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https://github.com/denoland/deno.git
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430 lines
10 KiB
JavaScript
430 lines
10 KiB
JavaScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// Copyright Joyent and Node contributors. All rights reserved. MIT license.
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// TODO(petamoriken): enable prefer-primordials for node polyfills
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// deno-lint-ignore-file prefer-primordials ban-untagged-todo
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import { ERR_INVALID_ARG_TYPE } from "ext:deno_node/internal/errors.ts";
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import { validateFunction } from "ext:deno_node/internal/validators.mjs";
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import { nextTick } from "node:process";
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import { primordials } from "ext:core/mod.js";
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const {
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ArrayPrototypeAt,
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ArrayPrototypeIndexOf,
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ArrayPrototypePush,
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ArrayPrototypeSplice,
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ObjectDefineProperty,
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ObjectGetPrototypeOf,
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ObjectSetPrototypeOf,
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Promise,
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PromisePrototypeThen,
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PromiseReject,
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PromiseResolve,
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ReflectApply,
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SafeFinalizationRegistry,
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SafeMap,
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SymbolHasInstance,
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} = primordials;
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import { WeakReference } from "ext:deno_node/internal/util.mjs";
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// Can't delete when weakref count reaches 0 as it could increment again.
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// Only GC can be used as a valid time to clean up the channels map.
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class WeakRefMap extends SafeMap {
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#finalizers = new SafeFinalizationRegistry((key) => {
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this.delete(key);
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});
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set(key, value) {
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this.#finalizers.register(value, key);
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return super.set(key, new WeakReference(value));
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}
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get(key) {
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return super.get(key)?.get();
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}
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incRef(key) {
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return super.get(key)?.incRef();
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}
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decRef(key) {
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return super.get(key)?.decRef();
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}
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}
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function markActive(channel) {
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ObjectSetPrototypeOf(channel, ActiveChannel.prototype);
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channel._subscribers = [];
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channel._stores = new SafeMap();
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}
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function maybeMarkInactive(channel) {
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// When there are no more active subscribers or bound, restore to fast prototype.
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if (!channel._subscribers.length && !channel._stores.size) {
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ObjectSetPrototypeOf(channel, Channel.prototype);
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channel._subscribers = undefined;
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channel._stores = undefined;
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}
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}
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function defaultTransform(data) {
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return data;
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}
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function wrapStoreRun(store, data, next, transform = defaultTransform) {
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return () => {
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let context;
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try {
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context = transform(data);
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} catch (err) {
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nextTick(() => {
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// TODO(bartlomieju): in Node.js this is using `triggerUncaughtException` API, need
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// to clarify if we need that or if just throwing the error is enough here.
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throw err;
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// triggerUncaughtException(err, false);
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});
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return next();
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}
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return store.run(context, next);
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};
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}
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class ActiveChannel {
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subscribe(subscription) {
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validateFunction(subscription, "subscription");
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ArrayPrototypePush(this._subscribers, subscription);
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channels.incRef(this.name);
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}
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unsubscribe(subscription) {
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const index = ArrayPrototypeIndexOf(this._subscribers, subscription);
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if (index === -1) return false;
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ArrayPrototypeSplice(this._subscribers, index, 1);
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channels.decRef(this.name);
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maybeMarkInactive(this);
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return true;
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}
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bindStore(store, transform) {
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const replacing = this._stores.has(store);
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if (!replacing) channels.incRef(this.name);
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this._stores.set(store, transform);
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}
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unbindStore(store) {
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if (!this._stores.has(store)) {
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return false;
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}
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this._stores.delete(store);
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channels.decRef(this.name);
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maybeMarkInactive(this);
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return true;
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}
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get hasSubscribers() {
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return true;
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}
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publish(data) {
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for (let i = 0; i < (this._subscribers?.length || 0); i++) {
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try {
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const onMessage = this._subscribers[i];
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onMessage(data, this.name);
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} catch (err) {
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nextTick(() => {
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// TODO(bartlomieju): in Node.js this is using `triggerUncaughtException` API, need
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// to clarify if we need that or if just throwing the error is enough here.
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throw err;
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// triggerUncaughtException(err, false);
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});
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}
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}
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}
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runStores(data, fn, thisArg, ...args) {
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let run = () => {
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this.publish(data);
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return ReflectApply(fn, thisArg, args);
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};
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for (const entry of this._stores.entries()) {
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const store = entry[0];
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const transform = entry[1];
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run = wrapStoreRun(store, data, run, transform);
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}
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return run();
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}
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}
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class Channel {
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constructor(name) {
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this._subscribers = undefined;
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this._stores = undefined;
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this.name = name;
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channels.set(name, this);
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}
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static [SymbolHasInstance](instance) {
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const prototype = ObjectGetPrototypeOf(instance);
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return prototype === Channel.prototype ||
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prototype === ActiveChannel.prototype;
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}
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subscribe(subscription) {
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markActive(this);
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this.subscribe(subscription);
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}
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unsubscribe() {
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return false;
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}
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bindStore(store, transform) {
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markActive(this);
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this.bindStore(store, transform);
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}
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unbindStore() {
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return false;
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}
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get hasSubscribers() {
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return false;
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}
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publish() {}
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runStores(_data, fn, thisArg, ...args) {
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return ReflectApply(fn, thisArg, args);
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}
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}
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const channels = new WeakRefMap();
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export function channel(name) {
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const channel = channels.get(name);
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if (channel) return channel;
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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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return new Channel(name);
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}
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export function subscribe(name, subscription) {
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return channel(name).subscribe(subscription);
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}
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export function unsubscribe(name, subscription) {
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return channel(name).unsubscribe(subscription);
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}
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export function hasSubscribers(name) {
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const channel = channels.get(name);
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if (!channel) return false;
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return channel.hasSubscribers;
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}
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const traceEvents = [
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"start",
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"end",
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"asyncStart",
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"asyncEnd",
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"error",
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];
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function assertChannel(value, name) {
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if (!(value instanceof Channel)) {
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throw new ERR_INVALID_ARG_TYPE(name, ["Channel"], value);
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}
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}
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function tracingChannelFrom(nameOrChannels, name) {
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if (typeof nameOrChannels === "string") {
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return channel(`tracing:${nameOrChannels}:${name}`);
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}
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if (typeof nameOrChannels === "object" && nameOrChannels !== null) {
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const channel = nameOrChannels[name];
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assertChannel(channel, `nameOrChannels.${name}`);
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return channel;
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}
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throw new ERR_INVALID_ARG_TYPE("nameOrChannels", [
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"string",
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"object",
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"Channel",
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], nameOrChannels);
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}
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class TracingChannel {
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constructor(nameOrChannels) {
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for (const eventName of traceEvents) {
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ObjectDefineProperty(this, eventName, {
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__proto__: null,
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value: tracingChannelFrom(nameOrChannels, eventName),
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});
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}
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}
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get hasSubscribers() {
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return this.start.hasSubscribers ||
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this.end.hasSubscribers ||
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this.asyncStart.hasSubscribers ||
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this.asyncEnd.hasSubscribers ||
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this.error.hasSubscribers;
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}
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subscribe(handlers) {
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for (const name of traceEvents) {
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if (!handlers[name]) continue;
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this[name]?.subscribe(handlers[name]);
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}
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}
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unsubscribe(handlers) {
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let done = true;
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for (const name of traceEvents) {
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if (!handlers[name]) continue;
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if (!this[name]?.unsubscribe(handlers[name])) {
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done = false;
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}
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}
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return done;
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}
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traceSync(fn, context = {}, thisArg, ...args) {
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if (!this.hasSubscribers) {
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return ReflectApply(fn, thisArg, args);
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}
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const { start, end, error } = this;
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return start.runStores(context, () => {
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try {
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const result = ReflectApply(fn, thisArg, args);
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context.result = result;
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return result;
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} catch (err) {
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context.error = err;
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error.publish(context);
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throw err;
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} finally {
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end.publish(context);
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}
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});
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}
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tracePromise(fn, context = {}, thisArg, ...args) {
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if (!this.hasSubscribers) {
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return ReflectApply(fn, thisArg, args);
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}
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const { start, end, asyncStart, asyncEnd, error } = this;
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function reject(err) {
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context.error = err;
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error.publish(context);
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asyncStart.publish(context);
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// TODO: Is there a way to have asyncEnd _after_ the continuation?
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asyncEnd.publish(context);
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return PromiseReject(err);
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}
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function resolve(result) {
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context.result = result;
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asyncStart.publish(context);
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// TODO: Is there a way to have asyncEnd _after_ the continuation?
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asyncEnd.publish(context);
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return result;
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}
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return start.runStores(context, () => {
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try {
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let promise = ReflectApply(fn, thisArg, args);
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// Convert thenables to native promises
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if (!(promise instanceof Promise)) {
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promise = PromiseResolve(promise);
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}
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return PromisePrototypeThen(promise, resolve, reject);
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} catch (err) {
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context.error = err;
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error.publish(context);
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throw err;
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} finally {
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end.publish(context);
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}
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});
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}
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traceCallback(fn, position = -1, context = {}, thisArg, ...args) {
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if (!this.hasSubscribers) {
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return ReflectApply(fn, thisArg, args);
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}
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const { start, end, asyncStart, asyncEnd, error } = this;
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function wrappedCallback(err, res) {
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if (err) {
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context.error = err;
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error.publish(context);
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} else {
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context.result = res;
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}
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// Using runStores here enables manual context failure recovery
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asyncStart.runStores(context, () => {
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try {
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return ReflectApply(callback, this, arguments);
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} finally {
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asyncEnd.publish(context);
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}
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});
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}
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const callback = ArrayPrototypeAt(args, position);
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validateFunction(callback, "callback");
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ArrayPrototypeSplice(args, position, 1, wrappedCallback);
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return start.runStores(context, () => {
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try {
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return ReflectApply(fn, thisArg, args);
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} catch (err) {
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context.error = err;
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error.publish(context);
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throw err;
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} finally {
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end.publish(context);
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}
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});
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}
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}
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export function tracingChannel(nameOrChannels) {
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return new TracingChannel(nameOrChannels);
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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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tracingChannel,
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unsubscribe,
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Channel,
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};
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