Frederik Spirgi
25 lines
1.1 KiB
JavaScript
25 lines
1.1 KiB
JavaScript
const crypto = require('node:crypto');
|
|
class AppError extends Error {
|
|
constructor(code, message, status = 400) { super(message); this.code = code; this.status = status; }
|
|
}
|
|
class KeyedQueue {
|
|
constructor() { this.tails = new Map(); }
|
|
run(keys, task) {
|
|
keys = [...new Set(keys)].sort();
|
|
const previous = keys.map(key => this.tails.get(key) || Promise.resolve());
|
|
const result = Promise.all(previous).then(task);
|
|
const tail = result.catch(() => {});
|
|
for (const key of keys) this.tails.set(key, tail);
|
|
tail.then(() => { for (const key of keys) if (this.tails.get(key) === tail) this.tails.delete(key); });
|
|
return result;
|
|
}
|
|
async drain() { await Promise.all([...this.tails.values()]); }
|
|
}
|
|
const hash = value => crypto.createHash('sha256').update(value).digest('hex');
|
|
function canonical(value) {
|
|
if (Array.isArray(value)) return value.map(canonical);
|
|
if (value && typeof value === 'object') return Object.fromEntries(Object.keys(value).sort().map(key => [key, canonical(value[key])]));
|
|
return value;
|
|
}
|
|
module.exports = {AppError, KeyedQueue, hash, canonical};
|