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// SPDX-License-Identifier: Zlib
// SPDX-FileCopyrightText: 2024 CERN (home.cern)
// SPDX-Created: 2024-02-19T10:01:22
// SPDX-FileContributor: Author: Sylvain Fargier <sylvain.fargier@cern.ch>
/**
* @template T
* @brief Deferred object class, regrouping resolve/reject and promise
*/
export class Deferred {
/** @type {Promise<T>} */
promise;
isPending = false;
/** @type {(() => any)|null} */
abort = null;
/** @type {(value: T) => void} */
resolve = (_val) => undefined;
/** @type {(err: Error|any) => void} */
reject = (_err) => undefined;
constructor() {
this.promise = new Promise((resolve, reject) => {
this.isPending = true;
this.resolve = (val) => {
this.isPending = false;
resolve(val);
};
this.reject = (err) => {
this.isPending = false;
reject(err);
};
});
}
}
/**
* @template T=any
* @return {Deferred<T>}
*/
export function makeDeferred() {
return new Deferred();
}
/**
* @brief adds a timeout on deferred
* @template T=any
* @param {Deferred<T>} deferred
* @param {number} ms
* @param {(Error|any)=} error
* @return {Promise<T>}
*/
export function deferredTimeout(deferred, ms, error) {
/** @type {NodeJS.Timeout|null} */
var timeoutId = setTimeout(function() {
if (!error || typeof error === "string") {
error = new Error(error || "Timed out after " + ms + " ms");
error.code = "ETIMEDOUT";
}
timeoutId = null;
const rej = deferred.reject;
deferred.resolve = function() {};
deferred.reject = function() {};
rej(error);
if (deferred.abort) {
deferred.abort();
}
}, ms);
return deferred.promise.finally(() => {
if (timeoutId) { clearTimeout(timeoutId); }
});
}
/**
* @brief adds a timeout on promise
* @template T=any
* @param {Promise<T>} prom
* @param {number} ms
* @param {(Error|any)=} error
* @return {Promise<T>}
*/
export function promiseTimeout(prom, ms, error) {
return new Promise(function(resolve, reject) {
let resolved = false;
const timeoutId = setTimeout(function() {
if (!error || typeof error === "string") {
error = new Error(error || "Timed out after " + ms + " ms");
error.code = "ETIMEDOUT";
}
resolved = true;
reject(error);
}, ms);
prom.then(function(value) {
if (!resolved) {
clearTimeout(timeoutId);
resolve(value);
}
}, function(error) {
if (!resolved) {
clearTimeout(timeoutId);
reject(error);
}
});
});
}
/**
* @brief adds a timeout on promise
* @template T=any
* @param {Deferred<T>|Promise<T>} promise
* @param {number} ms
* @param {(Error|any)=} error
* @return {Promise<T>}
*/
export function timeout(promise, ms, error) {
if (promise && "resolve" in promise) {
return deferredTimeout(/** @type {Deferred<T>} */ (promise),
ms, error);
}
else {
return promiseTimeout(/** @type {Promise<T>} */ (promise), ms, error);
}
}
/**
* @template T=undefined
* @param {number} ms
* @param {T} [ret]
* @return {Promise<T>}
*/
export function delay(ms, ret) {
return new Promise(function(resolve) {
setTimeout(function() { resolve(/** @type {T} */ (ret)); }, ms);
});
}
/**
* @template T=any
* @param {(ret: T) => any} fun
* @return {(ret: T) => Promise<T>}
*/
export function tap(fun) {
return function(/** @type {T} */ ret) {
return Promise.resolve(fun(ret))
.then(() => ret);
};
}
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