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bf452bf306
The meta.source of an update is populated on the server side so we need to keep our local connection id up to date with it. When a duplicate op is submitted we must send all possible client ids that it could have been sent with.
148 lines
4.5 KiB
CoffeeScript
148 lines
4.5 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 = for line in docLines
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if line.text?
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@type = "json"
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line.text = decodeURIComponent(escape(line.text))
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else
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@type = "text"
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line = decodeURIComponent(escape(line))
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line
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if @type == "text"
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snapshot = docLines.join("\n")
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else if @type == "json"
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snapshot = { lines: docLines }
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else
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throw new Error("Unknown type: #{@type}")
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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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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.dropAcks
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console.log "Simulating a lost update", update
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return
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@socket.emit "applyOtUpdate", @doc_id, update
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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", () =>
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@trigger "change"
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@_doc.on "acknowledge", () =>
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@trigger "acknowledge"
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@_doc.on "remoteop", () =>
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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"
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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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@_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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@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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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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attachToAce: (ace) -> @_doc.attach_ace(ace, false, window.maxDocLength)
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detachFromAce: () -> @_doc.detach_ace?()
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INFLIGHT_OP_TIMEOUT: 5000
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_startInflightOpTimeout: (update) ->
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timer = setTimeout () =>
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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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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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@connection.send(update)
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# TODO: Trigger op:timeout only when some max retries have been hit
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# and we need to do a full reload.
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# @trigger "op:timeout", update
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, @INFLIGHT_OP_TIMEOUT
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@_doc.inflightCallbacks.push () =>
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clearTimeout timer
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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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