X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=server%2Fcontrol.c;h=c6b582384f2f2fe120b7625ddf38cef6fd4d1240;hb=e3e7914fe2f59765e5f92371329652a02518928c;hp=7f5ea34c0509fc59eb1c5b5af96de9387fd12622;hpb=e14a8636e0f9b4f097ee053367776efd977e7c92;p=matches%2FMCTX3420.git

diff --git a/server/control.c b/server/control.c
index 7f5ea34..c6b5823 100644
--- a/server/control.c
+++ b/server/control.c
@@ -1,50 +1,263 @@
+/**
+ * @file control.c
+ * @brief Handles all client control requests (admin related)
+ */
 #include "common.h"
+#include "options.h"
 #include "control.h"
+#include "sensor.h"
+#include "actuator.h"
+#include <dirent.h>
+
+typedef struct ControlData {
+	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 = {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 control over all aspects of the system.
- * E.g: Actuators, system commands (start/stop experiment/recording) etc
+ * System control handler. This covers high-level control, including
+ * admin related functions and starting/stopping experiments..
  * @param context The context to work in
  * @param params The input parameters
  */
 void Control_Handler(FCGIContext *context, char *params) {
-	const char *key, *value, *loginkey = NULL, *action = NULL;
+	const char *action = "";
+	const char *name = "";
 	bool force = false;
+	ControlModes desired_mode;
+	
 	
-	while ((params = FCGI_KeyPair(params, &key, &value))) {
-		if (!strcmp(key, "action"))
-			action = value;
-		else if (!strcmp(key, "key"))
-			loginkey = value;
-		else if (!strcmp(key, "force"))
-			force = !force;
-		else if (!strcmp(key, "id")) {
+	
+
+
+	// 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)},
+		{"force", &force, FCGI_BOOL_T},
+		{"name", &name, FCGI_STRING_T}
+	};
+
+
+	if (!FCGI_ParseRequest(context, params, values, 3))
+		return;
+
+	//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_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;
 		}
-		else if (!strcmp(key, "value")) {
 		
+		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;
 		}
 	}
+
 	
-	if (!strcmp(action, "start")) {
-		FCGI_Authorize(context, force);
-	} else if (!strcmp(action, "stop")) { //Don't require control key to stop...
-		//EMERGENCY STOP!!
-		FCGI_BeginJSON(context, STATUS_OK);
-		FCGI_JSONPair("description", "stopped!"); //Not really
-		FCGI_EndJSON();
-	} else {
-		if (!FCGI_Authorized(context, loginkey)) {
-			FCGI_BeginJSON(context, STATUS_UNAUTHORIZED);
-			FCGI_JSONPair("description", "Invalid key specified.");
-			FCGI_EndJSON();
+	
+	//HACK
+	chdir(context->user_name);
+
+	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;
-		} else if (!strcmp(action, "end")) {
-			FCGI_AuthorizeEnd(context);
-		} else if (!strcmp(action, "set")) {
-			FCGI_BeginJSON(context, STATUS_OK);
-			FCGI_JSONPair("description", "actuated!");
-			FCGI_EndJSON();
 		}
+		arg = (void*)name;
+	}
+
+	
+
+	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);
+}
+
+/**
+ * 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.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));
+	return ret;
+}
+
+/**
+ * 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;
+	}
+	return ret;
+}
+
+/**
+ * Gets the start time for the current experiment
+ * @return the start time
+ */
+const struct timeval* Control_GetStartTime() {
+	return &g_controls.start_time;
 }