overleaf/services/clsi/app/coffee/LockManager.coffee

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2017-09-22 11:19:33 -04:00
Settings = require('settings-sharelatex')
logger = require "logger-sharelatex"
Lockfile = require('lockfile') # from https://github.com/npm/lockfile
Errors = require "./Errors"
module.exports = LockManager =
LOCK_TEST_INTERVAL: 1000 # 50ms between each test of the lock
MAX_LOCK_WAIT_TIME: 15000 # 10s maximum time to spend trying to get the lock
LOCK_STALE: 5*60*1000 # 5 mins time until lock auto expires
runWithLock: (path, runner = ((releaseLock = (error) ->) ->), callback = ((error) ->)) ->
lockOpts =
wait: @MAX_LOCK_WAIT_TIME
pollPeriod: @LOCK_TEST_INTERVAL
stale: @LOCK_STALE
Lockfile.lock path, lockOpts, (error) ->
return callback new Errors.AlreadyCompilingError("compile in progress") if error?.code is 'EEXIST'
return callback(error) if error?
runner (error1, args...) ->
Lockfile.unlock path, (error2) ->
error = error1 or error2
return callback(error) if error?
callback(null, args...)