* @brief Handles all client control requests (admin related)
*/
#include "common.h"
+#include "options.h"
#include "control.h"
#include "sensor.h"
#include "actuator.h"
-
-typedef enum ControlState {
- STATE_STOPPED,
- STATE_PAUSED,
- STATE_RUNNING
-} ControlState;
+#include <dirent.h>
typedef struct ControlData {
- ControlState state;
+ ControlModes current_mode;
pthread_mutex_t mutex;
struct timeval start_time;
+ char user_name[31]; // The user who owns the currently running experiment
} ControlData;
-ControlData g_controls = {STATE_STOPPED, PTHREAD_MUTEX_INITIALIZER, {0}};
+ControlData g_controls = {CONTROL_STOP, PTHREAD_MUTEX_INITIALIZER, {0}};
+
+bool PathExists(const char *path)
+{
+ FILE *fp = fopen(path, "r");
+ if (fp) {
+ fclose(fp);
+ return true;
+ }
+ return false;
+}
/**
* System control handler. This covers high-level control, including
* @param params The input parameters
*/
void Control_Handler(FCGIContext *context, char *params) {
- const char *action, *key = "", *name = "";
+ const char *action = "";
+ const char *name = "";
bool force = false;
+ ControlModes desired_mode;
+
+
+
+
- FCGIValue values[4] = {
+ // Login/auth now handled entirely in fastcgi.c and login.c
+ //TODO: Need to not have the ability for any user to stop someone else' experiment...
+ // (achieve by storing the username of the person running the current experiment, even when they log out?)
+ // (Our program should only realisitically support a single experiment at a time, so that should be sufficient)
+ FCGIValue values[3] = {
{"action", &action, FCGI_REQUIRED(FCGI_STRING_T)},
- {"key", &key, FCGI_STRING_T},
{"force", &force, FCGI_BOOL_T},
{"name", &name, FCGI_STRING_T}
};
- if (!FCGI_ParseRequest(context, params, values, 4))
+
+ if (!FCGI_ParseRequest(context, params, values, 3))
return;
-
- if (!strcmp(action, "lock")) {
- FCGI_LockControl(context, force);
- } else if (FCGI_HasControl(context, key)) {
- if (!strcmp(action, "release")) {
- FCGI_ReleaseControl(context);
- } else if (!strcmp(action, "start")) {
- FCGI_BeginJSON(context, STATUS_OK);
- FCGI_JSONPair("description", "start");
- FCGI_EndJSON();
- } else if (!strcmp(action, "pause")) {
- FCGI_BeginJSON(context, STATUS_OK);
- FCGI_JSONPair("description", "stop");
- FCGI_EndJSON();
- } else if (!strcmp(action, "end")) {
- FCGI_BeginJSON(context, STATUS_OK);
- FCGI_JSONPair("description", "stop");
- FCGI_EndJSON();
- } else {
- FCGI_RejectJSON(context, "Unknown action specified.");
+
+ //HACKETY HACK HACK (should really be a seperate function)
+ if (strcmp(action, "list") == 0)
+ {
+ DIR * dir = opendir(context->user_name);
+ if (dir == NULL)
+ {
+ FCGI_RejectJSON(context, "Failed to open user directory");
+ return;
}
+ struct dirent * ent;
+ FCGI_BeginJSON(context, STATUS_OK);
+ FCGI_JSONKey("experiments");
+ FCGI_PrintRaw("[");
+
+ bool first = true;
+ while ((ent = readdir(dir)) != NULL)
+ {
+ char * c;
+ for (c = ent->d_name; *c != '\0' && *c != '.'; ++c);
+
+ if (*c != '\0' && strcmp(c, ".exp") == 0)
+ {
+ if (!first)
+ FCGI_PrintRaw(",");
+ *c = '\0'; // Ummm... probably not a great idea
+ FCGI_PrintRaw(ent->d_name);
+ first = false;
+ }
+ }
+ FCGI_PrintRaw("]");
+ FCGI_EndJSON();
+
+ return; // Dear god this is terrible
+ }
+ //TODO: Need a "load" action to set data files (but not run) from a past experiment
+
+ //TODO: Need a "delete" action so that people can overwrite experiments (without all this "force" shenanigans)
+
+ if (!strcmp(action, "emergency")) {
+ desired_mode = CONTROL_EMERGENCY;
+ } else if (!strcmp(action, "start")) {
+ desired_mode = CONTROL_START;
+ } else if (!strcmp(action, "pause")) {
+ desired_mode = CONTROL_PAUSE;
+ } else if (!strcmp(action, "resume")) {
+ desired_mode = CONTROL_RESUME;
+ } else if (!strcmp(action, "stop")) {
+ desired_mode = CONTROL_STOP;
} else {
- FCGI_RejectJSONEx(context, STATUS_UNAUTHORIZED,
- "Invalid control key specified.");
+ FCGI_RejectJSON(context, "Unknown action specified.");
+ return;
+ }
+
+ if (*g_controls.user_name != '\0' && strcmp(g_controls.user_name,context->user_name) != 0)
+ {
+ if (context->user_type != USER_ADMIN)
+ {
+ FCGI_RejectJSON(context, "Another user has an experiment in progress.");
+ return;
+ }
+
+ if (!force)
+ {
+ Log(LOGERR, "User %s is currently running an experiment!", g_controls.user_name);
+ FCGI_RejectJSON(context, "Pass \"force\" to take control over another user's experiment");
+ return;
+ }
}
-}
-bool Control_Start(const char *experiment_name) {
- bool ret = false;
+
+
+ //HACK
+ chdir(context->user_name);
- pthread_mutex_lock(&(g_controls.mutex));
- if (g_controls.state == STATE_STOPPED) {
- gettimeofday(&(g_controls.start_time), NULL);
- Sensor_StartAll(experiment_name);
- Actuator_StartAll(experiment_name);
- g_controls.state = STATE_RUNNING;
- ret = true;
+ void *arg = NULL;
+ if (desired_mode == CONTROL_START) {
+ if (PathExists(name) && !force) {
+ FCGI_RejectJSON(context, "An experiment with that name already exists.");
+ chdir(g_options.root_dir); // REVERSE HACK
+ return;
+ }
+ char * c = (char*)name;
+ for (c = (char*)name; *c != '\0' && *c != '.'; ++c);
+ if (*c == '.')
+ {
+ FCGI_RejectJSON(context, "Can't include '.' characters in experiment names (at this point we don't care anymore, go find someone who does).");
+ chdir(g_options.root_dir); // REVERSE HACK
+ return;
+ }
+ arg = (void*)name;
}
- pthread_mutex_unlock(&(g_controls.mutex));
- return ret;
-}
+
-void Control_Pause() {
- pthread_mutex_lock(&(g_controls.mutex));
- pthread_mutex_unlock(&(g_controls.mutex));
+ const char *ret;
+ if ((ret = Control_SetMode(desired_mode, arg)) != NULL)
+ {
+ FCGI_RejectJSON(context, ret);
+ }
+ else
+ {
+ if (desired_mode == CONTROL_STOP)
+ g_controls.user_name[0] = '\0';
+ else
+ {
+ snprintf(g_controls.user_name, sizeof(g_controls.user_name), context->user_name);
+ }
+ FCGI_BeginJSON(context, STATUS_OK);
+ FCGI_JSONPair("description", "ok");
+ FCGI_EndJSON();
+ }
+
+ //REVERSE HACK
+ chdir(g_options.root_dir);
}
-bool Control_Stop() {
- bool ret = false;
+/**
+ * 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;
pthread_mutex_lock(&(g_controls.mutex));
- if (g_controls.state != STATE_STOPPED) {
- Actuator_StopAll();
- Sensor_StopAll();
- g_controls.state = STATE_STOPPED;
- 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;
+ }
+
+ 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));
+ pthread_mutex_unlock(&(g_controls.mutex));
return ret;
}
-bool Control_Lock() {
- pthread_mutex_lock(&(g_controls.mutex));
- if (g_controls.state == STATE_RUNNING)
- return true;
- pthread_mutex_unlock(&(g_controls.mutex));
- return false;
-}
+/**
+ * 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";
-void Control_Unlock() {
- pthread_mutex_unlock(&(g_controls.mutex));
+ 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;
+ }
+ return ret;
}
+/**
+ * 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
+}