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/*
 * Copyright (C) 2003-2007 Tommi Maekitalo
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * As a special exception, you may use this file as part of a free
 * software library without restriction. Specifically, if other files
 * instantiate templates or use macros or inline functions from this
 * file, or you compile this file and link it with other files to
 * produce an executable, this file does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License. This exception does not however invalidate any other
 * reasons why the executable file might be covered by the GNU Library
 * General Public License.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */


#ifndef TNT_TNTNET_H
#define TNT_TNTNET_H

#include <tnt/job.h>
#include <tnt/poller.h>
#include <tnt/dispatcher.h>
#include <tnt/maptarget.h>
#include <tnt/scopemanager.h>
#include <cxxtools/condition.h>
#include <cxxtools/mutex.h>
#include <set>
#include <fstream>

namespace tnt
{
  class ListenerBase;
  struct TntConfig;

  /**
   @brief Main application class for stand alone webapplication.

   This is the class to use to run a webapplication as a stand alone
   application. Using this a application runs itself as a webserver instead of
   using a tntnet application server.

   To create a application you need to:
     * instantiate a Tntnet class
     * call listen and/or sslListen for each ip address to listen on
     * set up your url mappings using mapUrl or vMapUrl
     * call run()
   */
  class Tntnet
  {
      friend class Worker;

      unsigned minthreads;
      unsigned maxthreads;

      Jobqueue queue;

      static bool stop;
      typedef std::set<ListenerBase*> listeners_type;
      listeners_type listeners;
      static listeners_type allListeners;

      cxxtools::AttachedThread pollerthread;
      Poller poller;
      Dispatcher dispatcher;

      ScopeManager scopemanager;
      std::string appname;

      std::ofstream accessLog;
      cxxtools::Mutex accessLogMutex;

      // noncopyable
      Tntnet(const Tntnet&);
      Tntnet& operator= (const Tntnet&);

      void timerTask();

      static cxxtools::Condition timerStopCondition;
      static cxxtools::Mutex timeStopMutex;

    public:
      /// Initialize a default Tntnet-application without mappings.
      Tntnet();

      /// Initialize from global configuration
      void init(const TntConfig& config);
      /// Set up a listener on the specified ip address and port.
      /// Listening on the port does not actually happen here but when the
      /// application is started using the run-method.
      void listen(const std::string& ipaddr, unsigned short int port);
      /// Listen on all local interfaces on the specified port.
      void listen(unsigned short int port)
      { listen(std::string(), port); }

      /// Set up a ssl listener on the specified ip address and port.
      /// Listening on the port does not actually happen here but when the
      /// application is started using the run-method.
      void sslListen(const std::string& certificateFile, const std::string& keyFile, const std::string& ipaddr, unsigned short int port);
      /// Listen on all local interfaces on the specified port for ssl requests.
      void sslListen(const std::string& certificateFile, const std::string& keyFile, unsigned short int port)
      { sslListen(certificateFile, keyFile, std::string(), port); }

      /// Starts all needed threads and the application loop.
      /// If no listeners are set up using listen or sslListen, a default
      /// listener is instantiated. By default it listens on the ip address
      /// 0.0.0.0 (i.e. all addresses). The port 80 is used, when started as
      /// root user, port 8000 otherwise.
      void run();

      /// Shut down all instances of tntnet servers.
      static void shutdown();
      /// Tells, if a shutdown request was initiated.
      static bool shouldStop()   { return stop; }

      /// Returns the queue, which helds active http requests.
      Jobqueue&   getQueue()                  { return queue; }
      /// Returns a reference to the poller thread object.
      Poller&     getPoller()                 { return poller; }
      /// Returns a reference to the dispatcher object.
      const Dispatcher& getDispatcher() const { return dispatcher; }
      /// Returns a reference to the scope manager object.
      ScopeManager& getScopemanager()         { return scopemanager; }

      /// Returns the minimum number of worker threads.
      unsigned getMinThreads() const          { return minthreads; }
      /// Sets the minimum number of worker threads.
      void setMinThreads(unsigned n);

      /// Returns the maximum number of worker threads.
      unsigned getMaxThreads() const          { return maxthreads; }
      /// Sets the maximum number of worker threads.
      void setMaxThreads(unsigned n)          { maxthreads = n; }

      /// Adds a mapping from a url to a component.
      /// The url is specified using a regular expression and the mapped target
      /// may contain back references to the expression using $1, $2, ... .
      Mapping& mapUrl(const std::string& url, const std::string& ci)
        { return dispatcher.addUrlMapEntry(std::string(), url, Maptarget(ci)); }
      void mapUrl(const std::string& url, const std::string& pathinfo, const std::string& ci_)
      {
        Maptarget ci(ci_);
        ci.setPathInfo(pathinfo);
        dispatcher.addUrlMapEntry(std::string(), url, ci);
      }
      Mapping& mapUrl(const std::string& url, const Maptarget& ci)
        { return dispatcher.addUrlMapEntry(std::string(), url, ci); }
      Mapping& vMapUrl(const std::string& vhost, const std::string& url, const Maptarget& ci)
        { return dispatcher.addUrlMapEntry(vhost, url, ci); }

      /** Set the app name.

          The app name is used for the session cookie name if the
          webapplication is linked directly to a stand alone application.
          The name of the session cookie is then "tntnet." plus the library
          name of the web application. Since there is no library name, if
          the application is run through the Tntnet application class, this
          application name is used instead.

          Setting the application explicitely reduces potential conflicts if
          multiple tntnet application servers are run on the same host on
          different ports.
       */
      void setAppName(const std::string& appname_)
        { appname = appname_; }
      const std::string& getAppName() const
        { return appname; }

      void setAccessLog(const std::string& accesslog)
      { accessLog.open(accesslog.c_str(), std::ios::out | std::ios::app); }
  };

}

#endif // TNT_TNTNET_H