overleaf/services/history-v1/app.js

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4.6 KiB
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'use strict'
/* eslint-disable no-console */
// Metrics must be initialized before importing anything else
require('@overleaf/metrics/initialize')
const config = require('config')
const Events = require('events')
const BPromise = require('bluebird')
const express = require('express')
const helmet = require('helmet')
const HTTPStatus = require('http-status')
const logger = require('@overleaf/logger')
const Metrics = require('@overleaf/metrics')
const bodyParser = require('body-parser')
const swaggerTools = require('swagger-tools')
const swaggerDoc = require('./api/swagger')
const security = require('./api/app/security')
const healthChecks = require('./api/controllers/health_checks')
const { mongodb, loadGlobalBlobs } = require('./storage')
const path = require('path')
Events.setMaxListeners(20)
const app = express()
module.exports = app
logger.initialize('history-v1')
Metrics.open_sockets.monitor()
Metrics.injectMetricsRoute(app)
app.use(Metrics.http.monitor(logger))
Metrics.leaked_sockets.monitor(logger)
// We may have fairly large JSON bodies when receiving large Changes. Clients
// may have to handle 413 status codes and try creating files instead of sending
// text content in changes.
app.use(bodyParser.json({ limit: '4MB' }))
app.use(
bodyParser.urlencoded({
extended: false,
})
)
security.setupSSL(app)
security.setupBasicHttpAuthForSwaggerDocs(app)
const HTTP_REQUEST_TIMEOUT = parseInt(config.get('httpRequestTimeout'), 10)
app.use(function (req, res, next) {
res.setTimeout(HTTP_REQUEST_TIMEOUT)
next()
})
app.get('/', function (req, res) {
res.send('')
})
app.get('/status', healthChecks.status)
app.get('/health_check', healthChecks.healthCheck)
function setupSwagger() {
return new BPromise(function (resolve) {
swaggerTools.initializeMiddleware(swaggerDoc, function (middleware) {
app.use(middleware.swaggerMetadata())
app.use(middleware.swaggerSecurity(security.getSwaggerHandlers()))
app.use(middleware.swaggerValidator())
app.use(
middleware.swaggerRouter({
controllers: path.join(__dirname, 'api/controllers'),
useStubs: app.get('env') === 'development',
})
)
app.use(middleware.swaggerUi())
resolve()
})
})
}
function setupErrorHandling() {
app.use(function (req, res, next) {
const err = new Error('Not Found')
err.status = HTTPStatus.NOT_FOUND
return next(err)
})
// Handle Swagger errors.
app.use(function (err, req, res, next) {
if (res.headersSent) {
return next(err)
}
if (err.code === 'SCHEMA_VALIDATION_FAILED') {
logger.error(err)
return res.status(HTTPStatus.UNPROCESSABLE_ENTITY).json(err.results)
}
if (err.code === 'INVALID_TYPE' || err.code === 'PATTERN') {
logger.error(err)
return res.status(HTTPStatus.UNPROCESSABLE_ENTITY).json({
message: 'invalid type: ' + err.paramName,
})
}
if (err.code === 'ENUM_MISMATCH') {
return res.status(HTTPStatus.UNPROCESSABLE_ENTITY).json({
message: 'invalid enum value: ' + err.paramName,
})
}
if (err.code === 'REQUIRED') {
return res.status(HTTPStatus.UNPROCESSABLE_ENTITY).json({
message: err.message,
})
}
next(err)
})
app.use(function (err, req, res, next) {
logger.error(err)
if (res.headersSent) {
return next(err)
}
// Handle errors that specify a statusCode. Some come from our code. Some
// bubble up from AWS SDK, but they sometimes have the statusCode set to
// 200, notably some InternalErrors and TimeoutErrors, so we have to guard
// against that. We also check `status`, but `statusCode` is preferred.
const statusCode = err.statusCode || err.status
if (statusCode && statusCode >= 400 && statusCode < 600) {
res.status(statusCode)
} else {
res.status(HTTPStatus.INTERNAL_SERVER_ERROR)
}
const sendErrorToClient = app.get('env') === 'development'
res.json({
message: err.message,
error: sendErrorToClient ? err : {},
})
})
}
app.setup = async function appSetup() {
await mongodb.client.connect()
logger.info('Connected to MongoDB')
await loadGlobalBlobs()
logger.info('Global blobs loaded')
app.use(helmet())
await setupSwagger()
setupErrorHandling()
}
async function startApp() {
await app.setup()
const port = parseInt(process.env.PORT, 10) || 3100
app.listen(port, err => {
if (err) {
console.error(err)
process.exit(1)
}
Metrics.event_loop.monitor(logger)
Metrics.memory.monitor(logger)
})
}
// Run this if we're called directly
if (!module.parent) {
startApp().catch(err => {
console.error(err)
process.exit(1)
})
}