanceof EventTarget) {
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target[kMaxEventTargetListeners] = n;
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target[kMaxEventTargetListenersWarned] = false;
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} else if (typeof target.setMaxListeners === "function") {
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target.setMaxListeners(n);
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} else {
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throw new ERR_INVALID_ARG_TYPE(
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"eventTargets",
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["EventEmitter", "EventTarget"],
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target,
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);
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}
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}
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}
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}
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EventEmitter.init = function (opts) {
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if (
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this._events === undefined ||
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this._events === Object.getPrototypeOf(this)._events
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) {
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this._events = Object.create(null);
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this._eventsCount = 0;
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}
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this._maxListeners = this._maxListeners || undefined;
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if (opts?.captureRejections) {
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validateBoolean(opts.captureRejections, "options.captureRejections");
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this[kCapture] = Boolean(opts.captureRejections);
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} else {
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// Assigning the kCapture property directly saves an expensive
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// prototype lookup in a very sensitive hot path.
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this[kCapture] = EventEmitter.prototype[kCapture];
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}
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};
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function addCatch(that, promise, type, args) {
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if (!that[kCapture]) {
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return;
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}
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// Handle Promises/A+ spec, then could be a getter
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// that throws on second use.
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try {
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const then = promise.then;
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if (typeof then === "function") {
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then.call(promise, undefined, function (err) {
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// The callback is called with nextTick to avoid a follow-up
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// rejection from this promise.
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nextTick(emitUnhandledRejectionOrErr, that, err, type, args);
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});
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}
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} catch (err) {
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that.emit("error", err);
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}
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}
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function emitUnhandledRejectionOrErr(ee, err, type, args) {
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if (typeof ee[kRejection] === "function") {
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ee[kRejection](err, type, ...args);
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} else {
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// We have to disable the capture rejections mechanism, otherwise
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// we might end up in an infinite loop.
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const prev = ee[kCapture];
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// If the error handler throws, it is not catcheable and it
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// will end up in 'uncaughtException'. We restore the previous
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// value of kCapture in case the uncaughtException is present
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// and the exception is handled.
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try {
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ee[kCapture] = false;
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ee.emit("error", err);
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} finally {
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ee[kCapture] = prev;
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}
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}
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}
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/**
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* Increases the max listeners of the event emitter.
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* @param {number} n
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* @returns {EventEmitter}
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*/
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EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
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if (typeof n !== "number" || n < 0 || Number.isNaN(n)) {
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throw new ERR_OUT_OF_RANGE("n", "a non-negative number", n);
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}
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this._maxListeners = n;
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return this;
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};
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function _getMaxListeners(that) {
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if (that._maxListeners === undefined) {
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return EventEmitter.defaultMaxListeners;
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}
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return that._maxListeners;
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}
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/**
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* Returns the current max listener value for the event emitter.
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* @returns {number}
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*/
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EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
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return _getMaxListeners(this);
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};
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// Returns the length and line number of the first sequence of `a` that fully
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// appears in `b` with a length of at least 4.
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function identicalSequenceRange(a, b) {
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for (let i = 0; i < a.length - 3; i++) {
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// Find the first entry of b that matches the current entry of a.
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const pos = b.indexOf(a[i]);
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if (pos !== -1) {
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const rest = b.length - pos;
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if (rest > 3) {
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let len = 1;
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const maxLen = Math.min(a.length - i, rest);
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// Count the number of consecutive entries.
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while (maxLen > len && a[i + len] === b[pos + len]) {
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len++;
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}
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if (len > 3) {
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return [len, i];
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}
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}
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}
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}
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return [0, 0];
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}
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// deno-lint-ignore no-unused-vars
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function enhanceStackTrace(err, own) {
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let ctorInfo = "";
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try {
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const { name } = this.constructor;
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if (name !== "EventEmitter") {
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ctorInfo = ` on ${name} instance`;
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}
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} catch {
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// pass
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}
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const sep = `\nEmitted 'error' event${ctorInfo} at:\n`;
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const errStack = err.stack.split("\n").slice(1);
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const ownStack = own.stack.split("\n").slice(1);
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const { 0: len, 1: off } = identicalSequenceRange(ownStack, errStack);
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if (len > 0) {
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ownStack.splice(
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off + 1,
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len - 2,
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" [... lines matching original stack trace ...]",
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);
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}
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return err.stack + sep + ownStack.join("\n");
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}
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/**
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* Synchronously calls each of the listeners registered
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* for the event.
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* @param {string | symbol} type
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* @param {...any} [args]
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* @returns {boolean}
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*/
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EventEmitter.prototype.emit = function emit(type, ...args) {
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let doError = type === "error";
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const events = this._events;
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if (events !== undefined) {
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if (doError && events[kErrorMonitor] !== undefined) {
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this.emit(kErrorMonitor, ...args);
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}
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doError = doError && events.error === undefined;
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} else if (!doError) {
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return false;
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}
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// If there is no 'error' event listener then throw.
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if (doError) {
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let er;
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if (args.length > 0) {
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er = args[0];
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}
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if (er instanceof Error) {
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try {
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const capture = {};
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Error.captureStackTrace(capture, EventEmitter.prototype.emit);
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// Object.defineProperty(er, kEnhanceStackBeforeInspector, {
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// value: enhanceStackTrace.bind(this, er, capture),
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// configurable: true
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// });
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} catch {
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// pass
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}
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// Note: The comments on the `throw` lines are intentional, they show
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// up in Node's output if this results in an unhandled exception.
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throw er; // Unhandled 'error' event
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}
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let stringifiedEr;
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try {
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stringifiedEr = inspect(er);
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} catch {
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stringifiedEr = er;
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}
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// At least give some kind of context to the user
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const err = new ERR_UNHANDLED_ERROR(stringifiedEr);
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err.context = er;
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throw err; // Unhandled 'error' event
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}
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const handler = events[type];
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if (handler === undefined) {
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return false;
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}
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if (typeof handler === "function") {
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const result = handler.apply(this, args);
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// We check if result is undefined first because that
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// is the most common case so we do not pay any perf
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// penalty
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if (result !== undefined && result !== null) {
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addCatch(this, result, type, args);
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}
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} else {
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const len = handler.length;
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const listeners = arrayClone(handler);
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for (let i = 0; i < len; ++i) {
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const result = listeners[i].apply(this, args);
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// We check if result is undefined first because that
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// is the most common case so we do not pay any perf
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// penalty.
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// This code is duplicated because extracting it away
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// would make it non-inlineable.
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if (result !== undefined && result !== null) {
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addCatch(this, result, type, args);
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}
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}
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}
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return true;
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};
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function _addListener(target, type, listener, prepend) {
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let m;
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let events;
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let existing;
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checkListener(listener);
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events = target._events;
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if (events === undefined) {
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events = target._events = Object.create(null);
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target._eventsCount = 0;
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} else {
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// To avoid recursion in the case that type === "newListener"! Before
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// adding it to the listeners, first emit "newListener".
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if (events.newListener !== undefined) {
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target.emit("newListener", type, listener.listener ?? listener);
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// Re-assign `events` because a newListener handler could have caused the
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// this._events to be assigned to a new object
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events = target._events;
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}
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existing = events[type];
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}
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if (existing === undefined) {
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// Optimize the case of one listener. Don't need the extra array object.
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events[type] = listener;
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++target._eventsCount;
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} else {
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if (typeof existing === "function") {
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// Adding the second element, need to change to array.
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existing = events[type] = prepend
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? [listener, existing]
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: [existing, listener];
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// If we've already got an array, just append.
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} else if (prepend) {
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existing.unshift(listener);
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} else {
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existing.push(listener);
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}
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// Check for listener leak
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m = _getMaxListeners(target);
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if (m > 0 && existing.length > m && !existing.warned) {
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existing.warned = true;
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// No error code for this since it is a Warning
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// eslint-disable-next-line no-restricted-syntax
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const w = new Error(
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"Possible EventEmitter memory leak detected. " +
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`${existing.length} ${String(type)} listeners ` +
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`added to ${inspect(target, { depth: -1 })}. Use ` +
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"emitter.setMaxListeners() to increase limit",
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);
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w.name = "MaxListenersExceededWarning";
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w.emitter = target;
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w.type = type;
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w.count = existing.length;
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nodeGlobals.process.emitWarning(w);
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}
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}
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return target;
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}
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|
|
/**
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* Adds a listener to the event emitter.
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|
* @param {string | symbol} type
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|
* @param {Function} listener
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|
* @returns {EventEmitter}
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*/
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|
EventEmitter.prototype.addListener = function addListener(type, listener) {
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return _addListener(this, type, listener, false);
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};
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EventEmitter.prototype.on = EventEmitter.prototype.addListener;
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|
|
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/**
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|
* Adds the `listener` function to the beginning of
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* the listeners array.
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|
* @param {string | symbol} type
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|
* @param {Function} listener
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|
* @returns {EventEmitter}
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|
*/
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|
EventEmitter.prototype.prependListener = function prependListener(
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type,
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listener,
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) {
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return _addListener(this, type, listener, true);
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|
};
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|
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|
function onceWrapper() {
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|
if (!this.fired) {
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|
this.target.removeListener(this.type, this.wrapFn);
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|
this.fired = true;
|
|
if (arguments.length === 0) {
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return this.listener.call(this.target);
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}
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return this.listener.apply(this.target, arguments);
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}
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}
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|
function _onceWrap(target, type, listener) {
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const state = { fired: false, wrapFn: undefined, target, type, listener };
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const wrapped = onceWrapper.bind(state);
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wrapped.listener = listener;
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state.wrapFn = wrapped;
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return wrapped;
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}
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|
|
|
/**
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|
* Adds a one-time `listener` function to the event emitter.
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|
* @param {string | symbol} type
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|
* @param {Function} listener
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|
* @returns {EventEmitter}
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|
*/
|
|
EventEmitter.prototype.once = function once(type, listener) {
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checkListener(listener);
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this.on(type, _onceWrap(this, type, listener));
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return this;
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};
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|
|
|
/**
|
|
* Adds a one-time `listener` function to the beginning of
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* the listeners array.
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|
* @param {string | symbol} type
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|
* @param {Function} listener
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|
* @returns {EventEmitter}
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|
*/
|
|
EventEmitter.prototype.prependOnceListener = function prependOnceListener(
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type,
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listener,
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) {
|
|
checkListener(listener);
|
|
|
|
this.prependListener(type, _onceWrap(this, type, listener));
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Removes the specified `listener` from the listeners array.
|
|
* @param {string | symbol} type
|
|
* @param {Function} listener
|
|
* @returns {EventEmitter}
|
|
*/
|
|
EventEmitter.prototype.removeListener = function removeListener(
|
|
type,
|
|
listener,
|
|
) {
|
|
checkListener(listener);
|
|
|
|
const events = this._events;
|
|
if (events === undefined) {
|
|
return this;
|
|
}
|
|
|
|
const list = events[type];
|
|
if (list === undefined) {
|
|
return this;
|
|
}
|
|
|
|
if (list === listener || list.listener === listener) {
|
|
if (--this._eventsCount === 0) {
|
|
this._events = Object.create(null);
|
|
} else {
|
|
delete events[type];
|
|
if (events.removeListener) {
|
|
this.emit("removeListener", type, list.listener || listener);
|
|
}
|
|
}
|
|
} else if (typeof list !== "function") {
|
|
let position = -1;
|
|
|
|
for (let i = list.length - 1; i >= 0; i--) {
|
|
if (list[i] === listener || list[i].listener === listener) {
|
|
position = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (position < 0) {
|
|
return this;
|
|
}
|
|
|
|
if (position === 0) {
|
|
list.shift();
|
|
} else {
|
|
spliceOne(list, position);
|
|
}
|
|
|
|
if (list.length === 1) {
|
|
events[type] = list[0];
|
|
}
|
|
|
|
if (events.removeListener !== undefined) {
|
|
this.emit("removeListener", type, listener);
|
|
}
|
|
}
|
|
|
|
return this;
|
|
};
|
|
|
|
EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
|
|
|
|
/**
|
|
* Removes all listeners from the event emitter. (Only
|
|
* removes listeners for a specific event name if specified
|
|
* as `type`).
|
|
* @param {string | symbol} [type]
|
|
* @returns {EventEmitter}
|
|
*/
|
|
EventEmitter.prototype.removeAllListeners = function removeAllListeners(type) {
|
|
const events = this._events;
|
|
if (events === undefined) {
|
|
return this;
|
|
}
|
|
|
|
// Not listening for removeListener, no need to emit
|
|
if (events.removeListener === undefined) {
|
|
if (arguments.length === 0) {
|
|
this._events = Object.create(null);
|
|
this._eventsCount = 0;
|
|
} else if (events[type] !== undefined) {
|
|
if (--this._eventsCount === 0) {
|
|
this._events = Object.create(null);
|
|
} else {
|
|
delete events[type];
|
|
}
|
|
}
|
|
return this;
|
|
}
|
|
|
|
// Emit removeListener for all listeners on all events
|
|
if (arguments.length === 0) {
|
|
for (const key of Reflect.ownKeys(events)) {
|
|
if (key === "removeListener") continue;
|
|
this.removeAllListeners(key);
|
|
}
|
|
this.removeAllListeners("removeListener");
|
|
this._events = Object.create(null);
|
|
this._eventsCount = 0;
|
|
return this;
|
|
}
|
|
|
|
const listeners = events[type];
|
|
|
|
if (typeof listeners === "function") {
|
|
this.removeListener(type, listeners);
|
|
} else if (listeners !== undefined) {
|
|
// LIFO order
|
|
for (let i = listeners.length - 1; i >= 0; i--) {
|
|
this.removeListener(type, listeners[i]);
|
|
}
|
|
}
|
|
|
|
return this;
|
|
};
|
|
|
|
function _listeners(target, type, unwrap) {
|
|
const events = target._events;
|
|
|
|
if (events === undefined) {
|
|
return [];
|
|
}
|
|
|
|
const evlistener = events[type];
|
|
if (evlistener === undefined) {
|
|
return [];
|
|
}
|
|
|
|
if (typeof evlistener === "function") {
|
|
return unwrap ? [evlistener.listener || evlistener] : [evlistener];
|
|
}
|
|
|
|
return unwrap ? unwrapListeners(evlistener) : arrayClone(evlistener);
|
|
}
|
|
|
|
/**
|
|
* Returns a copy of the array of listeners for the event name
|
|
* specified as `type`.
|
|
* @param {string | symbol} type
|
|
* @returns {Function[]}
|
|
*/
|
|
EventEmitter.prototype.listeners = function listeners(type) {
|
|
return _listeners(this, type, true);
|
|
};
|
|
|
|
/**
|
|
* Returns a copy of the array of listeners and wrappers for
|
|
* the event name specified as `type`.
|
|
* @param {string | symbol} type
|
|
* @returns {Function[]}
|
|
*/
|
|
EventEmitter.prototype.rawListeners = function rawListeners(type) {
|
|
return _listeners(this, type, false);
|
|
};
|
|
|
|
/**
|
|
* Returns the number of listeners listening to event name
|
|
* specified as `type`.
|
|
* @param {string | symbol} type
|
|
* @returns {number}
|
|
*/
|
|
const _listenerCount = function listenerCount(type) {
|
|
const events = this._events;
|
|
|
|
if (events !== undefined) {
|
|
const evlistener = events[type];
|
|
|
|
if (typeof evlistener === "function") {
|
|
return 1;
|
|
} else if (evlistener !== undefined) {
|
|
return evlistener.length;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
};
|
|
|
|
EventEmitter.prototype.listenerCount = _listenerCount;
|
|
|
|
/**
|
|
* Returns the number of listeners listening to the event name
|
|
* specified as `type`.
|
|
* @deprecated since v3.2.0
|
|
* @param {EventEmitter} emitter
|
|
* @param {string | symbol} type
|
|
* @returns {number}
|
|
*/
|
|
export function listenerCount(emitter, type) {
|
|
if (typeof emitter.listenerCount === "function") {
|
|
return emitter.listenerCount(type);
|
|
}
|
|
return _listenerCount.call(emitter, type);
|
|
}
|
|
|
|
/**
|
|
* Returns an array listing the events for which
|
|
* the emitter has registered listeners.
|
|
* @returns {any[]}
|
|
*/
|
|
EventEmitter.prototype.eventNames = function eventNames() {
|
|
return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
|
|
};
|
|
|
|
function arrayClone(arr) {
|
|
// At least since V8 8.3, this implementation is faster than the previous
|
|
// which always used a simple for-loop
|
|
switch (arr.length) {
|
|
case 2:
|
|
return [arr[0], arr[1]];
|
|
case 3:
|
|
return [arr[0], arr[1], arr[2]];
|
|
case 4:
|
|
return [arr[0], arr[1], arr[2], arr[3]];
|
|
case 5:
|
|
return [arr[0], arr[1], arr[2], arr[3], arr[4]];
|
|
case 6:
|
|
return [arr[0], arr[1], arr[2], arr[3], arr[4], arr[5]];
|
|
}
|
|
return arr.slice();
|
|
}
|
|
|
|
function unwrapListeners(arr) {
|
|
const ret = arrayClone(arr);
|
|
for (let i = 0; i < ret.length; ++i) {
|
|
const orig = ret[i].listener;
|
|
if (typeof orig === "function") {
|
|
ret[i] = orig;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Returns a copy of the array of listeners for the event name
|
|
* specified as `type`.
|
|
* @param {EventEmitter | EventTarget} emitterOrTarget
|
|
* @param {string | symbol} type
|
|
* @returns {Function[]}
|
|
*/
|
|
export function getEventListeners(emitterOrTarget, type) {
|
|
// First check if EventEmitter
|
|
if (typeof emitterOrTarget.listeners === "function") {
|
|
return emitterOrTarget.listeners(type);
|
|
}
|
|
if (emitterOrTarget instanceof EventTarget) {
|
|
// TODO: kEvents is not defined
|
|
const root = emitterOrTarget[kEvents].get(type);
|
|
const listeners = [];
|
|
let handler = root?.next;
|
|
while (handler?.listener !== undefined) {
|
|
const listener = handler.listener?.deref
|
|
? handler.listener.deref()
|
|
: handler.listener;
|
|
listeners.push(listener);
|
|
handler = handler.next;
|
|
}
|
|
return listeners;
|
|
}
|
|
throw new ERR_INVALID_ARG_TYPE(
|
|
"emitter",
|
|
["EventEmitter", "EventTarget"],
|
|
emitterOrTarget,
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Creates a `Promise` that is fulfilled when the emitter
|
|
* emits the given event.
|
|
* @param {EventEmitter} emitter
|
|
* @param {string} name
|
|
* @param {{ signal: AbortSignal; }} [options]
|
|
* @returns {Promise}
|
|
*/
|
|
// deno-lint-ignore require-await
|
|
export async function once(emitter, name, options = {}) {
|
|
const signal = options?.signal;
|
|
validateAbortSignal(signal, "options.signal");
|
|
if (signal?.aborted) {
|
|
throw new AbortError();
|
|
}
|
|
return new Promise((resolve, reject) => {
|
|
const errorListener = (err) => {
|
|
emitter.removeListener(name, resolver);
|
|
if (signal != null) {
|
|
eventTargetAgnosticRemoveListener(signal, "abort", abortListener);
|
|
}
|
|
reject(err);
|
|
};
|
|
const resolver = (...args) => {
|
|
if (typeof emitter.removeListener === "function") {
|
|
emitter.removeListener("error", errorListener);
|
|
}
|
|
if (signal != null) {
|
|
eventTargetAgnosticRemoveListener(signal, "abort", abortListener);
|
|
}
|
|
resolve(args);
|
|
};
|
|
eventTargetAgnosticAddListener(emitter, name, resolver, { once: true });
|
|
if (name !== "error" && typeof emitter.once === "function") {
|
|
emitter.once("error", errorListener);
|
|
}
|
|
function abortListener() {
|
|
eventTargetAgnosticRemoveListener(emitter, name, resolver);
|
|
eventTargetAgnosticRemoveListener(emitter, "error", errorListener);
|
|
reject(new AbortError());
|
|
}
|
|
if (signal != null) {
|
|
eventTargetAgnosticAddListener(
|
|
signal,
|
|
"abort",
|
|
abortListener,
|
|
{ once: true },
|
|
);
|
|
}
|
|
});
|
|
}
|
|
|
|
const AsyncIteratorPrototype = Object.getPrototypeOf(
|
|
Object.getPrototypeOf(async function* () {}).prototype,
|
|
);
|
|
|
|
function createIterResult(value, done) {
|
|
return { value, done };
|
|
}
|
|
|
|
function eventTargetAgnosticRemoveListener(emitter, name, listener, flags) {
|
|
if (typeof emitter.removeListener === "function") {
|
|
emitter.removeListener(name, listener);
|
|
} else if (typeof emitter.removeEventListener === "function") {
|
|
emitter.removeEventListener(name, listener, flags);
|
|
} else {
|
|
throw new ERR_INVALID_ARG_TYPE("emitter", "EventEmitter", emitter);
|
|
}
|
|
}
|
|
|
|
function eventTargetAgnosticAddListener(emitter, name, listener, flags) {
|
|
if (typeof emitter.on === "function") {
|
|
if (flags?.once) {
|
|
emitter.once(name, listener);
|
|
} else {
|
|
emitter.on(name, listener);
|
|
}
|
|
} else if (typeof emitter.addEventListener === "function") {
|
|
// EventTarget does not have `error` event semantics like Node
|
|
// EventEmitters, we do not listen to `error` events here.
|
|
emitter.addEventListener(name, (arg) => {
|
|
listener(arg);
|
|
}, flags);
|
|
} else {
|
|
throw new ERR_INVALID_ARG_TYPE("emitter", "EventEmitter", emitter);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns an `AsyncIterator` that iterates `event` events.
|
|
* @param {EventEmitter} emitter
|
|
* @param {string | symbol} event
|
|
* @param {{ signal: AbortSignal; }} [options]
|
|
* @returns {AsyncIterator}
|
|
*/
|
|
export function on(emitter, event, options) {
|
|
const signal = options?.signal;
|
|
validateAbortSignal(signal, "options.signal");
|
|
if (signal?.aborted) {
|
|
throw new AbortError();
|
|
}
|
|
|
|
const unconsumedEvents = [];
|
|
const unconsumedPromises = [];
|
|
let error = null;
|
|
let finished = false;
|
|
|
|
const iterator = Object.setPrototypeOf({
|
|
next() {
|
|
// First, we consume all unread events
|
|
const value = unconsumedEvents.shift();
|
|
if (value) {
|
|
return Promise.resolve(createIterResult(value, false));
|
|
}
|
|
|
|
// Then we error, if an error happened
|
|
// This happens one time if at all, because after 'error'
|
|
// we stop listening
|
|
if (error) {
|
|
const p = Promise.reject(error);
|
|
// Only the first element errors
|
|
error = null;
|
|
return p;
|
|
}
|
|
|
|
// If the iterator is finished, resolve to done
|
|
if (finished) {
|
|
return Promise.resolve(createIterResult(undefined, true));
|
|
}
|
|
|
|
// Wait until an event happens
|
|
return new Promise(function (resolve, reject) {
|
|
unconsumedPromises.push({ resolve, reject });
|
|
});
|
|
},
|
|
|
|
return() {
|
|
eventTargetAgnosticRemoveListener(emitter, event, eventHandler);
|
|
eventTargetAgnosticRemoveListener(emitter, "error", errorHandler);
|
|
|
|
if (signal) {
|
|
eventTargetAgnosticRemoveListener(
|
|
signal,
|
|
"abort",
|
|
abortListener,
|
|
{ once: true },
|
|
);
|
|
}
|
|
|
|
finished = true;
|
|
|
|
for (const promise of unconsumedPromises) {
|
|
promise.resolve(createIterResult(undefined, true));
|
|
}
|
|
|
|
return Promise.resolve(createIterResult(undefined, true));
|
|
},
|
|
|
|
throw(err) {
|
|
if (!err || !(err instanceof Error)) {
|
|
throw new ERR_INVALID_ARG_TYPE(
|
|
"EventEmitter.AsyncIterator",
|
|
"Error",
|
|
err,
|
|
);
|
|
}
|
|
error = err;
|
|
eventTargetAgnosticRemoveListener(emitter, event, eventHandler);
|
|
eventTargetAgnosticRemoveListener(emitter, "error", errorHandler);
|
|
},
|
|
|
|
[Symbol.asyncIterator]() {
|
|
return this;
|
|
},
|
|
}, AsyncIteratorPrototype);
|
|
|
|
eventTargetAgnosticAddListener(emitter, event, eventHandler);
|
|
if (event !== "error" && typeof emitter.on === "function") {
|
|
emitter.on("error", errorHandler);
|
|
}
|
|
|
|
if (signal) {
|
|
eventTargetAgnosticAddListener(
|
|
signal,
|
|
"abort",
|
|
abortListener,
|
|
{ once: true },
|
|
);
|
|
}
|
|
|
|
return iterator;
|
|
|
|
function abortListener() {
|
|
errorHandler(new AbortError());
|
|
}
|
|
|
|
function eventHandler(...args) {
|
|
const promise = unconsumedPromises.shift();
|
|
if (promise) {
|
|
promise.resolve(createIterResult(args, false));
|
|
} else {
|
|
unconsumedEvents.push(args);
|
|
}
|
|
}
|
|
|
|
function errorHandler(err) {
|
|
finished = true;
|
|
|
|
const toError = unconsumedPromises.shift();
|
|
|
|
if (toError) {
|
|
toError.reject(err);
|
|
} else {
|
|
// The next time we call next()
|
|
error = err;
|
|
}
|
|
|
|
iterator.return();
|
|
}
|
|
}
|
|
|
|
const kAsyncResource = Symbol("kAsyncResource");
|
|
const kEventEmitter = Symbol("kEventEmitter");
|
|
|
|
class EventEmitterReferencingAsyncResource extends AsyncResource {
|
|
/**
|
|
* @param {EventEmitter} ee
|
|
* @param {string} [type]
|
|
* @param {{
|
|
* triggerAsyncId?: number,
|
|
* requireManualDestroy?: boolean,
|
|
* }} [options]
|
|
*/
|
|
constructor(ee, type, options) {
|
|
super(type, options);
|
|
this[kEventEmitter] = ee;
|
|
}
|
|
|
|
/**
|
|
* @type {EventEmitter}
|
|
*/
|
|
get eventEmitter() {
|
|
if (this[kEventEmitter] === undefined) {
|
|
throw new ERR_INVALID_THIS("EventEmitterReferencingAsyncResource");
|
|
}
|
|
return this[kEventEmitter];
|
|
}
|
|
}
|
|
|
|
export class EventEmitterAsyncResource extends EventEmitter {
|
|
/**
|
|
* @param {{
|
|
* name?: string,
|
|
* triggerAsyncId?: number,
|
|
* requireManualDestroy?: boolean,
|
|
* }} [options]
|
|
*/
|
|
constructor(options = undefined) {
|
|
let name;
|
|
if (typeof options === "string") {
|
|
name = options;
|
|
options = undefined;
|
|
} else {
|
|
if (new.target === EventEmitterAsyncResource) {
|
|
validateString(options?.name, "options.name");
|
|
}
|
|
name = options?.name || new.target.name;
|
|
}
|
|
super(options);
|
|
|
|
this[kAsyncResource] = new EventEmitterReferencingAsyncResource(
|
|
this,
|
|
name,
|
|
options,
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @param {symbol,string} event
|
|
* @param {...any} args
|
|
* @returns {boolean}
|
|
*/
|
|
emit(event, ...args) {
|
|
if (this[kAsyncResource] === undefined) {
|
|
throw new ERR_INVALID_THIS("EventEmitterAsyncResource");
|
|
}
|
|
const { asyncResource } = this;
|
|
args.unshift(super.emit, this, event);
|
|
return asyncResource.runInAsyncScope.apply(asyncResource, args);
|
|
}
|
|
|
|
/**
|
|
* @returns {void}
|
|
*/
|
|
emitDestroy() {
|
|
if (this[kAsyncResource] === undefined) {
|
|
throw new ERR_INVALID_THIS("EventEmitterAsyncResource");
|
|
}
|
|
this.asyncResource.emitDestroy();
|
|
}
|
|
|
|
/**
|
|
* @type {number}
|
|
*/
|
|
get asyncId() {
|
|
if (this[kAsyncResource] === undefined) {
|
|
throw new ERR_INVALID_THIS("EventEmitterAsyncResource");
|
|
}
|
|
return this.asyncResource.asyncId();
|
|
}
|
|
|
|
/**
|
|
* @type {number}
|
|
*/
|
|
get triggerAsyncId() {
|
|
if (this[kAsyncResource] === undefined) {
|
|
throw new ERR_INVALID_THIS("EventEmitterAsyncResource");
|
|
}
|
|
return this.asyncResource.triggerAsyncId();
|
|
}
|
|
|
|
/**
|
|
* @type {EventEmitterReferencingAsyncResource}
|
|
*/
|
|
get asyncResource() {
|
|
if (this[kAsyncResource] === undefined) {
|
|
throw new ERR_INVALID_THIS("EventEmitterAsyncResource");
|
|
}
|
|
return this[kAsyncResource];
|
|
}
|
|
}
|
|
|
|
EventEmitter.EventEmitterAsyncResource = EventEmitterAsyncResource;
|