StreamConnection.cpp

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/*
 * StreamConnection.cpp
 *
 * 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.
 *
 */

#include "ibrdtn/streams/StreamConnection.h"
#include "ibrdtn/data/Exceptions.h"
#include "ibrdtn/streams/StreamContactHeader.h"
#include "ibrdtn/streams/StreamDataSegment.h"
#include "ibrdtn/data/Exceptions.h"
#include <ibrcommon/TimeMeasurement.h>
#include <ibrcommon/Logger.h>

using namespace dtn::data;

namespace dtn
{
        namespace streams
        {
                StreamConnection::StreamConnection(StreamConnection::Callback &cb, iostream &stream, const dtn::data::Length buffer_size)
                 : std::iostream(&_buf), _callback(cb), _buf(*this, stream, buffer_size), _shutdown_reason(CONNECTION_SHUTDOWN_NOTSET)
                {
                }

                StreamConnection::~StreamConnection()
                {
                }

                void StreamConnection::handshake(const dtn::data::EID &eid, const dtn::data::Timeout &timeout, const dtn::data::Bitset<StreamContactHeader::HEADER_BITS> &flags)
                {
                        // create a new header
                        dtn::streams::StreamContactHeader header(eid);

                        // set timeout
                        header._keepalive = static_cast<uint16_t>(timeout);

                        // set flags
                        header._flags = flags;

                        // do the handshake
                        _peer = _buf.handshake(header);

                        // signal the complete handshake
                        _callback.eventConnectionUp(_peer);
                }

                void StreamConnection::reject()
                {
                        _buf.reject();
                }

                void StreamConnection::keepalive()
                {
                        _buf.keepalive();
                }

                void StreamConnection::shutdown(ConnectionShutdownCases csc)
                {
                        if (csc == CONNECTION_SHUTDOWN_SIMPLE_SHUTDOWN)
                        {
                                // wait for the last ACKs
                                _buf.wait();
                        }

                        // skip if another shutdown is in progress
                        {
                                ibrcommon::MutexLock l(_shutdown_reason_lock);
                                if (_shutdown_reason != CONNECTION_SHUTDOWN_NOTSET)
                                {
                                        _buf.abort();
                                        return;
                                }
                                _shutdown_reason = csc;
                        }
                        
                        try {
                                switch (csc)
                                {
                                        case CONNECTION_SHUTDOWN_IDLE:
                                                _buf.shutdown(StreamDataSegment::MSG_SHUTDOWN_IDLE_TIMEOUT);
                                                _buf.abort();
                                                _callback.eventTimeout();
                                                break;
                                        case CONNECTION_SHUTDOWN_ERROR:
                                                _buf.abort();
                                                _callback.eventError();
                                                break;
                                        case CONNECTION_SHUTDOWN_SIMPLE_SHUTDOWN:
                                                _buf.shutdown(StreamDataSegment::MSG_SHUTDOWN_NONE);
                                                _callback.eventShutdown(csc);
                                                break;
                                        case CONNECTION_SHUTDOWN_NODE_TIMEOUT:
                                                _buf.abort();
                                                _callback.eventTimeout();
                                                break;
                                        case CONNECTION_SHUTDOWN_PEER_SHUTDOWN:
                                                _buf.shutdown(StreamDataSegment::MSG_SHUTDOWN_NONE);
                                                _buf.abort();
                                                _callback.eventShutdown(csc);
                                                break;
                                        case CONNECTION_SHUTDOWN_NOTSET:
                                                _buf.abort();
                                                _callback.eventShutdown(csc);
                                                break;
                                }
                        } catch (const StreamConnection::StreamErrorException&) {
                                _callback.eventError();
                        }

                        _buf.close();
                        _callback.eventConnectionDown();
                }

                void StreamConnection::eventShutdown(StreamConnection::ConnectionShutdownCases csc)
                {
                        _callback.eventShutdown(csc);
                }

                void StreamConnection::eventBundleAck(const dtn::data::Length &ack)
                {
                        _callback.eventBundleAck(ack);
                }

                void StreamConnection::eventBundleRefused()
                {
                        IBRCOMMON_LOGGER_DEBUG_TAG("StreamConnection", 20) << "bundle has been refused" << IBRCOMMON_LOGGER_ENDL;
                        _callback.eventBundleRefused();
                }

                void StreamConnection::eventBundleForwarded()
                {
                        IBRCOMMON_LOGGER_DEBUG_TAG("StreamConnection", 20) << "bundle has been forwarded" << IBRCOMMON_LOGGER_ENDL;
                        _callback.eventBundleForwarded();
                }

                void StreamConnection::connectionTimeout()
                {
                        // call superclass
                        _callback.eventTimeout();
                }

                void StreamConnection::enableIdleTimeout(const dtn::data::Timeout &seconds)
                {
                        _buf.enableIdleTimeout(seconds);
                }
        }
}