server/control.c

   1 /**
   2  * @file control.c
   3  * @brief Handles all client control requests (admin/actuator related)
   4  */
   5 #include "common.h"
   6 #include "control.h"
   7
   8
   9 /**
  10  * Handles control of the actuators.
  11  *
  12 void ActuatorHandler(FCGIContext *context, ActuatorId id, const char *set_value) {
  13         char *ptr;
  14
  15         switch(id) { //Add new actuators here
  16                 case ACT_PRESSURE: //Suppose is pressure regulator. 0-700 input (kPa)
  17                 {
  18                         int value = strtol(set_value, &ptr, 10);
  19                         if (*ptr == '\0' && value >= 0 && value <= 700) {
  20                                 FCGI_BeginJSON(context, STATUS_OK);
  21                                 FCGI_JSONKey("description");
  22                                 FCGI_JSONValue("\"Set pressure to %d kPa!\"", value);
  23                                 FCGI_EndJSON();
  24                         } else {
  25                                 FCGI_RejectJSONEx(context,
  26                                         STATUS_ERROR, "Invalid pressure specified.");
  27                         }
  28                 } break;
  29                 case ACT_SOLENOID1:
  30                 {
  31                         int value = strtol(set_value, &ptr, 10);
  32                         if (*ptr == '\0') {
  33                                 const char *state = "off";
  34                                 if (value)
  35                                         state = "on";
  36                                 FCGI_BeginJSON(context, STATUS_OK);
  37                                 FCGI_JSONKey("description");
  38                                 FCGI_JSONValue("\"Solenoid 1 turned %s!\"", state);
  39                                 FCGI_EndJSON();
  40                         } else {
  41                                 FCGI_RejectJSON(context, "Invalid actuator value specified");
  42                         }
  43                 } break;
  44                 default:
  45                         FCGI_RejectJSONEx(context,
  46                                 STATUS_ERROR, "Invalid actuator id specified.");
  47         }
  48 }
  49 */
  50
  51 /**
  52  * System control handler. This covers control over all aspects of the system.
  53  * E.g: Actuators, system commands (start/stop experiment/recording) etc
  54  * @param context The context to work in
  55  * @param params The input parameters
  56  */
  57 void Control_Handler(FCGIContext *context, char *params) {
  58         const char *key, *value, *control_key = NULL;
  59         const char *action = NULL, *set_value = NULL;
  60         bool force = false;
  61         char *ptr;
  62         int id = -1;
  63
  64         while ((params = FCGI_KeyPair(params, &key, &value))) {
  65                 if (!strcmp(key, "action"))
  66                         action = value;
  67                 else if (!strcmp(key, "key"))
  68                         control_key = value;
  69                 else if (!strcmp(key, "force"))
  70                         force = !force;
  71                 else if (!strcmp(key, "id") && *value) { //Ensure non-empty value
  72                         int parsed = strtol(value, &ptr, 10);
  73                         if (*ptr == '\0') {
  74                                 id = parsed;
  75                         }
  76                 } else if (!strcmp(key, "value")) {
  77                         set_value = value;
  78                 }
  79         }
  80         Log(LOGDEBUG, "Id %d", id); // to stop compiler complaining for now
  81
  82         if (action == NULL) { //Must have an action
  83                 FCGI_RejectJSON(context, "No action specified");
  84         } else if (!strcmp(action, "start")) {
  85                 FCGI_BeginControl(context, force);
  86         } else if (!strcmp(action, "stop")) { //Don't require control key to stop...
  87                 //EMERGENCY STOP!! TODO - replace!
  88                 FCGI_BeginJSON(context, STATUS_OK);
  89                 FCGI_JSONPair("description", "stopped! (not)");
  90                 FCGI_EndJSON();
  91         } else { //Under this section, the user must have the current control key.
  92                 if (!FCGI_HasControl(context, control_key)) {
  93                         FCGI_RejectJSONEx(context,
  94                                 STATUS_UNAUTHORIZED, "Invalid control key specified.");
  95                 } else if (!strcmp(action, "end")) {
  96                         FCGI_EndControl(context);
  97                 } else if (!strcmp(action, "set")) {
  98                         if (set_value == NULL || *set_value == '\0') {
  99                                 FCGI_RejectJSONEx(context,
 100                                         STATUS_ERROR, "Set called but no value specified.");
 101                         } else
 102                         {
 103 //                              ActuatorHandler(context, id, set_value);
 104                         }
 105                 }
 106         }
 107 }