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d47147fb6a
This commit moves "deno_std/node" in "ext/node" crate. The code is transpiled and snapshotted during the build process. During the first pass a minimal amount of work was done to create the snapshot, a lot of code in "ext/node" depends on presence of "Deno" global. This code will be gradually fixed in the follow up PRs to migrate it to import relevant APIs from "internal:" modules. Currently the code from snapshot is not used in any way, and all Node/npm compatibility still uses code from "https://deno.land/std/node" (or from the location specified by "DENO_NODE_COMPAT_URL"). This will also be handled in a follow up PRs. --------- Co-authored-by: crowlkats <crowlkats@toaxl.com> Co-authored-by: Divy Srivastava <dj.srivastava23@gmail.com> Co-authored-by: Yoshiya Hinosawa <stibium121@gmail.com>
89 lines
2 KiB
TypeScript
89 lines
2 KiB
TypeScript
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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import { ERR_INVALID_ARG_TYPE } from "internal:deno_node/polyfills/internal/errors.ts";
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import { validateFunction } from "internal:deno_node/polyfills/internal/validators.mjs";
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import { nextTick } from "internal:deno_node/polyfills/process.ts";
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type Subscriber = (message: unknown, name?: string) => void;
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export class Channel {
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_subscribers: Subscriber[];
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name: string;
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constructor(name: string) {
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this._subscribers = [];
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this.name = name;
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}
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publish(message: unknown) {
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for (const subscriber of this._subscribers) {
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try {
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subscriber(message, this.name);
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} catch (err) {
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nextTick(() => {
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throw err;
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});
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}
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}
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}
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subscribe(subscription: Subscriber) {
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validateFunction(subscription, "subscription");
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this._subscribers.push(subscription);
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}
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unsubscribe(subscription: Subscriber) {
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if (!this._subscribers.includes(subscription)) {
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return false;
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}
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this._subscribers.splice(this._subscribers.indexOf(subscription), 1);
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return true;
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}
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get hasSubscribers() {
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return this._subscribers.length > 0;
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}
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}
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const channels: Record<string, Channel> = {};
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export function channel(name: string) {
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if (typeof name !== "string" && typeof name !== "symbol") {
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throw new ERR_INVALID_ARG_TYPE("channel", ["string", "symbol"], name);
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}
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if (!Object.hasOwn(channels, name)) {
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channels[name] = new Channel(name);
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}
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return channels[name];
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}
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export function hasSubscribers(name: string) {
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if (!Object.hasOwn(channels, name)) {
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return false;
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}
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return channels[name].hasSubscribers;
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}
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export function subscribe(name: string, subscription: Subscriber) {
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const c = channel(name);
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return c.subscribe(subscription);
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}
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export function unsubscribe(name: string, subscription: Subscriber) {
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const c = channel(name);
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return c.unsubscribe(subscription);
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}
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export default {
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channel,
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hasSubscribers,
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subscribe,
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unsubscribe,
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Channel,
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};
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