RWebWindowsManager.hxx

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// Author: Sergey Linev <s.linev@gsi.de>
// Date: 2017-10-16
// Warning: This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback is welcome!
 
/*************************************************************************
 * Copyright (C) 1995-2019, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT7_RWebWindowsManager
#define ROOT7_RWebWindowsManager
 
#include <memory>
#include <string>
#include <thread>
#include <mutex>
#include <functional>
 
#include "THttpEngine.h"
 
#include <ROOT/RWebWindow.hxx>
 
class THttpServer;
class THttpWSHandler;
class TExec;
 
namespace ROOT {
 
/// function signature for catching show calls of arbitrary RWebWindow
/// if returns true, normal show procedure will not be invoked
using WebWindowShowCallback_t = std::function<bool(RWebWindow &, const RWebDisplayArgs &)>;
 
class RWebWindowsManager {
 
   friend class RWebWindow;
 
private:
   std::unique_ptr<THttpServer> fServer;  ///<! central communication with the all used displays
   std::string fAddr;                     ///<! HTTP address of the server
   std::string fSessionKey;               ///<! secret session key used on client to code connections keys
   bool fUseSessionKey{false};            ///<! is session key has to be used for data signing
   std::recursive_mutex fMutex;           ///<! main mutex, used for window creations
   unsigned fIdCnt{0};                    ///<! counter for identifiers
   bool fUseHttpThrd{false};              ///<! use special thread for THttpServer
   bool fUseSenderThreads{false};         ///<! use extra threads for sending data from RWebWindow to clients
   float fLaunchTmout{30.};               ///<! timeout in seconds to start browser process, default 30s
   bool fExternalProcessEvents{false};    ///<! indicate that there are external process events engine
   std::unique_ptr<TExec> fAssgnExec;     ///<! special exec to assign thread id via ProcessEvents
   WebWindowShowCallback_t fShowCallback; ///<! function called for each RWebWindow::Show call
 
   /// Returns true if http server use special thread for requests processing (default off)
   bool IsUseHttpThread() const { return fUseHttpThrd; }
 
   /// Returns true if extra threads to send data via websockets will be used (default off)
   bool IsUseSenderThreads() const { return fUseSenderThreads; }
 
   /// Returns timeout for launching new browser process
   float GetLaunchTmout() const { return fLaunchTmout; }
 
   void Unregister(RWebWindow &win);
 
   /// Show window in specified location, see Show() method for more details
   unsigned ShowWindow(RWebWindow &win, const RWebDisplayArgs &args);
 
   int WaitFor(RWebWindow &win, WebWindowWaitFunc_t check, bool timed = false, double tm = -1);
 
   std::string GetUrl(RWebWindow &win, bool remote = false, std::string *produced_key = nullptr);
 
   bool CreateServer(bool with_http = false);
 
   bool InformListener(const std::string &msg);
 
   static std::string GenerateKey(int keylen = 32);
 
public:
   RWebWindowsManager();
 
   ~RWebWindowsManager();
 
   /// Returns THttpServer instance
   THttpServer *GetServer() const { return fServer.get(); }
 
   /// Returns http address of the server, empty string when not available
   std::string GetServerAddr() const { return fAddr; }
 
   /// Assign show callback which can catch window showing, used by RBrowser
   void SetShowCallback(WebWindowShowCallback_t func) { fShowCallback = func; }
 
   static std::shared_ptr<RWebWindowsManager> &Instance();
 
   std::shared_ptr<RWebWindow> CreateWindow();
 
   void Terminate();
 
   static bool IsMainThrd();
   static void AssignMainThrd();
 
   static void SetLoopbackMode(bool on = true);
   static bool IsLoopbackMode();
 
   static void SetUseSessionKey(bool on = true);
   static void SetUseConnectionKey(bool on = true);
};
 
} // namespace ROOT
 
#endif