src/server/handler_door.c

   1 /*
   2  * OpenDispense 2
   3  * UCC (University [of WA] Computer Club) Electronic Accounting System
   4  *
   5  * handler_door.c - Door Relay code
   6  *
   7  * This file is licenced under the 3-clause BSD Licence. See the file
   8  * COPYING for full details.
   9  */
  10 #define DEBUG   1
  11 #define USE_POPEN       0
  12
  13 #include "common.h"
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include <sys/stat.h>
  18 #include <fcntl.h>
  19 #include <signal.h>
  20 #include <unistd.h>
  21 #include <pty.h>
  22 #include <pthread.h>
  23 #include <semaphore.h>
  24 #include <errno.h>
  25
  26 #define DOOR_UNLOCKED_DELAY     10      // Time in seconds before the door re-locks
  27
  28 // === IMPORTS ===
  29
  30 // === PROTOTYPES ===
  31 void*   Door_Lock(void* Unused);
  32  int    Door_InitHandler();
  33  int    Door_CanDispense(int User, int Item);
  34  int    Door_DoDispense(int User, int Item);
  35
  36 // === GLOBALS ===
  37 tHandler        gDoor_Handler = {
  38         "door",
  39         Door_InitHandler,
  40         Door_CanDispense,
  41         Door_DoDispense
  42 };
  43 char    *gsDoor_SerialPort;     // Set from config in main.c
  44 sem_t   gDoor_UnlockSemaphore;
  45 pthread_t       gDoor_LockThread;
  46
  47 // === CODE ===
  48 void* Door_Lock(void* Unused __attribute__((unused)))
  49 {
  50         while(1)
  51         {
  52                 sem_wait(&gDoor_UnlockSemaphore);
  53
  54                 int door_serial_handle = InitSerial(gsDoor_SerialPort, 9600);
  55                 if(door_serial_handle < 0)
  56                 {
  57                         fprintf(stderr, "Unable to open door serial '%s'\n", gsDoor_SerialPort);
  58                         perror("Opening door port");
  59                 }
  60
  61                 // Disable local echo
  62                 {
  63                         struct termios  info;
  64                         tcgetattr(door_serial_handle, &info);
  65                         info.c_cflag &= ~CLOCAL;
  66                         tcsetattr(door_serial_handle, TCSANOW, &info);
  67                 }
  68
  69                 if(write(door_serial_handle, "\xff\x01\x01", 3) != 3)   // Relay ON
  70                 {
  71                         fprintf(stderr, "Failed to write Relay ON (unlock) command, errstr: %s", strerror(errno));
  72                 }
  73
  74                 sleep(DOOR_UNLOCKED_DELAY);
  75
  76                 if(write(door_serial_handle, "\xff\x01\x00", 3) != 3)   // Relay OFF
  77                 {
  78                         fprintf(stderr, "Failed to write Relay OFF (lock) command, errstr: %s", strerror(errno));
  79                 }
  80
  81                 close(door_serial_handle);
  82         }
  83 }
  84
  85 int Door_InitHandler(void)
  86 {
  87         // Initialize semaphore, triggers door lock release if semaphore is greater than 0
  88         sem_init(&gDoor_UnlockSemaphore, 0, 0);
  89
  90         pthread_create(&gDoor_LockThread, NULL, &Door_Lock, NULL);
  91
  92         return 0;
  93 }
  94
  95 /**
  96  */
  97 int Door_CanDispense(int User, int Item)
  98 {
  99         #if DEBUG
 100         printf("Door_CanDispense: (User=%i,Item=%i)\n", User, Item);
 101         #endif
 102         // Sanity please
 103         if( Item != 0 ) return -1;
 104
 105         if( !(Bank_GetFlags(User) & USER_FLAG_DOORGROUP) )
 106         {
 107                 #if DEBUG
 108                 printf("Door_CanDispense: User %i not in door\n", User);
 109                 #endif
 110                 return 1;
 111         }
 112
 113         #if DEBUG
 114         printf("Door_CanDispense: User %i can open the door\n", User);
 115         #endif
 116
 117         return 0;
 118 }
 119
 120 /**
 121  * \brief Actually do a dispense from the coke machine
 122  */
 123 int Door_DoDispense(int User, int Item)
 124 {
 125         #if DEBUG
 126         printf("Door_DoDispense: (User=%i,Item=%i)\n", User, Item);
 127         #endif
 128
 129         // Sanity please
 130         if( Item != 0 ) return -1;
 131
 132         // Check if user is in door
 133         if( !(Bank_GetFlags(User) & USER_FLAG_DOORGROUP) )
 134         {
 135                 #if DEBUG
 136                 printf("Door_CanDispense: User %i not in door\n", User);
 137                 #endif
 138                 return 1;
 139         }
 140
 141
 142         if(sem_post(&gDoor_UnlockSemaphore))
 143         {
 144                 perror("Failed to post \"Unlock Door\" semaphore, sem_post returned");
 145                 return -1;
 146         }
 147
 148         #if DEBUG
 149         printf("Door_DoDispense: User %i opened door\n", User);
 150         #endif
 151
 152         return 0;
 153 }