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