mirror of
https://github.com/overleaf/overleaf.git
synced 2024-11-07 20:31:06 -05:00
393 lines
13 KiB
CoffeeScript
393 lines
13 KiB
CoffeeScript
define [
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"utils/EventEmitter"
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"ide/editor/ShareJsDoc"
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"ide/review-panel/RangesTracker"
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], (EventEmitter, ShareJsDoc, RangesTracker) ->
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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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sl_console.log "[getDocument] Creating new document instance for #{doc_id}"
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@openDocs[doc_id] = new Document(ide, doc_id)
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else
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sl_console.log "[getDocument] Returning existing document instance for #{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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@ide.$scope.$emit 'document:opened', @doc
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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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@ide.$scope.$emit 'document:closed', @doc
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submitOp: (args...) -> @doc?.submitOp(args...)
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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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getRecentAck: () ->
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@doc?.getRecentAck()
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getOpSize: (op) ->
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@doc?.getOpSize(op)
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hasBufferedOps: () ->
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@doc?.hasBufferedOps()
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setTrackingChanges: (track_changes) ->
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@doc.track_changes = track_changes
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getTrackingChanges: () ->
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!!@doc.track_changes
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setTrackChangesIdSeeds: (id_seeds) ->
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@doc.track_changes_id_seeds = id_seeds
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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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sl_console.log "[leave] Doc has buffered ops, pushing callback for later"
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@_leaveCallbacks ||= []
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@_leaveCallbacks.push callback
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else if !@connected
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sl_console.log "[leave] Not connected, returning now"
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callback()
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else
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sl_console.log "[leave] Leaving now"
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@_leaveDoc(callback)
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flush: () ->
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@doc?.flushPendingOps()
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chaosMonkey: (line = 0, char = "a") ->
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orig = char
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copy = null
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pos = 0
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timer = () =>
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unless copy? and copy.length
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copy = orig.slice() + ' ' + new Date() + '\n'
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line += if Math.random() > 0.1 then 1 else -2
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line = 0 if line < 0
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pos = 0
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char = copy[0]
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copy = copy.slice(1)
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@ace.session.insert({row: line, column: pos}, char)
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pos += 1
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@_cm = setTimeout timer, 100 + if Math.random() < 0.1 then 1000 else 0
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@_cm = timer()
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clearChaosMonkey: () ->
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clearTimeout @_cm
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MAX_PENDING_OP_SIZE: 30 # pending ops bigger than this are always considered unsaved
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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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recentAck = @getRecentAck()
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pendingOpSize = pendingOp? && @getOpSize(pendingOp)
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if !inflightOp? and !pendingOp?
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# there's nothing going on, this is ok.
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saved = true
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sl_console.log "[pollSavedStatus] no inflight or pending ops"
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else if inflightOp? and inflightOp == @oldInflightOp
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# The same inflight op has been sitting unacked since we
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# last checked, this is bad.
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saved = false
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sl_console.log "[pollSavedStatus] inflight op is same as before"
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else if pendingOp? and recentAck && pendingOpSize < @MAX_PENDING_OP_SIZE
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# There is an op waiting to go to server but it is small and
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# within the flushDelay, this is ok for now.
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saved = true
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sl_console.log "[pollSavedStatus] pending op (small with recent ack) assume ok", pendingOp, pendingOpSize
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else
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# In any other situation, assume the document is unsaved.
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saved = false
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sl_console.log "[pollSavedStatus] assuming not saved (inflightOp?: #{inflightOp?}, pendingOp?: #{pendingOp?})"
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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 window.disconnectOnAck? and Math.random() < window.disconnectOnAck
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sl_console.log "Disconnecting on ack", update
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window._ide.socket.socket.disconnect()
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# Pretend we never received the ack
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return
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if window.dropAcks? and Math.random() < window.dropAcks
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if !update.op? # Only drop our own acks, not collaborator updates
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sl_console.log "Simulating a lost ack", 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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sl_console.log '[onDisconnect] disconnecting'
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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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sl_console.log "[onReconnect] reconnected (joined project)"
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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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sl_console.log "[onReconnect] Rejoining (wantToBeJoined: #{@wantToBeJoined} OR hasBufferedOps: #{@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(), { encodeRanges: true }, (error, docLines, version, updates, ranges) =>
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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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@_decodeRanges(ranges)
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@_catchUpRanges(ranges?.changes, ranges?.comments)
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callback()
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else
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@ide.socket.emit 'joinDoc', @doc_id, { encodeRanges: true }, (error, docLines, version, updates, ranges) =>
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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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@_decodeRanges(ranges)
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@ranges = new RangesTracker(ranges?.changes, ranges?.comments)
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@_bindToShareJsDocEvents()
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callback()
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_decodeRanges: (ranges) ->
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decodeFromWebsockets = (text) -> decodeURIComponent(escape(text))
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try
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for change in ranges.changes or []
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change.op.i = decodeFromWebsockets(change.op.i) if change.op.i
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change.op.d = decodeFromWebsockets(change.op.d) if change.op.d
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for comment in ranges.comments or []
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comment.op.c = decodeFromWebsockets(comment.op.c)
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catch err
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console.log(err)
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_leaveDoc: (callback = (error) ->) ->
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sl_console.log '[_leaveDoc] Sending leaveDoc request'
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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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sl_console.log '[_leaveDoc] Calling buffered callback', callback
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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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if Document.openDocs[@doc_id] == @
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sl_console.log "[_cleanUp] Removing self (#{@doc_id}) from in openDocs"
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delete Document.openDocs[@doc_id]
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else
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# It's possible that this instance has error, and the doc has been reloaded.
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# This creates a new instance in Document.openDoc with the same id. We shouldn't
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# clear it because it's not this instance.
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sl_console.log "[_cleanUp] New instance of (#{@doc_id}) created. Not removing"
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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", (args...) =>
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@ide.pushEvent "remoteop",
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doc_id: @doc_id
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@trigger "remoteop", args...
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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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@ide.$scope.$emit "ide:opAcknowledged",
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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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@_onError new Error("op timed out"), {op: op}
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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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@doc.on "change", (ops, oldSnapshot, msg) =>
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@_applyOpsToRanges(ops, oldSnapshot, msg)
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@doc.on "flipped_pending_to_inflight", () =>
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@trigger "flipped_pending_to_inflight"
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_onError: (error, meta = {}) ->
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meta.doc_id = @doc_id
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sl_console.log "ShareJS error", error, meta
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ga?('send', 'event', 'error', "shareJsError", "#{error.message} - #{@ide.socket.socket.transport.name}" )
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@doc?.clearInflightAndPendingOps()
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@trigger "error", error, meta
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# The clean up should run after the error is triggered because the error triggers a
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# disconnect. If we run the clean up first, we remove our event handlers and miss
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# the disconnect event, which means we try to leaveDoc when the connection comes back.
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# This could intefere with the new connection of a new instance of this document.
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@_cleanUp()
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_applyOpsToRanges: (ops = [], oldSnapshot, msg) ->
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track_changes_as = null
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remote_op = msg?
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if msg?.meta?.tc?
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old_id_seed = @ranges.getIdSeed()
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@ranges.setIdSeed(msg.meta.tc)
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if remote_op and msg.meta?.tc
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track_changes_as = msg.meta.user_id
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else if !remote_op and @track_changes_as?
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track_changes_as = @track_changes_as
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@ranges.track_changes = track_changes_as?
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for op in ops
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@ranges.applyOp op, { user_id: track_changes_as }
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if old_id_seed?
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@ranges.setIdSeed(old_id_seed)
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if remote_op
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# With remote ops, Ace hasn't been updated when we receive this op,
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# so defer updating track changes until it has
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setTimeout () => @emit "ranges:dirty"
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else
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@emit "ranges:dirty"
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_catchUpRanges: (changes = [], comments = []) ->
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# We've just been given the current server's ranges, but need to apply any local ops we have.
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# Reset to the server state then apply our local ops again.
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@emit "ranges:clear"
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@ranges.changes = changes
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@ranges.comments = comments
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@ranges.track_changes = @doc.track_changes
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for op in @doc.getInflightOp() or []
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@ranges.setIdSeed(@doc.track_changes_id_seeds.inflight)
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@ranges.applyOp(op, { user_id: @track_changes_as })
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for op in @doc.getPendingOp() or []
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@ranges.setIdSeed(@doc.track_changes_id_seeds.pending)
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@ranges.applyOp(op, { user_id: @track_changes_as })
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@emit "ranges:redraw"
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