overleaf/services/web/frontend/js/ide/connection/ConnectionManager.js

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// TODO: This file was created by bulk-decaffeinate.
// Fix any style issues and re-enable lint.
/*
* decaffeinate suggestions:
* DS102: Remove unnecessary code created because of implicit returns
* DS206: Consider reworking classes to avoid initClass
* DS207: Consider shorter variations of null checks
* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
*/
/* global io */
import SocketIoShim from './SocketIoShim'
let ConnectionManager
const ONEHOUR = 1000 * 60 * 60
let transport = 'handshake'
export default (ConnectionManager = (function() {
ConnectionManager = class ConnectionManager {
static initClass() {
this.prototype.disconnectAfterMs = ONEHOUR * 24
this.prototype.lastUserAction = new Date()
this.prototype.MIN_RETRY_INTERVAL = 1000 // ms, rate limit on reconnects for user clicking "try now"
this.prototype.BACKGROUND_RETRY_INTERVAL = 5 * 1000
this.prototype.JOIN_PROJECT_RETRY_INTERVAL = 5000
this.prototype.JOIN_PROJECT_MAX_RETRY_INTERVAL = 60000
this.prototype.RECONNECT_GRACEFULLY_RETRY_INTERVAL = 5000 // ms
this.prototype.MAX_RECONNECT_GRACEFULLY_INTERVAL = 45 * 1000
}
constructor(ide, $scope, eventTracking) {
this.ide = ide
this.$scope = $scope
this.wsUrl = ide.wsUrl || null // websocket url (if defined)
if (typeof io === 'undefined' || io === null) {
if (this.wsUrl && !window.location.href.match(/ws=fallback/)) {
// if we tried to boot from a custom real-time backend and failed,
// try reloading and falling back to the siteUrl
window.location = window.location.href + '?ws=fallback'
}
console.error(
'Socket.io javascript not loaded. Please check that the real-time service is running and accessible.'
)
this.ide.socket = SocketIoShim.stub()
this.$scope.$apply(() => {
return (this.$scope.state.error =
'Could not connect to websocket server :(')
})
return
}
setInterval(() => {
return this.disconnectIfInactive()
}, ONEHOUR)
// trigger a reconnect immediately if network comes back online
window.addEventListener('online', () => {
sl_console.log('[online] browser notified online')
if (!this.connected) {
return this.tryReconnectWithRateLimit({ force: true })
}
})
this.userIsLeavingPage = false
window.addEventListener('beforeunload', () => {
this.userIsLeavingPage = true
}) // Don't return true or it will show a pop up
this.connected = false
this.userIsInactive = false
this.gracefullyReconnecting = false
this.joinProjectRetryInterval = this.JOIN_PROJECT_RETRY_INTERVAL
this.$scope.connection = {
debug: sl_debugging,
reconnecting: false,
stillReconnecting: false,
// If we need to force everyone to reload the editor
forced_disconnect: false,
inactive_disconnect: false,
jobId: 0
}
this.$scope.tryReconnectNow = () => {
// user manually requested reconnection via "Try now" button
return this.tryReconnectWithRateLimit({ force: true })
}
this.$scope.$on('cursor:editor:update', () => {
this.lastUserAction = new Date() // time of last edit
if (!this.connected) {
// user is editing, try to reconnect
return this.tryReconnectWithRateLimit()
}
})
document.querySelector('body').addEventListener('click', e => {
if (!this.connected && e.target.id !== 'try-reconnect-now-button') {
// user is editing, try to reconnect
return this.tryReconnectWithRateLimit()
}
})
// initial connection attempt
this.updateConnectionManagerState('connecting')
let parsedURL
try {
parsedURL = new URL(this.wsUrl || '/socket.io', window.location)
} catch (e) {
// hello IE11
if (
this.wsUrl &&
this.wsUrl.indexOf('/') !== 0 &&
!window.location.href.match(/ws=fallback/)
) {
// do not even try parsing the wsUrl, use the fallback
window.location = window.location.href + '?ws=fallback'
}
parsedURL = {
origin: null,
pathname: this.wsUrl || '/socket.io'
}
}
this.ide.socket = SocketIoShim.connect(
parsedURL.origin,
{
resource: parsedURL.pathname.slice(1),
reconnect: false,
'connect timeout': 30 * 1000,
'force new connection': true
}
)
const socket = this.ide.socket
socket.on('error', reportTransportError)
socket.on('connect_failed', reportTransportError)
socket.on('connecting', name => {
transport = name
socket.removeListener('error', reportTransportError)
socket.on('error', reportTransportError)
})
socket.on('connectionAccepted', () => {
// we have reached the real-time layer. ignore errors from now on.
socket.removeListener('error', reportTransportError)
socket.removeListener('connect_failed', reportTransportError)
})
function reportTransportError(error) {
socket.removeListener('error', reportTransportError)
socket.removeListener('connect_failed', reportTransportError)
if (typeof error === 'undefined') {
error = 'undefined'
} else if (typeof error !== 'string') {
try {
error = JSON.stringify(error)
} catch (e) {
error = `JSON_serialize_failed: ${e.message}`
}
}
if (transport === 'websocket' && error === '{"isTrusted":true}') {
error = 'hidden'
} else if (error.indexOf('<title>500') !== -1) {
error = '500'
} else if (error.indexOf('<title>502') !== -1) {
error = '502'
} else if (error.indexOf('<title>503') !== -1) {
error = '503'
} else if (error.length > 97) {
error = error.slice(0, 97) + '...'
}
eventTracking.sendMBSampled('socket-io-error', { transport, error })
}
this.ide.socket.reportTransportError = reportTransportError
// handle network-level websocket errors (e.g. failed dns lookups)
let connectionAttempt = 1
let connectionErrorHandler = err => {
if (
window.wsRetryHandshake &&
connectionAttempt++ < window.wsRetryHandshake
) {
return setTimeout(() => this.ide.socket.socket.connect(), 100)
}
this.updateConnectionManagerState('error')
sl_console.log('socket.io error', err)
if (this.wsUrl && !window.location.href.match(/ws=fallback/)) {
// if we tried to load a custom websocket location and failed
// try reloading and falling back to the siteUrl
window.location = window.location.href + '?ws=fallback'
} else {
this.connected = false
return this.$scope.$apply(() => {
return (this.$scope.state.error =
"Unable to connect, please view the <u><a href='/learn/Kb/Connection_problems'>connection problems guide</a></u> to fix the issue.")
})
}
}
this.ide.socket.on('error', connectionErrorHandler)
// The "connect" event is the first event we get back. It only
// indicates that the websocket is connected, we still need to
// pass authentication to join a project.
this.ide.socket.on('connect', () => {
// state should be 'connecting'...
// remove connection error handler when connected, avoid unwanted fallbacks
this.ide.socket.removeListener('error', connectionErrorHandler)
sl_console.log('[socket.io connect] Connected')
this.updateConnectionManagerState('authenticating')
})
// The next event we should get is an authentication response
// from the server, either "connectionAccepted" or
// "connectionRejected".
this.ide.socket.on('connectionAccepted', (_, publicId) => {
this.ide.socket.publicId = publicId || this.ide.socket.socket.sessionid
// state should be 'authenticating'...
sl_console.log('[socket.io connectionAccepted] allowed to connect')
this.connected = true
this.gracefullyReconnecting = false
this.ide.pushEvent('connected')
this.updateConnectionManagerState('joining')
this.$scope.$apply(() => {
if (this.$scope.state.loading) {
return (this.$scope.state.load_progress = 70)
}
})
// we have passed authentication so we can now join the project
let connectionJobId = this.$scope.connection.jobId
setTimeout(() => {
this.joinProject(connectionJobId)
}, 100)
})
this.ide.socket.on('connectionRejected', err => {
// state should be 'authenticating'...
sl_console.log(
'[socket.io connectionRejected] session not valid or other connection error'
)
// real time sends a 'retry' message if the process was shutting down
if (err && err.message === 'retry') {
return this.tryReconnectWithRateLimit()
}
// we have failed authentication, usually due to an invalid session cookie
return this.reportConnectionError(err)
})
// Alternatively the attempt to connect can fail completely, so
// we never get into the "connect" state.
this.ide.socket.on('connect_failed', () => {
this.updateConnectionManagerState('error')
this.connected = false
return this.$scope.$apply(() => {
return (this.$scope.state.error =
"Unable to connect, please view the <u><a href='/learn/Kb/Connection_problems'>connection problems guide</a></u> to fix the issue.")
})
})
// We can get a "disconnect" event at any point after the
// "connect" event.
this.ide.socket.on('disconnect', () => {
sl_console.log('[socket.io disconnect] Disconnected')
this.connected = false
this.ide.pushEvent('disconnected')
if (!this.$scope.connection.state.match(/^waiting/)) {
if (
!this.$scope.connection.forced_disconnect &&
!this.userIsInactive
) {
this.startAutoReconnectCountdown()
} else {
this.updateConnectionManagerState('inactive')
}
}
})
// Site administrators can send the forceDisconnect event to all users
this.ide.socket.on('forceDisconnect', message => {
this.updateConnectionManagerState('inactive')
this.$scope.$apply(() => {
this.$scope.permissions.write = false
return (this.$scope.connection.forced_disconnect = true)
})
this.ide.socket.disconnect()
this.ide.showGenericMessageModal(
'Please Refresh',
`\
We're performing maintenance on Overleaf and you need to refresh the editor.
Sorry for any inconvenience.
The editor will refresh in automatically in 10 seconds.\
`
)
return setTimeout(() => location.reload(), 10 * 1000)
})
this.ide.socket.on('reconnectGracefully', () => {
sl_console.log('Reconnect gracefully')
this.reconnectGracefully()
})
}
updateConnectionManagerState(state) {
this.$scope.$apply(() => {
this.$scope.connection.jobId += 1
let jobId = this.$scope.connection.jobId
sl_console.log(
`[updateConnectionManagerState ${jobId}] from ${
this.$scope.connection.state
} to ${state}`
)
this.$scope.connection.state = state
this.$scope.connection.reconnecting = false
this.$scope.connection.stillReconnecting = false
this.$scope.connection.inactive_disconnect = false
this.$scope.connection.joining = false
this.$scope.connection.reconnection_countdown = null
if (state === 'connecting') {
// initial connection
} else if (state === 'reconnecting') {
// reconnection after a connection has failed
this.stopReconnectCountdownTimer()
this.$scope.connection.reconnecting = true
// if reconnecting takes more than 1s (it doesn't, usually) show the
// 'reconnecting...' warning
setTimeout(() => {
if (
this.$scope.connection.reconnecting &&
this.$scope.connection.jobId === jobId
) {
this.$scope.connection.stillReconnecting = true
}
}, 1000)
} else if (state === 'reconnectFailed') {
// reconnect attempt failed
} else if (state === 'authenticating') {
// socket connection has been established, trying to authenticate
} else if (state === 'joining') {
// authenticated, joining project
this.$scope.connection.joining = true
} else if (state === 'ready') {
// project has been joined
} else if (state === 'waitingCountdown') {
// disconnected and waiting to reconnect via the countdown timer
this.stopReconnectCountdownTimer()
} else if (state === 'waitingGracefully') {
// disconnected and waiting to reconnect gracefully
this.stopReconnectCountdownTimer()
} else if (state === 'inactive') {
// disconnected and not trying to reconnect (inactive)
} else if (state === 'error') {
// something is wrong
} else {
sl_console.log(
`[WARN] [updateConnectionManagerState ${jobId}] got unrecognised state ${state}`
)
}
})
}
expectConnectionManagerState(state, jobId) {
if (
this.$scope.connection.state === state &&
(!jobId || jobId === this.$scope.connection.jobId)
) {
return true
}
sl_console.log(
`[WARN] [state mismatch] expected state ${state}${
jobId ? '/' + jobId : ''
} when in ${this.$scope.connection.state}/${
this.$scope.connection.jobId
}`
)
return false
}
// Error reporting, which can reload the page if appropriate
reportConnectionError(err) {
sl_console.log('[socket.io] reporting connection error')
this.updateConnectionManagerState('error')
if (
(err != null ? err.message : undefined) === 'not authorized' ||
(err != null ? err.message : undefined) === 'invalid session'
) {
return (window.location = `/login?redir=${encodeURI(
window.location.pathname
)}`)
} else {
this.ide.socket.disconnect()
return this.ide.showGenericMessageModal(
'Something went wrong connecting',
`\
Something went wrong connecting to your project. Please refresh if this continues to happen.\
`
)
}
}
joinProject(connectionId) {
sl_console.log(`[joinProject ${connectionId}] joining...`)
// Note: if the "joinProject" message doesn't reach the server
// (e.g. if we are in a disconnected state at this point) the
// callback will never be executed
if (!this.expectConnectionManagerState('joining', connectionId)) {
sl_console.log(
`[joinProject ${connectionId}] aborting with stale connection`
)
return
}
const data = {
project_id: this.ide.project_id
}
if (window.anonymousAccessToken) {
data.anonymousAccessToken = window.anonymousAccessToken
}
this.ide.socket.emit(
'joinProject',
data,
(err, project, permissionsLevel, protocolVersion) => {
if (err != null || project == null) {
if (err.code === 'TooManyRequests') {
sl_console.log(
`[joinProject ${connectionId}] retrying: ${err.message}`
)
setTimeout(
() => this.joinProject(connectionId),
this.joinProjectRetryInterval
)
if (
this.joinProjectRetryInterval <
this.JOIN_PROJECT_MAX_RETRY_INTERVAL
) {
this.joinProjectRetryInterval += this.JOIN_PROJECT_RETRY_INTERVAL
}
return
} else {
return this.reportConnectionError(err)
}
}
this.joinProjectRetryInterval = this.JOIN_PROJECT_RETRY_INTERVAL
if (
this.$scope.protocolVersion != null &&
this.$scope.protocolVersion !== protocolVersion
) {
location.reload(true)
}
this.$scope.$apply(() => {
this.updateConnectionManagerState('ready')
this.$scope.protocolVersion = protocolVersion
this.$scope.project = project
this.$scope.permissionsLevel = permissionsLevel
this.$scope.state.load_progress = 100
this.$scope.state.loading = false
this.$scope.$broadcast('project:joined')
})
}
)
}
reconnectImmediately() {
this.disconnect()
return this.tryReconnect()
}
disconnect() {
if (this.ide.socket.socket && !this.ide.socket.socket.connected) {
sl_console.log(
'[socket.io] skipping disconnect because socket.io has not connected'
)
return
}
sl_console.log('[socket.io] disconnecting client')
return this.ide.socket.disconnect()
}
startAutoReconnectCountdown() {
this.updateConnectionManagerState('waitingCountdown')
let connectionId = this.$scope.connection.jobId
let countdown
sl_console.log('[ConnectionManager] starting autoreconnect countdown')
const twoMinutes = 2 * 60 * 1000
if (
this.lastUserAction != null &&
new Date() - this.lastUserAction > twoMinutes
) {
// between 1 minute and 3 minutes
countdown = 60 + Math.floor(Math.random() * 120)
} else {
countdown = 3 + Math.floor(Math.random() * 7)
}
if (this.userIsLeavingPage) {
// user will have pressed refresh or back etc
return
}
this.$scope.$apply(() => {
this.$scope.connection.reconnecting = false
this.$scope.connection.stillReconnecting = false
this.$scope.connection.joining = false
this.$scope.connection.reconnection_countdown = countdown
})
setTimeout(() => {
if (!this.connected && !this.countdownTimeoutId) {
this.countdownTimeoutId = setTimeout(
() => this.decreaseCountdown(connectionId),
1000
)
}
}, 200)
}
stopReconnectCountdownTimer() {
// clear timeout and set to null so we know there is no countdown running
if (this.countdownTimeoutId != null) {
sl_console.log(
'[ConnectionManager] cancelling existing reconnect timer'
)
clearTimeout(this.countdownTimeoutId)
this.countdownTimeoutId = null
}
}
decreaseCountdown(connectionId) {
this.countdownTimeoutId = null
if (this.$scope.connection.reconnection_countdown == null) {
return
}
if (
!this.expectConnectionManagerState('waitingCountdown', connectionId)
) {
sl_console.log(
`[ConnectionManager] Aborting stale countdown ${connectionId}`
)
return
}
sl_console.log(
'[ConnectionManager] decreasing countdown',
this.$scope.connection.reconnection_countdown
)
this.$scope.$apply(() => {
this.$scope.connection.reconnection_countdown--
})
if (this.$scope.connection.reconnection_countdown <= 0) {
this.$scope.connection.reconnecting = false
this.$scope.$apply(() => {
this.tryReconnect()
})
} else {
this.countdownTimeoutId = setTimeout(
() => this.decreaseCountdown(connectionId),
1000
)
}
}
tryReconnect() {
sl_console.log('[ConnectionManager] tryReconnect')
if (this.connected || this.$scope.connection.reconnecting) {
return
}
this.updateConnectionManagerState('reconnecting')
sl_console.log('[ConnectionManager] Starting new connection')
const removeHandler = () => {
this.ide.socket.removeListener('error', handleFailure)
this.ide.socket.removeListener('connect', handleSuccess)
}
const handleFailure = () => {
sl_console.log('[ConnectionManager] tryReconnect: failed')
removeHandler()
this.updateConnectionManagerState('reconnectFailed')
this.tryReconnectWithRateLimit({ force: true })
}
const handleSuccess = () => {
sl_console.log('[ConnectionManager] tryReconnect: success')
removeHandler()
}
this.ide.socket.on('error', handleFailure)
this.ide.socket.on('connect', handleSuccess)
const reportTransportError = this.ide.socket.reportTransportError
this.ide.socket.on('error', reportTransportError)
this.ide.socket.on('connect_failed', reportTransportError)
transport = 'handshake'
// use socket.io connect() here to make a single attempt, the
// reconnect() method makes multiple attempts
this.ide.socket.socket.connect()
// record the time of the last attempt to connect
this.lastConnectionAttempt = new Date()
}
tryReconnectWithRateLimit(options) {
// bail out if the reconnect is already in progress
if (this.$scope.connection.reconnecting || this.connected) {
return
}
// bail out if we are going to reconnect soon anyway
const reconnectingSoon =
this.$scope.connection.reconnection_countdown != null &&
this.$scope.connection.reconnection_countdown <= 5
const clickedTryNow = options != null ? options.force : undefined // user requested reconnection
if (reconnectingSoon && !clickedTryNow) {
return
}
// bail out if we tried reconnecting recently
const allowedInterval = clickedTryNow
? this.MIN_RETRY_INTERVAL
: this.BACKGROUND_RETRY_INTERVAL
if (
this.lastConnectionAttempt != null &&
new Date() - this.lastConnectionAttempt < allowedInterval
) {
if (this.$scope.connection.state !== 'waitingCountdown') {
this.startAutoReconnectCountdown()
}
return
}
this.tryReconnect()
}
disconnectIfInactive() {
this.userIsInactive =
new Date() - this.lastUserAction > this.disconnectAfterMs
if (this.userIsInactive && this.connected) {
this.disconnect()
return this.$scope.$apply(() => {
return (this.$scope.connection.inactive_disconnect = true)
}) // 5 minutes
}
}
reconnectGracefully(force) {
if (this.reconnectGracefullyStarted == null) {
this.reconnectGracefullyStarted = new Date()
} else {
if (!force) {
sl_console.log(
'[reconnectGracefully] reconnection is already in process, so skipping'
)
return
}
}
const userIsInactive =
new Date() - this.lastUserAction >
this.RECONNECT_GRACEFULLY_RETRY_INTERVAL
const maxIntervalReached =
new Date() - this.reconnectGracefullyStarted >
this.MAX_RECONNECT_GRACEFULLY_INTERVAL
if (userIsInactive || maxIntervalReached) {
sl_console.log(
"[reconnectGracefully] User didn't do anything for last 5 seconds, reconnecting"
)
this._reconnectGracefullyNow()
} else {
sl_console.log(
'[reconnectGracefully] User is working, will try again in 5 seconds'
)
this.updateConnectionManagerState('waitingGracefully')
setTimeout(() => {
this.reconnectGracefully(true)
}, this.RECONNECT_GRACEFULLY_RETRY_INTERVAL)
}
}
_reconnectGracefullyNow() {
this.gracefullyReconnecting = true
this.reconnectGracefullyStarted = null
// Clear cookie so we don't go to the same backend server
$.cookie('SERVERID', '', { expires: -1, path: '/' })
return this.reconnectImmediately()
}
}
ConnectionManager.initClass()
return ConnectionManager
})())