overleaf/services/clsi/app/js/LockManager.js

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const { promisify } = require('util')
const OError = require('@overleaf/o-error')
const Lockfile = require('lockfile')
const Errors = require('./Errors')
const fsPromises = require('fs/promises')
const Path = require('path')
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const LOCK_OPTS = {
pollPeriod: 1000, // 1s between each test of the lock
wait: 15000, // 15s maximum time to spend trying to get the lock
stale: 5 * 60 * 1000, // 5 mins time until lock auto expires
}
const PromisifiedLockfile = {
lock: promisify(Lockfile.lock),
unlock: promisify(Lockfile.unlock),
}
async function acquire(path) {
try {
await PromisifiedLockfile.lock(path, LOCK_OPTS)
} catch (err) {
if (err.code === 'EEXIST') {
throw new Errors.AlreadyCompilingError('compile in progress')
} else {
const dir = Path.dirname(path)
const [statLock, statDir, readdirDir] = await Promise.allSettled([
fsPromises.lstat(path),
fsPromises.lstat(dir),
fsPromises.readdir(dir),
])
OError.tag(err, 'unable to get lock', {
statLock: unwrapPromiseResult(statLock),
statDir: unwrapPromiseResult(statDir),
readdirDir: unwrapPromiseResult(readdirDir),
})
throw err
}
}
return new Lock(path)
}
class Lock {
constructor(path) {
this._path = path
}
async release() {
await PromisifiedLockfile.unlock(this._path)
}
}
function unwrapPromiseResult(result) {
if (result.status === 'fulfilled') {
return result.value
} else {
return result.reason
}
}
module.exports = { acquire }