api: added new actions for controlling a node

lib/api/CMakeLists.txt

@@ -30,6 +30,7 @@ set(API_SRC
     actions/restart.c
     actions/shutdown.c
     actions/status.c
+    actions/node.c
 )
 
 add_library(api STATIC ${API_SRC})

lib/api/actions/node.c

@@ -0,0 +1,146 @@
+/** The API ressource for start/stop/pause/resume nodes.
+ *
+ * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
+ * @copyright 2017-2018, Institute for Automation of Complex Power Systems, EONERC
+ * @license GNU General Public License (version 3)
+ *
+ * VILLASnode
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *********************************************************************************/
+
+#include <jansson.h>
+
+#include <villas/plugin.h>
+#include <villas/node.h>
+#include <villas/super_node.h>
+#include <villas/utils.h>
+#include <villas/stats.h>
+
+#include <villas/api.h>
+
+enum api_control_action {
+	API_NODE_START,
+	API_NODE_STOP,
+	API_NODE_PAUSE,
+	API_NODE_RESUME,
+	API_NODE_RESTART
+};
+
+static int api_control(enum api_control_action act, struct api_action *r, json_t *args, json_t **resp, struct api_session *s)
+{
+	int ret;
+	json_error_t err;
+	const char *node_str;
+
+	ret = json_unpack_ex(args, &err, 0, "{ s: s }",
+		"node", &node_str
+	);
+	if (ret)
+		return ret;
+
+	struct list *nodes = &s->api->super_node->nodes;
+	struct node *node = list_lookup(nodes, node_str);
+
+	if (!node)
+		return -1;
+
+	switch (act) {
+		case API_NODE_START:
+			return node_start(node);
+
+		case API_NODE_STOP:
+			return node_stop(node);
+
+		case API_NODE_PAUSE:
+			return node_pause(node);
+
+		case API_NODE_RESUME:
+			return node_resume(node);
+
+		case API_NODE_RESTART:
+			return node_restart(node);
+
+		default:
+			return -1;
+	}
+
+	return 0;
+}
+
+static int api_control_start(struct api_action *r, json_t *args, json_t **resp, struct api_session *s)
+{
+	return api_control(API_NODE_START, r, args, resp, s);
+}
+
+static int api_control_stop(struct api_action *r, json_t *args, json_t **resp, struct api_session *s)
+{
+	return api_control(API_NODE_STOP, r, args, resp, s);
+}
+
+static int api_control_pause(struct api_action *r, json_t *args, json_t **resp, struct api_session *s)
+{
+	return api_control(API_NODE_PAUSE, r, args, resp, s);
+}
+
+static int api_control_resume(struct api_action *r, json_t *args, json_t **resp, struct api_session *s)
+{
+	return api_control(API_NODE_RESUME, r, args, resp, s);
+}
+
+static int api_control_restart(struct api_action *r, json_t *args, json_t **resp, struct api_session *s)
+{
+	return api_control(API_NODE_RESTART, r, args, resp, s);
+}
+
+static struct plugin p1 = {
+	.name = "node.start",
+	.description = "start a node",
+	.type = PLUGIN_TYPE_API,
+	.api.cb = api_control_start
+};
+
+static struct plugin p2 = {
+	.name = "node.stop",
+	.description = "stop a node",
+	.type = PLUGIN_TYPE_API,
+	.api.cb = api_control_stop
+};
+
+static struct plugin p3 = {
+	.name = "node.pause",
+	.description = "pause a node",
+	.type = PLUGIN_TYPE_API,
+	.api.cb = api_control_pause
+};
+
+static struct plugin p4 = {
+	.name = "node.resume",
+	.description = "resume a node",
+	.type = PLUGIN_TYPE_API,
+	.api.cb = api_control_resume
+};
+
+static struct plugin p5 = {
+	.name = "node.restart",
+	.description = "restart a node",
+	.type = PLUGIN_TYPE_API,
+	.api.cb = api_control_restart
+};
+
+REGISTER_PLUGIN(&p1)
+REGISTER_PLUGIN(&p2)
+REGISTER_PLUGIN(&p3)
+REGISTER_PLUGIN(&p4)
+REGISTER_PLUGIN(&p5)