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source: code/branches/tutorial6/src/libraries/network/packet/Packet.cc @ 11815

Last change on this file since 11815 was 11071, checked in by landauf, 9 years ago

merged branch cpp11_v3 back to trunk

  • Property svn:eol-style set to native
File size: 7.9 KB
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1/*
2 *   ORXONOX - the hottest 3D action shooter ever to exist
3 *                    > www.orxonox.net <
4 *
5 *
6 *   License notice:
7 *
8 *   This program is free software; you can redistribute it and/or
9 *   modify it under the terms of the GNU General Public License
10 *   as published by the Free Software Foundation; either version 2
11 *   of the License, or (at your option) any later version.
12 *
13 *   This program is distributed in the hope that it will be useful,
14 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
15 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 *   GNU General Public License for more details.
17 *
18 *   You should have received a copy of the GNU General Public License
19 *   along with this program; if not, write to the Free Software
20 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
21 *
22 *   Author:
23 *      Oliver Scheuss, (C) 2008
24 *   Co-authors:
25 *      ...
26 *
27 */
28
29
30#include "Packet.h"
31
32#include <cassert>
33#include <cstring>
34#define WIN32_LEAN_AND_MEAN
35#include <enet/enet.h>
36#include <boost/thread/mutex.hpp>
37
38#include "util/Output.h"
39#include "Acknowledgement.h"
40#include "Chat.h"
41#include "ClassID.h"
42#include "DeleteObjects.h"
43#include "FunctionCalls.h"
44#include "FunctionIDs.h"
45#include "Gamestate.h"
46#include "Welcome.h"
47#include "network/Host.h"
48// #include "network/ClientInformation.h"
49
50namespace orxonox{
51
52namespace packet{
53
54// Make sure we assume the right values
55static_assert(static_cast<int>(PacketFlag::Reliable)    == static_cast<int>(ENET_PACKET_FLAG_RELIABLE),    "check enum");
56static_assert(static_cast<int>(PacketFlag::Unsequenced) == static_cast<int>(ENET_PACKET_FLAG_UNSEQUENCED), "check enum");
57static_assert(static_cast<int>(PacketFlag::NoAllocate)  == static_cast<int>(ENET_PACKET_FLAG_NO_ALLOCATE), "check enum");
58
59#define PACKET_FLAG_DEFAULT PacketFlag::NoAllocate
60#define _PACKETID           0
61
62std::map<size_t, Packet *> Packet::packetMap_;
63boost::mutex Packet::packetMapMutex_;
64
65Packet::Packet()
66{
67  flags_ = PACKET_FLAG_DEFAULT;
68  packetDirection_ = Direction::Outgoing;
69  peerID_=0;
70  data_=nullptr;
71  enetPacket_=nullptr;
72  bDataENetAllocated_ = false;
73}
74
75Packet::Packet(uint8_t *data, unsigned int peerID)
76{
77  flags_ = PACKET_FLAG_DEFAULT;
78  packetDirection_ = Direction::Incoming;
79  peerID_=peerID;
80  data_=data;
81  enetPacket_=nullptr;
82  bDataENetAllocated_ = false;
83}
84
85
86Packet::Packet(const Packet &p)
87{
88  enetPacket_=p.enetPacket_;
89  flags_=p.flags_;
90  packetDirection_ = p.packetDirection_;
91  peerID_ = p.peerID_;
92  if(p.data_){
93    data_ = new uint8_t[p.getSize()];
94    memcpy(data_, p.data_, p.getSize());
95  }else
96    data_=nullptr;
97  bDataENetAllocated_ = p.bDataENetAllocated_;
98}
99
100/**
101@brief
102    Destroys a packet completely.
103
104    That also means destroying the ENetPacket if one exists. There
105*/
106Packet::~Packet()
107{
108  // Deallocate data_ memory if necessary.
109  if (this->bDataENetAllocated_)
110  {
111    // In this case ENet allocated data_ and will destroy it.
112  }
113  else if (this->data_)
114  {
115    // This destructor was probably called as a consequence of ENet executing our callback.
116    // It simply serves us to be able to deallocate the packet content (data_) ourselves since
117    // we have created it in the first place.
118    delete[] this->data_;
119  }
120
121  // Destroy the ENetPacket if necessary.
122  // Note: For the case ENet used the callback to destroy the packet, we have already set
123  // enetPacket_ to nullptr to avoid destroying it again.
124  if (this->enetPacket_)
125  {
126    // enetPacket_->data gets destroyed too by ENet if it was allocated by it.
127    enet_packet_destroy(enetPacket_);
128  }
129}
130
131bool Packet::send(orxonox::Host* host)
132{
133  if(packetDirection_ != Direction::Outgoing && packetDirection_ != Direction::Bidirectional )
134  {
135    assert(0);
136    return false;
137  }
138  if(!enetPacket_)
139  {
140    if(!data_){
141      assert(0);
142      return false;
143    }
144    // We deliver ENet the data address so that it doesn't memcpy everything again.
145    // --> We have to delete data_ ourselves!
146    enetPacket_ = enet_packet_create(getData(), getSize(), getFlags());
147    enetPacket_->freeCallback = &Packet::deletePacket;
148    // Add the packet to a global list so we can access it again once enet calls our
149    // deletePacket method. We can of course only give a one argument function to the ENet C library.
150    {
151      // Assures we don't create a packet and destroy it right after in another thread
152      // without having a reference in the packetMap_
153      Packet::packetMapMutex_.lock();
154      packetMap_[reinterpret_cast<size_t>(enetPacket_)] = this;
155      Packet::packetMapMutex_.unlock();
156    }
157  }
158#ifndef NDEBUG
159  switch( *(Type *)(data_ + _PACKETID) )
160  {
161    case Type::Acknowledgement:
162    case Type::Chat:
163    case Type::ClassID:
164    case Type::Gamestate:
165    case Type::Welcome:
166    case Type::DeleteObjects:
167    case Type::FunctionIDs:
168    case Type::FunctionCalls:
169      break;
170    default:
171      assert(0); //there was some error, if this is the case
172      break;
173  }
174#endif
175//  ENetPacket *temp = enetPacket_;
176//  enetPacket_ = nullptr; // otherwise we have a double free because enet already handles the deallocation of the packet
177  if( this->flags_ & PacketFlag::Reliable )
178    host->addPacket( enetPacket_, peerID_, NETWORK_CHANNEL_DEFAULT);
179  else
180    host->addPacket( enetPacket_, peerID_, NETWORK_CHANNEL_UNRELIABLE);
181  return true;
182}
183
184Packet *Packet::createPacket(ENetPacket* packet, uint32_t peerID)
185{
186  uint8_t *data = packet->data;
187//   assert(ClientInformation::findClient(&peer->address)->getID() != static_cast<unsigned int>(-2) || !Host::isServer());
188//   unsigned int peerID = ClientInformation::findClient(&peer->address)->getID();
189  // HACK
190//   if( peerID==static_cast<unsigned int>(-2))
191//     peerID = NETWORK_PEER_ID_SERVER;
192  Packet *p = nullptr;
193//   orxout(verbose_ultra, context::packets) << "packet type: " << *(Type *)&data[_PACKETID] << endl;
194  switch( *(Type *)(data + _PACKETID) )
195  {
196    case Type::Acknowledgement:
197//       orxout(verbose_more, context::packets) << "ack" << endl;
198    p = new Acknowledgement( data, peerID );
199      break;
200    case Type::Chat:
201//       orxout(verbose_more, context::packets) << "chat" << endl;
202      p = new Chat( data, peerID );
203      break;
204    case Type::ClassID:
205//       orxout(verbose_more, context::packets) << "classid" << endl;
206      p = new ClassID( data, peerID );
207      break;
208    case Type::Gamestate:
209//       orxout(verbose_more, context::packets) << "gamestate" << endl;
210      p = new Gamestate( data, peerID );
211      break;
212    case Type::Welcome:
213//       orxout(verbose_more, context::packets) << "welcome" << endl;
214      p = new Welcome( data, peerID );
215      break;
216    case Type::DeleteObjects:
217//       orxout(verbose_more, context::packets) << "deleteobjects" << endl;
218      p = new DeleteObjects( data, peerID );
219      break;
220    case Type::FunctionCalls:
221//       orxout(verbose_more, context::packets) << "functionCalls" << endl;
222      p = new FunctionCalls( data, peerID );
223      break;
224    case Type::FunctionIDs:
225//       orxout(verbose_more, context::packets) << "functionIDs" << endl;
226      p = new FunctionIDs( data, peerID );
227      break;
228    default:
229      assert(0);
230      break;
231  }
232
233  // Data was created by ENet
234  p->bDataENetAllocated_ = true;
235  p->enetPacket_ = packet;
236
237  return p;
238}
239
240/**
241@brief
242    ENet calls this method whenever it wants to destroy a packet that contains
243    data we allocated ourselves.
244*/
245void Packet::deletePacket(ENetPacket *enetPacket)
246{
247  // Get our Packet from a global map with all Packets created in the send() method of Packet.
248  Packet::packetMapMutex_.lock();
249  std::map<size_t, Packet*>::iterator it = packetMap_.find(reinterpret_cast<size_t>(enetPacket));
250  assert(it != packetMap_.end());
251  // Make sure we don't delete it again in the destructor
252  it->second->enetPacket_ = nullptr;
253  delete it->second;
254  packetMap_.erase(it);
255  Packet::packetMapMutex_.unlock();
256//   orxout(verbose_ultra, context::packets) << "PacketMap size: " << packetMap_.size() << endl;
257}
258
259} // namespace packet
260
261} // namespace orxonox
262
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