mirror of
https://github.com/denoland/deno.git
synced 2024-12-15 03:48:02 -05:00
430 lines
10 KiB
JavaScript
430 lines
10 KiB
JavaScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
|
|
// Copyright Joyent and Node contributors. All rights reserved. MIT license.
|
|
|
|
// TODO(petamoriken): enable prefer-primordials for node polyfills
|
|
// deno-lint-ignore-file prefer-primordials ban-untagged-todo
|
|
|
|
import { ERR_INVALID_ARG_TYPE } from "ext:deno_node/internal/errors.ts";
|
|
import { validateFunction } from "ext:deno_node/internal/validators.mjs";
|
|
import { nextTick } from "node:process";
|
|
import { primordials } from "ext:core/mod.js";
|
|
|
|
const {
|
|
ArrayPrototypeAt,
|
|
ArrayPrototypeIndexOf,
|
|
ArrayPrototypePush,
|
|
ArrayPrototypeSplice,
|
|
ObjectDefineProperty,
|
|
ObjectGetPrototypeOf,
|
|
ObjectSetPrototypeOf,
|
|
Promise,
|
|
PromisePrototypeThen,
|
|
PromiseReject,
|
|
PromiseResolve,
|
|
ReflectApply,
|
|
SafeFinalizationRegistry,
|
|
SafeMap,
|
|
SymbolHasInstance,
|
|
} = primordials;
|
|
import { WeakReference } from "ext:deno_node/internal/util.mjs";
|
|
|
|
// Can't delete when weakref count reaches 0 as it could increment again.
|
|
// Only GC can be used as a valid time to clean up the channels map.
|
|
class WeakRefMap extends SafeMap {
|
|
#finalizers = new SafeFinalizationRegistry((key) => {
|
|
this.delete(key);
|
|
});
|
|
|
|
set(key, value) {
|
|
this.#finalizers.register(value, key);
|
|
return super.set(key, new WeakReference(value));
|
|
}
|
|
|
|
get(key) {
|
|
return super.get(key)?.get();
|
|
}
|
|
|
|
incRef(key) {
|
|
return super.get(key)?.incRef();
|
|
}
|
|
|
|
decRef(key) {
|
|
return super.get(key)?.decRef();
|
|
}
|
|
}
|
|
|
|
function markActive(channel) {
|
|
ObjectSetPrototypeOf(channel, ActiveChannel.prototype);
|
|
channel._subscribers = [];
|
|
channel._stores = new SafeMap();
|
|
}
|
|
|
|
function maybeMarkInactive(channel) {
|
|
// When there are no more active subscribers or bound, restore to fast prototype.
|
|
if (!channel._subscribers.length && !channel._stores.size) {
|
|
ObjectSetPrototypeOf(channel, Channel.prototype);
|
|
channel._subscribers = undefined;
|
|
channel._stores = undefined;
|
|
}
|
|
}
|
|
|
|
function defaultTransform(data) {
|
|
return data;
|
|
}
|
|
|
|
function wrapStoreRun(store, data, next, transform = defaultTransform) {
|
|
return () => {
|
|
let context;
|
|
try {
|
|
context = transform(data);
|
|
} catch (err) {
|
|
nextTick(() => {
|
|
// TODO(bartlomieju): in Node.js this is using `triggerUncaughtException` API, need
|
|
// to clarify if we need that or if just throwing the error is enough here.
|
|
throw err;
|
|
// triggerUncaughtException(err, false);
|
|
});
|
|
return next();
|
|
}
|
|
|
|
return store.run(context, next);
|
|
};
|
|
}
|
|
|
|
class ActiveChannel {
|
|
subscribe(subscription) {
|
|
validateFunction(subscription, "subscription");
|
|
ArrayPrototypePush(this._subscribers, subscription);
|
|
channels.incRef(this.name);
|
|
}
|
|
|
|
unsubscribe(subscription) {
|
|
const index = ArrayPrototypeIndexOf(this._subscribers, subscription);
|
|
if (index === -1) return false;
|
|
|
|
ArrayPrototypeSplice(this._subscribers, index, 1);
|
|
|
|
channels.decRef(this.name);
|
|
maybeMarkInactive(this);
|
|
|
|
return true;
|
|
}
|
|
|
|
bindStore(store, transform) {
|
|
const replacing = this._stores.has(store);
|
|
if (!replacing) channels.incRef(this.name);
|
|
this._stores.set(store, transform);
|
|
}
|
|
|
|
unbindStore(store) {
|
|
if (!this._stores.has(store)) {
|
|
return false;
|
|
}
|
|
|
|
this._stores.delete(store);
|
|
|
|
channels.decRef(this.name);
|
|
maybeMarkInactive(this);
|
|
|
|
return true;
|
|
}
|
|
|
|
get hasSubscribers() {
|
|
return true;
|
|
}
|
|
|
|
publish(data) {
|
|
for (let i = 0; i < (this._subscribers?.length || 0); i++) {
|
|
try {
|
|
const onMessage = this._subscribers[i];
|
|
onMessage(data, this.name);
|
|
} catch (err) {
|
|
nextTick(() => {
|
|
// TODO(bartlomieju): in Node.js this is using `triggerUncaughtException` API, need
|
|
// to clarify if we need that or if just throwing the error is enough here.
|
|
throw err;
|
|
// triggerUncaughtException(err, false);
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
runStores(data, fn, thisArg, ...args) {
|
|
let run = () => {
|
|
this.publish(data);
|
|
return ReflectApply(fn, thisArg, args);
|
|
};
|
|
|
|
for (const entry of this._stores.entries()) {
|
|
const store = entry[0];
|
|
const transform = entry[1];
|
|
run = wrapStoreRun(store, data, run, transform);
|
|
}
|
|
|
|
return run();
|
|
}
|
|
}
|
|
|
|
class Channel {
|
|
constructor(name) {
|
|
this._subscribers = undefined;
|
|
this._stores = undefined;
|
|
this.name = name;
|
|
|
|
channels.set(name, this);
|
|
}
|
|
|
|
static [SymbolHasInstance](instance) {
|
|
const prototype = ObjectGetPrototypeOf(instance);
|
|
return prototype === Channel.prototype ||
|
|
prototype === ActiveChannel.prototype;
|
|
}
|
|
|
|
subscribe(subscription) {
|
|
markActive(this);
|
|
this.subscribe(subscription);
|
|
}
|
|
|
|
unsubscribe() {
|
|
return false;
|
|
}
|
|
|
|
bindStore(store, transform) {
|
|
markActive(this);
|
|
this.bindStore(store, transform);
|
|
}
|
|
|
|
unbindStore() {
|
|
return false;
|
|
}
|
|
|
|
get hasSubscribers() {
|
|
return false;
|
|
}
|
|
|
|
publish() {}
|
|
|
|
runStores(_data, fn, thisArg, ...args) {
|
|
return ReflectApply(fn, thisArg, args);
|
|
}
|
|
}
|
|
|
|
const channels = new WeakRefMap();
|
|
|
|
export function channel(name) {
|
|
const channel = channels.get(name);
|
|
if (channel) return channel;
|
|
|
|
if (typeof name !== "string" && typeof name !== "symbol") {
|
|
throw new ERR_INVALID_ARG_TYPE("channel", ["string", "symbol"], name);
|
|
}
|
|
|
|
return new Channel(name);
|
|
}
|
|
|
|
export function subscribe(name, subscription) {
|
|
return channel(name).subscribe(subscription);
|
|
}
|
|
|
|
export function unsubscribe(name, subscription) {
|
|
return channel(name).unsubscribe(subscription);
|
|
}
|
|
|
|
export function hasSubscribers(name) {
|
|
const channel = channels.get(name);
|
|
if (!channel) return false;
|
|
|
|
return channel.hasSubscribers;
|
|
}
|
|
|
|
const traceEvents = [
|
|
"start",
|
|
"end",
|
|
"asyncStart",
|
|
"asyncEnd",
|
|
"error",
|
|
];
|
|
|
|
function assertChannel(value, name) {
|
|
if (!(value instanceof Channel)) {
|
|
throw new ERR_INVALID_ARG_TYPE(name, ["Channel"], value);
|
|
}
|
|
}
|
|
|
|
function tracingChannelFrom(nameOrChannels, name) {
|
|
if (typeof nameOrChannels === "string") {
|
|
return channel(`tracing:${nameOrChannels}:${name}`);
|
|
}
|
|
|
|
if (typeof nameOrChannels === "object" && nameOrChannels !== null) {
|
|
const channel = nameOrChannels[name];
|
|
assertChannel(channel, `nameOrChannels.${name}`);
|
|
return channel;
|
|
}
|
|
|
|
throw new ERR_INVALID_ARG_TYPE("nameOrChannels", [
|
|
"string",
|
|
"object",
|
|
"Channel",
|
|
], nameOrChannels);
|
|
}
|
|
|
|
class TracingChannel {
|
|
constructor(nameOrChannels) {
|
|
for (const eventName of traceEvents) {
|
|
ObjectDefineProperty(this, eventName, {
|
|
__proto__: null,
|
|
value: tracingChannelFrom(nameOrChannels, eventName),
|
|
});
|
|
}
|
|
}
|
|
|
|
get hasSubscribers() {
|
|
return this.start.hasSubscribers ||
|
|
this.end.hasSubscribers ||
|
|
this.asyncStart.hasSubscribers ||
|
|
this.asyncEnd.hasSubscribers ||
|
|
this.error.hasSubscribers;
|
|
}
|
|
|
|
subscribe(handlers) {
|
|
for (const name of traceEvents) {
|
|
if (!handlers[name]) continue;
|
|
|
|
this[name]?.subscribe(handlers[name]);
|
|
}
|
|
}
|
|
|
|
unsubscribe(handlers) {
|
|
let done = true;
|
|
|
|
for (const name of traceEvents) {
|
|
if (!handlers[name]) continue;
|
|
|
|
if (!this[name]?.unsubscribe(handlers[name])) {
|
|
done = false;
|
|
}
|
|
}
|
|
|
|
return done;
|
|
}
|
|
|
|
traceSync(fn, context = {}, thisArg, ...args) {
|
|
if (!this.hasSubscribers) {
|
|
return ReflectApply(fn, thisArg, args);
|
|
}
|
|
|
|
const { start, end, error } = this;
|
|
|
|
return start.runStores(context, () => {
|
|
try {
|
|
const result = ReflectApply(fn, thisArg, args);
|
|
context.result = result;
|
|
return result;
|
|
} catch (err) {
|
|
context.error = err;
|
|
error.publish(context);
|
|
throw err;
|
|
} finally {
|
|
end.publish(context);
|
|
}
|
|
});
|
|
}
|
|
|
|
tracePromise(fn, context = {}, thisArg, ...args) {
|
|
if (!this.hasSubscribers) {
|
|
return ReflectApply(fn, thisArg, args);
|
|
}
|
|
|
|
const { start, end, asyncStart, asyncEnd, error } = this;
|
|
|
|
function reject(err) {
|
|
context.error = err;
|
|
error.publish(context);
|
|
asyncStart.publish(context);
|
|
// TODO: Is there a way to have asyncEnd _after_ the continuation?
|
|
asyncEnd.publish(context);
|
|
return PromiseReject(err);
|
|
}
|
|
|
|
function resolve(result) {
|
|
context.result = result;
|
|
asyncStart.publish(context);
|
|
// TODO: Is there a way to have asyncEnd _after_ the continuation?
|
|
asyncEnd.publish(context);
|
|
return result;
|
|
}
|
|
|
|
return start.runStores(context, () => {
|
|
try {
|
|
let promise = ReflectApply(fn, thisArg, args);
|
|
// Convert thenables to native promises
|
|
if (!(promise instanceof Promise)) {
|
|
promise = PromiseResolve(promise);
|
|
}
|
|
return PromisePrototypeThen(promise, resolve, reject);
|
|
} catch (err) {
|
|
context.error = err;
|
|
error.publish(context);
|
|
throw err;
|
|
} finally {
|
|
end.publish(context);
|
|
}
|
|
});
|
|
}
|
|
|
|
traceCallback(fn, position = -1, context = {}, thisArg, ...args) {
|
|
if (!this.hasSubscribers) {
|
|
return ReflectApply(fn, thisArg, args);
|
|
}
|
|
|
|
const { start, end, asyncStart, asyncEnd, error } = this;
|
|
|
|
function wrappedCallback(err, res) {
|
|
if (err) {
|
|
context.error = err;
|
|
error.publish(context);
|
|
} else {
|
|
context.result = res;
|
|
}
|
|
|
|
// Using runStores here enables manual context failure recovery
|
|
asyncStart.runStores(context, () => {
|
|
try {
|
|
return ReflectApply(callback, this, arguments);
|
|
} finally {
|
|
asyncEnd.publish(context);
|
|
}
|
|
});
|
|
}
|
|
|
|
const callback = ArrayPrototypeAt(args, position);
|
|
validateFunction(callback, "callback");
|
|
ArrayPrototypeSplice(args, position, 1, wrappedCallback);
|
|
|
|
return start.runStores(context, () => {
|
|
try {
|
|
return ReflectApply(fn, thisArg, args);
|
|
} catch (err) {
|
|
context.error = err;
|
|
error.publish(context);
|
|
throw err;
|
|
} finally {
|
|
end.publish(context);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
|
|
export function tracingChannel(nameOrChannels) {
|
|
return new TracingChannel(nameOrChannels);
|
|
}
|
|
|
|
export default {
|
|
channel,
|
|
hasSubscribers,
|
|
subscribe,
|
|
tracingChannel,
|
|
unsubscribe,
|
|
Channel,
|
|
};
|