#include "sensor.h"
#include "actuator.h"
-typedef enum ControlState {
- STATE_STOPPED,
- STATE_PAUSED,
- STATE_RUNNING
-} ControlState;
-
-typedef enum Mode {
- START,
- PAUSE,
- RESUME,
- STOP
-} Mode;
-
typedef struct ControlData {
- ControlState state;
+ ControlModes current_mode;
pthread_mutex_t mutex;
struct timeval start_time;
} ControlData;
-ControlData g_controls = {STATE_STOPPED, PTHREAD_MUTEX_INITIALIZER, {0}};
+ControlData g_controls = {CONTROL_STOP, PTHREAD_MUTEX_INITIALIZER, {0}};
-static bool ExperimentExists(const char *experiment_name) {
- FILE *fp = fopen(experiment_name, "r");
- if (!fp)
- return false;
- fclose(fp);
- return true;
+bool PathExists(const char *path)
+{
+ FILE *fp = fopen(path, "r");
+ if (fp) {
+ fclose(fp);
+ return true;
+ }
+ return false;
}
/**
void Control_Handler(FCGIContext *context, char *params) {
const char *action, *key = "", *name = "";
bool force = false;
- Mode mode;
+ ControlModes desired_mode;
FCGIValue values[4] = {
{"action", &action, FCGI_REQUIRED(FCGI_STRING_T)},
if (!strcmp(action, "lock")) {
FCGI_LockControl(context, force);
return;
+ } else if (!strcmp(action, "emergency")) {
+ desired_mode = CONTROL_EMERGENCY;
} else if (FCGI_HasControl(context, key)) {
if (!strcmp(action, "release")) {
FCGI_ReleaseControl(context);
} else if (!strcmp(action, "start")) {
- mode = START;
+ desired_mode = CONTROL_START;
} else if (!strcmp(action, "pause")) {
- mode = PAUSE;
+ desired_mode = CONTROL_PAUSE;
} else if (!strcmp(action, "resume")) {
- mode = RESUME;
+ desired_mode = CONTROL_RESUME;
} else if (!strcmp(action, "stop")) {
- mode = STOP;
+ desired_mode = CONTROL_STOP;
} else {
FCGI_RejectJSON(context, "Unknown action specified.");
return;
return;
}
- switch(mode) {
- case START:
- if (!*name) {
- FCGI_RejectJSON(context, "An experiment name must be provided");
- } else if (ExperimentExists(name) && !force) {
- FCGI_RejectJSONEx(context, STATUS_ALREADYEXISTS,
- "An experiment with the specified name already exists.");
- } else if (!Control_Start(name)) {
- FCGI_RejectJSON(context, "An experiment is already running.");
- } else {
- FCGI_BeginJSON(context, STATUS_OK);
- FCGI_EndJSON();
- }
- break;
- case PAUSE:
- if (!Control_Pause()) {
- FCGI_RejectJSON(context, "No experiment to pause.");
- } else {
- FCGI_BeginJSON(context, STATUS_OK);
- FCGI_EndJSON();
- }
- break;
- case RESUME:
- if (!Control_Resume()) {
- FCGI_RejectJSON(context, "No experiment to resume.");
- } else {
- FCGI_BeginJSON(context, STATUS_OK);
- FCGI_EndJSON();
- }
- break;
- case STOP:
- if (!Control_Stop()) {
- FCGI_RejectJSON(context, "No experiment to stop.");
- } else {
- FCGI_BeginJSON(context, STATUS_OK);
- FCGI_EndJSON();
- }
- break;
- }
-}
+ void *arg = NULL;
+ if (desired_mode == CONTROL_START) {
+ if (PathExists(name) && !force) {
+ FCGI_RejectJSON(context, "An experiment with that name already exists.");
+ return;
+ }
-bool Control_Start(const char *experiment_name) {
- bool ret = false;
+ arg = (void*)name;
+ }
- pthread_mutex_lock(&(g_controls.mutex));
- if (g_controls.state == STATE_STOPPED) {
- FILE *fp = fopen(experiment_name, "a");
- if (fp) {
- fclose(fp);
- gettimeofday(&(g_controls.start_time), NULL);
- Sensor_StartAll(experiment_name);
- Actuator_StartAll(experiment_name);
- g_controls.state = STATE_RUNNING;
- ret = true;
- }
+ const char *ret;
+ if ((ret = Control_SetMode(desired_mode, arg)) != NULL) {
+ FCGI_RejectJSON(context, ret);
+ } else {
+ FCGI_BeginJSON(context, STATUS_OK);
+ FCGI_JSONPair("description", "ok");
+ FCGI_EndJSON();
}
- pthread_mutex_unlock(&(g_controls.mutex));
- return ret;
}
+/**
+ * Sets the mode to the desired mode, if possible.
+ * @param desired_mode The mode to be set to
+ * @param arg An argument specific to the mode to be set.
+ * @return NULL on success, an error message on failure.
+ */
+const char* Control_SetMode(ControlModes desired_mode, void * arg)
+{
+ const char *ret = NULL;
-bool Control_Pause() {
- bool ret = false;
pthread_mutex_lock(&(g_controls.mutex));
- if (g_controls.state == STATE_RUNNING) {
- Actuator_PauseAll();
- Sensor_PauseAll();
- g_controls.state = STATE_PAUSED;
- ret = true;
+ if (g_controls.current_mode == desired_mode)
+ ret = "Already in the desired mode.";
+ else if (g_controls.current_mode == CONTROL_EMERGENCY && desired_mode != CONTROL_STOP)
+ ret = "In emergency mode. You must stop before continuing.";
+ else switch (desired_mode) {
+ case CONTROL_START:
+ if (g_controls.current_mode == CONTROL_STOP) {
+ const char * name = arg;
+ if (!*name)
+ ret = "An experiment name must be specified";
+ else if (strpbrk(name, INVALID_CHARACTERS))
+ ret = "The experiment name must not contain: " INVALID_CHARACTERS_JSON;
+ else {
+ FILE *fp = fopen((const char*) arg, "a");
+ if (fp) {
+ fclose(fp);
+ gettimeofday(&(g_controls.start_time), NULL);
+ } else
+ ret = "Cannot open experiment name marker";
+ }
+ } else
+ ret = "Cannot start when not in a stopped state.";
+ break;
+ case CONTROL_PAUSE:
+ if (g_controls.current_mode != CONTROL_START)
+ ret = "Cannot pause when not in a running state.";
+ break;
+ case CONTROL_RESUME:
+ if (g_controls.current_mode != CONTROL_PAUSE)
+ ret = "Cannot resume when not in a paused state.";
+ break;
+ case CONTROL_EMERGENCY:
+ if (g_controls.current_mode != CONTROL_START) //pfft
+ ret = "Not running so how can there be an emergency.";
+ break;
+ default:
+ break;
}
- pthread_mutex_unlock(&(g_controls.mutex));
- return ret;
-}
-
-bool Control_Resume() {
- bool ret = false;
- pthread_mutex_lock(&(g_controls.mutex));
- if (g_controls.state == STATE_PAUSED) {
- Actuator_ResumeAll();
- Sensor_ResumeAll();
- g_controls.state = STATE_RUNNING;
- ret = true;
+
+ if (ret == NULL) {
+ Actuator_SetModeAll(desired_mode, arg);
+ Sensor_SetModeAll(desired_mode, arg);
+ if (desired_mode != CONTROL_RESUME)
+ g_controls.current_mode = desired_mode;
+ else
+ g_controls.current_mode = CONTROL_START;
}
pthread_mutex_unlock(&(g_controls.mutex));
return ret;
}
-bool Control_Stop() {
- bool ret = false;
-
- pthread_mutex_lock(&(g_controls.mutex));
- if (g_controls.state != STATE_STOPPED) {
- Actuator_StopAll();
- Sensor_StopAll();
- g_controls.state = STATE_STOPPED;
- ret = true;
+/**
+ * Gets a string representation of the current mode
+ * @param mode The mode to get a string representation of
+ * @return The string representation of the mode
+ */
+const char * Control_GetModeName() {
+ const char * ret = "Unknown";
+
+ switch (g_controls.current_mode) {
+ case CONTROL_START: ret = "Running"; break;
+ case CONTROL_PAUSE: ret = "Paused"; break;
+ case CONTROL_RESUME: ret = "Resumed"; break;
+ case CONTROL_STOP: ret = "Stopped"; break;
+ case CONTROL_EMERGENCY: ret = "Emergency mode"; break;
}
- pthread_mutex_unlock(&(g_controls.mutex));
return ret;
}
-bool Control_Lock() {
- pthread_mutex_lock(&(g_controls.mutex));
- if (g_controls.state == STATE_RUNNING || g_controls.state == STATE_PAUSED)
- return true;
- pthread_mutex_unlock(&(g_controls.mutex));
- return false;
-}
-
-void Control_Unlock() {
- pthread_mutex_unlock(&(g_controls.mutex));
-}
-
+/**
+ * Gets the start time for the current experiment
+ * @return the start time
+ */
const struct timeval* Control_GetStartTime() {
return &g_controls.start_time;
-}
\ No newline at end of file
+}