szdytom
73a667eeb4
- Classes: AsycLock, Task, Queue - Functions: asyncSleep, asyncTimeout, promiseTimeout, yieldTask - Errors: QueueEmptyError, TaskInteruptedError
64 lines
1.6 KiB
JavaScript
64 lines
1.6 KiB
JavaScript
import fs from 'node:fs/promises';
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// Reads JSON data from file, returns null if file not found or has other errors.
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export async function readJsonFile(path) {
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try {
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const data = await fs.readFile(path, 'utf8');
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return JSON.parse(data);
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} catch (error) {
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return null;
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}
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}
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// Write JSON data into a file.
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export function writeJsonFile(path, data) {
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const json_string = JSON.stringify(data);
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return fs.writeFile(path, json_string, 'utf8');
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}
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// Parse format "profile@host:port", port can be undefined.
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export function parseLogin(url) {
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const [profile_host, port] = url.split(':');
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const [profile, host] = profile_host.split('@');
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return [profile, host, port ? parseInt(port) : undefined];
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}
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// Returns a promise, wait unitl the EventEmitter emits certian event next time.
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export function waitEvent(em, event) {
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return new Promise((resolve, _reject) => {
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em.once(event, resolve);
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});
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}
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export function asyncSleep(t) {
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return new Promise((resolve, _reject) => {
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setTimeout(resolve, t);
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});
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}
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export function asyncTimeout(t) {
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return new Promise((_resolve, reject) => {
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setTimeout(reject, t);
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});
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}
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export function promiseTimeout(p, t) {
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return Promise.race([p, asyncTimeout(t)]);
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}
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export function yieldTask() {
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return new Promise((resolve, _reject) => {
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queueMicrotask(resolve);
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});
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}
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// Checks wheather an object is iterable.
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export function isIterable(obj) {
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if (obj == null) { return false; }
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return typeof obj[Symbol.iterator] == 'function';
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}
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export { Queue, QueueEmptyError } from './queue.mjs';
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export { AsyncLock } from './async-lock.mjs';
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export { Task, TaskInteruptedError } from './task.mjs';
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