client.cpp Example File

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  #include <QtNetwork>

  #include "client.h"
  #include "connection.h"
  #include "peermanager.h"

  Client::Client()
  {
      peerManager = new PeerManager(this);
      peerManager->setServerPort(server.serverPort());
      peerManager->startBroadcasting();

      QObject::connect(peerManager, SIGNAL(newConnection(Connection*)),
                       this, SLOT(newConnection(Connection*)));
      QObject::connect(&server, SIGNAL(newConnection(Connection*)),
                       this, SLOT(newConnection(Connection*)));
  }

  void Client::sendMessage(const QString &message)
  {
      if (message.isEmpty())
          return;

      QList<Connection *> connections = peers.values();
      foreach (Connection *connection, connections)
          connection->sendMessage(message);
  }

  QString Client::nickName() const
  {
      return QString(peerManager->userName()) + '@' + QHostInfo::localHostName()
             + ':' + QString::number(server.serverPort());
  }

  bool Client::hasConnection(const QHostAddress &senderIp, int senderPort) const
  {
      if (senderPort == -1)
          return peers.contains(senderIp);

      if (!peers.contains(senderIp))
          return false;

      QList<Connection *> connections = peers.values(senderIp);
      foreach (Connection *connection, connections) {
          if (connection->peerPort() == senderPort)
              return true;
      }

      return false;
  }

  void Client::newConnection(Connection *connection)
  {
      connection->setGreetingMessage(peerManager->userName());

      connect(connection, SIGNAL(error(QAbstractSocket::SocketError)),
              this, SLOT(connectionError(QAbstractSocket::SocketError)));
      connect(connection, SIGNAL(disconnected()), this, SLOT(disconnected()));
      connect(connection, SIGNAL(readyForUse()), this, SLOT(readyForUse()));
  }

  void Client::readyForUse()
  {
      Connection *connection = qobject_cast<Connection *>(sender());
      if (!connection || hasConnection(connection->peerAddress(),
                                       connection->peerPort()))
          return;

      connect(connection, SIGNAL(newMessage(QString,QString)),
              this, SIGNAL(newMessage(QString,QString)));

      peers.insert(connection->peerAddress(), connection);
      QString nick = connection->name();
      if (!nick.isEmpty())
          emit newParticipant(nick);
  }

  void Client::disconnected()
  {
      if (Connection *connection = qobject_cast<Connection *>(sender()))
          removeConnection(connection);
  }

  void Client::connectionError(QAbstractSocket::SocketError /* socketError */)
  {
      if (Connection *connection = qobject_cast<Connection *>(sender()))
          removeConnection(connection);
  }

  void Client::removeConnection(Connection *connection)
  {
      if (peers.contains(connection->peerAddress())) {
          peers.remove(connection->peerAddress());
          QString nick = connection->name();
          if (!nick.isEmpty())
              emit participantLeft(nick);
      }
      connection->deleteLater();
  }