GODT-1917: gRPC service should use random port.

WIP: bridge-gui wait and parse gRPC service config fie.

internal/frontend/bridge-gui/bridge-gui/QMLBackend.cpp

@@ -37,9 +37,9 @@ QMLBackend::QMLBackend()
 
 
 //****************************************************************************************************************************************************
-//
+/// \param[in] serviceConfig
 //****************************************************************************************************************************************************
-void QMLBackend::init()
+void QMLBackend::init(GRPCConfig const &serviceConfig)
 {
     users_ = new UserList(this);
 
@@ -47,7 +47,7 @@ void QMLBackend::init()
     this->connectGrpcEvents();
 
     QString error;
-    if (app().grpc().connectToServer(error))
+    if (app().grpc().connectToServer(serviceConfig, error))
         app().log().info("Connected to backend via gRPC service.");
     else
         throw Exception(QString("Cannot connectToServer to go backend via gRPC: %1").arg(error));

internal/frontend/bridge-gui/bridge-gui/QMLBackend.h

@@ -42,7 +42,7 @@ public: // member functions.
     ~QMLBackend() override = default; ///< Destructor.
     QMLBackend &operator=(QMLBackend const &) = delete; ///< Disabled assignment operator.
     QMLBackend &operator=(QMLBackend &&) = delete; ///< Disabled move assignment operator.
-    void init(); ///< Initialize the backend.
+    void init(GRPCConfig const &serviceConfig); ///< Initialize the backend.
     bool waitForEventStreamReaderToFinish(qint32 timeoutMs); ///< Wait for the event stream reader to finish.
 
     // invokable methods can be called from QML. They generally return a value, which slots cannot do.

internal/frontend/bridge-gui/bridge-gui/main.cpp

@@ -41,6 +41,7 @@ namespace
 
     QString const bridgeLock = "bridge-gui.lock"; ///< file name used for the lock file.
     QString const exeName = "bridge" + exeSuffix; ///< The bridge executable file name.*
+    qint64 const grpcServiceConfigWaitDelayMs = 60000; ///< The wait delay for the gRPC config file in milliseconds.
 }
 
 
@@ -261,9 +262,16 @@ int main(int argc, char *argv[])
         log.setLevel(logLevel);
 
         if (!attach)
+        {
+            // before launching bridge, we remove any trailing service config file, because we need to make sure we get a newly generated one.
+            GRPCClient::removeServiceConfigFile();
             launchBridge(args);
+        }
 
-        app().backend().init();
+        app().backend().init(GRPCClient::waitAndRetrieveServiceConfig(attach ? 0 : grpcServiceConfigWaitDelayMs));
+
+        if (!attach)
+            GRPCClient::removeServiceConfigFile();
 
         QQmlApplicationEngine engine;
         std::unique_ptr<QQmlComponent> rootComponent(createRootQmlComponent(engine));