vsocket.h

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/*
 * vsocket.h
 *
 * Copyright (C) 2011 IBR, TU Braunschweig
 *
 * Written-by: Johannes Morgenroth <morgenroth@ibr.cs.tu-bs.de>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#ifndef VSOCKET_H_
#define VSOCKET_H_

#include <ibrcommon/data/File.h>
#include "ibrcommon/link/LinkManager.h"
#include <ibrcommon/net/socket.h>
#include <ibrcommon/net/vinterface.h>
#include <ibrcommon/net/vaddress.h>
#include <ibrcommon/thread/Mutex.h>
#include <ibrcommon/thread/Conditional.h>
#include <string>
#include <list>
#include <set>
#include <map>

namespace ibrcommon
{
        typedef std::set<basesocket*> socketset;

        class vsocket_timeout : public socket_exception
        {
        public:
                vsocket_timeout(string error) : socket_exception(error)
                {};
        };

        class vsocket_interrupt : public socket_exception
        {
        public:
                vsocket_interrupt(string error) : socket_exception(error)
                {};
        };

        class vsocket
        {
        public:
                vsocket();

                virtual ~vsocket();

                void add(basesocket *socket);

                void add(basesocket *socket, const vinterface &iface);

                void remove(basesocket *socket);

                size_t size() const;

                socketset getAll() const;

                socketset get(const vinterface &iface) const;

                void destroy();

                void clear();

                void up() throw (socket_exception);

                void down() throw ();

                void select(socketset *readset, socketset *writeset, socketset *errorset, struct timeval *tv = NULL) throw (socket_exception);

        private:
                class pipesocket : public basesocket
                {
                public:
                        pipesocket();
                        virtual ~pipesocket();
                        virtual void up() throw (socket_exception);
                        virtual void down() throw (socket_exception);

                        void read(char *buf, size_t len) throw (socket_exception);
                        void write(const char *buf, size_t len) throw (socket_exception);

                        int getOutput() const throw (socket_exception);

                private:
                        int _output_fd;
                };

                class SocketState : public ibrcommon::Conditional {
                public:
                        class state_exception : public Exception
                        {
                        public:
                                state_exception(string error) : Exception(error)
                                {};
                        };

                        enum STATE {
                                NONE,
                                SAFE_DOWN,
                                DOWN,
                                DOWN_REQUEST,
                                PENDING_DOWN,
                                PENDING_UP,
                                IDLE,
                                SELECT,
                                SAFE_REQUEST,
                                SAFE
                        };

                        SocketState(STATE initial);
                        virtual ~SocketState();

                        STATE get() const;

                        void set(STATE s) throw (state_exception);
                        void wait(STATE s, STATE abortstate = NONE) throw (state_exception);
                        void setwait(STATE s, STATE abortstate = NONE) throw (state_exception);

                private:
                        void __change(STATE s);
                        std::string __getname(STATE s) const;

                        STATE _state;
                };

                class SafeLock
                {
                public:
                        SafeLock(SocketState &state, vsocket &sock);
                        virtual ~SafeLock();
                private:
                        SocketState &_state;
                };

                class SelectGuard
                {
                public:
                        SelectGuard(SocketState &state, int &counter, ibrcommon::vsocket &sock);
                        virtual ~SelectGuard();
                private:
                        SocketState &_state;
                        int &_counter;
                        ibrcommon::vsocket &_sock;
                };

                void interrupt();

                ibrcommon::Mutex _socket_lock;
                socketset _sockets;
                std::map<vinterface, socketset> _socket_map;

                pipesocket _pipe;

                SocketState _state;
                int _select_count;
        };
}

#endif /* VSOCKET_H_ */