Crystal OBS-WebSocket object relational mapping and control interface initial commit.v5.0.1.20201028.alpha1

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+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
diff --git a/shard.yml b/shard.yml
new file mode 100644
index 0000000..083d950
--- /dev/null
+++ b/shard.yml
@@ -0,0 +1,11 @@
+name: obswebsocket
+version: 5.0.1.20221028.alpha1
+repository: "git://fairlystable.org/crystal-obs-websocket"
+
+authors:
+  - Joe Rayhawk
+
+license: AGPLv3
+
+description:
+  Object relational mapping to the Open Broadcast System Studio OBS-WebSocket plugin protocol.
diff --git a/src/obswebsocket.cr b/src/obswebsocket.cr
new file mode 100644
index 0000000..3978b47
--- /dev/null
+++ b/src/obswebsocket.cr
@@ -0,0 +1,923 @@
+require "json"
+require "pretty_print"
+require "http"
+require "uuid"
+
+struct Nil
+  def as_s?
+    self
+  end
+end
+
+module OBSWebSocket
+  extend self
+  def req( type : String, id : String, data : ( String | Nil | JSON::Any ) = nil )
+    request = JSON.build do |json|
+      json.object do
+        json.field "op", 6
+        json.field "d" do
+          json.object do
+            json.field "requestType", type
+            json.field "requestId", id
+            if data
+              json.field "requestData", data
+            end
+          end
+        end
+      end
+    end
+    return( request.to_s )
+  end
+
+  class SourceMissingException < Exception
+  end
+
+  class ResponseDataMissingException < Exception
+  end
+
+  class Server
+    @@reqchan = Channel( Tuple( ( Channel( JSON::Any ) | Nil ), String ) ).new
+    @scenecollection = OBSWebSocket::SceneCollection.new( @@reqchan )
+    @@inputs = OBSWebSocket::Inputs.new( @@reqchan )
+    @@scenes = OBSWebSocket::SceneList.new( @@reqchan, @@inputs )
+    @sources = OBSWebSocket::Sources.new( @@inputs, @@scenes )
+    @outputs = OBSWebSocket::Outputs.new( @@reqchan )
+    @video = OBSWebSocket::VideoSettings.new( @@reqchan )
+    @stats = OBSWebSocket::Stats.new( @@reqchan )
+    @negotiated = false
+    def reqchan
+      return @@reqchan
+    end
+    def scenecollection
+      return @scenecollection
+    end
+    def scenes
+      return @@scenes
+    end
+    def inputs
+      return @@inputs
+    end
+    def outputs
+      return @outputs
+    end
+    def sources
+      return @sources
+    end
+    def video
+      return @video
+    end
+    def stats
+      return @stats
+    end
+    def transition!
+      reschan = Channel( JSON::Any ).new
+      @@reqchan.send( { reschan, OBSWebSocket.req( "TriggerStudioModeTransition", UUID.random.to_s ) } )
+      return reschan.receive
+    end
+    # request channel, response channel
+    def send( json : String )
+      self.reqchan.send( { nil, json } )
+    end
+    def send( reschan : ( Channel( JSON::Any ) | Nil ), json : String )
+      self.reqchan.send( { reschan, json } )
+    end
+    def request( type : String, id : String, data : ( String | Nil | JSON::Any ) = nil )
+      request = JSON.build do |json|
+        json.object do
+          json.field "op", 6
+          json.field "d" do
+            json.object do
+              json.field "requestType", type
+              json.field "requestId", id
+              if data
+                json.field "requestData", data
+              end
+            end
+          end
+        end
+      end
+      self.reqchan.send( { nil, request.to_s } )
+    end
+    def request( reschan : ( Channel( JSON::Any ) | Nil ), type : String, id : String, data : ( String | Nil | JSON::Any ) = nil )
+      request = JSON.build do |json|
+        json.object do
+          json.field "op", 6
+          json.field "d" do
+            json.object do
+              json.field "requestType", type
+              json.field "requestId", id
+              if data
+                json.field "requestData", data
+              end
+            end
+          end
+        end
+      end
+      self.reqchan.send( { reschan, request.to_s } )
+    end
+    def initialize( uri : String )
+      spawn do
+        loop do
+          obs5_pubsub = HTTP::WebSocket.new( URI.parse( uri ), HTTP::Headers{"Cookie" => "SESSIONID=1235", "Sec-WebSocket-Protocol" => "obswebsocket.json"} )
+          openrequests = Hash( String, Channel( JSON::Any ) ).new
+          eventsubs = Array( Channel(JSON::Any) ).new
+          #metachan = Channel( Tuple( String, Channel( JSON::Any ) ) ).new
+          spawn do
+            queue = Array( Tuple( Channel( JSON::Any ) | Nil, String ) ).new
+            while msgtuple = @@reqchan.receive
+              if msgtuple[1] == "clear queue"
+                queue.each do | msg |
+                  reschan = msg[0]
+                  print( "SENT: " )
+                  json = JSON.parse(msg[1])
+                  pp json
+                  if reschan
+                    openrequests[ json["d"]["requestId"].as_s ] = reschan
+                  end
+                  obs5_pubsub.send( msg[1] )
+                end
+              elsif msgtuple[1] == "subscribe events"
+                reschan = msgtuple[0]
+                if reschan
+                  eventsubs.push(reschan)
+                end
+              elsif @negotiated
+                reschan = msgtuple[0]
+                print "SENT: "
+                json = JSON.parse( msgtuple[1] )
+                pp json
+                if reschan
+                  openrequests[ json["d"]["requestId"].as_s ] = reschan
+                end
+                obs5_pubsub.send( msgtuple[1] )
+              elsif JSON.parse( msgtuple[1] )["op"].as_i64 == 1
+                print "SENT: "
+                json = JSON.parse( msgtuple[1] )
+                pp json
+                obs5_pubsub.send( msgtuple[1] )
+              else
+                print "QUEUED: "
+                pp msgtuple[1]
+                queue.push( { msgtuple[0], msgtuple[1] } )
+              end
+            end
+          end
+          obs5_pubsub.on_message do | message |
+            json = JSON.parse( message )
+            print( "RECEIVED: ")
+            print( json.to_pretty_json )
+            print( "\n")
+            if json["error"]?
+              puts json["error"]
+              #ircipc.send( { "#" + settings["reqchan"], "| obs5: #{json["error"]}" } )
+              next
+            end
+            case json["op"].as_i64
+            when 0 # hello
+              json_text = %({"op":1,"d":{"rpcVersion":1,"eventSubscriptions":526335}})
+              self.send( json_text )
+            when 2 # identified
+                @negotiated = true
+                self.reqchan.send( { nil, "clear queue" } )
+            when 5 # event
+              eventsubs.each do | eventchan |
+                eventchan.send( json["d"] )
+              end
+              case json["d"]["eventType"].as_s
+              # Note: "spawn do" when more request callouts might happen
+              when "CurrentPreviewSceneChanged"
+                edata = json["d"]["eventData"]
+                @@scenes.previewcache( edata["sceneName"].as_s )
+              when "CurrentProgramSceneChanged"
+                edata = json["d"]["eventData"]
+                @@scenes.programcache( edata["sceneName"].as_s )
+              when "InputCreated"
+                edata = json["d"]["eventData"]
+                @@inputs[edata["inputName"].to_s] = OBSWebSocket::Input.new( @@reqchan, edata )
+              when "InputNameChanged"
+                edata = json["d"]["eventData"]
+                @@inputs.renamecache( edata["oldInputName"].as_s, edata["inputName"].as_s )
+              when "InputRemoved"
+                edata = json["d"]["eventData"]
+                @@inputs.deletecache( edata["inputName"].as_s )
+              when "SceneItemRemoved"
+                spawn do
+                  edata = json["d"]["eventData"]
+                  @@scenes[edata["sceneName"].to_s].deletecache( edata["sceneItemId"].as_i64, edata["sourceName"].as_s )
+                end
+              when "SceneItemEnableStateChanged"
+                spawn do
+                  edata = json["d"]["eventData"]
+                  @@scenes[edata["sceneName"].as_s][edata["sceneItemId"].as_i64].enabledcache( edata["sceneItemEnabled"].as_bool )
+                end
+              when "SceneItemTransformChanged"
+                spawn do
+                  edata = json["d"]["eventData"]
+                  scenes[edata["sceneName"].as_s][edata["sceneItemId"].as_i64].transform.cache( edata["sceneItemTransform"] )
+                end
+              when "SourceDestroyed"
+                # We always dynamically assemble sources from inputs and scenes, so this event is ignored.
+              when "SourceFilterEnableStateChanged"
+                edata = json["d"]["eventData"]
+                spawn do
+                  if ( source = @sources[edata["sourceName"].as_s]? )
+                      puts "SourceFilterEnableStateChanged: #{source.class}"
+                      source.filters[edata["filterName"].as_s].enabledcache( edata["filterEnabled"].as_bool )
+                  else
+                    raise SourceMissingException.new( "SourceFilterEnableStateChanged: missing source #{ edata["sourceName"].as_s}" )
+                  end
+                end
+              end
+            when 7 # response
+              if json["d"]["requestStatus"]["result"].as_bool == false
+                puts "ERROR: #{json["d"]["requestType"].as_s} #{json["d"]["requestStatus"]["code"].as_i64}: #{json["d"]["requestStatus"]["comment"].as_s}"
+              end
+              if openrequests[ json["d"]["requestId"].as_s ]?
+                channel = openrequests[ json["d"]["requestId"].as_s ]
+                channel.send( json["d"] )
+                channel.close
+                openrequests.delete( json["d"]["requestId"].as_s )
+              else
+                puts "PUBSUBREAD THREAD: no response channel known for requestId: #{ json["d"]["requestId"].as_s }"
+              end
+            end
+          end
+          obs5_pubsub.run
+          sleep 10
+          next
+        end
+      end
+    end
+  end
+
+  class Outputs
+    @outputs = Hash( String, OBSWebSocket::Output ).new
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ) )
+    end
+    def populate
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "GetOutputList", UUID.random.to_s ) } )
+      d = reschan.receive
+      if ( rdata = d["responseData"]? )
+        print "OUTPUTS THREAD: "
+        pp rdata
+        rdata["outputs"].as_a.each do | output |
+          @outputs[output["outputName"].as_s] = OBSWebSocket::Output.new( @reqchan, output )
+        end
+      else
+        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
+      end
+    end
+    def []( key : String )
+      @outputs[key]? || populate
+      @outputs[key]
+    end
+    def to_h
+      @outputs.empty? && populate
+      @outputs
+    end
+  end
+
+  class Output
+    getter status : OBSWebSocket::OutputStatus
+    getter flags : Hash( String, Bool )
+    getter state : Hash( String, String | Bool | Int64 | Float64 | Hash( String, Bool ) )
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), json : JSON::Any )
+      @flags = Hash( String, Bool ).from_json(json["outputFlags"].to_json)
+      @status = OBSWebSocket::OutputStatus.new( @reqchan, json["outputName"].as_s )
+      @state = Hash(String, String | Bool | Int64 | Float64 | Hash( String, Bool ) ).from_json(json.to_json)
+    end
+  end
+
+  class OutputStatus
+    @age = Int64.new( 0 )
+    @status = Hash(String, String | Bool | Int64 | Float64 ).new
+    getter name : String
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @name : String )
+    end
+    def populate
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "GetOutputStatus", UUID.random.to_s, JSON.parse( { "outputName" => @name }.to_json ) ) } )
+      d = reschan.receive
+      if ( rdata = d["responseData"]? )
+        @age = Time.utc.to_unix
+        @status = Hash(String, String | Bool | Int64 | Float64 ).from_json(rdata.to_json)
+      else
+        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
+      end
+    end
+    def []( key : String )
+      ( @age < ( Time.utc.to_unix - 10 ) ) && populate
+      @status[key]? || populate
+      @status[key]
+    end
+    def to_h : Hash(String, String | Bool | Int64 | Float64 )
+      ( @age < ( Time.utc.to_unix - 10 ) ) && populate
+      @status.empty? && populate
+      @status
+    end
+  end
+
+  class VideoSettings
+    @settings = Hash(String, String | Bool | Int64 | Float64 ).new
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ) )
+    end
+    def populate
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "GetVideoSettings", UUID.random.to_s ) } )
+      d = reschan.receive
+      if ( rdata = d["responseData"]? )
+        @settings = Hash(String, String | Bool | Int64 | Float64 ).from_json(rdata.to_json)
+      else
+        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
+      end
+    end
+    def settings
+      @settings.empty? && populate
+      @settings
+    end
+    def []( key : String )
+      @settings[key]? || populate
+      @settings[key]
+    end
+    def to_h
+      @settings.empty? && populate
+      @settings
+    end
+  end
+
+  class Stats
+    @stats = Hash(String, String | Bool | Int64 | Float64 ).new
+    @age = Int64.new( 0 )
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ) )
+    end
+    def populate
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "GetStats", UUID.random.to_s ) } )
+      d = reschan.receive
+      if ( rdata = d["responseData"]? )
+        @stats = Hash(String, String | Bool | Int64 | Float64 ).from_json(rdata.to_json)
+        @age = Time.utc.to_unix
+      else
+        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
+      end
+    end
+    def []( key : String )
+      ( @age < ( Time.utc.to_unix - 10 ) ) && populate
+      @stats[key]? || populate
+      @stats[key]
+    end
+    def to_h : Hash(String, String | Bool | Int64 | Float64 )
+      @stats.empty? && populate
+      @stats
+    end
+  end
+
+  class SceneCollection # Note: distinct from SceneList
+    @current = String.new
+    @list = Hash( String, OBSWebSocket::SceneList ).new
+    @reqchan = Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ).new
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ) )
+    end
+    def populate
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "GetSceneCollectionList", UUID.random.to_s ) } )
+      d = reschan.receive
+      if ( rdata = d["responseData"]? )
+        @current = rdata["currentSceneCollectionName"].as_s
+        rdata["sceneCollections"].as_a.each{ | scenecollection |
+          @list[scenecollection.as_s] = OBSWebSocket::SceneList.new( @reqchan )
+        }
+      else
+        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
+      end
+      return true
+    end
+    def current()
+       @current.empty? && populate()
+       return @current
+    end
+    def []( scenelist : String )
+      if list[scenelist]?
+        return list[scenelist]
+      else
+        self.populate
+      end
+    end
+  end
+
+  class SceneList # Note: distinct from SceneCollection
+    @scenes_by_index = Array(String).new
+    @scenes = Hash(String, OBSWebSocket::Scene).new
+    @program = String.new
+    @preview = String.new
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @inputs : OBSWebSocket::Inputs )
+    end
+    def populate
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "GetSceneList", UUID.random.to_s ) } )
+      d = reschan.receive
+      if ( rdata = d["responseData"]? )
+        @program = rdata["currentProgramSceneName"].as_s
+        @preview = rdata["currentPreviewSceneName"].as_s
+        rdata["scenes"].as_a.each_with_index{ | scene, i |
+          name = scene["sceneName"].as_s
+          @scenes_by_index.push(name)
+          @scenes[name] = OBSWebSocket::Scene.new( @reqchan, name, self )
+        }
+      else
+        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
+      end
+      return true
+    end
+    def invalidate
+      puts "SCENELIST THREAD: scenes invalidated"
+      @scenes_by_index = Array(String).new
+      @scenes = Hash(String, OBSWebSocket::Scene).new
+      @program = String.new
+      @preview = String.new
+    end
+    def programcache( v : String )
+      @program = v
+    end
+    def program
+      @program.empty? && populate()
+      @scenes[@program]
+    end
+    def previewcache( v : String )
+      @preview = v
+    end
+    def preview
+      @preview.empty? && populate()
+      @scenes[@preview]
+    end
+    def current
+      @program.empty? && populate
+      @scenes[@program]
+    end
+    def []( index : Int ) : OBSWebSocket::Scene
+      @scenes_by_index[index]? || populate
+      @scenes[@scenes_by_index[index]]? || populate
+      @scenes[@scenes_by_index[index]]
+    end
+    def []( index : String ) : OBSWebSocket::Scene
+      @scenes[index]? || populate
+      @scenes[index]
+    end
+    def []?( index : String ) : OBSWebSocket::Scene | Nil
+      @scenes[index]? || populate
+      @scenes[index]?
+    end
+    def to_h : Hash( String, OBSWebSocket::Scene )
+      @scenes.empty? && populate
+      return @scenes
+    end
+  end
+
+  class Scene
+    @items_by_id    = Hash( Int64, OBSWebSocket::SceneItem ).new
+    @items_by_name  = Hash( String, Int64 ).new
+    @items_by_index = Array( Int64 ).new
+    @subscenes      = Array( OBSWebSocket::Scene ).new
+    getter filters  : OBSWebSocket::SourceFilters
+    getter name     : String
+    getter parent   : OBSWebSocket::SceneList # needed for reverse metasceneitem lookup
+    @age            = Int64.new( 0 )
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @name : String, @parent : OBSWebSocket::SceneList )
+      @filters  = OBSWebSocket::SourceFilters.new( @reqchan, @name )
+    end
+    def populate
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "GetSceneItemList", UUID.random.to_s, JSON.parse( { "sceneName" => @name }.to_json ) ) } )
+      d = reschan.receive
+      if ( rdata = d["responseData"]? )
+        # handle "sourceType": "OBS_SOURCE_TYPE_SCENE"
+        rdata["sceneItems"].as_a.each_with_index{ | item, i |
+          sname = item["sourceName"].as_s
+          siid   = item["sceneItemId"].as_i64
+          @items_by_id[siid] = OBSWebSocket::SceneItem.new( @reqchan, @name, item )
+          @items_by_index.push( siid )
+          @items_by_name[sname] = siid
+          if item["sourceType"].as_s == "OBS_SOURCE_TYPE_SCENE"
+            @subscenes.push( @parent[sname] )
+          end
+        }
+      @age = Time.utc.to_unix
+      else
+        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
+      end
+      return true
+    end
+    # Sources may be present a scene via other scenes.
+    # We can still look these up by source name.
+    # FIXME: does not recurse
+    # Note: OBS refuses to create a referential loop
+    # FIXME: only returns one SceneItem
+    def metascene : Hash( String, OBSWebSocket::SceneItem )
+      @subscenes.empty? && populate
+      metascene = Hash( String, OBSWebSocket::SceneItem ).new
+      @subscenes.each do | subscene |
+        metascene.merge!(subscene.to_h)
+      end
+      @items_by_id.values.each do | sitem |
+        metascene[ sitem.name ] = sitem
+      end
+      return metascene
+    end
+    # less requests generated with this method
+    # but Nil union is more annoying
+    # FIXME: See metascene()
+    def metasceneitem?( name : String ) : OBSWebSocket::SceneItem | Nil
+      result = nil
+      if self[name]?
+        result = self[name]
+      else
+        @subscenes.each do | scene |
+          if scene[name]?
+            result = scene[name]
+            break
+          end
+        end
+      end
+      return result
+    end
+    def []?( name : String ) : OBSWebSocket::SceneItem | Nil
+      ( @items_by_name[name]? || ( @age > 0 ) ) || populate
+      if @items_by_name[name]?
+        ( @items_by_id[ @items_by_name[name] ]? || ( @age > 0 ) ) || populate
+        return @items_by_id[ @items_by_name[name] ]
+      else
+        return nil
+      end
+    end
+    def []( name : String ) : OBSWebSocket::SceneItem
+      @items_by_name[name]? || populate
+      @items_by_id[ @items_by_name[name] ]? || populate
+      return @items_by_id[ @items_by_name[name] ]
+    end
+    def []( id : Int64 ) : OBSWebSocket::SceneItem
+      @items_by_id[id]? || populate
+      return @items_by_id[id]
+    end
+    def by_index( index : Int64 )
+      @items_by_index[index]? || populate
+      @items_by_id[ @items_by_index[index] ]? || populate
+      return @items_by_id[ @items_by_index[index] ]
+    end
+    def to_h : Hash( String, OBSWebSocket::SceneItem )
+      @items_by_id.empty? && populate
+      hash = Hash( String, OBSWebSocket::SceneItem ).new
+      @items_by_name.each do | key, value |
+        hash[key] = @items_by_id[value]
+      end
+      return hash
+    end
+    def current!
+      program!
+    end
+    def program!
+      @reqchan.send( { nil, OBSWebSocket.req( "SetCurrentProgramScene", UUID.random.to_s, JSON.parse( { "sceneName" => @name }.to_json ) ) } )
+    end
+    def preview!
+      @reqchan.send( { nil, OBSWebSocket.req( "SetCurrentPreviewScene", UUID.random.to_s, JSON.parse( { "sceneName" => @name }.to_json ) ) } )
+    end
+    def createinput( iname : String, kind : String, settings : OBSWebSocket::InputSettings | Hash( String, String | Bool | Int64 | Float64 ) | Nil = nil, enabled : Bool = true )
+      reqdata = ( Hash( String, String | Bool | Int64 | Float64 | Hash( String, String | Bool | Int64 | Float64 ) ) ).new
+      reqdata["sceneName"] = @name
+      reqdata["inputName"] = iname
+      reqdata["inputKind"] = kind
+      if settings
+        reqdata["inputSettings"] = settings.to_h
+      end
+      unless enabled
+        reqdata["sceneItemEnabled"] = false
+      end
+
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "CreateInput", UUID.random.to_s, JSON.parse(reqdata.to_json) ) } )
+      d = reschan.receive
+      # maybe block until the event comes in?
+      # will have to depend on the EventSubscription state
+      if d["requestStatus"]["result"].as_bool # success?
+        # "responseData": { "sceneItemId": 219 }
+        # Is this ever useful? It's a lot more requests than to just redo the entire GetSceneItemList
+        #siid = d["responseData"]["sceneItemId"].as_i64
+        parent.@inputs.deletecache
+        self.deletecache
+      end
+
+    end
+    def deletecache( )
+
+      @items_by_id    = Hash( Int64, OBSWebSocket::SceneItem ).new
+      @items_by_name  = Hash( String, Int64 ).new
+      @items_by_index = Array( Int64 ).new
+      @subscenes      = Array( OBSWebSocket::Scene ).new
+    end
+    def deletecache( siid : Int64, siname : String )
+      @items_by_id.delete( siid )
+      @items_by_name.delete( siname )
+      @items_by_index.delete( siid )
+    end
+  end
+
+  class SceneItem
+    getter id        : Int64
+    getter name      : String
+    getter kind      : ( String | Nil )
+    getter type      : String
+    getter scenename : String
+    getter enabled   : Bool
+    getter blendmode : ( String | Nil )
+    getter locked    : Bool
+    getter transform : OBSWebSocket::SceneItemTransform
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @scenename : String, json : JSON::Any )
+      @id      = json["sceneItemId"].as_i64
+      @name    = json["sourceName"].as_s
+      @kind    = json["inputKind"]?.as_s?
+      @type    = json["sourceType"].as_s
+      @locked  = json["sceneItemLocked"].as_bool
+      @enabled = json["sceneItemEnabled"].as_bool
+      @blendmode = json["sceneItemBlendmode"]?.as_s?
+      @transform = OBSWebSocket::SceneItemTransform.new( @reqchan, json["sceneItemTransform"], @name, @id )
+    end
+    def enabledcache( v : Bool )
+      @enabled = v
+    end
+    def enabled
+      @enabled
+    end
+    def toggle!
+      if @enabled
+        disable!
+      else
+        enable!
+      end
+    end
+    def enable!
+      @reqchan.send( { nil, OBSWebSocket.req( "SetSceneItemEnabled", UUID.random.to_s, JSON.parse( { "sceneName" => @scenename, "sceneItemId" => @id, "sceneItemEnabled" => true }.to_json ) ) } )
+    end
+    def disable!
+      @reqchan.send( { nil, OBSWebSocket.req( "SetSceneItemEnabled", UUID.random.to_s, JSON.parse( { "sceneName" => @scenename, "sceneItemId" => @id, "sceneItemEnabled" => false }.to_json ) ) } )
+    end
+    def transform( newtransform : OBSWebSocket::SceneItemTransform | Hash( String, String | Bool | Int64 | Float64 ) )
+      reqdata = ( Hash( String, String | Bool | Int64 | Float64 | Hash( String, String | Bool | Int64 | Float64 ) ) ).new
+      reqdata["sceneItemId"] = @id.to_i64
+      reqdata["sceneName"] = @scenename
+      reqdata["sceneItemTransform"] = Hash( String, String | Bool | Int64 | Float64).new.merge( newtransform.to_h )
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "SetSceneItemTransform", UUID.random.to_s, JSON.parse(reqdata.to_json) ) } )
+      d = reschan.receive
+    end
+  end
+
+  class SceneItemTransform
+    @sceneitemtransform = Hash(String, String | Bool | Int64 | Float64 ).new
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), json : JSON::Any, @sceneitemname : String, @sceneitemid : Int64 )
+      @sceneitemtransform = Hash(String, String | Bool | Int64 | Float64 ).from_json(json.to_json)
+    end
+    def populate
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "GetSceneItemTransform", UUID.random.to_s, JSON.parse( { "sceneName" => @sceneitemname, "sceneItemId" => @sceneitemid }.to_json ) ) } )
+      d = reschan.receive
+      if ( rdata = d["responseData"]? )
+        @sceneitemtransform = Hash(String, String | Bool | Int64 | Float64 ).from_json(rdata["sceneItemTransform"].to_json)
+      else
+        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
+      end
+    end
+    def []( key : String )
+      @sceneitemtransform[key]? || populate
+      @sceneitemtransform[key]
+    end
+    def to_h
+      @sceneitemtransform.empty? && populate
+      @sceneitemtransform
+    end
+    def cache( newtransform = JSON::Any | Hash(String, String | Bool | Int64 | Float64 ) )
+        @sceneitemtransform = Hash(String, String | Bool | Int64 | Float64 ).from_json(newtransform.to_json)
+    end
+  end
+
+  class Sources
+    getter scenes : OBSWebSocket::SceneList
+    getter inputs : OBSWebSocket::Inputs
+    def initialize( @inputs : OBSWebSocket::Inputs, @scenes : OBSWebSocket::SceneList )
+    end
+    def []?( index : String ) : OBSWebSocket::Scene | OBSWebSocket::Input | Nil
+      if @inputs[index]?
+        return @inputs[index]
+      elsif @scenes[index]?
+        return @scenes[index]
+      else
+        return nil
+      end
+    end
+    def to_h() : Hash( String, OBSWebSocket::Scene | OBSWebSocket::Input )
+      return @inputs.to_h.merge( @scenes.to_h )
+    end
+  end
+
+  class Inputs
+    @inputs = Hash( String, OBSWebSocket::Input ).new
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ) )
+    end
+    def populate
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "GetInputList", UUID.random.to_s) } )
+      d = reschan.receive
+      if ( rdata = d["responseData"]? )
+        rdata["inputs"].as_a.each{ | input |
+          @inputs[input["inputName"].as_s] = OBSWebSocket::Input.new( @reqchan, input )
+        }
+      else
+        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
+      end
+    end
+    def []?( index : String ) : OBSWebSocket::Input | Nil
+      @inputs[index]? || populate
+      return @inputs[index]?
+    end
+    def []( index : String )
+      @inputs[index]? || populate
+      return @inputs[index]
+    end
+    def []=( index : String, input = OBSWebSocket::Input )
+      @inputs[index] = input
+    end
+    def to_h : Hash( String, OBSWebSocket::Input )
+      @inputs.empty? && populate
+      return @inputs
+    end
+    def renamecache( old : String, new : String )
+      @inputs[new] = @inputs[old]
+      @inputs.delete( old )
+      @inputs[new].namecache( new )
+    end
+    def deletecache()
+      @inputs = Hash( String, OBSWebSocket::Input ).new
+    end
+    def deletecache( input : String )
+      @inputs.delete( input )
+    end
+  end
+
+  class Input
+    getter kind : String
+    getter name : String
+    getter settings : OBSWebSocket::InputSettings
+    getter filters  : OBSWebSocket::SourceFilters
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), json : JSON::Any )
+      @kind = json["inputKind"].as_s
+      @name = json["inputName"].as_s
+      @settings = OBSWebSocket::InputSettings.new( @reqchan, @name )
+      @filters  = OBSWebSocket::SourceFilters.new( @reqchan, @name )
+    end
+    def delete!( )
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "RemoveInput", UUID.random.to_s, JSON.parse({ "inputName" => @name }.to_json) ) } )
+      d = reschan.receive
+    end
+    def namecache( name : String )
+      @name = name
+      @settings.namecache( name )
+
+      @filters.to_h.values.each do | value |
+        value.sourcenamecache( name )
+      end
+    end
+  end
+
+  class InputSettings
+    @inputsettings = Hash(String, String | Bool | Int64 | Float64 ).new
+    @inputkind = String.new
+    getter name : String
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @name : String )
+    end
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @name : String, @inputkind : String, @inputsettings : Hash( String, String | Bool | Int64 | Float64 ) )
+    end
+    def populate
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "GetInputSettings", UUID.random.to_s, JSON.parse( { "inputName" => @name }.to_json ) ) } )
+      d = reschan.receive
+      if ( rdata = d["responseData"]? )
+        @inputsettings = Hash(String, String | Bool | Int64 | Float64 ).from_json(rdata["inputSettings"].to_json)
+        @inputkind = rdata["inputKind"].as_s
+      else
+        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
+      end
+    end
+    def kind
+      @inputkind.empty? && populate
+      @inputkind
+    end
+    def []( key : String )
+      @inputsettings[key]? || populate
+      @inputsettings[key]
+    end
+    def to_h
+      @inputsettings.empty? && populate
+      @inputsettings
+    end
+    def namecache( name : String)
+      @name = name
+    end
+  end
+
+  class SourceFilters # Note: a property of both OBSWebSocket::Input and OBSWebSocket::Scene
+    @filters_by_name = Hash( String, OBSWebSocket::SourceFilter ).new
+    @filters_by_index = Array( String ).new
+    getter sourcename : String
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @sourcename : String )
+    end
+    def populate
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "GetSourceFilterList", UUID.random.to_s, JSON.parse( { "sourceName" => @sourcename }.to_json ) ) } )
+      d = reschan.receive
+      if ( rdata = d["responseData"]? )
+        rdata["filters"].as_a.each do | filter |
+          name = filter["filterName"].as_s
+          @filters_by_index.push( name )
+          @filters_by_name[name] = OBSWebSocket::SourceFilter.new( @reqchan, @sourcename, filter )
+        end
+      else
+        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
+      end
+    end
+    def []( index : Int64 )
+      @filters_by_index[index]? || populate
+      @filters_by_name[@filters_by_index[index]]? || populate
+      @filters_by_name[@filters_by_index[index]]
+    end
+    def []?( key : String ) : OBSWebSocket::SourceFilter | Nil
+      @filters_by_name[key]? || populate
+      @filters_by_name[key]?
+    end
+    def []( key : String )
+      @filters_by_name[key]? || populate
+      @filters_by_name[key]
+    end
+    def to_h
+      @filters_by_name.empty? && populate
+      @filters_by_name
+    end
+  end
+
+  class SourceFilter
+    getter name       : String
+    getter kind       : String
+    getter enabled    : Bool
+    getter settings   : OBSWebSocket::SourceFilterSettings
+    getter sourcename : String
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @sourcename, json : JSON::Any )
+      @kind = json["filterKind"].as_s
+      @name = json["filterName"].as_s
+      @enabled = json["filterEnabled"].as_bool
+      @settings = OBSWebSocket::SourceFilterSettings.new( @reqchan, @name, json["filterSettings"] )
+    end
+    def toggle!
+      if @enabled
+        disable!
+      else
+        enable!
+      end
+    end
+    def enable!
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "SetSourceFilterEnabled", UUID.random.to_s, JSON.parse( { "sourceName" => @sourcename, "filterName" => @name, "filterEnabled" => true }.to_json ) ) } )
+      d = reschan.receive
+      return d["requestStatus"]["result"].as_bool
+    end
+    def disable!
+      reschan = Channel( JSON::Any ).new
+      @reqchan.send( { reschan, OBSWebSocket.req( "SetSourceFilterEnabled", UUID.random.to_s, JSON.parse( { "sourceName" => @sourcename, "filterName" => @name, "filterEnabled" => false }.to_json ) ) } )
+      d = reschan.receive
+      return d["requestStatus"]["result"].as_bool
+    end
+    def enabledcache( bool : Bool )
+      @enabled = bool
+    end
+    def sourcenamecache( name : String )
+      @sourcename = name
+    end
+  end
+
+  class SourceFilterSettings
+    getter settings : Hash(String, String | Bool | Int64 | Float64 )
+    getter sourcename : String
+    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @sourcename, json : JSON::Any )
+      @settings = Hash(String, String | Bool | Int64 | Float64 ).from_json(json.to_json)
+    end
+    # do we need to populate() this somehow?
+    # SetSourceFilterSettings is available, but
+    # GetSourceFilterSettings is not. Must use
+    # GetSourceFilters instead.
+    def []( key : String )
+      @settings[key]
+    end
+    def to_h
+      @settings
+    end
+
+  end
+end