Added periodic thread (reloads item config, checks coke slots)

[tpg/opendispense2.git] / src / server / itemdb.c

diff --git a/src/server/itemdb.c b/src/server/itemdb.c
index e63bb65..e48ab86 100644 (file)
--- a/src/server/itemdb.c
+++ b/src/server/itemdb.c
@@ -13,10 +13,8 @@
 #include <ctype.h>
 #include "common.h"
 #include <regex.h>
-#include <sys/inotify.h>
-#include <signal.h>
-#include <sys/fcntl.h>
-#include <unistd.h>
+#include <sys/stat.h>
+#include <time.h>
 
 // === IMPORTS ===
 extern tHandler        gCoke_Handler;
@@ -25,13 +23,14 @@ extern tHandler     gDoor_Handler;
 
 // === PROTOTYPES ===
 void   Init_Handlers(void);
-void   ItemList_Changed(int signum);
 void   Load_Itemlist(void);
+void   Items_ReadFromFile(void);
 char   *trim(char *__str);
 
 // === GLOBALS ===
  int   giNumItems = 0;
 tItem  *gaItems = NULL;
+time_t gItems_LastUpdated;
 tHandler       gPseudo_Handler = {Name:"pseudo"};
 tHandler       *gaHandlers[] = {&gPseudo_Handler, &gCoke_Handler, &gSnack_Handler, &gDoor_Handler};
  int   giNumHandlers = sizeof(gaHandlers)/sizeof(gaHandlers[0]);
@@ -39,6 +38,7 @@ char  *gsItemListFile = DEFAULT_ITEM_FILE;
 #if USE_INOTIFY
  int   giItem_INotifyFD;
 #endif
+regex_t        gItemFile_Regex;
 
 // === CODE ===
 void Init_Handlers()
@@ -81,30 +81,55 @@ void ItemList_Changed(int signum)
 #endif
 
 /**
- * \brief Read the item list from disk
+ * \brief Read the initiali item list
  */
 void Load_Itemlist(void)
 {
-       FILE    *fp = fopen(gsItemListFile, "r");
+        int    rv;
+       rv = regcomp(&gItemFile_Regex, "^-?([a-zA-Z][a-zA-Z]*)\\s+([0-9]+)\\s+([0-9]+)\\s+(.*)", REG_EXTENDED);
+       if( rv )
+       {
+               size_t  len = regerror(rv, &gItemFile_Regex, NULL, 0);
+               char    errorStr[len];
+               regerror(rv, &gItemFile_Regex, errorStr, len);
+               fprintf(stderr, "Rexex compilation failed - %s\n", errorStr);
+               exit(-1);
+       }
+       
+       Items_ReadFromFile();
+       
+       // Re-read the item file periodically
+       // TODO: Be less lazy here and check the timestamp
+       AddPeriodicFunction( Items_ReadFromFile );
+}
+/**
+ * \brief Read the item list from disk
+ */
+void Items_ReadFromFile(void)
+{
+       FILE    *fp;
        char    buffer[BUFSIZ];
        char    *line;
         int    lineNum = 0;
-        int    i;
-       regex_t regex;
+        int    i, numItems = 0;
+       tItem   *items = NULL;
        regmatch_t      matches[5];
-       
-       i = regcomp(&regex, "^-?([a-zA-Z][a-zA-Z]*)\\s+([0-9]+)\\s+([0-9]+)\\s+(.*)", REG_EXTENDED);
-       if( i )
+
+       if( gItems_LastUpdated ) 
        {
-               size_t  len = regerror(i, &regex, NULL, 0);
-               char    *errorStr = malloc(len);
-               regerror(i, &regex, errorStr, len);
-               fprintf(stderr, "Rexex compilation failed - %s\n", errorStr);
-               free(errorStr);
-               exit(-1);
+               struct stat buf;
+               if( stat(gsItemListFile, &buf) ) {
+                       fprintf(stderr, "Unable to stat() item file '%s'\n", gsItemListFile);
+                       return ;
+               }
+               
+               // Check if the update is needed
+               if( gItems_LastUpdated > buf.st_mtime )
+                       return ;
        }
 
        // Error check
+       fp = fopen(gsItemListFile, "r");
        if(!fp) {
                fprintf(stderr, "Unable to open item file '%s'\n", gsItemListFile);
                perror("Unable to open item file");
@@ -131,13 +156,9 @@ void Load_Itemlist(void)
                if(strlen(line) == 0)   continue;
                
                // Pass regex over line
-               if( (i = regexec(&regex, line, 5, matches, 0)) ) {
-                       size_t  len = regerror(i, &regex, NULL, 0);
-                       char    *errorStr = malloc(len);
-                       regerror(i, &regex, errorStr, len);
-                       fprintf(stderr, "Syntax error on line %i of item file '%s'\n%s", lineNum, gsItemListFile, errorStr);
-                       free(errorStr);
-                       exit(-1);
+               if( RunRegex( &gItemFile_Regex, line, 5, matches, NULL) ) {
+                       fprintf(stderr, "Syntax error on line %i of item file '%s'\n", lineNum, gsItemListFile);
+                       return ;
                }
 
                // Read line data
@@ -162,27 +183,41 @@ void Load_Itemlist(void)
                        continue ;
                }
 
-               for( i = 0; i < giNumItems; i ++ )
+               for( i = 0; i < numItems; i ++ )
                {
-                       if( gaItems[i].Handler != handler )     continue;
-                       if( gaItems[i].ID != num )      continue;
+                       if( items[i].Handler != handler )       continue;
+                       if( items[i].ID != num )        continue;
 
                        printf("Redefinition of %s:%i, updated\n", handler->Name, num);
-                       gaItems[i].Price = price;
-                       free(gaItems[i].Name);
-                       gaItems[i].Name = strdup(desc);
+                       items[i].Price = price;
+                       free(items[i].Name);
+                       items[i].Name = strdup(desc);
                        break;
                }
-               if( i < giNumItems )    continue;
-
-               gaItems = realloc( gaItems, (giNumItems + 1)*sizeof(gaItems[0]) );
-               gaItems[giNumItems].Handler = handler;
-               gaItems[giNumItems].ID = num;
-               gaItems[giNumItems].Price = price;
-               gaItems[giNumItems].Name = strdup(desc);
-               gaItems[giNumItems].bHidden = (line[0] == '-');
-               giNumItems ++;
-       }       
+               if( i < numItems )      continue;
+
+               items = realloc( items, (numItems + 1)*sizeof(items[0]) );
+               items[numItems].Handler = handler;
+               items[numItems].ID = num;
+               items[numItems].Price = price;
+               items[numItems].Name = strdup(desc);
+               items[numItems].bHidden = (line[0] == '-');
+               numItems ++;
+       }
+       
+       // Clean up old
+       if( giNumItems )
+       {
+               giNumItems = 0;
+               free(gaItems);
+               gaItems = NULL;
+       }
+       
+       // Replace with new
+       giNumItems = numItems;
+       gaItems = items;
+       
+       gItems_LastUpdated = time(NULL);
 }
 
 char *trim(char *__str)