server/control.c

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