overleaf/services/web/public/coffee/ide/connection/ConnectionManager.coffee

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define [], () ->
class ConnectionManager
constructor: (@ide, @$scope) ->
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@connected = false
@$scope.connection =
reconnecting: false
# If we need to force everyone to reload the editor
forced_disconnect: false
@$scope.tryReconnectNow = () =>
@tryReconnect()
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@$scope.$on "editor:change", () =>
@lastUpdated = new Date()
@ide.socket = io.connect null,
reconnect: false
"force new connection": true
@ide.socket.on "connect", () =>
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@connected = true
@ide.pushEvent("connected")
@$scope.$apply () =>
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@$scope.connection.reconnecting = false
if @$scope.state.loading
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@$scope.state.load_progress = 70
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setTimeout(() =>
@joinProject()
, 100)
@ide.socket.on 'disconnect', () =>
@connected = false
@ide.pushEvent("disconnected")
@$scope.$apply () =>
@$scope.connection.reconnecting = false
setTimeout(=>
ga('send', 'event', 'editor-interaction', 'disconnect')
, 2000)
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if !$scope.connection.forced_disconnect
@startAutoReconnectCountdown()
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@ide.socket.on 'forceDisconnect', (message) =>
@$scope.$apply () =>
@$scope.connection.forced_disconnect = true
@socket.disconnect()
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joinProject: () ->
@ide.socket.emit 'joinProject', {
project_id: @ide.project_id
}, (err, project, permissionsLevel, protocolVersion) =>
if @$scope.protocolVersion? and @$scope.protocolVersion != protocolVersion
location.reload(true)
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@$scope.$apply () =>
@$scope.protocolVersion = protocolVersion
@$scope.project = project
@$scope.permissionsLevel = permissionsLevel
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@$scope.state.load_progress = 100
@$scope.state.loading = false
@$scope.$broadcast "project:joined"
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reconnectImmediately: () ->
@disconnect()
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@tryReconnect()
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disconnect: () ->
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@ide.socket.disconnect()
startAutoReconnectCountdown: () ->
twoMinutes = 2 * 60 * 1000
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if @lastUpdated? and new Date() - @lastUpdated > twoMinutes
# between 1 minute and 3 minutes
countdown = 60 + Math.floor(Math.random() * 120)
else
countdown = 3 + Math.floor(Math.random() * 7)
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@$scope.$apply () =>
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@$scope.connection.reconnecting = false
@$scope.connection.reconnection_countdown = countdown
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setTimeout(=>
if !@connected
@timeoutId = setTimeout (=> @decreaseCountdown()), 1000
, 200)
cancelReconnect: () ->
clearTimeout @timeoutId if @timeoutId?
decreaseCountdown: () ->
return if !@$scope.connection.reconnection_countdown?
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@$scope.$apply () =>
@$scope.connection.reconnection_countdown--
if @$scope.connection.reconnection_countdown <= 0
@$scope.$apply () =>
@tryReconnect()
else
@timeoutId = setTimeout (=> @decreaseCountdown()), 1000
tryReconnect: () ->
@cancelReconnect()
@$scope.connection.reconnecting = true
delete @$scope.connection.reconnection_countdown
@ide.socket.socket.reconnect()
setTimeout (=> @startAutoReconnectCountdown() if !@connected), 2000
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