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const {
FunctionPrototypeBind,
Promise,
PromiseReject,
ReflectConstruct,
SafePromisePrototypeFinally,
Symbol,
} = primordials;
const {
Timeout,
Immediate,
insert
} = require('internal/timers');
const {
clearImmediate,
clearInterval,
clearTimeout,
} = require('timers');
const {
AbortError,
codes: {
ERR_ILLEGAL_CONSTRUCTOR,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_THIS,
}
} = require('internal/errors');
const {
validateAbortSignal,
validateBoolean,
validateObject,
} = require('internal/validators');
const {
kEmptyObject,
} = require('internal/util');
const kScheduler = Symbol('kScheduler');
function cancelListenerHandler(clear, reject, signal) {
if (!this._destroyed) {
clear(this);
reject(new AbortError(undefined, { cause: signal?.reason }));
}
}
function setTimeout(after, value, options = kEmptyObject) {
const args = value !== undefined ? [value] : value;
if (options == null || typeof options !== 'object') {
return PromiseReject(
new ERR_INVALID_ARG_TYPE(
'options',
'Object',
options));
}
const { signal, ref = true } = options;
try {
validateAbortSignal(signal, 'options.signal');
} catch (err) {
return PromiseReject(err);
}
if (typeof ref !== 'boolean') {
return PromiseReject(
new ERR_INVALID_ARG_TYPE(
'options.ref',
'boolean',
ref));
}
// TODO(@jasnell): If a decision is made that this cannot be backported
// to 12.x, then this can be converted to use optional chaining to
// simplify the check.
if (signal && signal.aborted) {
return PromiseReject(new AbortError(undefined, { cause: signal.reason }));
}
let oncancel;
const ret = new Promise((resolve, reject) => {
const timeout = new Timeout(resolve, after, args, false, ref);
insert(timeout, timeout._idleTimeout);
if (signal) {
oncancel = FunctionPrototypeBind(cancelListenerHandler,
timeout, clearTimeout, reject, signal);
signal.addEventListener('abort', oncancel);
}
});
return oncancel !== undefined ?
SafePromisePrototypeFinally(
ret,
() => signal.removeEventListener('abort', oncancel)) : ret;
}
function setImmediate(value, options = kEmptyObject) {
if (options == null || typeof options !== 'object') {
return PromiseReject(
new ERR_INVALID_ARG_TYPE(
'options',
'Object',
options));
}
const { signal, ref = true } = options;
try {
validateAbortSignal(signal, 'options.signal');
} catch (err) {
return PromiseReject(err);
}
if (typeof ref !== 'boolean') {
return PromiseReject(
new ERR_INVALID_ARG_TYPE(
'options.ref',
'boolean',
ref));
}
// TODO(@jasnell): If a decision is made that this cannot be backported
// to 12.x, then this can be converted to use optional chaining to
// simplify the check.
if (signal && signal.aborted) {
return PromiseReject(new AbortError(undefined, { cause: signal.reason }));
}
let oncancel;
const ret = new Promise((resolve, reject) => {
const immediate = new Immediate(resolve, [value]);
if (!ref) immediate.unref();
if (signal) {
oncancel = FunctionPrototypeBind(cancelListenerHandler,
immediate, clearImmediate, reject,
signal);
signal.addEventListener('abort', oncancel);
}
});
return oncancel !== undefined ?
SafePromisePrototypeFinally(
ret,
() => signal.removeEventListener('abort', oncancel)) : ret;
}
async function* setInterval(after, value, options = kEmptyObject) {
validateObject(options, 'options');
const { signal, ref = true } = options;
validateAbortSignal(signal, 'options.signal');
validateBoolean(ref, 'options.ref');
if (signal?.aborted)
throw new AbortError(undefined, { cause: signal?.reason });
let onCancel;
let interval;
try {
let notYielded = 0;
let callback;
interval = new Timeout(() => {
notYielded++;
if (callback) {
callback();
callback = undefined;
}
}, after, undefined, true, ref);
insert(interval, interval._idleTimeout);
if (signal) {
onCancel = () => {
clearInterval(interval);
if (callback) {
callback(
PromiseReject(
new AbortError(undefined, { cause: signal.reason })));
callback = undefined;
}
};
signal.addEventListener('abort', onCancel, { once: true });
}
while (!signal?.aborted) {
if (notYielded === 0) {
await new Promise((resolve) => callback = resolve);
}
for (; notYielded > 0; notYielded--) {
yield value;
}
}
throw new AbortError(undefined, { cause: signal?.reason });
} finally {
clearInterval(interval);
signal?.removeEventListener('abort', onCancel);
}
}
// TODO(@jasnell): Scheduler is an API currently being discussed by WICG
// for Web Platform standardization: https://github.com/WICG/scheduling-apis
// The scheduler.yield() and scheduler.wait() methods correspond roughly to
// the awaitable setTimeout and setImmediate implementations here. This api
// should be considered to be experimental until the spec for these are
// finalized. Note, also, that Scheduler is expected to be defined as a global,
// but while the API is experimental we shouldn't expose it as such.
class Scheduler {
constructor() {
throw new ERR_ILLEGAL_CONSTRUCTOR();
}
/**
* @returns {Promise<void>}
*/
yield() {
if (!this[kScheduler])
throw new ERR_INVALID_THIS('Scheduler');
return setImmediate();
}
/**
* @typedef {import('../internal/abort_controller').AbortSignal} AbortSignal
* @param {number} delay
* @param {{ signal?: AbortSignal }} [options]
* @returns {Promise<void>}
*/
wait(delay, options) {
if (!this[kScheduler])
throw new ERR_INVALID_THIS('Scheduler');
return setTimeout(delay, undefined, { signal: options?.signal });
}
}
module.exports = {
setTimeout,
setImmediate,
setInterval,
scheduler: ReflectConstruct(function() {
this[kScheduler] = true;
}, [], Scheduler),
};
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