QmlDesigner: Add PuppetAlive command

The puppet can be dead but we don't now. Now the puppet is sending a alive
signal. If the signal is not arriving anymore we restart the puppets.

Task-number: QTCREATORBUG-12434
Change-Id: I90edab6a45f95950fd764adcb125068659d5354b
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

share/qtcreator/qml/qmlpuppet/instances/nodeinstanceclientproxy.cpp

@@ -70,6 +70,7 @@
 #include "changenodesourcecommand.h"
 #include "endpuppetcommand.h"
 #include "debugoutputcommand.h"
+#include "puppetalivecommand.h"
 
 namespace QmlDesigner {
 
@@ -81,6 +82,9 @@ NodeInstanceClientProxy::NodeInstanceClientProxy(QObject *parent)
       m_writeCommandCounter(0),
       m_synchronizeId(-1)
 {
+    connect(&m_puppetAliveTimer, SIGNAL(timeout()), this, SLOT(sendPuppetAliveCommand()));
+    m_puppetAliveTimer.setInterval(300);
+    m_puppetAliveTimer.start();
 }
 
 void NodeInstanceClientProxy::initializeSocket()
@@ -227,6 +231,11 @@ void NodeInstanceClientProxy::debugOutput(const DebugOutputCommand &command)
     writeCommand(QVariant::fromValue(command));
 }
 
+void NodeInstanceClientProxy::puppetAlive(const PuppetAliveCommand &command)
+{
+    writeCommand(QVariant::fromValue(command));
+}
+
 void NodeInstanceClientProxy::flush()
 {
 }
@@ -302,6 +311,11 @@ void NodeInstanceClientProxy::readDataStream()
     }
 }
 
+void NodeInstanceClientProxy::sendPuppetAliveCommand()
+{
+    puppetAlive(PuppetAliveCommand());
+}
+
 NodeInstanceServerInterface *NodeInstanceClientProxy::nodeInstanceServer() const
 {
     return m_nodeInstanceServer;