Prevent slowdown on firefox when deleting lots of shape messages

By creating a new collection called WhiteboardCleanStatus which
is used to alert the clients that the server is cleaning shapes.

When shapes are being cleaned they are not drawn and so things don't slow down on firefox or chrome

bigbluebutton-html5/app/client/views/whiteboard/slide.coffee

@@ -26,6 +26,9 @@ Template.slide.rendered = ->
   wpm.scale(adjustedDimensions.width, adjustedDimensions.height)
 
 @manuallyDisplayShapes = ->
+
+  return if Meteor.WhiteboardCleanStatus.findOne({in_progress: true})?
+
   currentSlide = getCurrentSlideDoc()
   wpm = @whiteboardPaperModel
   shapes = Meteor.Shapes.find({whiteboardId: currentSlide?.slide?.id}).fetch()

bigbluebutton-html5/app/collections/collections.coffee

@@ -4,3 +4,5 @@ Meteor.Meetings = new Meteor.Collection("meetings")
 Meteor.Presentations = new Meteor.Collection("presentations")
 Meteor.Shapes = new Meteor.Collection("shapes")
 Meteor.Slides = new Meteor.Collection("slides")
+
+Meteor.WhiteboardCleanStatus = new Meteor.Collection("whiteboard-clean-status")

bigbluebutton-html5/app/lib/router.coffee

@@ -55,6 +55,7 @@
             Meteor.subscribe 'meetings', meetingId, onReady: =>
               Meteor.subscribe 'presentations', meetingId, onReady: =>
                 Meteor.subscribe 'users', meetingId, userId, authToken, onError: onErrorFunction, onReady: =>
+                  Meteor.subscribe 'whiteboard-clean-status', meetingId, onReady: =>
                     # done subscribing
                     onLoadComplete()
 

bigbluebutton-html5/app/server/collection_methods/shapes.coffee

@@ -67,15 +67,13 @@
 @removeAllShapesFromSlide = (meetingId, whiteboardId) ->
   Meteor.log.info "removeAllShapesFromSlide__" + whiteboardId
   if meetingId? and whiteboardId? and Meteor.Shapes.find({meetingId: meetingId, whiteboardId: whiteboardId})?
-    shapesOnSlide = Meteor.Shapes.find({meetingId: meetingId, whiteboardId: whiteboardId}).fetch()
-    Meteor.log.info "number of shapes:" + shapesOnSlide.length
-    for s in shapesOnSlide
-      Meteor.log.info "shape=" + s.shape.id
-      id = Meteor.Shapes.findOne({meetingId: meetingId, whiteboardId: whiteboardId, "shape.id": s.shape.id})
-      if id?
-        Meteor.Shapes.remove(id._id)
-        Meteor.log.info "----removed shape[" + s.shape.id + "] from " + whiteboardId
-        Meteor.log.info "remaining shapes on the slide:" + Meteor.Shapes.find({meetingId: meetingId, whiteboardId: whiteboardId}).fetch().length
+    Meteor.Shapes.remove {meetingId: meetingId, whiteboardId: whiteboardId}, ->
+      Meteor.log.info "clearing all shapes from slide"
+
+      # After shapes are cleared, wait 1 second and set cleaning off
+      Meteor.setTimeout ->
+        Meteor.WhiteboardCleanStatus.update({meetingId: meetingId}, {$set: {in_progress: false}})
+      , 1000
 
 @removeShapeFromSlide = (meetingId, whiteboardId, shapeId) ->
   shapeToRemove = Meteor.Shapes.findOne({meetingId: meetingId, whiteboardId: whiteboardId, "shape.id": shapeId})
@@ -88,9 +86,13 @@
 # called on server start and meeting end
 @clearShapesCollection = (meetingId) ->
   if meetingId?
-    Meteor.Shapes.remove({meetingId: meetingId}, Meteor.log.info "cleared Shapes Collection (meetingId: #{meetingId}!")
+    Meteor.Shapes.remove {}, ->
+      Meteor.log.info "cleared Shapes Collection (meetingId: #{meetingId}!"
+      Meteor.WhiteboardCleanStatus.update({meetingId: meetingId}, {$set: {in_progress: false}})
   else
-    Meteor.Shapes.remove({}, Meteor.log.info "cleared Shapes Collection (all meetings)!")
+    Meteor.Shapes.remove {}, ->
+      Meteor.log.info "cleared Shapes Collection (all meetings)!"
+      Meteor.WhiteboardCleanStatus.update({meetingId: meetingId}, {$set: {in_progress: false}})
 
 # --------------------------------------------------------------------------------------------
 # end Private methods on server

bigbluebutton-html5/app/server/publish.coffee

@@ -70,3 +70,7 @@ Meteor.publish 'meetings', (meetingId) ->
 Meteor.publish 'presentations', (meetingId) ->
   Meteor.log.info "publishing presentations for #{meetingId}"
   Meteor.Presentations.find({meetingId: meetingId})
+
+Meteor.publish 'whiteboard-clean-status', (meetingId) ->
+  Meteor.log.info "whiteboard clean status #{meetingId}"
+  Meteor.WhiteboardCleanStatus.find({meetingId: meetingId})

bigbluebutton-html5/app/server/redispubsub.coffee

@@ -219,6 +219,11 @@ class Meteor.RedisPubSub
         return
 
       if message.header.name is "get_whiteboard_shapes_reply" and message.payload.requester_id is "nodeJSapp"
+
+        # Create a whiteboard clean status or find one for the current meeting
+        if not Meteor.WhiteboardCleanStatus.findOne({meetingId: meetingId})?
+            Meteor.WhiteboardCleanStatus.insert({meetingId: meetingId, in_progress: false})
+
         for shape in message.payload.shapes
           whiteboardId = shape.wb_id
           addShapeToCollection meetingId, whiteboardId, shape
@@ -238,6 +243,7 @@ class Meteor.RedisPubSub
 
       if message.header.name is "whiteboard_cleared_message"
         whiteboardId = message.payload.whiteboard_id
+        Meteor.WhiteboardCleanStatus.update({meetingId: meetingId}, {$set: {'in_progress': true}})
         removeAllShapesFromSlide meetingId, whiteboardId
         return
 

bigbluebutton-html5/app/server/server.coffee

@@ -2,6 +2,7 @@ Meteor.startup ->
   Meteor.log.info "server start"
 
   #remove all data
+  Meteor.WhiteboardCleanStatus.remove({})
   clearUsersCollection()
   clearChatCollection()
   clearMeetingsCollection()