1 | // |
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2 | // C++ Interface: ClientConnection |
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3 | // |
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4 | // Description: The Class ClientConnection manages the servers conenctions to the clients. |
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5 | // each connection is provided by a new process. communication between master process and |
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6 | // connection processes is provided by ... |
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7 | // |
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8 | // |
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9 | // Author: Oliver Scheuss |
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10 | // |
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11 | |
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12 | #include "ClientConnection.h" |
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13 | |
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14 | #ifdef WIN32 |
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15 | #include <windows.h> |
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16 | #define usleep(x) Sleep((x)/1000) |
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17 | #else |
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18 | #include <unistd.h> |
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19 | #endif |
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20 | |
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21 | namespace network{ |
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22 | |
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23 | static boost::thread_group network_threads; |
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24 | |
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25 | ClientConnection::ClientConnection(int port, std::string address){ |
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26 | quit=false; |
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27 | server=NULL; |
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28 | enet_address_set_host(&serverAddress, address.c_str()); |
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29 | serverAddress.port = NETWORK_PORT; |
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30 | established=false; |
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31 | } |
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32 | |
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33 | ClientConnection::ClientConnection(int port, const char *address){ |
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34 | quit=false; |
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35 | server=NULL; |
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36 | enet_address_set_host(&serverAddress, address); |
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37 | serverAddress.port = NETWORK_PORT; |
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38 | established=false; |
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39 | } |
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40 | |
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41 | bool ClientConnection::waitEstablished(int milisec){ |
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42 | for(int i=0; i<=milisec && !established; i++) |
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43 | usleep(1000); |
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44 | |
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45 | return established; |
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46 | } |
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47 | |
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48 | |
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49 | ENetPacket *ClientConnection::getPacket(ENetAddress &address){ |
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50 | if(!buffer.isEmpty()) |
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51 | return buffer.pop(address); |
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52 | else |
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53 | return NULL; |
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54 | } |
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55 | |
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56 | ENetPacket *ClientConnection::getPacket(){ |
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57 | ENetAddress address; |
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58 | return getPacket(address); |
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59 | } |
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60 | |
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61 | bool ClientConnection::queueEmpty(){ |
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62 | return buffer.isEmpty(); |
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63 | } |
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64 | |
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65 | bool ClientConnection::createConnection(){ |
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66 | network_threads.create_thread(boost::bind(boost::mem_fn(&ClientConnection::receiverThread), this)); |
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67 | // wait 10 seconds for the connection to be established |
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68 | return waitEstablished(10000); |
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69 | } |
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70 | |
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71 | bool ClientConnection::closeConnection(){ |
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72 | quit=true; |
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73 | network_threads.join_all(); |
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74 | established=false; |
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75 | return true; |
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76 | } |
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77 | |
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78 | |
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79 | bool ClientConnection::addPacket(ENetPacket *packet){ |
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80 | if(server==NULL) |
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81 | return false; |
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82 | if(enet_peer_send(server, 1, packet)!=0) |
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83 | return false; |
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84 | else |
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85 | return true; |
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86 | } |
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87 | |
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88 | bool ClientConnection::sendPackets(ENetEvent *event){ |
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89 | if(server==NULL) |
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90 | return false; |
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91 | if(enet_host_service(client, event, NETWORK_SEND_WAIT)>=0) |
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92 | return true; |
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93 | else |
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94 | return false; |
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95 | } |
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96 | |
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97 | bool ClientConnection::sendPackets(){ |
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98 | ENetEvent event; |
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99 | if(server==NULL) |
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100 | return false; |
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101 | if(enet_host_service(client, &event, NETWORK_SEND_WAIT)>=0) |
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102 | return true; |
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103 | else |
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104 | return false; |
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105 | } |
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106 | |
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107 | void ClientConnection::receiverThread(){ |
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108 | // what about some error-handling here ? |
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109 | enet_initialize(); |
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110 | atexit(enet_deinitialize); |
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111 | ENetEvent event; |
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112 | client = enet_host_create(NULL, NETWORK_CLIENT_MAX_CONNECTIONS, 0, 0); |
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113 | if(client==NULL) |
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114 | // add some error handling here ========================== |
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115 | quit=true; |
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116 | //connect to the server |
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117 | if(!establishConnection()){ |
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118 | quit=true; |
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119 | return; |
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120 | } |
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121 | //main loop |
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122 | while(!quit){ |
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123 | if(enet_host_service(client, &event, NETWORK_WAIT_TIMEOUT)<0){ |
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124 | // we should never reach this point |
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125 | quit=true; |
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126 | // add some error handling here ======================== |
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127 | } |
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128 | switch(event.type){ |
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129 | // log handling ================ |
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130 | case ENET_EVENT_TYPE_CONNECT: |
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131 | case ENET_EVENT_TYPE_RECEIVE: |
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132 | processData(&event); |
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133 | break; |
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134 | case ENET_EVENT_TYPE_DISCONNECT: |
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135 | quit=true; |
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136 | // server closed the connection |
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137 | return; |
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138 | break; |
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139 | case ENET_EVENT_TYPE_NONE: |
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140 | continue; |
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141 | } |
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142 | } |
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143 | // now disconnect |
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144 | |
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145 | if(!disconnectConnection()) |
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146 | // if disconnecting failed destroy conn. |
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147 | enet_peer_reset(server); |
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148 | return; |
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149 | } |
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150 | |
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151 | bool ClientConnection::disconnectConnection(){ |
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152 | ENetEvent event; |
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153 | enet_peer_disconnect(server, 0); |
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154 | while(enet_host_service(client, &event, NETWORK_WAIT_TIMEOUT) > 0){ |
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155 | switch (event.type) |
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156 | { |
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157 | case ENET_EVENT_TYPE_NONE: |
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158 | case ENET_EVENT_TYPE_CONNECT: |
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159 | case ENET_EVENT_TYPE_RECEIVE: |
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160 | enet_packet_destroy(event.packet); |
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161 | break; |
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162 | case ENET_EVENT_TYPE_DISCONNECT: |
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163 | return true; |
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164 | } |
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165 | } |
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166 | enet_peer_reset(server); |
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167 | return false; |
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168 | } |
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169 | |
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170 | bool ClientConnection::establishConnection(){ |
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171 | ENetEvent event; |
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172 | // connect to peer |
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173 | server = enet_host_connect(client, &serverAddress, NETWORK_CLIENT_CHANNELS); |
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174 | if(server==NULL) |
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175 | // error handling |
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176 | return false; |
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177 | // handshake |
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178 | if(enet_host_service(client, &event, NETWORK_WAIT_TIMEOUT)>0 && event.type == ENET_EVENT_TYPE_CONNECT){ |
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179 | established=true; |
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180 | return true; |
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181 | } |
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182 | else |
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183 | return false; |
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184 | } |
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185 | |
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186 | bool ClientConnection::processData(ENetEvent *event){ |
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187 | // just add packet to the buffer |
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188 | // this can be extended with some preprocessing |
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189 | return buffer.push(event); |
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190 | } |
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191 | |
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192 | |
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193 | } |
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