root / trunk / code / projects / colonet / server / ColonetServer.cpp @ 1390
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1 | 161 | emarinel | /**
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2 | 29 | jknichel | * @file ColonetServer.cpp
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3 | 11 | emarinel | *
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4 | * @brief colonet_server - primary server application for Colonet
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5 | *
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6 | * @author Jason Knichel
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7 | * @author Eugene Marinelli
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8 | * @date 10/31/06
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9 | */
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10 | |||
11 | 118 | emarinel | #include <arpa/inet.h> |
12 | #include <fcntl.h> |
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13 | #include <errno.h> |
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14 | #include <netinet/in.h> |
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15 | #include <string.h> |
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16 | 409 | emarinel | #include <unistd.h> |
17 | 11 | emarinel | #include <sys/select.h> |
18 | #include <sys/socket.h> |
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19 | |||
20 | 20 | jknichel | #include <colonet_wireless.h> |
21 | |||
22 | 391 | emarinel | #include <ColonetServer.h> |
23 | #include <ConnectionPool.h> |
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24 | #include <options.h> |
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25 | #include <Log.h> |
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26 | 11 | emarinel | |
27 | #define LISTEN_BACKLOG 5 |
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28 | #define LOG_BUFFER_LENGTH 128 |
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29 | 424 | emarinel | #define MAX_MSG_BUFFER_LENGTH 128 |
30 | 661 | jknichel | #define REFRESH_VIRTUAL_WALL_PERIOD 400 |
31 | 11 | emarinel | |
32 | 347 | emarinel | #define u_int32_t unsigned |
33 | |||
34 | 29 | jknichel | /**
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35 | * @brief Default constructor for ColonetServer
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36 | */
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37 | 426 | emarinel | ColonetServer::ColonetServer() { |
38 | 24 | jknichel | listen_socket = 0;
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39 | 453 | emarinel | connection_pool = new ConnectionPool(this); |
40 | 20 | jknichel | } |
41 | |||
42 | 29 | jknichel | /**
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43 | * @brief Destructor for ColonetServer
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44 | */
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45 | 20 | jknichel | ColonetServer::~ColonetServer() { |
46 | } |
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47 | |||
48 | 29 | jknichel | /**
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49 | * @brief Initializes the various elements needed for the server to run
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50 | *
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51 | * @param argc The number of command line arguments passed to the program
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52 | * @param argv The command line arguments passed to the program
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53 | *
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54 | * @return 0 on success, negative error code on failure
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55 | */
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56 | 20 | jknichel | int ColonetServer::initialize_server(int argc, char * argv[]) { |
57 | 426 | emarinel | options_parseCmdLine(argc, argv); |
58 | 20 | jknichel | |
59 | 426 | emarinel | if (optionsG.logging_enabled) {
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60 | logger = new Log("colonet_server_log.txt"); |
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61 | } |
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62 | |||
63 | 27 | jknichel | if (initialize_connection(optionsG.listen_port) < 0) { |
64 | 20 | jknichel | return -1; |
65 | 27 | jknichel | } |
66 | 20 | jknichel | |
67 | 22 | jknichel | if (initialize_wireless() < 0) { |
68 | 20 | jknichel | fprintf(stderr, "%s: initWireless failed\n", __FUNCTION__);
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69 | 939 | rcahoon | //TODO: Can we continue safely without wireless?
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70 | //return -1;
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71 | 20 | jknichel | } |
72 | |||
73 | return 0; |
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74 | } |
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75 | |||
76 | 29 | jknichel | /**
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77 | * @brief Starts the server listening on the socket that was opened for listening
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78 | *
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79 | * @return 0 on success, negative error code on failure
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80 | */
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81 | 25 | jknichel | int ColonetServer::start_listening() {
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82 | if (listen(listen_socket, LISTEN_BACKLOG) < 0) { |
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83 | 426 | emarinel | if (optionsG.logging_enabled) {
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84 | logger->log_error("\t\nThere was an error telling the socket to listen for connections from clients. "
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85 | "Terminating Server...\n");
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86 | } |
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87 | 25 | jknichel | return -1; |
88 | } |
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89 | 433 | emarinel | |
90 | 25 | jknichel | return 0; |
91 | } |
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92 | 22 | jknichel | |
93 | 618 | jknichel | /**
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94 | * @brief The function that is run in the new pthread in order to do the position monitoring
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95 | *
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96 | * @param arg the argument to give to the new thread
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97 | */
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98 | 938 | rcahoon | void* loop_position_monitor(void* arg) { |
99 | 508 | emarinel | PositionMonitor* p = (PositionMonitor*) arg; |
100 | p->run(); |
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101 | return NULL; |
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102 | } |
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103 | |||
104 | 618 | jknichel | /**
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105 | * @brief This function spawns a new thread to do the position monitoring based off data
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106 | * retrieved from the library that parses the image from the camera
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107 | */
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108 | 508 | emarinel | int ColonetServer::run_position_monitor() {
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109 | pthread_t posmon_thread; |
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110 | 938 | rcahoon | pthread_create(&posmon_thread, NULL, loop_position_monitor, &position_monitor);
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111 | 508 | emarinel | |
112 | return 0; |
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113 | } |
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114 | |||
115 | 939 | rcahoon | /**
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116 | * @brief The function that is run in the new pthread in order to do the client processing
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117 | */
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118 | 938 | rcahoon | void ColonetServer::loop_server() {
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119 | 618 | jknichel | //add the socket that you will listen to connections on to the connection pool
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120 | 453 | emarinel | connection_pool->add_new_socket_to_pool(listen_socket); |
121 | 20 | jknichel | |
122 | 143 | jknichel | int accept_socket = 0; |
123 | struct sockaddr_in client_addr;
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124 | socklen_t client_addr_size = sizeof(client_addr);
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125 | 20 | jknichel | |
126 | 426 | emarinel | if (optionsG.logging_enabled) {
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127 | logger->log_message("Server initialized. About to start listening for connections");
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128 | } |
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129 | 11 | emarinel | |
130 | 143 | jknichel | while(1) { |
131 | 618 | jknichel | //sleep for a little bit so this program doesn't hog cpu
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132 | 469 | emarinel | usleep(10000);
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133 | |||
134 | 618 | jknichel | //tell the connection pool to look at the file descriptors and see which ones are ready
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135 | 453 | emarinel | connection_pool->perform_select(listen_socket); |
136 | 409 | emarinel | |
137 | 143 | jknichel | //either no descriptors are ready or there was an error
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138 | 453 | emarinel | if (connection_pool->get_number_clients_ready() <= 0) { |
139 | 143 | jknichel | continue;
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140 | } |
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141 | 11 | emarinel | |
142 | 618 | jknichel | //check to see if a new client is trying to connect
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143 | 453 | emarinel | if (connection_pool->is_socket_ready_to_read(listen_socket)) {
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144 | 143 | jknichel | printf("Something is trying to connect...\n");
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145 | 618 | jknichel | //accept the connection
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146 | 143 | jknichel | if ((accept_socket = accept(listen_socket, (struct sockaddr*) &client_addr, &client_addr_size)) < 0) { |
147 | 424 | emarinel | if (errno == EMFILE) {
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148 | printf("\tWhen attempting to accept a connection, reached the per process limit of file descriptors."
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149 | 618 | jknichel | " Dropping the new connection.\n");
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150 | 424 | emarinel | continue;
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151 | } else {
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152 | printf("\tThere was an error when attempting to accept a connection");
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153 | } |
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154 | continue;
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155 | 11 | emarinel | } |
156 | |||
157 | 426 | emarinel | if (optionsG.logging_enabled) {
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158 | 433 | emarinel | char log_buffer[LOG_BUFFER_LENGTH];
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159 | snprintf(log_buffer, LOG_BUFFER_LENGTH, "Client at address %s attempting to connect.",
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160 | 648 | emarinel | inet_ntoa(client_addr.sin_addr)); |
161 | 433 | emarinel | logger->log_string(LOG_TYPE_CONNECT, log_buffer); |
162 | 426 | emarinel | } |
163 | 11 | emarinel | |
164 | 618 | jknichel | //add the new client to the connection pool
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165 | 453 | emarinel | if (connection_pool->add_client(accept_socket) < 0) { |
166 | 424 | emarinel | printf("\tThere was an error when trying to add a client to the connection pool.");
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167 | continue;
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168 | 11 | emarinel | } |
169 | |||
170 | 426 | emarinel | if (optionsG.logging_enabled) {
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171 | 433 | emarinel | char log_buffer[LOG_BUFFER_LENGTH];
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172 | 426 | emarinel | snprintf(log_buffer, LOG_BUFFER_LENGTH, "Client at address %s successfully added to connection pool.",
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173 | inet_ntoa(client_addr.sin_addr)); |
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174 | logger->log_string(LOG_TYPE_CONNECT, log_buffer); |
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175 | } |
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176 | 11 | emarinel | } |
177 | 143 | jknichel | |
178 | 618 | jknichel | //check all the clients in the connection pool
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179 | 453 | emarinel | if (connection_pool->check_clients() < 0) { |
180 | 143 | jknichel | printf("\tThere was an error trying to update the clients.");
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181 | } |
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182 | 11 | emarinel | } |
183 | 938 | rcahoon | } |
184 | 11 | emarinel | |
185 | 939 | rcahoon | /**
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186 | * @brief Launchpad function to start loop_server() since callbacks don't support member functions
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187 | *
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188 | * @param arg the argument to give to the new thread
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189 | */
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190 | 938 | rcahoon | void * launch_loop_server(void *arg) { |
191 | ColonetServer *object = (ColonetServer*) arg; |
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192 | object->loop_server(); |
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193 | |||
194 | return NULL; |
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195 | } |
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196 | |||
197 | /**
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198 | * @brief Starts the server running (starts an infinite loop)
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199 | */
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200 | int ColonetServer::run_server() {
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201 | pthread_t server_thread; |
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202 | pthread_create(&server_thread, NULL, launch_loop_server, this); |
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203 | |||
204 | 20 | jknichel | return 0; |
205 | 11 | emarinel | } |
206 | 20 | jknichel | |
207 | 939 | rcahoon | /**
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208 | * @brief Main loop of the server, runs periodic tasks
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209 | *
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210 | * @return 0 on success, negative error code on failure
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211 | */
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212 | 938 | rcahoon | int ColonetServer::run_loop() {
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213 | |||
214 | int refresh_virtual_wall_count = 0; |
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215 | |||
216 | while(1) { |
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217 | //sleep for a little bit so this program doesn't hog cpu
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218 | usleep(10000);
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219 | |||
220 | /* Refresh virtual wall. */
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221 | if (refresh_virtual_wall_count++ == REFRESH_VIRTUAL_WALL_PERIOD) {
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222 | fprintf(stderr, "Sending virtual wall info to robots.\n");
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223 | refresh_virtual_wall_count = 0;
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224 | virtual_wall.send_to_robots(); |
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225 | } |
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226 | } |
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227 | |||
228 | return 0; |
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229 | } |
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230 | |||
231 | 424 | emarinel | /**
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232 | 618 | jknichel | * @brief when the server receives a new wireless message, it calls this function to process it
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233 | *
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234 | * @param source - ID of robot that message is from.
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235 | * @param dest - ID of internet client to send message to.
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236 | * @param data - Data to send to internet client.
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237 | * @param len - Length of the data param.
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238 | */
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239 | 424 | emarinel | int ColonetServer::process_received_wireless_message(int dest, char* data, int len) { |
240 | 618 | jknichel | //try to pass the robot's response onto the client it wanted to respond to
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241 | 453 | emarinel | if (connection_pool->write_to_client(dest, data, len) == ERROR_INVALID_CLIENT_ID) {
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242 | 424 | emarinel | printf("The robot wanted to pass the data to a client not in the pool.\n");
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243 | 140 | jknichel | return -1; |
244 | } |
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245 | 574 | gtress | printf("Processing data from robot: %s\n", data);
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246 | 140 | jknichel | return 0; |
247 | 20 | jknichel | } |
248 | 22 | jknichel | |
249 | 29 | jknichel | /**
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250 | * @brief Initializes the wireless
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251 | *
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252 | * @return 0 on success, negative error code on error
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253 | */
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254 | 27 | jknichel | int ColonetServer::initialize_wireless() {
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255 | 23 | jknichel | char* log_filename = NULL; |
256 | 22 | jknichel | |
257 | 23 | jknichel | if (optionsG.logging_enabled) {
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258 | 348 | emarinel | printf("Logging enabled. Log filename: %s\n", optionsG.log_filename);
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259 | 23 | jknichel | log_filename = optionsG.log_filename; |
260 | 347 | emarinel | } else {
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261 | printf("Logging disabled.\n");
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262 | 23 | jknichel | } |
263 | |||
264 | 618 | jknichel | //initialize the wireless library giving it the port and the log file name
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265 | 424 | emarinel | if (colonet_wl_init(optionsG.wireless_port, log_filename) != 0) { |
266 | 397 | emarinel | fprintf(stderr, "ERROR - colonet_wl_init failed.\n");
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267 | return -1; |
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268 | } |
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269 | 347 | emarinel | |
270 | 618 | jknichel | //call the function that will start the thread that will listen for wireless messages
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271 | 164 | emarinel | if (colonet_wl_run_listener_thread()) {
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272 | 348 | emarinel | fprintf(stderr, "%s: colonet_wl_run_listener_thread failed.\n", __FUNCTION__);
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273 | 34 | emarinel | return -1; |
274 | 161 | emarinel | } |
275 | 23 | jknichel | |
276 | 34 | emarinel | return 0; |
277 | 23 | jknichel | } |
278 | |||
279 | 29 | jknichel | /**
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280 | * @brief Initialize a connection to listen on
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281 | *
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282 | * @port The port to try to open to listen on
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283 | *
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284 | * @return 0 on success, negative error code on error
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285 | */
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286 | 27 | jknichel | int ColonetServer::initialize_connection(int port) { |
287 | 348 | emarinel | printf("Initializing connection that will be used to listen for clients...\n");
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288 | 27 | jknichel | int options = 1; |
289 | struct sockaddr_in my_address;
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290 | 23 | jknichel | |
291 | //get a socket fd
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292 | 24 | jknichel | if ((listen_socket = socket(AF_INET, SOCK_STREAM, 0)) < 0) { |
293 | 408 | emarinel | printf("\tThere was an error creating socket\n");
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294 | 23 | jknichel | return -1; |
295 | } |
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296 | |||
297 | //set up the address struct
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298 | 27 | jknichel | memset(&my_address,'\0',sizeof(my_address)); |
299 | my_address.sin_family = AF_INET; |
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300 | my_address.sin_addr.s_addr = htonl(INADDR_ANY); |
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301 | my_address.sin_port = htons(port); |
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302 | 161 | emarinel | |
303 | 27 | jknichel | setsockopt(listen_socket, SOL_SOCKET, SO_REUSEADDR, &options, sizeof(options));
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304 | 23 | jknichel | |
305 | //get the current socket options
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306 | 27 | jknichel | if ((options = fcntl(listen_socket, F_GETFL)) < 0) { |
307 | 23 | jknichel | printf("\tThere was an error getting the socket options.\n");
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308 | return -1; |
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309 | } |
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310 | |||
311 | //set the socket to non blocking
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312 | 27 | jknichel | options = (options | O_NONBLOCK); |
313 | if (fcntl(listen_socket, F_SETFL, options) < 0) { |
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314 | 23 | jknichel | printf("\tThere was an error setting the socket to be non blocking.\n");
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315 | return -1; |
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316 | } |
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317 | 161 | emarinel | |
318 | 23 | jknichel | //bind the socket to listen on the specified port
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319 | 27 | jknichel | if (bind(listen_socket, (struct sockaddr *) &my_address, sizeof(my_address)) < 0) { |
320 | 23 | jknichel | printf("\tThere was an error binding the socket\n");
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321 | return -1; |
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322 | } |
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323 | 161 | emarinel | |
324 | 23 | jknichel | return 0; |
325 | } |
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326 | 443 | emarinel | |
327 | 618 | jknichel | /**
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328 | * @brief returns the position monitor
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329 | */
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330 | 444 | emarinel | PositionMonitor* ColonetServer::getPositionMonitor() { |
331 | return &position_monitor;
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332 | 443 | emarinel | } |
333 | 659 | jknichel | |
334 | VirtualWall* ColonetServer::getVirtualWall() { |
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335 | return &virtual_wall;
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336 | } |