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HTTPTimeServer.cpp

//
// HTTPTimeServer.cpp
//
// $Id: //poco/1.2/Net/samples/HTTPTimeServer/src/HTTPTimeServer.cpp#2 $
//
// This sample demonstrates the HTTPServer and related classes.
//
// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/Net/HTTPServer.h"
#include "Poco/Net/HTTPRequestHandler.h"
#include "Poco/Net/HTTPRequestHandlerFactory.h"
#include "Poco/Net/HTTPServerParams.h"
#include "Poco/Net/HTTPServerRequest.h"
#include "Poco/Net/HTTPServerResponse.h"
#include "Poco/Net/HTTPServerParams.h"
#include "Poco/Net/ServerSocket.h"
#include "Poco/Timestamp.h"
#include "Poco/DateTimeFormatter.h"
#include "Poco/DateTimeFormat.h"
#include "Poco/Exception.h"
#include "Poco/ThreadPool.h"
#include "Poco/Util/ServerApplication.h"
#include "Poco/Util/Option.h"
#include "Poco/Util/OptionSet.h"
#include "Poco/Util/HelpFormatter.h"
#include <iostream>


using Poco::Net::ServerSocket;
using Poco::Net::HTTPRequestHandler;
using Poco::Net::HTTPRequestHandlerFactory;
using Poco::Net::HTTPServer;
using Poco::Net::HTTPServerRequest;
using Poco::Net::HTTPServerResponse;
using Poco::Net::HTTPServerParams;
using Poco::Timestamp;
using Poco::DateTimeFormatter;
using Poco::DateTimeFormat;
using Poco::ThreadPool;
using Poco::Util::ServerApplication;
using Poco::Util::Application;
using Poco::Util::Option;
using Poco::Util::OptionSet;
using Poco::Util::HelpFormatter;


00073 class TimeRequestHandler: public HTTPRequestHandler
      /// Return a HTML document with the current date and time.
{
public:
      TimeRequestHandler(const std::string& format): 
            _format(format)
      {
      }
      
00082       void handleRequest(HTTPServerRequest& request, HTTPServerResponse& response)
      {
            Application& app = Application::instance();
            app.logger().information("Request from " + request.clientAddress().toString());

            Timestamp now;
            std::string dt(DateTimeFormatter::format(now, _format));

            response.setChunkedTransferEncoding(true);
            response.setContentType("text/html");

            std::ostream& ostr = response.send();
            ostr << "<html><head><title>HTTPTimeServer powered by C++ Portable Components</title>";
            ostr << "<meta http-equiv=\"refresh\" content=\"1\"></head>";
            ostr << "<body><p style=\"text-align: center; font-size: 48px;\">";
            ostr << dt;
            ostr << "</p></body></html>";
      }
      
private:
      std::string _format;
};


class TimeRequestHandlerFactory: public HTTPRequestHandlerFactory
{
public:
      TimeRequestHandlerFactory(const std::string& format):
            _format(format)
      {
      }

      HTTPRequestHandler* createRequestHandler(const HTTPServerRequest& request)
      {
            if (request.getURI() == "/")
                  return new TimeRequestHandler(_format);
            else
                  return 0;
      }
      
private:
      std::string _format;
};


00127 class HTTPTimeServer: public Poco::Util::ServerApplication
      /// The main application class.
      ///
      /// This class handles command-line arguments and
      /// configuration files.
      /// Start the HTTPTimeServer executable with the help
      /// option (/help on Windows, --help on Unix) for
      /// the available command line options.
      ///
      /// To use the sample configuration file (HTTPTimeServer.properties),
      /// copy the file to the directory where the HTTPTimeServer executable
      /// resides. If you start the debug version of the HTTPTimeServer
      /// (HTTPTimeServerd[.exe]), you must also create a copy of the configuration
      /// file named HTTPTimeServerd.properties. In the configuration file, you
      /// can specify the port on which the server is listening (default
      /// 9980) and the format of the date/time string sent back to the client.
      ///
      /// To test the TimeServer you can use any web browser (http://localhost:9980/).
{
public:
      HTTPTimeServer(): _helpRequested(false)
      {
      }
      
      ~HTTPTimeServer()
      {
      }

protected:
00156       void initialize(Application& self)
      {
            loadConfiguration(); // load default configuration files, if present
            ServerApplication::initialize(self);
      }
            
00162       void uninitialize()
      {
            ServerApplication::uninitialize();
      }

00167       void defineOptions(OptionSet& options)
      {
            ServerApplication::defineOptions(options);
            
            options.addOption(
                  Option("help", "h", "display help information on command line arguments")
                        .required(false)
                        .repeatable(false));
      }

00177       void handleOption(const std::string& name, const std::string& value)
      {
            ServerApplication::handleOption(name, value);

            if (name == "help")
                  _helpRequested = true;
      }

      void displayHelp()
      {
            HelpFormatter helpFormatter(options());
            helpFormatter.setCommand(commandName());
            helpFormatter.setUsage("OPTIONS");
            helpFormatter.setHeader("A web server that serves the current date and time.");
            helpFormatter.format(std::cout);
      }

00194       int main(const std::vector<std::string>& args)
      {
            if (_helpRequested)
            {
                  displayHelp();
            }
            else
            {
                  // get parameters from configuration file
                  unsigned short port = (unsigned short) config().getInt("HTTPTimeServer.port", 9980);
                  std::string format(config().getString("HTTPTimeServer.format", DateTimeFormat::SORTABLE_FORMAT));
                  int maxQueued  = config().getInt("HTTPTimeServer.maxQueued", 100);
                  int maxThreads = config().getInt("HTTPTimeServer.maxThreads", 16);
                  ThreadPool::defaultPool().addCapacity(maxThreads);
                  
                  HTTPServerParams* pParams = new HTTPServerParams;
                  pParams->setMaxQueued(maxQueued);
                  pParams->setMaxThreads(maxThreads);
                  
                  // set-up a server socket
                  ServerSocket svs(port);
                  // set-up a HTTPServer instance
                  HTTPServer srv(new TimeRequestHandlerFactory(format), svs, pParams);
                  // start the HTTPServer
                  srv.start();
                  // wait for CTRL-C or kill
                  waitForTerminationRequest();
                  // Stop the HTTPServer
                  srv.stop();
            }
            return Application::EXIT_OK;
      }
      
private:
      bool _helpRequested;
};


int main(int argc, char** argv)
{
      HTTPTimeServer app;
      return app.run(argc, argv);
}

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