src/server/itemdb.c

   1 /*
   2  * OpenDispense 2
   3  * UCC (University [of WA] Computer Club) Electronic Accounting System
   4  *
   5  * itemdb.c - Dispense Item Databse
   6  *
   7  * This file is licenced under the 3-clause BSD Licence. See the file COPYING
   8  * for full details.
   9  */
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include <ctype.h>
  14 #include "common.h"
  15 #include <regex.h>
  16 #include <sys/stat.h>
  17 #include <time.h>
  18
  19 // === IMPORTS ===
  20 extern tHandler gCoke_Handler;
  21 extern tHandler gSnack_Handler;
  22 extern tHandler gDoor_Handler;
  23
  24 // === PROTOTYPES ===
  25 void    Init_Handlers(void);
  26 void    Load_Itemlist(void);
  27 void    Items_ReadFromFile(void);
  28 char    *trim(char *__str);
  29
  30 // === GLOBALS ===
  31  int    giNumItems = 0;
  32 tItem   *gaItems = NULL;
  33 time_t  gItems_LastUpdated;
  34 tHandler        gPseudo_Handler = {Name:"pseudo"};
  35 tHandler        *gaHandlers[] = {&gPseudo_Handler, &gCoke_Handler, &gSnack_Handler, &gDoor_Handler};
  36  int    giNumHandlers = sizeof(gaHandlers)/sizeof(gaHandlers[0]);
  37 char    *gsItemListFile = DEFAULT_ITEM_FILE;
  38 #if USE_INOTIFY
  39  int    giItem_INotifyFD;
  40 #endif
  41 regex_t gItemFile_Regex;
  42
  43 // === CODE ===
  44 void Init_Handlers()
  45 {
  46          int    i;
  47         for( i = 0; i < giNumHandlers; i ++ )
  48         {
  49                 if( gaHandlers[i]->Init )
  50                         gaHandlers[i]->Init(0, NULL);   // TODO: Arguments
  51         }
  52
  53         // Use inotify to watch the snack config file
  54         #if USE_INOTIFY
  55         {
  56                 int oflags;
  57
  58                 giItem_INotifyFD = inotify_init();
  59                 inotify_add_watch(giItem_INotifyFD, gsItemListFile, IN_MODIFY);
  60
  61                 // Handle SIGIO
  62                 signal(SIGIO, &ItemList_Changed);
  63
  64                 // Fire SIGIO when data is ready on the FD
  65                 fcntl(giItem_INotifyFD, F_SETOWN, getpid());
  66                 oflags = fcntl(giItem_INotifyFD, F_GETFL);
  67                 fcntl(giItem_INotifyFD, F_SETFL, oflags | FASYNC);
  68         }
  69         #endif
  70 }
  71
  72 #if USE_INOTIFY
  73 void ItemList_Changed(int signum)
  74 {
  75         char    buf[512];
  76         read(giItem_INotifyFD, buf, 512);
  77         Load_Itemlist();
  78
  79         signum = 0;     // Shut up GCC
  80 }
  81 #endif
  82
  83 /**
  84  * \brief Read the initiali item list
  85  */
  86 void Load_Itemlist(void)
  87 {
  88          int    rv;
  89         rv = regcomp(&gItemFile_Regex, "^-?([a-zA-Z][a-zA-Z]*)\\s+([0-9]+)\\s+([0-9]+)\\s+(.*)", REG_EXTENDED);
  90         if( rv )
  91         {
  92                 size_t  len = regerror(rv, &gItemFile_Regex, NULL, 0);
  93                 char    errorStr[len];
  94                 regerror(rv, &gItemFile_Regex, errorStr, len);
  95                 fprintf(stderr, "Rexex compilation failed - %s\n", errorStr);
  96                 exit(-1);
  97         }
  98
  99         Items_ReadFromFile();
 100
 101         // Re-read the item file periodically
 102         // TODO: Be less lazy here and check the timestamp
 103         AddPeriodicFunction( Items_ReadFromFile );
 104 }
 105
 106 /**
 107  * \brief Read the item list from disk
 108  */
 109 void Items_ReadFromFile(void)
 110 {
 111         FILE    *fp;
 112         char    buffer[BUFSIZ];
 113         char    *line;
 114          int    lineNum = 0;
 115          int    i, numItems = 0;
 116         tItem   *items = NULL;
 117         regmatch_t      matches[5];
 118
 119         if( gItems_LastUpdated )
 120         {
 121                 struct stat buf;
 122                 if( stat(gsItemListFile, &buf) ) {
 123                         fprintf(stderr, "Unable to stat() item file '%s'\n", gsItemListFile);
 124                         return ;
 125                 }
 126
 127                 // Check if the update is needed
 128                 if( gItems_LastUpdated > buf.st_mtime )
 129                         return ;
 130         }
 131
 132         // Error check
 133         fp = fopen(gsItemListFile, "r");
 134         if(!fp) {
 135                 fprintf(stderr, "Unable to open item file '%s'\n", gsItemListFile);
 136                 perror("Unable to open item file");
 137                 return ;
 138         }
 139
 140         while( fgets(buffer, BUFSIZ, fp) )
 141         {
 142                 char    *tmp;
 143                 char    *type, *desc;
 144                  int    num, price;
 145                 tHandler        *handler;
 146
 147                 lineNum ++;
 148
 149                 // Remove comments
 150                 tmp = strchr(buffer, '#');
 151                 if(tmp) *tmp = '\0';
 152                 tmp = strchr(buffer, ';');
 153                 if(tmp) *tmp = '\0';
 154
 155                 // Trim whitespace
 156                 line = trim(buffer);
 157
 158                 if(strlen(line) == 0)   continue;
 159
 160                 // Pass regex over line
 161                 if( RunRegex( &gItemFile_Regex, line, 5, matches, NULL) ) {
 162                         fprintf(stderr, "Syntax error on line %i of item file '%s'\n", lineNum, gsItemListFile);
 163                         return ;
 164                 }
 165
 166                 // Read line data
 167                 type  = line + matches[1].rm_so;        line[ matches[1].rm_eo ] = '\0';
 168                 num   = atoi( line + matches[2].rm_so );
 169                 price = atoi( line + matches[3].rm_so );
 170                 desc  = line + matches[4].rm_so;
 171
 172                 printf("Item '%s' - %i cents, %s:%i\n", desc, price, type, num);
 173
 174                 handler = NULL;
 175                 for( i = 0; i < giNumHandlers; i ++ )
 176                 {
 177                         if( strcmp(type, gaHandlers[i]->Name) == 0 ) {
 178                                 handler = gaHandlers[i];
 179                                 break;
 180                         }
 181                 }
 182
 183                 if( !handler ) {
 184                         fprintf(stderr, "Unknow item type '%s' on line %i (%s)\n", type, lineNum, desc);
 185                         continue ;
 186                 }
 187
 188                 for( i = 0; i < numItems; i ++ )
 189                 {
 190                         if( items[i].Handler != handler )       continue;
 191                         if( items[i].ID != num )        continue;
 192
 193                         printf("Redefinition of %s:%i, updated\n", handler->Name, num);
 194                         items[i].Price = price;
 195                         free(items[i].Name);
 196                         items[i].Name = strdup(desc);
 197                         break;
 198                 }
 199                 if( i < numItems )      continue;
 200
 201                 items = realloc( items, (numItems + 1)*sizeof(items[0]) );
 202                 items[numItems].Handler = handler;
 203                 items[numItems].ID = num;
 204                 items[numItems].Price = price;
 205                 items[numItems].Name = strdup(desc);
 206                 items[numItems].bHidden = (line[0] == '-');
 207                 numItems ++;
 208         }
 209
 210         // Clean up old
 211         if( giNumItems )
 212         {
 213                 giNumItems = 0;
 214                 free(gaItems);
 215                 gaItems = NULL;
 216         }
 217
 218         // Replace with new
 219         giNumItems = numItems;
 220         gaItems = items;
 221
 222         gItems_LastUpdated = time(NULL);
 223 }
 224
 225 /**
 226  * \brief Update the item file from the internal database
 227  */
 228 void Items_UpdateFile(void)
 229 {
 230         FILE    *fp;
 231         char    buffer[BUFSIZ];
 232         char    *line;
 233          int    lineNum = 0;
 234          int    i;
 235         regmatch_t      matches[5];
 236         char    **line_comments;
 237          int    *line_items;
 238
 239         // Error check
 240         fp = fopen(gsItemListFile, "r");
 241         if(!fp) {
 242                 fprintf(stderr, "Unable to open item file '%s'\n", gsItemListFile);
 243                 perror("Unable to open item file");
 244                 return ;
 245         }
 246
 247         // Count lines
 248         while( fgets(buffer, BUFSIZ, fp) )
 249         {
 250                 lineNum ++;
 251         }
 252
 253         line_comments = malloc(lineNum * sizeof(char*));
 254         line_items = malloc(lineNum * sizeof(int));
 255
 256         // Parse file
 257         lineNum = 0;
 258         fseek(fp, 0, SEEK_SET);
 259         while( fgets(buffer, BUFSIZ, fp) )
 260         {
 261                 char    *hashPos, *semiPos;
 262                 char    *type;
 263                  int    num;
 264                 tHandler        *handler;
 265
 266                 lineNum ++;
 267                 line_items[lineNum-1] = -1;
 268                 line_comments[lineNum-1] = NULL;
 269
 270                 // Get comments
 271                 hashPos = strchr(buffer, '#');
 272                 semiPos = strchr(buffer, ';');
 273                 if( hashPos && semiPos ) {
 274                         if( hashPos < semiPos )
 275                                 line_comments[lineNum-1] = strdup(hashPos);
 276                 }
 277                 else if( hashPos ) {
 278                         line_comments[lineNum-1] = strdup(hashPos);
 279                 }
 280                 else if( semiPos ) {
 281                         line_comments[lineNum-1] = strdup(semiPos);
 282                 }
 283                 if(hashPos)     *hashPos = '\0';
 284                 if(semiPos)     *semiPos = '\0';
 285
 286                 // Trim whitespace
 287                 line = trim(buffer);
 288                 if(strlen(line) == 0)   continue;
 289
 290                 // Pass regex over line
 291                 if( RunRegex( &gItemFile_Regex, line, 5, matches, NULL) ) {
 292                         fprintf(stderr, "Syntax error on line %i of item file '%s'\n", lineNum, gsItemListFile);
 293                         return ;
 294                 }
 295
 296                 // Read line data
 297                 type  = line + matches[1].rm_so;        line[ matches[1].rm_eo ] = '\0';
 298                 num   = atoi( line + matches[2].rm_so );
 299
 300                 // Find handler
 301                 handler = NULL;
 302                 for( i = 0; i < giNumHandlers; i ++ )
 303                 {
 304                         if( strcmp(type, gaHandlers[i]->Name) == 0 ) {
 305                                 handler = gaHandlers[i];
 306                                 break;
 307                         }
 308                 }
 309                 if( !handler ) {
 310                         fprintf(stderr, "Warning: Unknown item type '%s' on line %i\n", type, lineNum);
 311                         continue ;
 312                 }
 313
 314                 for( i = 0; i < giNumItems; i ++ )
 315                 {
 316                         if( gaItems[i].Handler != handler )     continue;
 317                         if( gaItems[i].ID != num )      continue;
 318
 319                         line_items[lineNum-1] = i;
 320                         break;
 321                 }
 322                 if( i >= giNumItems ) {
 323                         continue;
 324                 }
 325         }
 326
 327         fclose(fp);
 328
 329         fp = fopen("items.cfg.new", "w");       // DEBUG: Don't kill the real item file until debugged
 330
 331         // Create new file
 332         {
 333                  int    done_items[giNumItems];
 334                 memset(done_items, 0, sizeof(done_items));
 335
 336                 // Existing items
 337                 for( i = 0; i < lineNum; i ++ )
 338                 {
 339                         if( line_items[i] != -1 ) {
 340                                 tItem   *item = &gaItems[ line_items[i] ];
 341
 342                                 if( done_items[ line_items[i] ] ) {
 343                                         fprintf(fp, "; DUP -");
 344                                 }
 345
 346                                 done_items[ line_items[i] ] = 1;
 347                                 fprintf(fp, "%s\t%i\t%i\t%s\t",
 348                                         item->Handler->Name, item->ID, item->Price, item->Name
 349                                         );
 350                         }
 351
 352                         if( line_comments[i] ) {
 353                                 fprintf(fp, "%s", line_comments[i]);
 354                                 free( line_comments[i] );
 355                         }
 356
 357                         fprintf(fp, "\n");
 358                 }
 359
 360                 // New items
 361                 for( i = 0; i < giNumItems; i ++ )
 362                 {
 363                         tItem   *item = &gaItems[i];
 364                         if( done_items[i] )     continue ;
 365
 366                         fprintf(fp, "%s\t%i\t%i\t%s\n",
 367                                 item->Handler->Name, item->ID, item->Price, item->Name
 368                                 );
 369                 }
 370         }
 371
 372         free( line_comments );
 373         free( line_items );
 374         fclose(fp);
 375 }
 376
 377
 378 char *trim(char *__str)
 379 {
 380         char    *ret;
 381          int    i;
 382
 383         while( isspace(*__str) )
 384                 __str++;
 385         ret = __str;
 386
 387         i = strlen(ret);
 388         while( i-- && isspace(__str[i]) ) {
 389                 __str[i] = '\0';
 390         }
 391
 392         return ret;
 393 }