Support token system in Qml app to reduce polling

Main window keep track centrally of all valid tokens, a Timer coupled
  with it's own instance of LibresapiLocalClient refresh periodically
  valid tokens, registerToken and isTokenValid are offered to child
  components to operate without polling
Main window coreStateCheckTimer is stopped after login

retroshare-qml-app/src/qml/main.qml

@@ -28,6 +28,33 @@ ApplicationWindow
 	width: 400
 	height: 400
 
+	property var tokens: ({})
+	function registerToken(token, callback)
+	{
+		if (Array.isArray(tokens[token])) tokens[token].push(callback)
+		else tokens[token] = [callback]
+	}
+	function tokenExpire(token)
+	{
+		if(Array.isArray(tokens[token]))
+		{
+			var arrLen = tokens[token].length
+			for(var i=0; i<arrLen; ++i)
+			{
+				var tokCallback = tokens[token][i]
+				if (typeof tokCallback == 'function')
+				{
+					console.log("event token", token, tokCallback)
+					tokCallback()
+				}
+			}
+		}
+
+		delete tokens[token]
+	}
+	function isTokenValid(token) { return Array.isArray(tokens[token]) }
+
+
 	header: ToolBar
 	{
 		id: toolBar
@@ -74,15 +101,14 @@ ApplicationWindow
 				{
 					text: qsTr("Trusted Nodes")
 					//iconSource: "qrc:/qml/icons/document-share.png"
-					onTriggered:
-						stackView.push("qrc:/qml/TrustedNodesView.qml")
+					onTriggered: stackView.push("qrc:/qml/TrustedNodesView.qml")
 				}
 				MenuItem
 				{
 					text: qsTr("Search Contacts")
 					onTriggered:
-						stackView.push(
-							"qrc:/qml/Contacts.qml", {'searching': true} )
+						stackView.push("qrc:/qml/Contacts.qml",
+									   {'searching': true} )
 				}
 				MenuItem
 				{
@@ -104,37 +130,6 @@ ApplicationWindow
 				event.accepted = true;
 			}
 
-		function checkCoreStatus()
-		{
-			function runStateCallback(par)
-			{
-				var jsonReponse = JSON.parse(par.response)
-				var runState = jsonReponse.data.runstate
-				if(typeof(runState) === 'string') stackView.state = runState
-				else
-				{
-					stackView.state = "core_down"
-					console.log("runStateCallback(...) core is down")
-				}
-			}
-			var ret = rsApi.request("/control/runstate/", "", runStateCallback)
-			if ( ret < 1 )
-			{
-				console.log("checkCoreStatus() core is down")
-				stackView.state = "core_down"
-			}
-		}
-
-		Timer
-		{
-			id: refreshTimer
-			interval: 800
-			repeat: true
-			triggeredOnStart: true
-			onTriggered: if(stackView.visible) stackView.checkCoreStatus()
-			Component.onCompleted: start()
-		}
-
 		state: "core_down"
 		states: [
 			State
@@ -164,7 +159,8 @@ ApplicationWindow
 				{
 					script:
 					{
-						console.log("StateChangeScript waiting_account_select")
+						console.log("StateChangeScript running_ok")
+						coreStateCheckTimer.stop()
 						stackView.clear()
 						stackView.push("qrc:/qml/Contacts.qml")
 					}
@@ -179,11 +175,79 @@ ApplicationWindow
 
 		initialItem: Rectangle
 		{
-			anchors.fill: parent
 			color: "green"
-			border.color: "black"
+			Text
+			{
+				text: "Connecting to core..."
+				anchors.centerIn: parent
+			}
+		}
+	}
 
-			Text { text: "Connecting to core..." }
+	LibresapiLocalClient
+	{
+		id: refreshTokensApi
+
+		onResponseReceived:
+		{
+			var jsonData = JSON.parse(msg).data
+			var arrayLength = jsonData.length;
+			for (var i = 0; i < arrayLength; i++)
+				mainWindow.tokenExpire(jsonData[i])
+		}
+
+		Component.onCompleted:
+		{
+			if(QT_DEBUG) debug = false
+
+			openConnection(apiSocketPath)
+			refreshTokensTimer.start()
+		}
+
+		function refreshTokens()
+		{
+			var ret = request("/statetokenservice/*",
+							  '['+Object.keys(mainWindow.tokens)+']')
+			if(ret < 1) stackView.state = "core_down"
+		}
+	}
+
+	Timer
+	{
+		id: refreshTokensTimer
+		interval: 1500
+		repeat: true
+		triggeredOnStart: true
+		onTriggered: refreshTokensApi.refreshTokens()
+	}
+
+	Timer
+	{
+		id: coreStateCheckTimer
+		interval: 1000
+		repeat: true
+		triggeredOnStart: true
+		onTriggered:
+		{
+			var ret = rsApi.request("/control/runstate/", "", runStateCallback)
+			if ( ret < 1 )
+			{
+				console.log("checkCoreStatus() core is down")
+				stackView.state = "core_down"
+			}
+		}
+		Component.onCompleted: start()
+
+		function runStateCallback(par)
+		{
+			var jsonReponse = JSON.parse(par.response)
+			var runState = jsonReponse.data.runstate
+			if(typeof(runState) === 'string') stackView.state = runState
+			else
+			{
+				stackView.state = "core_down"
+				console.log("runStateCallback(...) core is down")
+			}
 		}
 	}
 }