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 #define DUMP_ITEMS      0
  20
  21 // === IMPORTS ===
  22 extern tHandler gCoke_Handler;
  23 extern tHandler gSnack_Handler;
  24 extern tHandler gDoor_Handler;
  25
  26 // === PROTOTYPES ===
  27 void    Init_Handlers(void);
  28 void    Load_Itemlist(void);
  29 void    Items_ReadFromFile(void);
  30 char    *trim(char *__str);
  31
  32 // === GLOBALS ===
  33  int    giNumItems = 0;
  34 tItem   *gaItems = NULL;
  35 time_t  gItems_LastUpdated;
  36 tHandler        gPseudo_Handler = {.Name="pseudo"};
  37 tHandler        *gaHandlers[] = {&gPseudo_Handler, &gCoke_Handler, &gSnack_Handler, &gDoor_Handler};
  38  int    giNumHandlers = sizeof(gaHandlers)/sizeof(gaHandlers[0]);
  39 char    *gsItemListFile = DEFAULT_ITEM_FILE;
  40 #if USE_INOTIFY
  41  int    giItem_INotifyFD;
  42 #endif
  43 regex_t gItemFile_Regex;
  44
  45 // === CODE ===
  46 void Init_Handlers()
  47 {
  48          int    i;
  49         for( i = 0; i < giNumHandlers; i ++ )
  50         {
  51                 if( gaHandlers[i]->Init )
  52                         gaHandlers[i]->Init(0, NULL);   // TODO: Arguments
  53         }
  54
  55         // Use inotify to watch the snack config file
  56         #if USE_INOTIFY
  57         {
  58                 int oflags;
  59
  60                 giItem_INotifyFD = inotify_init();
  61                 inotify_add_watch(giItem_INotifyFD, gsItemListFile, IN_MODIFY);
  62
  63                 // Handle SIGIO
  64                 signal(SIGIO, &ItemList_Changed);
  65
  66                 // Fire SIGIO when data is ready on the FD
  67                 fcntl(giItem_INotifyFD, F_SETOWN, getpid());
  68                 oflags = fcntl(giItem_INotifyFD, F_GETFL);
  69                 fcntl(giItem_INotifyFD, F_SETFL, oflags | FASYNC);
  70         }
  71         #endif
  72 }
  73
  74 #if USE_INOTIFY
  75 void ItemList_Changed(int signum)
  76 {
  77         char    buf[512];
  78         read(giItem_INotifyFD, buf, 512);
  79         Load_Itemlist();
  80
  81         signum = 0;     // Shut up GCC
  82 }
  83 #endif
  84
  85 /**
  86  * \brief Read the initial item list
  87  */
  88 void Load_Itemlist(void)
  89 {
  90          int    rv;
  91         rv = regcomp(&gItemFile_Regex, "^-?([a-zA-Z][a-zA-Z]*)\\s+([0-9]+)\\s+([0-9]+)\\s+(.*)", REG_EXTENDED);
  92         if( rv )
  93         {
  94                 size_t  len = regerror(rv, &gItemFile_Regex, NULL, 0);
  95                 char    errorStr[len];
  96                 regerror(rv, &gItemFile_Regex, errorStr, len);
  97                 fprintf(stderr, "Rexex compilation failed - %s\n", errorStr);
  98                 exit(-1);
  99         }
 100
 101         Items_ReadFromFile();
 102
 103         // Re-read the item file periodically
 104         // TODO: Be less lazy here and check the timestamp
 105         AddPeriodicFunction( Items_ReadFromFile );
 106 }
 107
 108 /**
 109  * \brief Read the item list from disk
 110  */
 111 void Items_ReadFromFile(void)
 112 {
 113         FILE    *fp;
 114         char    buffer[BUFSIZ];
 115         char    *line;
 116          int    lineNum = 0;
 117          int    i, numItems = 0;
 118         tItem   *items = NULL;
 119         regmatch_t      matches[5];
 120
 121         if( gItems_LastUpdated )
 122         {
 123                 struct stat buf;
 124                 if( stat(gsItemListFile, &buf) ) {
 125                         fprintf(stderr, "Unable to stat() item file '%s'\n", gsItemListFile);
 126                         return ;
 127                 }
 128
 129                 // Check if the update is needed
 130                 if( gItems_LastUpdated > buf.st_mtime )
 131                         return ;
 132         }
 133
 134         // Error check
 135         fp = fopen(gsItemListFile, "r");
 136         if(!fp) {
 137                 fprintf(stderr, "Unable to open item file '%s'\n", gsItemListFile);
 138                 perror("Unable to open item file");
 139                 return ;
 140         }
 141
 142         while( fgets(buffer, BUFSIZ, fp) )
 143         {
 144                 char    *tmp;
 145                 char    *type, *desc;
 146                  int    num, price;
 147                 tHandler        *handler;
 148
 149                 lineNum ++;
 150
 151                 // Remove comments
 152                 tmp = strchr(buffer, '#');
 153                 if(tmp) *tmp = '\0';
 154                 tmp = strchr(buffer, ';');
 155                 if(tmp) *tmp = '\0';
 156
 157                 // Trim whitespace
 158                 line = trim(buffer);
 159
 160                 if(strlen(line) == 0)   continue;
 161
 162                 // Pass regex over line
 163                 if( RunRegex( &gItemFile_Regex, line, 5, matches, NULL) ) {
 164                         fprintf(stderr, "Syntax error on line %i of item file '%s'\n", lineNum, gsItemListFile);
 165                         return ;
 166                 }
 167
 168                 // Read line data
 169                 type  = line + matches[1].rm_so;        line[ matches[1].rm_eo ] = '\0';
 170                 num   = atoi( line + matches[2].rm_so );
 171                 price = atoi( line + matches[3].rm_so );
 172                 desc  = line + matches[4].rm_so;
 173
 174                 #if DUMP_ITEMS
 175                 printf("Item '%s' - %i cents, %s:%i\n", desc, price, type, num);
 176                 #endif
 177
 178                 handler = NULL;
 179                 for( i = 0; i < giNumHandlers; i ++ )
 180                 {
 181                         if( strcmp(type, gaHandlers[i]->Name) == 0 ) {
 182                                 handler = gaHandlers[i];
 183                                 break;
 184                         }
 185                 }
 186
 187                 if( !handler ) {
 188                         fprintf(stderr, "Unknow item type '%s' on line %i (%s)\n", type, lineNum, desc);
 189                         continue ;
 190                 }
 191
 192                 for( i = 0; i < numItems; i ++ )
 193                 {
 194                         if( items[i].Handler != handler )       continue;
 195                         if( items[i].ID != num )        continue;
 196
 197                         #if DUMP_ITEMS
 198                         printf("Redefinition of %s:%i, updated\n", handler->Name, num);
 199                         #endif
 200                         items[i].Price = price;
 201                         free(items[i].Name);
 202                         items[i].Name = strdup(desc);
 203                         break;
 204                 }
 205                 if( i < numItems )      continue;
 206
 207                 items = realloc( items, (numItems + 1)*sizeof(items[0]) );
 208                 items[numItems].Handler = handler;
 209                 items[numItems].ID = num;
 210                 items[numItems].Price = price;
 211                 items[numItems].Name = strdup(desc);
 212                 items[numItems].bHidden = (line[0] == '-');
 213                 numItems ++;
 214         }
 215
 216         // Clean up old
 217         if( giNumItems )
 218         {
 219                 giNumItems = 0;
 220                 free(gaItems);
 221                 gaItems = NULL;
 222         }
 223
 224         // Replace with new
 225         giNumItems = numItems;
 226         gaItems = items;
 227
 228         gItems_LastUpdated = time(NULL);
 229 }
 230
 231 /**
 232  * \brief Update the item file from the internal database
 233  */
 234 void Items_UpdateFile(void)
 235 {
 236         FILE    *fp;
 237         char    buffer[BUFSIZ];
 238         char    *line;
 239          int    lineNum = 0;
 240          int    i;
 241         regmatch_t      matches[5];
 242         char    **line_comments;
 243          int    *line_items;
 244
 245         // Error check
 246         fp = fopen(gsItemListFile, "r");
 247         if(!fp) {
 248                 fprintf(stderr, "Unable to open item file '%s'\n", gsItemListFile);
 249                 perror("Unable to open item file");
 250                 return ;
 251         }
 252
 253         // Count lines
 254         while( fgets(buffer, BUFSIZ, fp) )
 255         {
 256                 lineNum ++;
 257         }
 258
 259         line_comments = malloc(lineNum * sizeof(char*));
 260         line_items = malloc(lineNum * sizeof(int));
 261
 262         // Parse file
 263         lineNum = 0;
 264         fseek(fp, 0, SEEK_SET);
 265         while( fgets(buffer, BUFSIZ, fp) )
 266         {
 267                 char    *hashPos, *semiPos;
 268                 char    *type;
 269                  int    num;
 270                 tHandler        *handler;
 271
 272                 trim(buffer);
 273
 274                 lineNum ++;
 275                 line_items[lineNum-1] = -1;
 276                 line_comments[lineNum-1] = NULL;
 277
 278                 // Get comments
 279                 hashPos = strchr(buffer, '#');
 280                 semiPos = strchr(buffer, ';');
 281                 if( hashPos && semiPos ) {
 282                         if( hashPos < semiPos )
 283                                 line_comments[lineNum-1] = strdup(hashPos);
 284                 }
 285                 else if( hashPos ) {
 286                         line_comments[lineNum-1] = strdup(hashPos);
 287                 }
 288                 else if( semiPos ) {
 289                         line_comments[lineNum-1] = strdup(semiPos);
 290                 }
 291                 if(hashPos)     *hashPos = '\0';
 292                 if(semiPos)     *semiPos = '\0';
 293
 294                 // Trim whitespace
 295                 line = trim(buffer);
 296                 if(strlen(line) == 0)   continue;
 297
 298                 // Pass regex over line
 299                 if( RunRegex( &gItemFile_Regex, line, 5, matches, NULL) ) {
 300                         fprintf(stderr, "Syntax error on line %i of item file '%s'\n", lineNum, gsItemListFile);
 301                         return ;
 302                 }
 303
 304                 // Read line data
 305                 type  = line + matches[1].rm_so;        line[ matches[1].rm_eo ] = '\0';
 306                 num   = atoi( line + matches[2].rm_so );
 307
 308                 // Find handler
 309                 handler = NULL;
 310                 for( i = 0; i < giNumHandlers; i ++ )
 311                 {
 312                         if( strcmp(type, gaHandlers[i]->Name) == 0 ) {
 313                                 handler = gaHandlers[i];
 314                                 break;
 315                         }
 316                 }
 317                 if( !handler ) {
 318                         fprintf(stderr, "Warning: Unknown item type '%s' on line %i\n", type, lineNum);
 319                         continue ;
 320                 }
 321
 322                 for( i = 0; i < giNumItems; i ++ )
 323                 {
 324                         if( gaItems[i].Handler != handler )     continue;
 325                         if( gaItems[i].ID != num )      continue;
 326
 327                         line_items[lineNum-1] = i;
 328                         break;
 329                 }
 330                 if( i >= giNumItems ) {
 331                         continue;
 332                 }
 333         }
 334
 335         fclose(fp);
 336
 337         //fp = fopen("items.cfg.new", "w");     // DEBUG: Don't kill the real item file until debugged
 338         fp = fopen(gsItemListFile, "w");
 339
 340         // Create new file
 341         {
 342                  int    done_items[giNumItems];
 343                 memset(done_items, 0, sizeof(done_items));
 344
 345                 // Existing items
 346                 for( i = 0; i < lineNum; i ++ )
 347                 {
 348                         if( line_items[i] != -1 ) {
 349                                 tItem   *item = &gaItems[ line_items[i] ];
 350
 351                                 if( done_items[ line_items[i] ] ) {
 352                                         fprintf(fp, "; DUP -");
 353                                 }
 354                                 done_items[ line_items[i] ] = 1;
 355
 356                                 if( item->bHidden )
 357                                         fprintf(fp, "-");
 358
 359                                 fprintf(fp, "%s\t%i\t%i\t%s\t",
 360                                         item->Handler->Name, item->ID, item->Price, item->Name
 361                                         );
 362                         }
 363
 364                         if( line_comments[i] ) {
 365                                 fprintf(fp, "%s", line_comments[i]);
 366                                 free( line_comments[i] );
 367                         }
 368
 369                         fprintf(fp, "\n");
 370                 }
 371
 372                 // New items
 373                 for( i = 0; i < giNumItems; i ++ )
 374                 {
 375                         tItem   *item = &gaItems[i];
 376                         if( done_items[i] )     continue ;
 377
 378                         if( item->bHidden )
 379                                 fprintf(fp, "-");
 380
 381                         fprintf(fp, "%s\t%i\t%i\t%s\n",
 382                                 item->Handler->Name, item->ID, item->Price, item->Name
 383                                 );
 384                 }
 385         }
 386
 387         free( line_comments );
 388         free( line_items );
 389         fclose(fp);
 390 }
 391
 392
 393 char *trim(char *__str)
 394 {
 395         char    *ret;
 396          int    i;
 397
 398         while( isspace(*__str) )
 399                 __str++;
 400         ret = __str;
 401
 402         i = strlen(ret);
 403         while( i-- && isspace(__str[i]) ) {
 404                 __str[i] = '\0';
 405         }
 406
 407         return ret;
 408 }