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