mirror of
https://github.com/overleaf/overleaf.git
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af85c83877
Add in 5 second delay between flushing updates when only a single user is editing a document. As soon as an update is received from another user we switch to sending updates immediately again so there is no latency between collaborators. The logic applies to individual docs, so two users can be editing different docs and will still buffer updates since they will not affect each other.
260 lines
7.1 KiB
CoffeeScript
260 lines
7.1 KiB
CoffeeScript
define [
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"utils/EventEmitter"
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"ide/editor/ShareJsDoc"
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], (EventEmitter, ShareJsDoc) ->
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class Document extends EventEmitter
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@getDocument: (ide, doc_id) ->
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@openDocs ||= {}
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if !@openDocs[doc_id]?
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@openDocs[doc_id] = new Document(ide, doc_id)
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return @openDocs[doc_id]
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@hasUnsavedChanges: () ->
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for doc_id, doc of (@openDocs or {})
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return true if doc.hasBufferedOps()
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return false
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@flushAll: () ->
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for doc_id, doc of @openDocs
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doc.flush()
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constructor: (@ide, @doc_id) ->
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@connected = @ide.socket.socket.connected
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@joined = false
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@wantToBeJoined = false
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@_checkConsistency = _.bind(@_checkConsistency, @)
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@inconsistentCount = 0
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@_bindToEditorEvents()
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@_bindToSocketEvents()
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attachToAce: (@ace) ->
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@doc?.attachToAce(@ace)
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editorDoc = @ace.getSession().getDocument()
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editorDoc.on "change", @_checkConsistency
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detachFromAce: () ->
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@doc?.detachFromAce()
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editorDoc = @ace?.getSession().getDocument()
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editorDoc?.off "change", @_checkConsistency
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_checkConsistency: () ->
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# We've been seeing a lot of errors when I think there shouldn't be
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# any, which may be related to this check happening before the change is
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# applied. If we use a timeout, hopefully we can reduce this.
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setTimeout () =>
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editorValue = @ace?.getValue()
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sharejsValue = @doc?.getSnapshot()
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if editorValue != sharejsValue
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@inconsistentCount++
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else
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@inconsistentCount = 0
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if @inconsistentCount >= 3
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@_onError new Error("Editor text does not match server text")
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, 0
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getSnapshot: () ->
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@doc?.getSnapshot()
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getType: () ->
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@doc?.getType()
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getInflightOp: () ->
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@doc?.getInflightOp()
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getPendingOp: () ->
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@doc?.getPendingOp()
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hasBufferedOps: () ->
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@doc?.hasBufferedOps()
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_bindToSocketEvents: () ->
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@_onUpdateAppliedHandler = (update) => @_onUpdateApplied(update)
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@ide.socket.on "otUpdateApplied", @_onUpdateAppliedHandler
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@_onErrorHandler = (error, update) => @_onError(error, update)
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@ide.socket.on "otUpdateError", @_onErrorHandler
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@_onDisconnectHandler = (error) => @_onDisconnect(error)
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@ide.socket.on "disconnect", @_onDisconnectHandler
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_bindToEditorEvents: () ->
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onReconnectHandler = (update) =>
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@_onReconnect(update)
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@_unsubscribeReconnectHandler = @ide.$scope.$on "project:joined", onReconnectHandler
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_unBindFromEditorEvents: () ->
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@_unsubscribeReconnectHandler()
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_unBindFromSocketEvents: () ->
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@ide.socket.removeListener "otUpdateApplied", @_onUpdateAppliedHandler
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@ide.socket.removeListener "otUpdateError", @_onErrorHandler
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@ide.socket.removeListener "disconnect", @_onDisconnectHandler
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leaveAndCleanUp: () ->
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@leave (error) =>
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@_cleanUp()
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join: (callback = (error) ->) ->
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@wantToBeJoined = true
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@_cancelLeave()
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if @connected
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return @_joinDoc callback
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else
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@_joinCallbacks ||= []
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@_joinCallbacks.push callback
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leave: (callback = (error) ->) ->
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@wantToBeJoined = false
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@_cancelJoin()
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if (@doc? and @doc.hasBufferedOps())
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@_leaveCallbacks ||= []
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@_leaveCallbacks.push callback
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else if !@connected
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callback()
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else
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@_leaveDoc(callback)
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flush: () ->
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@doc?.flushPendingOps()
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pollSavedStatus: () ->
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# returns false if doc has ops waiting to be acknowledged or
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# sent that haven't changed since the last time we checked.
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# Otherwise returns true.
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inflightOp = @getInflightOp()
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pendingOp = @getPendingOp()
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if !inflightOp? and !pendingOp?
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# there's nothing going on
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saved = true
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else if inflightOp == @oldInflightOp
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saved = false
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else if pendingOp?
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saved = false
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else
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saved = true
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@oldInflightOp = inflightOp
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return saved
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_cancelLeave: () ->
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if @_leaveCallbacks?
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delete @_leaveCallbacks
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_cancelJoin: () ->
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if @_joinCallbacks?
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delete @_joinCallbacks
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_onUpdateApplied: (update) ->
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@ide.pushEvent "received-update",
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doc_id: @doc_id
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remote_doc_id: update?.doc
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wantToBeJoined: @wantToBeJoined
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update: update
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if Math.random() < (@ide.disconnectRate or 0)
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console.log "Simulating disconnect"
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@ide.connectionManager.disconnect()
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return
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if Math.random() < (@ide.ignoreRate or 0)
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console.log "Simulating lost update"
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return
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if update?.doc == @doc_id and @doc?
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@doc.processUpdateFromServer update
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if !@wantToBeJoined
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@leave()
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_onDisconnect: () ->
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@connected = false
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@joined = false
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@doc?.updateConnectionState "disconnected"
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_onReconnect: () ->
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@ide.pushEvent "reconnected:afterJoinProject"
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@connected = true
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if @wantToBeJoined or @doc?.hasBufferedOps()
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@_joinDoc (error) =>
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return @_onError(error) if error?
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@doc.updateConnectionState "ok"
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@doc.flushPendingOps()
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@_callJoinCallbacks()
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_callJoinCallbacks: () ->
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for callback in @_joinCallbacks or []
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callback()
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delete @_joinCallbacks
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_joinDoc: (callback = (error) ->) ->
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if @doc?
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@ide.socket.emit 'joinDoc', @doc_id, @doc.getVersion(), (error, docLines, version, updates) =>
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return callback(error) if error?
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@joined = true
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@doc.catchUp( updates )
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callback()
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else
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@ide.socket.emit 'joinDoc', @doc_id, (error, docLines, version) =>
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return callback(error) if error?
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@joined = true
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@doc = new ShareJsDoc @doc_id, docLines, version, @ide.socket
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@_bindToShareJsDocEvents()
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callback()
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_leaveDoc: (callback = (error) ->) ->
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@ide.socket.emit 'leaveDoc', @doc_id, (error) =>
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return callback(error) if error?
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@joined = false
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for callback in @_leaveCallbacks or []
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callback(error)
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delete @_leaveCallbacks
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callback(error)
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_cleanUp: () ->
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delete Document.openDocs[@doc_id]
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@_unBindFromEditorEvents()
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@_unBindFromSocketEvents()
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_bindToShareJsDocEvents: () ->
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@doc.on "error", (error, meta) => @_onError error, meta
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@doc.on "externalUpdate", (update) =>
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@ide.pushEvent "externalUpdate",
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doc_id: @doc_id
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@trigger "externalUpdate", update
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@doc.on "remoteop", () =>
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@ide.pushEvent "remoteop",
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doc_id: @doc_id
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@trigger "remoteop"
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@doc.on "op:sent", (op) =>
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@ide.pushEvent "op:sent",
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doc_id: @doc_id
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op: op
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@trigger "op:sent"
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@doc.on "op:acknowledged", (op) =>
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@ide.pushEvent "op:acknowledged",
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doc_id: @doc_id
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op: op
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@trigger "op:acknowledged"
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@doc.on "op:timeout", (op) =>
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@ide.pushEvent "op:timeout",
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doc_id: @doc_id
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op: op
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@trigger "op:timeout"
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ga?('send', 'event', 'error', "op timeout", "Op was now acknowledged - #{@ide.socket.socket.transport.name}" )
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@ide.connectionManager.reconnectImmediately()
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@doc.on "flush", (inflightOp, pendingOp, version) =>
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@ide.pushEvent "flush",
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doc_id: @doc_id,
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inflightOp: inflightOp,
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pendingOp: pendingOp
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v: version
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_onError: (error, meta = {}) ->
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console.error "ShareJS error", error, meta
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ga?('send', 'event', 'error', "shareJsError", "#{error.message} - #{@ide.socket.socket.transport.name}" )
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@ide.socket.disconnect()
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meta.doc_id = @doc_id
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@ide.reportError(error, meta)
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@doc?.clearInflightAndPendingOps()
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@_cleanUp()
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@trigger "error", error
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