overleaf/services/document-updater/app.js

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// Metrics must be initialized before importing anything else
require('@overleaf/metrics/initialize')
const Metrics = require('@overleaf/metrics')
const express = require('express')
const Settings = require('@overleaf/settings')
const logger = require('@overleaf/logger')
logger.initialize('document-updater')
logger.logger.addSerializers(require('./app/js/LoggerSerializers'))
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if (Settings.sentry != null && Settings.sentry.dsn != null) {
logger.initializeErrorReporting(Settings.sentry.dsn)
}
const RedisManager = require('./app/js/RedisManager')
const DispatchManager = require('./app/js/DispatchManager')
const DeleteQueueManager = require('./app/js/DeleteQueueManager')
const Errors = require('./app/js/Errors')
const HttpController = require('./app/js/HttpController')
const mongodb = require('./app/js/mongodb')
const async = require('async')
const bodyParser = require('body-parser')
Metrics.event_loop.monitor(logger, 100)
Metrics.open_sockets.monitor()
const app = express()
app.use(bodyParser.json({ limit: Settings.maxJsonRequestSize }))
Metrics.injectMetricsRoute(app)
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DispatchManager.createAndStartDispatchers(Settings.dispatcherCount)
app.get('/status', (req, res) => {
if (Settings.shuttingDown) {
return res.sendStatus(503) // Service unavailable
} else {
return res.send('document updater is alive')
}
})
const pubsubClient = require('@overleaf/redis-wrapper').createClient(
Settings.redis.pubsub
)
app.get('/health_check/redis', (req, res, next) => {
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pubsubClient.healthCheck(error => {
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if (error) {
logger.err({ err: error }, 'failed redis health check')
return res.sendStatus(500)
} else {
return res.sendStatus(200)
}
})
})
const docUpdaterRedisClient = require('@overleaf/redis-wrapper').createClient(
Settings.redis.documentupdater
)
app.get('/health_check/redis_cluster', (req, res, next) => {
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docUpdaterRedisClient.healthCheck(error => {
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if (error) {
logger.err({ err: error }, 'failed redis cluster health check')
return res.sendStatus(500)
} else {
return res.sendStatus(200)
}
})
})
app.get('/health_check', (req, res, next) => {
async.series(
[
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cb => {
pubsubClient.healthCheck(error => {
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if (error) {
logger.err({ err: error }, 'failed redis health check')
}
cb(error)
})
},
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cb => {
docUpdaterRedisClient.healthCheck(error => {
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if (error) {
logger.err({ err: error }, 'failed redis cluster health check')
}
cb(error)
})
},
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cb => {
mongodb.healthCheck(error => {
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if (error) {
logger.err({ err: error }, 'failed mongo health check')
}
cb(error)
})
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},
],
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error => {
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if (error) {
return res.sendStatus(500)
} else {
return res.sendStatus(200)
}
}
)
})
// record http metrics for the routes below this point
app.use(Metrics.http.monitor(logger))
app.param('project_id', (req, res, next, projectId) => {
if (projectId != null && projectId.match(/^[0-9a-f]{24}$/)) {
return next()
} else {
return next(new Error('invalid project id'))
}
})
app.param('doc_id', (req, res, next, docId) => {
if (docId != null && docId.match(/^[0-9a-f]{24}$/)) {
return next()
} else {
return next(new Error('invalid doc id'))
}
})
// Record requests that come in after we've started shutting down - for investigation.
app.use((req, res, next) => {
if (Settings.shuttingDown) {
logger.warn(
{ req, timeSinceShutdown: Date.now() - Settings.shutDownTime },
'request received after shutting down'
)
// We don't want keep-alive connections to be kept open when the server is shutting down.
res.set('Connection', 'close')
}
next()
})
app.get('/project/:project_id/doc/:doc_id', HttpController.getDoc)
app.get('/project/:project_id/doc/:doc_id/peek', HttpController.peekDoc)
// temporarily keep the GET method for backwards compatibility
app.get('/project/:project_id/doc', HttpController.getProjectDocsAndFlushIfOld)
// will migrate to the POST method of get_and_flush_if_old instead
app.post(
'/project/:project_id/get_and_flush_if_old',
HttpController.getProjectDocsAndFlushIfOld
)
app.post('/project/:project_id/clearState', HttpController.clearProjectState)
app.post('/project/:project_id/doc/:doc_id', HttpController.setDoc)
app.post(
'/project/:project_id/doc/:doc_id/flush',
HttpController.flushDocIfLoaded
)
app.delete('/project/:project_id/doc/:doc_id', HttpController.deleteDoc)
app.delete('/project/:project_id', HttpController.deleteProject)
app.delete('/project', HttpController.deleteMultipleProjects)
app.post('/project/:project_id', HttpController.updateProject)
app.post(
'/project/:project_id/history/resync',
longerTimeout,
HttpController.resyncProjectHistory
)
app.post('/project/:project_id/flush', HttpController.flushProject)
app.post(
'/project/:project_id/doc/:doc_id/change/:change_id/accept',
HttpController.acceptChanges
)
app.post(
'/project/:project_id/doc/:doc_id/change/accept',
HttpController.acceptChanges
)
app.delete(
'/project/:project_id/doc/:doc_id/comment/:comment_id',
HttpController.deleteComment
)
app.get('/flush_all_projects', HttpController.flushAllProjects)
app.get('/flush_queued_projects', HttpController.flushQueuedProjects)
app.get('/total', (req, res, next) => {
const timer = new Metrics.Timer('http.allDocList')
RedisManager.getCountOfDocsInMemory((err, count) => {
if (err) {
return next(err)
}
timer.done()
res.send({ total: count })
})
})
app.use((error, req, res, next) => {
if (error instanceof Errors.NotFoundError) {
return res.sendStatus(404)
} else if (error instanceof Errors.OpRangeNotAvailableError) {
return res.sendStatus(422) // Unprocessable Entity
} else if (error instanceof Errors.FileTooLargeError) {
return res.sendStatus(413)
} else if (error.statusCode === 413) {
return res.status(413).send('request entity too large')
} else {
logger.error({ err: error, req }, 'request errored')
return res.status(500).send('Oops, something went wrong')
}
})
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const shutdownCleanly = signal => () => {
logger.info({ signal }, 'received interrupt, cleaning up')
if (Settings.shuttingDown) {
logger.warn({ signal }, 'already shutting down, ignoring interrupt')
return
}
Settings.shuttingDown = true
// record the time we started shutting down
Settings.shutDownTime = Date.now()
setTimeout(() => {
logger.info({ signal }, 'shutting down')
process.exit()
}, Settings.delayShutdownMs)
}
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const watchForEvent = eventName => {
docUpdaterRedisClient.on(eventName, e => {
console.log(`redis event: ${eventName} ${e}`) // eslint-disable-line no-console
})
}
const events = ['connect', 'ready', 'error', 'close', 'reconnecting', 'end']
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for (const eventName of events) {
watchForEvent(eventName)
}
const port =
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Settings.internal.documentupdater.port ||
(Settings.api &&
Settings.api.documentupdater &&
Settings.api.documentupdater.port) ||
3003
const host = Settings.internal.documentupdater.host || 'localhost'
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if (!module.parent) {
// Called directly
mongodb.mongoClient
.connect()
.then(() => {
app.listen(port, host, function (err) {
if (err) {
logger.fatal({ err }, `Cannot bind to ${host}:${port}. Exiting.`)
process.exit(1)
}
logger.info(
`Document-updater starting up, listening on ${host}:${port}`
)
if (Settings.continuousBackgroundFlush) {
logger.info('Starting continuous background flush')
DeleteQueueManager.startBackgroundFlush()
}
})
})
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.catch(err => {
logger.fatal({ err }, 'Cannot connect to mongo. Exiting.')
process.exit(1)
})
}
module.exports = app
for (const signal of [
'SIGINT',
'SIGHUP',
'SIGQUIT',
'SIGUSR1',
'SIGUSR2',
'SIGTERM',
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'SIGABRT',
]) {
process.on(signal, shutdownCleanly(signal))
}
function longerTimeout(req, res, next) {
res.setTimeout(6 * 60 * 1000)
next()
}