ServerCore/EPoll.cpp

#include "Thread.h"
#include "EPoll.h"
#include "Command.h"
#include "Exception.h"

namespace core {
   
   EPoll::EPoll() : Command() {
      
      coreutils::Log(coreutils::LOG_DEBUG_2) << "EPoll object being constructed.";
      
      maxSockets = 1000;
      epfd = epoll_create1(0);   
      terminateThreads = false;   
   }
   
   EPoll::~EPoll() {
      coreutils::Log(coreutils::LOG_DEBUG_2) << "BMAEPoll destructed.";
   }
   
   bool EPoll::start(int numberOfThreads, int maxSockets) {
      
      coreutils::Log(coreutils::LOG_DEBUG_2) << "Starting epoll event processing.";
      
      this->numberOfThreads = numberOfThreads;
      
      coreutils::Log(coreutils::LOG_DEBUG_3) << "Number of threads starting is " << numberOfThreads << ".";
      coreutils::Log(coreutils::LOG_DEBUG_3) << "Maximum connections is " << maxSockets << ".";
      
      // TODO: Set the number of maximum open files to the maxSockets value.
      // 
      //----------------------------------------------------------------------
      // Create thread objects into vector for number of threads requested.
      // Hand all the threads a pointer to the EPoll object so they can run
      // the socket handlers.
      //----------------------------------------------------------------------
      
      for(int ix = 0; ix < numberOfThreads; ++ix) 
        threads.emplace_back(*this);
      
      for(int ix = 0; ix < numberOfThreads; ++ix)
        threads[ix].start();
      
      return true;   
   }
   
   bool EPoll::stop() {
      
      terminateThreads = true;
      
      //--------------------------------------------------------
      // Kill and join all the threads that have been started.
      //--------------------------------------------------------
      
      for(int ix = 0; ix < numberOfThreads; ++ix)
        threads[ix].join();
      
      //--------------------------
      // Close the epoll socket.
      //--------------------------
      
      close(epfd);
      
      return true;      
   }
   
   bool EPoll::isStopping() {
      return terminateThreads;
   }
   
   bool EPoll::registerSocket(Socket *socket) {
      coreutils::Log(coreutils::LOG_DEBUG_2) << "0001-" << socket->getDescriptor();
      std::map<int, Socket *>::iterator temp = sockets.find(socket->getDescriptor());
      coreutils::Log(coreutils::LOG_DEBUG_2) << "0002-" << socket->getDescriptor();
      if(temp != sockets.end()) 
        throw coreutils::Exception("Attempt to register socket that is already registered.");
      coreutils::Log(coreutils::LOG_DEBUG_2) << "0003-" << socket->getDescriptor();
      coreutils::Log(coreutils::LOG_DEBUG_3) << "Registering socket " << socket->getDescriptor() << ".";
      sockets.insert(std::pair<int, Socket *>(socket->getDescriptor(), socket));
      coreutils::Log(coreutils::LOG_DEBUG_2) << "0004-" << socket->getDescriptor();
      enableSocket(socket);
      coreutils::Log(coreutils::LOG_DEBUG_2) << "0005-" << socket->getDescriptor();
      return true;
   }
   
   bool EPoll::unregisterSocket(Socket *socket /**< The Socket to unregister. */) {
      lock.lock();
      disableSocket(socket);
      coreutils::Log(coreutils::LOG_DEBUG_3) << "Unregistering socket " << socket->getDescriptor() << ".";
      std::map<int, Socket *>::iterator temp = sockets.find(socket->getDescriptor());
      if(temp == sockets.end()) 
        throw coreutils::Exception("Attempt to unregister socket that is not registered.");
      sockets.erase(temp);   
      lock.unlock();
      return true;   
   }
   
   void EPoll::eventReceived(struct epoll_event event) {
      std::map<int, Socket *>::iterator socket = sockets.find(event.data.fd);
      if(socket != sockets.end()) {	   
	 if(socket->second->eventReceived(event)) {	      
	    coreutils::Log(coreutils::LOG_DEBUG_4) << "resetSocket from eventReceived.";	   
	    resetSocket(socket->second);	 
	 }	 
      }	 
      else
	throw coreutils::Exception("Reference to socket that has no object.");
      
   }
   
   int EPoll::getDescriptor() {
      return epfd;
   }
   
   int EPoll::processCommand(std::string command, TCPSession *session, std::stringstream &data) {
      int sequence = 0;      
      for(auto threadx : threads) {
         data << "|" << ++sequence;
         threadx.output(data); 
         data << "|" << std::endl;
      }      
   }
   
   void EPoll::enableSocket(Socket *socket) {
      struct epoll_event event;
      event.data.fd = socket->getDescriptor();
      event.events = EPOLLIN | EPOLLONESHOT | EPOLLRDHUP | EPOLLET;
      if(socket->needsToWrite())
	event.events |= EPOLLWRNORM;
      epoll_ctl(epfd, EPOLL_CTL_ADD, event.data.fd, &event);
      socket->active = true;
      coreutils::Log(coreutils::LOG_DEBUG_4) << "Enabling socket " << socket->getDescriptor() << " for events.";
   }
   
   void EPoll::disableSocket(Socket *socket) {
      epoll_ctl(epfd, EPOLL_CTL_DEL, socket->getDescriptor(), NULL);
      socket->active = false;
      coreutils::Log(coreutils::LOG_DEBUG_4) << "Disabling socket " << socket->getDescriptor() << " from events.";
   }
   
   void EPoll::resetSocket(Socket *socket) { 
      if(!socket->active)
	return;
      coreutils::Log(coreutils::LOG_DEBUG_4) << "ResetSocket " << socket;
      struct epoll_event event;
      event.data.fd = socket->getDescriptor();
      event.events = EPOLLIN | EPOLLONESHOT | EPOLLRDHUP | EPOLLET;
      if(socket->needsToWrite())
	event.events |= EPOLLWRNORM;
      epoll_ctl(epfd, EPOLL_CTL_MOD, event.data.fd, &event);
      coreutils::Log(coreutils::LOG_DEBUG_4) << "Resetting socket " << socket->getDescriptor() << " for events.";
   }
         
}