mirror of
https://github.com/overleaf/overleaf.git
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190 lines
6.4 KiB
CoffeeScript
190 lines
6.4 KiB
CoffeeScript
define [
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"utils/EventEmitter"
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"libs/sharejs"
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], (EventEmitter, ShareJs) ->
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SINGLE_USER_FLUSH_DELAY = 1000 #ms
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class ShareJsDoc extends EventEmitter
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constructor: (@doc_id, docLines, version, @socket) ->
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# Dencode any binary bits of data
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# See http://ecmanaut.blogspot.co.uk/2006/07/encoding-decoding-utf8-in-javascript.html
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@type = "text"
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docLines = (decodeURIComponent(escape(line)) for line in docLines)
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snapshot = docLines.join("\n")
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@track_changes = false
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@connection = {
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send: (update) =>
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@_startInflightOpTimeout(update)
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if window.disconnectOnUpdate? and Math.random() < window.disconnectOnUpdate
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sl_console.log "Disconnecting on update", update
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window._ide.socket.socket.disconnect()
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if window.dropUpdates? and Math.random() < window.dropUpdates
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sl_console.log "Simulating a lost update", update
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return
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if @track_changes
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update.meta ?= {}
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update.meta.tc = @track_changes_id_seeds.inflight
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@socket.emit "applyOtUpdate", @doc_id, update, (error) =>
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return @_handleError(error) if error?
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state: "ok"
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id: @socket.socket.sessionid
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}
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@_doc = new ShareJs.Doc @connection, @doc_id,
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type: @type
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@_doc.setFlushDelay(SINGLE_USER_FLUSH_DELAY)
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@_doc.on "change", (args...) =>
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@trigger "change", args...
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@_doc.on "acknowledge", () =>
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@lastAcked = new Date() # note time of last ack from server for an op we sent
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@trigger "acknowledge"
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@_doc.on "remoteop", (args...) =>
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# As soon as we're working with a collaborator, start sending
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# ops as quickly as possible for low latency.
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@_doc.setFlushDelay(0)
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@trigger "remoteop", args...
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@_doc.on "flipped_pending_to_inflight", () =>
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@trigger "flipped_pending_to_inflight"
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@_doc.on "saved", () =>
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@trigger "saved"
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@_doc.on "error", (e) =>
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@_handleError(e)
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@_bindToDocChanges(@_doc)
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@processUpdateFromServer
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open: true
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v: version
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snapshot: snapshot
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submitOp: (args...) -> @_doc.submitOp(args...)
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processUpdateFromServer: (message) ->
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try
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@_doc._onMessage message
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catch error
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# Version mismatches are thrown as errors
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console.log error
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@_handleError(error)
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if message?.meta?.type == "external"
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@trigger "externalUpdate", message
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catchUp: (updates) ->
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for update, i in updates
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update.v = @_doc.version
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update.doc = @doc_id
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@processUpdateFromServer(update)
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getSnapshot: () -> @_doc.snapshot
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getVersion: () -> @_doc.version
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getType: () -> @type
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clearInflightAndPendingOps: () ->
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@_doc.inflightOp = null
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@_doc.inflightCallbacks = []
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@_doc.pendingOp = null
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@_doc.pendingCallbacks = []
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flushPendingOps: () ->
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# This will flush any ops that are pending.
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# If there is an inflight op it will do nothing.
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@_doc.flush()
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updateConnectionState: (state) ->
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sl_console.log "[updateConnectionState] Setting state to #{state}"
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@connection.state = state
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@connection.id = @socket.socket.sessionid
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@_doc.autoOpen = false
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@_doc._connectionStateChanged(state)
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@lastAcked = null # reset the last ack time when connection changes
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hasBufferedOps: () ->
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@_doc.inflightOp? or @_doc.pendingOp?
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getInflightOp: () -> @_doc.inflightOp
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getPendingOp: () -> @_doc.pendingOp
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getRecentAck: () ->
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# check if we have received an ack recently (within a factor of two of the single user flush delay)
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@lastAcked? and new Date() - @lastAcked < 2 * SINGLE_USER_FLUSH_DELAY
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getOpSize: (op) ->
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# compute size of an op from its components
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# (total number of characters inserted and deleted)
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size = 0
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for component in op or []
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if component?.i?
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size += component.i.length
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if component?.d?
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size += component.d.length
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return size
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attachToAce: (ace) -> @_doc.attach_ace(ace, false, window.maxDocLength)
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detachFromAce: () -> @_doc.detach_ace?()
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attachToCM: (cm) -> @_doc.attach_cm(cm, false)
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detachFromCM: () -> @_doc.detach_cm?()
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INFLIGHT_OP_TIMEOUT: 5000 # Retry sending ops after 5 seconds without an ack
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WAIT_FOR_CONNECTION_TIMEOUT: 500 # If we're waiting for the project to join, try again in 0.5 seconds
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_startInflightOpTimeout: (update) ->
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@_startFatalTimeoutTimer(update)
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retryOp = () =>
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# Only send the update again if inflightOp is still populated
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# This can be cleared when hard reloading the document in which
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# case we don't want to keep trying to send it.
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sl_console.log "[inflightOpTimeout] Trying op again"
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if @_doc.inflightOp?
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# When there is a socket.io disconnect, @_doc.inflightSubmittedIds
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# is updated with the socket.io client id of the current op in flight
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# (meta.source of the op).
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# @connection.id is the client id of the current socket.io session.
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# So we need both depending on whether the op was submitted before
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# one or more disconnects, or if it was submitted during the current session.
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update.dupIfSource = [@connection.id, @_doc.inflightSubmittedIds...]
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# We must be joined to a project for applyOtUpdate to work on the real-time
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# service, so don't send an op if we're not. Connection state is set to 'ok'
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# when we've joined the project
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if @connection.state != "ok"
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sl_console.log "[inflightOpTimeout] Not connected, retrying in 0.5s"
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timer = setTimeout retryOp, @WAIT_FOR_CONNECTION_TIMEOUT
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else
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sl_console.log "[inflightOpTimeout] Sending"
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@connection.send(update)
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timer = setTimeout retryOp, @INFLIGHT_OP_TIMEOUT
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@_doc.inflightCallbacks.push () =>
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@_clearFatalTimeoutTimer()
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clearTimeout timer
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FATAL_OP_TIMEOUT: 30000 # 30 seconds
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_startFatalTimeoutTimer: (update) ->
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# If an op doesn't get acked within FATAL_OP_TIMEOUT, something has
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# gone unrecoverably wrong (the op will have been retried multiple times)
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return if @_timeoutTimer?
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@_timeoutTimer = setTimeout () =>
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@_clearFatalTimeoutTimer()
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@trigger "op:timeout", update
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, @FATAL_OP_TIMEOUT
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_clearFatalTimeoutTimer: () ->
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return if !@_timeoutTimer?
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clearTimeout @_timeoutTimer
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@_timeoutTimer = null
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_handleError: (error, meta = {}) ->
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@trigger "error", error, meta
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_bindToDocChanges: (doc) ->
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submitOp = doc.submitOp
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doc.submitOp = (args...) =>
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@trigger "op:sent", args...
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doc.pendingCallbacks.push () =>
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@trigger "op:acknowledged", args...
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submitOp.apply(doc, args)
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flush = doc.flush
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doc.flush = (args...) =>
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@trigger "flush", doc.inflightOp, doc.pendingOp, doc.version
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flush.apply(doc, args)
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