const logger = require('logger-sharelatex') const settings = require('@overleaf/settings') const fs = require('fs') // Monitor a status file (e.g. /etc/real_time_status) periodically and close the // service if the file contents don't contain the matching deployment colour. const FILE_CHECK_INTERVAL = 5000 const statusFile = settings.deploymentFile const deploymentColour = settings.deploymentColour let serviceCloseTime function updateDeploymentStatus(fileContent) { const closed = fileContent && !fileContent.includes(deploymentColour) if (closed && !settings.serviceIsClosed) { settings.serviceIsClosed = true serviceCloseTime = Date.now() + 60 * 1000 // delay closing by 1 minute logger.warn({ fileContent }, 'closing service') } else if (!closed && settings.serviceIsClosed) { settings.serviceIsClosed = false logger.warn({ fileContent }, 'opening service') } } function pollStatusFile() { fs.readFile(statusFile, { encoding: 'utf8' }, (err, fileContent) => { if (err) { logger.error( { file: statusFile, fsErr: err }, 'error reading service status file' ) return } updateDeploymentStatus(fileContent) }) } function checkStatusFileSync() { // crash on start up if file does not exist const content = fs.readFileSync(statusFile, { encoding: 'utf8' }) updateDeploymentStatus(content) } module.exports = { initialise() { if (statusFile && deploymentColour) { logger.log( { statusFile, deploymentColour, interval: FILE_CHECK_INTERVAL }, 'monitoring deployment status file' ) checkStatusFileSync() // perform an initial synchronous check at start up setInterval(pollStatusFile, FILE_CHECK_INTERVAL) // continue checking periodically } }, deploymentIsClosed() { return settings.serviceIsClosed && Date.now() > serviceCloseTime }, }